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 #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 __init phys_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         efi_status_t status;
 155
 156         efi_call_phys_prelog();
 157         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 158                                 memory_map_size, descriptor_size,
 159                                 descriptor_version, virtual_map);
 160         efi_call_phys_epilog();
 161         return status;
 162 }
 163
 164 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 165                                              efi_time_cap_t *tc)
 166 {
 167         efi_status_t status;
 168
 169         efi_call_phys_prelog();
 170         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 171         efi_call_phys_epilog();
 172         return status;
 173 }
 174
 175 int efi_set_rtc_mmss(unsigned long nowtime)
 176 {
 177         int real_seconds, real_minutes;
 178         efi_status_t    status;
 179         efi_time_t      eft;
 180         efi_time_cap_t  cap;
 181
 182         status = efi.get_time(&eft, &cap);
 183         if (status != EFI_SUCCESS) {
 184                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 185                 return -1;
 186         }
 187
 188         real_seconds = nowtime % 60;
 189         real_minutes = nowtime / 60;
 190         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 191                 real_minutes += 30;
 192         real_minutes %= 60;
 193         eft.minute = real_minutes;
 194         eft.second = real_seconds;
 195
 196         status = efi.set_time(&eft);
 197         if (status != EFI_SUCCESS) {
 198                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 199                 return -1;
 200         }
 201         return 0;
 202 }
 203
 204 unsigned long efi_get_time(void)
 205 {
 206         efi_status_t status;
 207         efi_time_t eft;
 208         efi_time_cap_t cap;
 209
 210         status = efi.get_time(&eft, &cap);
 211         if (status != EFI_SUCCESS)
 212                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 213
 214         return mktime(eft.year, eft.month, eft.day, eft.hour,
 215                       eft.minute, eft.second);
 216 }
 217
 218 /*
 219  * Tell the kernel about the EFI memory map.  This might include
 220  * more than the max 128 entries that can fit in the e820 legacy
 221  * (zeropage) memory map.
 222  */
 223
 224 static void __init do_add_efi_memmap(void)
 225 {
 226         void *p;
 227
 228         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 229                 efi_memory_desc_t *md = p;
 230                 unsigned long long start = md->phys_addr;
 231                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 232                 int e820_type;
 233
 234                 switch (md->type) {
 235                 case EFI_LOADER_CODE:
 236                 case EFI_LOADER_DATA:
 237                 case EFI_BOOT_SERVICES_CODE:
 238                 case EFI_BOOT_SERVICES_DATA:
 239                 case EFI_CONVENTIONAL_MEMORY:
 240                         if (md->attribute & EFI_MEMORY_WB)
 241                                 e820_type = E820_RAM;
 242                         else
 243                                 e820_type = E820_RESERVED;
 244                         break;
 245                 case EFI_ACPI_RECLAIM_MEMORY:
 246                         e820_type = E820_ACPI;
 247                         break;
 248                 case EFI_ACPI_MEMORY_NVS:
 249                         e820_type = E820_NVS;
 250                         break;
 251                 case EFI_UNUSABLE_MEMORY:
 252                         e820_type = E820_UNUSABLE;
 253                         break;
 254                 default:
 255                         /*
 256                          * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
 257                          * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
 258                          * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
 259                          */
 260                         e820_type = E820_RESERVED;
 261                         break;
 262                 }
 263                 e820_add_region(start, size, e820_type);
 264         }
 265         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 266 }
 267
 268 void __init efi_memblock_x86_reserve_range(void)
 269 {
 270         unsigned long pmap;
 271
 272 #ifdef CONFIG_X86_32
 273         pmap = boot_params.efi_info.efi_memmap;
 274 #else
 275         pmap = (boot_params.efi_info.efi_memmap |
 276                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 277 #endif
 278         memmap.phys_map = (void *)pmap;
 279         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 280                 boot_params.efi_info.efi_memdesc_size;
 281         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 282         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 283         memblock_x86_reserve_range(pmap, pmap + memmap.nr_map * memmap.desc_size,
 284                       "EFI memmap");
 285 }
 286
 287 #if EFI_DEBUG
 288 static void __init print_efi_memmap(void)
 289 {
 290         efi_memory_desc_t *md;
 291         void *p;
 292         int i;
 293
 294         for (p = memmap.map, i = 0;
 295              p < memmap.map_end;
 296              p += memmap.desc_size, i++) {
