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/memblock.h>
  34 #include <linux/spinlock.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/time.h>
  37 #include <linux/io.h>
  38 #include <linux/reboot.h>
  39 #include <linux/bcd.h>
  40
  41 #include <asm/setup.h>
  42 #include <asm/efi.h>
  43 #include <asm/time.h>
  44 #include <asm/cacheflush.h>
  45 #include <asm/tlbflush.h>
  46 #include <asm/x86_init.h>
  47
  48 #define EFI_DEBUG       1
  49 #define PFX             "EFI: "
  50
  51 int efi_enabled;
  52 EXPORT_SYMBOL(efi_enabled);
  53
  54 struct efi efi;
  55 EXPORT_SYMBOL(efi);
  56
  57 struct efi_memory_map memmap;
  58
  59 static struct efi efi_phys __initdata;
  60 static efi_system_table_t efi_systab __initdata;
  61
  62 static int __init setup_noefi(char *arg)
  63 {
  64         efi_enabled = 0;
  65         return 0;
  66 }
  67 early_param("noefi", setup_noefi);
  68
  69 int add_efi_memmap;
  70 EXPORT_SYMBOL(add_efi_memmap);
  71
  72 static int __init setup_add_efi_memmap(char *arg)
  73 {
  74         add_efi_memmap = 1;
  75         return 0;
  76 }
  77 early_param("add_efi_memmap", setup_add_efi_memmap);
  78
  79
  80 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  81 {
  82         return efi_call_virt2(get_time, tm, tc);
  83 }
  84
  85 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  86 {
  87         return efi_call_virt1(set_time, tm);
  88 }
  89
  90 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  91                                              efi_bool_t *pending,
  92                                              efi_time_t *tm)
  93 {
  94         return efi_call_virt3(get_wakeup_time,
  95                               enabled, pending, tm);
  96 }
  97
  98 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  99 {
 100         return efi_call_virt2(set_wakeup_time,
 101                               enabled, tm);
 102 }
 103
 104 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
 105                                           efi_guid_t *vendor,
 106                                           u32 *attr,
 107                                           unsigned long *data_size,
 108                                           void *data)
 109 {
 110         return efi_call_virt5(get_variable,
 111                               name, vendor, attr,
 112                               data_size, data);
 113 }
 114
 115 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 116                                                efi_char16_t *name,
 117                                                efi_guid_t *vendor)
 118 {
 119         return efi_call_virt3(get_next_variable,
 120                               name_size, name, vendor);
 121 }
 122
 123 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 124                                           efi_guid_t *vendor,
 125                                           unsigned long attr,
 126                                           unsigned long data_size,
 127                                           void *data)
 128 {
 129         return efi_call_virt5(set_variable,
 130                               name, vendor, attr,
 131                               data_size, data);
 132 }
 133
 134 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 135 {
 136         return efi_call_virt1(get_next_high_mono_count, count);
 137 }
 138
 139 static void virt_efi_reset_system(int reset_type,
 140                                   efi_status_t status,
 141                                   unsigned long data_size,
 142                                   efi_char16_t *data)
 143 {
 144         efi_call_virt4(reset_system, reset_type, status,
 145                        data_size, data);
 146 }
 147
 148 static efi_status_t virt_efi_set_virtual_address_map(
 149         unsigned long memory_map_size,
 150         unsigned long descriptor_size,
 151         u32 descriptor_version,
 152         efi_memory_desc_t *virtual_map)
 153 {
 154         return efi_call_virt4(set_virtual_address_map,
 155                               memory_map_size, descriptor_size,
 156                               descriptor_version, virtual_map);
 157 }
 158
 159 static efi_status_t __init phys_efi_set_virtual_address_map(
 160         unsigned long memory_map_size,
 161         unsigned long descriptor_size,
 162         u32 descriptor_version,
 163         efi_memory_desc_t *virtual_map)
 164 {
 165         efi_status_t status;
 166
 167         efi_call_phys_prelog();
 168         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 169                                 memory_map_size, descriptor_size,
 170                                 descriptor_version, virtual_map);
 171         efi_call_phys_epilog();
 172         return status;
 173 }
 174
 175 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 176                                              efi_time_cap_t *tc)
 177 {
 178         efi_status_t status;
 179
 180         efi_call_phys_prelog();
 181         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 182         efi_call_phys_epilog();
 183         return status;
 184 }
 185
 186 int efi_set_rtc_mmss(unsigned long nowtime)
 187 {
 188         int real_seconds, real_minutes;
 189         efi_status_t    status;
 190         efi_time_t      eft;
 191         efi_time_cap_t  cap;
 192
 193         status = efi.get_time(&eft, &cap);
 194         if (status != EFI_SUCCESS) {
 195                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 196                 return -1;
 197         }
 198
 199         real_seconds = nowtime % 60;
 200         real_minutes = nowtime / 60;
 201         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 202                 real_minutes += 30;
 203         real_minutes %= 60;
 204         eft.minute = real_minutes;
 205         eft.second = real_seconds;
 206
 207         status = efi.set_time(&eft);
 208         if (status != EFI_SUCCESS) {
 209                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 210                 return -1;
 211         }
 212         return 0;
 213 }
 214
 215 unsigned long efi_get_time(void)
 216 {
 217         efi_status_t status;
 218         efi_time_t eft;
 219         efi_time_cap_t cap;
 220
 221         status = efi.get_time(&eft, &cap);
 222         if (status != EFI_SUCCESS)
 223                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 224
 225         return mktime(eft.year, eft.month, eft.day, eft.hour,
 226                       eft.minute, eft.second);
 227 }
 228
 229 /*
 230  * Tell the kernel about the EFI memory map.  This might include
 231  * more than the max 128 entries that can fit in the e820 legacy
 232  * (zeropage) memory map.
