Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * efi.c - EFI subsystem |
| 3 | * |
| 4 | * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> |
| 5 | * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> |
| 6 | * Copyright (C) 2013 Tom Gundersen <teg@jklm.no> |
| 7 | * |
| 8 | * This code registers /sys/firmware/efi{,/efivars} when EFI is supported, |
| 9 | * allowing the efivarfs to be mounted or the efivars module to be loaded. |
| 10 | * The existance of /sys/firmware/efi may also be used by userspace to |
| 11 | * determine that the system supports EFI. |
| 12 | * |
| 13 | * This file is released under the GPLv2. |
| 14 | */ |
| 15 | |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 17 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 18 | #include <linux/kobject.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/device.h> |
| 22 | #include <linux/efi.h> |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 23 | #include <linux/of.h> |
| 24 | #include <linux/of_fdt.h> |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 25 | #include <linux/io.h> |
Lee, Chun-Yi | 28d5402 | 2014-07-09 18:39:29 +0800 | [diff] [blame] | 26 | #include <linux/platform_device.h> |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 27 | |
Ard Biesheuvel | 0f7f2f0 | 2016-01-12 14:22:46 +0100 | [diff] [blame] | 28 | #include <asm/early_ioremap.h> |
Ard Biesheuvel | f7d9248 | 2015-11-30 13:28:19 +0100 | [diff] [blame] | 29 | |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 30 | struct efi __read_mostly efi = { |
Ard Biesheuvel | bf92486 | 2015-09-09 10:08:15 +0200 | [diff] [blame] | 31 | .mps = EFI_INVALID_TABLE_ADDR, |
| 32 | .acpi = EFI_INVALID_TABLE_ADDR, |
| 33 | .acpi20 = EFI_INVALID_TABLE_ADDR, |
| 34 | .smbios = EFI_INVALID_TABLE_ADDR, |
| 35 | .smbios3 = EFI_INVALID_TABLE_ADDR, |
| 36 | .sal_systab = EFI_INVALID_TABLE_ADDR, |
| 37 | .boot_info = EFI_INVALID_TABLE_ADDR, |
| 38 | .hcdp = EFI_INVALID_TABLE_ADDR, |
| 39 | .uga = EFI_INVALID_TABLE_ADDR, |
| 40 | .uv_systab = EFI_INVALID_TABLE_ADDR, |
| 41 | .fw_vendor = EFI_INVALID_TABLE_ADDR, |
| 42 | .runtime = EFI_INVALID_TABLE_ADDR, |
| 43 | .config_table = EFI_INVALID_TABLE_ADDR, |
| 44 | .esrt = EFI_INVALID_TABLE_ADDR, |
| 45 | .properties_table = EFI_INVALID_TABLE_ADDR, |
Ard Biesheuvel | a604af0 | 2016-04-25 21:06:44 +0100 | [diff] [blame] | 46 | .mem_attr_table = EFI_INVALID_TABLE_ADDR, |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 47 | }; |
| 48 | EXPORT_SYMBOL(efi); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 49 | |
Dave Young | b2e0a54 | 2014-08-14 17:15:26 +0800 | [diff] [blame] | 50 | static bool disable_runtime; |
| 51 | static int __init setup_noefi(char *arg) |
| 52 | { |
| 53 | disable_runtime = true; |
| 54 | return 0; |
| 55 | } |
| 56 | early_param("noefi", setup_noefi); |
| 57 | |
| 58 | bool efi_runtime_disabled(void) |
| 59 | { |
| 60 | return disable_runtime; |
| 61 | } |
| 62 | |
Dave Young | 5ae3683 | 2014-08-14 17:15:28 +0800 | [diff] [blame] | 63 | static int __init parse_efi_cmdline(char *str) |
| 64 | { |
Ricardo Neri | 9115c75 | 2015-07-15 19:36:03 -0700 | [diff] [blame] | 65 | if (!str) { |
| 66 | pr_warn("need at least one option\n"); |
| 67 | return -EINVAL; |
| 68 | } |
| 69 | |
Leif Lindholm | 12dd00e | 2015-08-26 14:24:56 +0100 | [diff] [blame] | 70 | if (parse_option_str(str, "debug")) |
| 71 | set_bit(EFI_DBG, &efi.flags); |
| 72 | |
Dave Young | 5ae3683 | 2014-08-14 17:15:28 +0800 | [diff] [blame] | 73 | if (parse_option_str(str, "noruntime")) |
| 74 | disable_runtime = true; |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | early_param("efi", parse_efi_cmdline); |
| 79 | |
Peter Jones | 0bb5490 | 2015-04-28 18:44:31 -0400 | [diff] [blame] | 80 | struct kobject *efi_kobj; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 81 | |
