From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/firmware/Kconfig | 61 ++++ drivers/firmware/Makefile | 6 + drivers/firmware/edd.c | 790 +++++++++++++++++++++++++++++++++++++++++++++ drivers/firmware/efivars.c | 781 ++++++++++++++++++++++++++++++++++++++++++++ drivers/firmware/pcdp.c | 100 ++++++ drivers/firmware/pcdp.h | 84 +++++ 6 files changed, 1822 insertions(+) create mode 100644 drivers/firmware/Kconfig create mode 100644 drivers/firmware/Makefile create mode 100644 drivers/firmware/edd.c create mode 100644 drivers/firmware/efivars.c create mode 100644 drivers/firmware/pcdp.c create mode 100644 drivers/firmware/pcdp.h (limited to 'drivers/firmware') diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig new file mode 100644 index 000000000000..5b29c3b2a331 --- /dev/null +++ b/drivers/firmware/Kconfig @@ -0,0 +1,61 @@ +# +# For a description of the syntax of this configuration file, +# see Documentation/kbuild/kconfig-language.txt. +# + +menu "Firmware Drivers" + +config EDD + tristate "BIOS Enhanced Disk Drive calls determine boot disk (EXPERIMENTAL)" + depends on EXPERIMENTAL + depends on !IA64 + help + Say Y or M here if you want to enable BIOS Enhanced Disk Drive + Services real mode BIOS calls to determine which disk + BIOS tries boot from. This information is then exported via sysfs. + + This option is experimental and is known to fail to boot on some + obscure configurations. Most disk controller BIOS vendors do + not yet implement this feature. + +config EFI_VARS + tristate "EFI Variable Support via sysfs" + depends on EFI + default n + help + If you say Y here, you are able to get EFI (Extensible Firmware + Interface) variable information via sysfs. You may read, + write, create, and destroy EFI variables through this interface. + + Note that using this driver in concert with efibootmgr requires + at least test release version 0.5.0-test3 or later, which is + available from Matt Domsch's website located at: + + + Subsequent efibootmgr releases may be found at: + + +config EFI_PCDP + bool "Console device selection via EFI PCDP or HCDP table" + depends on ACPI && EFI && IA64 + default y if IA64 + help + If your firmware supplies the PCDP table, and you want to + automatically use the primary console device it describes + as the Linux console, say Y here. + + If your firmware supplies the HCDP table, and you want to + use the first serial port it describes as the Linux console, + say Y here. If your EFI ConOut path contains only a UART + device, it will become the console automatically. Otherwise, + you must specify the "console=hcdp" kernel boot argument. + + Neither the PCDP nor the HCDP affects naming of serial devices, + so a serial console may be /dev/ttyS0, /dev/ttyS1, etc, depending + on how the driver discovers devices. + + You must also enable the appropriate drivers (serial, VGA, etc.) + + See + +endmenu diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile new file mode 100644 index 000000000000..90fd0b26db8b --- /dev/null +++ b/drivers/firmware/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for the linux kernel. +# +obj-$(CONFIG_EDD) += edd.o +obj-$(CONFIG_EFI_VARS) += efivars.o +obj-$(CONFIG_EFI_PCDP) += pcdp.o diff --git a/drivers/firmware/edd.c b/drivers/firmware/edd.c new file mode 100644 index 000000000000..33b669e6f977 --- /dev/null +++ b/drivers/firmware/edd.c @@ -0,0 +1,790 @@ +/* + * linux/arch/i386/kernel/edd.c + * Copyright (C) 2002, 2003, 2004 Dell Inc. + * by Matt Domsch + * disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya + * legacy CHS by Patrick J. LoPresti + * + * BIOS Enhanced Disk Drive Services (EDD) + * conformant to T13 Committee www.t13.org + * projects 1572D, 1484D, 1386D, 1226DT + * + * This code takes information provided by BIOS EDD calls + * fn41 - Check Extensions Present and + * fn48 - Get Device Parametes with EDD extensions + * made in setup.S, copied to safe structures in setup.c, + * and presents it in sysfs. + * + * Please see http://linux.dell.com/edd30/results.html for + * the list of BIOSs which have been reported to implement EDD. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License v2.0 as published by + * the Free Software Foundation + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define EDD_VERSION "0.16" +#define EDD_DATE "2004-Jun-25" + +MODULE_AUTHOR("Matt Domsch "); +MODULE_DESCRIPTION("sysfs interface to BIOS EDD information"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(EDD_VERSION); + +#define left (PAGE_SIZE - (p - buf) - 1) + +struct edd_device { + unsigned int index; + unsigned int mbr_signature; + struct edd_info *info; + struct kobject kobj; +}; + +struct edd_attribute { + struct attribute attr; + ssize_t(*show) (struct edd_device * edev, char *buf); + int (*test) (struct edd_device * edev); +}; + +/* forward declarations */ +static int edd_dev_is_type(struct edd_device *edev, const char *type); +static struct pci_dev *edd_get_pci_dev(struct edd_device *edev); + +static struct edd_device *edd_devices[EDD_MBR_SIG_MAX]; + +#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \ +struct edd_attribute edd_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \ + .show = _show, \ + .test = _test, \ +}; + +static int +edd_has_mbr_signature(struct edd_device *edev) +{ + return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX); +} + +static int +edd_has_edd_info(struct edd_device *edev) +{ + return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR); +} + +static