arch/x86/platform/efi/efi.c

   1 /*
   2  * Common EFI (Extensible Firmware Interface) support functions
   3  * Based on Extensible Firmware Interface Specification version 1.0
   4  *
   5  * Copyright (C) 1999 VA Linux Systems
   6  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   7  * Copyright (C) 1999-2002 Hewlett-Packard Co.
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  *      Stephane Eranian <eranian@hpl.hp.com>
  10  * Copyright (C) 2005-2008 Intel Co.
  11  *      Fenghua Yu <fenghua.yu@intel.com>
  12  *      Bibo Mao <bibo.mao@intel.com>
  13  *      Chandramouli Narayanan <mouli@linux.intel.com>
  14  *      Huang Ying <ying.huang@intel.com>
  15  *
  16  * Copied from efi_32.c to eliminate the duplicated code between EFI
  17  * 32/64 support code. --ying 2007-10-26
  18  *
  19  * All EFI Runtime Services are not implemented yet as EFI only
  20  * supports physical mode addressing on SoftSDV. This is to be fixed
  21  * in a future version.  --drummond 1999-07-20
  22  *
  23  * Implemented EFI runtime services and virtual mode calls.  --davidm
  24  *
  25  * Goutham Rao: <goutham.rao@intel.com>
  26  *      Skip non-WB memory and ignore empty memory ranges.
  27  */
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/kernel.h>
  32 #include <linux/init.h>
  33 #include <linux/efi.h>
  34 #include <linux/efi-bgrt.h>
  35 #include <linux/export.h>
  36 #include <linux/bootmem.h>
  37 #include <linux/slab.h>
  38 #include <linux/memblock.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/time.h>
  42 #include <linux/io.h>
  43 #include <linux/reboot.h>
  44 #include <linux/bcd.h>
  45
  46 #include <asm/setup.h>
  47 #include <asm/efi.h>
  48 #include <asm/time.h>
  49 #include <asm/cacheflush.h>
  50 #include <asm/tlbflush.h>
  51 #include <asm/x86_init.h>
  52 #include <asm/rtc.h>
  53
  54 #define EFI_DEBUG       1
  55
  56 #define EFI_MIN_RESERVE 5120
  57
  58 #define EFI_DUMMY_GUID \
  59         EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9)
  60
  61 static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
  62
  63 struct efi_memory_map memmap;
  64
  65 static struct efi efi_phys __initdata;
  66 static efi_system_table_t efi_systab __initdata;
  67
  68 unsigned long x86_efi_facility;
  69
  70 static __initdata efi_config_table_type_t arch_tables[] = {
  71 #ifdef CONFIG_X86_UV
  72         {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
  73 #endif
  74         {NULL_GUID, NULL, 0},
  75 };
  76
  77 /*
  78  * Returns 1 if 'facility' is enabled, 0 otherwise.
  79  */
  80 int efi_enabled(int facility)
  81 {
  82         return test_bit(facility, &x86_efi_facility) != 0;
  83 }
  84 EXPORT_SYMBOL(efi_enabled);
  85
  86 static bool __initdata disable_runtime = false;
  87 static int __init setup_noefi(char *arg)
  88 {
  89         disable_runtime = true;
  90         return 0;
  91 }
  92 early_param("noefi", setup_noefi);
  93
  94 int add_efi_memmap;
  95 EXPORT_SYMBOL(add_efi_memmap);
  96
  97 static int __init setup_add_efi_memmap(char *arg)
  98 {
  99         add_efi_memmap = 1;
 100         return 0;
 101 }
 102 early_param("add_efi_memmap", setup_add_efi_memmap);
 103
 104 static bool efi_no_storage_paranoia;
 105
 106 static int __init setup_storage_paranoia(char *arg)
 107 {
 108         efi_no_storage_paranoia = true;
 109         return 0;
 110 }
 111 early_param("efi_no_storage_paranoia", setup_storage_paranoia);
 112
 113
 114 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 115 {
 116         unsigned long flags;
 117         efi_status_t status;
 118
 119         spin_lock_irqsave(&rtc_lock, flags);
 120         status = efi_call_virt2(get_time, tm, tc);
 121         spin_unlock_irqrestore(&rtc_lock, flags);
 122         return status;
 123 }
 124
 125 static efi_status_t virt_efi_set_time(efi_time_t *tm)
 126 {
 127         unsigned long flags;
 128         efi_status_t status;
 129
 130         spin_lock_irqsave(&rtc_lock, flags);
 131         status = efi_call_virt1(set_time, tm);
 132         spin_unlock_irqrestore(&rtc_lock, flags);
 133         return status;
 134 }
 135
 136 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
 137                                              efi_bool_t *pending,
 138                                              efi_time_t *tm)
 139 {
 140         unsigned long flags;
 141         efi_status_t status;
 142
 143         spin_lock_irqsave(&rtc_lock, flags);
 144         status = efi_call_virt3(get_wakeup_time,
 145                                 enabled, pending, tm);
 146         spin_unlock_irqrestore(&rtc_lock, flags);
 147         return status;
 148 }
 149
 150 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 151 {
 152         unsigned long flags;
 153         efi_status_t status;
 154
 155         spin_lock_irqsave(&rtc_lock, flags);
 156         status = efi_call_virt2(set_wakeup_time,
 157                                 enabled, tm);
 158         spin_unlock_irqrestore(&rtc_lock, flags);
 159         return status;
 160 }
 161
 162 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 163                                           efi_guid_t *vendor,
 164                                           u32 *attr,
