diff options
Diffstat (limited to 'drivers/firmware/efi/efi.c')
| -rw-r--r-- | drivers/firmware/efi/efi.c | 1087 |
1 files changed, 1087 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c new file mode 100644 index 000000000..b7c0e8cc0 --- /dev/null +++ b/drivers/firmware/efi/efi.c @@ -0,0 +1,1087 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * efi.c - EFI subsystem + * + * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> + * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> + * Copyright (C) 2013 Tom Gundersen <teg@jklm.no> + * + * This code registers /sys/firmware/efi{,/efivars} when EFI is supported, + * allowing the efivarfs to be mounted or the efivars module to be loaded. + * The existance of /sys/firmware/efi may also be used by userspace to + * determine that the system supports EFI. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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/initrd.h> +#include <linux/io.h> +#include <linux/kexec.h> +#include <linux/platform_device.h> +#include <linux/random.h> +#include <linux/reboot.h> +#include <linux/slab.h> +#include <linux/acpi.h> +#include <linux/ucs2_string.h> +#include <linux/memblock.h> +#include <linux/security.h> + +#include <asm/early_ioremap.h> + +struct efi __read_mostly efi = { + .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, + .esrt = EFI_INVALID_TABLE_ADDR, + .tpm_log = EFI_INVALID_TABLE_ADDR, + .tpm_final_log = EFI_INVALID_TABLE_ADDR, +#ifdef CONFIG_LOAD_UEFI_KEYS + .mokvar_table = EFI_INVALID_TABLE_ADDR, +#endif +#ifdef CONFIG_EFI_COCO_SECRET + .coco_secret = EFI_INVALID_TABLE_ADDR, +#endif +}; +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; +static unsigned long __initdata initrd = EFI_INVALID_TABLE_ADDR; + +struct mm_struct efi_mm = { + .mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, efi_mm.mmap_lock), + .mm_users = ATOMIC_INIT(2), + .mm_count = ATOMIC_INIT(1), + .write_protect_seq = SEQCNT_ZERO(efi_mm.write_protect_seq), + MMAP_LOCK_INITIALIZER(efi_mm) + .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock), + .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), + .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0}, +}; + +struct workqueue_struct *efi_rts_wq; + +static bool disable_runtime = IS_ENABLED(CONFIG_EFI_DISABLE_RUNTIME); +static int __init setup_noefi(char *arg) +{ + disable_runtime = true; + return 0; +} +early_param("noefi", setup_noefi); + +bool efi_runtime_disabled(void) +{ + return disable_runtime; +} + +bool __pure __efi_soft_reserve_enabled(void) +{ + return !efi_enabled(EFI_MEM_NO_SOFT_RESERVE); +} + +static int __init parse_efi_cmdline(char *str) +{ + if (!str) { + pr_warn("need at least one option\n"); + return -EINVAL; + } + + if (parse_option_str(str, "debug")) + set_bit(EFI_DBG, &efi.flags); + + if (parse_option_str(str, "noruntime")) + disable_runtime = true; + + if (parse_option_str(str, "runtime")) + disable_runtime = false; + + if (parse_option_str(str, "nosoftreserve")) + set_bit(EFI_MEM_NO_SOFT_RESERVE, &efi.flags); + + return 0; +} +early_param("efi", parse_efi_cmdline); + +struct kobject *efi_kobj; + +/* + * Let's not leave out systab information that snuck into + * the efivars driver + * Note, do not add more fields in systab sysfs file as it breaks sysfs + * one value per file rule! + */ +static ssize_t systab_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + char *str = buf; + + if (!kobj || !buf) + return -EINVAL; + + if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); + if (efi.acpi != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); + /* + * If both SMBIOS and SMBIOS3 entry points are implemented, the + * SMBIOS3 entry point shall be preferred, so we list it first to + * let applications stop parsing after the first match. + */ + if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) + 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 (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86)) + str = efi_systab_show_arch(str); + + return str - buf; +} + +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) +{ + return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32); +} + +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, + NULL, +}; + +umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, + int n) +{ + return attr->mode; +} + +static const struct attribute_group efi_subsys_attr_group = { + .attrs = efi_subsys_attrs, + .is_visible = efi_attr_is_visible, +}; + +static struct efivars generic_efivars; +static struct efivar_operations generic_ops; + +static int generic_ops_register(void) +{ + generic_ops.get_variable = efi.get_variable; + generic_ops.get_next_variable = efi.get_next_variable; + generic_ops.query_variable_store = efi_query_variable_store; + + if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) { + generic_ops.set_variable = efi.set_variable; + generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; + } + return efivars_register(&generic_efivars, &generic_ops, efi_kobj); +} + +static void generic_ops_unregister(void) +{ + efivars_unregister(&generic_efivars); +} + +#ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS +#define EFIVAR_SSDT_NAME_MAX 16UL +static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata; +static int __init efivar_ssdt_setup(char *str) +{ + int ret = security_locked_down(LOCKDOWN_ACPI_TABLES); + + if (ret) + return ret; + + if (strlen(str) < sizeof(efivar_ssdt)) + memcpy(efivar_ssdt, str, strlen(str)); + else + pr_warn("efivar_ssdt: name too long: %s\n", str); + return 1; +} +__setup("efivar_ssdt=", efivar_ssdt_setup); + +static __init int efivar_ssdt_load(void) +{ + unsigned long name_size = 256; + efi_char16_t *name = NULL; + efi_status_t status; + efi_guid_t guid; + + if (!efivar_ssdt[0]) + return 0; + + name = kzalloc(name_size, GFP_KERNEL); + if (!name) + return -ENOMEM; + + for (;;) { + char utf8_name[EFIVAR_SSDT_NAME_MAX]; + unsigned long data_size = 0; + void *data; + int limit; + + status = efi.get_next_variable(&name_size, name, &guid); + if (status == EFI_NOT_FOUND) { + break; + } else if (status == EFI_BUFFER_TOO_SMALL) { + efi_char16_t *name_tmp = + krealloc(name, name_size, GFP_KERNEL); + if (!name_tmp) { + kfree(name); + return -ENOMEM; + } + name = name_tmp; + continue; + } + + limit = min(EFIVAR_SSDT_NAME_MAX, name_size); + ucs2_as_utf8(utf8_name, name, limit - 1); + if (strncmp(utf8_name, efivar_ssdt, limit) != 0) + continue; + + pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt, &guid); + + status = efi.get_variable(name, &guid, NULL, &data_size, NULL); + if (status != EFI_BUFFER_TOO_SMALL || !data_size) + return -EIO; + + data = kmalloc(data_size, GFP_KERNEL); + if (!data) + return -ENOMEM; + + status = efi.get_variable(name, &guid, NULL, &data_size, data); + if (status == EFI_SUCCESS) { + acpi_status ret = acpi_load_table(data, NULL); + if (ret) + pr_err("failed to load table: %u\n", ret); + else + continue; + } else { + pr_err("failed to get var data: 0x%lx\n", status); + } + kfree(data); + } + return 0; +} +#else +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 + * EFI. + */ +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; + + 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) { + pr_err("efi: Firmware registration failed.\n"); + error = -ENOMEM; + goto err_destroy_wq; + } + + if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE | + EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) { + error = generic_ops_register(); + if (error) + goto err_put; + efivar_ssdt_load(); + platform_device_register_simple("efivars", 0, NULL, 0); + } + + error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); + if (error) { + pr_err("efi: Sysfs attribute export failed with error %d.\n", + error); + goto err_unregister; + } + + error = efi_runtime_map_init(efi_kobj); + if (error) + goto err_remove_group; + + /* and the standard mountpoint for efivarfs */ + error = sysfs_create_mount_point(efi_kobj, "efivars"); + if (error) { + pr_err("efivars: Subsystem registration failed.