git.oblomov.eu Git - linux-2.6/blob - 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         struct Xgt_desc_struct *cpu_gdt_descr;
  74
  75         spin_lock(&efi_rt_lock);
  76         local_irq_save(efi_rt_eflags);
  77
  78         cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
  79
  80         /*
  81          * If I don't have PSE, I should just duplicate two entries in page
  82          * directory. If I have PSE, I just need to duplicate one entry in
  83          * page directory.
  84          */
  85         cr4 = read_cr4();
  86
  87         if (cr4 & X86_CR4_PSE) {
  88                 efi_bak_pg_dir_pointer[0].pgd =
  89                     swapper_pg_dir[pgd_index(0)].pgd;
  90                 swapper_pg_dir[0].pgd =
  91                     swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
  92         } else {
  93                 efi_bak_pg_dir_pointer[0].pgd =
  94                     swapper_pg_dir[pgd_index(0)].pgd;
  95                 efi_bak_pg_dir_pointer[1].pgd =
  96                     swapper_pg_dir[pgd_index(0x400000)].pgd;
  97                 swapper_pg_dir[pgd_index(0)].pgd =
  98                     swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
  99                 temp = PAGE_OFFSET + 0x400000;
 100                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 101                     swapper_pg_dir[pgd_index(temp)].pgd;
 102         }
 103
 104         /*
 105          * After the lock is released, the original page table is restored.
 106          */
 107         local_flush_tlb();
 108
 109         cpu_gdt_descr->address = __pa(cpu_gdt_descr->address);
 110         load_gdt(cpu_gdt_descr);
 111 }
 112
 113 static void efi_call_phys_epilog(void)
 114 {
 115         unsigned long cr4;
 116         struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
 117
 118         cpu_gdt_descr->address = __va(cpu_gdt_descr->address);
 119         load_gdt(cpu_gdt_descr);
 120
 121         cr4 = read_cr4();
 122
 123         if (cr4 & X86_CR4_PSE) {
 124                 swapper_pg_dir[pgd_index(0)].pgd =
 125                     efi_bak_pg_dir_pointer[0].pgd;
 126         } else {
 127                 swapper_pg_dir[pgd_index(0)].pgd =
 128                     efi_bak_pg_dir_pointer[0].pgd;
 129                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 130                     efi_bak_pg_dir_pointer[1].pgd;
 131         }
 132
 133         /*
 134          * After the lock is released, the original page table is restored.
 135          */
 136         local_flush_tlb();
 137
 138         local_irq_restore(efi_rt_eflags);
 139         spin_unlock(&efi_rt_lock);
 140 }
 141
 142 static efi_status_t
 143 phys_efi_set_virtual_address_map(unsigned long memory_map_size,
 144                                  unsigned long descriptor_size,
 145                                  u32 descriptor_version,
 146                                  efi_memory_desc_t *virtual_map)
 147 {
 148         efi_status_t status;
 149
 150         efi_call_phys_prelog();
 151         status = efi_call_phys(efi_phys.set_virtual_address_map,
 152                                      memory_map_size, descriptor_size,
 153                                      descriptor_version, virtual_map);
 154         efi_call_phys_epilog();
 155         return status;
 156 }
 157
 158 static efi_status_t
 159 phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 160 {
 161         efi_status_t status;
 162
 163         efi_call_phys_prelog();
 164         status = efi_call_phys(efi_phys.get_time, tm, tc);
 165         efi_call_phys_epilog();
 166         return status;
 167 }
 168
 169 inline int efi_set_rtc_mmss(unsigned long nowtime)
 170 {
 171         int real_seconds, real_minutes;
 172         efi_status_t    status;
 173         efi_time_t      eft;
 174         efi_time_cap_t  cap;
 175
 176         spin_lock(&efi_rt_lock);
 177         status = efi.get_time(&eft, &cap);
 178         spin_unlock(&efi_rt_lock);
 179         if (status != EFI_SUCCESS)
 180                 panic("Ooops, efitime: can't read time!\n");
 181         real_seconds = nowtime % 60;
 182         real_minutes = nowtime / 60;
 183
 184         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 185                 real_minutes += 30;
 186         real_minutes %= 60;
 187
 188         eft.minute = real_minutes;
 189         eft.second = real_seconds;
 190
 191         if (status != EFI_SUCCESS) {
 192                 printk("Ooops: efitime: can't read time!\n");
 193                 return -1;
 194         }
 195         return 0;
 196 }
 197 /*
 198  * This should only be used during kernel init and before runtime
 199  * services have been remapped, therefore, we'll need to call in physical
 200  * mode.  Note, this call isn't used later, so mark it __init.