 165                                           unsigned long *data_size,
 166                                           void *data)
 167 {
 168         return efi_call_virt5(get_variable,
 169                               name, vendor, attr,
 170                               data_size, data);
 171 }
 172
 173 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 174                                                efi_char16_t *name,
 175                                                efi_guid_t *vendor)
 176 {
 177         return efi_call_virt3(get_next_variable,
 178                               name_size, name, vendor);
 179 }
 180
 181 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 182                                           efi_guid_t *vendor,
 183                                           u32 attr,
 184                                           unsigned long data_size,
 185                                           void *data)
 186 {
 187         return efi_call_virt5(set_variable,
 188                               name, vendor, attr,
 189                               data_size, data);
 190 }
 191
 192 static efi_status_t virt_efi_query_variable_info(u32 attr,
 193                                                  u64 *storage_space,
 194                                                  u64 *remaining_space,
 195                                                  u64 *max_variable_size)
 196 {
 197         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 198                 return EFI_UNSUPPORTED;
 199
 200         return efi_call_virt4(query_variable_info, attr, storage_space,
 201                               remaining_space, max_variable_size);
 202 }
 203
 204 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 205 {
 206         return efi_call_virt1(get_next_high_mono_count, count);
 207 }
 208
 209 static void virt_efi_reset_system(int reset_type,
 210                                   efi_status_t status,
 211                                   unsigned long data_size,
 212                                   efi_char16_t *data)
 213 {
 214         efi_call_virt4(reset_system, reset_type, status,
 215                        data_size, data);
 216 }
 217
 218 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
 219                                             unsigned long count,
 220                                             unsigned long sg_list)
 221 {
 222         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 223                 return EFI_UNSUPPORTED;
 224
 225         return efi_call_virt3(update_capsule, capsules, count, sg_list);
 226 }
 227
 228 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 229                                                 unsigned long count,
 230                                                 u64 *max_size,
 231                                                 int *reset_type)
 232 {
 233         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 234                 return EFI_UNSUPPORTED;
 235
 236         return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
 237                               reset_type);
 238 }
 239
 240 static efi_status_t __init phys_efi_set_virtual_address_map(
 241         unsigned long memory_map_size,
 242         unsigned long descriptor_size,
 243         u32 descriptor_version,
 244         efi_memory_desc_t *virtual_map)
 245 {
 246         efi_status_t status;
 247
 248         efi_call_phys_prelog();
 249         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 250                                 memory_map_size, descriptor_size,
 251                                 descriptor_version, virtual_map);
 252         efi_call_phys_epilog();
 253         return status;
 254 }
 255
 256 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 257                                              efi_time_cap_t *tc)
 258 {
 259         unsigned long flags;
 260         efi_status_t status;
 261
 262         spin_lock_irqsave(&rtc_lock, flags);
 263         efi_call_phys_prelog();
 264         status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
 265                                 virt_to_phys(tc));
 266         efi_call_phys_epilog();
 267         spin_unlock_irqrestore(&rtc_lock, flags);
 268         return status;
 269 }
 270
 271 int efi_set_rtc_mmss(unsigned long nowtime)
 272 {
 273         efi_status_t    status;
 274         efi_time_t      eft;
 275         efi_time_cap_t  cap;
 276         struct rtc_time tm;
 277
 278         status = efi.get_time(&eft, &cap);
 279         if (status != EFI_SUCCESS) {
 280                 pr_err("Oops: efitime: can't read time!\n");
 281                 return -1;
 282         }
 283
 284         rtc_time_to_tm(nowtime, &tm);
 285         if (!rtc_valid_tm(&tm)) {
 286                 eft.year = tm.tm_year + 1900;
 287                 eft.month = tm.tm_mon + 1;
 288                 eft.day = tm.tm_mday;
 289                 eft.minute = tm.tm_min;
 290                 eft.second = tm.tm_sec;
 291                 eft.nanosecond = 0;
 292         } else {
 293                 printk(KERN_ERR
 294                        "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