| 82 | /* |
| 83 | * Let's not leave out systab information that snuck into |
| 84 | * the efivars driver |
| 85 | */ |
| 86 | static ssize_t systab_show(struct kobject *kobj, |
| 87 | struct kobj_attribute *attr, char *buf) |
| 88 | { |
| 89 | char *str = buf; |
| 90 | |
| 91 | if (!kobj || !buf) |
| 92 | return -EINVAL; |
| 93 | |
| 94 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
| 95 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); |
| 96 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) |
| 97 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); |
| 98 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) |
| 99 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); |
Jean Delvare | b119fe0 | 2015-04-30 15:23:05 +0200 | [diff] [blame] | 100 | /* |
| 101 | * If both SMBIOS and SMBIOS3 entry points are implemented, the |
| 102 | * SMBIOS3 entry point shall be preferred, so we list it first to |
| 103 | * let applications stop parsing after the first match. |
| 104 | */ |
Ard Biesheuvel | e1ccbbc | 2014-10-14 16:34:47 +0200 | [diff] [blame] | 105 | if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) |
| 106 | str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3); |
Jean Delvare | b119fe0 | 2015-04-30 15:23:05 +0200 | [diff] [blame] | 107 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) |
| 108 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 109 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) |
| 110 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); |
| 111 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) |
| 112 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); |
| 113 | if (efi.uga != EFI_INVALID_TABLE_ADDR) |
| 114 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); |
| 115 | |
| 116 | return str - buf; |
| 117 | } |
| 118 | |
| 119 | static struct kobj_attribute efi_attr_systab = |
| 120 | __ATTR(systab, 0400, systab_show, NULL); |
| 121 | |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 122 | #define EFI_FIELD(var) efi.var |
| 123 | |
| 124 | #define EFI_ATTR_SHOW(name) \ |
| 125 | static ssize_t name##_show(struct kobject *kobj, \ |
| 126 | struct kobj_attribute *attr, char *buf) \ |
| 127 | { \ |
| 128 | return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \ |
| 129 | } |
| 130 | |
| 131 | EFI_ATTR_SHOW(fw_vendor); |
| 132 | EFI_ATTR_SHOW(runtime); |
| 133 | EFI_ATTR_SHOW(config_table); |
| 134 | |
Steve McIntyre | 2859dff | 2015-01-09 15:29:53 +0000 | [diff] [blame] | 135 | static ssize_t fw_platform_size_show(struct kobject *kobj, |
| 136 | struct kobj_attribute *attr, char *buf) |
| 137 | { |
| 138 | return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32); |
| 139 | } |
| 140 | |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 141 | static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor); |
| 142 | static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime); |
| 143 | static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table); |
Steve McIntyre | 2859dff | 2015-01-09 15:29:53 +0000 | [diff] [blame] | 144 | static struct kobj_attribute efi_attr_fw_platform_size = |
| 145 | __ATTR_RO(fw_platform_size); |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 146 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 147 | static struct attribute *efi_subsys_attrs[] = { |
| 148 | &efi_attr_systab.attr, |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 149 | &efi_attr_fw_vendor.attr, |
| 150 | &efi_attr_runtime.attr, |
| 151 | &efi_attr_config_table.attr, |
Steve McIntyre | 2859dff | 2015-01-09 15:29:53 +0000 | [diff] [blame] | 152 | &efi_attr_fw_platform_size.attr, |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 153 | NULL, |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 154 | }; |