 201  */
 202 inline unsigned long __init efi_get_time(void)
 203 {
 204         efi_status_t status;
 205         efi_time_t eft;
 206         efi_time_cap_t cap;
 207
 208         status = phys_efi_get_time(&eft, &cap);
 209         if (status != EFI_SUCCESS)
 210                 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
 211
 212         return mktime(eft.year, eft.month, eft.day, eft.hour,
 213                         eft.minute, eft.second);
 214 }
 215
 216 int is_available_memory(efi_memory_desc_t * md)
 217 {
 218         if (!(md->attribute & EFI_MEMORY_WB))
 219                 return 0;
 220
 221         switch (md->type) {
 222                 case EFI_LOADER_CODE:
 223                 case EFI_LOADER_DATA:
 224                 case EFI_BOOT_SERVICES_CODE:
 225                 case EFI_BOOT_SERVICES_DATA:
 226                 case EFI_CONVENTIONAL_MEMORY:
 227                         return 1;
 228         }
 229         return 0;
 230 }
 231
 232 /*
 233  * We need to map the EFI memory map again after paging_init().
 234  */
 235 void __init efi_map_memmap(void)
 236 {
 237         memmap.map = NULL;
 238
 239         memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
 240                         (memmap.nr_map * memmap.desc_size));
 241         if (memmap.map == NULL)
 242                 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
 243
 244         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 245 }
 246
 247 #if EFI_DEBUG
 248 static void __init print_efi_memmap(void)
 249 {
 250         efi_memory_desc_t *md;
 251         void *p;
 252         int i;
 253
 254         for (p = memmap.map, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
 255                 md = p;
 256                 printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
 257                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 258                         i, md->type, md->attribute, md->phys_addr,
 259                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 260                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 261         }
 262 }
 263 #endif  /*  EFI_DEBUG  */
 264
 265 /*
 266  * Walks the EFI memory map and calls CALLBACK once for each EFI
 267  * memory descriptor that has memory that is available for kernel use.
 268  */
 269 void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
 270 {
 271         int prev_valid = 0;
 272         struct range {
 273                 unsigned long start;
 274                 unsigned long end;
 275         } prev, curr;
 276         efi_memory_desc_t *md;
 277         unsigned long start, end;
 278         void *p;
 279
 280         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 281                 md = p;
 282
 283                 if ((md->num_pages == 0) || (!is_available_memory(md)))
 284                         continue;
 285
 286                 curr.start = md->phys_addr;
 287                 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 288
 289                 if (!prev_valid) {
 290                         prev = curr;
 291                         prev_valid = 1;
 292                 } else {
 293                         if (curr.start < prev.start)
 294                                 printk(KERN_INFO PFX "Unordered memory map\n");
 295                         if (prev.end == curr.start)
 296                                 prev.end = curr.end;
 297                         else {
 298                                 start =
 299                                     (unsigned long) (PAGE_ALIGN(prev.start));
 300                                 end = (unsigned long) (prev.end & PAGE_MASK);
 301                                 if ((end > start)
 302                                     && (*callback) (start, end, arg) < 0)
 303                                         return;
 304                                 prev = curr;
 305                         }
 306                 }
 307         }
 308         if (prev_valid) {
 309                 start = (unsigned long) PAGE_ALIGN(prev.start);
 310                 end = (unsigned long) (prev.end & PAGE_MASK);
 311                 if (end > start)
 312                         (*callback) (start, end, arg);
 313         }
 314 }
 315
 316 void __init efi_init(void)
 317 {
 318         efi_config_table_t *config_tables;
 319         efi_runtime_services_t *runtime;
 320         efi_char16_t *c16;
 321         char vendor[100] = "unknown";
 322         unsigned long num_config_tables;
 323         int i = 0;
 324
 325         memset(&efi, 0, sizeof(efi) );
 326         memset(&efi_phys, 0, sizeof(efi_phys));
 327
 328         efi_phys.systab = EFI_SYSTAB;
 329         memmap.phys_map = EFI_MEMMAP;
 330         memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
 331         memmap.desc_version = EFI_MEMDESC_VERSION;
 332         memmap.desc_size = EFI_MEMDESC_SIZE;
 333
 334         efi.systab = (efi_system_table_t *)
 335                 boot_ioremap((unsigned long) efi_phys.systab,
 336                         sizeof(efi_system_table_t));
 337         /*
 338          * Verify the EFI Table
 339          */
 340         if (efi.systab == NULL)
 341                 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
 342         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 343                 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
 344         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 345                 printk(KERN_ERR PFX
 346                        "Warning: EFI system table major version mismatch: "
 347                        "got %d.%02d, expected %d.%02d\n",
 348                        efi.systab->hdr.revision >> 16,
 349                        efi.systab->hdr.revision & 0xffff,
 350                        EFI_SYSTEM_TABLE_REVISION >> 16,
 351                        EFI_SYSTEM_TABLE_REVISION & 0xffff);
 352         /*
 353          * Grab some details from the system table
 354          */
 355         num_config_tables = efi.systab->nr_tables;
 356         config_tables = (efi_config_table_t *)efi.systab->tables;
 357         runtime = efi.systab->runtime;
 358
 359         /*
 360          * Show what we know for posterity
 361          */
 362         c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
 363         if (c16) {
 364                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 365                         vendor[i] = *c16++;
 366                 vendor[i] = '\0';
 367         } else
 368                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 369
 370         printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n",
 371                efi.systab->hdr.revision >> 16,
 372                efi.systab->hdr.revision & 0xffff, vendor);
 373
 374         /*
 375          * Let's see what config tables the firmware passed to us.