 295                        __FUNCTION__, nowtime);
 296                 return -1;
 297         }
 298
 299         status = efi.set_time(&eft);
 300         if (status != EFI_SUCCESS) {
 301                 pr_err("Oops: efitime: can't write time!\n");
 302                 return -1;
 303         }
 304         return 0;
 305 }
 306
 307 unsigned long efi_get_time(void)
 308 {
 309         efi_status_t status;
 310         efi_time_t eft;
 311         efi_time_cap_t cap;
 312
 313         status = efi.get_time(&eft, &cap);
 314         if (status != EFI_SUCCESS)
 315                 pr_err("Oops: efitime: can't read time!\n");
 316
 317         return mktime(eft.year, eft.month, eft.day, eft.hour,
 318                       eft.minute, eft.second);
 319 }
 320
 321 /*
 322  * Tell the kernel about the EFI memory map.  This might include
 323  * more than the max 128 entries that can fit in the e820 legacy
 324  * (zeropage) memory map.
 325  */
 326
 327 static void __init do_add_efi_memmap(void)
 328 {
 329         void *p;
 330
 331         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 332                 efi_memory_desc_t *md = p;
 333                 unsigned long long start = md->phys_addr;
 334                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 335                 int e820_type;
 336
 337                 switch (md->type) {
 338                 case EFI_LOADER_CODE:
 339                 case EFI_LOADER_DATA:
 340                 case EFI_BOOT_SERVICES_CODE:
 341                 case EFI_BOOT_SERVICES_DATA:
 342                 case EFI_CONVENTIONAL_MEMORY:
 343                         if (md->attribute & EFI_MEMORY_WB)
 344                                 e820_type = E820_RAM;
 345                         else
 346                                 e820_type = E820_RESERVED;
 347                         break;
 348                 case EFI_ACPI_RECLAIM_MEMORY:
 349                         e820_type = E820_ACPI;
 350                         break;
 351                 case EFI_ACPI_MEMORY_NVS:
 352                         e820_type = E820_NVS;
 353                         break;
 354                 case EFI_UNUSABLE_MEMORY:
 355                         e820_type = E820_UNUSABLE;
 356                         break;
 357                 default:
 358                         /*
 359                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 360                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 361                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 362                          */
 363                         e820_type = E820_RESERVED;
 364                         break;
 365                 }
 366                 e820_add_region(start, size, e820_type);
 367         }
 368         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 369 }
 370
 371 int __init efi_memblock_x86_reserve_range(void)
 372 {
 373         struct efi_info *e = &boot_params.efi_info;
 374         unsigned long pmap;
 375
 376 #ifdef CONFIG_X86_32
 377         /* Can't handle data above 4GB at this time */
 378         if (e->efi_memmap_hi) {
 379                 pr_err("Memory map is above 4GB, disabling EFI.\n");
 380                 return -EINVAL;
 381         }
 382         pmap =  e->efi_memmap;
 383 #else
 384         pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
 385 #endif
 386         memmap.phys_map         = (void *)pmap;
 387         memmap.nr_map           = e->efi_memmap_size /
 388                                   e->efi_memdesc_size;
 389         memmap.desc_size        = e->efi_memdesc_size;
 390         memmap.desc_version     = e->efi_memdesc_version;
 391
 392         memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
 393
 394         return 0;
 395 }
 396
 397 #if EFI_DEBUG
 398 static void __init print_efi_memmap(void)
 399 {
 400         efi_memory_desc_t *md;
 401         void *p;
 402         int i;
 403
 404         for (p = memmap.map, i = 0;
 405              p < memmap.map_end;
 406              p += memmap.desc_size, i++) {
 407                 md = p;
 408                 pr_info("mem%02u: type=%u, attr=0x%llx, "
 409                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 410                         i, md->type, md->attribute, md->phys_addr,
 411                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 412                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 413         }
 414 }
 415 #endif  /*  EFI_DEBUG  */
 416
 417 void __init efi_reserve_boot_services(void)
 418 {
 419         void *p;
 420
 421         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 422                 efi_memory_desc_t *md = p;
 423                 u64 start = md->phys_addr;
 424                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 425
 426                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 427                     md->type != EFI_BOOT_SERVICES_DATA)
 428                         continue;
 429                 /* Only reserve where possible:
 430                  * - Not within any already allocated areas
 431                  * - Not over any memory area (really needed, if above?)
