arch/i386/kernel/efi.c

   1 /*
   2  * Extensible Firmware Interface
   3  *
   4  * Based on Extensible Firmware Interface Specification version 1.0
   5  *
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  * Copyright (C) 1999-2002 Hewlett-Packard Co.
   9  *      David Mosberger-Tang <davidm@hpl.hp.com>
  10  *      Stephane Eranian <eranian@hpl.hp.com>
  11  *
  12  * All EFI Runtime Services are not implemented yet as EFI only
  13  * supports physical mode addressing on SoftSDV. This is to be fixed
  14  * in a future version.  --drummond 1999-07-20
  15  *
  16  * Implemented EFI runtime services and virtual mode calls.  --davidm
  17  *
  18  * Goutham Rao: <goutham.rao@intel.com>
  19  *      Skip non-WB memory and ignore empty memory ranges.
  20  */
  21
  22 #include <linux/config.h>
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/mm.h>
  26 #include <linux/types.h>
  27 #include <linux/time.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/bootmem.h>
  30 #include <linux/ioport.h>
  31 #include <linux/module.h>
  32 #include <linux/efi.h>
  33 #include <linux/kexec.h>
  34
  35 #include <asm/setup.h>
  36 #include <asm/io.h>
  37 #include <asm/page.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/processor.h>
  40 #include <asm/desc.h>
  41 #include <asm/tlbflush.h>
  42
  43 #define EFI_DEBUG       0
  44 #define PFX             "EFI: "
  45
  46 extern efi_status_t asmlinkage efi_call_phys(void *, ...);
  47
  48 struct efi efi;
  49 EXPORT_SYMBOL(efi);
  50 static struct efi efi_phys;
  51 struct efi_memory_map memmap;
  52
  53 /*
  54  * We require an early boot_ioremap mapping mechanism initially
  55  */
  56 extern void * boot_ioremap(unsigned long, unsigned long);
  57
  58 /*
  59  * To make EFI call EFI runtime service in physical addressing mode we need
  60  * prelog/epilog before/after the invocation to disable interrupt, to
  61  * claim EFI runtime service handler exclusively and to duplicate a memory in
  62  * low memory space say 0 - 3G.
  63  */
  64
  65 static unsigned long efi_rt_eflags;
  66 static DEFINE_SPINLOCK(efi_rt_lock);
  67 static pgd_t efi_bak_pg_dir_pointer[2];
  68
  69 static void efi_call_phys_prelog(void)
  70 {
  71         unsigned long cr4;
  72         unsigned long temp;
  73
  74         spin_lock(&efi_rt_lock);
  75         local_irq_save(efi_rt_eflags);
  76
  77         /*
  78          * If I don't have PSE, I should just duplicate two entries in page
  79          * directory. If I have PSE, I just need to duplicate one entry in
  80          * page directory.
  81          */
  82         cr4 = read_cr4();
  83
  84         if (cr4 & X86_CR4_PSE) {
  85                 efi_bak_pg_dir_pointer[0].pgd =
  86                     swapper_pg_dir[pgd_index(0)].pgd;
  87                 swapper_pg_dir[0].pgd =
  88                     swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
  89         } else {
  90                 efi_bak_pg_dir_pointer[0].pgd =
  91                     swapper_pg_dir[pgd_index(0)].pgd;
  92                 efi_bak_pg_dir_pointer[1].pgd =
  93                     swapper_pg_dir[pgd_index(0x400000)].pgd;
  94                 swapper_pg_dir[pgd_index(0)].pgd =
  95                     swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
  96                 temp = PAGE_OFFSET + 0x400000;
  97                 swapper_pg_dir[pgd_index(0x400000)].pgd =
  98                     swapper_pg_dir[pgd_index(temp)].pgd;
  99         }
 100
 101         /*
 102          * After the lock is released, the original page table is restored.