inline struct edd_info * +edd_dev_get_info(struct edd_device *edev) +{ + return edev->info; +} + +static inline void +edd_dev_set_info(struct edd_device *edev, int i) +{ + edev->index = i; + if (edd_has_mbr_signature(edev)) + edev->mbr_signature = edd.mbr_signature[i]; + if (edd_has_edd_info(edev)) + edev->info = &edd.edd_info[i]; +} + +#define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr) +#define to_edd_device(obj) container_of(obj,struct edd_device,kobj) + +static ssize_t +edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf) +{ + struct edd_device *dev = to_edd_device(kobj); + struct edd_attribute *edd_attr = to_edd_attr(attr); + ssize_t ret = 0; + + if (edd_attr->show) + ret = edd_attr->show(dev, buf); + return ret; +} + +static struct sysfs_ops edd_attr_ops = { + .show = edd_attr_show, +}; + +static ssize_t +edd_show_host_bus(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + int i; + + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + for (i = 0; i < 4; i++) { + if (isprint(info->params.host_bus_type[i])) { + p += scnprintf(p, left, "%c", info->params.host_bus_type[i]); + } else { + p += scnprintf(p, left, " "); + } + } + + if (!strncmp(info->params.host_bus_type, "ISA", 3)) { + p += scnprintf(p, left, "\tbase_address: %x\n", + info->params.interface_path.isa.base_address); + } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) || + !strncmp(info->params.host_bus_type, "PCI", 3)) { + p += scnprintf(p, left, + "\t%02x:%02x.%d channel: %u\n", + info->params.interface_path.pci.bus, + info->params.interface_path.pci.slot, + info->params.interface_path.pci.function, + info->params.interface_path.pci.channel); + } else if (!strncmp(info->params.host_bus_type, "IBND", 4) || + !strncmp(info->params.host_bus_type, "XPRS", 4) || + !strncmp(info->params.host_bus_type, "HTPT", 4)) { + p += scnprintf(p, left, + "\tTBD: %llx\n", + info->params.interface_path.ibnd.reserved); + + } else { + p += scnprintf(p, left, "\tunknown: %llx\n", + info->params.interface_path.unknown.reserved); + } + return (p - buf); +} + +static ssize_t +edd_show_interface(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + int i; + + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + for (i = 0; i < 8; i++) { + if (isprint(info->params.interface_type[i])) { + p += scnprintf(p, left, "%c", info->params.interface_type[i]); + } else { + p += scnprintf(p, left, " "); + } + } + if (!strncmp(info->params.interface_type, "ATAPI", 5)) { + p += scnprintf(p, left, "\tdevice: %u lun: %u\n", + info->params.device_path.atapi.device, + info->params.device_path.atapi.lun); + } else if (!strncmp(info->params.interface_type, "ATA", 3)) { + p += scnprintf(p, left, "\tdevice: %u\n", + info->params.device_path.ata.device); + } else if (!strncmp(info->params.interface_type, "SCSI", 4)) { + p += scnprintf(p, left, "\tid: %u lun: %llu\n", + info->params.device_path.scsi.id, + info->params.device_path.scsi.lun); + } else if (!strncmp(info->params.interface_type, "USB", 3)) { + p += scnprintf(p, left, "\tserial_number: %llx\n", + info->params.device_path.usb.serial_number); + } else if (!strncmp(info->params.interface_type, "1394", 4)) { + p += scnprintf(p, left, "\teui: %llx\n", + info->params.device_path.i1394.eui); + } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) { + p += scnprintf(p, left, "\twwid: %llx lun: %llx\n", + info->params.device_path.fibre.wwid, + info->params.device_path.fibre.lun); + } else if (!strncmp(info->params.interface_type, "I2O", 3)) { + p += scnprintf(p, left, "\tidentity_tag: %llx\n", + info->params.device_path.i2o.identity_tag); + } else if (!strncmp(info->params.interface_type, "RAID", 4)) { + p += scnprintf(p, left, "\tidentity_tag: %x\n", + info->params.device_path.raid.array_number); + } else if (!strncmp(info->params.interface_type, "SATA", 4)) { + p += scnprintf(p, left, "\tdevice: %u\n", + info->params.device_path.sata.device); + } else { + p += scnprintf(p, left, "\tunknown: %llx %llx\n", + info->params.device_path.unknown.reserved1, + info->params.device_path.unknown.reserved2); + } + + return (p - buf); +} + +/** + * edd_show_raw_data() - copies raw data to buffer for userspace to parse + * + * Returns: number of bytes written, or -EINVAL on failure + */ +static ssize_t +edd_show_raw_data(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + ssize_t len = sizeof (info->params); + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) + len = info->params.length; + + /* In case of buggy BIOSs */ + if (len > (sizeof(info->params))) + len = sizeof(info->params); + + memcpy(buf, &info->params, len); + return len; +} + +static ssize_t +edd_show_version(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += scnprintf(p, left, "0x%02x\n", info->version); + return (p - buf); +} + +static ssize_t +edd_show_mbr_signature(struct edd_device *edev, char *buf) +{ + char *p = buf; + p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature); + return (p - buf); +} + +static ssize_t +edd_show_extensions(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) { + p += scnprintf(p, left, "Fixed disk access\n"); + } + if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) { + p += scnprintf(p, left, "Device locking and ejecting\n"); + } + if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) { + p += scnprintf(p, left, "Enhanced Disk Drive support\n"); + } + if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) { + p += scnprintf(p, left, "64-bit extensions\n"); + } + return (p - buf); +} + +static ssize_t +edd_show_info_flags(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT) + p += scnprintf(p, left, "DMA boundary error transparent\n"); + if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID) + p += scnprintf(p, left, "geometry valid\n"); + if (info->params.info_flags & EDD_INFO_REMOVABLE) + p += scnprintf(p, left, "removable\n"); + if (info->params.info_flags & EDD_INFO_WRITE_VERIFY) + p += scnprintf(p, left, "write verify\n"); + if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION) + p += scnprintf(p, left, "media change notification\n"); + if (info->params.info_flags & EDD_INFO_LOCKABLE) + p += scnprintf(p, left, "lockable\n"); + if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT) + p += scnprintf(p, left, "no media present\n"); + if (info->params.info_flags & EDD_INFO_USE_INT13_FN50) + p += scnprintf(p, left, "use int13 fn50\n"); + return (p - buf); +} + +static ssize_t +edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += snprintf(p, left, "%u\n", info->legacy_max_cylinder); + return (p - buf); +} + +static ssize_t +edd_show_legacy_max_head(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += snprintf(p, left, "%u\n", info->legacy_max_head); + return (p - buf); +} + +static ssize_t +edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track); + return (p - buf); +} + +static ssize_t +edd_show_default_cylinders(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders); + return (p - buf); +} + +static ssize_t +edd_show_default_heads(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += scnprintf(p, left, "%u\n", info->params.num_default_heads); + return (p - buf); +} + +static ssize_t +edd_show_default_sectors_per_track(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += scnprintf(p, left, "%u\n", info->params.sectors_per_track); + return (p - buf); +} + +static ssize_t +edd_show_sectors(struct edd_device *edev, char *buf) +{ + struct edd_info *info; + char *p = buf; + if (!edev) + return -EINVAL; + info = edd_dev_get_info(edev); + if (!info || !buf) + return -EINVAL; + + p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors); + return (p - buf); +} + + +/* + * Some device instances may not have all the above attributes, + * or the attribute values may be meaningless (i.e. if + * the device is < EDD 3.0, it won't have host_bus and interface + * information), so don't bother making files for them. Likewise + * if the default_{cylinders,heads,sectors_per_track} values + * are zero, the BIOS doesn't provide sane values, don't bother + * creating files for them either. + */ + +static int +edd_has_legacy_max_cylinder(struct edd_device *edev) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + return info->legacy_max_cylinder > 0; +} + +static int +edd_has_legacy_max_head(struct edd_device *edev) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + return info->legacy_max_head > 0; +} + +static int +edd_has_legacy_sectors_per_track(struct edd_device *edev) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + return info->legacy_sectors_per_track > 0; +} + +static int +edd_has_default_cylinders(struct edd_device *edev) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + return info->params.num_default_cylinders > 0; +} + +static int +edd_has_default_heads(struct edd_device *edev) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + return info->params.num_default_heads > 0; +} + +static int +edd_has_default_sectors_per_track(struct edd_device *edev) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + return info->params.sectors_per_track > 0; +} + +static int +edd_has_edd30(struct edd_device *edev) +{ + struct edd_info *info; + int i, nonzero_path = 0; + char c; + + if (!edev) + return 0; + info = edd_dev_get_info(edev); + if (!info) + return 0; + + if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) { + return 0; + } + + for (i = 30; i <= 73; i++) { + c = *(((uint8_t *) info) + i + 4); + if (c) { + nonzero_path++; + break; + } + } + if (!nonzero_path) { + return 0; + } + + return 1; +} + + +static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info); +static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info); +static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info); +static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info); +static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info); +static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444, + edd_show_legacy_max_cylinder, + edd_has_legacy_max_cylinder); +static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head, + edd_has_legacy_max_head); +static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444, + edd_show_legacy_sectors_per_track, + edd_has_legacy_sectors_per_track); +static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders, + edd_has_default_cylinders); +static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads, + edd_has_default_heads); +static EDD_DEVICE_ATTR(default_sectors_per_track, 0444, + edd_show_default_sectors_per_track, + edd_has_default_sectors_per_track); +static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30); +static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30); +static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature); + + +/* These are default attributes that are added for every edd + * device discovered. There are none. + */ +static struct attribute * def_attrs[] = { + NULL, +}; + +/* These attributes are conditional and only added for some devices. */ +static struct edd_attribute * edd_attrs[] = { + &edd_attr_raw_data, + &edd_attr_version, + &edd_attr_extensions, + &edd_attr_info_flags, + &edd_attr_sectors, + &edd_attr_legacy_max_cylinder, + &edd_attr_legacy_max_head, + &edd_attr_legacy_sectors_per_track, + &edd_attr_default_cylinders, + &edd_attr_default_heads, + &edd_attr_default_sectors_per_track, + &edd_attr_interface, + &edd_attr_host_bus, + &edd_attr_mbr_signature, + NULL, +}; + +/** + * edd_release - free edd structure + * @kobj: kobject of edd structure + * + * This is called when the refcount of the edd structure + * reaches 0. This should happen right after we unregister, + * but just in case, we use the release callback anyway. + */ + +static void edd_release(struct kobject * kobj) +{ + struct edd_device * dev = to_edd_device(kobj); + kfree(dev); +} + +static struct kobj_type ktype_edd = { + .release = edd_release, + .sysfs_ops = &edd_attr_ops, + .default_attrs = def_attrs, +}; + +static decl_subsys(edd,&ktype_edd,NULL); + + +/** + * edd_dev_is_type() - is this EDD device a 'type' device? + * @edev + * @type - a host bus or interface identifier string per the EDD spec + * + * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise. + */ +static int +edd_dev_is_type(struct edd_device *edev, const char *type) +{ + struct edd_info *info; + if (!edev) + return 0; + info = edd_dev_get_info(edev); + + if (type && info) { + if (!strncmp(info->params.host_bus_type, type, strlen(type)) || + !strncmp(info->params.interface_type, type, strlen(type))) + return 1; + } + return 0; +} + +/** + * edd_get_pci_dev() - finds pci_dev that matches edev + * @edev - edd_device + * + * Returns pci_dev if found, or NULL + */ +static struct pci_dev * +edd_get_pci_dev(struct edd_device *edev) +{ + struct edd_info *info = edd_dev_get_info(edev); + + if (edd_dev_is_type(edev, "PCI")) { + return pci_find_slot(info->params.interface_path.pci.bus, + PCI_DEVFN(info->params.interface_path.pci.slot, + info->params.interface_path.pci. + function)); + } + return NULL; +} + +static int +edd_create_symlink_to_pcidev(struct edd_device *edev) +{ + + struct pci_dev *pci_dev = edd_get_pci_dev(edev); + if (!pci_dev) + return 1; + return sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev"); +} + +static inline void +edd_device_unregister(struct edd_device *edev) +{ + kobject_unregister(&edev->kobj); +} + +static void edd_populate_dir(struct edd_device * edev) +{ + struct edd_attribute * attr; + int error = 0; + int i; + + for (i = 0; (attr = edd_attrs[i]) && !error; i++) { + if (!attr->test || + (attr->test && attr->test(edev))) + error = sysfs_create_file(&edev->kobj,&attr->attr); + } + + if (!error) { + edd_create_symlink_to_pcidev(edev); + } +} + +static int +edd_device_register(struct edd_device *edev, int i) +{ + int error; + + if (!edev) + return 1; + memset(edev, 0, sizeof (*edev)); + edd_dev_set_info(edev, i); + kobject_set_name(&edev->kobj, "int13_dev%02x", + 0x80 + i); + kobj_set_kset_s(edev,edd_subsys); + error = kobject_register(&edev->kobj); + if (!error) + edd_populate_dir(edev); + return error; +} + +static inline int edd_num_devices(void) +{ + return max_t(unsigned char, + min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr), + min_t(unsigned char, EDDMAXNR, edd.edd_info_nr)); +} + +/** + * edd_init() - creates sysfs tree of EDD data + */ +static int __init +edd_init(void) +{ + unsigned int i; + int rc=0; + struct edd_device *edev; + + printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n", + EDD_VERSION, EDD_DATE, edd_num_devices()); + + if (!edd_num_devices()) { + printk(KERN_INFO "EDD information not available.\n"); + return 1; + } + + rc = firmware_register(&edd_subsys); + if (rc) + return rc; + + for (i = 0; i < edd_num_devices() && !rc; i++) { + edev = kmalloc(sizeof (*edev), GFP_KERNEL); + if (!edev) + return -ENOMEM; + + rc = edd_device_register(edev, i); + if (rc) { + kfree(edev); + break; + } + edd_devices[i] = edev; + } + + if (rc) + firmware_unregister(&edd_subsys); + return rc; +} + +static void __exit +edd_exit(void) +{ + int i; + struct edd_device *edev; + + for (i = 0; i < edd_num_devices(); i++) { + if ((edev = edd_devices[i])) + edd_device_unregister(edev); + } + firmware_unregister(&edd_subsys); +} + +late_initcall(edd_init); +module_exit(edd_exit); diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c new file mode 100644 index 000000000000..0287ff65963b --- /dev/null +++ b/drivers/firmware/efivars.c @@ -0,0 +1,781 @@ +/* + * EFI Variables - efivars.c + * + * Copyright (C) 2001,2003,2004 Dell + * Copyright (C) 2004 Intel Corporation + * + * This code takes all variables accessible from EFI runtime and + * exports them via sysfs + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Changelog: + * + * 17 May 2004 - Matt Domsch + * remove check for efi_enabled in exit + * add MODULE_VERSION + * + * 26 Apr 2004 - Matt Domsch + * minor bug fixes + * + * 21 Apr 2004 - Matt Tolentino + * fix locking per Peter Chubb's findings + * + * 25 Mar 2002 - Matt Domsch + * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() + * + * 12 Feb 2002 - Matt Domsch + * use list_for_each_safe when deleting vars. + * remove ifdef CONFIG_SMP around include + * v0.04 release to linux-ia64@linuxia64.org + * + * 20 April 2001 - Matt Domsch + * Moved vars from /proc/efi to /proc/efi/vars, and made + * efi.c own the /proc/efi directory. + * v0.03 release to linux-ia64@linuxia64.org + * + * 26 March 2001 - Matt Domsch + * At the request of Stephane, moved