 432                  * - Not within any part of the kernel
 433                  * - Not the bios reserved area
 434                 */
 435                 if ((start+size >= __pa_symbol(_text)
 436                                 && start <= __pa_symbol(_end)) ||
 437                         !e820_all_mapped(start, start+size, E820_RAM) ||
 438                         memblock_is_region_reserved(start, size)) {
 439                         /* Could not reserve, skip it */
 440                         md->num_pages = 0;
 441                         memblock_dbg("Could not reserve boot range "
 442                                         "[0x%010llx-0x%010llx]\n",
 443                                                 start, start+size-1);
 444                 } else
 445                         memblock_reserve(start, size);
 446         }
 447 }
 448
 449 void __init efi_unmap_memmap(void)
 450 {
 451         clear_bit(EFI_MEMMAP, &x86_efi_facility);
 452         if (memmap.map) {
 453                 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 454                 memmap.map = NULL;
 455         }
 456 }
 457
 458 void __init efi_free_boot_services(void)
 459 {
 460         void *p;
 461
 462         if (!efi_is_native())
 463                 return;
 464
 465         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 466                 efi_memory_desc_t *md = p;
 467                 unsigned long long start = md->phys_addr;
 468                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 469
 470                 if (md->type != EFI_BOOT_SERVICES_CODE &&
 471                     md->type != EFI_BOOT_SERVICES_DATA)
 472                         continue;
 473
 474                 /* Could not reserve boot area */
 475                 if (!size)
 476                         continue;
 477
 478                 free_bootmem_late(start, size);
 479         }
 480
 481         efi_unmap_memmap();
 482 }
 483
 484 static int __init efi_systab_init(void *phys)
 485 {
 486         if (efi_enabled(EFI_64BIT)) {
 487                 efi_system_table_64_t *systab64;
 488                 u64 tmp = 0;
 489
 490                 systab64 = early_ioremap((unsigned long)phys,
 491                                          sizeof(*systab64));
 492                 if (systab64 == NULL) {
 493                         pr_err("Couldn't map the system table!\n");
 494                         return -ENOMEM;
 495                 }
 496
 497                 efi_systab.hdr = systab64->hdr;
 498                 efi_systab.fw_vendor = systab64->fw_vendor;
 499                 tmp |= systab64->fw_vendor;
 500                 efi_systab.fw_revision = systab64->fw_revision;
 501                 efi_systab.con_in_handle = systab64->con_in_handle;
 502                 tmp |= systab64->con_in_handle;
 503                 efi_systab.con_in = systab64->con_in;
 504                 tmp |= systab64->con_in;
 505                 efi_systab.con_out_handle = systab64->con_out_handle;
 506                 tmp |= systab64->con_out_handle;
 507                 efi_systab.con_out = systab64->con_out;
 508                 tmp |= systab64->con_out;
 509                 efi_systab.stderr_handle = systab64->stderr_handle;
 510                 tmp |= systab64->stderr_handle;
 511                 efi_systab.stderr = systab64->stderr;
 512                 tmp |= systab64->stderr;
 513                 efi_systab.runtime = (void *)(unsigned long)systab64->runtime;
 514                 tmp |= systab64->runtime;
 515                 efi_systab.boottime = (void *)(unsigned long)systab64->boottime;
 516                 tmp |= systab64->boottime;
 517                 efi_systab.nr_tables = systab64->nr_tables;
 518                 efi_systab.tables = systab64->tables;
 519                 tmp |= systab64->tables;
 520
 521                 early_iounmap(systab64, sizeof(*systab64));
 522 #ifdef CONFIG_X86_32
 523                 if (tmp >> 32) {
 524                         pr_err("EFI data located above 4GB, disabling EFI.\n");
 525                         return -EINVAL;
 526                 }
 527 #endif
 528         } else {
 529                 efi_system_table_32_t *systab32;
 530
 531                 systab32 = early_ioremap((unsigned long)phys,
 532                                          sizeof(*systab32));
 533                 if (systab32 == NULL) {
 534                         pr_err("Couldn't map the system table!\n");
 535                         return -ENOMEM;
 536                 }
 537
 538                 efi_systab.hdr = systab32->hdr;
 539                 efi_systab.fw_vendor = systab32->fw_vendor;
 540                 efi_systab.fw_revision = systab32->fw_revision;
 541                 efi_systab.con_in_handle = systab32->con_in_handle;
 542                 efi_systab.con_in = systab32->con_in;
 543                 efi_systab.con_out_handle = systab32->con_out_handle;
 544                 efi_systab.con_out = systab32->con_out;