 103          */
 104         local_flush_tlb();
 105
 106         cpu_gdt_descr[0].address = __pa(cpu_gdt_descr[0].address);
 107         load_gdt((struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0]));
 108 }
 109
 110 static void efi_call_phys_epilog(void)
 111 {
 112         unsigned long cr4;
 113
 114         cpu_gdt_descr[0].address =
 115                 (unsigned long) __va(cpu_gdt_descr[0].address);
 116         load_gdt(&cpu_gdt_descr[0]);
 117         cr4 = read_cr4();
 118
 119         if (cr4 & X86_CR4_PSE) {
 120                 swapper_pg_dir[pgd_index(0)].pgd =
 121                     efi_bak_pg_dir_pointer[0].pgd;
 122         } else {
 123                 swapper_pg_dir[pgd_index(0)].pgd =
 124                     efi_bak_pg_dir_pointer[0].pgd;
 125                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 126                     efi_bak_pg_dir_pointer[1].pgd;
 127         }
 128
 129         /*
 130          * After the lock is released, the original page table is restored.
 131          */
 132         local_flush_tlb();
 133
 134         local_irq_restore(efi_rt_eflags);
 135         spin_unlock(&efi_rt_lock);
 136 }
 137
 138 static efi_status_t
 139 phys_efi_set_virtual_address_map(unsigned long memory_map_size,
 140                                  unsigned long descriptor_size,
 141                                  u32 descriptor_version,
 142                                  efi_memory_desc_t *virtual_map)
 143 {
 144         efi_status_t status;
 145
 146         efi_call_phys_prelog();
 147         status = efi_call_phys(efi_phys.set_virtual_address_map,
 148                                      memory_map_size, descriptor_size,
 149                                      descriptor_version, virtual_map);
 150         efi_call_phys_epilog();
 151         return status;
 152 }
 153
 154 static efi_status_t
 155 phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 156 {
 157         efi_status_t status;
 158
 159         efi_call_phys_prelog();
 160         status = efi_call_phys(efi_phys.get_time, tm, tc);
 161         efi_call_phys_epilog();
 162         return status;
 163 }
 164
 165 inline int efi_set_rtc_mmss(unsigned long nowtime)
 166 {
 167         int real_seconds, real_minutes;
 168         efi_status_t    status;
 169         efi_time_t      eft;
 170         efi_time_cap_t  cap;
 171
 172         spin_lock(&efi_rt_lock);
 173         status = efi.get_time(&eft, &cap);
 174         spin_unlock(&efi_rt_lock);
 175         if (status != EFI_SUCCESS)
 176                 panic("Ooops, efitime: can't read time!\n");
 177         real_seconds = nowtime % 60;
 178         real_minutes = nowtime / 60;
 179
 180         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 181                 real_minutes += 30;
 182         real_minutes %= 60;
 183
 184         eft.minute = real_minutes;
 185         eft.second = real_seconds;
 186
 187         if (status != EFI_SUCCESS) {
 188                 printk("Ooops: efitime: can't read time!\n");
 189                 return -1;
 190         }
 191         return 0;
 192 }
 193 /*
 194  * This should only be used during kernel init and before runtime
 195  * services have been remapped, therefore, we'll need to call in physical
 196  * mode.  Note, this call isn't used later, so mark it __init.
 197  */
 198 inline unsigned long __init efi_get_time(void)
 199 {
 200         efi_status_t status;
 201         efi_time_t eft;
 202         efi_time_cap_t cap;
 203
 204         status = phys_efi_get_time(&eft, &cap);
 205         if (status != EFI_SUCCESS)
 206                 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
 207
 208         return mktime(eft.year, eft.month, eft.day, eft.hour,
 209                         eft.minute, eft.second);
 210 }
 211
 212 int is_available_memory(efi_memory_desc_t * md)
 213 {
 214         if (!(md->attribute & EFI_MEMORY_WB))
 215                 return 0;
 216
 217         switch (md->type) {
 218                 case EFI_LOADER_CODE:
 219                 case EFI_LOADER_DATA:
 220                 case EFI_BOOT_SERVICES_CODE:
 221                 case EFI_BOOT_SERVICES_DATA:
 222                 case EFI_CONVENTIONAL_MEMORY:
 223                         return 1;
 224         }
 225         return 0;
 226 }
 227
 228 /*
 229  * We need to map the EFI memory map again after paging_init().