| 155 | |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 156 | static umode_t efi_attr_is_visible(struct kobject *kobj, |
| 157 | struct attribute *attr, int n) |
| 158 | { |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 159 | if (attr == &efi_attr_fw_vendor.attr) { |
| 160 | if (efi_enabled(EFI_PARAVIRT) || |
| 161 | efi.fw_vendor == EFI_INVALID_TABLE_ADDR) |
| 162 | return 0; |
| 163 | } else if (attr == &efi_attr_runtime.attr) { |
| 164 | if (efi.runtime == EFI_INVALID_TABLE_ADDR) |
| 165 | return 0; |
| 166 | } else if (attr == &efi_attr_config_table.attr) { |
| 167 | if (efi.config_table == EFI_INVALID_TABLE_ADDR) |
| 168 | return 0; |
| 169 | } |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 170 | |
Daniel Kiper | 9f27bc5 | 2014-06-30 19:52:58 +0200 | [diff] [blame] | 171 | return attr->mode; |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 172 | } |
| 173 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 174 | static struct attribute_group efi_subsys_attr_group = { |
| 175 | .attrs = efi_subsys_attrs, |
Dave Young | a0998eb | 2013-12-20 18:02:17 +0800 | [diff] [blame] | 176 | .is_visible = efi_attr_is_visible, |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 177 | }; |
| 178 | |
| 179 | static struct efivars generic_efivars; |
| 180 | static struct efivar_operations generic_ops; |
| 181 | |
| 182 | static int generic_ops_register(void) |
| 183 | { |
| 184 | generic_ops.get_variable = efi.get_variable; |
| 185 | generic_ops.set_variable = efi.set_variable; |
Ard Biesheuvel | 9c6672a | 2016-02-01 22:06:55 +0000 | [diff] [blame] | 186 | generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 187 | generic_ops.get_next_variable = efi.get_next_variable; |
Matt Fleming | a614e19 | 2013-04-30 11:30:24 +0100 | [diff] [blame] | 188 | generic_ops.query_variable_store = efi_query_variable_store; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 189 | |
| 190 | return efivars_register(&generic_efivars, &generic_ops, efi_kobj); |
| 191 | } |
| 192 | |
| 193 | static void generic_ops_unregister(void) |
| 194 | { |
| 195 | efivars_unregister(&generic_efivars); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * We register the efi subsystem with the firmware subsystem and the |
| 200 | * efivars subsystem with the efi subsystem, if the system was booted with |
| 201 | * EFI. |
| 202 | */ |
| 203 | static int __init efisubsys_init(void) |
| 204 | { |
| 205 | int error; |
| 206 | |
| 207 | if (!efi_enabled(EFI_BOOT)) |
| 208 | return 0; |
| 209 | |
| 210 | /* We register the efi directory at /sys/firmware/efi */ |
| 211 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); |
| 212 | if (!efi_kobj) { |
| 213 | pr_err("efi: Firmware registration failed.\n"); |
| 214 | return -ENOMEM; |
| 215 | } |
| 216 | |
| 217 | error = generic_ops_register(); |
| 218 | if (error) |
| 219 | goto err_put; |
| 220 | |
| 221 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); |
| 222 | if (error) { |
| 223 | pr_err("efi: Sysfs attribute export failed with error %d.\n", |
| 224 | error); |
| 225 | goto err_unregister; |
| 226 | } |
| 227 | |
Dave Young | 926172d | 2013-12-20 18:02:18 +0800 | [diff] [blame] | 228 | error = efi_runtime_map_init(efi_kobj); |
| 229 | if (error) |
| 230 | goto err_remove_group; |
| 231 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 232 | /* and the standard mountpoint for efivarfs */ |
Eric W. Biederman | f9bb488 | 2015-05-13 17:35:41 -0500 | [diff] [blame] | 233 | error = sysfs_create_mount_point(efi_kobj, "efivars"); |
| 234 | if (error) { |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 235 | pr_err("efivars: Subsystem registration failed.\n"); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 236 | goto err_remove_group; |
| 237 | } |
| 238 | |
| 239 | return 0; |
| 240 | |
| 241 | err_remove_group: |
