diff options
Diffstat (limited to 'drivers/firmware/efi')
33 files changed, 3032 insertions, 1362 deletions
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index ecc83e2f032c..613828d3f106 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -239,6 +239,11 @@ config EFI_DISABLE_PCI_DMA endmenu +config EFI_EMBEDDED_FIRMWARE + bool + depends on EFI + select CRYPTO_LIB_SHA256 + config UEFI_CPER bool diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index 554d795270d9..7a216984552b 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -13,19 +13,21 @@ KASAN_SANITIZE_runtime-wrappers.o := n obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o tpm.o obj-$(CONFIG_EFI) += capsule.o memmap.o +obj-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdtparams.o obj-$(CONFIG_EFI_VARS) += efivars.o obj-$(CONFIG_EFI_ESRT) += esrt.o obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o obj-$(CONFIG_UEFI_CPER) += cper.o obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o -obj-$(CONFIG_EFI_STUB) += libstub/ +subdir-$(CONFIG_EFI_STUB) += libstub obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_map.o obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o obj-$(CONFIG_EFI_TEST) += test/ obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o +obj-$(CONFIG_EFI_EMBEDDED_FIRMWARE) += embedded-firmware.o fake_map-y += fake_mem.o fake_map-$(CONFIG_X86) += x86_fake_mem.o diff --git a/drivers/firmware/efi/apple-properties.c b/drivers/firmware/efi/apple-properties.c index 5ccf39986a14..34f53d898acb 100644 --- a/drivers/firmware/efi/apple-properties.c +++ b/drivers/firmware/efi/apple-properties.c @@ -31,7 +31,7 @@ __setup("dump_apple_properties", dump_properties_enable); struct dev_header { u32 len; u32 prop_count; - struct efi_dev_path path[0]; + struct efi_dev_path path[]; /* * followed by key/value pairs, each key and value preceded by u32 len, * len includes itself, value may be empty (in which case its len is 4) @@ -42,11 +42,11 @@ struct properties_header { u32 len; u32 version; u32 dev_count; - struct dev_header dev_header[0]; + struct dev_header dev_header[]; }; static void __init unmarshal_key_value_pairs(struct dev_header *dev_header, - struct device *dev, void *ptr, + struct device *dev, const void *ptr, struct property_entry entry[]) { int i; @@ -117,10 +117,10 @@ static int __init unmarshal_devices(struct properties_header *properties) while (offset + sizeof(struct dev_header) < properties->len) { struct dev_header *dev_header = (void *)properties + offset; struct property_entry *entry = NULL; + const struct efi_dev_path *ptr; struct device *dev; size_t len; int ret, i; - void *ptr; if (offset + dev_header->len > properties->len || dev_header->len <= sizeof(*dev_header)) { @@ -131,10 +131,10 @@ static int __init unmarshal_devices(struct properties_header *properties) ptr = dev_header->path; len = dev_header->len - sizeof(*dev_header); - dev = efi_get_device_by_path((struct efi_dev_path **)&ptr, &len); + dev = efi_get_device_by_path(&ptr, &len); if (IS_ERR(dev)) { pr_err("device path parse error %ld at %#zx:\n", - PTR_ERR(dev), ptr - (void *)dev_header); + PTR_ERR(dev), (void *)ptr - (void *)dev_header); print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET, 16, 1, dev_header, dev_header->len, true); dev = NULL; diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c index d99f5b0c8a09..9e5e62f5f94d 100644 --- a/drivers/firmware/efi/arm-init.c +++ b/drivers/firmware/efi/arm-init.c @@ -22,8 +22,6 @@ #include <asm/efi.h> -u64 efi_system_table; - static int __init is_memory(efi_memory_desc_t *md) { if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC)) @@ -36,7 +34,7 @@ static int __init is_memory(efi_memory_desc_t *md) * as some data members of the EFI system table are virtually remapped after * SetVirtualAddressMap() has been called. */ -static phys_addr_t efi_to_phys(unsigned long addr) +static phys_addr_t __init efi_to_phys(unsigned long addr) { efi_memory_desc_t *md; @@ -55,7 +53,7 @@ static phys_addr_t efi_to_phys(unsigned long addr) static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR; -static __initdata efi_config_table_type_t arch_tables[] = { +static const efi_config_table_type_t arch_tables[] __initconst = { {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table}, {NULL_GUID, NULL, NULL} }; @@ -83,17 +81,15 @@ static void __init init_screen_info(void) memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size); } -static int __init uefi_init(void) +static int __init uefi_init(u64 efi_system_table) { - efi_char16_t *c16; - void *config_tables; + efi_config_table_t *config_tables; + efi_system_table_t *systab; size_t table_size; - char vendor[100] = "unknown"; - int i, retval; + int retval; - efi.systab = early_memremap_ro(efi_system_table, - sizeof(efi_system_table_t)); - if (efi.systab == NULL) { + systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t)); + if (systab == NULL) { pr_warn("Unable to map EFI system table.\n"); return -ENOMEM; } @@ -102,53 +98,29 @@ static int __init uefi_init(void) if (IS_ENABLED(CONFIG_64BIT)) set_bit(EFI_64BIT, &efi.flags); - /* - * Verify the EFI Table - */ - if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { - pr_err("System table signature incorrect\n"); - retval = -EINVAL; + retval = efi_systab_check_header(&systab->hdr, 2); + if (retval) goto out; - } - if ((efi.systab->hdr.revision >> 16) < 2) - pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n", - efi.systab->hdr.revision >> 16, - efi.systab->hdr.revision & 0xffff); - - efi.runtime_version = efi.systab->hdr.revision; - - /* Show what we know for posterity */ - c16 = early_memremap_ro(efi_to_phys(efi.systab->fw_vendor), - sizeof(vendor) * sizeof(efi_char16_t)); - if (c16) { - for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) - vendor[i] = c16[i]; - vendor[i] = '\0'; - early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); - } - pr_info("EFI v%u.%.02u by %s\n", - efi.systab->hdr.revision >> 16, - efi.systab->hdr.revision & 0xffff, vendor); + efi.runtime = systab->runtime; + efi.runtime_version = systab->hdr.revision; - table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables; - config_tables = early_memremap_ro(efi_to_phys(efi.systab->tables), + efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor)); + + table_size = sizeof(efi_config_table_t) * systab->nr_tables; + config_tables = early_memremap_ro(efi_to_phys(systab->tables), table_size); if (config_tables == NULL) { pr_warn("Unable to map EFI config table array.\n"); retval = -ENOMEM; goto out; } - retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables, - sizeof(efi_config_table_t), + retval = efi_config_parse_tables(config_tables, systab->nr_tables, arch_tables); - if (!retval) - efi.config_table = (unsigned long)efi.systab->tables; - early_memunmap(config_tables, table_size); out: - early_memunmap(efi.systab, sizeof(efi_system_table_t)); + early_memunmap(systab, sizeof(efi_system_table_t)); return retval; } @@ -233,19 +205,13 @@ static __init void reserve_regions(void) void __init efi_init(void) { struct efi_memory_map_data data; - struct efi_fdt_params params; + u64 efi_system_table; /* Grab UEFI information placed in FDT by stub */ - if (!efi_get_fdt_params(¶ms)) + efi_system_table = efi_get_fdt_params(&data); + if (!efi_system_table) return; - efi_system_table = params.system_table; - - data.desc_version = params.desc_ver; - data.desc_size = params.desc_size; - data.size = params.mmap_size; - data.phys_map = params.mmap; - if (efi_memmap_init_early(&data) < 0) { /* * If we are booting via UEFI, the UEFI memory map is the only @@ -259,7 +225,7 @@ void __init efi_init(void) "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", efi.memmap.desc_version); - if (uefi_init() < 0) { + if (uefi_init(efi_system_table) < 0) { efi_memmap_unmap(); return; } @@ -267,9 +233,8 @@ void __init efi_init(void) reserve_regions(); efi_esrt_init(); - memblock_reserve(params.mmap & PAGE_MASK, - PAGE_ALIGN(params.mmap_size + - (params.mmap & ~PAGE_MASK))); + memblock_reserve(data.phys_map & PAGE_MASK, + PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK))); init_screen_info(); @@ -349,7 +314,7 @@ static int efifb_add_links(const struct fwnode_handle *fwnode, * If this fails, retrying this function at a later point won't * change anything. So, don't return an error after this. */ - if (!device_link_add(dev, sup_dev, 0)) + if (!device_link_add(dev, sup_dev, fw_devlink_get_flags())) dev_warn(dev, "device_link_add() failed\n"); put_device(sup_dev); diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c index 9dda2602c862..b876373f2297 100644 --- a/drivers/firmware/efi/arm-runtime.c +++ b/drivers/firmware/efi/arm-runtime.c @@ -25,8 +25,6 @@ #include <asm/pgalloc.h> #include <asm/pgtable.h> -extern u64 efi_system_table; - #if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64) #include <asm/ptdump.h> @@ -54,13 +52,11 @@ device_initcall(ptdump_init); static bool __init efi_virtmap_init(void) { efi_memory_desc_t *md; - bool systab_found; efi_mm.pgd = pgd_alloc(&efi_mm); mm_init_cpumask(&efi_mm); init_new_context(NULL, &efi_mm); - systab_found = false; for_each_efi_memory_desc(md) { phys_addr_t phys = md->phys_addr; int ret; @@ -76,20 +72,6 @@ static bool __init efi_virtmap_init(void) &phys, ret); return false; } - /* - * If this entry covers the address of the UEFI system table, - * calculate and record its virtual address. - */ - if (efi_system_table >= phys && - efi_system_table < phys + (md->num_pages * EFI_PAGE_SIZE)) { - efi.systab = (void *)(unsigned long)(efi_system_table - - phys + md->virt_addr); - systab_found = true; - } - } - if (!systab_found) { - pr_err("No virtual mapping found for the UEFI System Table\n"); - return false; } if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions)) diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c index d3067cbd5114..4dde8edd53b6 100644 --- a/drivers/firmware/efi/capsule-loader.c +++ b/drivers/firmware/efi/capsule-loader.c @@ -168,7 +168,7 @@ static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info) static ssize_t efi_capsule_write(struct file *file, const char __user *buff, size_t count, loff_t *offp) { - int ret = 0; + int ret; struct capsule_info *cap_info = file->private_data; struct page *page; void *kbuff = NULL; diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c index 20123384271c..5c9625e552f4 100644 --- a/drivers/firmware/efi/dev-path-parser.c +++ b/drivers/firmware/efi/dev-path-parser.c @@ -31,13 +31,13 @@ static int __init match_acpi_dev(struct device *dev, const void *data) return !strcmp("0", hid_uid.uid); } -static long __init parse_acpi_path(struct efi_dev_path *node, +static long __init parse_acpi_path(const struct efi_dev_path *node, struct device *parent, struct device **child) { struct acpi_hid_uid hid_uid = {}; struct device *phys_dev; - if (node->length != 12) + if (node->header.length != 12) return -EINVAL; sprintf(hid_uid.hid[0].id, "%c%c%c%04X", @@ -69,12 +69,12 @@ static int __init match_pci_dev(struct device *dev, void *data) return dev_is_pci(dev) && to_pci_dev(dev)->devfn == devfn; } -static long __init parse_pci_path(struct efi_dev_path *node, +static long __init parse_pci_path(const struct efi_dev_path *node, struct device *parent, struct device **child) { unsigned int devfn; - if (node->length != 6) + if (node->header.length != 6) return -EINVAL; if (!parent) return -EINVAL; @@ -105,19 +105,19 @@ static long __init parse_pci_path(struct efi_dev_path *node, * search for a device. */ -static long __init parse_end_path(struct efi_dev_path *node, +static long __init parse_end_path(const struct efi_dev_path *node, struct device *parent, struct device **child) { - if (node->length != 4) + if (node->header.length != 4) return -EINVAL; - if (node->sub_type != EFI_DEV_END_INSTANCE && - node->sub_type != EFI_DEV_END_ENTIRE) + if (node->header.sub_type != EFI_DEV_END_INSTANCE && + node->header.sub_type != EFI_DEV_END_ENTIRE) return -EINVAL; if (!parent) return -ENODEV; *child = get_device(parent); - return node->sub_type; + return node->header.sub_type; } /** @@ -156,7 +156,7 @@ static long __init parse_end_path(struct efi_dev_path *node, * %ERR_PTR(-EINVAL) if a node is malformed or exceeds @len, * %ERR_PTR(-ENOTSUPP) if support for a node type is not yet implemented. */ -struct device * __init efi_get_device_by_path(struct efi_dev_path **node, +struct device * __init efi_get_device_by_path(const struct efi_dev_path **node, size_t *len) { struct device *parent = NULL, *child; @@ -166,16 +166,16 @@ struct device * __init efi_get_device_by_path(struct efi_dev_path **node, return NULL; while (!ret) { - if (*len < 4 || *len < (*node)->length) + if (*len < 4 || *len < (*node)->header.length) ret = -EINVAL; - else if ((*node)->type == EFI_DEV_ACPI && - (*node)->sub_type == EFI_DEV_BASIC_ACPI) + else if ((*node)->header.type == EFI_DEV_ACPI && + (*node)->header.sub_type == EFI_DEV_BASIC_ACPI) ret = parse_acpi_path(*node, parent, &child); - else if ((*node)->type == EFI_DEV_HW && - (*node)->sub_type == EFI_DEV_PCI) + else if ((*node)->header.type == EFI_DEV_HW && + (*node)->header.sub_type == EFI_DEV_PCI) ret = parse_pci_path(*node, parent, &child); - else if (((*node)->type == EFI_DEV_END_PATH || - (*node)->type == EFI_DEV_END_PATH2)) + else if (((*node)->header.type == EFI_DEV_END_PATH || + (*node)->header.type == EFI_DEV_END_PATH2)) ret = parse_end_path(*node, parent, &child); else ret = -ENOTSUPP; @@ -185,8 +185,8 @@ struct device * __init efi_get_device_by_path(struct efi_dev_path **node, return ERR_PTR(ret); parent = child; - *node = (void *)*node + (*node)->length; - *len -= (*node)->length; + *node = (void *)*node + (*node)->header.length; + *len -= (*node)->header.length; } if (ret == EFI_DEV_END_ENTIRE) diff --git a/drivers/firmware/efi/efi-bgrt.c b/drivers/firmware/efi/efi-bgrt.c index b07c17643210..6aafdb67dbca 100644 --- a/drivers/firmware/efi/efi-bgrt.c +++ b/drivers/firmware/efi/efi-bgrt.c @@ -42,7 +42,12 @@ void __init efi_bgrt_init(struct acpi_table_header *table) return; } *bgrt = *(struct acpi_table_bgrt *)table; - if (bgrt->version != 1) { + /* + * Only version 1 is defined but some older laptops (seen on Lenovo + * Ivy Bridge models) have a correct version 1 BGRT table with the + * version set to 0, so we accept version 0 and 1. + */ + if (bgrt->version > 1) { pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n", bgrt->version); goto out; diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c index 9ea13e8d12ec..c2f1d4e6630b 100644 --- a/drivers/firmware/efi/efi-pstore.c +++ b/drivers/firmware/efi/efi-pstore.c @@ -161,7 +161,7 @@ static int efi_pstore_scan_sysfs_exit(struct efivar_entry *pos, * * @record: pstore record to pass to callback * - * You MUST call efivar_enter_iter_begin() before this function, and + * You MUST call efivar_entry_iter_begin() before this function, and * efivar_entry_iter_end() afterwards. * */ @@ -356,7 +356,7 @@ static struct pstore_info efi_pstore_info = { static __init int efivars_pstore_init(void) { - if (!efi_enabled(EFI_RUNTIME_SERVICES)) + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) return 0; if (!efivars_kobject()) diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 21ea99f65113..911a2bd0f6b7 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -17,10 +17,10 @@ #include <linux/kobject.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/debugfs.h> #include <linux/device.h> #include <linux/efi.h> #include <linux/of.h> -#include <linux/of_fdt.h> #include <linux/io.h> #include <linux/kexec.h> #include <linux/platform_device.h> @@ -35,27 +35,21 @@ #include <asm/early_ioremap.h> struct efi __read_mostly efi = { - .mps = EFI_INVALID_TABLE_ADDR, + .runtime_supported_mask = EFI_RT_SUPPORTED_ALL, .acpi = EFI_INVALID_TABLE_ADDR, .acpi20 = EFI_INVALID_TABLE_ADDR, .smbios = EFI_INVALID_TABLE_ADDR, .smbios3 = EFI_INVALID_TABLE_ADDR, - .boot_info = EFI_INVALID_TABLE_ADDR, - .hcdp = EFI_INVALID_TABLE_ADDR, - .uga = EFI_INVALID_TABLE_ADDR, - .fw_vendor = EFI_INVALID_TABLE_ADDR, - .runtime = EFI_INVALID_TABLE_ADDR, - .config_table = EFI_INVALID_TABLE_ADDR, .esrt = EFI_INVALID_TABLE_ADDR, - .properties_table = EFI_INVALID_TABLE_ADDR, - .mem_attr_table = EFI_INVALID_TABLE_ADDR, - .rng_seed = EFI_INVALID_TABLE_ADDR, .tpm_log = EFI_INVALID_TABLE_ADDR, .tpm_final_log = EFI_INVALID_TABLE_ADDR, - .mem_reserve = EFI_INVALID_TABLE_ADDR, }; EXPORT_SYMBOL(efi); +unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR; +static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR; +static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR; + struct mm_struct efi_mm = { .mm_rb = RB_ROOT, .mm_users = ATOMIC_INIT(2), @@ -122,8 +116,6 @@ static ssize_t systab_show(struct kobject *kobj, if (!kobj || !buf) return -EINVAL; - if (efi.mps != EFI_INVALID_TABLE_ADDR) - str += sprintf(str, "MPS=0x%lx\n", efi.mps); if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); if (efi.acpi != EFI_INVALID_TABLE_ADDR) @@ -137,30 +129,17 @@ static ssize_t systab_show(struct kobject *kobj, str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3); if (efi.smbios != