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