| 242 | sysfs_remove_group(efi_kobj, &efi_subsys_attr_group); |
| 243 | err_unregister: |
| 244 | generic_ops_unregister(); |
| 245 | err_put: |
| 246 | kobject_put(efi_kobj); |
| 247 | return error; |
| 248 | } |
| 249 | |
| 250 | subsys_initcall(efisubsys_init); |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 251 | |
Peter Jones | 0bb5490 | 2015-04-28 18:44:31 -0400 | [diff] [blame] | 252 | /* |
| 253 | * Find the efi memory descriptor for a given physical address. Given a |
| 254 | * physicall address, determine if it exists within an EFI Memory Map entry, |
| 255 | * and if so, populate the supplied memory descriptor with the appropriate |
| 256 | * data. |
| 257 | */ |
| 258 | int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) |
| 259 | { |
Matt Fleming | 884f4f6 | 2016-04-25 21:06:39 +0100 | [diff] [blame] | 260 | struct efi_memory_map *map = &efi.memmap; |
Ard Biesheuvel | 44511fb | 2015-10-23 11:48:16 +0200 | [diff] [blame] | 261 | phys_addr_t p, e; |
Peter Jones | 0bb5490 | 2015-04-28 18:44:31 -0400 | [diff] [blame] | 262 | |
| 263 | if (!efi_enabled(EFI_MEMMAP)) { |
| 264 | pr_err_once("EFI_MEMMAP is not enabled.\n"); |
| 265 | return -EINVAL; |
| 266 | } |
| 267 | |
| 268 | if (!map) { |
| 269 | pr_err_once("efi.memmap is not set.\n"); |
| 270 | return -EINVAL; |
| 271 | } |
| 272 | if (!out_md) { |
| 273 | pr_err_once("out_md is null.\n"); |
| 274 | return -EINVAL; |
| 275 | } |
| 276 | if (WARN_ON_ONCE(!map->phys_map)) |
| 277 | return -EINVAL; |
| 278 | if (WARN_ON_ONCE(map->nr_map == 0) || WARN_ON_ONCE(map->desc_size == 0)) |
| 279 | return -EINVAL; |
| 280 | |
| 281 | e = map->phys_map + map->nr_map * map->desc_size; |
| 282 | for (p = map->phys_map; p < e; p += map->desc_size) { |
| 283 | efi_memory_desc_t *md; |
| 284 | u64 size; |
| 285 | u64 end; |
| 286 | |
| 287 | /* |
| 288 | * If a driver calls this after efi_free_boot_services, |
| 289 | * ->map will be NULL, and the target may also not be mapped. |
| 290 | * So just always get our own virtual map on the CPU. |
| 291 | * |
| 292 | */ |
Ard Biesheuvel | 44511fb | 2015-10-23 11:48:16 +0200 | [diff] [blame] | 293 | md = early_memremap(p, sizeof (*md)); |
Peter Jones | 0bb5490 | 2015-04-28 18:44:31 -0400 | [diff] [blame] | 294 | if (!md) { |
Ard Biesheuvel | 44511fb | 2015-10-23 11:48:16 +0200 | [diff] [blame] | 295 | pr_err_once("early_memremap(%pa, %zu) failed.\n", |
| 296 | &p, sizeof (*md)); |
Peter Jones | 0bb5490 | 2015-04-28 18:44:31 -0400 | [diff] [blame] | 297 | return -ENOMEM; |
| 298 | } |
| 299 | |
| 300 | if (!(md->attribute & EFI_MEMORY_RUNTIME) && |
| 301 | md->type != EFI_BOOT_SERVICES_DATA && |
| 302 | md->type != EFI_RUNTIME_SERVICES_DATA) { |
| 303 | early_memunmap(md, sizeof (*md)); |
| 304 | continue; |
| 305 | } |
| 306 | |
| 307 | size = md->num_pages << EFI_PAGE_SHIFT; |
| 308 | end = md->phys_addr + size; |
| 309 | if (phys_addr >= md->phys_addr && phys_addr < end) { |
| 310 | memcpy(out_md, md, sizeof(*out_md)); |
| 311 | early_memunmap(md, sizeof (*md)); |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | early_memunmap(md, sizeof (*md)); |
| 316 | } |
| 317 | pr_err_once("requested map not found.\n"); |
| 318 | return -ENOENT; |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Calculate the highest address of an efi memory descriptor. |
| 323 | */ |
| 324 | u64 __init efi_mem_desc_end(efi_memory_desc_t *md) |
| 325 | { |
| 326 | u64 size = md->num_pages << EFI_PAGE_SHIFT; |
| 327 | u64 end = md->phys_addr + size; |
| 328 | return end; |
| 329 | } |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 330 | |
| 331 | static __initdata efi_config_table_type_t common_tables[] = { |
| 332 | {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20}, |
| 333 | {ACPI_TABLE_GUID, "ACPI", &efi.acpi}, |
| 334 | {HCDP_TABLE_GUID, "HCDP", &efi.hcdp}, |
| 335 | {MPS_TABLE_GUID, "MPS", &efi.mps}, |