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); - if (efi.hcdp != EFI_INVALID_TABLE_ADDR) - str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); - if (efi.boot_info != EFI_INVALID_TABLE_ADDR) - str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); - if (efi.uga != EFI_INVALID_TABLE_ADDR) - str += sprintf(str, "UGA=0x%lx\n", efi.uga); - - return str - buf; -} -static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400); + if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86)) { + extern char *efi_systab_show_arch(char *str); -#define EFI_FIELD(var) efi.var + str = efi_systab_show_arch(str); + } -#define EFI_ATTR_SHOW(name) \ -static ssize_t name##_show(struct kobject *kobj, \ - struct kobj_attribute *attr, char *buf) \ -{ \ - return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \ + return str - buf; } -EFI_ATTR_SHOW(fw_vendor); -EFI_ATTR_SHOW(runtime); -EFI_ATTR_SHOW(config_table); +static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400); static ssize_t fw_platform_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -168,36 +147,24 @@ static ssize_t fw_platform_size_show(struct kobject *kobj, return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32); } -static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor); -static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime); -static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table); +extern __weak struct kobj_attribute efi_attr_fw_vendor; +extern __weak struct kobj_attribute efi_attr_runtime; +extern __weak struct kobj_attribute efi_attr_config_table; static struct kobj_attribute efi_attr_fw_platform_size = __ATTR_RO(fw_platform_size); static struct attribute *efi_subsys_attrs[] = { &efi_attr_systab.attr, + &efi_attr_fw_platform_size.attr, &efi_attr_fw_vendor.attr, &efi_attr_runtime.attr, &efi_attr_config_table.attr, - &efi_attr_fw_platform_size.attr, NULL, }; -static umode_t efi_attr_is_visible(struct kobject *kobj, - struct attribute *attr, int n) +umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, + int n) { - if (attr == &efi_attr_fw_vendor.attr) { - if (efi_enabled(EFI_PARAVIRT) || - efi.fw_vendor == EFI_INVALID_TABLE_ADDR) - return 0; - } else if (attr == &efi_attr_runtime.attr) { - if (efi.runtime == EFI_INVALID_TABLE_ADDR) - return 0; - } else if (attr == &efi_attr_config_table.attr) { - if (efi.config_table == EFI_INVALID_TABLE_ADDR) - return 0; - } - return attr->mode; } @@ -325,6 +292,59 @@ free_entry: static inline int efivar_ssdt_load(void) { return 0; } #endif +#ifdef CONFIG_DEBUG_FS + +#define EFI_DEBUGFS_MAX_BLOBS 32 + +static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS]; + +static void __init efi_debugfs_init(void) +{ + struct dentry *efi_debugfs; + efi_memory_desc_t *md; + char name[32]; + int type_count[EFI_BOOT_SERVICES_DATA + 1] = {}; + int i = 0; + + efi_debugfs = debugfs_create_dir("efi", NULL); + if (IS_ERR_OR_NULL(efi_debugfs)) + return; + + for_each_efi_memory_desc(md) { + switch (md->type) { + case EFI_BOOT_SERVICES_CODE: + snprintf(name, sizeof(name), "boot_services_code%d", + type_count[md->type]++); + break; + case EFI_BOOT_SERVICES_DATA: + snprintf(name, sizeof(name), "boot_services_data%d", + type_count[md->type]++); + break; + default: + continue; + } + + if (i >= EFI_DEBUGFS_MAX_BLOBS) { + pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n", + EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS); + break; + } + + debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT; + debugfs_blob[i].data = memremap(md->phys_addr, + debugfs_blob[i].size, + MEMREMAP_WB); + if (!debugfs_blob[i].data) + continue; + + debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]); + i++; + } +} +#else +static inline void efi_debugfs_init(void) {} +#endif + /* * We register the efi subsystem with the firmware subsystem and the * efivars subsystem with the efi subsystem, if the system was booted with @@ -334,21 +354,30 @@ static int __init efisubsys_init(void) { int error; + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + efi.runtime_supported_mask = 0; + if (!efi_enabled(EFI_BOOT)) return 0; - /* - * Since we process only one efi_runtime_service() at a time, an - * ordered workqueue (which creates only one execution context) - * should suffice all our needs. - */ - efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0); - if (!efi_rts_wq) { - pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n"); - clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); - return 0; + if (efi.runtime_supported_mask) { + /* + * Since we process only one efi_runtime_service() at a time, an + * ordered workqueue (which creates only one execution context) + * should suffice for all our needs. + */ + efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0); + if (!efi_rts_wq) { + pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n"); + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + efi.runtime_supported_mask = 0; + return 0; + } } + if (efi_rt_services_supported(EFI_RT_SUPPORTED_TIME_SERVICES)) + platform_device_register_simple("rtc-efi", 0, NULL, 0); + /* We register the efi directory at /sys/firmware/efi */ efi_kobj = kobject_create_and_add("efi", firmware_kobj); if (!efi_kobj) { @@ -356,12 +385,13 @@ static int __init efisubsys_init(void) return -ENOMEM; } - error = generic_ops_register(); - if (error) - goto err_put; - - if (efi_enabled(EFI_RUNTIME_SERVICES)) + if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) { efivar_ssdt_load(); + error = generic_ops_register(); + if (error) + goto err_put; + platform_device_register_simple("efivars", 0, NULL, 0); + } error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); if (error) { @@ -381,12 +411,16 @@ static int __init efisubsys_init(void) goto err_remove_group; } + if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS)) + efi_debugfs_init(); + return 0; err_remove_group: sysfs_remove_group(efi_kobj, &efi_subsys_attr_group); err_unregister: - generic_ops_unregister(); + if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) + generic_ops_unregister(); err_put: kobject_put(efi_kobj); return error; @@ -467,30 +501,27 @@ void __init efi_mem_reserve(phys_addr_t addr, u64 size) efi_arch_mem_reserve(addr, size); } -static __initdata efi_config_table_type_t common_tables[] = { +static const efi_config_table_type_t common_tables[] __initconst = { {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20}, {ACPI_TABLE_GUID, "ACPI", &efi.acpi}, - {HCDP_TABLE_GUID, "HCDP", &efi.hcdp}, - {MPS_TABLE_GUID, "MPS", &efi.mps}, {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios}, {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3}, - {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga}, {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt}, - {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table}, - {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table}, - {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed}, + {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi_mem_attr_table}, + {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi_rng_seed}, {LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log}, {LINUX_EFI_TPM_FINAL_LOG_GUID, "TPMFinalLog", &efi.tpm_final_log}, - {LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &efi.mem_reserve}, + {LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &mem_reserve}, + {EFI_RT_PROPERTIES_TABLE_GUID, "RTPROP", &rt_prop}, #ifdef CONFIG_EFI_RCI2_TABLE {DELLEMC_EFI_RCI2_TABLE_GUID, NULL, &rci2_table_phys}, #endif {NULL_GUID, NULL, NULL}, }; -static __init int match_config_table(efi_guid_t *guid, +static __init int match_config_table(const efi_guid_t *guid, unsigned long table, - efi_config_table_type_t *table_types) + const efi_config_table_type_t *table_types) { int i; @@ -509,48 +540,47 @@ static __init int match_config_table(efi_guid_t *guid, return 0; } -int __init efi_config_parse_tables(void *config_tables, int count, int sz, - efi_config_table_type_t *arch_tables) +int __init efi_config_parse_tables(const efi_config_table_t *config_tables, + int count, + const efi_config_table_type_t *arch_tables) { - void *tablep; + const efi_config_table_64_t *tbl64 = (void *)config_tables; + const efi_config_table_32_t *tbl32 = (void *)config_tables; + const efi_guid_t *guid; + unsigned long table; int i; - tablep = config_tables; pr_info(""); for (i = 0; i < count; i++) { - efi_guid_t guid; - unsigned long table; - - if (efi_enabled(EFI_64BIT)) { - u64 table64; - guid = ((efi_config_table_64_t *)tablep)->guid; - table64 = ((efi_config_table_64_t *)tablep)->table; - table = table64; -#ifndef CONFIG_64BIT - if (table64 >> 32) { + if (!IS_ENABLED(CONFIG_X86)) { + guid = &config_tables[i].guid; + table = (unsigned long)config_tables[i].table; + } else if (efi_enabled(EFI_64BIT)) { + guid = &tbl64[i].guid; + table = tbl64[i].table; + + if (IS_ENABLED(CONFIG_X86_32) && + tbl64[i].table > U32_MAX) { pr_cont("\n"); pr_err("Table located above 4GB, disabling EFI.\n"); return -EINVAL; } -#endif } else { - guid = ((efi_config_table_32_t *)tablep)->guid; - table = ((efi_config_table_32_t *)tablep)->table; + guid = &tbl32[i].guid; + table = tbl32[i].table; } - if (!match_config_table(&guid, table, common_tables)) - match_config_table(&guid, table, arch_tables); - - tablep += sz; + if (!match_config_table(guid, table, common_tables)) + match_config_table(guid, table, arch_tables); } pr_cont("\n"); set_bit(EFI_CONFIG_TABLES, &efi.flags); - if (efi.rng_seed != EFI_INVALID_TABLE_ADDR) { + if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) { struct linux_efi_random_seed *seed; u32 size = 0; - seed = early_memremap(efi.rng_seed, sizeof(*seed)); + seed = early_memremap(efi_rng_seed, sizeof(*seed)); if (seed != NULL) { size = READ_ONCE(seed->size); early_memunmap(seed, sizeof(*seed)); @@ -558,7 +588,7 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, pr_err("Could not map UEFI random seed!\n"); } if (size > 0) { - seed = early_memremap(efi.rng_seed, + seed = early_memremap(efi_rng_seed, sizeof(*seed) + size); if (seed != NULL) { pr_notice("seeding entropy pool\n"); @@ -570,35 +600,17 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, } } - if (efi_enabled(EFI_MEMMAP)) + if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP)) efi_memattr_init(); efi_tpm_eventlog_init(); - /* Parse the EFI Properties table if it exists */ - if (efi.properties_table != EFI_INVALID_TABLE_ADDR) { - efi_properties_table_t *tbl; - - tbl = early_memremap(efi.properties_table, sizeof(*tbl)); - if (tbl == NULL) { - pr_err("Could not map Properties table!\n"); - return -ENOMEM; - } - - if (tbl->memory_protection_attribute & - EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) - set_bit(EFI_NX_PE_DATA, &efi.flags); - - early_memunmap(tbl, sizeof(*tbl)); - } - - if (efi.mem_reserve != EFI_INVALID_TABLE_ADDR) { - unsigned long prsv = efi.mem_reserve; + if (mem_reserve != EFI_INVALID_TABLE_ADDR) { + unsigned long prsv = mem_reserve; while (prsv) { struct linux_efi_memreserve *rsv; u8 *p; - int i; /* * Just map a full page: that is what we will get @@ -627,186 +639,78 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz, } } - return 0; -} - -int __init efi_config_init(efi_config_table_type_t *arch_tables) -{ - void *config_tables; - int sz, ret; - - if (efi.systab->nr_tables == 0) - return 0; - - if (efi_enabled(EFI_64BIT)) - sz = sizeof(efi_config_table_64_t); - else - sz = sizeof(efi_config_table_32_t); + if (rt_prop != EFI_INVALID_TABLE_ADDR) { + efi_rt_properties_table_t *tbl; - /* - * Let's see what config tables the firmware passed to us. - */ - config_tables = early_memremap(efi.systab->tables, - efi.systab->nr_tables * sz); - if (config_tables == NULL) { - pr_err("Could not map Configuration table!\n"); - return -ENOMEM; + tbl = early_memremap(rt_prop, sizeof(*tbl)); + if (tbl) { + efi.runtime_supported_mask &= tbl->runtime_services_supported; + early_memunmap(tbl, sizeof(*tbl)); + } } - ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz, - arch_tables); - - early_memunmap(config_tables, efi.systab->nr_tables * sz); - return ret; + return 0; } -#ifdef CONFIG_EFI_VARS_MODULE -static int __init efi_load_efivars(void) +int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr, + int min_major_version) { - struct platform_device *pdev; - - if (!efi_enabled(EFI_RUNTIME_SERVICES)) - return 0; - - pdev = platform_device_register_simple("efivars", 0, NULL, 0); - return PTR_ERR_OR_ZERO(pdev); -} -device_initcall(efi_load_efivars); -#endif - -#ifdef CONFIG_EFI_PARAMS_FROM_FDT - -#define UEFI_PARAM(name, prop, field) \ - { \ - { name }, \ - { prop }, \ - offsetof(struct efi_fdt_params, field), \ - sizeof_field(struct efi_fdt_params, field) \ + if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) { + pr_err("System table signature incorrect!\n"); + return -EINVAL; } -struct params { - const char name[32]; - const char propname[32]; - int offset; - int size; -}; - -static __initdata struct params fdt_params[] = { - UEFI_PARAM("System Table", "linux,uefi-system-table", system_table), - UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap), - UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size), - UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size), - UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) -}; + if ((systab_hdr->revision >> 16) < min_major_version) + pr_err("Warning: System table version %d.%02d, expected %d.00 or greater!\n", + systab_hdr->revision >> 16, + systab_hdr->revision & 0xffff, + min_major_version); -static __initdata struct params xen_fdt_params[] = { - UEFI_PARAM("System Table", "xen,uefi-system-table", system_table), - UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap), - UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size), - UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size), - UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver) -}; - -#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) - -static __initdata struct { - const char *uname; - const char *subnode; - struct params *params; -} dt_params[] = { - { "hypervisor", "uefi", xen_fdt_params }, - { "chosen", NULL, fdt_params }, -}; - -struct param_info { - int found; - void *params; - const char *missing; -}; + return 0; +} -static int __init __find_uefi_params(unsigned long node, - struct param_info *info, - struct params *params) +#ifndef CONFIG_IA64 +static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor, + size_t size) { - const void *prop; - void *dest; - u64 val; - int i, len; - - for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { - prop = of_get_flat_dt_prop(node, params[i].propname, &len); - if (!prop) { - info->missing = params[i].name; - return 0; - } + const efi_char16_t *ret; - dest = info->params + params[i].offset; - info->found++; - - val = of_read_number(prop, len / sizeof(u32)); - - if (params[i].size == sizeof(u32)) - *(u32 *)dest = val; - else - *(u64 *)dest = val; - - if (efi_enabled(EFI_DBG)) - pr_info(" %s: 0x%0*llx\n", params[i].name, - params[i].size * 2, val); - } - - return 1; + ret = early_memremap_ro(fw_vendor, size); + if (!ret) + pr_err("Could not map the firmware vendor!\n"); + return ret; } -static int __init fdt_find_uefi_params(unsigned long node, const char *uname, - int depth, void *data) +static void __init unmap_fw_vendor(const void *fw_vendor, size_t size) { - struct param_info *info = data; - int i; - - for (i = 0; i < ARRAY_SIZE(dt_params); i++) { - const char *subnode = dt_params[i].subnode; - - if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { - info->missing = dt_params[i].params[0].name; - continue; - } - - if (subnode) { - int err = of_get_flat_dt_subnode_by_name(node, subnode); - - if (err < 0) - return 0; - - node = err; - } - - return __find_uefi_params(node, info, dt_params[i].params); - } - - return 0; + early_memunmap((void *)fw_vendor, size); } +#else +#define map_fw_vendor(p, s) __va(p) +#define unmap_fw_vendor(v, s) +#endif -int __init efi_get_fdt_params(struct efi_fdt_params *params) +void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr, + unsigned long fw_vendor) { - struct param_info info; - int ret; + char vendor[100] = "unknown"; + const efi_char16_t *c16; + size_t i; - pr_info("Getting EFI parameters from FDT:\n"); + c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t)); + if (c16) { + for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i) + vendor[i] = c16[i]; + vendor[i] = '\0'; - info.found = 0; - info.params = params; - - ret = of_scan_flat_dt(fdt_find_uefi_params, &info); - if (!info.found) - pr_info("UEFI not found.\n"); - else if (!ret) - pr_err("Can't find '%s' in device tree!\n", - info.missing); + unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t)); + } - return ret; + pr_info("EFI v%u.%.02u by %s\n", + systab_hdr->revision >> 16, + systab_hdr->revision & 0xffff, + vendor); } -#endif /* CONFIG_EFI_PARAMS_FROM_FDT */ static __initdata char memory_type_name[][20] = { "Reserved", @@ -968,10 +872,10 @@ static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init; static int __init efi_memreserve_map_root(void) { - if (efi.mem_reserve == EFI_INVALID_TABLE_ADDR) + if (mem_reserve == EFI_INVALID_TABLE_ADDR) return -ENODEV; - efi_memreserve_root = memremap(efi.mem_reserve, + efi_memreserve_root = memremap(mem_reserve, sizeof(*efi_memreserve_root), MEMREMAP_WB); if (WARN_ON_ONCE(!efi_memreserve_root)) @@ -1076,7 +980,7 @@ static int update_efi_random_seed(struct notifier_block *nb, if (!kexec_in_progress) return NOTIFY_DONE; - seed = memremap(efi.rng_seed, sizeof(*seed), MEMREMAP_WB); + seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB); if (seed != NULL) { size = min(seed->size, EFI_RANDOM_SEED_SIZE); memunmap(seed); @@ -1084,7 +988,7 @@ static int update_efi_random_seed(struct notifier_block *nb, pr_err("Could not map UEFI random seed!\n"); } if (size > 0) { - seed = memremap(efi.rng_seed, sizeof(*seed) + size, + seed = memremap(efi_rng_seed, sizeof(*seed) + size, MEMREMAP_WB); if (seed != NULL) { seed->size = size; @@ -1101,9 +1005,9 @@ static struct notifier_block efi_random_seed_nb = { .notifier_call = update_efi_random_seed, }; -static int register_update_efi_random_seed(void) +static int __init register_update_efi_random_seed(void) { - if (efi.rng_seed == EFI_INVALID_TABLE_ADDR) + if (efi_rng_seed == EFI_INVALID_TABLE_ADDR) return 0; return register_reboot_notifier(&efi_random_seed_nb); } diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c index 7576450c8254..78ad1ba8c987 100644 --- a/drivers/firmware/efi/efivars.c +++ b/drivers/firmware/efi/efivars.c @@ -83,13 +83,16 @@ static ssize_t efivar_attr_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; + unsigned long size = sizeof(var->Data); char *str = buf; + int ret; if (!entry || !buf) return -EINVAL; - var->DataSize = 1024; - if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) + ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data); + var->DataSize = size; + if (ret) return -EIO; if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) @@ -116,13 +119,16 @@ static ssize_t efivar_size_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; + unsigned long size = sizeof(var->Data); char *str = buf; + int ret; if (!entry || !buf) return -EINVAL; - var->DataSize = 1024; - if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) + ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data); + var->DataSize = size; + if (ret) return -EIO; str += sprintf(str, "0x%lx\n", var->DataSize); @@ -133,12 +139,15 @@ static ssize_t efivar_data_read(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; + unsigned long size = sizeof(var->Data); + int ret; if (!entry || !buf) return -EINVAL; - var->DataSize = 1024; - if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) + ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data); + var->DataSize = size; + if (ret) return -EIO; memcpy(buf, var->Data, var->DataSize); @@ -199,6 +208,9 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) u8 *data; int err; + if (!entry || !buf) + return -EINVAL; + if (in_compat_syscall()) { struct compat_efi_variable *compat; @@ -250,14 +262,16 @@ efivar_show_raw(struct efivar_entry *entry, char *buf) { struct efi_variable *var = &entry->var; struct compat_efi_variable *compat; + unsigned long datasize = sizeof(var->Data); size_t size; + int ret; if (!entry || !buf) return 0; - var->DataSize = 1024; - if (efivar_entry_get(entry, &entry->var.Attributes, - &entry->var.DataSize, entry->var.Data)) + ret = efivar_entry_get(entry, &var->Attributes, &datasize, var->Data); + var->DataSize = datasize; + if (ret) return -EIO; if (in_compat_syscall()) { @@ -664,7 +678,7 @@ int efivars_sysfs_init(void) struct kobject *parent_kobj = efivars_kobject(); int error = 0; - if (!efi_enabled(EFI_RUNTIME_SERVICES)) + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) return -ENODEV; /* No efivars has been registered yet */ diff --git a/drivers/firmware/efi/embedded-firmware.c b/drivers/firmware/efi/embedded-firmware.c new file mode 100644 index 000000000000..a1b199de9006 --- /dev/null +++ b/drivers/firmware/efi/embedded-firmware.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for extracting embedded firmware for peripherals from EFI code, + * + * Copyright (c) 2018 Hans de Goede <hdegoede@redhat.com> + */ + +#include <linux/dmi.h> +#include <linux/efi.h> +#include <linux/efi_embedded_fw.