 230  */
 231 void __init efi_map_memmap(void)
 232 {
 233         memmap.map = NULL;
 234
 235         memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
 236                         (memmap.nr_map * memmap.desc_size));
 237         if (memmap.map == NULL)
 238                 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
 239
 240         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 241 }
 242
 243 #if EFI_DEBUG
 244 static void __init print_efi_memmap(void)
 245 {
 246         efi_memory_desc_t *md;
 247         void *p;
 248         int i;
 249
 250         for (p = memmap.map, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
 251                 md = p;
 252                 printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
 253                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 254                         i, md->type, md->attribute, md->phys_addr,
 255                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 256                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 257         }
 258 }
 259 #endif  /*  EFI_DEBUG  */
 260
 261 /*
 262  * Walks the EFI memory map and calls CALLBACK once for each EFI
 263  * memory descriptor that has memory that is available for kernel use.
 264  */
 265 void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
 266 {
 267         int prev_valid = 0;
 268         struct range {
 269                 unsigned long start;
 270                 unsigned long end;
 271         } prev, curr;
 272         efi_memory_desc_t *md;
 273         unsigned long start, end;
 274         void *p;
 275
 276         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 277                 md = p;
 278
 279                 if ((md->num_pages == 0) || (!is_available_memory(md)))
 280                         continue;
 281
 282                 curr.start = md->phys_addr;
 283                 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 284
 285                 if (!prev_valid) {
 286                         prev = curr;
 287                         prev_valid = 1;
 288                 } else {
 289                         if (curr.start < prev.start)
 290                                 printk(KERN_INFO PFX "Unordered memory map\n");
 291                         if (prev.end == curr.start)
 292                                 prev.end = curr.end;
 293                         else {
 294                                 start =
 295                                     (unsigned long) (PAGE_ALIGN(prev.start));
 296                                 end = (unsigned long) (prev.end & PAGE_MASK);
 297                                 if ((end > start)
 298                                     && (*callback) (start, end, arg) < 0)
 299                                         return;
 300                                 prev = curr;
 301                         }
 302                 }
 303         }
 304         if (prev_valid) {
 305                 start = (unsigned long) PAGE_ALIGN(prev.start);
 306                 end = (unsigned long) (prev.end & PAGE_MASK);
 307                 if (end > start)
 308                         (*callback) (start, end, arg);
 309         }
 310 }
 311
 312 void __init efi_init(void)
 313 {
 314         efi_config_table_t *config_tables;
 315         efi_runtime_services_t *runtime;
 316         efi_char16_t *c16;
 317         char vendor[100] = "unknown";
 318         unsigned long num_config_tables;
 319         int i = 0;
 320
 321         memset(&efi, 0, sizeof(efi) );
 322         memset(&efi_phys, 0, sizeof(efi_phys));
 323
 324         efi_phys.systab = EFI_SYSTAB;
 325         memmap.phys_map = EFI_MEMMAP;
 326         memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
 327         memmap.desc_version = EFI_MEMDESC_VERSION;
 328         memmap.desc_size = EFI_MEMDESC_SIZE;
 329
 330         efi.systab = (efi_system_table_t *)
 331                 boot_ioremap((unsigned long) efi_phys.systab,
 332                         sizeof(efi_system_table_t));
 333         /*
 334          * Verify the EFI Table
 335          */
 336         if (efi.systab == NULL)
 337                 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
 338         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 339                 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
 340         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 341                 printk(KERN_ERR PFX
 342                        "Warning: EFI system table major version mismatch: "
 343                        "got %d.%02d, expected %d.%02d\n",
 344                        efi.systab->hdr.revision >> 16,
 345                        efi.systab->hdr.revision & 0xffff,
 346                        EFI_SYSTEM_TABLE_REVISION >> 16,
 347                        EFI_SYSTEM_TABLE_REVISION & 0xffff);
 348         /*
 349          * Grab some details from the system table
 350          */
 351         num_config_tables = efi.systab->nr_tables;
 352         config_tables = (efi_config_table_t *)efi.systab->tables;
 353         runtime = efi.systab->runtime;
 354
 355         /*
 356          * Show what we know for posterity
 357          */
 358         c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
 359         if (c16) {
 360                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 361                         vendor[i] = *c16++;
 362                 vendor[i] = '\0';
 363         } else
 364                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 365
 366         printk(KERN_INFO PFX "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 = (efi_config_table_t *)
 374                                 boot_ioremap((unsigned long) config_tables,
 375                                 num_config_tables * sizeof(efi_config_table_t));
 376
 377         if (config_tables == NULL)
 378                 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
 379
 380         for (i = 0; i < num_config_tables; i++) {
 381                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 382                         efi.mps = (void *)config_tables[i].table;
 383                         printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
 384                 } else
 385                     if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 386                         efi.acpi20 = __va(config_tables[i].table);
 387                         printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
 388                 } else
 389                     if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 390                         efi.acpi = __va(config_tables[i].table);
 391                         printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
 392                 } else
 393                     if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 394                         efi.smbios = (void *) config_tables[i].table;
 395                         printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
 396                 } else
 397                     if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 398                         efi.hcdp = (void *)config_tables[i].table;
 399                         printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
 400                 } else
 401                     if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
 402                         efi.uga = (void *)config_tables[i].table;
 403                         printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
 404                 }
 405         }
 406         printk("\n");
 407
 408         /*
 409          * Check out the runtime services table. We need to map
 410          * the runtime services table so that we can grab the physical
 411          * address of several of the EFI runtime functions, needed to
 412          * set the firmware into virtual mode.