 376          */
 377         config_tables = (efi_config_table_t *)
 378                                 boot_ioremap((unsigned long) config_tables,
 379                                 num_config_tables * sizeof(efi_config_table_t));
 380
 381         if (config_tables == NULL)
 382                 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
 383
 384         for (i = 0; i < num_config_tables; i++) {
 385                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 386                         efi.mps = (void *)config_tables[i].table;
 387                         printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
 388                 } else
 389                     if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 390                         efi.acpi20 = __va(config_tables[i].table);
 391                         printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
 392                 } else
 393                     if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 394                         efi.acpi = __va(config_tables[i].table);
 395                         printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
 396                 } else
 397                     if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 398                         efi.smbios = (void *) config_tables[i].table;
 399                         printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
 400                 } else
 401                     if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 402                         efi.hcdp = (void *)config_tables[i].table;
 403                         printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
 404                 } else
 405                     if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
 406                         efi.uga = (void *)config_tables[i].table;
 407                         printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
 408                 }
 409         }
 410         printk("\n");
 411
 412         /*
 413          * Check out the runtime services table. We need to map
 414          * the runtime services table so that we can grab the physical
 415          * address of several of the EFI runtime functions, needed to
 416          * set the firmware into virtual mode.
 417          */
 418
 419         runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
 420                                                 runtime,
 421                                                 sizeof(efi_runtime_services_t));
 422         if (runtime != NULL) {
 423                 /*
 424                  * We will only need *early* access to the following
 425                  * two EFI runtime services before set_virtual_address_map
 426                  * is invoked.
 427                  */
 428                 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
 429                 efi_phys.set_virtual_address_map =
 430                         (efi_set_virtual_address_map_t *)
 431                                 runtime->set_virtual_address_map;
 432         } else
 433                 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
 434
 435         /* Map the EFI memory map for use until paging_init() */
 436         memmap.map = boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
 437         if (memmap.map == NULL)
 438                 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
 439
 440         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 441
 442 #if EFI_DEBUG
 443         print_efi_memmap();
 444 #endif
 445 }
 446
 447 static inline void __init check_range_for_systab(efi_memory_desc_t *md)
 448 {
 449         if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) &&
 450                 ((unsigned long)efi_phys.systab < md->phys_addr +
 451                 ((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) {
 452                 unsigned long addr;
 453
 454                 addr = md->virt_addr - md->phys_addr +
 455                         (unsigned long)efi_phys.systab;
 456                 efi.systab = (efi_system_table_t *)addr;
 457         }
 458 }
 459
 460 /*
 461  * This function will switch the EFI runtime services to virtual mode.
 462  * Essentially, look through the EFI memmap and map every region that
 463  * has the runtime attribute bit set in its memory descriptor and update
 464  * that memory descriptor with the virtual address obtained from ioremap().
 465  * This enables the runtime services to be called without having to
 466  * thunk back into physical mode for every invocation.
 467  */
 468
 469 void __init efi_enter_virtual_mode(void)
 470 {
 471         efi_memory_desc_t *md;
 472         efi_status_t status;
 473         void *p;
 474
 475         efi.systab = NULL;
 476
 477         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 478                 md = p;
 479
 480                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 481                         continue;
 482
 483                 md->virt_addr = (unsigned long)ioremap(md->phys_addr,
 484                         md->num_pages << EFI_PAGE_SHIFT);
 485                 if (!(unsigned long)md->virt_addr) {
 486                         printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
 487                                 (unsigned long)md->phys_addr);
 488                 }
 489                 /* update the virtual address of the EFI system table */
 490                 check_range_for_systab(md);
 491         }
 492
 493         if (!efi.systab)
 494                 BUG();
 495
 496         status = phys_efi_set_virtual_address_map(
 497                         memmap.desc_size * memmap.nr_map,
 498                         memmap.desc_size,
 499                         memmap.desc_version,
 500                         memmap.phys_map);
 501
 502         if (status != EFI_SUCCESS) {
 503                 printk (KERN_ALERT "You are screwed! "
 504                         "Unable to switch EFI into virtual mode "
 505                         "(status=%lx)\n", status);
 506                 panic("EFI call to SetVirtualAddressMap() failed!");
 507         }
 508
 509         /*
 510          * Now that EFI is in virtual mode, update the function
 511          * pointers in the runtime service table to the new virtual addresses.
