arch/x86/kernel/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 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <linux/efi.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/time.h>
  36 #include <linux/io.h>
  37 #include <linux/reboot.h>
  38 #include <linux/bcd.h>
  39
  40 #include <asm/setup.h>
  41 #include <asm/efi.h>
  42 #include <asm/time.h>
  43 #include <asm/cacheflush.h>
  44 #include <asm/tlbflush.h>
  45 #include <asm/x86_init.h>
  46
  47 #define EFI_DEBUG       1
  48 #define PFX             "EFI: "
  49
  50 int efi_enabled;
  51 EXPORT_SYMBOL(efi_enabled);
  52
  53 struct efi efi;
  54 EXPORT_SYMBOL(efi);
  55
  56 struct efi_memory_map memmap;
  57
  58 static struct efi efi_phys __initdata;
  59 static efi_system_table_t efi_systab __initdata;
  60
  61 static int __init setup_noefi(char *arg)
  62 {
  63         efi_enabled = 0;
  64         return 0;
  65 }
  66 early_param("noefi", setup_noefi);
  67
  68 int add_efi_memmap;
  69 EXPORT_SYMBOL(add_efi_memmap);
  70
  71 static int __init setup_add_efi_memmap(char *arg)
  72 {
  73         add_efi_memmap = 1;
  74         return 0;
  75 }
  76 early_param("add_efi_memmap", setup_add_efi_memmap);
  77
  78
  79 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  80 {
  81         return efi_call_virt2(get_time, tm, tc);
  82 }
  83
  84 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  85 {
  86         return efi_call_virt1(set_time, tm);
  87 }
  88
  89 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  90                                              efi_bool_t *pending,
  91                                              efi_time_t *tm)
  92 {
  93         return efi_call_virt3(get_wakeup_time,
  94                               enabled, pending, tm);
  95 }
  96
  97 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  98 {
  99         return efi_call_virt2(set_wakeup_time,
 100                               enabled, tm);
 101 }
 102
 103 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 104                                           efi_guid_t *vendor,
 105                                           u32 *attr,
 106                                           unsigned long *data_size,
 107                                           void *data)
 108 {
 109         return efi_call_virt5(get_variable,
 110                               name, vendor, attr,
 111                               data_size, data);
 112 }
 113
 114 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 115                                                efi_char16_t *name,
 116                                                efi_guid_t *vendor)
 117 {
 118         return efi_call_virt3(get_next_variable,
 119                               name_size, name, vendor);
 120 }
 121
 122 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 123                                           efi_guid_t *vendor,
 124                                           unsigned long attr,
 125                                           unsigned long data_size,
 126                                           void *data)
 127 {
 128         return efi_call_virt5(set_variable,
 129                               name, vendor, attr,
 130                               data_size, data);
 131 }
 132
 133 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 134 {
 135         return efi_call_virt1(get_next_high_mono_count, count);
 136 }
 137
 138 static void virt_efi_reset_system(int reset_type,
 139                                   efi_status_t status,
 140                                   unsigned long data_size,
 141                                   efi_char16_t *data)
 142 {
 143         efi_call_virt4(reset_system, reset_type, status,
 144                        data_size, data);
 145 }
 146
 147 static efi_status_t virt_efi_set_virtual_address_map(
 148         unsigned long memory_map_size,
 149         unsigned long descriptor_size,
 150         u32 descriptor_version,
 151         efi_memory_desc_t *virtual_map)
 152 {
 153         return efi_call_virt4(set_virtual_address_map,
 154                               memory_map_size, descriptor_size,
 155                               descriptor_version, virtual_map);
 156 }
 157
 158 static efi_status_t __init phys_efi_set_virtual_address_map(
 159         unsigned long memory_map_size,
 160         unsigned long descriptor_size,
 161         u32 descriptor_version,
 162         efi_memory_desc_t *virtual_map)
 163 {
 164         efi_status_t status;
 165
 166         efi_call_phys_prelog();
 167         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 168                                 memory_map_size, descriptor_size,
 169                                 descriptor_version, virtual_map);
 170         efi_call_phys_epilog();
 171         return status;
 172 }
 173
 174 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 175                                              efi_time_cap_t *tc)
 176 {
 177         efi_status_t status;
 178
 179         efi_call_phys_prelog();
 180         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 181         efi_call_phys_epilog();
 182         return status;
 183 }
 184
 185 int efi_set_rtc_mmss(unsigned long nowtime)
 186 {
 187         int real_seconds, real_minutes;
 188         efi_status_t    status;
 189         efi_time_t      eft;
 190         efi_time_cap_t  cap;
 191
 192         status = efi.get_time(&eft, &cap);
 193         if (status != EFI_SUCCESS) {
 194                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 195                 return -1;
 196         }
 197
 198         real_seconds = nowtime % 60;
 199         real_minutes = nowtime / 60;
 200         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 201                 real_minutes += 30;
 202         real_minutes %= 60;
 203         eft.minute = real_minutes;
 204         eft.second = real_seconds;
 205
 206         status = efi.set_time(&eft);
 207         if (status != EFI_SUCCESS) {
 208                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 209                 return -1;
 210         }
 211         return 0;
 212 }
 213
 214 unsigned long efi_get_time(void)
 215 {
 216         efi_status_t status;
 217         efi_time_t eft;
 218         efi_time_cap_t cap;
 219
 220         status = efi.get_time(&eft, &cap);
 221         if (status != EFI_SUCCESS)
 222                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 223
 224         return mktime(eft.year, eft.month, eft.day, eft.hour,
 225                       eft.minute, eft.second);
 226 }
 227
 228 /*
 229  * Tell the kernel about the EFI memory map.  This might include
 230  * more than the max 128 entries that can fit in the e820 legacy
 231  * (zeropage) memory map.