 545                 efi_systab.stderr_handle = systab32->stderr_handle;
 546                 efi_systab.stderr = systab32->stderr;
 547                 efi_systab.runtime = (void *)(unsigned long)systab32->runtime;
 548                 efi_systab.boottime = (void *)(unsigned long)systab32->boottime;
 549                 efi_systab.nr_tables = systab32->nr_tables;
 550                 efi_systab.tables = systab32->tables;
 551
 552                 early_iounmap(systab32, sizeof(*systab32));
 553         }
 554
 555         efi.systab = &efi_systab;
 556
 557         /*
 558          * Verify the EFI Table
 559          */
 560         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) {
 561                 pr_err("System table signature incorrect!\n");
 562                 return -EINVAL;
 563         }
 564         if ((efi.systab->hdr.revision >> 16) == 0)
 565                 pr_err("Warning: System table version "
 566                        "%d.%02d, expected 1.00 or greater!\n",
 567                        efi.systab->hdr.revision >> 16,
 568                        efi.systab->hdr.revision & 0xffff);
 569
 570         return 0;
 571 }
 572
 573 static int __init efi_runtime_init(void)
 574 {
 575         efi_runtime_services_t *runtime;
 576
 577         /*
 578          * Check out the runtime services table. We need to map
 579          * the runtime services table so that we can grab the physical
 580          * address of several of the EFI runtime functions, needed to
 581          * set the firmware into virtual mode.
 582          */
 583         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 584                                 sizeof(efi_runtime_services_t));
 585         if (!runtime) {
 586                 pr_err("Could not map the runtime service table!\n");
 587                 return -ENOMEM;
 588         }
 589         /*
 590          * We will only need *early* access to the following
 591          * two EFI runtime services before set_virtual_address_map
 592          * is invoked.
 593          */
 594         efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 595         efi_phys.set_virtual_address_map =
 596                 (efi_set_virtual_address_map_t *)
 597                 runtime->set_virtual_address_map;
 598         /*
 599          * Make efi_get_time can be called before entering
 600          * virtual mode.
 601          */
 602         efi.get_time = phys_efi_get_time;
 603         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 604
 605         return 0;
 606 }
 607
 608 static int __init efi_memmap_init(void)
 609 {
 610         /* Map the EFI memory map */
 611         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 612                                    memmap.nr_map * memmap.desc_size);
 613         if (memmap.map == NULL) {
 614                 pr_err("Could not map the memory map!\n");
 615                 return -ENOMEM;
 616         }
 617         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 618
 619         if (add_efi_memmap)
 620                 do_add_efi_memmap();
 621
 622         return 0;
 623 }
 624
 625 void __init efi_init(void)
 626 {
 627         efi_char16_t *c16;
 628         char vendor[100] = "unknown";
 629         int i = 0;
 630         void *tmp;
 631
 632 #ifdef CONFIG_X86_32
 633         if (boot_params.efi_info.efi_systab_hi ||
 634             boot_params.efi_info.efi_memmap_hi) {
 635                 pr_info("Table located above 4GB, disabling EFI.\n");
 636                 return;
 637         }
 638         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 639 #else
 640         efi_phys.systab = (efi_system_table_t *)
 641                           (boot_params.efi_info.efi_systab |
 642                           ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 643 #endif
 644
 645         if (efi_systab_init(efi_phys.systab))
 646                 return;
 647
 648         set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility);
 649
 650         /*
 651          * Show what we know for posterity
 652          */
 653         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 654         if (c16) {
 655                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 656                         vendor[i] = *c16++;
 657                 vendor[i] = '\0';
 658         } else
 659                 pr_err("Could not map the firmware vendor!\n");
 660         early_iounmap(tmp, 2);
 661
 662         pr_info("EFI v%u.%.02u by %s\n",
 663                 efi.systab->hdr.revision >> 16,
 664                 efi.systab->hdr.revision & 0xffff, vendor);
 665
 666         if (efi_config_init(arch_tables))
 667                 return;
 668
 669         set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
 670
 671         /*
 672          * Note: We currently don't support runtime services on an EFI
 673          * that doesn't match the kernel 32/64-bit mode.