ownership of /proc/efi + * to efi.c, and now efivars lives under /proc/efi/vars. + * + * 12 March 2001 - Matt Domsch + * Feedback received from Stephane Eranian incorporated. + * efivar_write() checks copy_from_user() return value. + * efivar_read/write() returns proper errno. + * v0.02 release to linux-ia64@linuxia64.org + * + * 26 February 2001 - Matt Domsch + * v0.01 release to linux-ia64@linuxia64.org + */ + +#include +#include +#include +#include +#include /* for capable() */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define EFIVARS_VERSION "0.08" +#define EFIVARS_DATE "2004-May-17" + +MODULE_AUTHOR("Matt Domsch "); +MODULE_DESCRIPTION("sysfs interface to EFI Variables"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(EFIVARS_VERSION); + +/* + * efivars_lock protects two things: + * 1) efivar_list - adds, removals, reads, writes + * 2) efi.[gs]et_variable() calls. + * It must not be held when creating sysfs entries or calling kmalloc. + * efi.get_next_variable() is only called from efivars_init(), + * which is protected by the BKL, so that path is safe. + */ +static DEFINE_SPINLOCK(efivars_lock); +static LIST_HEAD(efivar_list); + +/* + * The maximum size of VariableName + Data = 1024 + * Therefore, it's reasonable to save that much + * space in each part of the structure, + * and we use a page for reading/writing. + */ + +struct efi_variable { + efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; + efi_guid_t VendorGuid; + unsigned long DataSize; + __u8 Data[1024]; + efi_status_t Status; + __u32 Attributes; +} __attribute__((packed)); + + +struct efivar_entry { + struct efi_variable var; + struct list_head list; + struct kobject kobj; +}; + +#define get_efivar_entry(n) list_entry(n, struct efivar_entry, list) + +struct efivar_attribute { + struct attribute attr; + ssize_t (*show) (struct efivar_entry *entry, char *buf); + ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); +}; + + +#define EFI_ATTR(_name, _mode, _show, _store) \ +struct subsys_attribute efi_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ + .show = _show, \ + .store = _store, \ +}; + +#define EFIVAR_ATTR(_name, _mode, _show, _store) \ +struct efivar_attribute efivar_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ + .show = _show, \ + .store = _store, \ +}; + +#define VAR_SUBSYS_ATTR(_name, _mode, _show, _store) \ +struct subsys_attribute var_subsys_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE}, \ + .show = _show, \ + .store = _store, \ +}; + +#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) +#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) + +/* + * Prototype for sysfs creation function + */ +static int +efivar_create_sysfs_entry(unsigned long variable_name_size, + efi_char16_t *variable_name, + efi_guid_t *vendor_guid); + +/* Return the number of unicode characters in data */ +static unsigned long +utf8_strlen(efi_char16_t *data, unsigned long maxlength) +{ + unsigned long length = 0; + + while (*data++ != 0 && length < maxlength) + length++; + return length; +} + +/* + * Return the number of bytes is the length of this string + * Note: this is NOT the same as the number of unicode characters + */ +static inline unsigned long +utf8_strsize(efi_char16_t *data, unsigned long maxlength) +{ + return utf8_strlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); +} + +static efi_status_t +get_var_data(struct efi_variable *var) +{ + efi_status_t status; + + spin_lock(&efivars_lock); + var->DataSize = 1024; + status = efi.get_variable(var->VariableName, + &var->VendorGuid, + &var->Attributes, + &var->DataSize, + var->Data); + spin_unlock(&efivars_lock); + if (status != EFI_SUCCESS) { + printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", + status); + } + return status; +} + +static ssize_t +efivar_guid_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + + if (!entry || !buf) + return 0; + + efi_guid_unparse(&var->VendorGuid, str); + str += strlen(str); + str += sprintf(str, "\n"); + + return str - buf; +} + +static ssize_t +efivar_attr_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + efi_status_t status; + + if (!entry || !buf) + return -EINVAL; + + status = get_var_data(var); + if (status != EFI_SUCCESS) + return -EIO; + + if (var->Attributes & 0x1) + str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); + if (var->Attributes & 0x2) + str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); + if (var->Attributes & 0x4) + str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); + return str - buf; +} + +static ssize_t +efivar_size_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + efi_status_t status; + + if (!entry || !buf) + return -EINVAL; + + status = get_var_data(var); + if (status != EFI_SUCCESS) + return -EIO; + + str += sprintf(str, "0x%lx\n", var->DataSize); + return str - buf; +} + +static ssize_t +efivar_data_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + efi_status_t status; + + if (!entry || !buf) + return -EINVAL; + + status = get_var_data(var); + if (status != EFI_SUCCESS) + return -EIO; + + memcpy(buf, var->Data, var->DataSize); + return var->DataSize; +} +/* + * We allow each variable to be edited via rewriting the + * entire efi variable structure. + */ +static ssize_t +efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) +{ + struct efi_variable *new_var, *var = &entry->var; + efi_status_t status = EFI_NOT_FOUND; + + if (count != sizeof(struct efi_variable)) + return -EINVAL; + + new_var = (struct efi_variable *)buf; + /* + * If only updating the variable data, then the name + * and guid should remain the same + */ + if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || + efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { + printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); + return -EINVAL; + } + + if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ + printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); + return -EINVAL; + } + + spin_lock(&efivars_lock); + status = efi.set_variable(new_var->VariableName, + &new_var->VendorGuid, + new_var->Attributes, + new_var->DataSize, + new_var->Data); + + spin_unlock(&efivars_lock); + + if (status != EFI_SUCCESS) { + printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", + status); + return -EIO; + } + + memcpy(&entry->var, new_var, count); + return count; +} + +static ssize_t +efivar_show_raw(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + efi_status_t status; + + if (!entry || !buf) + return 0; + + status = get_var_data(var); + if (status != EFI_SUCCESS) + return -EIO; + + memcpy(buf, var, sizeof(*var)); + return sizeof(*var); +} + +/* + * Generic read/write functions that call the specific functions of + * the atttributes... + */ +static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + struct efivar_attribute *efivar_attr = to_efivar_attr(attr); + ssize_t ret = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (efivar_attr->show) { + ret = efivar_attr->show(var, buf); + } + return ret; +} + +static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + struct efivar_attribute *efivar_attr = to_efivar_attr(attr); + ssize_t ret = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (efivar_attr->store) + ret = efivar_attr->store(var, buf, count); + + return ret; +} + +static struct sysfs_ops efivar_attr_ops = { + .show = efivar_attr_show, + .store = efivar_attr_store, +}; + +static void efivar_release(struct kobject *kobj) +{ + struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); + spin_lock(&efivars_lock); + list_del(&var->list); + spin_unlock(&efivars_lock); + kfree(var); +} + +static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); +static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); +static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); +static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); +static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); + +static struct attribute *def_attrs[] = { + &efivar_attr_guid.attr, + &efivar_attr_size.attr, + &efivar_attr_attributes.attr, + &efivar_attr_data.attr, + &efivar_attr_raw_var.attr, + NULL, +}; + +static struct kobj_type ktype_efivar = { + .release = efivar_release, + .sysfs_ops = &efivar_attr_ops, + .default_attrs = def_attrs, +}; + +static ssize_t +dummy(struct subsystem *sub, char *buf) +{ + return -ENODEV; +} + +static inline void +efivar_unregister(struct efivar_entry *var) +{ + kobject_unregister(&var->kobj); +} + + +static ssize_t +efivar_create(struct subsystem *sub, const char *buf, size_t count) +{ + struct efi_variable *new_var = (struct efi_variable *)buf; + struct efivar_entry *search_efivar = NULL; + unsigned long strsize1, strsize2; + struct list_head *pos, *n; + efi_status_t status = EFI_NOT_FOUND; + int found = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + spin_lock(&efivars_lock); + + /* + * Does this variable already exist? + */ + list_for_each_safe(pos, n, &efivar_list) { + search_efivar = get_efivar_entry(pos); + strsize1 = utf8_strsize(search_efivar->var.VariableName, 1024); + strsize2 = utf8_strsize(new_var->VariableName, 1024); + if (strsize1 == strsize2 && + !memcmp(&(search_efivar->var.VariableName), + new_var->VariableName, strsize1) && + !efi_guidcmp(search_efivar->var.VendorGuid, + new_var->VendorGuid)) { + found = 1; + break; + } + } + if (found) { + spin_unlock(&efivars_lock); + return -EINVAL; + } + + /* now *really* create the variable via EFI */ + status = efi.set_variable(new_var->VariableName, + &new_var->VendorGuid, + new_var->Attributes, + new_var->DataSize, + new_var->Data); + + if (status != EFI_SUCCESS) { + printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", + status); + spin_unlock(&efivars_lock); + return -EIO; + } + spin_unlock(&efivars_lock); + + /* Create the entry in sysfs. Locking is not required here */ + status = efivar_create_sysfs_entry(utf8_strsize(new_var->VariableName, + 1024), new_var->VariableName, &new_var->VendorGuid); + if (status) { + printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); + } + return count; +} + +static ssize_t +efivar_delete(struct subsystem *sub, const char *buf, size_t count) +{ + struct efi_variable *del_var = (struct efi_variable *)buf; + struct efivar_entry *search_efivar = NULL; + unsigned long strsize1, strsize2; + struct list_head *pos, *n; + efi_status_t status = EFI_NOT_FOUND; + int found = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + spin_lock(&efivars_lock); + + /* + * Does this variable already exist? + */ + list_for_each_safe(pos, n, &efivar_list) { + search_efivar = get_efivar_entry(pos); + strsize1 = utf8_strsize(search_efivar->var.VariableName, 1024); + strsize2 = utf8_strsize(del_var->VariableName, 1024); + if (strsize1 == strsize2 && + !memcmp(&(search_efivar->var.VariableName), + del_var->VariableName, strsize1) && + !efi_guidcmp(search_efivar->var.VendorGuid, + del_var->VendorGuid)) { + found = 1; + break; + } + } + if (!found) { + spin_unlock(&efivars_lock); + return -EINVAL; + } + /* force