| 336 | {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab}, |
| 337 | {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios}, |
Ard Biesheuvel | e1ccbbc | 2014-10-14 16:34:47 +0200 | [diff] [blame] | 338 | {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3}, |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 339 | {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga}, |
Peter Jones | 0bb5490 | 2015-04-28 18:44:31 -0400 | [diff] [blame] | 340 | {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt}, |
Ard Biesheuvel | bf92486 | 2015-09-09 10:08:15 +0200 | [diff] [blame] | 341 | {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table}, |
Ard Biesheuvel | a604af0 | 2016-04-25 21:06:44 +0100 | [diff] [blame] | 342 | {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table}, |
Daeseok Youn | 69e6084 | 2014-02-13 17:16:36 +0900 | [diff] [blame] | 343 | {NULL_GUID, NULL, NULL}, |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 344 | }; |
| 345 | |
| 346 | static __init int match_config_table(efi_guid_t *guid, |
| 347 | unsigned long table, |
| 348 | efi_config_table_type_t *table_types) |
| 349 | { |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 350 | int i; |
| 351 | |
| 352 | if (table_types) { |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 353 | for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) { |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 354 | if (!efi_guidcmp(*guid, table_types[i].guid)) { |
| 355 | *(table_types[i].ptr) = table; |
Ard Biesheuvel | 801820b | 2016-04-25 21:06:53 +0100 | [diff] [blame] | 356 | if (table_types[i].name) |
| 357 | pr_cont(" %s=0x%lx ", |
| 358 | table_types[i].name, table); |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 359 | return 1; |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
Ard Biesheuvel | 7bb6841 | 2014-10-18 15:04:15 +0200 | [diff] [blame] | 367 | int __init efi_config_parse_tables(void *config_tables, int count, int sz, |
| 368 | efi_config_table_type_t *arch_tables) |
| 369 | { |
| 370 | void *tablep; |
| 371 | int i; |
| 372 | |
| 373 | tablep = config_tables; |
| 374 | pr_info(""); |
| 375 | for (i = 0; i < count; i++) { |
| 376 | efi_guid_t guid; |
| 377 | unsigned long table; |
| 378 | |
| 379 | if (efi_enabled(EFI_64BIT)) { |
| 380 | u64 table64; |
| 381 | guid = ((efi_config_table_64_t *)tablep)->guid; |
| 382 | table64 = ((efi_config_table_64_t *)tablep)->table; |
| 383 | table = table64; |
| 384 | #ifndef CONFIG_64BIT |
| 385 | if (table64 >> 32) { |
| 386 | pr_cont("\n"); |
| 387 | pr_err("Table located above 4GB, disabling EFI.\n"); |
| 388 | return -EINVAL; |
| 389 | } |
| 390 | #endif |
| 391 | } else { |
| 392 | guid = ((efi_config_table_32_t *)tablep)->guid; |
| 393 | table = ((efi_config_table_32_t *)tablep)->table; |
| 394 | } |
| 395 | |
| 396 | if (!match_config_table(&guid, table, common_tables)) |
| 397 | match_config_table(&guid, table, arch_tables); |
| 398 | |
| 399 | tablep += sz; |
| 400 | } |
| 401 | pr_cont("\n"); |
| 402 | set_bit(EFI_CONFIG_TABLES, &efi.flags); |
Ard Biesheuvel | a104171 | 2015-09-23 07:29:34 -0700 | [diff] [blame] | 403 | |
| 404 | /* Parse the EFI Properties table if it exists */ |
| 405 | if (efi.properties_table != EFI_INVALID_TABLE_ADDR) { |
| 406 | efi_properties_table_t *tbl; |
| 407 | |
| 408 | tbl = early_memremap(efi.properties_table, sizeof(*tbl)); |
| 409 | if (tbl == NULL) { |
| 410 | pr_err("Could not map Properties table!\n"); |
| 411 | return -ENOMEM; |
| 412 | } |
| 413 | |
| 414 | if (tbl->memory_protection_attribute & |
| 415 | EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) |
| 416 | set_bit(EFI_NX_PE_DATA, &efi.flags); |
| 417 | |
| 418 | early_memunmap(tbl, sizeof(*tbl)); |
| 419 | } |
| 420 | |
Ard Biesheuvel | 7bb6841 | 2014-10-18 15:04:15 +0200 | [diff] [blame] | 421 | return 0; |