 297                 md = p;
 298                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 299                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 300                         i, md->type, md->attribute, md->phys_addr,
 301                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 302                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 303         }
 304 }
 305 #endif  /*  EFI_DEBUG  */
 306
 307 void __init efi_init(void)
 308 {
 309         efi_config_table_t *config_tables;
 310         efi_runtime_services_t *runtime;
 311         efi_char16_t *c16;
 312         char vendor[100] = "unknown";
 313         int i = 0;
 314         void *tmp;
 315
 316 #ifdef CONFIG_X86_32
 317         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 318 #else
 319         efi_phys.systab = (efi_system_table_t *)
 320                 (boot_params.efi_info.efi_systab |
 321                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 322 #endif
 323
 324         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 325                                    sizeof(efi_system_table_t));
 326         if (efi.systab == NULL)
 327                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 328         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 329         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 330         efi.systab = &efi_systab;
 331
 332         /*
 333          * Verify the EFI Table
 334          */
 335         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 336                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 337         if ((efi.systab->hdr.revision >> 16) == 0)
 338                 printk(KERN_ERR "Warning: EFI system table version "
 339                        "%d.%02d, expected 1.00 or greater!\n",
 340                        efi.systab->hdr.revision >> 16,
 341                        efi.systab->hdr.revision & 0xffff);
 342
 343         /*
 344          * Show what we know for posterity
 345          */
 346         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 347         if (c16) {
 348                 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
 349                         vendor[i] = *c16++;
 350                 vendor[i] = '\0';
 351         } else
 352                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 353         early_iounmap(tmp, 2);
 354
 355         printk(KERN_INFO "EFI v%u.%.02u by %s\n",
 356                efi.systab->hdr.revision >> 16,
 357                efi.systab->hdr.revision & 0xffff, vendor);
 358
 359         /*
 360          * Let's see what config tables the firmware passed to us.
 361          */
 362         config_tables = early_ioremap(
 363                 efi.systab->tables,
 364                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 365         if (config_tables == NULL)
 366                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 367
 368         printk(KERN_INFO);
 369         for (i = 0; i < efi.systab->nr_tables; i++) {
 370                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 371                         efi.mps = config_tables[i].table;
 372                         printk(" MPS=0x%lx ", config_tables[i].table);
 373                 } else if (!efi_guidcmp(config_tables[i].guid,
 374                                         ACPI_20_TABLE_GUID)) {
 375                         efi.acpi20 = config_tables[i].table;
 376                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 377                 } else if (!efi_guidcmp(config_tables[i].guid,
 378                                         ACPI_TABLE_GUID)) {
 379                         efi.acpi = config_tables[i].table;
 380                         printk(" ACPI=0x%lx ", config_tables[i].table);
 381                 } else if (!efi_guidcmp(config_tables[i].guid,
 382                                         SMBIOS_TABLE_GUID)) {
 383                         efi.smbios = config_tables[i].table;
 384                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 385 #ifdef CONFIG_X86_UV
 386                 } else if (!efi_guidcmp(config_tables[i].guid,
 387                                         UV_SYSTEM_TABLE_GUID)) {
 388                         efi.uv_systab = config_tables[i].table;
 389                         printk(" UVsystab=0x%lx ", config_tables[i].table);
 390 #endif
 391                 } else if (!efi_guidcmp(config_tables[i].guid,
 392                                         HCDP_TABLE_GUID)) {
 393                         efi.hcdp = config_tables[i].table;
 394                         printk(" HCDP=0x%lx ", config_tables[i].table);
 395                 } else if (!efi_guidcmp(config_tables[i].guid,
 396                                         UGA_IO_PROTOCOL_GUID)) {
 397                         efi.uga = config_tables[i].table;
 398                         printk(" UGA=0x%lx ", config_tables[i].table);
 399                 }
 400         }
 401         printk("\n");
 402         early_iounmap(config_tables,
 403                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 404
 405         /*
 406          * Check out the runtime services table. We need to map
 407          * the runtime services table so that we can grab the physical
 408          * address of several of the EFI runtime functions, needed to
 409          * set the firmware into virtual mode.
