cregit-Linux how code gets into the kernel

Release 4.7 drivers/firmware/efi/efi.c

/*
 * 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.
 *
 * 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/of.h>
#include <linux/of_fdt.h>
#include <linux/io.h>
#include <linux/platform_device.h>

#include <asm/early_ioremap.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,
	.smbios3		= 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,
	.fw_vendor		= EFI_INVALID_TABLE_ADDR,
	.runtime		= EFI_INVALID_TABLE_ADDR,
	.config_table		= EFI_INVALID_TABLE_ADDR,
	.esrt			= EFI_INVALID_TABLE_ADDR,
	.properties_table	= EFI_INVALID_TABLE_ADDR,
	.mem_attr_table		= EFI_INVALID_TABLE_ADDR,
};

EXPORT_SYMBOL(efi);


static bool disable_runtime;

static int __init setup_noefi(char *arg) { disable_runtime = true; return 0; }

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dave youngdave young18100.00%1100.00%
Total18100.00%1100.00%

early_param("noefi", setup_noefi);
bool efi_runtime_disabled(void) { return disable_runtime; }

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dave youngdave young10100.00%1100.00%
Total10100.00%1100.00%


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; return 0; }

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PersonTokensPropCommitsCommitProp
dave youngdave young2743.55%133.33%
leif lindholmleif lindholm1930.65%133.33%
ricardo neriricardo neri1625.81%133.33%
Total62100.00%3100.00%

early_param("efi", parse_efi_cmdline); struct kobject *efi_kobj; /* * Let's not leave out systab information that snuck into * the efivars driver */
static ssize_t systab_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *str = buf; if (!kobj || !buf) return -EINVAL; if (efi.mps != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "MPS=0x%lx\n", efi.mps); 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 (efi.hcdp != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); if (efi.boot_info != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); if (efi.uga != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "UGA=0x%lx\n", efi.uga); return str - buf; }

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tom gundersentom gundersen18788.21%133.33%
ard biesheuvelard biesheuvel188.49%133.33%
jean delvarejean delvare73.30%133.33%
Total212100.00%3100.00%

static struct kobj_attribute efi_attr_systab = __ATTR(systab, 0400, systab_show, NULL); #define EFI_FIELD(var) efi.var #define EFI_ATTR_SHOW(name) \ static ssize_t name##_show(struct kobject *kobj, \ struct kobj_attribute *attr, char *buf) \ { \ return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \ } EFI_ATTR_SHOW(fw_vendor); EFI_ATTR_SHOW(runtime); EFI_ATTR_SHOW(config_table);
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); }

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steve mcintyresteve mcintyre37100.00%1100.00%
Total37100.00%1100.00%

static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor); static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime); static struct kobj_attribute efi_attr_config_table = __ATTR_RO(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_vendor.attr, &efi_attr_runtime.attr, &efi_attr_config_table.attr, &efi_attr_fw_platform_size.attr, NULL, };
static umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) { if (attr == &efi_attr_fw_vendor.attr) { if (efi_enabled(EFI_PARAVIRT) || efi.fw_vendor == EFI_INVALID_TABLE_ADDR) return 0; } else if (attr == &efi_attr_runtime.attr) { if (efi.runtime == EFI_INVALID_TABLE_ADDR) return 0; } else if (attr == &efi_attr_config_table.attr) { if (efi.config_table == EFI_INVALID_TABLE_ADDR) return 0; } return attr->mode; }

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dave youngdave young7274.23%150.00%
daniel kiperdaniel kiper2525.77%150.00%
Total97100.00%2100.00%

static 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.set_variable = efi.set_variable; generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; generic_ops.get_next_variable = efi.get_next_variable; generic_ops.query_variable_store = efi_query_variable_store; return efivars_register(&generic_efivars, &generic_ops, efi_kobj); }

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tom gundersentom gundersen4882.76%133.33%
ard biesheuvelard biesheuvel813.79%133.33%
matt flemingmatt fleming23.45%133.33%
Total58100.00%3100.00%


static void generic_ops_unregister(void) { efivars_unregister(&generic_efivars); }

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tom gundersentom gundersen14100.00%1100.00%
Total14100.00%1100.00%

/* * 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_BOOT)) return 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"); return -ENOMEM; } error = generic_ops_register(); if (error) goto err_put; 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; } return 0; err_remove_group: sysfs_remove_group(efi_kobj, &efi_subsys_attr_group); err_unregister: generic_ops_unregister(); err_put: kobject_put(efi_kobj); return error; }