 413          */
 414
 415         runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
 416                                                 runtime,
 417                                                 sizeof(efi_runtime_services_t));
 418         if (runtime != NULL) {
 419                 /*
 420                  * We will only need *early* access to the following
 421                  * two EFI runtime services before set_virtual_address_map
 422                  * is invoked.
 423                  */
 424                 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
 425                 efi_phys.set_virtual_address_map =
 426                         (efi_set_virtual_address_map_t *)
 427                                 runtime->set_virtual_address_map;
 428         } else
 429                 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
 430
 431         /* Map the EFI memory map for use until paging_init() */
 432         memmap.map = boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
 433         if (memmap.map == NULL)
 434                 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
 435
 436         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 437
 438 #if EFI_DEBUG
 439         print_efi_memmap();
 440 #endif
 441 }
 442
 443 static inline void __init check_range_for_systab(efi_memory_desc_t *md)
 444 {
 445         if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) &&
 446                 ((unsigned long)efi_phys.systab < md->phys_addr +
 447                 ((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) {
 448                 unsigned long addr;
 449
 450                 addr = md->virt_addr - md->phys_addr +
 451                         (unsigned long)efi_phys.systab;
 452                 efi.systab = (efi_system_table_t *)addr;
 453         }
 454 }
 455
 456 /*
 457  * This function will switch the EFI runtime services to virtual mode.
 458  * Essentially, look through the EFI memmap and map every region that
 459  * has the runtime attribute bit set in its memory descriptor and update
 460  * that memory descriptor with the virtual address obtained from ioremap().
 461  * This enables the runtime services to be called without having to
 462  * thunk back into physical mode for every invocation.
 463  */
 464
 465 void __init efi_enter_virtual_mode(void)
 466 {
 467         efi_memory_desc_t *md;
 468         efi_status_t status;
 469         void *p;
 470
 471         efi.systab = NULL;
 472
 473         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 474                 md = p;
 475
 476                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 477                         continue;
 478
 479                 md->virt_addr = (unsigned long)ioremap(md->phys_addr,
 480                         md->num_pages << EFI_PAGE_SHIFT);
 481                 if (!(unsigned long)md->virt_addr) {
 482                         printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
 483                                 (unsigned long)md->phys_addr);
 484                 }
 485                 /* update the virtual address of the EFI system table */
 486                 check_range_for_systab(md);
 487         }
 488
 489         if (!efi.systab)
 490                 BUG();
 491
 492         status = phys_efi_set_virtual_address_map(
 493                         memmap.desc_size * memmap.nr_map,
 494                         memmap.desc_size,
 495                         memmap.desc_version,
 496                         memmap.phys_map);
 497
 498         if (status != EFI_SUCCESS) {
 499                 printk (KERN_ALERT "You are screwed! "
 500                         "Unable to switch EFI into virtual mode "
 501                         "(status=%lx)\n", status);
 502                 panic("EFI call to SetVirtualAddressMap() failed!");
 503         }
 504
 505         /*
 506          * Now that EFI is in virtual mode, update the function
 507          * pointers in the runtime service table to the new virtual addresses.