 410          */
 411         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 412                                 sizeof(efi_runtime_services_t));
 413         if (runtime != NULL) {
 414                 /*
 415                  * We will only need *early* access to the following
 416                  * two EFI runtime services before set_virtual_address_map
 417                  * is invoked.
 418                  */
 419                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 420                 efi_phys.set_virtual_address_map =
 421                         (efi_set_virtual_address_map_t *)
 422                         runtime->set_virtual_address_map;
 423                 /*
 424                  * Make efi_get_time can be called before entering
 425                  * virtual mode.
 426                  */
 427                 efi.get_time = phys_efi_get_time;
 428         } else
 429                 printk(KERN_ERR "Could not map the EFI runtime service "
 430                        "table!\n");
 431         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 432
 433         /* Map the EFI memory map */
 434         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 435                                    memmap.nr_map * memmap.desc_size);
 436         if (memmap.map == NULL)
 437                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 438         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 439
 440         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 441                 printk(KERN_WARNING
 442                   "Kernel-defined memdesc doesn't match the one from EFI!\n");
 443
 444         if (add_efi_memmap)
 445                 do_add_efi_memmap();
 446
 447 #ifdef CONFIG_X86_32
 448         x86_platform.get_wallclock = efi_get_time;
 449         x86_platform.set_wallclock = efi_set_rtc_mmss;
 450 #endif
 451
 452         /* Setup for EFI runtime service */
 453         reboot_type = BOOT_EFI;
 454
 455 #if EFI_DEBUG
 456         print_efi_memmap();
 457 #endif
 458 }
 459
 460 void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
 461 {
 462         u64 addr, npages;
 463
 464         addr = md->virt_addr;
 465         npages = md->num_pages;
 466
 467         memrange_efi_to_native(&addr, &npages);
 468
 469         if (executable)
 470                 set_memory_x(addr, npages);
 471         else
 472                 set_memory_nx(addr, npages);
 473 }
 474
 475 static void __init runtime_code_page_mkexec(void)
 476 {
 477         efi_memory_desc_t *md;
 478         void *p;
 479
 480         /* Make EFI runtime service code area executable */
 481         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 482                 md = p;
 483
 484                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 485                         continue;
 486
 487                 efi_set_executable(md, true);
 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, *prev_md = NULL;
 502         efi_status_t status;
 503         unsigned long size;
 504         u64 end, systab, addr, npages, end_pfn;
 505         void *p, *va, *new_memmap = NULL;
 506         int count = 0;
 507
 508         efi.systab = NULL;
 509
 510         /* Merge contiguous regions of the same type and attribute */
 511         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 512                 u64 prev_size;
 513                 md = p;
 514
 515                 if (!prev_md) {
 516                         prev_md = md;
 517                         continue;
 518                 }
 519
 520                 if (prev_md->type != md->type ||
 521                     prev_md->attribute != md->attribute) {
 522                         prev_md = md;
 523                         continue;
 524                 }
 525
 526                 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
 527
 528                 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
 529                         prev_md->num_pages += md->num_pages;
 530                         md->type = EFI_RESERVED_TYPE;
 531                         md->attribute = 0;
 532                         continue;
 533                 }
 534                 prev_md = md;
 535         }
 536
 537         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 538                 md = p;
 539                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 540                         continue;
 541