 674          */
 675
 676         if (!efi_is_native())
 677                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
 678         else {
 679                 if (disable_runtime || efi_runtime_init())
 680                         return;
 681                 set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
 682         }
 683
 684         if (efi_memmap_init())
 685                 return;
 686
 687         set_bit(EFI_MEMMAP, &x86_efi_facility);
 688
 689 #ifdef CONFIG_X86_32
 690         if (efi_is_native()) {
 691                 x86_platform.get_wallclock = efi_get_time;
 692                 x86_platform.set_wallclock = efi_set_rtc_mmss;
 693         }
 694 #endif
 695
 696 #if EFI_DEBUG
 697         print_efi_memmap();
 698 #endif
 699 }
 700
 701 void __init efi_late_init(void)
 702 {
 703         efi_bgrt_init();
 704 }
 705
 706 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 707 {
 708         u64 addr, npages;
 709
 710         addr = md->virt_addr;
 711         npages = md->num_pages;
 712
 713         memrange_efi_to_native(&addr, &npages);
 714
 715         if (executable)
 716                 set_memory_x(addr, npages);
 717         else
 718                 set_memory_nx(addr, npages);
 719 }
 720
 721 static void __init runtime_code_page_mkexec(void)
 722 {
 723         efi_memory_desc_t *md;
 724         void *p;
 725
 726         /* Make EFI runtime service code area executable */
 727         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 728                 md = p;
 729
 730                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 731                         continue;
 732
 733                 efi_set_executable(md, true);
 734         }
 735 }
 736
 737 /*
 738  * We can't ioremap data in EFI boot services RAM, because we've already mapped
 739  * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
 740  * callable after efi_enter_virtual_mode and before efi_free_boot_services.
 741  */
 742 void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
 743 {
 744         void *p;
 745         if (WARN_ON(!memmap.map))
 746                 return NULL;
 747         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 748                 efi_memory_desc_t *md = p;
 749                 u64 size = md->num_pages << EFI_PAGE_SHIFT;
 750                 u64 end = md->phys_addr + size;
 751                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 752                     md->type != EFI_BOOT_SERVICES_CODE &&
 753                     md->type != EFI_BOOT_SERVICES_DATA)
 754                         continue;
 755                 if (!md->virt_addr)
 756                         continue;
 757                 if (phys_addr >= md->phys_addr && phys_addr < end) {
 758                         phys_addr += md->virt_addr - md->phys_addr;
 759                         return (__force void __iomem *)(unsigned long)phys_addr;
 760                 }
 761         }
 762         return NULL;
 763 }
 764
 765 void efi_memory_uc(u64 addr, unsigned long size)
 766 {
 767         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
 768         u64 npages;
 769
 770         npages = round_up(size, page_shift) / page_shift;
 771         memrange_efi_to_native(&addr, &npages);
 772         set_memory_uc(addr, npages);
 773 }
 774
 775 /*
 776  * This function will switch the EFI runtime services to virtual mode.
 777  * Essentially, look through the EFI memmap and map every region that
 778  * has the runtime attribute bit set in its memory descriptor and update
 779  * that memory descriptor with the virtual address obtained from ioremap().
 780  * This enables the runtime services to be called without having to
 781  * thunk back into physical mode for every invocation.
