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         per_cpu(cpu_gdt_descr, 0).address =
 107                                  __pa(per_cpu(cpu_gdt_descr, 0).address);
 108         load_gdt((struct Xgt_desc_struct *)__pa(&per_cpu(cpu_gdt_descr, 0)));
 109 }
 110
 111 static void efi_call_phys_epilog(void)
 112 {
 113         unsigned long cr4;
 114
 115         per_cpu(cpu_gdt_descr, 0).address =
 116                         (unsigned long)__va(per_cpu(cpu_gdt_descr, 0).address);
 117         load_gdt((struct Xgt_desc_struct *)__va(&per_cpu(cpu_gdt_descr, 0)));
 118
 119         cr4 = read_cr4();
 120
 121         if (cr4 & X86_CR4_PSE) {
 122                 swapper_pg_dir[pgd_index(0)].pgd =
 123                     efi_bak_pg_dir_pointer[0].pgd;
 124         } else {
 125                 swapper_pg_dir[pgd_index(0)].pgd =
 126                     efi_bak_pg_dir_pointer[0].pgd;
 127                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 128                     efi_bak_pg_dir_pointer[1].pgd;
 129         }
 130
 131         /*
 132          * After the lock is released, the original page table is restored.
 133          */
 134         local_flush_tlb();
 135
 136         local_irq_restore(efi_rt_eflags);
 137         spin_unlock(&efi_rt_lock);
 138 }
 139
 140 static efi_status_t
 141 phys_efi_set_virtual_address_map(unsigned long memory_map_size,
 142                                  unsigned long descriptor_size,
 143                                  u32 descriptor_version,
 144                                  efi_memory_desc_t *virtual_map)
 145 {
 146         efi_status_t status;
 147
 148         efi_call_phys_prelog();
 149         status = efi_call_phys(efi_phys.set_virtual_address_map,
 150                                      memory_map_size, descriptor_size,
 151                                      descriptor_version, virtual_map);
 152         efi_call_phys_epilog();
 153         return status;
 154 }
 155
 156 static efi_status_t
 157 phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 158 {
 159         efi_status_t status;
 160
 161         efi_call_phys_prelog();
 162         status = efi_call_phys(efi_phys.get_time, tm, tc);
 163         efi_call_phys_epilog();
 164         return status;
 165 }
 166
 167 inline int efi_set_rtc_mmss(unsigned long nowtime)
 168 {
 169         int real_seconds, real_minutes;
 170         efi_status_t    status;
 171         efi_time_t      eft;
 172         efi_time_cap_t  cap;
 173
 174         spin_lock(&efi_rt_lock);
 175         status = efi.get_time(&eft, &cap);
 176         spin_unlock(&efi_rt_lock);
 177         if (status != EFI_SUCCESS)
 178                 panic("Ooops, efitime: can't read time!\n");
 179         real_seconds = nowtime % 60;
 180         real_minutes = nowtime / 60;
 181
 182         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 183                 real_minutes += 30;
 184         real_minutes %= 60;
 185
 186         eft.minute = real_minutes;
 187         eft.second = real_seconds;
 188
 189         if (status != EFI_SUCCESS) {
 190                 printk("Ooops: efitime: can't read time!\n");
 191                 return -1;
 192         }
 193         return 0;
 194 }
 195 /*
 196  * This should only be used during kernel init and before runtime
 197  * services have been remapped, therefore, we'll need to call in physical
 198  * mode.  Note, this call isn't used later, so mark it __init.
 199  */
 200 inline unsigned long __init efi_get_time(void)
 201 {
 202         efi_status_t status;
 203         efi_time_t eft;
 204         efi_time_cap_t cap;
 205
 206         status = phys_efi_get_time(&eft, &cap);
 207         if (status != EFI_SUCCESS)
 208                 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
 209
 210         return mktime(eft.year, eft.month, eft.day, eft.hour,
 211                         eft.minute, eft.second);
 212 }
 213
 214 int is_available_memory(efi_memory_desc_t * md)
 215 {
 216         if (!(md->attribute & EFI_MEMORY_WB))
 217                 return 0;
 218
 219         switch (md->type) {
 220                 case EFI_LOADER_CODE:
 221                 case EFI_LOADER_DATA:
 222                 case EFI_BOOT_SERVICES_CODE:
 223                 case EFI_BOOT_SERVICES_DATA:
 224                 case EFI_CONVENTIONAL_MEMORY:
 225                         return 1;
 226         }
 227         return 0;
 228 }
 229
 230 /*
 231  * We need to map the EFI memory map again after paging_init().