 512          */
 513
 514         efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
 515         efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
 516         efi.get_wakeup_time = (efi_get_wakeup_time_t *)
 517                                         efi.systab->runtime->get_wakeup_time;
 518         efi.set_wakeup_time = (efi_set_wakeup_time_t *)
 519                                         efi.systab->runtime->set_wakeup_time;
 520         efi.get_variable = (efi_get_variable_t *)
 521                                         efi.systab->runtime->get_variable;
 522         efi.get_next_variable = (efi_get_next_variable_t *)
 523                                         efi.systab->runtime->get_next_variable;
 524         efi.set_variable = (efi_set_variable_t *)
 525                                         efi.systab->runtime->set_variable;
 526         efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
 527                                         efi.systab->runtime->get_next_high_mono_count;
 528         efi.reset_system = (efi_reset_system_t *)
 529                                         efi.systab->runtime->reset_system;
 530 }
 531
 532 void __init
 533 efi_initialize_iomem_resources(struct resource *code_resource,
 534                                struct resource *data_resource)
 535 {
 536         struct resource *res;
 537         efi_memory_desc_t *md;
 538         void *p;
 539
 540         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 541                 md = p;
 542
 543                 if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
 544                     0x100000000ULL)
 545                         continue;
 546                 res = alloc_bootmem_low(sizeof(struct resource));
 547                 switch (md->type) {
 548                 case EFI_RESERVED_TYPE:
 549                         res->name = "Reserved Memory";
 550                         break;
 551                 case EFI_LOADER_CODE:
 552                         res->name = "Loader Code";
 553                         break;
 554                 case EFI_LOADER_DATA:
 555                         res->name = "Loader Data";
 556                         break;
 557                 case EFI_BOOT_SERVICES_DATA:
 558                         res->name = "BootServices Data";
 559                         break;
 560                 case EFI_BOOT_SERVICES_CODE:
 561                         res->name = "BootServices Code";
 562                         break;
 563                 case EFI_RUNTIME_SERVICES_CODE:
 564                         res->name = "Runtime Service Code";
 565                         break;
 566                 case EFI_RUNTIME_SERVICES_DATA:
 567                         res->name = "Runtime Service Data";
 568                         break;
 569                 case EFI_CONVENTIONAL_MEMORY:
 570                         res->name = "Conventional Memory";
 571                         break;
 572                 case EFI_UNUSABLE_MEMORY:
 573                         res->name = "Unusable Memory";
 574                         break;
 575                 case EFI_ACPI_RECLAIM_MEMORY:
 576                         res->name = "ACPI Reclaim";
 577                         break;
 578                 case EFI_ACPI_MEMORY_NVS:
 579                         res->name = "ACPI NVS";
 580                         break;
 581                 case EFI_MEMORY_MAPPED_IO:
 582                         res->name = "Memory Mapped IO";
 583                         break;
 584                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 585                         res->name = "Memory Mapped IO Port Space";
 586                         break;
 587                 default:
 588                         res->name = "Reserved";
 589                         break;
 590                 }
 591                 res->start = md->phys_addr;
 592                 res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
 593                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 594                 if (request_resource(&iomem_resource, res) < 0)
 595                         printk(KERN_ERR PFX "Failed to allocate res %s : 0x%lx-0x%lx\n",
 596                                 res->name, res->start, res->end);
 597                 /*
 598                  * We don't know which region contains kernel data so we try
 599                  * it repeatedly and let the resource manager test it.
 600                  */
 601                 if (md->type == EFI_CONVENTIONAL_MEMORY) {
 602                         request_resource(res, code_resource);
 603                         request_resource(res, data_resource);
 604 #ifdef CONFIG_KEXEC
 605                         request_resource(res, &crashk_res);
 606 #endif
 607                 }
 608         }
 609 }
 610
 611 /*
 612  * Convenience functions to obtain memory types and attributes
 613  */
 614
 615 u32 efi_mem_type(unsigned long phys_addr)
 616 {
 617         efi_memory_desc_t *md;
 618         void *p;
 619
 620         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 621                 md = p;
 622                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 623                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 624                         return md->type;
 625         }
 626         return 0;
 627 }
 628
 629 u64 efi_mem_attributes(unsigned long phys_addr)
 630 {
 631         efi_memory_desc_t *md;
 632         void *p;
 633
 634         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 635                 md = p;
 636                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 637                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 638                         return md->attribute;
 639         }
 640         return 0;
 641 }