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PersonTokensPropCommitsCommitProp
tom gundersentom gundersen13487.58%133.33%
dave youngdave young149.15%133.33%
eric w. biedermaneric w. biederman53.27%133.33%
Total153100.00%3100.00%

subsys_initcall(efisubsys_init); /* * Find the efi memory descriptor for a given physical address. Given a * physicall address, determine if it exists within an EFI Memory Map entry, * and if so, populate the supplied memory descriptor with the appropriate * data. */
int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) { struct efi_memory_map *map = &efi.memmap; phys_addr_t p, e; if (!efi_enabled(EFI_MEMMAP)) { pr_err_once("EFI_MEMMAP is not enabled.\n"); return -EINVAL; } if (!map) { pr_err_once("efi.memmap is not set.\n"); return -EINVAL; } if (!out_md) { pr_err_once("out_md is null.\n"); return -EINVAL; } if (WARN_ON_ONCE(!map->phys_map)) return -EINVAL; if (WARN_ON_ONCE(map->nr_map == 0) || WARN_ON_ONCE(map->desc_size == 0)) return -EINVAL; e = map->phys_map + map->nr_map * map->desc_size; for (p = map->phys_map; p < e; p += map->desc_size) { efi_memory_desc_t *md; u64 size; u64 end; /* * If a driver calls this after efi_free_boot_services, * ->map will be NULL, and the target may also not be mapped. * So just always get our own virtual map on the CPU. * */ md = early_memremap(p, sizeof (*md)); if (!md) { pr_err_once("early_memremap(%pa, %zu) failed.\n", &p, sizeof (*md)); return -ENOMEM; } if (!(md->attribute & EFI_MEMORY_RUNTIME) && md->type != EFI_BOOT_SERVICES_DATA && md->type != EFI_RUNTIME_SERVICES_DATA) { early_memunmap(md, sizeof (*md)); continue; } 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)); early_memunmap(md, sizeof (*md)); return 0; } early_memunmap(md, sizeof (*md)); } pr_err_once("requested map not found.\n"); return -ENOENT; }

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peter jonespeter jones31098.73%133.33%
ard biesheuvelard biesheuvel30.96%133.33%
matt flemingmatt fleming10.32%133.33%
Total314100.00%3100.00%

/* * 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; }

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peter jonespeter jones31100.00%1100.00%
Total31100.00%1100.00%

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}, {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3}, {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga}, {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt}, {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table}, {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table}, {NULL_GUID, NULL, NULL}, };
static __init int match_config_table(efi_guid_t *guid, unsigned long table, efi_config_table_type_t *table_types) { int i; if (table_types) { 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) pr_cont(" %s=0x%lx ", table_types[i].name, table); return 1; } } } return 0; }

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leif lindholmleif lindholm10191.82%150.00%
ard biesheuvelard biesheuvel98.18%150.00%
Total110100.00%2100.00%


int __init efi_config_parse_tables(void *config_tables, int count, int sz, efi_config_table_type_t *arch_tables) { void *tablep; int i; tablep = config_tables; pr_info(""); for (i = 0; i < count; 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"); 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"); set_bit(EFI_CONFIG_TABLES, &efi.flags); /* Parse the EFI Properties table if it exists */ if (efi.properties_table != EFI_INVALID_TABLE_ADDR) { efi_properties_table_t *tbl; tbl = early_memremap(efi.properties_table, sizeof(*tbl)); if (tbl == NULL) { pr_err("Could not map Properties table!\n"); return -ENOMEM; } if (tbl->memory_protection_attribute & EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) set_bit(EFI_NX_PE_DATA, &efi.flags); early_memunmap(tbl, sizeof(*tbl)); } return 0; }

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leif lindholmleif lindholm17162.64%133.33%
ard biesheuvelard biesheuvel10237.36%266.67%
Total273100.00%3100.00%


int __init efi_config_init(efi_config_table_type_t *arch_tables) { void *config_tables; int sz, ret; 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; } ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz, arch_tables); early_memunmap(config_tables, efi.systab->nr_tables * sz); return ret; }

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ard biesheuvelard biesheuvel9081.08%133.33%
leif lindholmleif lindholm1513.51%133.33%
matt flemingmatt fleming65.41%133.33%
Total111100.00%3100.00%

#ifdef CONFIG_EFI_VARS_MODULE
static int __init efi_load_efivars(void) { struct platform_device *pdev; if (!efi_enabled(EFI_RUNTIME_SERVICES)) return 0; pdev = platform_device_register_simple("efivars", 0, NULL, 0); return IS_ERR(pdev) ? PTR_ERR(pdev) : 0; }