 232  */
 233 void __init efi_map_memmap(void)
 234 {
 235         memmap.map = NULL;
 236
 237         memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
 238                         (memmap.nr_map * memmap.desc_size));
 239         if (memmap.map == NULL)
 240                 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
 241
 242         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 243 }
 244
 245 #if EFI_DEBUG
 246 static void __init print_efi_memmap(void)
 247 {
 248         efi_memory_desc_t *md;
 249         void *p;
 250         int i;
 251
 252         for (p = memmap.map, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
 253                 md = p;
 254                 printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
 255                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 256                         i, md->type, md->attribute, md->phys_addr,
 257                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 258                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 259         }
 260 }
 261 #endif  /*  EFI_DEBUG  */
 262
 263 /*
 264  * Walks the EFI memory map and calls CALLBACK once for each EFI
 265  * memory descriptor that has memory that is available for kernel use.
 266  */
 267 void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
 268 {
 269         int prev_valid = 0;
 270         struct range {
 271                 unsigned long start;
 272                 unsigned long end;
 273         } prev, curr;
 274         efi_memory_desc_t *md;
 275         unsigned long start, end;
 276         void *p;
 277
 278         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 279                 md = p;
 280
 281                 if ((md->num_pages == 0) || (!is_available_memory(md)))
 282                         continue;
 283
 284                 curr.start = md->phys_addr;
 285                 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 286
 287                 if (!prev_valid) {
 288                         prev = curr;
 289                         prev_valid = 1;
 290                 } else {
 291                         if (curr.start < prev.start)
 292                                 printk(KERN_INFO PFX "Unordered memory map\n");
 293                         if (prev.end == curr.start)
 294                                 prev.end = curr.end;
 295                         else {
 296                                 start =
 297                                     (unsigned long) (PAGE_ALIGN(prev.start));
 298                                 end = (unsigned long) (prev.end & PAGE_MASK);
 299                                 if ((end > start)
 300                                     && (*callback) (start, end, arg) < 0)
 301                                         return;
 302                                 prev = curr;
 303                         }
 304                 }
 305         }
 306         if (prev_valid) {
 307                 start = (unsigned long) PAGE_ALIGN(prev.start);
 308                 end = (unsigned long) (prev.end & PAGE_MASK);
 309                 if (end > start)
 310                         (*callback) (start, end, arg);
 311         }
 312 }
 313
 314 void __init efi_init(void)
 315 {
 316         efi_config_table_t *config_tables;
 317         efi_runtime_services_t *runtime;
 318         efi_char16_t *c16;
 319         char vendor[100] = "unknown";
 320         unsigned long num_config_tables;
 321         int i = 0;
 322
 323         memset(&efi, 0, sizeof(efi) );
 324         memset(&efi_phys, 0, sizeof(efi_phys));
 325
 326         efi_phys.systab = EFI_SYSTAB;
 327         memmap.phys_map = EFI_MEMMAP;
 328         memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
 329         memmap.desc_version = EFI_MEMDESC_VERSION;
 330         memmap.desc_size = EFI_MEMDESC_SIZE;
 331
 332         efi.systab = (efi_system_table_t *)
 333                 boot_ioremap((unsigned long) efi_phys.systab,
 334                         sizeof(efi_system_table_t));
 335         /*
 336          * Verify the EFI Table
 337          */
 338         if (efi.systab == NULL)
 339                 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
 340         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 341                 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
 342         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 343                 printk(KERN_ERR PFX
 344                        "Warning: EFI system table major version mismatch: "
 345                        "got %d.%02d, expected %d.%02d\n",
 346                        efi.systab->hdr.revision >> 16,
 347                        efi.systab->hdr.revision & 0xffff,
 348                        EFI_SYSTEM_TABLE_REVISION >> 16,
 349                        EFI_SYSTEM_TABLE_REVISION & 0xffff);
 350         /*
 351          * Grab some details from the system table
 352          */
 353         num_config_tables = efi.systab->nr_tables;
 354         config_tables = (efi_config_table_t *)efi.systab->tables;
 355         runtime = efi.systab->runtime;
 356
 357         /*
 358          * Show what we know for posterity
 359          */
 360         c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
 361         if (c16) {
 362                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 363                         vendor[i] = *c16++;
 364                 vendor[i] = '\0';
 365         } else
 366                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 367
 368         printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n",
 369                efi.systab->hdr.revision >> 16,
 370                efi.systab->hdr.revision & 0xffff, vendor);
 371
 372         /*
 373          * Let's see what config tables the firmware passed to us.