\n"); + goto err_remove_group; + } + + if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS)) + efi_debugfs_init(); + +#ifdef CONFIG_EFI_COCO_SECRET + if (efi.coco_secret != EFI_INVALID_TABLE_ADDR) + platform_device_register_simple("efi_secret", 0, NULL, 0); +#endif + + return 0; + +err_remove_group: + sysfs_remove_group(efi_kobj, &efi_subsys_attr_group); +err_unregister: + if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE | + EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) + generic_ops_unregister(); +err_put: + kobject_put(efi_kobj); +err_destroy_wq: + if (efi_rts_wq) + destroy_workqueue(efi_rts_wq); + + return error; +} + +subsys_initcall(efisubsys_init); + +void __init efi_find_mirror(void) +{ + efi_memory_desc_t *md; + u64 mirror_size = 0, total_size = 0; + + if (!efi_enabled(EFI_MEMMAP)) + return; + + for_each_efi_memory_desc(md) { + unsigned long long start = md->phys_addr; + unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; + + total_size += size; + if (md->attribute & EFI_MEMORY_MORE_RELIABLE) { + memblock_mark_mirror(start, size); + mirror_size += size; + } + } + if (mirror_size) + pr_info("Memory: %lldM/%lldM mirrored memory\n", + mirror_size>>20, total_size>>20); +} + +/* + * Find the efi memory descriptor for a given physical address. Given a + * physical address, determine if it exists within an EFI Memory Map entry, + * and if so, populate the supplied memory descriptor with the appropriate + * data. + */ +int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) +{ + efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) { + pr_err_once("EFI_MEMMAP is not enabled.\n"); + return -EINVAL; + } + + if (!out_md) { + pr_err_once("out_md is null.\n"); + return -EINVAL; + } + + for_each_efi_memory_desc(md) { + u64 size; + u64 end; + + size = md->num_pages << EFI_PAGE_SHIFT; + end = md->phys_addr + size; + if (phys_addr >= md->phys_addr && phys_addr < end) { + memcpy(out_md, md, sizeof(*out_md)); + return 0; + } + } + return -ENOENT; +} + +/* + * Calculate the highest address of an efi memory descriptor. + */ +u64 __init efi_mem_desc_end(efi_memory_desc_t *md) +{ + u64 size = md->num_pages << EFI_PAGE_SHIFT; + u64 end = md->phys_addr + size; + return end; +} + +void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {} + +/** + * efi_mem_reserve - Reserve an EFI memory region + * @addr: Physical address to reserve + * @size: Size of reservation + * + * Mark a region as reserved from general kernel allocation and + * prevent it being released by efi_free_boot_services(). + * + * This function should be called drivers once they've parsed EFI + * configuration tables to figure out where their data lives, e.g. + * efi_esrt_init(). + */ +void __init efi_mem_reserve(phys_addr_t addr, u64 size) +{ + if (!memblock_is_region_reserved(addr, size)) + memblock_reserve(addr, size); + + /* + * Some architectures (x86) reserve all boot services ranges + * until efi_free_boot_services() because of buggy firmware + * implementations. This means the above memblock_reserve() is + * superfluous on x86 and instead what it needs to do is + * ensure the @start, @size is not freed. + */ + efi_arch_mem_reserve(addr, size); +} + +static const efi_config_table_type_t common_tables[] __initconst = { + {ACPI_20_TABLE_GUID, &efi.acpi20, "ACPI 2.0" }, + {ACPI_TABLE_GUID, &efi.acpi, "ACPI" }, + {SMBIOS_TABLE_GUID, &efi.smbios, "SMBIOS" }, + {SMBIOS3_TABLE_GUID, &efi.smbios3, "SMBIOS 3.0" }, + {EFI_SYSTEM_RESOURCE_TABLE_GUID, &efi.esrt, "ESRT" }, + {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, &efi_mem_attr_table, "MEMATTR" }, + {LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" }, + {LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" }, + {LINUX_EFI_TPM_FINAL_LOG_GUID, &efi.tpm_final_log, "TPMFinalLog" }, + {LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" }, + {LINUX_EFI_INITRD_MEDIA_GUID, &initrd, "INITRD" }, + {EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" }, +#ifdef CONFIG_EFI_RCI2_TABLE + {DELLEMC_EFI_RCI2_TABLE_GUID, &rci2_table_phys }, +#endif +#ifdef CONFIG_LOAD_UEFI_KEYS + {LINUX_EFI_MOK_VARIABLE_TABLE_GUID, &efi.mokvar_table, "MOKvar" }, +#endif +#ifdef CONFIG_EFI_COCO_SECRET + {LINUX_EFI_COCO_SECRET_AREA_GUID, &efi.coco_secret, "CocoSecret" }, +#endif + {}, +}; + +static __init int match_config_table(const efi_guid_t *guid, + unsigned long table, + const efi_config_table_type_t *table_types) +{ + int i; + + for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) { + if (!efi_guidcmp(*guid, table_types[i].guid)) { + *(table_types[i].ptr) = table; + if (table_types[i].name[0]) + pr_cont("%s=0x%lx ", + table_types[i].name, table); + return 1; + } + } + + return 0; +} + +int __init efi_config_parse_tables(const efi_config_table_t *config_tables, + int count, + const efi_config_table_type_t *arch_tables) +{ + 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; + + pr_info(""); + for (i = 0; i < count; i++) { + 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; + } + } else { + guid = &tbl32[i].guid; + table = tbl32[i].table; + } + + if (!match_config_table(guid, table, common_tables) && arch_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) { + struct linux_efi_random_seed *seed; + u32 size = 0; + + seed = early_memremap(efi_rng_seed, sizeof(*seed)); + if (seed != NULL) { + size = min_t(u32, seed->size, SZ_1K); // sanity check + early_memunmap(seed, sizeof(*seed)); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + if (size > 0) { + seed = early_memremap(efi_rng_seed, + sizeof(*seed) + size); + if (seed != NULL) { + add_bootloader_randomness(seed->bits, size); + memzero_explicit(seed->bits, size); + early_memunmap(seed, sizeof(*seed) + size); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + } + } + + if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP)) + efi_memattr_init(); + + efi_tpm_eventlog_init(); + + if (mem_reserve != EFI_INVALID_TABLE_ADDR) { + unsigned long prsv = mem_reserve; + + while (prsv) { + struct linux_efi_memreserve *rsv; + u8 *p; + + /* + * Just map a full page: that is what we will get + * anyway, and it permits us to map the entire entry + * before knowing its size. + */ + p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE), + PAGE_SIZE); + if (p == NULL) { + pr_err("Could not map UEFI memreserve entry!\n"); + return -ENOMEM; + } + + rsv = (void *)(p + prsv % PAGE_SIZE); + + /* reserve the entry itself */ + memblock_reserve(prsv, + struct_size(rsv, entry, rsv->size)); + + for (i = 0; i < atomic_read(&rsv->count); i++) { + memblock_reserve(rsv->entry[i].base, + rsv->entry[i].size); + } + + prsv = rsv->next; + early_memunmap(p, PAGE_SIZE); + } + } + + if (rt_prop != EFI_INVALID_TABLE_ADDR) { + efi_rt_properties_table_t *tbl; + + tbl = early_memremap(rt_prop, sizeof(*tbl)); + if (tbl) { + efi.runtime_supported_mask &= tbl->runtime_services_supported; + early_memunmap(tbl, sizeof(*tbl)); + } + } + + if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && + initrd != EFI_INVALID_TABLE_ADDR && phys_initrd_size == 0) { + struct linux_efi_initrd *tbl; + + tbl = early_memremap(initrd, sizeof(*tbl)); + if (tbl) { + phys_initrd_start = tbl->base; + phys_initrd_size = tbl->size; + early_memunmap(tbl, sizeof(*tbl)); + } + } + + return 0; +} + +int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr, + int min_major_version) +{ + if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) { + pr_err("System table signature incorrect!\n"); + return -EINVAL; + } + + 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); + + return 0; +} + +#ifndef CONFIG_IA64 +static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor, + size_t size) +{ + const efi_char16_t *ret; + + ret = early_memremap_ro(fw_vendor, size); + if (!ret) + pr_err("Could not map the firmware vendor!\n"); + return ret; +} + +static void __init unmap_fw_vendor(const void *fw_vendor, size_t size) +{ + early_memunmap((void *)fw_vendor, size); +} +#else +#define map_fw_vendor(p, s) __va(p) +#define unmap_fw_vendor(v, s) +#endif + +void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr, + unsigned long fw_vendor) +{ + char vendor[100] = "unknown"; + const efi_char16_t *c16; + size_t i; + + 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'; + + unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t)); + } + + pr_info("EFI v%u.