 508          */
 509
 510         efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
 511         efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
 512         efi.get_wakeup_time = (efi_get_wakeup_time_t *)
 513                                         efi.systab->runtime->get_wakeup_time;
 514         efi.set_wakeup_time = (efi_set_wakeup_time_t *)
 515                                         efi.systab->runtime->set_wakeup_time;
 516         efi.get_variable = (efi_get_variable_t *)
 517                                         efi.systab->runtime->get_variable;
 518         efi.get_next_variable = (efi_get_next_variable_t *)
 519                                         efi.systab->runtime->get_next_variable;
 520         efi.set_variable = (efi_set_variable_t *)
 521                                         efi.systab->runtime->set_variable;
 522         efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
 523                                         efi.systab->runtime->get_next_high_mono_count;
 524         efi.reset_system = (efi_reset_system_t *)
 525                                         efi.systab->runtime->reset_system;
 526 }
 527
 528 void __init
 529 efi_initialize_iomem_resources(struct resource *code_resource,
 530                                struct resource *data_resource)
 531 {
 532         struct resource *res;
 533         efi_memory_desc_t *md;
 534         void *p;
 535
 536         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 537                 md = p;
 538
 539                 if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
 540                     0x100000000ULL)
 541                         continue;
 542                 res = alloc_bootmem_low(sizeof(struct resource));
 543                 switch (md->type) {
 544                 case EFI_RESERVED_TYPE:
 545                         res->name = "Reserved Memory";
 546                         break;
 547                 case EFI_LOADER_CODE:
 548                         res->name = "Loader Code";
 549                         break;
 550                 case EFI_LOADER_DATA:
 551                         res->name = "Loader Data";
 552                         break;
 553                 case EFI_BOOT_SERVICES_DATA:
 554                         res->name = "BootServices Data";
 555                         break;
 556                 case EFI_BOOT_SERVICES_CODE:
 557                         res->name = "BootServices Code";
 558                         break;
 559                 case EFI_RUNTIME_SERVICES_CODE:
 560                         res->name = "Runtime Service Code";
 561                         break;
 562                 case EFI_RUNTIME_SERVICES_DATA:
 563                         res->name = "Runtime Service Data";
 564                         break;
 565                 case EFI_CONVENTIONAL_MEMORY:
 566                         res->name = "Conventional Memory";
 567                         break;
 568                 case EFI_UNUSABLE_MEMORY:
 569                         res->name = "Unusable Memory";
 570                         break;
 571                 case EFI_ACPI_RECLAIM_MEMORY:
 572                         res->name = "ACPI Reclaim";
 573                         break;
 574                 case EFI_ACPI_MEMORY_NVS:
 575                         res->name = "ACPI NVS";
 576                         break;
 577                 case EFI_MEMORY_MAPPED_IO:
 578                         res->name = "Memory Mapped IO";
 579                         break;
 580                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 581                         res->name = "Memory Mapped IO Port Space";
 582                         break;
 583                 default:
 584                         res->name = "Reserved";
 585                         break;
 586                 }
 587                 res->start = md->phys_addr;
 588                 res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
 589                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 590                 if (request_resource(&iomem_resource, res) < 0)
 591                         printk(KERN_ERR PFX "Failed to allocate res %s : 0x%lx-0x%lx\n",
 592                                 res->name, res->start, res->end);
 593                 /*
 594                  * We don't know which region contains kernel data so we try
 595                  * it repeatedly and let the resource manager test it.
 596                  */
 597                 if (md->type == EFI_CONVENTIONAL_MEMORY) {
 598                         request_resource(res, code_resource);
 599                         request_resource(res, data_resource);
 600 #ifdef CONFIG_KEXEC
 601                         request_resource(res, &crashk_res);
 602 #endif
 603                 }
 604         }
 605 }
 606
 607 /*
 608  * Convenience functions to obtain memory types and attributes
 609  */
 610
 611 u32 efi_mem_type(unsigned long phys_addr)
 612 {
 613         efi_memory_desc_t *md;
 614         void *p;
 615
 616         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 617                 md = p;
 618                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 619                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 620                         return md->type;
 621         }
 622         return 0;
 623 }
 624
 625 u64 efi_mem_attributes(unsigned long phys_addr)
 626 {
 627         efi_memory_desc_t *md;
 628         void *p;
 629
 630         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 631                 md = p;
 632                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 633                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 634                         return md->attribute;
 635         }
 636         return 0;
 637 }