 374          */
 375         config_tables = (efi_config_table_t *)
 376                                 boot_ioremap((unsigned long) config_tables,
 377                                 num_config_tables * sizeof(efi_config_table_t));
 378
 379         if (config_tables == NULL)
 380                 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
 381
 382         for (i = 0; i < num_config_tables; i++) {
 383                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 384                         efi.mps = (void *)config_tables[i].table;
 385                         printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
 386                 } else
 387                     if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 388                         efi.acpi20 = __va(config_tables[i].table);
 389                         printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
 390                 } else
 391                     if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 392                         efi.acpi = __va(config_tables[i].table);
 393                         printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
 394                 } else
 395                     if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 396                         efi.smbios = (void *) config_tables[i].table;
 397                         printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
 398                 } else
 399                     if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 400                         efi.hcdp = (void *)config_tables[i].table;
 401                         printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
 402                 } else
 403                     if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
 404                         efi.uga = (void *)config_tables[i].table;
 405                         printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
 406                 }
 407         }
 408         printk("\n");
 409
 410         /*
 411          * Check out the runtime services table. We need to map
 412          * the runtime services table so that we can grab the physical
 413          * address of several of the EFI runtime functions, needed to
 414          * set the firmware into virtual mode.
 415          */
 416
 417         runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
 418                                                 runtime,
 419                                                 sizeof(efi_runtime_services_t));
 420         if (runtime != NULL) {
 421                 /*
 422                  * We will only need *early* access to the following
 423                  * two EFI runtime services before set_virtual_address_map
 424                  * is invoked.
 425                  */
 426                 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
 427                 efi_phys.set_virtual_address_map =
 428                         (efi_set_virtual_address_map_t *)
 429                                 runtime->set_virtual_address_map;
 430         } else
 431                 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
 432
 433         /* Map the EFI memory map for use until paging_init() */
 434         memmap.map = boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
 435         if (memmap.map == NULL)
 436                 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
 437
 438         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 439
 440 #if EFI_DEBUG
 441         print_efi_memmap();
 442 #endif
 443 }
 444
 445 static inline void __init check_range_for_systab(efi_memory_desc_t *md)
 446 {
 447         if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) &&
 448                 ((unsigned long)efi_phys.systab < md->phys_addr +
 449                 ((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) {
 450                 unsigned long addr;
 451
 452                 addr = md->virt_addr - md->phys_addr +
 453                         (unsigned long)efi_phys.systab;
 454                 efi.systab = (efi_system_table_t *)addr;
 455         }
 456 }
 457
 458 /*
 459  * This function will switch the EFI runtime services to virtual mode.
 460  * Essentially, look through the EFI memmap and map every region that
 461  * has the runtime attribute bit set in its memory descriptor and update
 462  * that memory descriptor with the virtual address obtained from ioremap().
 463  * This enables the runtime services to be called without having to
 464  * thunk back into physical mode for every invocation.
 465  */
 466
 467 void __init efi_enter_virtual_mode(void)
 468 {
 469         efi_memory_desc_t *md;
 470         efi_status_t status;
 471         void *p;
 472
 473         efi.systab = NULL;
 474
 475         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 476                 md = p;
 477
 478                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 479                         continue;
 480
 481                 md->virt_addr = (unsigned long)ioremap(md->phys_addr,
 482                         md->num_pages << EFI_PAGE_SHIFT);
 483                 if (!(unsigned long)md->virt_addr) {
 484                         printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
 485                                 (unsigned long)md->phys_addr);
 486                 }
 487                 /* update the virtual address of the EFI system table */
 488                 check_range_for_systab(md);
 489         }
 490
 491         if (!efi.systab)
 492                 BUG();
 493
 494         status = phys_efi_set_virtual_address_map(
 495                         memmap.desc_size * memmap.nr_map,
 496                         memmap.desc_size,
 497                         memmap.desc_version,
 498                         memmap.phys_map);
 499
 500         if (status != EFI_SUCCESS) {
 501                 printk (KERN_ALERT "You are screwed! "
 502                         "Unable to switch EFI into virtual mode "
 503                         "(status=%lx)\n", status);
 504                 panic("EFI call to SetVirtualAddressMap() failed!");
 505         }
 506
 507         /*
 508          * Now that EFI is in virtual mode, update the function
 509          * pointers in the runtime service table to the new virtual addresses.