 542                 size = md->num_pages << EFI_PAGE_SHIFT;
 543                 end = md->phys_addr + size;
 544
 545                 end_pfn = PFN_UP(end);
 546                 if (end_pfn <= max_low_pfn_mapped
 547                     || (end_pfn > (1UL << (32 - PAGE_SHIFT))
 548                         && end_pfn <= max_pfn_mapped))
 549                         va = __va(md->phys_addr);
 550                 else
 551                         va = efi_ioremap(md->phys_addr, size, md->type);
 552
 553                 md->virt_addr = (u64) (unsigned long) va;
 554
 555                 if (!va) {
 556                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 557                                (unsigned long long)md->phys_addr);
 558                         continue;
 559                 }
 560
 561                 if (!(md->attribute & EFI_MEMORY_WB)) {
 562                         addr = md->virt_addr;
 563                         npages = md->num_pages;
 564                         memrange_efi_to_native(&addr, &npages);
 565                         set_memory_uc(addr, npages);
 566                 }
 567
 568                 systab = (u64) (unsigned long) efi_phys.systab;
 569                 if (md->phys_addr <= systab && systab < end) {
 570                         systab += md->virt_addr - md->phys_addr;
 571                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 572                 }
 573                 new_memmap = krealloc(new_memmap,
 574                                       (count + 1) * memmap.desc_size,
 575                                       GFP_KERNEL);
 576                 memcpy(new_memmap + (count * memmap.desc_size), md,
 577                        memmap.desc_size);
 578                 count++;
 579         }
 580
 581         BUG_ON(!efi.systab);
 582
 583         status = phys_efi_set_virtual_address_map(
 584                 memmap.desc_size * count,
 585                 memmap.desc_size,
 586                 memmap.desc_version,
 587                 (efi_memory_desc_t *)__pa(new_memmap));
 588
 589         if (status != EFI_SUCCESS) {
 590                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 591                        "(status=%lx)!\n", status);
 592                 panic("EFI call to SetVirtualAddressMap() failed!");
 593         }
 594
 595         /*
 596          * Now that EFI is in virtual mode, update the function
 597          * pointers in the runtime service table to the new virtual addresses.
 598          *
 599          * Call EFI services through wrapper functions.
 600          */
 601         efi.get_time = virt_efi_get_time;
 602         efi.set_time = virt_efi_set_time;
 603         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 604         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 605         efi.get_variable = virt_efi_get_variable;
 606         efi.get_next_variable = virt_efi_get_next_variable;
 607         efi.set_variable = virt_efi_set_variable;
 608         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 609         efi.reset_system = virt_efi_reset_system;
 610         efi.set_virtual_address_map = NULL;
 611         if (__supported_pte_mask & _PAGE_NX)
 612                 runtime_code_page_mkexec();
 613         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 614         memmap.map = NULL;
 615         kfree(new_memmap);
 616 }
 617
 618 /*
 619  * Convenience functions to obtain memory types and attributes
 620  */
 621 u32 efi_mem_type(unsigned long phys_addr)
 622 {
 623         efi_memory_desc_t *md;
 624         void *p;
 625
 626         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 627                 md = p;
 628                 if ((md->phys_addr <= phys_addr) &&
 629                     (phys_addr < (md->phys_addr +
 630                                   (md->num_pages << EFI_PAGE_SHIFT))))
 631                         return md->type;
 632         }
 633         return 0;
 634 }
 635
 636 u64 efi_mem_attributes(unsigned long phys_addr)
 637 {
 638         efi_memory_desc_t *md;
 639         void *p;
 640
 641         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 642                 md = p;
 643                 if ((md->phys_addr <= phys_addr) &&
 644                     (phys_addr < (md->phys_addr +
 645                                   (md->num_pages << EFI_PAGE_SHIFT))))
 646                         return md->attribute;
 647         }
 648         return 0;
 649 }