 232  */
 233
 234 static void __init do_add_efi_memmap(void)
 235 {
 236         void *p;
 237
 238         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 239                 efi_memory_desc_t *md = p;
 240                 unsigned long long start = md->phys_addr;
 241                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 242                 int e820_type;
 243
 244                 switch (md->type) {
 245                 case EFI_LOADER_CODE:
 246                 case EFI_LOADER_DATA:
 247                 case EFI_BOOT_SERVICES_CODE:
 248                 case EFI_BOOT_SERVICES_DATA:
 249                 case EFI_CONVENTIONAL_MEMORY:
 250                         if (md->attribute & EFI_MEMORY_WB)
 251                                 e820_type = E820_RAM;
 252                         else
 253                                 e820_type = E820_RESERVED;
 254                         break;
 255                 case EFI_ACPI_RECLAIM_MEMORY:
 256                         e820_type = E820_ACPI;
 257                         break;
 258                 case EFI_ACPI_MEMORY_NVS:
 259                         e820_type = E820_NVS;
 260                         break;
 261                 case EFI_UNUSABLE_MEMORY:
 262                         e820_type = E820_UNUSABLE;
 263                         break;
 264                 default:
 265                         /*
 266                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 267                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 268                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 269                          */
 270                         e820_type = E820_RESERVED;
 271                         break;
 272                 }
 273                 e820_add_region(start, size, e820_type);
 274         }
 275         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 276 }
 277
 278 void __init efi_reserve_early(void)
 279 {
 280         unsigned long pmap;
 281
 282 #ifdef CONFIG_X86_32
 283         pmap = boot_params.efi_info.efi_memmap;
 284 #else
 285         pmap = (boot_params.efi_info.efi_memmap |
 286                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 287 #endif
 288         memmap.phys_map = (void *)pmap;
 289         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 290                 boot_params.efi_info.efi_memdesc_size;
 291         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 292         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 293         reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
 294                       "EFI memmap");
 295 }
 296
 297 #if EFI_DEBUG
 298 static void __init print_efi_memmap(void)
 299 {
 300         efi_memory_desc_t *md;
 301         void *p;
 302         int i;
 303
 304         for (p = memmap.map, i = 0;
 305              p < memmap.map_end;
 306              p += memmap.desc_size, i++) {
 307                 md = p;
 308                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 309                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 310                         i, md->type, md->attribute, md->phys_addr,
 311                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 312                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 313         }
 314 }
 315 #endif  /*  EFI_DEBUG  */
 316
 317 void __init efi_init(void)
 318 {
 319         efi_config_table_t *config_tables;
 320         efi_runtime_services_t *runtime;
 321         efi_char16_t *c16;
 322         char vendor[100] = "unknown";
 323         int i = 0;
 324         void *tmp;
 325
 326 #ifdef CONFIG_X86_32
 327         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 328 #else
 329         efi_phys.systab = (efi_system_table_t *)
 330                 (boot_params.efi_info.efi_systab |
 331                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 332 #endif
 333
 334         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 335                                    sizeof(efi_system_table_t));
 336         if (efi.systab == NULL)
 337                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 338         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 339         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 340         efi.systab = &efi_systab;
 341
 342         /*
 343          * Verify the EFI Table
 344          */
 345         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 346                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 347         if ((efi.systab->hdr.revision >> 16) == 0)
 348                 printk(KERN_ERR "Warning: EFI system table version "
 349                        "%d.%02d, expected 1.00 or greater!\n",
 350                        efi.systab->hdr.revision >> 16,
 351                        efi.systab->hdr.revision & 0xffff);
 352
 353         /*
 354          * Show what we know for posterity
 355          */
 356         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 357         if (c16) {
 358                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 359                         vendor[i] = *c16++;
 360                 vendor[i] = '\0';
 361         } else
 362                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 363         early_iounmap(tmp, 2);
 364
 365         printk(KERN_INFO "EFI v%u.%.02u by %s\n",
 366                efi.systab->hdr.revision >> 16,
 367                efi.systab->hdr.revision & 0xffff, vendor);
 368
 369         /*
 370          * Let's see what config tables the firmware passed to us.