the Attributes/DataSize to 0 to ensure deletion */ + del_var->Attributes = 0; + del_var->DataSize = 0; + + status = efi.set_variable(del_var->VariableName, + &del_var->VendorGuid, + del_var->Attributes, + del_var->DataSize, + del_var->Data); + + if (status != EFI_SUCCESS) { + printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", + status); + spin_unlock(&efivars_lock); + return -EIO; + } + /* We need to release this lock before unregistering. */ + spin_unlock(&efivars_lock); + + efivar_unregister(search_efivar); + + /* It's dead Jim.... */ + return count; +} + +static VAR_SUBSYS_ATTR(new_var, 0200, dummy, efivar_create); +static VAR_SUBSYS_ATTR(del_var, 0200, dummy, efivar_delete); + +static struct subsys_attribute *var_subsys_attrs[] = { + &var_subsys_attr_new_var, + &var_subsys_attr_del_var, + NULL, +}; + +/* + * Let's not leave out systab information that snuck into + * the efivars driver + */ +static ssize_t +systab_read(struct subsystem *entry, char *buf) +{ + char *str = buf; + + if (!entry || !buf) + return -EINVAL; + + if (efi.mps) + str += sprintf(str, "MPS=0x%lx\n", __pa(efi.mps)); + if (efi.acpi20) + str += sprintf(str, "ACPI20=0x%lx\n", __pa(efi.acpi20)); + if (efi.acpi) + str += sprintf(str, "ACPI=0x%lx\n", __pa(efi.acpi)); + if (efi.smbios) + str += sprintf(str, "SMBIOS=0x%lx\n", __pa(efi.smbios)); + if (efi.hcdp) + str += sprintf(str, "HCDP=0x%lx\n", __pa(efi.hcdp)); + if (efi.boot_info) + str += sprintf(str, "BOOTINFO=0x%lx\n", __pa(efi.boot_info)); + if (efi.uga) + str += sprintf(str, "UGA=0x%lx\n", __pa(efi.uga)); + + return str - buf; +} + +static EFI_ATTR(systab, 0400, systab_read, NULL); + +static struct subsys_attribute *efi_subsys_attrs[] = { + &efi_attr_systab, + NULL, /* maybe more in the future? */ +}; + +static decl_subsys(vars, &ktype_efivar, NULL); +static decl_subsys(efi, NULL, NULL); + +/* + * efivar_create_sysfs_entry() + * Requires: + * variable_name_size = number of bytes required to hold + * variable_name (not counting the NULL + * character at the end. + * efivars_lock is not held on entry or exit. + * Returns 1 on failure, 0 on success + */ +static int +efivar_create_sysfs_entry(unsigned long variable_name_size, + efi_char16_t *variable_name, + efi_guid_t *vendor_guid) +{ + int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; + char *short_name; + struct efivar_entry *new_efivar; + + short_name = kmalloc(short_name_size + 1, GFP_KERNEL); + new_efivar = kmalloc(sizeof(struct efivar_entry), GFP_KERNEL); + + if (!short_name || !new_efivar) { + if (short_name) kfree(short_name); + if (new_efivar) kfree(new_efivar); + return 1; + } + memset(short_name, 0, short_name_size+1); + memset(new_efivar, 0, sizeof(struct efivar_entry)); + + memcpy(new_efivar->var.VariableName, variable_name, + variable_name_size); + memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); + + /* Convert Unicode to normal chars (assume top bits are 0), + ala UTF-8 */ + for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { + short_name[i] = variable_name[i] & 0xFF; + } + /* This is ugly, but necessary to separate one vendor's + private variables from another's. */ + + *(short_name + strlen(short_name)) = '-'; + efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); + + kobject_set_name(&new_efivar->kobj, "%s", short_name); + kobj_set_kset_s(new_efivar, vars_subsys); + kobject_register(&new_efivar->kobj); + + kfree(short_name); short_name = NULL; + + spin_lock(&efivars_lock); + list_add(&new_efivar->list, &efivar_list); + spin_unlock(&efivars_lock); + + return 0; +} +/* + * For now we register the efi subsystem with the firmware subsystem + * and the vars subsystem with the efi subsystem. In the future, it + * might make sense to split off the efi subsystem into its own + * driver, but for now only efivars will register with it, so just + * include it here. + */ + +static int __init +efivars_init(void) +{ + efi_status_t status = EFI_NOT_FOUND; + efi_guid_t vendor_guid; + efi_char16_t *variable_name; + struct subsys_attribute *attr; + unsigned long variable_name_size = 1024; + int i, error = 0; + + if (!efi_enabled) + return -ENODEV; + + variable_name = kmalloc(variable_name_size, GFP_KERNEL); + if (!variable_name) { + printk(KERN_ERR "efivars: Memory allocation failed.\n"); + return -ENOMEM; + } + + memset(variable_name, 0, variable_name_size); + + printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, + EFIVARS_DATE); + + /* + * For now we'll register the efi subsys within this driver + */ + + error = firmware_register(&efi_subsys); + + if (error) { + printk(KERN_ERR "efivars: Firmware registration failed with error %d.\n", error); + goto out_free; + } + + kset_set_kset_s(&vars_subsys, efi_subsys); + + error = subsystem_register(&vars_subsys); + + if (error) { + printk(KERN_ERR "efivars: Subsystem registration failed with error %d.\n", error); + goto out_firmware_unregister; + } + + /* + * Per EFI spec, the maximum storage allocated for both + * the variable name and variable data is 1024 bytes. + */ + + do { + variable_name_size = 1024; + + status = efi.get_next_variable(&variable_name_size, + variable_name, + &vendor_guid); + switch (status) { + case EFI_SUCCESS: + efivar_create_sysfs_entry(variable_name_size, + variable_name, + &vendor_guid); + break; + case EFI_NOT_FOUND: + break; + default: + printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", + status); + status = EFI_NOT_FOUND; + break; + } + } while (status != EFI_NOT_FOUND); + + /* + * Now add attributes to allow creation of new vars + * and deletion of existing ones... + */ + + for (i = 0; (attr = var_subsys_attrs[i]) && !error; i++) { + if (attr->show && attr->store) + error = subsys_create_file(&vars_subsys, attr); + } + + /* Don't forget the systab entry */ + + for (i = 0; (attr = efi_subsys_attrs[i]) && !error; i++) { + if (attr->show) + error = subsys_create_file(&efi_subsys, attr); + } + + if (error) + printk(KERN_ERR "efivars: Sysfs attribute export failed with error %d.