 233  */
 234
 235 static void __init do_add_efi_memmap(void)
 236 {
 237         void *p;
 238
 239         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 240                 efi_memory_desc_t *md = p;
 241                 unsigned long long start = md->phys_addr;
 242                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 243                 int e820_type;
 244
 245                 switch (md->type) {
 246                 case EFI_LOADER_CODE:
 247                 case EFI_LOADER_DATA:
 248                 case EFI_BOOT_SERVICES_CODE:
 249                 case EFI_BOOT_SERVICES_DATA:
 250                 case EFI_CONVENTIONAL_MEMORY:
 251                         if (md->attribute & EFI_MEMORY_WB)
 252                                 e820_type = E820_RAM;
 253                         else
 254                                 e820_type = E820_RESERVED;
 255                         break;
 256                 case EFI_ACPI_RECLAIM_MEMORY:
 257                         e820_type = E820_ACPI;
 258                         break;
 259                 case EFI_ACPI_MEMORY_NVS:
 260                         e820_type = E820_NVS;
 261                         break;
 262                 case EFI_UNUSABLE_MEMORY:
 263                         e820_type = E820_UNUSABLE;
 264                         break;
 265                 default:
 266                         /*
 267                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 268                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 269                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 270                          */
 271                         e820_type = E820_RESERVED;
 272                         break;
 273                 }
 274                 e820_add_region(start, size, e820_type);
 275         }
 276         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 277 }
 278
 279 void __init efi_memblock_x86_reserve_range(void)
 280 {
 281         unsigned long pmap;
 282
 283 #ifdef CONFIG_X86_32
 284         pmap = boot_params.efi_info.efi_memmap;
 285 #else
 286         pmap = (boot_params.efi_info.efi_memmap |
 287                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 288 #endif
 289         memmap.phys_map = (void *)pmap;
 290         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 291                 boot_params.efi_info.efi_memdesc_size;
 292         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 293         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 294         memblock_x86_reserve_range(pmap, pmap + memmap.nr_map * memmap.desc_size,
 295                       "EFI memmap");
 296 }
 297
 298 #if EFI_DEBUG
 299 static void __init print_efi_memmap(void)
 300 {
 301         efi_memory_desc_t *md;
 302         void *p;
 303         int i;
 304
 305         for (p = memmap.map, i = 0;
 306              p < memmap.map_end;
 307              p += memmap.desc_size, i++) {
 308                 md = p;
 309                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 310                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 311                         i, md->type, md->attribute, md->phys_addr,
 312                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 313                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 314         }
 315 }
 316 #endif  /*  EFI_DEBUG  */
 317
 318 void __init efi_init(void)
 319 {
 320         efi_config_table_t *config_tables;
 321         efi_runtime_services_t *runtime;
 322         efi_char16_t *c16;
 323         char vendor[100] = "unknown";
 324         int i = 0;
 325         void *tmp;
 326
 327 #ifdef CONFIG_X86_32
 328         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 329 #else
 330         efi_phys.systab = (efi_system_table_t *)
 331                 (boot_params.efi_info.efi_systab |
 332                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 333 #endif
 334
 335         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 336                                    sizeof(efi_system_table_t));
 337         if (efi.systab == NULL)
 338                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 339         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 340         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 341         efi.systab = &efi_systab;
 342
 343         /*
 344          * Verify the EFI Table
 345          */
 346         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 347                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 348         if ((efi.systab->hdr.revision >> 16) == 0)
 349                 printk(KERN_ERR "Warning: EFI system table version "
 350                        "%d.%02d, expected 1.00 or greater!\n",
 351                        efi.systab->hdr.revision >> 16,
 352                        efi.systab->hdr.revision & 0xffff);
 353
 354         /*
 355          * Show what we know for posterity
 356          */
 357         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 358         if (c16) {
 359                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 360                         vendor[i] = *c16++;
 361                 vendor[i] = '\0';
 362         } else
 363                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 364         early_iounmap(tmp, 2);
 365
 366         printk(KERN_INFO "EFI v%u.%.02u by %s\n",
 367                efi.systab->hdr.revision >> 16,
 368                efi.systab->hdr.revision & 0xffff, vendor);
 369
 370         /*
 371          * Let's see what config tables the firmware passed to us.