 371          */
 372         config_tables = early_ioremap(
 373                 efi.systab->tables,
 374                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 375         if (config_tables == NULL)
 376                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 377
 378         printk(KERN_INFO);
 379         for (i = 0; i < efi.systab->nr_tables; i++) {
 380                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 381                         efi.mps = config_tables[i].table;
 382                         printk(" MPS=0x%lx ", config_tables[i].table);
 383                 } else if (!efi_guidcmp(config_tables[i].guid,
 384                                         ACPI_20_TABLE_GUID)) {
 385                         efi.acpi20 = config_tables[i].table;
 386                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 387                 } else if (!efi_guidcmp(config_tables[i].guid,
 388                                         ACPI_TABLE_GUID)) {
 389                         efi.acpi = config_tables[i].table;
 390                         printk(" ACPI=0x%lx ", config_tables[i].table);
 391                 } else if (!efi_guidcmp(config_tables[i].guid,
 392                                         SMBIOS_TABLE_GUID)) {
 393                         efi.smbios = config_tables[i].table;
 394                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 395 #ifdef CONFIG_X86_UV
 396                 } else if (!efi_guidcmp(config_tables[i].guid,
 397                                         UV_SYSTEM_TABLE_GUID)) {
 398                         efi.uv_systab = config_tables[i].table;
 399                         printk(" UVsystab=0x%lx ", config_tables[i].table);
 400 #endif
 401                 } else if (!efi_guidcmp(config_tables[i].guid,
 402                                         HCDP_TABLE_GUID)) {
 403                         efi.hcdp = config_tables[i].table;
 404                         printk(" HCDP=0x%lx ", config_tables[i].table);
 405                 } else if (!efi_guidcmp(config_tables[i].guid,
 406                                         UGA_IO_PROTOCOL_GUID)) {
 407                         efi.uga = config_tables[i].table;
 408                         printk(" UGA=0x%lx ", config_tables[i].table);
 409                 }
 410         }
 411         printk("\n");
 412         early_iounmap(config_tables,
 413                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 414
 415         /*
 416          * Check out the runtime services table. We need to map
 417          * the runtime services table so that we can grab the physical
 418          * address of several of the EFI runtime functions, needed to
 419          * set the firmware into virtual mode.
 420          */
 421         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 422                                 sizeof(efi_runtime_services_t));
 423         if (runtime != NULL) {
 424                 /*
 425                  * We will only need *early* access to the following
 426                  * two EFI runtime services before set_virtual_address_map
 427                  * is invoked.
 428                  */
 429                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 430                 efi_phys.set_virtual_address_map =
 431                         (efi_set_virtual_address_map_t *)
 432                         runtime->set_virtual_address_map;
 433                 /*
 434                  * Make efi_get_time can be called before entering
 435                  * virtual mode.
 436                  */
 437                 efi.get_time = phys_efi_get_time;
 438         } else
 439                 printk(KERN_ERR "Could not map the EFI runtime service "
 440                        "table!\n");
 441         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 442
 443         /* Map the EFI memory map */
 444         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 445                                    memmap.nr_map * memmap.desc_size);
 446         if (memmap.map == NULL)
 447                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 448         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 449
 450         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 451                 printk(KERN_WARNING
 452                   "Kernel-defined memdesc doesn't match the one from EFI!\n");
 453
 454         if (add_efi_memmap)
 455                 do_add_efi_memmap();
 456
 457 #ifdef CONFIG_X86_32
 458         x86_platform.get_wallclock = efi_get_time;
 459         x86_platform.set_wallclock = efi_set_rtc_mmss;
 460 #endif
 461
 462         /* Setup for EFI runtime service */
 463         reboot_type = BOOT_EFI;
 464
 465 #if EFI_DEBUG
 466         print_efi_memmap();
 467 #endif
 468 }
 469
 470 static void __init runtime_code_page_mkexec(void)
 471 {
 472         efi_memory_desc_t *md;
 473         void *p;
 474         u64 addr, npages;
 475
 476         /* Make EFI runtime service code area executable */
 477         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 478                 md = p;
 479
 480                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 481                         continue;
 482
 483                 addr = md->virt_addr;
 484                 npages = md->num_pages;
 485                 memrange_efi_to_native(&addr, &npages);
 486                 set_memory_x(addr, npages);
 487         }
 488 }
 489
 490 /*
 491  * This function will switch the EFI runtime services to virtual mode.