| 422 | } |
| 423 | |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 424 | int __init efi_config_init(efi_config_table_type_t *arch_tables) |
| 425 | { |
Ard Biesheuvel | 7bb6841 | 2014-10-18 15:04:15 +0200 | [diff] [blame] | 426 | void *config_tables; |
| 427 | int sz, ret; |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 428 | |
| 429 | if (efi_enabled(EFI_64BIT)) |
| 430 | sz = sizeof(efi_config_table_64_t); |
| 431 | else |
| 432 | sz = sizeof(efi_config_table_32_t); |
| 433 | |
| 434 | /* |
| 435 | * Let's see what config tables the firmware passed to us. |
| 436 | */ |
| 437 | config_tables = early_memremap(efi.systab->tables, |
| 438 | efi.systab->nr_tables * sz); |
| 439 | if (config_tables == NULL) { |
| 440 | pr_err("Could not map Configuration table!\n"); |
| 441 | return -ENOMEM; |
| 442 | } |
| 443 | |
Ard Biesheuvel | 7bb6841 | 2014-10-18 15:04:15 +0200 | [diff] [blame] | 444 | ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz, |
| 445 | arch_tables); |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 446 | |
Daniel Kiper | abc93f8 | 2014-06-30 19:52:56 +0200 | [diff] [blame] | 447 | early_memunmap(config_tables, efi.systab->nr_tables * sz); |
Ard Biesheuvel | 7bb6841 | 2014-10-18 15:04:15 +0200 | [diff] [blame] | 448 | return ret; |
Leif Lindholm | 272686b | 2013-09-05 11:34:54 +0100 | [diff] [blame] | 449 | } |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 450 | |
Lee, Chun-Yi | 28d5402 | 2014-07-09 18:39:29 +0800 | [diff] [blame] | 451 | #ifdef CONFIG_EFI_VARS_MODULE |
| 452 | static int __init efi_load_efivars(void) |
| 453 | { |
| 454 | struct platform_device *pdev; |
| 455 | |
| 456 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
| 457 | return 0; |
| 458 | |
| 459 | pdev = platform_device_register_simple("efivars", 0, NULL, 0); |
| 460 | return IS_ERR(pdev) ? PTR_ERR(pdev) : 0; |
| 461 | } |
| 462 | device_initcall(efi_load_efivars); |
| 463 | #endif |
| 464 | |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 465 | #ifdef CONFIG_EFI_PARAMS_FROM_FDT |
| 466 | |
| 467 | #define UEFI_PARAM(name, prop, field) \ |
| 468 | { \ |
| 469 | { name }, \ |
| 470 | { prop }, \ |
| 471 | offsetof(struct efi_fdt_params, field), \ |
| 472 | FIELD_SIZEOF(struct efi_fdt_params, field) \ |
| 473 | } |
| 474 | |
| 475 | static __initdata struct { |
| 476 | const char name[32]; |
| 477 | const char propname[32]; |
| 478 | int offset; |
| 479 | int size; |
| 480 | } dt_params[] = { |
| 481 | UEFI_PARAM("System Table", "linux,uefi-system-table", system_table), |
| 482 | UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap), |
| 483 | UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size), |
| 484 | UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size), |
| 485 | UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) |
| 486 | }; |
| 487 | |
| 488 | struct param_info { |
Catalin Marinas | 29e2435 | 2014-07-08 16:54:18 +0100 | [diff] [blame] | 489 | int found; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 490 | void *params; |
| 491 | }; |
| 492 | |
| 493 | static int __init fdt_find_uefi_params(unsigned long node, const char *uname, |
| 494 | int depth, void *data) |
| 495 | { |
| 496 | struct param_info *info = data; |
Catalin Marinas | 6fb8cc8 | 2014-06-02 11:31:06 +0100 | [diff] [blame] | 497 | const void *prop; |
| 498 | void *dest; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 499 | u64 val; |
Catalin Marinas | 6fb8cc8 | 2014-06-02 11:31:06 +0100 | [diff] [blame] | 500 | int i, len; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 501 | |
Leif Lindholm | 1162930 | 2015-01-20 16:34:38 +0000 | [diff] [blame] | 502 | if (depth != 1 || strcmp(uname, "chosen") != 0) |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 503 | return 0; |
