diff options
Diffstat (limited to 'arch/loongarch/kernel/setup.c')
| -rw-r--r-- | arch/loongarch/kernel/setup.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c new file mode 100644 index 000000000000..185e4035811a --- /dev/null +++ b/arch/loongarch/kernel/setup.c @@ -0,0 +1,374 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + * + * Derived from MIPS: + * Copyright (C) 1995 Linus Torvalds + * Copyright (C) 1995 Waldorf Electronics + * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle + * Copyright (C) 1996 Stoned Elipot + * Copyright (C) 1999 Silicon Graphics, Inc. + * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki + */ +#include <linux/init.h> +#include <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/efi.h> +#include <linux/export.h> +#include <linux/screen_info.h> +#include <linux/memblock.h> +#include <linux/initrd.h> +#include <linux/ioport.h> +#include <linux/root_dev.h> +#include <linux/console.h> +#include <linux/pfn.h> +#include <linux/platform_device.h> +#include <linux/sizes.h> +#include <linux/device.h> +#include <linux/dma-map-ops.h> +#include <linux/swiotlb.h> + +#include <asm/addrspace.h> +#include <asm/bootinfo.h> +#include <asm/cache.h> +#include <asm/cpu.h> +#include <asm/dma.h> +#include <asm/efi.h> +#include <asm/loongson.h> +#include <asm/numa.h> +#include <asm/pgalloc.h> +#include <asm/sections.h> +#include <asm/setup.h> +#include <asm/smp.h> +#include <asm/time.h> + +#define SMBIOS_BIOSSIZE_OFFSET 0x09 +#define SMBIOS_BIOSEXTERN_OFFSET 0x13 +#define SMBIOS_FREQLOW_OFFSET 0x16 +#define SMBIOS_FREQHIGH_OFFSET 0x17 +#define SMBIOS_FREQLOW_MASK 0xFF +#define SMBIOS_CORE_PACKAGE_OFFSET 0x23 +#define LOONGSON_EFI_ENABLE (1 << 3) + +#ifdef CONFIG_VT +struct screen_info screen_info; +#endif + +unsigned long fw_arg0, fw_arg1; +DEFINE_PER_CPU(unsigned long, kernelsp); +struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly; + +EXPORT_SYMBOL(cpu_data); + +struct loongson_board_info b_info; +static const char dmi_empty_string[] = " "; + +/* + * Setup information + * + * These are initialized so they are in the .data section + */ + +static int num_standard_resources; +static struct resource *standard_resources; + +static struct resource code_resource = { .name = "Kernel code", }; +static struct resource data_resource = { .name = "Kernel data", }; +static struct resource bss_resource = { .name = "Kernel bss", }; + +const char *get_system_type(void) +{ + return "generic-loongson-machine"; +} + +static const char *dmi_string_parse(const struct dmi_header *dm, u8 s) +{ + const u8 *bp = ((u8 *) dm) + dm->length; + + if (s) { + s--; + while (s > 0 && *bp) { + bp += strlen(bp) + 1; + s--; + } + + if (*bp != 0) { + size_t len = strlen(bp)+1; + size_t cmp_len = len > 8 ? 8 : len; + + if (!memcmp(bp, dmi_empty_string, cmp_len)) + return dmi_empty_string; + + return bp; + } + } + + return ""; +} + +static void __init parse_cpu_table(const struct dmi_header *dm) +{ + long freq_temp = 0; + char *dmi_data = (char *)dm; + + freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) + + ((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK)); + cpu_clock_freq = freq_temp * 1000000; + + loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]); + loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET); + + pr_info("CpuClock = %llu\n", cpu_clock_freq); +} + +static void __init parse_bios_table(const struct dmi_header *dm) +{ + int bios_extern; + char *dmi_data = (char *)dm; + + bios_extern = *(dmi_data + SMBIOS_BIOSEXTERN_OFFSET); + b_info.bios_size = *(dmi_data + SMBIOS_BIOSSIZE_OFFSET); + + if (bios_extern & LOONGSON_EFI_ENABLE) + set_bit(EFI_BOOT, &efi.flags); + else + clear_bit(EFI_BOOT, &efi.flags); +} + +static void __init find_tokens(const struct dmi_header *dm, void *dummy) +{ + switch (dm->type) { + case 0x0: /* Extern BIOS */ + parse_bios_table(dm); + break; + case 0x4: /* Calling interface */ + parse_cpu_table(dm); + break; + } +} +static void __init smbios_parse(void) +{ + b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR); + b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION); + b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE); + b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR); + b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME); + dmi_walk(find_tokens, NULL); +} + +static int usermem __initdata; + +static int __init early_parse_mem(char *p) +{ + phys_addr_t start, size; + + if (!p) { + pr_err("mem parameter is empty, do nothing\n"); + return -EINVAL; + } + + /* + * If a user specifies memory size, we + * blow away any automatically generated + * size. + */ + if (usermem == 0) { + usermem = 1; + memblock_remove(memblock_start_of_DRAM(), + memblock_end_of_DRAM() - memblock_start_of_DRAM()); + } + start = 0; + size = memparse(p, &p); + if (*p == '@') + start = memparse(p + 1, &p); + else { + pr_err("Invalid format!