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/vmalloc.h> +#include <crypto/sha.h> + +/* Exported for use by lib/test_firmware.c only */ +LIST_HEAD(efi_embedded_fw_list); +EXPORT_SYMBOL_GPL(efi_embedded_fw_list); + +static bool checked_for_fw; + +static const struct dmi_system_id * const embedded_fw_table[] = { +#ifdef CONFIG_TOUCHSCREEN_DMI + touchscreen_dmi_table, +#endif + NULL +}; + +/* + * Note the efi_check_for_embedded_firmwares() code currently makes the + * following 2 assumptions. This may needs to be revisited if embedded firmware + * is found where this is not true: + * 1) The firmware is only found in EFI_BOOT_SERVICES_CODE memory segments + * 2) The firmware always starts at an offset which is a multiple of 8 bytes + */ +static int __init efi_check_md_for_embedded_firmware( + efi_memory_desc_t *md, const struct efi_embedded_fw_desc *desc) +{ + struct sha256_state sctx; + struct efi_embedded_fw *fw; + u8 sha256[32]; + u64 i, size; + u8 *map; + + size = md->num_pages << EFI_PAGE_SHIFT; + map = memremap(md->phys_addr, size, MEMREMAP_WB); + if (!map) { + pr_err("Error mapping EFI mem at %#llx\n", md->phys_addr); + return -ENOMEM; + } + + for (i = 0; (i + desc->length) <= size; i += 8) { + if (memcmp(map + i, desc->prefix, EFI_EMBEDDED_FW_PREFIX_LEN)) + continue; + + sha256_init(&sctx); + sha256_update(&sctx, map + i, desc->length); + sha256_final(&sctx, sha256); + if (memcmp(sha256, desc->sha256, 32) == 0) + break; + } + if ((i + desc->length) > size) { + memunmap(map); + return -ENOENT; + } + + pr_info("Found EFI embedded fw '%s'\n", desc->name); + + fw = kmalloc(sizeof(*fw), GFP_KERNEL); + if (!fw) { + memunmap(map); + return -ENOMEM; + } + + fw->data = kmemdup(map + i, desc->length, GFP_KERNEL); + memunmap(map); + if (!fw->data) { + kfree(fw); + return -ENOMEM; + } + + fw->name = desc->name; + fw->length = desc->length; + list_add(&fw->list, &efi_embedded_fw_list); + + return 0; +} + +void __init efi_check_for_embedded_firmwares(void) +{ + const struct efi_embedded_fw_desc *fw_desc; + const struct dmi_system_id *dmi_id; + efi_memory_desc_t *md; + int i, r; + + for (i = 0; embedded_fw_table[i]; i++) { + dmi_id = dmi_first_match(embedded_fw_table[i]); + if (!dmi_id) + continue; + + fw_desc = dmi_id->driver_data; + + /* + * In some drivers the struct driver_data contains may contain + * other driver specific data after the fw_desc struct; and + * the fw_desc struct itself may be empty, skip these. + */ + if (!fw_desc->name) + continue; + + for_each_efi_memory_desc(md) { + if (md->type != EFI_BOOT_SERVICES_CODE) + continue; + + r = efi_check_md_for_embedded_firmware(md, fw_desc); + if (r == 0) + break; + } + } + + checked_for_fw = true; +} + +int efi_get_embedded_fw(const char *name, const u8 **data, size_t *size) +{ + struct efi_embedded_fw *iter, *fw = NULL; + + if (!checked_for_fw) { + pr_warn("Warning %s called while we did not check for embedded fw\n", + __func__); + return -ENOENT; + } + + list_for_each_entry(iter, &efi_embedded_fw_list, list) { + if (strcmp(name, iter->name) == 0) { + fw = iter; + break; + } + } + + if (!fw) + return -ENOENT; + + *data = fw->data; + *size = fw->length; + + return 0; +} +EXPORT_SYMBOL_GPL(efi_get_embedded_fw); diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c index 2762e0662bf4..e3d692696583 100644 --- a/drivers/firmware/efi/esrt.c +++ b/drivers/firmware/efi/esrt.c @@ -240,7 +240,6 @@ void __init efi_esrt_init(void) { void *va; struct efi_system_resource_table tmpesrt; - struct efi_system_resource_entry_v1 *v1_entries; size_t size, max, entry_size, entries_size; efi_memory_desc_t md; int rc; @@ -288,14 +287,13 @@ void __init efi_esrt_init(void) memcpy(&tmpesrt, va, sizeof(tmpesrt)); early_memunmap(va, size); - if (tmpesrt.fw_resource_version == 1) { - entry_size = sizeof (*v1_entries); - } else { + if (tmpesrt.fw_resource_version != 1) { pr_err("Unsupported ESRT version %lld.\n", tmpesrt.fw_resource_version); return; } + entry_size = sizeof(struct efi_system_resource_entry_v1); if (tmpesrt.fw_resource_count > 0 && max - size < entry_size) { pr_err("ESRT memory map entry can only hold the header. (max: %zu size: %zu)\n", max - size, entry_size); diff --git a/drivers/firmware/efi/fdtparams.c b/drivers/firmware/efi/fdtparams.c new file mode 100644 index 000000000000..bb042ab7c2be --- /dev/null +++ b/drivers/firmware/efi/fdtparams.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/efi.h> +#include <linux/libfdt.h> +#include <linux/of_fdt.h> + +#include <asm/unaligned.h> + +enum { + SYSTAB, + MMBASE, + MMSIZE, + DCSIZE, + DCVERS, + + PARAMCOUNT +}; + +static __initconst const char name[][22] = { + [SYSTAB] = "System Table ", + [MMBASE] = "MemMap Address ", + [MMSIZE] = "MemMap Size ", + [DCSIZE] = "MemMap Desc. Size ", + [DCVERS] = "MemMap Desc. Version ", +}; + +static __initconst const struct { + const char path[17]; + const char params[PARAMCOUNT][26]; +} dt_params[] = { + { +#ifdef CONFIG_XEN // <-------17------> + .path = "/hypervisor/uefi", + .params = { + [SYSTAB] = "xen,uefi-system-table", + [MMBASE] = "xen,uefi-mmap-start", + [MMSIZE] = "xen,uefi-mmap-size", + [DCSIZE] = "xen,uefi-mmap-desc-size", + [DCVERS] = "xen,uefi-mmap-desc-ver", + } + }, { +#endif + .path = "/chosen", + .params = { // <-----------26-----------> + [SYSTAB] = "linux,uefi-system-table", + [MMBASE] = "linux,uefi-mmap-start", + [MMSIZE] = "linux,uefi-mmap-size", + [DCSIZE] = "linux,uefi-mmap-desc-size", + [DCVERS] = "linux,uefi-mmap-desc-ver", + } + } +}; + +static int __init efi_get_fdt_prop(const void *fdt, int node, const char *pname, + const char *rname, void *var, int size) +{ + const void *prop; + int len; + u64 val; + + prop = fdt_getprop(fdt, node, pname, &len); + if (!prop) + return 1; + + val = (len == 4) ? (u64)be32_to_cpup(prop) : get_unaligned_be64(prop); + + if (size == 8) + *(u64 *)var = val; + else + *(u32 *)var = (val < U32_MAX) ? val : U32_MAX; // saturate + + if (efi_enabled(EFI_DBG)) + pr_info(" %s: 0x%0*llx\n", rname, size * 2, val); + + return 0; +} + +u64 __init efi_get_fdt_params(struct efi_memory_map_data *mm) +{ + const void *fdt = initial_boot_params; + unsigned long systab; + int i, j, node; + struct { + void *var; + int size; + } target[] = { + [SYSTAB] = { &systab, sizeof(systab) }, + [MMBASE] = { &mm->phys_map, sizeof(mm->phys_map) }, + [MMSIZE] = { &mm->size, sizeof(mm->size) }, + [DCSIZE] = { &mm->desc_size, sizeof(mm->desc_size) }, + [DCVERS] = { &mm->desc_version, sizeof(mm->desc_version) }, + }; + + BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(name)); + BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(dt_params[0].params)); + + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { + node = fdt_path_offset(fdt, dt_params[i].path); + if (node < 0) + continue; + + if (efi_enabled(EFI_DBG)) + pr_info("Getting UEFI parameters from %s in DT:\n", + dt_params[i].path); + + for (j = 0; j < ARRAY_SIZE(target); j++) { + const char *pname = dt_params[i].params[j]; + + if (!efi_get_fdt_prop(fdt, node, pname, name[j], + target[j].var, target[j].size)) + continue; + if (!j) + goto notfound; + pr_err("Can't find property '%s' in DT!\n", pname); + return 0; + } + return systab; + } +notfound: + pr_info("UEFI not found.\n"); + return 0; +} diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 98a81576213d..094eabdecfe6 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -12,7 +12,8 @@ cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \ -mno-mmx -mno-sse -fshort-wchar \ -Wno-pointer-sign \ $(call cc-disable-warning, address-of-packed-member) \ - $(call cc-disable-warning, gnu) + $(call cc-disable-warning, gnu) \ + -fno-asynchronous-unwind-tables # arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly # disable the stackleak plugin @@ -25,6 +26,7 @@ cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ cflags-$(CONFIG_EFI_ARMSTUB) += -I$(srctree)/scripts/dtc/libfdt KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \ + -include $(srctree)/drivers/firmware/efi/libstub/hidden.h \ -D__NO_FORTIFY \ $(call cc-option,-ffreestanding) \ $(call cc-option,-fno-stack-protector) \ @@ -39,11 +41,11 @@ OBJECT_FILES_NON_STANDARD := y KCOV_INSTRUMENT := n lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \ - random.o pci.o + file.o mem.o random.o randomalloc.o pci.o \ + skip_spaces.o lib-cmdline.o lib-ctype.o # include the stub's generic dependencies from lib/ when building for ARM/arm64 arm-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c -arm-deps-$(CONFIG_ARM64) += sort.c $(obj)/lib-%.o: $(srctree)/lib/%.c FORCE $(call if_changed_rule,cc_o_c) @@ -53,6 +55,7 @@ lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o \ lib-$(CONFIG_ARM) += arm32-stub.o lib-$(CONFIG_ARM64) += arm64-stub.o +lib-$(CONFIG_X86) += x86-stub.o CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c index 7bbef4a67350..99a5cde7c2d8 100644 --- a/drivers/firmware/efi/libstub/arm-stub.c +++ b/drivers/firmware/efi/libstub/arm-stub.c @@ -10,7 +10,7 @@ */ #include <linux/efi.h> -#include <linux/sort.h> +#include <linux/libfdt.h> #include <asm/efi.h> #include "efistub.h" @@ -36,6 +36,7 @@ #endif static u64 virtmap_base = EFI_RT_VIRTUAL_BASE; +static bool __efistub_global flat_va_mapping; static efi_system_table_t *__efistub_global sys_table; @@ -87,6 +88,39 @@ void install_memreserve_table(void) pr_efi_err("Failed to install memreserve config table!\n"); } +static unsigned long get_dram_base(void) +{ + efi_status_t status; + unsigned long map_size, buff_size; + unsigned long membase = EFI_ERROR; + struct efi_memory_map map; + efi_memory_desc_t *md; + struct efi_boot_memmap boot_map; + + boot_map.map = (efi_memory_desc_t **)&map.map; + boot_map.map_size = &map_size; + boot_map.desc_size = &map.desc_size; + boot_map.desc_ver = NULL; + boot_map.key_ptr = NULL; + boot_map.buff_size = &buff_size; + + status = efi_get_memory_map(&boot_map); + if (status != EFI_SUCCESS) + return membase; + + map.map_end = map.map + map_size; + + for_each_efi_memory_desc_in_map(&map, md) { + if (md->attribute & EFI_MEMORY_WB) { + if (membase > md->phys_addr) + membase = md->phys_addr; + } + } + + efi_bs_call(free_pool, map.map); + + return membase; +} /* * This function handles the architcture specific differences between arm and @@ -100,38 +134,46 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, unsigned long *reserve_size, unsigned long dram_base, efi_loaded_image_t *image); + +asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint, + unsigned long fdt_addr, + unsigned long fdt_size); + /* * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint * that is described in the PE/COFF header. Most of the code is the same * for both archictectures, with the arch-specific code provided in the * handle_kernel_image() function. */ -unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, - unsigned long *image_addr) +efi_status_t efi_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg) { efi_loaded_image_t *image; efi_status_t status; + unsigned long image_addr; unsigned long image_size = 0; unsigned long dram_base; /* addr/point and size pairs for memory management*/ - unsigned long initrd_addr; - u64 initrd_size = 0; + unsigned long initrd_addr = 0; + unsigned long initrd_size = 0; unsigned long fdt_addr = 0; /* Original DTB */ unsigned long fdt_size = 0; char *cmdline_ptr = NULL; int cmdline_size = 0; - unsigned long new_fdt_addr; efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; unsigned long reserve_addr = 0; unsigned long reserve_size = 0; enum efi_secureboot_mode secure_boot; struct screen_info *si; + efi_properties_table_t *prop_tbl; + unsigned long max_addr; sys_table = sys_table_arg; /* Check if we were booted by the EFI firmware */ - if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { + status = EFI_INVALID_PARAMETER; goto fail; + } status = check_platform_features(); if (status != EFI_SUCCESS) @@ -152,6 +194,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, dram_base = get_dram_base(); if (dram_base == EFI_ERROR) { pr_efi_err("Failed to find DRAM base\n"); + status = EFI_LOAD_ERROR; goto fail; } @@ -160,9 +203,10 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, * protocol. We are going to copy the command line into the * device tree, so this can be allocated anywhere. */ - cmdline_ptr = efi_convert_cmdline(image, &cmdline_size); + cmdline_ptr = efi_convert_cmdline(image, &cmdline_size, ULONG_MAX); if (!cmdline_ptr) { pr_efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n"); + status = EFI_OUT_OF_RESOURCES; goto fail; } @@ -178,7 +222,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, si = setup_graphics(); - status = handle_kernel_image(image_addr, &image_size, + status = handle_kernel_image(&image_addr, &image_size, &reserve_addr, &reserve_size, dram_base, image); @@ -204,8 +248,7 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, if (strstr(cmdline_ptr, "dtb=")) pr_efi("Ignoring DTB from command line.\n"); } else { - status = handle_cmdline_files(image, cmdline_ptr, "dtb=", - ~0UL, &fdt_addr, &fdt_size); + status = efi_load_dtb(image, &fdt_addr, &fdt_size); if (status != EFI_SUCCESS) { pr_efi_err("Failed to load device tree!\n"); @@ -225,18 +268,38 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, if (!fdt_addr) pr_efi("Generating empty DTB\n"); - status = handle_cmdline_files(image, cmdline_ptr, "initrd=", - efi_get_max_initrd_addr(dram_base, - *image_addr), - (unsigned long *)&initrd_addr, - (unsigned long *)&initrd_size); - if (status != EFI_SUCCESS) - pr_efi_err("Failed initrd from command line!\n"); + if (!noinitrd()) { + max_addr = efi_get_max_initrd_addr(dram_base, image_addr); + status = efi_load_initrd_dev_path(&initrd_addr, &initrd_size, + max_addr); + if (status == EFI_SUCCESS) { + pr_efi("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n"); + } else if (status == EFI_NOT_FOUND) { + status = efi_load_initrd(image, &initrd_addr, &initrd_size, + ULONG_MAX, max_addr); + if (status == EFI_SUCCESS && initrd_size > 0) + pr_efi("Loaded initrd from command line option\n"); + } + if (status != EFI_SUCCESS) + pr_efi_err("Failed to load initrd!\n"); + } efi_random_get_seed(); + /* + * If the NX PE data feature is enabled in the properties table, we + * should take care not to create a virtual mapping that changes the + * relative placement of runtime services code and data regions, as + * they may belong to the same PE/COFF executable image in memory. + * The easiest way to achieve that is to simply use a 1:1 mapping. + */ + prop_tbl = get_efi_config_table(EFI_PROPERTIES_TABLE_GUID); + flat_va_mapping = prop_tbl && + (prop_tbl->memory_protection_attribute & + EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA); + /* hibernation expects the runtime regions to stay in the same place */ - if (!IS_ENABLED(CONFIG_HIBERNATION) && !nokaslr()) { + if (!IS_ENABLED(CONFIG_HIBERNATION) && !nokaslr() && !flat_va_mapping) { /* * Randomize the base of the UEFI runtime services region. * Preserve the 2 MB alignment of the region by taking a @@ -257,71 +320,30 @@ unsigned long efi_entry(void *handle, efi_system_table_t *sys_table_arg, install_memreserve_table(); - new_fdt_addr = fdt_addr; - status = allocate_new_fdt_and_exit_boot(handle, - &new_fdt_addr, efi_get_max_fdt_addr(dram_base), - initrd_addr, initrd_size, cmdline_ptr, - fdt_addr, fdt_size); + status = allocate_new_fdt_and_exit_boot(handle, &fdt_addr, + efi_get_max_fdt_addr(dram_base), + initrd_addr, initrd_size, + cmdline_ptr, fdt_addr, fdt_size); + if (status != EFI_SUCCESS) + goto fail_free_initrd; - /* - * If all went well, we need to return the FDT address to the - * calling function so it can be passed to kernel as part of - * the kernel boot protocol. - */ - if (status == EFI_SUCCESS) - return new_fdt_addr; + efi_enter_kernel(image_addr, fdt_addr, fdt_totalsize((void *)fdt_addr)); + /* not reached */ +fail_free_initrd: pr_efi_err("Failed to update FDT and exit boot services\n"); efi_free(initrd_size, initrd_addr); efi_free(fdt_size, fdt_addr); fail_free_image: - efi_free(image_size, *image_addr); + efi_free(image_size, image_addr); efi_free(reserve_size, reserve_addr); fail_free_cmdline: free_screen_info(si); efi_free(cmdline_size, (unsigned long)cmdline_ptr); fail: - return EFI_ERROR; -} - -static int cmp_mem_desc(const void *l, const void *r) -{ - const efi_memory_desc_t *left = l, *right = r; - - return (left->phys_addr > right->phys_addr) ? 