 782  */
 783 void __init efi_enter_virtual_mode(void)
 784 {
 785         efi_memory_desc_t *md, *prev_md = NULL;
 786         efi_status_t status;
 787         unsigned long size;
 788         u64 end, systab, start_pfn, end_pfn;
 789         void *p, *va, *new_memmap = NULL;
 790         int count = 0;
 791
 792         efi.systab = NULL;
 793
 794         /*
 795          * We don't do virtual mode, since we don't do runtime services, on
 796          * non-native EFI
 797          */
 798
 799         if (!efi_is_native()) {
 800                 efi_unmap_memmap();
 801                 return;
 802         }
 803
 804         /* Merge contiguous regions of the same type and attribute */
 805         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 806                 u64 prev_size;
 807                 md = p;
 808
 809                 if (!prev_md) {
 810                         prev_md = md;
 811                         continue;
 812                 }
 813
 814                 if (prev_md->type != md->type ||
 815                     prev_md->attribute != md->attribute) {
 816                         prev_md = md;
 817                         continue;
 818                 }
 819
 820                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 821
 822                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 823                         prev_md->num_pages += md->num_pages;
 824                         md->type = EFI_RESERVED_TYPE;
 825                         md->attribute = 0;
 826                         continue;
 827                 }
 828                 prev_md = md;
 829         }
 830
 831         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 832                 md = p;
 833                 if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
 834                     md->type != EFI_BOOT_SERVICES_CODE &&
 835                     md->type != EFI_BOOT_SERVICES_DATA)
 836                         continue;
 837
 838                 size = md->num_pages << EFI_PAGE_SHIFT;
 839                 end = md->phys_addr + size;
 840
 841                 start_pfn = PFN_DOWN(md->phys_addr);
 842                 end_pfn = PFN_UP(end);
 843                 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
 844                         va = __va(md->phys_addr);
 845
 846                         if (!(md->attribute & EFI_MEMORY_WB))
 847                                 efi_memory_uc((u64)(unsigned long)va, size);
 848                 } else
 849                         va = efi_ioremap(md->phys_addr, size,
 850                                          md->type, md->attribute);
 851
 852                 md->virt_addr = (u64) (unsigned long) va;
 853
 854                 if (!va) {
 855                         pr_err("ioremap of 0x%llX failed!\n",
 856                                (unsigned long long)md->phys_addr);
 857                         continue;
 858                 }
 859
 860                 systab = (u64) (unsigned long) efi_phys.systab;
 861                 if (md->phys_addr <= systab && systab < end) {
 862                         systab += md->virt_addr - md->phys_addr;
 863                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 864                 }
 865                 new_memmap = krealloc(new_memmap,
 866                                       (count + 1) * memmap.desc_size,
 867                                       GFP_KERNEL);
 868                 memcpy(new_memmap + (count * memmap.desc_size), md,
 869                        memmap.desc_size);
 870                 count++;
 871         }
 872
 873         BUG_ON(!efi.systab);
 874
 875         status = phys_efi_set_virtual_address_map(
 876                 memmap.desc_size * count,
 877                 memmap.desc_size,
 878                 memmap.desc_version,
 879                 (efi_memory_desc_t *)__pa(new_memmap));
 880
 881         if (status != EFI_SUCCESS) {
 882                 pr_alert("Unable to switch EFI into virtual mode "
 883                          "(status=%lx)!\n", status);
 884                 panic("EFI call to SetVirtualAddressMap() failed!");
 885         }
 886
 887         /*
 888          * Now that EFI is in virtual mode, update the function
 889          * pointers in the runtime service table to the new virtual addresses.
 890          *
 891          * Call EFI services through wrapper functions.