 372          */
 373         config_tables = early_ioremap(
 374                 efi.systab->tables,
 375                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 376         if (config_tables == NULL)
 377                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 378
 379         printk(KERN_INFO);
 380         for (i = 0; i < efi.systab->nr_tables; i++) {
 381                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 382                         efi.mps = config_tables[i].table;
 383                         printk(" MPS=0x%lx ", config_tables[i].table);
 384                 } else if (!efi_guidcmp(config_tables[i].guid,
 385                                         ACPI_20_TABLE_GUID)) {
 386                         efi.acpi20 = config_tables[i].table;
 387                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 388                 } else if (!efi_guidcmp(config_tables[i].guid,
 389                                         ACPI_TABLE_GUID)) {
 390                         efi.acpi = config_tables[i].table;
 391                         printk(" ACPI=0x%lx ", config_tables[i].table);
 392                 } else if (!efi_guidcmp(config_tables[i].guid,
 393                                         SMBIOS_TABLE_GUID)) {
 394                         efi.smbios = config_tables[i].table;
 395                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 396 #ifdef CONFIG_X86_UV
 397                 } else if (!efi_guidcmp(config_tables[i].guid,
 398                                         UV_SYSTEM_TABLE_GUID)) {
 399                         efi.uv_systab = config_tables[i].table;
 400                         printk(" UVsystab=0x%lx ", config_tables[i].table);
 401 #endif
 402                 } else if (!efi_guidcmp(config_tables[i].guid,
 403                                         HCDP_TABLE_GUID)) {
 404                         efi.hcdp = config_tables[i].table;
 405                         printk(" HCDP=0x%lx ", config_tables[i].table);
 406                 } else if (!efi_guidcmp(config_tables[i].guid,
 407                                         UGA_IO_PROTOCOL_GUID)) {
 408                         efi.uga = config_tables[i].table;
 409                         printk(" UGA=0x%lx ", config_tables[i].table);
 410                 }
 411         }
 412         printk("\n");
 413         early_iounmap(config_tables,
 414                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 415
 416         /*
 417          * Check out the runtime services table. We need to map
 418          * the runtime services table so that we can grab the physical
 419          * address of several of the EFI runtime functions, needed to
 420          * set the firmware into virtual mode.
 421          */
 422         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 423                                 sizeof(efi_runtime_services_t));
 424         if (runtime != NULL) {
 425                 /*
 426                  * We will only need *early* access to the following
 427                  * two EFI runtime services before set_virtual_address_map
 428                  * is invoked.
 429                  */
 430                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 431                 efi_phys.set_virtual_address_map =
 432                         (efi_set_virtual_address_map_t *)
 433                         runtime->set_virtual_address_map;
 434                 /*
 435                  * Make efi_get_time can be called before entering
 436                  * virtual mode.
 437                  */
 438                 efi.get_time = phys_efi_get_time;
 439         } else
 440                 printk(KERN_ERR "Could not map the EFI runtime service "
 441                        "table!\n");
 442         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 443
 444         /* Map the EFI memory map */
 445         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 446                                    memmap.nr_map * memmap.desc_size);
 447         if (memmap.map == NULL)
 448                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 449         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 450
 451         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 452                 printk(KERN_WARNING
 453                   "Kernel-defined memdesc doesn't match the one from EFI!\n");
 454
 455         if (add_efi_memmap)
 456                 do_add_efi_memmap();
 457
 458 #ifdef CONFIG_X86_32
 459         x86_platform.get_wallclock = efi_get_time;
 460         x86_platform.set_wallclock = efi_set_rtc_mmss;
 461 #endif
 462
 463         /* Setup for EFI runtime service */
 464         reboot_type = BOOT_EFI;
 465
 466 #if EFI_DEBUG
 467         print_efi_memmap();
 468 #endif
 469 }
 470
 471 static void __init runtime_code_page_mkexec(void)
 472 {
 473         efi_memory_desc_t *md;
 474         void *p;
 475         u64 addr, npages;
 476
 477         /* Make EFI runtime service code area executable */
 478         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 479                 md = p;
 480
 481                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 482                         continue;
 483
 484                 addr = md->virt_addr;
 485                 npages = md->num_pages;
 486                 memrange_efi_to_native(&addr, &npages);
 487                 set_memory_x(addr, npages);
 488         }
 489 }
 490
 491 /*
 492  * This function will switch the EFI runtime services to virtual mode.