1 : -1; -} - -/* - * Returns whether region @left ends exactly where region @right starts, - * or false if either argument is NULL. - */ -static bool regions_are_adjacent(efi_memory_desc_t *left, - efi_memory_desc_t *right) -{ - u64 left_end; - - if (left == NULL || right == NULL) - return false; - - left_end = left->phys_addr + left->num_pages * EFI_PAGE_SIZE; - - return left_end == right->phys_addr; -} - -/* - * Returns whether region @left and region @right have compatible memory type - * mapping attributes, and are both EFI_MEMORY_RUNTIME regions. - */ -static bool regions_have_compatible_memory_type_attrs(efi_memory_desc_t *left, - efi_memory_desc_t *right) -{ - static const u64 mem_type_mask = EFI_MEMORY_WB | EFI_MEMORY_WT | - EFI_MEMORY_WC | EFI_MEMORY_UC | - EFI_MEMORY_RUNTIME; - - return ((left->attribute ^ right->attribute) & mem_type_mask) == 0; + return status; } /* @@ -336,23 +358,10 @@ void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, int *count) { u64 efi_virt_base = virtmap_base; - efi_memory_desc_t *in, *prev = NULL, *out = runtime_map; + efi_memory_desc_t *in, *out = runtime_map; int l; - /* - * To work around potential issues with the Properties Table feature - * introduced in UEFI 2.5, which may split PE/COFF executable images - * in memory into several RuntimeServicesCode and RuntimeServicesData - * regions, we need to preserve the relative offsets between adjacent - * EFI_MEMORY_RUNTIME regions with the same memory type attributes. - * The easiest way to find adjacent regions is to sort the memory map - * before traversing it. - */ - if (IS_ENABLED(CONFIG_ARM64)) - sort(memory_map, map_size / desc_size, desc_size, cmp_mem_desc, - NULL); - - for (l = 0; l < map_size; l += desc_size, prev = in) { + for (l = 0; l < map_size; l += desc_size) { u64 paddr, size; in = (void *)memory_map + l; @@ -362,8 +371,8 @@ void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, paddr = in->phys_addr; size = in->num_pages * EFI_PAGE_SIZE; + in->virt_addr = in->phys_addr; if (novamap()) { - in->virt_addr = in->phys_addr; continue; } @@ -372,9 +381,7 @@ void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, * a 4k page size kernel to kexec a 64k page size kernel and * vice versa. */ - if ((IS_ENABLED(CONFIG_ARM64) && - !regions_are_adjacent(prev, in)) || - !regions_have_compatible_memory_type_attrs(prev, in)) { + if (!flat_va_mapping) { paddr = round_down(in->phys_addr, SZ_64K); size += in->phys_addr - paddr; @@ -389,10 +396,10 @@ void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, efi_virt_base = round_up(efi_virt_base, SZ_2M); else efi_virt_base = round_up(efi_virt_base, SZ_64K); - } - in->virt_addr = efi_virt_base + in->phys_addr - paddr; - efi_virt_base += size; + in->virt_addr += efi_virt_base - paddr; + efi_virt_base += size; + } memcpy(out, in, desc_size); out = (void *)out + desc_size; diff --git a/drivers/firmware/efi/libstub/arm32-stub.c b/drivers/firmware/efi/libstub/arm32-stub.c index 7b2a6382b647..7826553af2ba 100644 --- a/drivers/firmware/efi/libstub/arm32-stub.c +++ b/drivers/firmware/efi/libstub/arm32-stub.c @@ -227,6 +227,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, * Relocate the zImage, so that it appears in the lowest 128 MB * memory window. */ + *image_addr = (unsigned long)image->image_base; *image_size = image->image_size; status = efi_relocate_kernel(image_addr, *image_size, *image_size, kernel_base + MAX_UNCOMP_KERNEL_SIZE, 0, 0); diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c index 2915b44132e6..fc9f8ab533a7 100644 --- a/drivers/firmware/efi/libstub/arm64-stub.c +++ b/drivers/firmware/efi/libstub/arm64-stub.c @@ -6,17 +6,11 @@ * Adapted from ARM version by Mark Salter <msalter@redhat.com> */ -/* - * To prevent the compiler from emitting GOT-indirected (and thus absolute) - * references to the section markers, override their visibility as 'hidden' - */ -#pragma GCC visibility push(hidden) -#include <asm/sections.h> -#pragma GCC visibility pop #include <linux/efi.h> #include <asm/efi.h> #include <asm/memory.h> +#include <asm/sections.h> #include <asm/sysreg.h> #include "efistub.h" @@ -49,7 +43,6 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, { efi_status_t status; unsigned long kernel_size, kernel_memsize = 0; - void *old_image_addr = (void *)*image_addr; unsigned long preferred_offset; u64 phys_seed = 0; @@ -82,14 +75,12 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && phys_seed != 0) { /* - * If CONFIG_DEBUG_ALIGN_RODATA is not set, produce a - * displacement in the interval [0, MIN_KIMG_ALIGN) that - * doesn't violate this kernel's de-facto alignment + * Produce a displacement in the interval [0, MIN_KIMG_ALIGN) + * that doesn't violate this kernel's de-facto alignment * constraints. */ u32 mask = (MIN_KIMG_ALIGN - 1) & ~(EFI_KIMG_ALIGN - 1); - u32 offset = !IS_ENABLED(CONFIG_DEBUG_ALIGN_RODATA) ? - (phys_seed >> 32) & mask : TEXT_OFFSET; + u32 offset = (phys_seed >> 32) & mask; /* * With CONFIG_RANDOMIZE_TEXT_OFFSET=y, TEXT_OFFSET may not @@ -123,6 +114,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, * Mustang), we can still place the kernel at the address * 'dram_base + TEXT_OFFSET'. */ + *image_addr = (unsigned long)_text; if (*image_addr == preferred_offset) return EFI_SUCCESS; @@ -147,7 +139,11 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, } *image_addr = *reserve_addr + TEXT_OFFSET; } - memcpy((void *)*image_addr, old_image_addr, kernel_size); + + if (image->image_base != _text) + pr_efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n"); + + memcpy((void *)*image_addr, _text, kernel_size); return EFI_SUCCESS; } diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index 74ddfb496140..9f34c7242939 100644 --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -12,34 +12,27 @@ #include "efistub.h" -/* - * Some firmware implementations have problems reading files in one go. - * A read chunk size of 1MB seems to work for most platforms. - * - * Unfortunately, reading files in chunks triggers *other* bugs on some - * platforms, so we provide a way to disable this workaround, which can - * be done by passing "efi=nochunk" on the EFI boot stub command line. - * - * If you experience issues with initrd images being corrupt it's worth - * trying efi=nochunk, but chunking is enabled by default because there - * are far more machines that require the workaround than those that - * break with it enabled. - */ -#define EFI_READ_CHUNK_SIZE (1024 * 1024) - -static unsigned long efi_chunk_size = EFI_READ_CHUNK_SIZE; - +static bool __efistub_global efi_nochunk; static bool __efistub_global efi_nokaslr; +static bool __efistub_global efi_noinitrd; static bool __efistub_global efi_quiet; static bool __efistub_global efi_novamap; static bool __efistub_global efi_nosoftreserve; static bool __efistub_global efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); +bool __pure nochunk(void) +{ + return efi_nochunk; +} bool __pure nokaslr(void) { return efi_nokaslr; } +bool __pure noinitrd(void) +{ + return efi_noinitrd; +} bool __pure is_quiet(void) { return efi_quiet; @@ -53,13 +46,6 @@ bool __pure __efi_soft_reserve_enabled(void) return !efi_nosoftreserve; } -#define EFI_MMAP_NR_SLACK_SLOTS 8 - -struct file_info { - efi_file_handle_t *handle; - u64 size; -}; - void efi_printk(char *str) { char *s8; @@ -77,369 +63,6 @@ void efi_printk(char *str) } } -static inline bool mmap_has_headroom(unsigned long buff_size, - unsigned long map_size, - unsigned long desc_size) -{ - unsigned long slack = buff_size - map_size; - - return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS; -} - -efi_status_t efi_get_memory_map(struct efi_boot_memmap *map) -{ - efi_memory_desc_t *m = NULL; - efi_status_t status; - unsigned long key; - u32 desc_version; - - *map->desc_size = sizeof(*m); - *map->map_size = *map->desc_size * 32; - *map->buff_size = *map->map_size; -again: - status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, - *map->map_size, (void **)&m); - if (status != EFI_SUCCESS) - goto fail; - - *map->desc_size = 0; - key = 0; - status = efi_bs_call(get_memory_map, map->map_size, m, - &key, map->desc_size, &desc_version); - if (status == EFI_BUFFER_TOO_SMALL || - !mmap_has_headroom(*map->buff_size, *map->map_size, - *map->desc_size)) { - efi_bs_call(free_pool, m); - /* - * Make sure there is some entries of headroom so that the - * buffer can be reused for a new map after allocations are - * no longer permitted. Its unlikely that the map will grow to - * exceed this headroom once we are ready to trigger - * ExitBootServices() - */ - *map->map_size += *map->desc_size * EFI_MMAP_NR_SLACK_SLOTS; - *map->buff_size = *map->map_size; - goto again; - } - - if (status != EFI_SUCCESS) - efi_bs_call(free_pool, m); - - if (map->key_ptr && status == EFI_SUCCESS) - *map->key_ptr = key; - if (map->desc_ver && status == EFI_SUCCESS) - *map->desc_ver = desc_version; - -fail: - *map->map = m; - return status; -} - - -unsigned long get_dram_base(void) -{ - efi_status_t status; - unsigned long map_size, buff_size; - unsigned long membase = EFI_ERROR; - struct efi_memory_map map; - efi_memory_desc_t *md; - struct efi_boot_memmap boot_map; - - boot_map.map = (efi_memory_desc_t **)&map.map; - boot_map.map_size = &map_size; - boot_map.desc_size = &map.desc_size; - boot_map.desc_ver = NULL; - boot_map.key_ptr = NULL; - boot_map.buff_size = &buff_size; - - status = efi_get_memory_map(&boot_map); - if (status != EFI_SUCCESS) - return membase; - - map.map_end = map.map + map_size; - - for_each_efi_memory_desc_in_map(&map, md) { - if (md->attribute & EFI_MEMORY_WB) { - if (membase > md->phys_addr) - membase = md->phys_addr; - } - } - - efi_bs_call(free_pool, map.map); - - return membase; -} - -/* - * Allocate at the highest possible address that is not above 'max'. - */ -efi_status_t efi_high_alloc(unsigned long size, unsigned long align, - unsigned long *addr, unsigned long max) -{ - unsigned long map_size, desc_size, buff_size; - efi_memory_desc_t *map; - efi_status_t status; - unsigned long nr_pages; - u64 max_addr = 0; - int i; - struct efi_boot_memmap boot_map; - - boot_map.map = ↦ - boot_map.map_size = &map_size; - boot_map.desc_size = &desc_size; - boot_map.desc_ver = NULL; - boot_map.key_ptr = NULL; - boot_map.buff_size = &buff_size; - - status = efi_get_memory_map(&boot_map); - if (status != EFI_SUCCESS) - goto fail; - - /* - * Enforce minimum alignment that EFI or Linux requires when - * requesting a specific address. We are doing page-based (or - * larger) allocations, and both the address and size must meet - * alignment constraints. - */ - if (align < EFI_ALLOC_ALIGN) - align = EFI_ALLOC_ALIGN; - - size = round_up(size, EFI_ALLOC_ALIGN); - nr_pages = size / EFI_PAGE_SIZE; -again: - for (i = 0; i < map_size / desc_size; i++) { - efi_memory_desc_t *desc; - unsigned long m = (unsigned long)map; - u64 start, end; - - desc = efi_early_memdesc_ptr(m, desc_size, i); - if (desc->type != EFI_CONVENTIONAL_MEMORY) - continue; - - if (efi_soft_reserve_enabled() && - (desc->attribute & EFI_MEMORY_SP)) - continue; - - if (desc->num_pages < nr_pages) - continue; - - start = desc->phys_addr; - end = start + desc->num_pages * EFI_PAGE_SIZE; - - if (end > max) - end = max; - - if ((start + size) > end) - continue; - - if (round_down(end - size, align) < start) - continue; - - start = round_down(end - size, align); - - /* - * Don't allocate at 0x0. It will confuse code that - * checks pointers against NULL. - */ - if (start == 0x0) - continue; - - if (start > max_addr) - max_addr = start; - } - - if (!max_addr) - status = EFI_NOT_FOUND; - else { - status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, - EFI_LOADER_DATA, nr_pages, &max_addr); - if (status != EFI_SUCCESS) { - max = max_addr; - max_addr = 0; - goto again; - } - - *addr = max_addr; - } - - efi_bs_call(free_pool, map); -fail: - return status; -} - -/* - * Allocate at the lowest possible address that is not below 'min'. - */ -efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align, - unsigned long *addr, unsigned long min) -{ - unsigned long map_size, desc_size, buff_size; - efi_memory_desc_t *map; - efi_status_t status; - unsigned long nr_pages; - int i; - struct efi_boot_memmap boot_map; - - boot_map.map = ↦ - boot_map.map_size = &map_size; - boot_map.desc_size = &desc_size; - boot_map.desc_ver = NULL; - boot_map.key_ptr = NULL; - boot_map.buff_size = &buff_size; - - status = efi_get_memory_map(&boot_map); - if (status != EFI_SUCCESS) - goto fail; - - /* - * Enforce minimum alignment that EFI or Linux requires when - * requesting a specific address. We are doing page-based (or - * larger) allocations, and both the address and size must meet - * alignment constraints. - */ - if (align < EFI_ALLOC_ALIGN) - align = EFI_ALLOC_ALIGN; - - size = round_up(size, EFI_ALLOC_ALIGN); - nr_pages = size / EFI_PAGE_SIZE; - for (i = 0; i < map_size / desc_size; i++) { - efi_memory_desc_t *desc; - unsigned long m = (unsigned long)map; - u64 start, end; - - desc = efi_early_memdesc_ptr(m, desc_size, i); - - if (desc->type != EFI_CONVENTIONAL_MEMORY) - continue; - - if (efi_soft_reserve_enabled() && - (desc->attribute & EFI_MEMORY_SP)) - continue; - - if (desc->num_pages < nr_pages) - continue; - - start = desc->phys_addr; - end = start + desc->num_pages * EFI_PAGE_SIZE; - - if (start < min) - start = min; - - start = round_up(start, align); - if ((start + size) > end) - continue; - - status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, - EFI_LOADER_DATA, nr_pages, &start); - if (status == EFI_SUCCESS) { - *addr = start; - break; - } - } - - if (i == map_size / desc_size) - status = EFI_NOT_FOUND; - - efi_bs_call(free_pool, map); -fail: - return status; -} - -void efi_free(unsigned long size, unsigned long addr) -{ - unsigned long nr_pages; - - if (!size) - return; - - nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; - efi_bs_call(free_pages, addr, nr_pages); -} - -static efi_status_t efi_file_size(void *__fh, efi_char16_t *filename_16, - void **handle, u64 *file_sz) -{ - efi_file_handle_t *h, *fh = __fh; - efi_file_info_t *info; - efi_status_t status; - efi_guid_t info_guid = EFI_FILE_INFO_ID; - unsigned long info_sz; - - status = fh->open(fh, &h, filename_16, EFI_FILE_MODE_READ, 0); - if (status != EFI_SUCCESS) { - efi_printk("Failed to open file: "); - efi_char16_printk(filename_16); - efi_printk("\n"); - return status; - } - - *handle = h; - - info_sz = 0; - status = h->get_info(h, &info_guid, &info_sz, NULL); - if (status != EFI_BUFFER_TOO_SMALL) { - efi_printk("Failed to get file info size\n"); - return status; - } - -grow: - status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, info_sz, - (void **)&info); - if (status != EFI_SUCCESS) { - efi_printk("Failed to alloc mem for file info\n"); - return status; - } - - status = h->get_info(h, &info_guid, &info_sz, info); - if (status == EFI_BUFFER_TOO_SMALL) { - efi_bs_call(free_pool, info); - goto grow; - } - - *file_sz = info->file_size; - efi_bs_call(free_pool, info); - - if (status != EFI_SUCCESS) - efi_printk("Failed to get initrd info\n"); - - return status; -} - -static efi_status_t efi_file_read(efi_file_handle_t *handle, - unsigned long *size, void *addr) -{ - return handle->read(handle, size, addr); -} - -static efi_status_t efi_file_close(efi_file_handle_t *handle) -{ - return handle->close(handle); -} - -static efi_status_t efi_open_volume(efi_loaded_image_t *image, - efi_file_handle_t **__fh) -{ - efi_file_io_interface_t *io; - efi_file_handle_t *fh; - efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; - efi_status_t status; - efi_handle_t handle = image->device_handle; - - status = efi_bs_call(handle_protocol, handle, &fs_proto, (void **)&io); - if (status != EFI_SUCCESS) { - efi_printk("Failed to handle fs_proto\n"); - return status; - } - - status = io->open_volume(io, &fh); - if (status != EFI_SUCCESS) - efi_printk("Failed to open volume\n"); - else - *__fh = fh; - - return status; -} - /* * Parse the ASCII string 'cmdline' for EFI options, denoted by the efi= * option, e.g. efi=nochunk. @@ -450,316 +73,42 @@ static efi_status_t efi_open_volume(efi_loaded_image_t *image, */ efi_status_t efi_parse_options(char const *cmdline) { - char *str; - - str = strstr(cmdline, "nokaslr"); - if (str == cmdline || (str && str > cmdline && *(str - 1) == ' ')) - efi_nokaslr = true; - - str = strstr(cmdline, "quiet"); - if (str == cmdline || (str && str > cmdline && *(str - 1) == ' ')) - efi_quiet = true; - - /* - * If no EFI parameters were specified on the cmdline we've got - * nothing to do. - */ - str = strstr(cmdline, "efi="); - if (!str) - return EFI_SUCCESS; - - /* Skip ahead to first argument */ - str += strlen("efi="); - - /* - * Remember, because efi= is also used by the kernel we need to - * skip over arguments we don't understand. - */ - while (*str && *str != ' ') { - if (!strncmp(str, "nochunk", 7)) { - str += strlen("nochunk"); - efi_chunk_size = -1UL; - } - - if (!strncmp(str, "novamap", 7)) { - str += strlen("novamap"); - efi_novamap = true; - } - - if (IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && - !strncmp(str, "nosoftreserve", 7)) { - str += strlen("nosoftreserve"); - efi_nosoftreserve = true; - } - - if (!strncmp(str, "disable_early_pci_dma", 21)) { - str += strlen("disable_early_pci_dma"); - efi_disable_pci_dma = true; - } - - if (!strncmp(str, "no_disable_early_pci_dma", 24)) { - str += strlen("no_disable_early_pci_dma"); - efi_disable_pci_dma = false; - } - - /* Group words together, delimited by "," */ - while (*str && *str != ' ' && *str != ',') - str++; - - if (*str == ',') - str++; - } - - return EFI_SUCCESS; -} - -/* - * Check the cmdline for a LILO-style file= arguments. - * - * We only support loading a file from the same filesystem as - * the kernel image. - */ -efi_status_t handle_cmdline_files(efi_loaded_image_t *image, - char *cmd_line, char *option_string, - unsigned long max_addr, - unsigned long *load_addr, - unsigned long *load_size) -{ - struct file_info *files; - unsigned long file_addr; - u64 file_size_total; - efi_file_handle_t *fh = NULL; + size_t len = strlen(cmdline) + 1; efi_status_t status; - int nr_files; - char *str; - int i, j, k; - - file_addr = 0; - file_size_total = 0; - - str = cmd_line; - - j = 0; /* See close_handles */ - - if (!load_addr || !load_size) - return EFI_INVALID_PARAMETER; - - *load_addr = 0; - *load_size = 0; - - if (!str || !*str) - return EFI_SUCCESS; - - for (nr_files = 0; *str; nr_files++) { - str = strstr(str, option_string); - if (!str) - break; - - str += strlen(option_string); - - /* Skip any leading slashes */ - while (*str == '/' || *str == '\\') - str++; - - while (*str && *str != ' ' && *str != '\n') - str++; - } - - if (!nr_files) - return EFI_SUCCESS; - - status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, - nr_files * sizeof(*files), (void **)&files); - if (status != EFI_SUCCESS) { - pr_efi_err("Failed to alloc mem for file handle list\n"); - goto fail; - } - - str = cmd_line; - for (i = 0; i < nr_files; i++) { - struct file_info *file; - efi_char16_t filename_16[256]; - efi_char16_t *p; - - str = strstr(str, option_string); - if (!str) - break; - - str += strlen(option_string); - - file = &files[i]; - p = filename_16; - - /* Skip any leading slashes */ - while (*str == '/' || *str == '\\') - str++; - - while (*str && *str != ' ' && *str != '\n') { - if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16)) - break; - - if (*str == '/') { - *p++ = '\\'; - str++; - } else { - *p++ = *str++; - } - } - - *p = '\0'; + char *str, *buf; - /* Only open the volume once. */ - if (!i) { - status = efi_open_volume(image, &fh); - if (status != EFI_SUCCESS) - goto free_files; - } + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); + if (status != EFI_SUCCESS) + return status; - status = efi_file_size(fh, filename_16, (void **)&file->handle, - &file->size); - if (status != EFI_SUCCESS) - goto close_handles; + str = skip_spaces(memcpy(buf, cmdline, len)); - file_size_total += file->size; - } + while (*str) { + char *param, *val; - if (file_size_total) { - unsigned long addr; + str = next_arg(str, ¶m, &val); - /* - * Multiple files need to be at consecutive addresses in memory, - * so allocate enough memory for all the files. This is used - * for loading multiple files. - */ - status = efi_high_alloc(file_size_total, 0x1000, &file_addr, - max_addr); - if (status != EFI_SUCCESS) { - pr_efi_err("Failed to alloc highmem for files\n"); - goto close_handles; - } + if (!strcmp(param, "nokaslr")) { + efi_nokaslr = true; + } else if (!strcmp(param, "quiet")) { + efi_quiet = true; + } else if (!strcmp(param, "noinitrd")) { + efi_noinitrd = true; + } else if (!strcmp(param, "efi") && val) { + efi_nochunk = parse_option_str(val, "nochunk"); + efi_novamap = parse_option_str(val, "novamap"); - /* We've run out of free low memory. */ - if (file_addr > max_addr) { - pr_efi_err("We've run out of free low memory\n"); - status = EFI_INVALID_PARAMETER; - goto free_file_total; - } + efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && + parse_option_str(val, "nosoftreserve"); - addr = file_addr; - for (j = 0; j < nr_files; j++) { - unsigned long size; - - size = files[j].size; - while (size) { - unsigned long chunksize; - - if (IS_ENABLED(CONFIG_X86) && size > efi_chunk_size) - chunksize = efi_chunk_size; - else - chunksize = size; - - status = efi_file_read(files[j].handle, - &chunksize, - (void *)addr); - if (status != EFI_SUCCESS) { - pr_efi_err("Failed to read file\n"); - goto free_file_total; - } - addr += chunksize; - size -= chunksize; - } - - efi_file_close(files[j].handle); + if (parse_option_str(val, "disable_early_pci_dma")) + efi_disable_pci_dma = true; + if (parse_option_str(val, "no_disable_early_pci_dma")) + efi_disable_pci_dma = false; } - - } - - efi_bs_call(free_pool, files); - - *load_addr = file_addr; - *load_size = file_size_total; - - return status; - -free_file_total: - efi_free(file_size_total, file_addr); - -close_handles: - for (k = j; k < i; k++) - efi_file_close(files[k].handle); -free_files: - efi_bs_call(free_pool, files); -fail: - *load_addr = 0; - *load_size = 0; - - return status; -} -/* - * Relocate a kernel image, either compressed or uncompressed. - * In the ARM64 case, all kernel images are currently - * uncompressed, and as such when we relocate it we need to - * allocate additional space for the BSS segment. Any low - * memory that this function should avoid needs to be - * unavailable in the EFI memory map, as if the preferred - * address is not available the lowest available address will - * be used. - */ -efi_status_t efi_relocate_kernel(unsigned long *image_addr, - unsigned long image_size, - unsigned long alloc_size, - unsigned long preferred_addr, - unsigned long alignment, - unsigned long min_addr) -{ - unsigned long cur_image_addr; - unsigned long new_addr = 0; - efi_status_t status; - unsigned long nr_pages; - efi_physical_addr_t efi_addr = preferred_addr; - - if (!image_addr || !image_size || !alloc_size) - return EFI_INVALID_PARAMETER; - if (alloc_size < image_size) - return EFI_INVALID_PARAMETER; - - cur_image_addr = *image_addr; - - /* - * The EFI firmware loader could have placed the kernel image - * anywhere in memory, but the kernel has restrictions on the - * max physical address it can run at. Some architectures - * also have a prefered address, so first try to relocate - * to the preferred address. If that fails, allocate as low - * as possible while respecting the required alignment. - */ - nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; - status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, - EFI_LOADER_DATA, nr_pages, &efi_addr); - new_addr = efi_addr; - /* - * If preferred address allocation failed allocate as low as - * possible. - */ - if (status != EFI_SUCCESS) { - status = efi_low_alloc_above(alloc_size, alignment, &new_addr, - min_addr); } - if (status != EFI_SUCCESS) { - pr_efi_err("Failed to allocate usable memory for kernel.