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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/firmware/efi/efi.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/efi/efi.c')
-rw-r--r--drivers/firmware/efi/efi.c1087
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