%.02u by %s\n", + systab_hdr->revision >> 16, + systab_hdr->revision & 0xffff, + vendor); + + if (IS_ENABLED(CONFIG_X86_64) && + systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION && + !strcmp(vendor, "Apple")) { + pr_info("Apple Mac detected, using EFI v1.10 runtime services only\n"); + efi.runtime_version = EFI_1_10_SYSTEM_TABLE_REVISION; + } +} + +static __initdata char memory_type_name[][13] = { + "Reserved", + "Loader Code", + "Loader Data", + "Boot Code", + "Boot Data", + "Runtime Code", + "Runtime Data", + "Conventional", + "Unusable", + "ACPI Reclaim", + "ACPI Mem NVS", + "MMIO", + "MMIO Port", + "PAL Code", + "Persistent", +}; + +char * __init efi_md_typeattr_format(char *buf, size_t size, + const efi_memory_desc_t *md) +{ + char *pos; + int type_len; + u64 attr; + + pos = buf; + if (md->type >= ARRAY_SIZE(memory_type_name)) + type_len = snprintf(pos, size, "[type=%u", md->type); + else + type_len = snprintf(pos, size, "[%-*s", + (int)(sizeof(memory_type_name[0]) - 1), + memory_type_name[md->type]); + if (type_len >= size) + return buf; + + pos += type_len; + size -= type_len; + + attr = md->attribute; + if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT | + EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO | + EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP | + EFI_MEMORY_NV | EFI_MEMORY_SP | EFI_MEMORY_CPU_CRYPTO | + EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE)) + snprintf(pos, size, "|attr=0x%016llx]", + (unsigned long long)attr); + else + snprintf(pos, size, + "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]", + attr & EFI_MEMORY_RUNTIME ? "RUN" : "", + attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "", + attr & EFI_MEMORY_CPU_CRYPTO ? "CC" : "", + attr & EFI_MEMORY_SP ? "SP" : "", + attr & EFI_MEMORY_NV ? "NV" : "", + attr & EFI_MEMORY_XP ? "XP" : "", + attr & EFI_MEMORY_RP ? "RP" : "", + attr & EFI_MEMORY_WP ? "WP" : "", + attr & EFI_MEMORY_RO ? "RO" : "", + attr & EFI_MEMORY_UCE ? "UCE" : "", + attr & EFI_MEMORY_WB ? "WB" : "", + attr & EFI_MEMORY_WT ? "WT" : "", + attr & EFI_MEMORY_WC ? "WC" : "", + attr & EFI_MEMORY_UC ? "UC" : ""); + return buf; +} + +/* + * IA64 has a funky EFI memory map that doesn't work the same way as + * other architectures. + */ +#ifndef CONFIG_IA64 +/* + * efi_mem_attributes - lookup memmap attributes for physical address + * @phys_addr: the physical address to lookup + * + * Search in the EFI memory map for the region covering + * @phys_addr. Returns the EFI memory attributes if the region + * was found in the memory map, 0 otherwise. + */ +u64 efi_mem_attributes(unsigned long phys_addr) +{ + efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) + return 0; + + for_each_efi_memory_desc(md) { + if ((md->phys_addr <= phys_addr) && + (phys_addr < (md->phys_addr + + (md->num_pages << EFI_PAGE_SHIFT)))) + return md->attribute; + } + return 0; +} + +/* + * efi_mem_type - lookup memmap type for physical address + * @phys_addr: the physical address to lookup + * + * Search in the EFI memory map for the region covering @phys_addr. + * Returns the EFI memory type if the region was found in the memory + * map, -EINVAL otherwise. + */ +int efi_mem_type(unsigned long phys_addr) +{ + const efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) + return -ENOTSUPP; + + for_each_efi_memory_desc(md) { + if ((md->phys_addr <= phys_addr) && + (phys_addr < (md->phys_addr + + (md->num_pages << EFI_PAGE_SHIFT)))) + return md->type; + } + return -EINVAL; +} +#endif + +int efi_status_to_err(efi_status_t status) +{ + int err; + + switch (status) { + case EFI_SUCCESS: + err = 0; + break; + case EFI_INVALID_PARAMETER: + err = -EINVAL; + break; + case EFI_OUT_OF_RESOURCES: + err = -ENOSPC; + break; + case EFI_DEVICE_ERROR: + err = -EIO; + break; + case EFI_WRITE_PROTECTED: + err = -EROFS; + break; + case EFI_SECURITY_VIOLATION: + err = -EACCES; + break; + case EFI_NOT_FOUND: + err = -ENOENT; + break; + case EFI_ABORTED: + err = -EINTR; + break; + default: + err = -EINVAL; + } + + return err; +} +EXPORT_SYMBOL_GPL(efi_status_to_err); + +static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock); +static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init; + +static