\n"); - return status; - } - - /* - * We know source/dest won't overlap since both memory ranges - * have been allocated by UEFI, so we can safely use memcpy. - */ - memcpy((void *)new_addr, (void *)cur_image_addr, image_size); - - /* Return the new address of the relocated image. */ - *image_addr = new_addr; - - return status; + efi_bs_call(free_pool, buf); + return EFI_SUCCESS; } /* @@ -811,23 +160,19 @@ static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n) return dst; } -#ifndef MAX_CMDLINE_ADDRESS -#define MAX_CMDLINE_ADDRESS ULONG_MAX -#endif - /* * Convert the unicode UEFI command line to ASCII to pass to kernel. * Size of memory allocated return in *cmd_line_len. * Returns NULL on error. */ char *efi_convert_cmdline(efi_loaded_image_t *image, - int *cmd_line_len) + int *cmd_line_len, unsigned long max_addr) { const u16 *s2; u8 *s1 = NULL; unsigned long cmdline_addr = 0; - int load_options_chars = image->load_options_size / 2; /* UTF-16 */ - const u16 *options = image->load_options; + int load_options_chars = efi_table_attr(image, load_options_size) / 2; + const u16 *options = efi_table_attr(image, load_options); int options_bytes = 0; /* UTF-8 bytes */ int options_chars = 0; /* UTF-16 chars */ efi_status_t status; @@ -849,8 +194,7 @@ char *efi_convert_cmdline(efi_loaded_image_t *image, options_bytes++; /* NUL termination */ - status = efi_high_alloc(options_bytes, 0, &cmdline_addr, - MAX_CMDLINE_ADDRESS); + status = efi_allocate_pages(options_bytes, &cmdline_addr, max_addr); if (status != EFI_SUCCESS) return NULL; @@ -962,3 +306,89 @@ void efi_char16_printk(efi_char16_t *str) efi_call_proto(efi_table_attr(efi_system_table(), con_out), output_string, str); } + +/* + * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way + * for the firmware or bootloader to expose the initrd data directly to the stub + * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is + * very easy to implement. It is a simple Linux initrd specific conduit between + * kernel and firmware, allowing us to put the EFI stub (being part of the + * kernel) in charge of where and when to load the initrd, while leaving it up + * to the firmware to decide whether it needs to expose its filesystem hierarchy + * via EFI protocols. + */ +static const struct { + struct efi_vendor_dev_path vendor; + struct efi_generic_dev_path end; +} __packed initrd_dev_path = { + { + { + EFI_DEV_MEDIA, + EFI_DEV_MEDIA_VENDOR, + sizeof(struct efi_vendor_dev_path), + }, + LINUX_EFI_INITRD_MEDIA_GUID + }, { + EFI_DEV_END_PATH, + EFI_DEV_END_ENTIRE, + sizeof(struct efi_generic_dev_path) + } +}; + +/** + * efi_load_initrd_dev_path - load the initrd from the Linux initrd device path + * @load_addr: pointer to store the address where the initrd was loaded + * @load_size: pointer to store the size of the loaded initrd + * @max: upper limit for the initrd memory allocation + * @return: %EFI_SUCCESS if the initrd was loaded successfully, in which + * case @load_addr and @load_size are assigned accordingly + * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd + * device path + * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL + * %EFI_OUT_OF_RESOURCES if memory allocation failed + * %EFI_LOAD_ERROR in all other cases + */ +efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, + unsigned long *load_size, + unsigned long max) +{ + efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; + efi_device_path_protocol_t *dp; + efi_load_file2_protocol_t *lf2; + unsigned long initrd_addr; + unsigned long initrd_size; + efi_handle_t handle; + efi_status_t status; + + if (!load_addr || !load_size) + return EFI_INVALID_PARAMETER; + + dp = (efi_device_path_protocol_t *)&initrd_dev_path; + status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); + if (status != EFI_SUCCESS) + return status; + + status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, + (void **)&lf2); + if (status != EFI_SUCCESS) + return status; + + status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); + if (status != EFI_BUFFER_TOO_SMALL) + return EFI_LOAD_ERROR; + + status = efi_allocate_pages(initrd_size, &initrd_addr, max); + if (status != EFI_SUCCESS) + return status; + + status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, + (void *)initrd_addr); + if (status != EFI_SUCCESS) { + efi_free(initrd_size, initrd_addr); + return EFI_LOAD_ERROR; + } + + *load_addr = initrd_addr; + *load_size = initrd_size; + return EFI_SUCCESS; +} diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h index c244b165005e..cc90a748bcf0 100644 --- a/drivers/firmware/efi/libstub/efistub.h +++ b/drivers/firmware/efi/libstub/efistub.h @@ -31,7 +31,9 @@ #define __efistub_global #endif +extern bool __pure nochunk(void); extern bool __pure nokaslr(void); +extern bool __pure noinitrd(void); extern bool __pure is_quiet(void); extern bool __pure novamap(void); @@ -43,10 +45,549 @@ extern __pure efi_system_table_t *efi_system_table(void); #define pr_efi_err(msg) efi_printk("EFI stub: ERROR: "msg) -void efi_char16_printk(efi_char16_t *); -void efi_char16_printk(efi_char16_t *); +/* Helper macros for the usual case of using simple C variables: */ +#ifndef fdt_setprop_inplace_var +#define fdt_setprop_inplace_var(fdt, node_offset, name, var) \ + fdt_setprop_inplace((fdt), (node_offset), (name), &(var), sizeof(var)) +#endif + +#ifndef fdt_setprop_var +#define fdt_setprop_var(fdt, node_offset, name, var) \ + fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var)) +#endif + +#define get_efi_var(name, vendor, ...) \ + efi_rt_call(get_variable, (efi_char16_t *)(name), \ + (efi_guid_t *)(vendor), __VA_ARGS__) + +#define set_efi_var(name, vendor, ...) \ + efi_rt_call(set_variable, (efi_char16_t *)(name), \ + (efi_guid_t *)(vendor), __VA_ARGS__) + +#define efi_get_handle_at(array, idx) \ + (efi_is_native() ? (array)[idx] \ + : (efi_handle_t)(unsigned long)((u32 *)(array))[idx]) + +#define efi_get_handle_num(size) \ + ((size) / (efi_is_native() ? sizeof(efi_handle_t) : sizeof(u32))) + +#define for_each_efi_handle(handle, array, size, i) \ + for (i = 0; \ + i < efi_get_handle_num(size) && \ + ((handle = efi_get_handle_at((array), i)) || true); \ + i++) + +/* + * Allocation types for calls to boottime->allocate_pages. + */ +#define EFI_ALLOCATE_ANY_PAGES 0 +#define EFI_ALLOCATE_MAX_ADDRESS 1 +#define EFI_ALLOCATE_ADDRESS 2 +#define EFI_MAX_ALLOCATE_TYPE 3 + +/* + * The type of search to perform when calling boottime->locate_handle + */ +#define EFI_LOCATE_ALL_HANDLES 0 +#define EFI_LOCATE_BY_REGISTER_NOTIFY 1 +#define EFI_LOCATE_BY_PROTOCOL 2 + +struct efi_boot_memmap { + efi_memory_desc_t **map; + unsigned long *map_size; + unsigned long *desc_size; + u32 *desc_ver; + unsigned long *key_ptr; + unsigned long *buff_size; +}; + +typedef struct efi_generic_dev_path efi_device_path_protocol_t; + +/* + * EFI Boot Services table + */ +union efi_boot_services { + struct { + efi_table_hdr_t hdr; + void *raise_tpl; + void *restore_tpl; + efi_status_t (__efiapi *allocate_pages)(int, int, unsigned long, + efi_physical_addr_t *); + efi_status_t (__efiapi *free_pages)(efi_physical_addr_t, + unsigned long); + efi_status_t (__efiapi *get_memory_map)(unsigned long *, void *, + unsigned long *, + unsigned long *, u32 *); + efi_status_t (__efiapi *allocate_pool)(int, unsigned long, + void **); + efi_status_t (__efiapi *free_pool)(void *); + void *create_event; + void *set_timer; + void *wait_for_event; + void *signal_event; + void *close_event; + void *check_event; + void *install_protocol_interface; + void *reinstall_protocol_interface; + void *uninstall_protocol_interface; + efi_status_t (__efiapi *handle_protocol)(efi_handle_t, + efi_guid_t *, void **); + void *__reserved; + void *register_protocol_notify; + efi_status_t (__efiapi *locate_handle)(int, efi_guid_t *, + void *, unsigned long *, + efi_handle_t *); + efi_status_t (__efiapi *locate_device_path)(efi_guid_t *, + efi_device_path_protocol_t **, + efi_handle_t *); + efi_status_t (__efiapi *install_configuration_table)(efi_guid_t *, + void *); + void *load_image; + void *start_image; + efi_status_t __noreturn (__efiapi *exit)(efi_handle_t, + efi_status_t, + unsigned long, + efi_char16_t *); + void *unload_image; + efi_status_t (__efiapi *exit_boot_services)(efi_handle_t, + unsigned long); + void *get_next_monotonic_count; + void *stall; + void *set_watchdog_timer; + void *connect_controller; + efi_status_t (__efiapi *disconnect_controller)(efi_handle_t, + efi_handle_t, + efi_handle_t); + void *open_protocol; + void *close_protocol; + void *open_protocol_information; + void *protocols_per_handle; + void *locate_handle_buffer; + efi_status_t (__efiapi *locate_protocol)(efi_guid_t *, void *, + void **); + void *install_multiple_protocol_interfaces; + void *uninstall_multiple_protocol_interfaces; + void *calculate_crc32; + void *copy_mem; + void *set_mem; + void *create_event_ex; + }; + struct { + efi_table_hdr_t hdr; + u32 raise_tpl; + u32 restore_tpl; + u32 allocate_pages; + u32 free_pages; + u32 get_memory_map; + u32 allocate_pool; + u32 free_pool; + u32 create_event; + u32 set_timer; + u32 wait_for_event; + u32 signal_event; + u32 close_event; + u32 check_event; + u32 install_protocol_interface; + u32 reinstall_protocol_interface; + u32 uninstall_protocol_interface; + u32 handle_protocol; + u32 __reserved; + u32 register_protocol_notify; + u32 locate_handle; + u32 locate_device_path; + u32 install_configuration_table; + u32 load_image; + u32 start_image; + u32 exit; + u32 unload_image; + u32 exit_boot_services; + u32 get_next_monotonic_count; + u32 stall; + u32 set_watchdog_timer; + u32 connect_controller; + u32 disconnect_controller; + u32 open_protocol; + u32 close_protocol; + u32 open_protocol_information; + u32 protocols_per_handle; + u32 locate_handle_buffer; + u32 locate_protocol; + u32 install_multiple_protocol_interfaces; + u32 uninstall_multiple_protocol_interfaces; + u32 calculate_crc32; + u32 copy_mem; + u32 set_mem; + u32 create_event_ex; + } mixed_mode; +}; + +typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t; + +union efi_uga_draw_protocol { + struct { + efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *, + u32*, u32*, u32*, u32*); + void *set_mode; + void *blt; + }; + struct { + u32 get_mode; + u32 set_mode; + u32 blt; + } mixed_mode; +}; + +union efi_simple_text_output_protocol { + struct { + void *reset; + efi_status_t (__efiapi *output_string)(efi_simple_text_output_protocol_t *, + efi_char16_t *); + void *test_string; + }; + struct { + u32 reset; + u32 output_string; + u32 test_string; + } mixed_mode; +}; + +#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0 +#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1 +#define PIXEL_BIT_MASK 2 +#define PIXEL_BLT_ONLY 3 +#define PIXEL_FORMAT_MAX 4 + +typedef struct { + u32 red_mask; + u32 green_mask; + u32 blue_mask; + u32 reserved_mask; +} efi_pixel_bitmask_t; + +typedef struct { + u32 version; + u32 horizontal_resolution; + u32 vertical_resolution; + int pixel_format; + efi_pixel_bitmask_t pixel_information; + u32 pixels_per_scan_line; +} efi_graphics_output_mode_info_t; + +typedef union efi_graphics_output_protocol_mode efi_graphics_output_protocol_mode_t; + +union efi_graphics_output_protocol_mode { + struct { + u32 max_mode; + u32 mode; + efi_graphics_output_mode_info_t *info; + unsigned long size_of_info; + efi_physical_addr_t frame_buffer_base; + unsigned long frame_buffer_size; + }; + struct { + u32 max_mode; + u32 mode; + u32 info; + u32 size_of_info; + u64 frame_buffer_base; + u32 frame_buffer_size; + } mixed_mode; +}; + +typedef union efi_graphics_output_protocol efi_graphics_output_protocol_t; + +union efi_graphics_output_protocol { + struct { + void *query_mode; + void *set_mode; + void *blt; + efi_graphics_output_protocol_mode_t *mode; + }; + struct { + u32 query_mode; + u32 set_mode; + u32 blt; + u32 mode; + } mixed_mode; +}; + +typedef union { + struct { + u32 revision; + efi_handle_t parent_handle; + efi_system_table_t *system_table; + efi_handle_t device_handle; + void *file_path; + void *reserved; + u32 load_options_size; + void *load_options; + void *image_base; + __aligned_u64 image_size; + unsigned int image_code_type; + unsigned int image_data_type; + efi_status_t (__efiapi *unload)(efi_handle_t image_handle); + }; + struct { + u32 revision; + u32 parent_handle; + u32 system_table; + u32 device_handle; + u32 file_path; + u32 reserved; + u32 load_options_size; + u32 load_options; + u32 image_base; + __aligned_u64 image_size; + u32 image_code_type; + u32 image_data_type; + u32 unload; + } mixed_mode; +} efi_loaded_image_t; + +typedef struct { + u64 size; + u64 file_size; + u64 phys_size; + efi_time_t create_time; + efi_time_t last_access_time; + efi_time_t modification_time; + __aligned_u64 attribute; + efi_char16_t filename[]; +} efi_file_info_t; + +typedef struct efi_file_protocol efi_file_protocol_t; + +struct efi_file_protocol { + u64 revision; + efi_status_t (__efiapi *open) (efi_file_protocol_t *, + efi_file_protocol_t **, + efi_char16_t *, u64, u64); + efi_status_t (__efiapi *close) (efi_file_protocol_t *); + efi_status_t (__efiapi *delete) (efi_file_protocol_t *); + efi_status_t (__efiapi *read) (efi_file_protocol_t *, + unsigned long *, void *); + efi_status_t (__efiapi *write) (efi_file_protocol_t *, + unsigned long, void *); + efi_status_t (__efiapi *get_position)(efi_file_protocol_t *, u64 *); + efi_status_t (__efiapi *set_position)(efi_file_protocol_t *, u64); + efi_status_t (__efiapi *get_info) (efi_file_protocol_t *, + efi_guid_t *, unsigned long *, + void *); + efi_status_t (__efiapi *set_info) (efi_file_protocol_t *, + efi_guid_t *, unsigned long, + void *); + efi_status_t (__efiapi *flush) (efi_file_protocol_t *); +}; -unsigned long get_dram_base(void); +typedef struct efi_simple_file_system_protocol efi_simple_file_system_protocol_t; + +struct efi_simple_file_system_protocol { + u64 revision; + int (__efiapi *open_volume)(efi_simple_file_system_protocol_t *, + efi_file_protocol_t **); +}; + +#define EFI_FILE_MODE_READ 0x0000000000000001 +#define EFI_FILE_MODE_WRITE 0x0000000000000002 +#define EFI_FILE_MODE_CREATE 0x8000000000000000 + +typedef enum { + EfiPciIoWidthUint8, + EfiPciIoWidthUint16, + EfiPciIoWidthUint32, + EfiPciIoWidthUint64, + EfiPciIoWidthFifoUint8, + EfiPciIoWidthFifoUint16, + EfiPciIoWidthFifoUint32, + EfiPciIoWidthFifoUint64, + EfiPciIoWidthFillUint8, + EfiPciIoWidthFillUint16, + EfiPciIoWidthFillUint32, + EfiPciIoWidthFillUint64, + EfiPciIoWidthMaximum +} EFI_PCI_IO_PROTOCOL_WIDTH; + +typedef enum { + EfiPciIoAttributeOperationGet, + EfiPciIoAttributeOperationSet, + EfiPciIoAttributeOperationEnable, + EfiPciIoAttributeOperationDisable, + EfiPciIoAttributeOperationSupported, + EfiPciIoAttributeOperationMaximum +} EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION; + +typedef struct { + u32 read; + u32 write; +} efi_pci_io_protocol_access_32_t; + +typedef union efi_pci_io_protocol efi_pci_io_protocol_t; + +typedef +efi_status_t (__efiapi *efi_pci_io_protocol_cfg_t)(efi_pci_io_protocol_t *, + EFI_PCI_IO_PROTOCOL_WIDTH, + u32 offset, + unsigned long count, + void *buffer); + +typedef struct { + void *read; + void *write; +} efi_pci_io_protocol_access_t; + +typedef struct { + efi_pci_io_protocol_cfg_t read; + efi_pci_io_protocol_cfg_t write; +} efi_pci_io_protocol_config_access_t; + +union efi_pci_io_protocol { + struct { + void *poll_mem; + void *poll_io; + efi_pci_io_protocol_access_t mem; + efi_pci_io_protocol_access_t io; + efi_pci_io_protocol_config_access_t pci; + void *copy_mem; + void *map; + void *unmap; + void *allocate_buffer; + void *free_buffer; + void *flush; + efi_status_t (__efiapi *get_location)(efi_pci_io_protocol_t *, + unsigned long *segment_nr, + unsigned long *bus_nr, + unsigned long *device_nr, + unsigned long *func_nr); + void *attributes; + void *get_bar_attributes; + void *set_bar_attributes; + uint64_t romsize; + void *romimage; + }; + struct { + u32 poll_mem; + u32 poll_io; + efi_pci_io_protocol_access_32_t mem; + efi_pci_io_protocol_access_32_t io; + efi_pci_io_protocol_access_32_t pci; + u32 copy_mem; + u32 map; + u32 unmap; + u32 allocate_buffer; + u32 free_buffer; + u32 flush; + u32 get_location; + u32 attributes; + u32 get_bar_attributes; + u32 set_bar_attributes; + u64 romsize; + u32 romimage; + } mixed_mode; +}; + +#define EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001 +#define EFI_PCI_IO_ATTRIBUTE_ISA_IO 0x0002 +#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO 0x0004 +#define EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY 0x0008 +#define EFI_PCI_IO_ATTRIBUTE_VGA_IO 0x0010 +#define EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO 0x0020 +#define EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO 0x0040 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080 +#define EFI_PCI_IO_ATTRIBUTE_IO 0x0100 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY 0x0200 +#define EFI_PCI_IO_ATTRIBUTE_BUS_MASTER 0x0400 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_CACHED 0x0800 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_DISABLE 0x1000 +#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE 0x2000 +#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM 0x4000 +#define EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000 +#define EFI_PCI_IO_ATTRIBUTE_ISA_IO_16 0x10000 +#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000 +#define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000 + +struct efi_dev_path; + +typedef union apple_properties_protocol apple_properties_protocol_t; + +union apple_properties_protocol { + struct { + unsigned long version; + efi_status_t (__efiapi *get)(apple_properties_protocol_t *, + struct efi_dev_path *, + efi_char16_t *, void *, u32 *); + efi_status_t (__efiapi *set)(apple_properties_protocol_t *, + struct efi_dev_path *, + efi_char16_t *, void *, u32); + efi_status_t (__efiapi *del)(apple_properties_protocol_t *, + struct efi_dev_path *, + efi_char16_t *); + efi_status_t (__efiapi *get_all)(apple_properties_protocol_t *, + void *buffer, u32 *); + }; + struct { + u32 version; + u32 get; + u32 set; + u32 del; + u32 get_all; + } mixed_mode; +}; + +typedef u32 efi_tcg2_event_log_format; + +typedef union efi_tcg2_protocol efi_tcg2_protocol_t; + +union efi_tcg2_protocol { + struct { + void *get_capability; + efi_status_t (__efiapi *get_event_log)(efi_handle_t, + efi_tcg2_event_log_format, + efi_physical_addr_t *, + efi_physical_addr_t *, + efi_bool_t *); + void *hash_log_extend_event; + void *submit_command; + void *get_active_pcr_banks; + void *set_active_pcr_banks; + void *get_result_of_set_active_pcr_banks; + }; + struct { + u32 get_capability; + u32 get_event_log; + u32 hash_log_extend_event; + u32 submit_command; + u32 get_active_pcr_banks; + u32 set_active_pcr_banks; + u32 get_result_of_set_active_pcr_banks; + } mixed_mode; +}; + +typedef union efi_load_file_protocol efi_load_file_protocol_t; +typedef union efi_load_file_protocol efi_load_file2_protocol_t; + +union efi_load_file_protocol { + struct { + efi_status_t (__efiapi *load_file)(efi_load_file_protocol_t *, + efi_device_path_protocol_t *, + bool, unsigned long *, void *); + }; + struct { + u32 load_file; + } mixed_mode; +}; + +void efi_pci_disable_bridge_busmaster(void); + +typedef efi_status_t (*efi_exit_boot_map_processing)( + struct efi_boot_memmap *map, + void *priv); + +efi_status_t efi_exit_boot_services(void *handle, + struct efi_boot_memmap *map, + void *priv, + efi_exit_boot_map_processing priv_func); + +void efi_char16_printk(efi_char16_t *); efi_status_t allocate_new_fdt_and_exit_boot(void *handle, unsigned long *new_fdt_addr, @@ -71,23 +612,57 @@ efi_status_t check_platform_features(void); void *get_efi_config_table(efi_guid_t guid); -/* Helper macros for the usual case of using simple C variables: */ -#ifndef fdt_setprop_inplace_var -#define fdt_setprop_inplace_var(fdt, node_offset, name, var) \ - fdt_setprop_inplace((fdt), (node_offset), (name), &(var), sizeof(var)) -#endif +void efi_printk(char *str); -#ifndef fdt_setprop_var -#define fdt_setprop_var(fdt, node_offset, name, var) \ - fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var)) -#endif +void efi_free(unsigned long size, unsigned long addr); -#define get_efi_var(name, vendor, ...) \ - efi_rt_call(get_variable, (efi_char16_t *)(name), \ - (efi_guid_t *)(vendor), __VA_ARGS__) +char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len, + unsigned long max_addr); -#define set_efi_var(name, vendor, ...) \ - efi_rt_call(set_variable, (efi_char16_t *)(name), \ - (efi_guid_t *)(vendor), __VA_ARGS__) +efi_status_t efi_get_memory_map(struct efi_boot_memmap *map); + +efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align, + unsigned long *addr, unsigned long min); + +static inline +efi_status_t efi_low_alloc(unsigned long size, unsigned long align, + unsigned long *addr) +{ + /* + * Don't allocate at 0x0. It will confuse code that + * checks pointers against NULL. Skip the first 8 + * bytes so we start at a nice even number. + */ + return efi_low_alloc_above(size, align, addr, 0x8); +} + +efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr, + unsigned long max); + +efi_status_t efi_relocate_kernel(unsigned long *image_addr, + unsigned long image_size, + unsigned long alloc_size, + unsigned long preferred_addr, + unsigned long alignment, + unsigned long min_addr); + +efi_status_t efi_parse_options(char const *cmdline); + +efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto, + unsigned long size); + +efi_status_t efi_load_dtb(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size); + +efi_status_t efi_load_initrd(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size, + unsigned long soft_limit, + unsigned long hard_limit); + +efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, + unsigned long *load_size, + unsigned long max); #endif diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c index 0a91e5232127..46cffac7a5f1 100644 --- a/drivers/firmware/efi/libstub/fdt.c +++ b/drivers/firmware/efi/libstub/fdt.c @@ -199,10 +199,6 @@ static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map) return EFI_SUCCESS; } -#ifndef EFI_FDT_ALIGN -# define EFI_FDT_ALIGN EFI_PAGE_SIZE -#endif - struct exit_boot_struct { efi_memory_desc_t *runtime_map; int *runtime_entry_count; @@ -281,8 +277,7 @@ efi_status_t allocate_new_fdt_and_exit_boot(void *handle, pr_efi("Exiting boot services and installing virtual address map...\n"); map.map = &memory_map; - status = efi_high_alloc(MAX_FDT_SIZE, EFI_FDT_ALIGN, - new_fdt_addr, max_addr); + status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, max_addr); if (status != EFI_SUCCESS) { pr_efi_err("Unable to allocate memory for new device tree.\n"); goto fail; diff --git a/drivers/firmware/efi/libstub/file.c b/drivers/firmware/efi/libstub/file.c new file mode 100644 index 000000000000..d4c7e5f59d2c --- /dev/null +++ b/drivers/firmware/efi/libstub/file.c @@ -0,0 +1,258 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Helper functions used by the EFI stub on multiple + * architectures. This should be #included by the EFI stub + * implementation files. + * + * Copyright 2011 Intel Corporation; author Matt Fleming + */ + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +#define MAX_FILENAME_SIZE 256 + +/* + * Some firmware implementations have problems reading files in one go. + * A read chunk size of 1MB seems to work for most platforms. + * + * Unfortunately, reading files in chunks triggers *other* bugs on some + * platforms, so we provide a way to disable this workaround, which can + * be done by passing "efi=nochunk" on the EFI boot stub command line. + * + * If you experience issues with initrd images being corrupt it's worth + * trying efi=nochunk, but chunking is enabled by default on x86 because + * there are far more machines that require the workaround than those that + * break with it enabled. + */ +#define EFI_READ_CHUNK_SIZE SZ_1M + +static efi_status_t efi_open_file(efi_file_protocol_t *volume, + efi_char16_t *filename_16, + efi_file_protocol_t **handle, + unsigned long *file_size) +{ + struct { + efi_file_info_t info; + efi_char16_t filename[MAX_FILENAME_SIZE]; + } finfo; + efi_guid_t info_guid = EFI_FILE_INFO_ID; + efi_file_protocol_t *fh; + unsigned long info_sz; + efi_status_t status; + + status = volume->open(volume, &fh, filename_16, EFI_FILE_MODE_READ, 0); + if (status != EFI_SUCCESS) { + pr_efi_err("Failed to open file: "); + efi_char16_printk(filename_16); + efi_printk("\n"); + return status; + } + + info_sz = sizeof(finfo); + status = fh->get_info(fh, &info_guid, &info_sz, &finfo); + if (status != EFI_SUCCESS) { + pr_efi_err("Failed to get file info\n"); + fh->close(fh); + return status; + } + + *handle = fh; + *file_size = finfo.info.file_size; + return EFI_SUCCESS; +} + +static efi_status_t efi_open_volume(efi_loaded_image_t *image, + efi_file_protocol_t **fh) +{ + efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; + efi_simple_file_system_protocol_t *io; + efi_status_t status; + + status = efi_bs_call(handle_protocol, image->device_handle, &fs_proto, + (void **)&io); + if (status != EFI_SUCCESS) { + pr_efi_err("Failed to handle fs_proto\n"); + return status; + } + + status = io->open_volume(io, fh); + if (status != EFI_SUCCESS) + pr_efi_err("Failed to open volume\n"); + + return status; +} + +static int find_file_option(const efi_char16_t *cmdline, int cmdline_len, + const efi_char16_t *prefix, int prefix_size, + efi_char16_t *result, int result_len) +{ + int prefix_len = prefix_size / 2; + bool found = false; + int i; + + for (i = prefix_len; i < cmdline_len; i++) { + if (!memcmp(&cmdline[i - prefix_len], prefix, prefix_size)) { + found = true; + break; + } + } + + if (!found) + return 0; + + while (--result_len > 0 && i < cmdline_len) { + if (cmdline[i] == L'\0' || + cmdline[i] == L'\n' || + cmdline[i] == L' ') + break; + *result++ = cmdline[i++]; + } + *result = L'\0'; + return i; +} + +/* + * Check the cmdline for a LILO-style file= arguments. + * + * We only support loading a file from the same filesystem as + * the kernel image. + */ +static efi_status_t handle_cmdline_files(efi_loaded_image_t *image, + const efi_char16_t *optstr, + int optstr_size, + unsigned long soft_limit, + unsigned long hard_limit, + unsigned long *load_addr, + unsigned long *load_size) +{ + const efi_char16_t *cmdline = image->load_options; + int cmdline_len = image->load_options_size / 2; + unsigned long efi_chunk_size = ULONG_MAX; + efi_file_protocol_t *volume = NULL; + efi_file_protocol_t *file; + unsigned long alloc_addr; + unsigned long alloc_size; + efi_status_t status; + int offset; + + if (!load_addr || !load_size) + return EFI_INVALID_PARAMETER; + + if (IS_ENABLED(CONFIG_X86) && !nochunk()) + efi_chunk_size = EFI_READ_CHUNK_SIZE; + + alloc_addr = alloc_size = 0; + do { + efi_char16_t filename[MAX_FILENAME_SIZE]; + unsigned long size; + void *addr; + + offset = find_file_option(cmdline, cmdline_len, + optstr, optstr_size, + filename, ARRAY_SIZE(filename)); + + if (!offset) + break; + + cmdline += offset; + cmdline_len -= offset; + + if (!volume) { + status = efi_open_volume(image, &volume); + if (status != EFI_SUCCESS) + return status; + } + + status = efi_open_file(volume, filename, &file, &size); + if (status != EFI_SUCCESS) + goto err_close_volume; + + /* + * Check whether the existing allocation can contain the next + * file. This condition will also trigger naturally during the + * first (and typically only) iteration of the loop, given that + * alloc_size == 0 in that case. + */ + if (round_up(alloc_size + size, EFI_ALLOC_ALIGN) > + round_up(alloc_size, EFI_ALLOC_ALIGN)) { + unsigned long old_addr = alloc_addr; + + status = EFI_OUT_OF_RESOURCES; + if (soft_limit < hard_limit) + status = efi_allocate_pages(alloc_size + size, + &alloc_addr, + soft_limit); + if (status == EFI_OUT_OF_RESOURCES) + status = efi_allocate_pages(alloc_size + size, + &alloc_addr, + hard_limit); + if (status != EFI_SUCCESS) { + pr_efi_err("Failed to allocate memory for files\n"); + goto err_close_file; + } + + if (old_addr != 0) { + /* + * This is not the first time we've gone + * around this loop, and so we are loading + * multiple files that need to be concatenated + * and returned in a single buffer. + */ + memcpy((void *)alloc_addr, (void *)old_addr, alloc_size); + efi_free(alloc_size, old_addr); + } + } + + addr = (void *)alloc_addr + alloc_size; + alloc_size += size; + + while (size) { + unsigned long chunksize = min(size, efi_chunk_size); + + status = file->read(file, &chunksize, addr); + if (status != EFI_SUCCESS) { + pr_efi_err("Failed to read file\n"); + goto err_close_file; + } + addr += chunksize; + size -= chunksize; + } + file->close(file); + } while (offset > 0); + + *load_addr = alloc_addr; + *load_size = alloc_size; + + if (volume) + volume->close(volume); + return EFI_SUCCESS; + +err_close_file: + file->close(file); + +err_close_volume: + volume->close(volume); + efi_free(alloc_size, alloc_addr); + return status; +} + +efi_status_t efi_load_dtb(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size) +{ + return handle_cmdline_files(image, L"dtb=", sizeof(L"dtb=") - 2, + ULONG_MAX, ULONG_MAX, load_addr, load_size); +} + +efi_status_t efi_load_initrd(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size, + unsigned long soft_limit, + unsigned long hard_limit) +{ + return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2, + soft_limit, hard_limit, load_addr, load_size); +} diff --git a/drivers/firmware/efi/libstub/hidden.h b/drivers/firmware/efi/libstub/hidden.h new file mode 100644 index 000000000000..3493b041f419 --- /dev/null +++ b/drivers/firmware/efi/libstub/hidden.h @@ -0,0 +1,6 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * To prevent the compiler from emitting GOT-indirected (and thus absolute) + * references to any global symbols, override their visibility as 'hidden' + */ +#pragma GCC visibility push(hidden) diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c new file mode 100644 index 000000000000..869a79c8946f --- /dev/null +++ b/drivers/firmware/efi/libstub/mem.c @@ -0,0 +1,309 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +#define EFI_MMAP_NR_SLACK_SLOTS 8 + +static inline bool mmap_has_headroom(unsigned long buff_size, + unsigned long map_size, + unsigned long desc_size) +{ + unsigned long slack = buff_size - map_size; + + return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS; +} + +/** + * efi_get_memory_map() - get memory map + * @map: on return pointer to memory map + * + * Retrieve the UEFI memory map. The allocated memory leaves room for + * up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries. + * + * Return: status code + */ +efi_status_t efi_get_memory_map(struct efi_boot_memmap *map) +{ + efi_memory_desc_t *m = NULL; + efi_status_t status; + unsigned long key; + u32 desc_version; + + *map->desc_size = sizeof(*m); + *map->map_size = *map->desc_size * 32; + *map->buff_size = *map->map_size; +again: + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + *map->map_size, (void **)&m); + if (status != EFI_SUCCESS) + goto fail; + + *map->desc_size = 0; + key = 0; + status = efi_bs_call(get_memory_map, map->map_size, m, + &key, map->desc_size, &desc_version); + if (status == EFI_BUFFER_TOO_SMALL || + !mmap_has_headroom(*map->buff_size, *map->map_size, + *map->desc_size)) { + efi_bs_call(free_pool, m); + /* + * Make sure there is some entries of headroom so that the + * buffer can be reused for a new map after allocations are + * no longer permitted. Its unlikely that the map will grow to + * exceed this headroom once we are ready to trigger + * ExitBootServices() + */ + *map->map_size += *map->desc_size * EFI_MMAP_NR_SLACK_SLOTS; + *map->buff_size = *map->map_size; + goto again; + } + + if (status == EFI_SUCCESS) { + if (map->key_ptr) + *map->key_ptr = key; + if (map->desc_ver) + *map->desc_ver = desc_version; + } else { + efi_bs_call(free_pool, m); + } + +fail: + *map->map = m; + return status; +} + +/** + * efi_allocate_pages() - Allocate memory pages + * @size: minimum number of bytes to allocate + * @addr: On return the address of the first allocated page. The first + * allocated page has alignment EFI_ALLOC_ALIGN which is an + * architecture dependent multiple of the page size. + * @max: the address that the last allocated memory page shall not + * exceed + * + * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according + * to EFI_ALLOC_ALIGN. The last allocated page will not exceed the address + * given by @max. + * + * Return: status code + */ +efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr, + unsigned long max) +{ + efi_physical_addr_t alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1; + int slack = EFI_ALLOC_ALIGN / EFI_PAGE_SIZE - 1; + efi_status_t status; + + size = round_up(size, EFI_ALLOC_ALIGN); + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS, + EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack, + &alloc_addr); + if (status != EFI_SUCCESS) + return status; + + *addr = ALIGN((unsigned long)alloc_addr, EFI_ALLOC_ALIGN); + + if (slack > 0) { + int l = (alloc_addr % EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; + + if (l) { + efi_bs_call(free_pages, alloc_addr, slack - l + 1); + slack = l - 1; + } + if (slack) + efi_bs_call(free_pages, *addr + size, slack); + } + return EFI_SUCCESS; +} +/** + * efi_low_alloc_above() - allocate pages at or above given address + * @size: size of the memory area to allocate + * @align: minimum alignment of the allocated memory area. It should + * a power of two. + * @addr: on exit the address of the allocated memory + * @min: minimum address to used for the memory allocation + * + * Allocate at the lowest possible address that is not below @min as + * EFI_LOADER_DATA. The allocated pages are aligned according to @align but at + * least EFI_ALLOC_ALIGN. The first allocated page will not below the address + * given by @min. + * + * Return: status code + */ +efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align, + unsigned long *addr, unsigned long min) +{ + unsigned long map_size, desc_size, buff_size; + efi_memory_desc_t *map; + efi_status_t status; + unsigned long nr_pages; + int i; + struct efi_boot_memmap boot_map; + + boot_map.map = ↦ + boot_map.map_size = &map_size; + boot_map.desc_size = &desc_size; + boot_map.desc_ver = NULL; + boot_map.key_ptr = NULL; + boot_map.buff_size = &buff_size; + + status = efi_get_memory_map(&boot_map); + if (status != EFI_SUCCESS) + goto fail; + + /* + * Enforce minimum alignment that EFI or Linux requires when + * requesting a specific address. We are doing page-based (or + * larger) allocations, and both the address and size must meet + * alignment constraints. + */ + if (align < EFI_ALLOC_ALIGN) + align = EFI_ALLOC_ALIGN; + + size = round_up(size, EFI_ALLOC_ALIGN); + nr_pages = size / EFI_PAGE_SIZE; + for (i = 0; i < map_size / desc_size; i++) { + efi_memory_desc_t *desc; + unsigned long m = (unsigned long)map; + u64 start, end; + + desc = efi_early_memdesc_ptr(m, desc_size, i); + + if (desc->type != EFI_CONVENTIONAL_MEMORY) + continue; + + if (efi_soft_reserve_enabled() && + (desc->attribute & EFI_MEMORY_SP)) + continue; + + if (desc->num_pages < nr_pages) + continue; + + start = desc->phys_addr; + end = start + desc->num_pages * EFI_PAGE_SIZE; + + if (start < min) + start = min; + + start = round_up(start, align); + if ((start + size) > end) + continue; + + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, + EFI_LOADER_DATA, nr_pages, &start); + if (status == EFI_SUCCESS) { + *addr = start; + break; + } + } + + if (i == map_size / desc_size) + status = EFI_NOT_FOUND; + + efi_bs_call(free_pool, map); +fail: + return status; +} + +/** + * efi_free() - free memory pages + * @size: size of the memory area to free in bytes + * @addr: start of the memory area to free (must be EFI_PAGE_SIZE + * aligned) + * + * @size is rounded up to a multiple of EFI_ALLOC_ALIGN which is an + * architecture specific multiple of EFI_PAGE_SIZE. So this function should + * only be used to return pages allocated with efi_allocate_pages() or + * efi_low_alloc_above(). + */ +void efi_free(unsigned long size, unsigned long addr) +{ + unsigned long nr_pages; + + if (!size) + return; + + nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; + efi_bs_call(free_pages, addr, nr_pages); +} + +/** + * efi_relocate_kernel() - copy memory area + * @image_addr: pointer to address of memory area to copy + * @image_size: size of memory area to copy + * @alloc_size: minimum size of memory to allocate, must be greater or + * equal to image_size + * @preferred_addr: preferred target address + * @alignment: minimum alignment of the allocated memory area. It + * should be a power of two. + * @min_addr: minimum target address + * + * Copy a memory area to a newly allocated memory area aligned according + * to @alignment but at least EFI_ALLOC_ALIGN. If the preferred address + * is not available, the allocated address will not be below @min_addr. + * On exit, @image_addr is updated to the target copy address that was used. + * + * This function is used to copy the Linux kernel verbatim. It does not apply + * any relocation changes. + * + * Return: status code + */ +efi_status_t efi_relocate_kernel(unsigned long *image_addr, + unsigned long image_size, + unsigned long alloc_size, + unsigned long preferred_addr, + unsigned long alignment, + unsigned long min_addr) +{ + unsigned long cur_image_addr; + unsigned long new_addr = 0; + efi_status_t status; + unsigned long nr_pages; + efi_physical_addr_t efi_addr = preferred_addr; + + if (!image_addr || !image_size || !alloc_size) + return EFI_INVALID_PARAMETER; + if (alloc_size < image_size) + return EFI_INVALID_PARAMETER; + + cur_image_addr = *image_addr; + + /* + * The EFI firmware loader could have placed the kernel image + * anywhere in memory, but the kernel has restrictions on the + * max physical address it can run at. Some architectures + * also have a prefered address, so first try to relocate + * to the preferred address. If that fails, allocate as low + * as possible while respecting the required alignment. + */ + nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, + EFI_LOADER_DATA, nr_pages, &efi_addr); + new_addr = efi_addr; + /* + * If preferred address allocation failed allocate as low as + * possible. + */ + if (status != EFI_SUCCESS) { + status = efi_low_alloc_above(alloc_size, alignment, &new_addr, + min_addr); + } + if (status != EFI_SUCCESS) { + pr_efi_err("Failed to allocate usable memory for kernel.