diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/efi/efi.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 5145fa344ad5..2e2fbdec0845 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -13,11 +13,27 @@ * This file is released under the GPLv2. */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/kobject.h> #include <linux/module.h> #include <linux/init.h> #include <linux/device.h> #include <linux/efi.h> +#include <linux/io.h> + +struct efi __read_mostly efi = { + .mps = EFI_INVALID_TABLE_ADDR, + .acpi = EFI_INVALID_TABLE_ADDR, + .acpi20 = EFI_INVALID_TABLE_ADDR, + .smbios = EFI_INVALID_TABLE_ADDR, + .sal_systab = EFI_INVALID_TABLE_ADDR, + .boot_info = EFI_INVALID_TABLE_ADDR, + .hcdp = EFI_INVALID_TABLE_ADDR, + .uga = EFI_INVALID_TABLE_ADDR, + .uv_systab = EFI_INVALID_TABLE_ADDR, +}; +EXPORT_SYMBOL(efi); static struct kobject *efi_kobj; static struct kobject *efivars_kobj; @@ -132,3 +148,127 @@ err_put: } subsys_initcall(efisubsys_init); + + +/* + * We can't ioremap data in EFI boot services RAM, because we've already mapped + * it as RAM. So, look it up in the existing EFI memory map instead. Only + * callable after efi_enter_virtual_mode and before efi_free_boot_services. + */ +void __iomem *efi_lookup_mapped_addr(u64 phys_addr) +{ + struct efi_memory_map *map; + void *p; + map = efi.memmap; + if (!map) + return NULL; + if (WARN_ON(!map->map)) + return NULL; + for (p = map->map; p < map->map_end; p += map->desc_size) { + efi_memory_desc_t *md = p; + u64 size = md->num_pages << EFI_PAGE_SHIFT; + u64 end = md->phys_addr + size; + if (!(md->attribute & EFI_MEMORY_RUNTIME) && + md->type != EFI_BOOT_SERVICES_CODE && + md->type != EFI_BOOT_SERVICES_DATA) + continue; + if (!md->virt_addr) + continue; + if (phys_addr >= md->phys_addr && phys_addr < end) { + phys_addr += md->virt_addr - md->phys_addr; + return (__force void __iomem *)(unsigned long)phys_addr; + } + } + return NULL; +} + +static __initdata efi_config_table_type_t common_tables[] = { + {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}, + {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab}, + {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios}, + {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga}, + {NULL_GUID, NULL, 0}, +}; + +static __init int match_config_table(efi_guid_t *guid, + unsigned long table, + efi_config_table_type_t *table_types) +{ + u8 str[EFI_VARIABLE_GUID_LEN + 1]; + int i; + + if (table_types) { + efi_guid_unparse(guid, str); + + for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) { + efi_guid_unparse(&table_types[i].guid, str); + + if (!efi_guidcmp(*guid, table_types[i].guid)) { + *(table_types[i].ptr) = table; + pr_cont(" %s=0x%lx ", + table_types[i].name, table); + return 1; + } + } + } + + return 0; +} + +int __init efi_config_init(efi_config_table_type_t *arch_tables) +{ + void *config_tables, *tablep; + int i, sz; + + if (efi_enabled(EFI_64BIT)) + sz = sizeof(efi_config_table_64_t); + else + sz = sizeof(efi_config_table_32_t); + + /* + * 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; + } + + tablep = config_tables; + pr_info(""); + for (i = 0; i < efi.systab->nr_tables; 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) { + pr_cont("\n"); + pr_err("Table located above 4GB, disabling EFI.\n"); + early_iounmap(config_tables, + efi.systab->nr_tables * sz); + return -EINVAL; + } +#endif + } else { + guid = ((efi_config_table_32_t *)tablep)->guid; + table = ((efi_config_table_32_t *)tablep)->table; + } + + if (!match_config_table(&guid, table, common_tables)) + match_config_table(&guid, table, arch_tables); + + tablep += sz; + } + pr_cont("\n"); + early_iounmap(config_tables, efi.systab->nr_tables * sz); + return 0; +} |