int __init efi_memreserve_map_root(void) +{ + if (mem_reserve == EFI_INVALID_TABLE_ADDR) + return -ENODEV; + + efi_memreserve_root = memremap(mem_reserve, + sizeof(*efi_memreserve_root), + MEMREMAP_WB); + if (WARN_ON_ONCE(!efi_memreserve_root)) + return -ENOMEM; + return 0; +} + +static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size) +{ + struct resource *res, *parent; + int ret; + + res = kzalloc(sizeof(struct resource), GFP_ATOMIC); + if (!res) + return -ENOMEM; + + res->name = "reserved"; + res->flags = IORESOURCE_MEM; + res->start = addr; + res->end = addr + size - 1; + + /* we expect a conflict with a 'System RAM' region */ + parent = request_resource_conflict(&iomem_resource, res); + ret = parent ? request_resource(parent, res) : 0; + + /* + * Given that efi_mem_reserve_iomem() can be called at any + * time, only call memblock_reserve() if the architecture + * keeps the infrastructure around. + */ + if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK) && !ret) + memblock_reserve(addr, size); + + return ret; +} + +int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size) +{ + struct linux_efi_memreserve *rsv; + unsigned long prsv; + int rc, index; + + if (efi_memreserve_root == (void *)ULONG_MAX) + return -ENODEV; + + if (!efi_memreserve_root) { + rc = efi_memreserve_map_root(); + if (rc) + return rc; + } + + /* first try to find a slot in an existing linked list entry */ + for (prsv = efi_memreserve_root->next; prsv; ) { + rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB); + if (!rsv) + return -ENOMEM; + index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size); + if (index < rsv->size) { + rsv->entry[index].base = addr; + rsv->entry[index].size = size; + + memunmap(rsv); + return efi_mem_reserve_iomem(addr, size); + } + prsv = rsv->next; + memunmap(rsv); + } + + /* no slot found - allocate a new linked list entry */ + rsv = (struct linux_efi_memreserve *)__get_free_page(GFP_ATOMIC); + if (!rsv) + return -ENOMEM; + + rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K); + if (rc) { + free_page((unsigned long)rsv); + return rc; + } + + /* + * The memremap() call above assumes that a linux_efi_memreserve entry + * never crosses a page boundary, so let's ensure that this remains true + * even when kexec'ing a 4k pages kernel from a >4k pages kernel, by + * using SZ_4K explicitly in the size calculation below. + */ + rsv->size = EFI_MEMRESERVE_COUNT(SZ_4K); + atomic_set(&rsv->count, 1); + rsv->entry[0].base = addr; + rsv->entry[0].size = size; + + spin_lock(&efi_mem_reserve_persistent_lock); + rsv->next = efi_memreserve_root->next; + efi_memreserve_root->next = __pa(rsv); + spin_unlock(&efi_mem_reserve_persistent_lock); + + return efi_mem_reserve_iomem(addr, size); +} + +static int __init efi_memreserve_root_init(void) +{ + if (efi_memreserve_root) + return 0; + if (efi_memreserve_map_root()) + efi_memreserve_root = (void *)ULONG_MAX; + return 0; +} +early_initcall(efi_memreserve_root_init); + +#ifdef CONFIG_KEXEC +static int update_efi_random_seed(struct notifier_block *nb, + unsigned long code, void *unused) +{ + struct linux_efi_random_seed *seed; + u32 size = 0; + + if (!kexec_in_progress) + return NOTIFY_DONE; + + seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB); + if (seed != NULL) { + size = min(seed->size, EFI_RANDOM_SEED_SIZE); + memunmap(seed); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + if (size > 0) { + seed = memremap(efi_rng_seed, sizeof(*seed) + size, + MEMREMAP_WB); + if (seed != NULL) { + seed->size = size; + get_random_bytes(seed->bits, seed->size); + memunmap(seed); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + } + return NOTIFY_DONE; +} + +static struct notifier_block efi_random_seed_nb = { + .notifier_call = update_efi_random_seed, +}; + +static int __init register_update_efi_random_seed(void) +{ + if (efi_rng_seed == EFI_INVALID_TABLE_ADDR) + return 0; + return register_reboot_notifier(&efi_random_seed_nb); +} +late_initcall(register_update_efi_random_seed); +#endif |