\n"); + return status; + } + + /* + * We know source/dest won't overlap since both memory ranges + * have been allocated by UEFI, so we can safely use memcpy. + */ + memcpy((void *)new_addr, (void *)cur_image_addr, image_size); + + /* Return the new address of the relocated image. */ + *image_addr = new_addr; + + return status; +} diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c index 316ce9ff0193..24aa37535372 100644 --- a/drivers/firmware/efi/libstub/random.c +++ b/drivers/firmware/efi/libstub/random.c @@ -4,7 +4,6 @@ */ #include <linux/efi.h> -#include <linux/log2.h> #include <asm/efi.h> #include "efistub.h" @@ -26,6 +25,17 @@ union efi_rng_protocol { } mixed_mode; }; +/** + * efi_get_random_bytes() - fill a buffer with random bytes + * @size: size of the buffer + * @out: caller allocated buffer to receive the random bytes + * + * The call will fail if either the firmware does not implement the + * EFI_RNG_PROTOCOL or there are not enough random bytes available to fill + * the buffer. + * + * Return: status code + */ efi_status_t efi_get_random_bytes(unsigned long size, u8 *out) { efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID; @@ -39,119 +49,19 @@ efi_status_t efi_get_random_bytes(unsigned long size, u8 *out) return efi_call_proto(rng, get_rng, NULL, size, out); } -/* - * Return the number of slots covered by this entry, i.e., the number of - * addresses it covers that are suitably aligned and supply enough room - * for the allocation. +/** + * efi_random_get_seed() - provide random seed as configuration table + * + * The EFI_RNG_PROTOCOL is used to read random bytes. These random bytes are + * saved as a configuration table which can be used as entropy by the kernel + * for the initialization of its pseudo random number generator. + * + * If the EFI_RNG_PROTOCOL is not available or there are not enough random bytes + * available, the configuration table will not be installed and an error code + * will be returned. + * + * Return: status code */ -static unsigned long get_entry_num_slots(efi_memory_desc_t *md, - unsigned long size, - unsigned long align_shift) -{ - unsigned long align = 1UL << align_shift; - u64 first_slot, last_slot, region_end; - - if (md->type != EFI_CONVENTIONAL_MEMORY) - return 0; - - if (efi_soft_reserve_enabled() && - (md->attribute & EFI_MEMORY_SP)) - return 0; - - region_end = min((u64)ULONG_MAX, md->phys_addr + md->num_pages*EFI_PAGE_SIZE - 1); - - first_slot = round_up(md->phys_addr, align); - last_slot = round_down(region_end - size + 1, align); - - if (first_slot > last_slot) - return 0; - - return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1; -} - -/* - * The UEFI memory descriptors have a virtual address field that is only used - * when installing the virtual mapping using SetVirtualAddressMap(). Since it - * is unused here, we can reuse it to keep track of each descriptor's slot - * count. - */ -#define MD_NUM_SLOTS(md) ((md)->virt_addr) - -efi_status_t efi_random_alloc(unsigned long size, - unsigned long align, - unsigned long *addr, - unsigned long random_seed) -{ - unsigned long map_size, desc_size, total_slots = 0, target_slot; - unsigned long buff_size; - efi_status_t status; - efi_memory_desc_t *memory_map; - int map_offset; - struct efi_boot_memmap map; - - map.map = &memory_map; - map.map_size = &map_size; - map.desc_size = &desc_size; - map.desc_ver = NULL; - map.key_ptr = NULL; - map.buff_size = &buff_size; - - status = efi_get_memory_map(&map); - if (status != EFI_SUCCESS) - return status; - - if (align < EFI_ALLOC_ALIGN) - align = EFI_ALLOC_ALIGN; - - /* count the suitable slots in each memory map entry */ - for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { - efi_memory_desc_t *md = (void *)memory_map + map_offset; - unsigned long slots; - - slots = get_entry_num_slots(md, size, ilog2(align)); - MD_NUM_SLOTS(md) = slots; - total_slots += slots; - } - - /* find a random number between 0 and total_slots */ - target_slot = (total_slots * (u16)random_seed) >> 16; - - /* - * target_slot is now a value in the range [0, total_slots), and so - * it corresponds with exactly one of the suitable slots we recorded - * when iterating over the memory map the first time around. - * - * So iterate over the memory map again, subtracting the number of - * slots of each entry at each iteration, until we have found the entry - * that covers our chosen slot. Use the residual value of target_slot - * to calculate the randomly chosen address, and allocate it directly - * using EFI_ALLOCATE_ADDRESS. - */ - for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { - efi_memory_desc_t *md = (void *)memory_map + map_offset; - efi_physical_addr_t target; - unsigned long pages; - - if (target_slot >= MD_NUM_SLOTS(md)) { - target_slot -= MD_NUM_SLOTS(md); - continue; - } - - target = round_up(md->phys_addr, align) + target_slot * align; - pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; - - status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, - EFI_LOADER_DATA, pages, &target); - if (status == EFI_SUCCESS) - *addr = target; - break; - } - - efi_bs_call(free_pool, memory_map); - - return status; -} - efi_status_t efi_random_get_seed(void) { efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID; diff --git a/drivers/firmware/efi/libstub/randomalloc.c b/drivers/firmware/efi/libstub/randomalloc.c new file mode 100644 index 000000000000..4578f59e160c --- /dev/null +++ b/drivers/firmware/efi/libstub/randomalloc.c @@ -0,0 +1,124 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org> + */ + +#include <linux/efi.h> +#include <linux/log2.h> +#include <asm/efi.h> + +#include "efistub.h" + +/* + * Return the number of slots covered by this entry, i.e., the number of + * addresses it covers that are suitably aligned and supply enough room + * for the allocation. + */ +static unsigned long get_entry_num_slots(efi_memory_desc_t *md, + unsigned long size, + unsigned long align_shift) +{ + unsigned long align = 1UL << align_shift; + u64 first_slot, last_slot, region_end; + + if (md->type != EFI_CONVENTIONAL_MEMORY) + return 0; + + if (efi_soft_reserve_enabled() && + (md->attribute & EFI_MEMORY_SP)) + return 0; + + region_end = min(md->phys_addr + md->num_pages * EFI_PAGE_SIZE - 1, + (u64)ULONG_MAX); + + first_slot = round_up(md->phys_addr, align); + last_slot = round_down(region_end - size + 1, align); + + if (first_slot > last_slot) + return 0; + + return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1; +} + +/* + * The UEFI memory descriptors have a virtual address field that is only used + * when installing the virtual mapping using SetVirtualAddressMap(). Since it + * is unused here, we can reuse it to keep track of each descriptor's slot + * count. + */ +#define MD_NUM_SLOTS(md) ((md)->virt_addr) + +efi_status_t efi_random_alloc(unsigned long size, + unsigned long align, + unsigned long *addr, + unsigned long random_seed) +{ + unsigned long map_size, desc_size, total_slots = 0, target_slot; + unsigned long buff_size; + efi_status_t status; + efi_memory_desc_t *memory_map; + int map_offset; + struct efi_boot_memmap map; + + map.map = &memory_map; + map.map_size = &map_size; + map.desc_size = &desc_size; + map.desc_ver = NULL; + map.key_ptr = NULL; + map.buff_size = &buff_size; + + status = efi_get_memory_map(&map); + if (status != EFI_SUCCESS) + return status; + + if (align < EFI_ALLOC_ALIGN) + align = EFI_ALLOC_ALIGN; + + /* count the suitable slots in each memory map entry */ + for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { + efi_memory_desc_t *md = (void *)memory_map + map_offset; + unsigned long slots; + + slots = get_entry_num_slots(md, size, ilog2(align)); + MD_NUM_SLOTS(md) = slots; + total_slots += slots; + } + + /* find a random number between 0 and total_slots */ + target_slot = (total_slots * (u16)random_seed) >> 16; + + /* + * target_slot is now a value in the range [0, total_slots), and so + * it corresponds with exactly one of the suitable slots we recorded + * when iterating over the memory map the first time around. + * + * So iterate over the memory map again, subtracting the number of + * slots of each entry at each iteration, until we have found the entry + * that covers our chosen slot. Use the residual value of target_slot + * to calculate the randomly chosen address, and allocate it directly + * using EFI_ALLOCATE_ADDRESS. + */ + for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { + efi_memory_desc_t *md = (void *)memory_map + map_offset; + efi_physical_addr_t target; + unsigned long pages; + + if (target_slot >= MD_NUM_SLOTS(md)) { + target_slot -= MD_NUM_SLOTS(md); + continue; + } + + target = round_up(md->phys_addr, align) + target_slot * align; + pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; + + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, + EFI_LOADER_DATA, pages, &target); + if (status == EFI_SUCCESS) + *addr = target; + break; + } + + efi_bs_call(free_pool, memory_map); + + return status; +} diff --git a/drivers/firmware/efi/libstub/skip_spaces.c b/drivers/firmware/efi/libstub/skip_spaces.c new file mode 100644 index 000000000000..a700b3c7f7d0 --- /dev/null +++ b/drivers/firmware/efi/libstub/skip_spaces.c @@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/ctype.h> +#include <linux/types.h> + +char *skip_spaces(const char *str) +{ + while (isspace(*str)) + ++str; + return (char *)str; +} diff --git a/drivers/firmware/efi/libstub/string.c b/drivers/firmware/efi/libstub/string.c index ed10e3f602c5..1ac2f8764715 100644 --- a/drivers/firmware/efi/libstub/string.c +++ b/drivers/firmware/efi/libstub/string.c @@ -6,6 +6,7 @@ * Copyright (C) 1991, 1992 Linus Torvalds */ +#include <linux/ctype.h> #include <linux/types.h> #include <linux/string.h> @@ -56,3 +57,58 @@ int strncmp(const char *cs, const char *ct, size_t count) return 0; } #endif + +/* Works only for digits and letters, but small and fast */ +#define TOLOWER(x) ((x) | 0x20) + +static unsigned int simple_guess_base(const char *cp) +{ + if (cp[0] == '0') { + if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) + return 16; + else + return 8; + } else { + return 10; + } +} + +/** + * simple_strtoull - convert a string to an unsigned long long + * @cp: The start of the string + * @endp: A pointer to the end of the parsed string will be placed here + * @base: The number base to use + */ + +unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) +{ + unsigned long long result = 0; + + if (!base) + base = simple_guess_base(cp); + + if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') + cp += 2; + + while (isxdigit(*cp)) { + unsigned int value; + + value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; + if (value >= base) + break; + result = result * base + value; + cp++; + } + if (endp) + *endp = (char *)cp; + + return result; +} + +long simple_strtol(const char *cp, char **endp, unsigned int base) +{ + if (*cp == '-') + return -simple_strtoull(cp + 1, endp, base); + + return simple_strtoull(cp, endp, base); +} diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c new file mode 100644 index 000000000000..8d3a707789de --- /dev/null +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -0,0 +1,837 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* ----------------------------------------------------------------------- + * + * Copyright 2011 Intel Corporation; author Matt Fleming + * + * ----------------------------------------------------------------------- */ + +#include <linux/efi.h> +#include <linux/pci.h> + +#include <asm/efi.h> +#include <asm/e820/types.h> +#include <asm/setup.h> +#include <asm/desc.h> +#include <asm/boot.h> + +#include "efistub.h" + +/* Maximum physical address for 64-bit kernel with 4-level paging */ +#define MAXMEM_X86_64_4LEVEL (1ull << 46) + +static efi_system_table_t *sys_table; +extern const bool efi_is64; +extern u32 image_offset; + +__pure efi_system_table_t *efi_system_table(void) +{ + return sys_table; +} + +__attribute_const__ bool efi_is_64bit(void) +{ + if (IS_ENABLED(CONFIG_EFI_MIXED)) + return efi_is64; + return IS_ENABLED(CONFIG_X86_64); +} + +static efi_status_t +preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) +{ + struct pci_setup_rom *rom = NULL; + efi_status_t status; + unsigned long size; + uint64_t romsize; + void *romimage; + + /* + * Some firmware images contain EFI function pointers at the place where + * the romimage and romsize fields are supposed to be. Typically the EFI + * code is mapped at high addresses, translating to an unrealistically + * large romsize. The UEFI spec limits the size of option ROMs to 16 + * MiB so we reject any ROMs over 16 MiB in size to catch this. + */ + romimage = efi_table_attr(pci, romimage); + romsize = efi_table_attr(pci, romsize); + if (!romimage || !romsize || romsize > SZ_16M) + return EFI_INVALID_PARAMETER; + + size = romsize + sizeof(*rom); + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&rom); + if (status != EFI_SUCCESS) { + efi_printk("Failed to allocate memory for 'rom'\n"); + return status; + } + + memset(rom, 0, sizeof(*rom)); + + rom->data.type = SETUP_PCI; + rom->data.len = size - sizeof(struct setup_data); + rom->data.next = 0; + rom->pcilen = pci->romsize; + *__rom = rom; + + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_VENDOR_ID, 1, &rom->vendor); + + if (status != EFI_SUCCESS) { + efi_printk("Failed to read rom->vendor\n"); + goto free_struct; + } + + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_DEVICE_ID, 1, &rom->devid); + + if (status != EFI_SUCCESS) { + efi_printk("Failed to read rom->devid\n"); + goto free_struct; + } + + status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, + &rom->device, &rom->function); + + if (status != EFI_SUCCESS) + goto free_struct; + + memcpy(rom->romdata, romimage, romsize); + return status; + +free_struct: + efi_bs_call(free_pool, rom); + return status; +} + +/* + * There's no way to return an informative status from this function, + * because any analysis (and printing of error messages) needs to be + * done directly at the EFI function call-site. + * + * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we + * just didn't find any PCI devices, but there's no way to tell outside + * the context of the call. + */ +static void setup_efi_pci(struct boot_params *params) +{ + efi_status_t status; + void **pci_handle = NULL; + efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; + unsigned long size = 0; + struct setup_data *data; + efi_handle_t h; + int i; + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &pci_proto, NULL, &size, pci_handle); + + if (status == EFI_BUFFER_TOO_SMALL) { + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&pci_handle); + + if (status != EFI_SUCCESS) { + efi_printk("Failed to allocate memory for 'pci_handle'\n"); + return; + } + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &pci_proto, NULL, &size, pci_handle); + } + + if (status != EFI_SUCCESS) + goto free_handle; + + data = (struct setup_data *)(unsigned long)params->hdr.setup_data; + + while (data && data->next) + data = (struct setup_data *)(unsigned long)data->next; + + for_each_efi_handle(h, pci_handle, size, i) { + efi_pci_io_protocol_t *pci = NULL; + struct pci_setup_rom *rom; + + status = efi_bs_call(handle_protocol, h, &pci_proto, + (void **)&pci); + if (status != EFI_SUCCESS || !pci) + continue; + + status = preserve_pci_rom_image(pci, &rom); + if (status != EFI_SUCCESS) + continue; + + if (data) + data->next = (unsigned long)rom; + else + params->hdr.setup_data = (unsigned long)rom; + + data = (struct setup_data *)rom; + } + +free_handle: + efi_bs_call(free_pool, pci_handle); +} + +static void retrieve_apple_device_properties(struct boot_params *boot_params) +{ + efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; + struct setup_data *data, *new; + efi_status_t status; + u32 size = 0; + apple_properties_protocol_t *p; + + status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); + if (status != EFI_SUCCESS) + return; + + if (efi_table_attr(p, version) != 0x10000) { + efi_printk("Unsupported properties proto version\n"); + return; + } + + efi_call_proto(p, get_all, NULL, &size); + if (!size) + return; + + do { + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + size + sizeof(struct setup_data), + (void **)&new); + if (status != EFI_SUCCESS) { + efi_printk("Failed to allocate memory for 'properties'\n"); + return; + } + + status = efi_call_proto(p, get_all, new->data, &size); + + if (status == EFI_BUFFER_TOO_SMALL) + efi_bs_call(free_pool, new); + } while (status == EFI_BUFFER_TOO_SMALL); + + new->type = SETUP_APPLE_PROPERTIES; + new->len = size; + new->next = 0; + + data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; + if (!data) { + boot_params->hdr.setup_data = (unsigned long)new; + } else { + while (data->next) + data = (struct setup_data *)(unsigned long)data->next; + data->next = (unsigned long)new; + } +} + +static const efi_char16_t apple[] = L"Apple"; + +static void setup_quirks(struct boot_params *boot_params) +{ + efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) + efi_table_attr(efi_system_table(), fw_vendor); + + if (!memcmp(fw_vendor, apple, sizeof(apple))) { + if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) + retrieve_apple_device_properties(boot_params); + } +} + +/* + * See if we have Universal Graphics Adapter (UGA) protocol + */ +static efi_status_t +setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) +{ + efi_status_t status; + u32 width, height; + void **uga_handle = NULL; + efi_uga_draw_protocol_t *uga = NULL, *first_uga; + efi_handle_t handle; + int i; + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&uga_handle); + if (status != EFI_SUCCESS) + return status; + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + uga_proto, NULL, &size, uga_handle); + if (status != EFI_SUCCESS) + goto free_handle; + + height = 0; + width = 0; + + first_uga = NULL; + for_each_efi_handle(handle, uga_handle, size, i) { + efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; + u32 w, h, depth, refresh; + void *pciio; + + status = efi_bs_call(handle_protocol, handle, uga_proto, + (void **)&uga); + if (status != EFI_SUCCESS) + continue; + + pciio = NULL; + efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); + + status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); + if (status == EFI_SUCCESS && (!first_uga || pciio)) { + width = w; + height = h; + + /* + * Once we've found a UGA supporting PCIIO, + * don't bother looking any further. + */ + if (pciio) + break; + + first_uga = uga; + } + } + + if (!width && !height) + goto free_handle; + + /* EFI framebuffer */ + si->orig_video_isVGA = VIDEO_TYPE_EFI; + + si->lfb_depth = 32; + si->lfb_width = width; + si->lfb_height = height; + + si->red_size = 8; + si->red_pos = 16; + si->green_size = 8; + si->green_pos = 8; + si->blue_size = 8; + si->blue_pos = 0; + si->rsvd_size = 8; + si->rsvd_pos = 24; + +free_handle: + efi_bs_call(free_pool, uga_handle); + + return status; +} + +static void setup_graphics(struct boot_params *boot_params) +{ + efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; + struct screen_info *si; + efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; + efi_status_t status; + unsigned long size; + void **gop_handle = NULL; + void **uga_handle = NULL; + + si = &boot_params->screen_info; + memset(si, 0, sizeof(*si)); + + size = 0; + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &graphics_proto, NULL, &size, gop_handle); + if (status == EFI_BUFFER_TOO_SMALL) + status = efi_setup_gop(si, &graphics_proto, size); + + if (status != EFI_SUCCESS) { + size = 0; + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &uga_proto, NULL, &size, uga_handle); + if (status == EFI_BUFFER_TOO_SMALL) + setup_uga(si, &uga_proto, size); + } +} + + +static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) +{ + efi_bs_call(exit, handle, status, 0, NULL); + for(;;) + asm("hlt"); +} + +void startup_32(struct boot_params *boot_params); + +void __noreturn efi_stub_entry(efi_handle_t handle, + efi_system_table_t *sys_table_arg, + struct boot_params *boot_params); + +/* + * Because the x86 boot code expects to be passed a boot_params we + * need to create one ourselves (usually the bootloader would create + * one for us). + */ +efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, + efi_system_table_t *sys_table_arg) +{ + struct boot_params *boot_params; + struct setup_header *hdr; + efi_loaded_image_t *image; + void *image_base; + efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; + int options_size = 0; + efi_status_t status; + char *cmdline_ptr; + unsigned long ramdisk_addr; + unsigned long ramdisk_size; + + sys_table = sys_table_arg; + + /* Check if we were booted by the EFI firmware */ + if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + efi_exit(handle, EFI_INVALID_PARAMETER); + + status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); + if (status != EFI_SUCCESS) { + efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); + efi_exit(handle, status); + } + + image_base = efi_table_attr(image, image_base); + image_offset = (void *)startup_32 - image_base; + + hdr = &((struct boot_params *)image_base)->hdr; + + status = efi_allocate_pages(0x4000, (unsigned long *)&boot_params, ULONG_MAX); + if (status != EFI_SUCCESS) { + efi_printk("Failed to allocate lowmem for boot params\n"); + efi_exit(handle, status); + } + + memset(boot_params, 0x0, 0x4000); + + hdr = &boot_params->hdr; + + /* Copy the second sector to boot_params */ + memcpy(&hdr->jump, image_base + 512, 512); + + /* + * Fill out some of the header fields ourselves because the + * EFI firmware loader doesn't load the first sector. + */ + hdr->root_flags = 1; + hdr->vid_mode = 0xffff; + hdr->boot_flag = 0xAA55; + + hdr->type_of_loader = 0x21; + + /* Convert unicode cmdline to ascii */ + cmdline_ptr = efi_convert_cmdline(image, &options_size, ULONG_MAX); + if (!cmdline_ptr) + goto fail; + + hdr->cmd_line_ptr = (unsigned long)cmdline_ptr; + /* Fill in upper bits of command line address, NOP on 32 bit */ + boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32; + + hdr->ramdisk_image = 0; + hdr->ramdisk_size = 0; + + if (efi_is_native()) { + status = efi_parse_options(cmdline_ptr); + if (status != EFI_SUCCESS) + goto fail2; + + if (!noinitrd()) { + status = efi_load_initrd(image, &ramdisk_addr, + &ramdisk_size, + hdr->initrd_addr_max, + ULONG_MAX); + if (status != EFI_SUCCESS) + goto fail2; + hdr->ramdisk_image = ramdisk_addr & 0xffffffff; + hdr->ramdisk_size = ramdisk_size & 0xffffffff; + boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32; + boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32; + } + } + + efi_stub_entry(handle, sys_table, boot_params); + /* not reached */ + +fail2: + efi_free(options_size, (unsigned long)cmdline_ptr); +fail: + efi_free(0x4000, (unsigned long)boot_params); + + efi_exit(handle, status); +} + +static void add_e820ext(struct boot_params *params, + struct setup_data *e820ext, u32 nr_entries) +{ + struct setup_data *data; + + e820ext->type = SETUP_E820_EXT; + e820ext->len = nr_entries * sizeof(struct boot_e820_entry); + e820ext->next = 0; + + data = (struct setup_data *)(unsigned long)params->hdr.setup_data; + + while (data && data->next) + data = (struct setup_data *)(unsigned long)data->next; + + if (data) + data->next = (unsigned long)e820ext; + else + params->hdr.setup_data = (unsigned long)e820ext; +} + +static efi_status_t +setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) +{ + struct boot_e820_entry *entry = params->e820_table; + struct efi_info *efi = ¶ms->efi_info; + struct boot_e820_entry *prev = NULL; + u32 nr_entries; + u32 nr_desc; + int i; + + nr_entries = 0; + nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; + + for (i = 0; i < nr_desc; i++) { + efi_memory_desc_t *d; + unsigned int e820_type = 0; + unsigned long m = efi->efi_memmap; + +#ifdef CONFIG_X86_64 + m |= (u64)efi->efi_memmap_hi << 32; +#endif + + d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); + switch (d->type) { + case EFI_RESERVED_TYPE: + case EFI_RUNTIME_SERVICES_CODE: + case EFI_RUNTIME_SERVICES_DATA: + case EFI_MEMORY_MAPPED_IO: + case EFI_MEMORY_MAPPED_IO_PORT_SPACE: + case EFI_PAL_CODE: + e820_type = E820_TYPE_RESERVED; + break; + + case EFI_UNUSABLE_MEMORY: + e820_type = E820_TYPE_UNUSABLE; + break; + + case EFI_ACPI_RECLAIM_MEMORY: + e820_type = E820_TYPE_ACPI; + break; + + case EFI_LOADER_CODE: + case EFI_LOADER_DATA: + case EFI_BOOT_SERVICES_CODE: + case EFI_BOOT_SERVICES_DATA: + case EFI_CONVENTIONAL_MEMORY: + if (efi_soft_reserve_enabled() && + (d->attribute & EFI_MEMORY_SP)) + e820_type = E820_TYPE_SOFT_RESERVED; + else + e820_type = E820_TYPE_RAM; + break; + + case EFI_ACPI_MEMORY_NVS: + e820_type = E820_TYPE_NVS; + break; + + case EFI_PERSISTENT_MEMORY: + e820_type = E820_TYPE_PMEM; + break; + + default: + continue; + } + + /* Merge adjacent mappings */ + if (prev && prev->type == e820_type && + (prev->addr + prev->size) == d->phys_addr) { + prev->size += d->num_pages << 12; + continue; + } + + if (nr_entries == ARRAY_SIZE(params->e820_table)) { + u32 need = (nr_desc - i) * sizeof(struct e820_entry) + + sizeof(struct setup_data); + + if (!e820ext || e820ext_size < need) + return EFI_BUFFER_TOO_SMALL; + + /* boot_params map full, switch to e820 extended */ + entry = (struct boot_e820_entry *)e820ext->data; + } + + entry->addr = d->phys_addr; + entry->size = d->num_pages << PAGE_SHIFT; + entry->type = e820_type; + prev = entry++; + nr_entries++; + } + + if (nr_entries > ARRAY_SIZE(params->e820_table)) { + u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); + + add_e820ext(params, e820ext, nr_e820ext); + nr_entries -= nr_e820ext; + } + + params->e820_entries = (u8)nr_entries; + + return EFI_SUCCESS; +} + +static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, + u32 *e820ext_size) +{ + efi_status_t status; + unsigned long size; + + size = sizeof(struct setup_data) + + sizeof(struct e820_entry) * nr_desc; + + if (*e820ext) { + efi_bs_call(free_pool, *e820ext); + *e820ext = NULL; + *e820ext_size = 0; + } + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)e820ext); + if (status == EFI_SUCCESS) + *e820ext_size = size; + + return status; +} + +static efi_status_t allocate_e820(struct boot_params *params, + struct setup_data **e820ext, + u32 *e820ext_size) +{ + unsigned long map_size, desc_size, buff_size; + struct efi_boot_memmap boot_map; + efi_memory_desc_t *map; + efi_status_t status; + __u32 nr_desc; + + boot_map.map = ↦ + boot_map.map_size = &map_size; + boot_map.desc_size = &desc_size; + boot_map.desc_ver = NULL; + boot_map.key_ptr = NULL; + boot_map.buff_size = &buff_size; + + status = efi_get_memory_map(&boot_map); + if (status != EFI_SUCCESS) + return status; + + nr_desc = buff_size / desc_size; + + if (nr_desc > ARRAY_SIZE(params->e820_table)) { + u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); + + status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); + if (status != EFI_SUCCESS) + return status; + } + + return EFI_SUCCESS; +} + +struct exit_boot_struct { + struct boot_params *boot_params; + struct efi_info *efi; +}; + +static efi_status_t exit_boot_func(struct efi_boot_memmap *map, + void *priv) +{ + const char *signature; + struct exit_boot_struct *p = priv; + + signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE + : EFI32_LOADER_SIGNATURE; + memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); + + p->efi->efi_systab = (unsigned long)efi_system_table(); + p->efi->efi_memdesc_size = *map->desc_size; + p->efi->efi_memdesc_version = *map->desc_ver; + p->efi->efi_memmap = (unsigned long)*map->map; + p->efi->efi_memmap_size = *map->map_size; + +#ifdef CONFIG_X86_64 + p->efi->efi_systab_hi = (unsigned long)efi_system_table() >> 32; + p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32; +#endif + + return EFI_SUCCESS; +} + +static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) +{ + unsigned long map_sz, key, desc_size, buff_size; + efi_memory_desc_t *mem_map; + struct setup_data *e820ext = NULL; + __u32 e820ext_size = 0; + efi_status_t status; + __u32 desc_version; + struct efi_boot_memmap map; + struct exit_boot_struct priv; + + map.map = &mem_map; + map.map_size = &map_sz; + map.desc_size = &desc_size; + map.desc_ver = &desc_version; + map.key_ptr = &key; + map.buff_size = &buff_size; + priv.boot_params = boot_params; + priv.efi = &boot_params->efi_info; + + status = allocate_e820(boot_params, &e820ext, &e820ext_size); + if (status != EFI_SUCCESS) + return status; + + /* Might as well exit boot services now */ + status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); + if (status != EFI_SUCCESS) + return status; + + /* Historic? */ + boot_params->alt_mem_k = 32 * 1024; + + status = setup_e820(boot_params, e820ext, e820ext_size); + if (status != EFI_SUCCESS) + return status; + + return EFI_SUCCESS; +} + +/* + * On success, we return the address of startup_32, which has potentially been + * relocated by efi_relocate_kernel. + * On failure, we exit to the firmware via efi_exit instead of returning. + */ +unsigned long efi_main(efi_handle_t handle, + efi_system_table_t *sys_table_arg, + struct boot_params *boot_params) +{ + unsigned long bzimage_addr = (unsigned long)startup_32; + unsigned long buffer_start, buffer_end; + struct setup_header *hdr = &boot_params->hdr; + efi_status_t status; + unsigned long cmdline_paddr; + + sys_table = sys_table_arg; + + /* Check if we were booted by the EFI firmware */ + if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + efi_exit(handle, EFI_INVALID_PARAMETER); + + /* + * If the kernel isn't already loaded at a suitable address, + * relocate it. + * + * It must be loaded above LOAD_PHYSICAL_ADDR. + * + * The maximum address for 64-bit is 1 << 46 for 4-level paging. This + * is defined as the macro MAXMEM, but unfortunately that is not a + * compile-time constant if 5-level paging is configured, so we instead + * define our own macro for use here. + * + * For 32-bit, the maximum address is complicated to figure out, for + * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what + * KASLR uses. + * + * Also relocate it if image_offset is zero, i.e. we weren't loaded by + * LoadImage, but we are not aligned correctly. + */ + + buffer_start = ALIGN(bzimage_addr - image_offset, + hdr->kernel_alignment); + buffer_end = buffer_start + hdr->init_size; + + if ((buffer_start < LOAD_PHYSICAL_ADDR) || + (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || + (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || + (image_offset == 0 && !IS_ALIGNED(bzimage_addr, + hdr->kernel_alignment))) { + status = efi_relocate_kernel(&bzimage_addr, + hdr->init_size, hdr->init_size, + hdr->pref_address, + hdr->kernel_alignment, + LOAD_PHYSICAL_ADDR); + if (status != EFI_SUCCESS) { + efi_printk("efi_relocate_kernel() failed!\n"); + goto fail; + } + /* + * Now that we've copied the kernel elsewhere, we no longer + * have a set up block before startup_32(), so reset image_offset + * to zero in case it was set earlier. + */ + image_offset = 0; + } + + /* + * efi_pe_entry() may have been called before efi_main(), in which + * case this is the second time we parse the cmdline. This is ok, + * parsing the cmdline multiple times does not have side-effects. + */ + cmdline_paddr = ((u64)hdr->cmd_line_ptr | + ((u64)boot_params->ext_cmd_line_ptr << 32)); + efi_parse_options((char *)cmdline_paddr); + + /* + * At this point, an initrd may already have been loaded, either by + * the bootloader and passed via bootparams, or loaded from a initrd= + * command line option by efi_pe_entry() above. In either case, we + * permit an initrd loaded from the LINUX_EFI_INITRD_MEDIA_GUID device + * path to supersede it. + */ + if (!noinitrd()) { + unsigned long addr, size; + + status = efi_load_initrd_dev_path(&addr, &size, ULONG_MAX); + if (status == EFI_SUCCESS) { + hdr->ramdisk_image = (u32)addr; + hdr->ramdisk_size = (u32)size; + boot_params->ext_ramdisk_image = (u64)addr >> 32; + boot_params->ext_ramdisk_size = (u64)size >> 32; + } else if (status != EFI_NOT_FOUND) { + efi_printk("efi_load_initrd_dev_path() failed!\n"); + goto fail; + } + } + + /* + * If the boot loader gave us a value for secure_boot then we use that, + * otherwise we ask the BIOS. + */ + if (boot_params->secure_boot == efi_secureboot_mode_unset) + boot_params->secure_boot = efi_get_secureboot(); + + /* Ask the firmware to clear memory on unclean shutdown */ + efi_enable_reset_attack_mitigation(); + + efi_random_get_seed(); + + efi_retrieve_tpm2_eventlog(); + + setup_graphics(boot_params); + + setup_efi_pci(boot_params); + + setup_quirks(boot_params); + + status = exit_boot(boot_params, handle); + if (status != EFI_SUCCESS) { + efi_printk("exit_boot() failed!\n"); + goto fail; + } + + return bzimage_addr; +fail: + efi_printk("efi_main() failed!\n"); + + efi_exit(handle, status); +} diff --git a/drivers/firmware/efi/memattr.c b/drivers/firmware/efi/memattr.c index 58452fde92cc..5737cb0fcd44 100644 --- a/drivers/firmware/efi/memattr.c +++ b/drivers/firmware/efi/memattr.c @@ -13,6 +13,7 @@ #include <asm/early_ioremap.h> static int __initdata tbl_size; +unsigned long __ro_after_init efi_mem_attr_table = EFI_INVALID_TABLE_ADDR; /* * Reserve the memory associated with the Memory Attributes configuration @@ -22,13 +23,13 @@ int __init efi_memattr_init(void) { efi_memory_attributes_table_t *tbl; - if (efi.mem_attr_table == EFI_INVALID_TABLE_ADDR) + if (efi_mem_attr_table == EFI_INVALID_TABLE_ADDR) return 0; - tbl = early_memremap(efi.mem_attr_table, sizeof(*tbl)); + tbl = early_memremap(efi_mem_attr_table, sizeof(*tbl)); if (!tbl) { pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n", - efi.mem_attr_table); + efi_mem_attr_table); return -ENOMEM; } @@ -39,7 +40,7 @@ int __init efi_memattr_init(void) } tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size; - memblock_reserve(efi.mem_attr_table, tbl_size); + memblock_reserve(efi_mem_attr_table, tbl_size); set_bit(EFI_MEM_ATTR, &efi.flags); unmap: @@ -147,10 +148,10 @@ int __init efi_memattr_apply_permissions(struct mm_struct *mm, if (WARN_ON(!efi_enabled(EFI_MEMMAP))) return 0; - tbl = memremap(efi.mem_attr_table, tbl_size, MEMREMAP_WB); + tbl = memremap(efi_mem_attr_table, tbl_size, MEMREMAP_WB); if (!tbl) { pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n", - efi.mem_attr_table); + efi_mem_attr_table); return -ENOMEM; } diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c index 7effff969eb9..73089a24f04b 100644 --- a/drivers/firmware/efi/reboot.c +++ b/drivers/firmware/efi/reboot.c @@ -15,7 +15,7 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused) const char *str[] = { "cold", "warm", "shutdown", "platform" }; int efi_mode, cap_reset_mode; - if (!efi_enabled(EFI_RUNTIME_SERVICES)) + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM)) return; switch (reboot_mode) { @@ -64,7 +64,7 @@ static void efi_power_off(void) static int __init efi_shutdown_init(void) { - if (!efi_enabled(EFI_RUNTIME_SERVICES)) + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM)) return -ENODEV; if (efi_poweroff_required()) { diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c index 65fffaa22210..1410beaef5c3 100644 --- a/drivers/firmware/efi/runtime-wrappers.c +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -40,9 +40,9 @@ * code doesn't get too cluttered: */ #define efi_call_virt(f, args...) \ - efi_call_virt_pointer(efi.systab->runtime, f, args) + efi_call_virt_pointer(efi.runtime, f, args) #define __efi_call_virt(f, args...) \ - __efi_call_virt_pointer(efi.systab->runtime, f, args) + __efi_call_virt_pointer(efi.runtime, f, args) struct efi_runtime_work efi_rts_work; diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c index 436d1776bc7b..5f2a4d162795 100644 --- a/drivers/firmware/efi/vars.c +++ b/drivers/firmware/efi/vars.c @@ -1071,7 +1071,7 @@ EXPORT_SYMBOL_GPL(efivar_entry_iter_end); * entry on the list. It is safe for @func to remove entries in the * list via efivar_entry_delete(). * - * You MUST call efivar_enter_iter_begin() before this function, and + * You MUST call efivar_entry_iter_begin() before this function, and * efivar_entry_iter_end() afterwards. * * It is possible to begin iteration from an arbitrary entry within |