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chun-yi leechun-yi lee51100.00%1100.00%
Total51100.00%1100.00%

device_initcall(efi_load_efivars); #endif #ifdef CONFIG_EFI_PARAMS_FROM_FDT #define UEFI_PARAM(name, prop, field) \ { \ { name }, \ { prop }, \ offsetof(struct efi_fdt_params, field), \ FIELD_SIZEOF(struct efi_fdt_params, field) \ } static __initdata struct { const char name[32]; const char propname[32]; int offset; int size; } dt_params[] = { UEFI_PARAM("System Table", "linux,uefi-system-table", system_table), UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap), UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size), UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size), UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) }; struct param_info { int found; void *params; };
static int __init fdt_find_uefi_params(unsigned long node, const char *uname, int depth, void *data) { struct param_info *info = data; const void *prop; void *dest; u64 val; int i, len; if (depth != 1 || strcmp(uname, "chosen") != 0) return 0; for (i = 0; i < ARRAY_SIZE(dt_params); i++) { prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len); if (!prop) return 0; dest = info->params + dt_params[i].offset; info->found++; val = of_read_number(prop, len / sizeof(u32)); if (dt_params[i].size == sizeof(u32)) *(u32 *)dest = val; else *(u64 *)dest = val; if (efi_enabled(EFI_DBG)) pr_info(" %s: 0x%0*llx\n", dt_params[i].name, dt_params[i].size * 2, val); } return 1; }

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mark saltermark salter19293.20%125.00%
catalin marinascatalin marinas104.85%250.00%
leif lindholmleif lindholm41.94%125.00%
Total206100.00%4100.00%


int __init efi_get_fdt_params(struct efi_fdt_params *params) { struct param_info info; int ret; pr_info("Getting EFI parameters from FDT:\n"); info.found = 0; info.params = params; ret = of_scan_flat_dt(fdt_find_uefi_params, &info); if (!info.found) pr_info("UEFI not found.\n"); else if (!ret) pr_err("Can't find '%s' in device tree!\n", dt_params[info.found].name); return ret; }

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catalin marinascatalin marinas5163.75%150.00%
mark saltermark salter2936.25%150.00%
Total80100.00%2100.00%

#endif /* CONFIG_EFI_PARAMS_FROM_FDT */ static __initdata char memory_type_name[][20] = { "Reserved", "Loader Code", "Loader Data", "Boot Code", "Boot Data", "Runtime Code", "Runtime Data", "Conventional Memory", "Unusable Memory", "ACPI Reclaim Memory", "ACPI Memory NVS", "Memory Mapped I/O", "MMIO Port Space", "PAL Code", "Persistent Memory", };
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_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|%3s|%2s|%2s|%2s|%2s]", attr & EFI_MEMORY_RUNTIME ? "RUN" : "", attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "", 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; }

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laszlo erseklaszlo ersek24188.60%125.00%
robert elliottrobert elliott114.04%125.00%
ard biesheuvelard biesheuvel103.68%125.00%
taku izumitaku izumi103.68%125.00%
Total272100.00%4100.00%

/* * 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. * * Despite being marked __weak, most architectures should *not* * override this function. It is __weak solely for the benefit * of ia64 which has a funky EFI memory map that doesn't work * the same way as other architectures. */
u64 __weak 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; }

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jonathan (zhixiong) zhangjonathan (zhixiong) zhang6394.03%150.00%
matt flemingmatt fleming45.97%150.00%
Total67100.00%2100.00%


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; default: err = -EINVAL; } return err; }

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matt flemingmatt fleming88100.00%1100.00%
Total88100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
leif lindholmleif lindholm46916.35%37.50%
tom gundersentom gundersen46416.18%12.50%
peter jonespeter jones35912.52%12.50%
mark saltermark salter32811.44%12.50%
ard biesheuvelard biesheuvel29110.15%1127.50%
laszlo erseklaszlo ersek2799.73%12.50%
dave youngdave young2558.89%410.00%
matt flemingmatt fleming1013.52%512.50%
jonathan (zhixiong) zhangjonathan (zhixiong) zhang642.23%12.50%
chun-yi leechun-yi lee642.23%12.50%
catalin marinascatalin marinas642.23%25.00%
steve mcintyresteve mcintyre521.81%12.50%
daniel kiperdaniel kiper250.87%12.50%
ricardo neriricardo neri160.56%12.50%
robert elliottrobert elliott140.49%25.00%
taku izumitaku izumi100.35%12.50%
jean delvarejean delvare70.24%12.50%
eric w. biedermaneric w. biederman50.17%12.50%
daeseok youndaeseok youn10.03%12.50%
Total2868100.00%40100.00%
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