 493  * Essentially, look through the EFI memmap and map every region that
 494  * has the runtime attribute bit set in its memory descriptor and update
 495  * that memory descriptor with the virtual address obtained from ioremap().
 496  * This enables the runtime services to be called without having to
 497  * thunk back into physical mode for every invocation.
 498  */
 499 void __init efi_enter_virtual_mode(void)
 500 {
 501         efi_memory_desc_t *md;
 502         efi_status_t status;
 503         unsigned long size;
 504         u64 end, systab, addr, npages, end_pfn;
 505         void *p, *va;
 506
 507         efi.systab = NULL;
 508         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 509                 md = p;
 510                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 511                         continue;
 512
 513                 size = md->num_pages << EFI_PAGE_SHIFT;
 514                 end = md->phys_addr + size;
 515
 516                 end_pfn = PFN_UP(end);
 517                 if (end_pfn <= max_low_pfn_mapped
 518                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 519                         && end_pfn <= max_pfn_mapped))
 520                         va = __va(md->phys_addr);
 521                 else
 522                         va = efi_ioremap(md->phys_addr, size, md->type);
 523
 524                 md->virt_addr = (u64) (unsigned long) va;
 525
 526                 if (!va) {
 527                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 528                                (unsigned long long)md->phys_addr);
 529                         continue;
 530                 }
 531
 532                 if (!(md->attribute & EFI_MEMORY_WB)) {
 533                         addr = md->virt_addr;
 534                         npages = md->num_pages;
 535                         memrange_efi_to_native(&addr, &npages);
 536                         set_memory_uc(addr, npages);
 537                 }
 538
 539                 systab = (u64) (unsigned long) efi_phys.systab;
 540                 if (md->phys_addr <= systab && systab < end) {
 541                         systab += md->virt_addr - md->phys_addr;
 542                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 543                 }
 544         }
 545
 546         BUG_ON(!efi.systab);
 547
 548         status = phys_efi_set_virtual_address_map(
 549                 memmap.desc_size * memmap.nr_map,
 550                 memmap.desc_size,
 551                 memmap.desc_version,
 552                 memmap.phys_map);
 553
 554         if (status != EFI_SUCCESS) {
 555                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 556                        "(status=%lx)!\n", status);
 557                 panic("EFI call to SetVirtualAddressMap() failed!");
 558         }
 559
 560         /*
 561          * Now that EFI is in virtual mode, update the function
 562          * pointers in the runtime service table to the new virtual addresses.
 563          *
 564          * Call EFI services through wrapper functions.
 565          */
 566         efi.get_time = virt_efi_get_time;
 567         efi.set_time = virt_efi_set_time;
 568         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 569         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 570         efi.get_variable = virt_efi_get_variable;
 571         efi.get_next_variable = virt_efi_get_next_variable;
 572         efi.set_variable = virt_efi_set_variable;
 573         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 574         efi.reset_system = virt_efi_reset_system;
 575         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 576         if (__supported_pte_mask & _PAGE_NX)
 577                 runtime_code_page_mkexec();
 578         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 579         memmap.map = NULL;
 580 }
 581
 582 /*
 583  * Convenience functions to obtain memory types and attributes
 584  */
 585 u32 efi_mem_type(unsigned long phys_addr)
 586 {
 587         efi_memory_desc_t *md;
 588         void *p;
 589
 590         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 591                 md = p;
 592                 if ((md->phys_addr <= phys_addr) &&
 593                     (phys_addr < (md->phys_addr +
 594                                   (md->num_pages << EFI_PAGE_SHIFT))))
 595                         return md->type;
 596         }
 597         return 0;
 598 }
 599
 600 u64 efi_mem_attributes(unsigned long phys_addr)
 601 {
 602         efi_memory_desc_t *md;
 603         void *p;
 604
 605         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 606                 md = p;
 607                 if ((md->phys_addr <= phys_addr) &&
 608                     (phys_addr < (md->phys_addr +
 609                                   (md->num_pages << EFI_PAGE_SHIFT))))
 610                         return md->attribute;
 611         }
 612         return 0;
 613 }