 892          */
 893         efi.runtime_version = efi_systab.hdr.revision;
 894         efi.get_time = virt_efi_get_time;
 895         efi.set_time = virt_efi_set_time;
 896         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 897         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 898         efi.get_variable = virt_efi_get_variable;
 899         efi.get_next_variable = virt_efi_get_next_variable;
 900         efi.set_variable = virt_efi_set_variable;
 901         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 902         efi.reset_system = virt_efi_reset_system;
 903         efi.set_virtual_address_map = NULL;
 904         efi.query_variable_info = virt_efi_query_variable_info;
 905         efi.update_capsule = virt_efi_update_capsule;
 906         efi.query_capsule_caps = virt_efi_query_capsule_caps;
 907         if (__supported_pte_mask & _PAGE_NX)
 908                 runtime_code_page_mkexec();
 909
 910         kfree(new_memmap);
 911
 912         /* clean DUMMY object */
 913         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
 914                          EFI_VARIABLE_NON_VOLATILE |
 915                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
 916                          EFI_VARIABLE_RUNTIME_ACCESS,
 917                          0, NULL);
 918 }
 919
 920 /*
 921  * Convenience functions to obtain memory types and attributes
 922  */
 923 u32 efi_mem_type(unsigned long phys_addr)
 924 {
 925         efi_memory_desc_t *md;
 926         void *p;
 927
 928         if (!efi_enabled(EFI_MEMMAP))
 929                 return 0;
 930
 931         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 932                 md = p;
 933                 if ((md->phys_addr <= phys_addr) &&
 934                     (phys_addr < (md->phys_addr +
 935                                   (md->num_pages << EFI_PAGE_SHIFT))))
 936                         return md->type;
 937         }
 938         return 0;
 939 }
 940
 941 u64 efi_mem_attributes(unsigned long phys_addr)
 942 {
 943         efi_memory_desc_t *md;
 944         void *p;
 945
 946         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 947                 md = p;
 948                 if ((md->phys_addr <= phys_addr) &&
 949                     (phys_addr < (md->phys_addr +
 950                                   (md->num_pages << EFI_PAGE_SHIFT))))
 951                         return md->attribute;
 952         }
 953         return 0;
 954 }
 955
 956 /*
 957  * Some firmware has serious problems when using more than 50% of the EFI
 958  * variable store, i.e. it triggers bugs that can brick machines. Ensure that
 959  * we never use more than this safe limit.
 960  *
 961  * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable
 962  * store.
 963  */
 964 efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
 965 {
 966         efi_status_t status;
 967         u64 storage_size, remaining_size, max_size;
 968
 969         if (!(attributes & EFI_VARIABLE_NON_VOLATILE))
 970                 return 0;
 971
 972         status = efi.query_variable_info(attributes, &storage_size,
 973                                          &remaining_size, &max_size);
 974         if (status != EFI_SUCCESS)
 975                 return status;
 976
 977         /*
 978          * Some firmware implementations refuse to boot if there's insufficient
 979          * space in the variable store. We account for that by refusing the
 980          * write if permitting it would reduce the available space to under
 981          * 5KB. This figure was provided by Samsung, so should be safe.
 982          */
 983         if ((remaining_size - size < EFI_MIN_RESERVE) &&
 984                 !efi_no_storage_paranoia) {
 985
 986                 /*
 987                  * Triggering garbage collection may require that the firmware
 988                  * generate a real EFI_OUT_OF_RESOURCES error. We can force
 989                  * that by attempting to use more space than is available.
 990                  */
 991                 unsigned long dummy_size = remaining_size + 1024;
 992                 void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
 993
 994                 if (!dummy)
 995                         return EFI_OUT_OF_RESOURCES;
 996
 997                 status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
 998                                           EFI_VARIABLE_NON_VOLATILE |
 999                                           EFI_VARIABLE_BOOTSERVICE_ACCESS |
1000                                           EFI_VARIABLE_RUNTIME_ACCESS,
1001                                           dummy_size, dummy);
1002
1003                 if (status == EFI_SUCCESS) {
1004                         /*
1005                          * This should have failed, so if it didn't make sure
1006                          * that we delete it...
1007                          */
1008                         efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
1009                                          EFI_VARIABLE_NON_VOLATILE |
1010                                          EFI_VARIABLE_BOOTSERVICE_ACCESS |
1011                                          EFI_VARIABLE_RUNTIME_ACCESS,
1012                                          0, dummy);
1013                 }
1014
1015                 kfree(dummy);
1016
1017                 /*
1018                  * The runtime code may now have triggered a garbage collection
1019                  * run, so check the variable info again
1020                  */
1021                 status = efi.query_variable_info(attributes, &storage_size,
1022                                                  &remaining_size, &max_size);
1023
1024                 if (status != EFI_SUCCESS)
1025                         return status;
1026
1027                 /*
1028                  * There still isn't enough room, so return an error
1029                  */
1030                 if (remaining_size - size < EFI_MIN_RESERVE)
1031                         return EFI_OUT_OF_RESOURCES;
1032         }
1033
1034         return EFI_SUCCESS;
1035 }
1036 EXPORT_SYMBOL_GPL(efi_query_variable_store);