 510          */
 511
 512         efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
 513         efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
 514         efi.get_wakeup_time = (efi_get_wakeup_time_t *)
 515                                         efi.systab->runtime->get_wakeup_time;
 516         efi.set_wakeup_time = (efi_set_wakeup_time_t *)
 517                                         efi.systab->runtime->set_wakeup_time;
 518         efi.get_variable = (efi_get_variable_t *)
 519                                         efi.systab->runtime->get_variable;
 520         efi.get_next_variable = (efi_get_next_variable_t *)
 521                                         efi.systab->runtime->get_next_variable;
 522         efi.set_variable = (efi_set_variable_t *)
 523                                         efi.systab->runtime->set_variable;
 524         efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
 525                                         efi.systab->runtime->get_next_high_mono_count;
 526         efi.reset_system = (efi_reset_system_t *)
 527                                         efi.systab->runtime->reset_system;
 528 }
 529
 530 void __init
 531 efi_initialize_iomem_resources(struct resource *code_resource,
 532                                struct resource *data_resource)
 533 {
 534         struct resource *res;
 535         efi_memory_desc_t *md;
 536         void *p;
 537
 538         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 539                 md = p;
 540
 541                 if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
 542                     0x100000000ULL)
 543                         continue;
 544                 res = alloc_bootmem_low(sizeof(struct resource));
 545                 switch (md->type) {
 546                 case EFI_RESERVED_TYPE:
 547                         res->name = "Reserved Memory";
 548                         break;
 549                 case EFI_LOADER_CODE:
 550                         res->name = "Loader Code";
 551                         break;
 552                 case EFI_LOADER_DATA:
 553                         res->name = "Loader Data";
 554                         break;
 555                 case EFI_BOOT_SERVICES_DATA:
 556                         res->name = "BootServices Data";
 557                         break;
 558                 case EFI_BOOT_SERVICES_CODE:
 559                         res->name = "BootServices Code";
 560                         break;
 561                 case EFI_RUNTIME_SERVICES_CODE:
 562                         res->name = "Runtime Service Code";
 563                         break;
 564                 case EFI_RUNTIME_SERVICES_DATA:
 565                         res->name = "Runtime Service Data";
 566                         break;
 567                 case EFI_CONVENTIONAL_MEMORY:
 568                         res->name = "Conventional Memory";
 569                         break;
 570                 case EFI_UNUSABLE_MEMORY:
 571                         res->name = "Unusable Memory";
 572                         break;
 573                 case EFI_ACPI_RECLAIM_MEMORY:
 574                         res->name = "ACPI Reclaim";
 575                         break;
 576                 case EFI_ACPI_MEMORY_NVS:
 577                         res->name = "ACPI NVS";
 578                         break;
 579                 case EFI_MEMORY_MAPPED_IO:
 580                         res->name = "Memory Mapped IO";
 581                         break;
 582                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 583                         res->name = "Memory Mapped IO Port Space";
 584                         break;
 585                 default:
 586                         res->name = "Reserved";
 587                         break;
 588                 }
 589                 res->start = md->phys_addr;
 590                 res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
 591                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 592                 if (request_resource(&iomem_resource, res) < 0)
 593                         printk(KERN_ERR PFX "Failed to allocate res %s : 0x%lx-0x%lx\n",
 594                                 res->name, res->start, res->end);
 595                 /*
 596                  * We don't know which region contains kernel data so we try
 597                  * it repeatedly and let the resource manager test it.
 598                  */
 599                 if (md->type == EFI_CONVENTIONAL_MEMORY) {
 600                         request_resource(res, code_resource);
 601                         request_resource(res, data_resource);
 602 #ifdef CONFIG_KEXEC
 603                         request_resource(res, &crashk_res);
 604 #endif
 605                 }
 606         }
 607 }
 608
 609 /*
 610  * Convenience functions to obtain memory types and attributes
 611  */
 612
 613 u32 efi_mem_type(unsigned long phys_addr)
 614 {
 615         efi_memory_desc_t *md;
 616         void *p;
 617
 618         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 619                 md = p;
 620                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 621                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 622                         return md->type;
 623         }
 624         return 0;
 625 }
 626
 627 u64 efi_mem_attributes(unsigned long phys_addr)
 628 {
 629         efi_memory_desc_t *md;
 630         void *p;
 631
 632         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 633                 md = p;
 634                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 635                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 636                         return md->attribute;
 637         }
 638         return 0;
 639 }