 492  * Essentially, look through the EFI memmap and map every region that
 493  * has the runtime attribute bit set in its memory descriptor and update
 494  * that memory descriptor with the virtual address obtained from ioremap().
 495  * This enables the runtime services to be called without having to
 496  * thunk back into physical mode for every invocation.
 497  */
 498 void __init efi_enter_virtual_mode(void)
 499 {
 500         efi_memory_desc_t *md;
 501         efi_status_t status;
 502         unsigned long size;
 503         u64 end, systab, addr, npages, end_pfn;
 504         void *p, *va;
 505
 506         efi.systab = NULL;
 507         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 508                 md = p;
 509                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 510                         continue;
 511
 512                 size = md->num_pages << EFI_PAGE_SHIFT;
 513                 end = md->phys_addr + size;
 514
 515                 end_pfn = PFN_UP(end);
 516                 if (end_pfn <= max_low_pfn_mapped
 517                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 518                         && end_pfn <= max_pfn_mapped))
 519                         va = __va(md->phys_addr);
 520                 else
 521                         va = efi_ioremap(md->phys_addr, size, md->type);
 522
 523                 md->virt_addr = (u64) (unsigned long) va;
 524
 525                 if (!va) {
 526                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 527                                (unsigned long long)md->phys_addr);
 528                         continue;
 529                 }
 530
 531                 if (!(md->attribute & EFI_MEMORY_WB)) {
 532                         addr = md->virt_addr;
 533                         npages = md->num_pages;
 534                         memrange_efi_to_native(&addr, &npages);
 535                         set_memory_uc(addr, npages);
 536                 }
 537
 538                 systab = (u64) (unsigned long) efi_phys.systab;
 539                 if (md->phys_addr <= systab && systab < end) {
 540                         systab += md->virt_addr - md->phys_addr;
 541                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 542                 }
 543         }
 544
 545         BUG_ON(!efi.systab);
 546
 547         status = phys_efi_set_virtual_address_map(
 548                 memmap.desc_size * memmap.nr_map,
 549                 memmap.desc_size,
 550                 memmap.desc_version,
 551                 memmap.phys_map);
 552
 553         if (status != EFI_SUCCESS) {
 554                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 555                        "(status=%lx)!\n", status);
 556                 panic("EFI call to SetVirtualAddressMap() failed!");
 557         }
 558
 559         /*
 560          * Now that EFI is in virtual mode, update the function
 561          * pointers in the runtime service table to the new virtual addresses.
 562          *
 563          * Call EFI services through wrapper functions.
 564          */
 565         efi.get_time = virt_efi_get_time;
 566         efi.set_time = virt_efi_set_time;
 567         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 568         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 569         efi.get_variable = virt_efi_get_variable;
 570         efi.get_next_variable = virt_efi_get_next_variable;
 571         efi.set_variable = virt_efi_set_variable;
 572         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 573         efi.reset_system = virt_efi_reset_system;
 574         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 575         if (__supported_pte_mask & _PAGE_NX)
 576                 runtime_code_page_mkexec();
 577         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 578         memmap.map = NULL;
 579 }
 580
 581 /*
 582  * Convenience functions to obtain memory types and attributes
 583  */
 584 u32 efi_mem_type(unsigned long phys_addr)
 585 {
 586         efi_memory_desc_t *md;
 587         void *p;
 588
 589         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 590                 md = p;
 591                 if ((md->phys_addr <= phys_addr) &&
 592                     (phys_addr < (md->phys_addr +
 593                                   (md->num_pages << EFI_PAGE_SHIFT))))
 594                         return md->type;
 595         }
 596         return 0;
 597 }
 598
 599 u64 efi_mem_attributes(unsigned long phys_addr)
 600 {
 601         efi_memory_desc_t *md;
 602         void *p;
 603
 604         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 605                 md = p;
 606                 if ((md->phys_addr <= phys_addr) &&
 607                     (phys_addr < (md->phys_addr +
 608                                   (md->num_pages << EFI_PAGE_SHIFT))))
 609                         return md->attribute;
 610         }
 611         return 0;
 612 }