| 504 | |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 505 | for (i = 0; i < ARRAY_SIZE(dt_params); i++) { |
| 506 | prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len); |
Catalin Marinas | 29e2435 | 2014-07-08 16:54:18 +0100 | [diff] [blame] | 507 | if (!prop) |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 508 | return 0; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 509 | dest = info->params + dt_params[i].offset; |
Catalin Marinas | 29e2435 | 2014-07-08 16:54:18 +0100 | [diff] [blame] | 510 | info->found++; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 511 | |
| 512 | val = of_read_number(prop, len / sizeof(u32)); |
| 513 | |
| 514 | if (dt_params[i].size == sizeof(u32)) |
| 515 | *(u32 *)dest = val; |
| 516 | else |
| 517 | *(u64 *)dest = val; |
| 518 | |
Leif Lindholm | 7968c0e | 2015-08-26 14:24:58 +0100 | [diff] [blame] | 519 | if (efi_enabled(EFI_DBG)) |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 520 | pr_info(" %s: 0x%0*llx\n", dt_params[i].name, |
| 521 | dt_params[i].size * 2, val); |
| 522 | } |
| 523 | return 1; |
| 524 | } |
| 525 | |
Leif Lindholm | 7968c0e | 2015-08-26 14:24:58 +0100 | [diff] [blame] | 526 | int __init efi_get_fdt_params(struct efi_fdt_params *params) |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 527 | { |
| 528 | struct param_info info; |
Catalin Marinas | 29e2435 | 2014-07-08 16:54:18 +0100 | [diff] [blame] | 529 | int ret; |
| 530 | |
| 531 | pr_info("Getting EFI parameters from FDT:\n"); |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 532 | |
Catalin Marinas | 29e2435 | 2014-07-08 16:54:18 +0100 | [diff] [blame] | 533 | info.found = 0; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 534 | info.params = params; |
| 535 | |
Catalin Marinas | 29e2435 | 2014-07-08 16:54:18 +0100 | [diff] [blame] | 536 | ret = of_scan_flat_dt(fdt_find_uefi_params, &info); |
| 537 | if (!info.found) |
| 538 | pr_info("UEFI not found.\n"); |
| 539 | else if (!ret) |
| 540 | pr_err("Can't find '%s' in device tree!\n", |
| 541 | dt_params[info.found].name); |
| 542 | |
| 543 | return ret; |
Mark Salter | 0302f71 | 2013-12-30 12:12:12 -0500 | [diff] [blame] | 544 | } |
| 545 | #endif /* CONFIG_EFI_PARAMS_FROM_FDT */ |
Laszlo Ersek | 98d2a6c | 2014-09-03 13:32:20 +0200 | [diff] [blame] | 546 | |
| 547 | static __initdata char memory_type_name[][20] = { |
| 548 | "Reserved", |
| 549 | "Loader Code", |
| 550 | "Loader Data", |
| 551 | "Boot Code", |
| 552 | "Boot Data", |
| 553 | "Runtime Code", |
| 554 | "Runtime Data", |
| 555 | "Conventional Memory", |
| 556 | "Unusable Memory", |
| 557 | "ACPI Reclaim Memory", |
| 558 | "ACPI Memory NVS", |
| 559 | "Memory Mapped I/O", |
| 560 | "MMIO Port Space", |
Robert Elliott | 35575e0 | 2016-02-01 22:07:07 +0000 | [diff] [blame] | 561 | "PAL Code", |
| 562 | "Persistent Memory", |
Laszlo Ersek | 98d2a6c | 2014-09-03 13:32:20 +0200 | [diff] [blame] | 563 | }; |
| 564 | |
| 565 | char * __init efi_md_typeattr_format(char *buf, size_t size, |
| 566 | const efi_memory_desc_t *md) |
| 567 | { |
| 568 | char *pos; |
| 569 | int type_len; |
| 570 | u64 attr; |
| 571 | |
| 572 | pos = buf; |
| 573 | if (md->type >= ARRAY_SIZE(memory_type_name)) |
| 574 | type_len = snprintf(pos, size, "[type=%u", md->type); |
| 575 | else |
| 576 | type_len = snprintf(pos, size, "[%-*s", |
| 577 | (int)(sizeof(memory_type_name[0]) - 1), |
| 578 | memory_type_name[md->type]); |
| 579 | if (type_len >= size) |
| 580 | return buf; |
| 581 | |
| 582 | pos += type_len; |
| 583 | size -= type_len; |
| 584 | |
| 585 | attr = md->attribute; |
| 586 | if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT | |
Ard Biesheuvel | 87db73ae | 2015-08-07 09:36:54 +0100 | [diff] [blame] | 587 | EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO | |
| 588 | EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP | |
Robert Elliott | c016ca0 | 2016-02-01 22:07:06 +0000 | [diff] [blame] | 589 | EFI_MEMORY_NV | |
Taku Izumi | 8be4432 | 2015-08-27 02:11:19 +0900 | [diff] [blame] | 590 | EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE)) |
Laszlo Ersek | 98d2a6c | 2014-09-03 13:32:20 +0200 | [diff] [blame] | 591 | snprintf(pos, size, "|attr=0x%016llx]", |
| 592 | (unsigned long long)attr); |
| 593 | else |
Robert Elliott | c016ca0 | 2016-02-01 22:07:06 +0000 | [diff] [blame] | 594 | snprintf(pos, size, |
| 595 | "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]", |
Laszlo Ersek | 98d2a6c | 2014-09-03 13:32:20 +0200 | [diff] [blame] | 596 | attr & EFI_MEMORY_RUNTIME ? "RUN" : "", |
Taku Izumi | 8be4432 | 2015-08-27 02:11:19 +0900 | [diff] [blame] | 597 | attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "", |
Robert Elliott | c016ca0 | 2016-02-01 22:07:06 +0000 | [diff] [blame] | 598 | attr & EFI_MEMORY_NV ? "NV" : "", |
Laszlo Ersek | 98d2a6c | 2014-09-03 13:32:20 +0200 | [diff] [blame] | 599 | attr & EFI_MEMORY_XP ? "XP" : "", |
| 600 | attr & EFI_MEMORY_RP ? "RP" : "", |
| 601 | attr & EFI_MEMORY_WP ? "WP" : "", |
Ard Biesheuvel | 87db73ae | 2015-08-07 09:36:54 +0100 | [diff] [blame] | 602 | attr & EFI_MEMORY_RO ? "RO" : "", |
Laszlo Ersek | 98d2a6c | 2014-09-03 13:32:20 +0200 | [diff] [blame] | 603 | attr & EFI_MEMORY_UCE ? "UCE" : "", |
| 604 | attr & EFI_MEMORY_WB ? "WB" : "", |
| 605 | attr & EFI_MEMORY_WT ? "WT" : "", |
| 606 | attr & EFI_MEMORY_WC ? "WC" : "", |
| 607 | attr & EFI_MEMORY_UC ? "UC" : ""); |
| 608 | return buf; |
| 609 | } |
Jonathan (Zhixiong) Zhang | 7bf7931 | 2015-08-07 09:36:57 +0100 | [diff] [blame] | 610 | |
| 611 | /* |
| 612 | * efi_mem_attributes - lookup memmap attributes for physical address |
| 613 | * @phys_addr: the physical address to lookup |
| 614 | * |
| 615 | * Search in the EFI memory map for the region covering |
| 616 | * @phys_addr. Returns the EFI memory attributes if the region |
| 617 | * was found in the memory map, 0 otherwise. |
| 618 | * |
| 619 | * Despite being marked __weak, most architectures should *not* |
| 620 | * override this function. It is __weak solely for the benefit |
| 621 | * of ia64 which has a funky EFI memory map that doesn't work |
| 622 | * the same way as other architectures. |
| 623 | */ |
| 624 | u64 __weak efi_mem_attributes(unsigned long phys_addr) |
| 625 | { |
| 626 | efi_memory_desc_t *md; |
Jonathan (Zhixiong) Zhang | 7bf7931 | 2015-08-07 09:36:57 +0100 | [diff] [blame] | 627 | |
| 628 | if (!efi_enabled(EFI_MEMMAP)) |
| 629 | return 0; |
| 630 | |
Matt Fleming | 78ce248 | 2016-04-25 21:06:38 +0100 | [diff] [blame] | 631 | for_each_efi_memory_desc(md) { |
Jonathan (Zhixiong) Zhang | 7bf7931 | 2015-08-07 09:36:57 +0100 | [diff] [blame] | 632 | if ((md->phys_addr <= phys_addr) && |
| 633 | (phys_addr < (md->phys_addr + |
| 634 | (md->num_pages << EFI_PAGE_SHIFT)))) |
| 635 | return md->attribute; |
| 636 | } |
| 637 | return 0; |
| 638 | } |
Matt Fleming | 806b035 | 2016-04-25 21:06:58 +0100 | [diff] [blame^] | 639 | |
| 640 | int efi_status_to_err(efi_status_t status) |
| 641 | { |
| 642 | int err; |
| 643 | |
| 644 | switch (status) { |
| 645 | case EFI_SUCCESS: |
| 646 | err = 0; |
| 647 | break; |
| 648 | case EFI_INVALID_PARAMETER: |
| 649 | err = -EINVAL; |
| 650 | break; |
| 651 | case EFI_OUT_OF_RESOURCES: |
| 652 | err = -ENOSPC; |
| 653 | break; |
| 654 | case EFI_DEVICE_ERROR: |
| 655 | err = -EIO; |
| 656 | break; |
| 657 | case EFI_WRITE_PROTECTED: |
| 658 | err = -EROFS; |
| 659 | break; |
| 660 | case EFI_SECURITY_VIOLATION: |
| 661 | err = -EACCES; |
| 662 | break; |
| 663 | case EFI_NOT_FOUND: |
| 664 | err = -ENOENT; |
| 665 | break; |
| 666 | default: |
| 667 | err = -EINVAL; |
| 668 | } |
| 669 | |
| 670 | return err; |
| 671 | } |