\n", error); + else + goto out_free; + + subsystem_unregister(&vars_subsys); + +out_firmware_unregister: + firmware_unregister(&efi_subsys); + +out_free: + kfree(variable_name); + + return error; +} + +static void __exit +efivars_exit(void) +{ + struct list_head *pos, *n; + + list_for_each_safe(pos, n, &efivar_list) + efivar_unregister(get_efivar_entry(pos)); + + subsystem_unregister(&vars_subsys); + firmware_unregister(&efi_subsys); +} + +module_init(efivars_init); +module_exit(efivars_exit); + diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c new file mode 100644 index 000000000000..6d5df6c2efa2 --- /dev/null +++ b/drivers/firmware/pcdp.c @@ -0,0 +1,100 @@ +/* + * Parse the EFI PCDP table to locate the console device. + * + * (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P. + * Khalid Aziz + * Alex Williamson + * Bjorn Helgaas + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include "pcdp.h" + +static int __init +setup_serial_console(struct pcdp_uart *uart) +{ +#ifdef CONFIG_SERIAL_8250_CONSOLE + int mmio; + static char options[64]; + + mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY); + snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d", + mmio ? "mmio" : "io", uart->addr.address, uart->baud, + uart->bits ? uart->bits : 8); + + return early_serial_console_init(options); +#else + return -ENODEV; +#endif +} + +static int __init +setup_vga_console(struct pcdp_vga *vga) +{ +#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) + if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) { + printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n"); + return -ENODEV; + } + + conswitchp = &vga_con; + printk(KERN_INFO "PCDP: VGA console\n"); + return 0; +#else + return -ENODEV; +#endif +} + +int __init +efi_setup_pcdp_console(char *cmdline) +{ + struct pcdp *pcdp; + struct pcdp_uart *uart; + struct pcdp_device *dev, *end; + int i, serial = 0; + + pcdp = efi.hcdp; + if (!pcdp) + return -ENODEV; + + printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp)); + + if (strstr(cmdline, "console=hcdp")) { + if (pcdp->rev < 3) + serial = 1; + } else if (strstr(cmdline, "console=")) { + printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n"); + return -ENODEV; + } + + if (pcdp->rev < 3 && efi_uart_console_only()) + serial = 1; + + for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) { + if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) { + if (uart->type == PCDP_CONSOLE_UART) { + return setup_serial_console(uart); + } + } + } + + end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length); + for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts); + dev < end; + dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) { + if (dev->flags & PCDP_PRIMARY_CONSOLE) { + if (dev->type == PCDP_CONSOLE_VGA) { + return setup_vga_console((struct pcdp_vga *) dev); + } + } + } + + return -ENODEV; +} diff --git a/drivers/firmware/pcdp.h b/drivers/firmware/pcdp.h new file mode 100644 index 000000000000..863bb6f768c3 --- /dev/null +++ b/drivers/firmware/pcdp.h @@ -0,0 +1,84 @@ +/* + * Definitions for PCDP-defined console devices + * + * v1.0a: http://www.dig64.org/specifications/DIG64_HCDPv10a_01.pdf + * v2.0: http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf + * + * (c) Copyright 2002, 2004 Hewlett-Packard Development Company, L.P. + * Khalid Aziz + * Bjorn Helgaas + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define PCDP_CONSOLE 0 +#define PCDP_DEBUG 1 +#define PCDP_CONSOLE_OUTPUT 2 +#define PCDP_CONSOLE_INPUT 3 + +#define PCDP_UART (0 << 3) +#define PCDP_VGA (1 << 3) +#define PCDP_USB (2 << 3) + +/* pcdp_uart.type and pcdp_device.type */ +#define PCDP_CONSOLE_UART (PCDP_UART | PCDP_CONSOLE) +#define PCDP_DEBUG_UART (PCDP_UART | PCDP_DEBUG) +#define PCDP_CONSOLE_VGA (PCDP_VGA | PCDP_CONSOLE_OUTPUT) +#define PCDP_CONSOLE_USB (PCDP_USB | PCDP_CONSOLE_INPUT) + +/* pcdp_uart.flags */ +#define PCDP_UART_EDGE_SENSITIVE (1 << 0) +#define PCDP_UART_ACTIVE_LOW (1 << 1) +#define PCDP_UART_PRIMARY_CONSOLE (1 << 2) +#define PCDP_UART_IRQ (1 << 6) /* in pci_func for rev < 3 */ +#define PCDP_UART_PCI (1 << 7) /* in pci_func for rev < 3 */ + +struct pcdp_uart { + u8 type; + u8 bits; + u8 parity; + u8 stop_bits; + u8 pci_seg; + u8 pci_bus; + u8 pci_dev; + u8 pci_func; + u64 baud; + struct acpi_generic_address addr; + u16 pci_dev_id; + u16 pci_vendor_id; + u32 gsi; + u32 clock_rate; + u8 pci_prog_intfc; + u8 flags; +}; + +struct pcdp_vga { + u8 count; /* address space descriptors */ +}; + +/* pcdp_device.flags */ +#define PCDP_PRIMARY_CONSOLE 1 + +struct pcdp_device { + u8 type; + u8 flags; + u16 length; + u16 efi_index; +}; + +struct pcdp { + u8 signature[4]; + u32 length; + u8 rev; /* PCDP v2.0 is rev 3 */ + u8 chksum; + u8 oemid[6]; + u8 oem_tabid[8]; + u32 oem_rev; + u8 creator_id[4]; + u32 creator_rev; + u32 num_uarts; + struct pcdp_uart uart[0]; /* actual size is num_uarts */ + /* remainder of table is pcdp_device structures */ +}; -- cgit v1.2.3-59-g8ed1b