\n"); + return -EINVAL; + } + + if (!IS_ENABLED(CONFIG_NUMA)) + memblock_add(start, size); + else + memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); + + return 0; +} +early_param("mem", early_parse_mem); + +void __init platform_init(void) +{ + efi_init(); +#ifdef CONFIG_ACPI_TABLE_UPGRADE + acpi_table_upgrade(); +#endif +#ifdef CONFIG_ACPI + acpi_gbl_use_default_register_widths = false; + acpi_boot_table_init(); + acpi_boot_init(); +#endif + +#ifdef CONFIG_NUMA + init_numa_memory(); +#endif + dmi_setup(); + smbios_parse(); + pr_info("The BIOS Version: %s\n", b_info.bios_version); + + efi_runtime_init(); +} + +static void __init check_kernel_sections_mem(void) +{ + phys_addr_t start = __pa_symbol(&_text); + phys_addr_t size = __pa_symbol(&_end) - start; + + if (!memblock_is_region_memory(start, size)) { + pr_info("Kernel sections are not in the memory maps\n"); + memblock_add(start, size); + } +} + +/* + * arch_mem_init - initialize memory management subsystem + */ +static void __init arch_mem_init(char **cmdline_p) +{ + if (usermem) + pr_info("User-defined physical RAM map overwrite\n"); + + check_kernel_sections_mem(); + + /* + * In order to reduce the possibility of kernel panic when failed to + * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate + * low memory as small as possible before plat_swiotlb_setup(), so + * make sparse_init() using top-down allocation. + */ + memblock_set_bottom_up(false); + sparse_init(); + memblock_set_bottom_up(true); + + plat_swiotlb_setup(); + + dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); + + memblock_dump_all(); + + early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); +} + +static void __init resource_init(void) +{ + long i = 0; + size_t res_size; + struct resource *res; + struct memblock_region *region; + + code_resource.start = __pa_symbol(&_text); + code_resource.end = __pa_symbol(&_etext) - 1; + data_resource.start = __pa_symbol(&_etext); + data_resource.end = __pa_symbol(&_edata) - 1; + bss_resource.start = __pa_symbol(&__bss_start); + bss_resource.end = __pa_symbol(&__bss_stop) - 1; + + num_standard_resources = memblock.memory.cnt; + res_size = num_standard_resources * sizeof(*standard_resources); + standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES); + + for_each_mem_region(region) { + res = &standard_resources[i++]; + if (!memblock_is_nomap(region)) { + res->name = "System RAM"; + res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; + } else { + res->name = "Reserved"; + res->flags = IORESOURCE_MEM; + res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1; + } + + request_resource(&iomem_resource, res); + + /* + * We don't know which RAM region contains kernel data, + * so we try it repeatedly and let the resource manager + * test it. + */ + request_resource(res, &code_resource); + request_resource(res, &data_resource); + request_resource(res, &bss_resource); + } +} + +static int __init reserve_memblock_reserved_regions(void) +{ + u64 i, j; + + for (i = 0; i < num_standard_resources; ++i) { + struct resource *mem = &standard_resources[i]; + phys_addr_t r_start, r_end, mem_size = resource_size(mem); + + if (!memblock_is_region_reserved(mem->start, mem_size)) + continue; + + for_each_reserved_mem_range(j, &r_start, &r_end) { + resource_size_t start, end; + + start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start); + end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end); + + if (start > mem->end || end < mem->start) + continue; + + reserve_region_with_split(mem, start, end, "Reserved"); + } + } + + return 0; +} +arch_initcall(reserve_memblock_reserved_regions); + +#ifdef CONFIG_SMP +static void __init prefill_possible_map(void) +{ + int i, possible; + + possible = num_processors + disabled_cpus; + if (possible > nr_cpu_ids) + possible = nr_cpu_ids; + + pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n", + possible, max((possible - num_processors), 0)); + + for (i = 0; i < possible; i++) + set_cpu_possible(i, true); + for (; i < NR_CPUS; i++) + set_cpu_possible(i, false); + + nr_cpu_ids = possible; +} +#else +static inline void prefill_possible_map(void) {} +#endif + +void __init setup_arch(char **cmdline_p) +{ + cpu_probe(); + *cmdline_p = boot_command_line; + + init_environ(); + memblock_init(); + parse_early_param(); + + platform_init(); + pagetable_init(); + arch_mem_init(cmdline_p); + + resource_init(); + plat_smp_setup(); + prefill_possible_map(); + + paging_init(); +} |