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
  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         __asm__ __volatile__("movl %%cr4, %0":"=r"(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         __asm__ __volatile__("lgdt %0":"=m"
 108                             (*(struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0])));
 109 }
 110
 111 static void efi_call_phys_epilog(void)
 112 {
 113         unsigned long cr4;
 114
 115         cpu_gdt_descr[0].address =
 116                 (unsigned long) __va(cpu_gdt_descr[0].address);
 117         __asm__ __volatile__("lgdt %0":"=m"(cpu_gdt_descr));
 118         __asm__ __volatile__("movl %%cr4, %0":"=r"(cr4));
 119
 120         if (cr4 & X86_CR4_PSE) {
 121                 swapper_pg_dir[pgd_index(0)].pgd =
 122                     efi_bak_pg_dir_pointer[0].pgd;
 123         } else {
 124                 swapper_pg_dir[pgd_index(0)].pgd =
 125                     efi_bak_pg_dir_pointer[0].pgd;
 126                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 127                     efi_bak_pg_dir_pointer[1].pgd;
 128         }
 129
 130         /*
 131          * After the lock is released, the original page table is restored.
 132          */
 133         local_flush_tlb();
 134
 135         local_irq_restore(efi_rt_eflags);
 136         spin_unlock(&efi_rt_lock);
 137 }
 138
 139 static efi_status_t
 140 phys_efi_set_virtual_address_map(unsigned long memory_map_size,
 141                                  unsigned long descriptor_size,
 142                                  u32 descriptor_version,
 143                                  efi_memory_desc_t *virtual_map)
 144 {
 145         efi_status_t status;
 146
 147         efi_call_phys_prelog();
 148         status = efi_call_phys(efi_phys.set_virtual_address_map,
 149                                      memory_map_size, descriptor_size,
 150                                      descriptor_version, virtual_map);
 151         efi_call_phys_epilog();
 152         return status;
 153 }
 154
 155 static efi_status_t
 156 phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 157 {
 158         efi_status_t status;
 159
 160         efi_call_phys_prelog();
 161         status = efi_call_phys(efi_phys.get_time, tm, tc);
 162         efi_call_phys_epilog();
 163         return status;
 164 }
 165
 166 inline int efi_set_rtc_mmss(unsigned long nowtime)
 167 {
 168         int real_seconds, real_minutes;
 169         efi_status_t    status;
 170         efi_time_t      eft;
 171         efi_time_cap_t  cap;
 172
 173         spin_lock(&efi_rt_lock);
 174         status = efi.get_time(&eft, &cap);
 175         spin_unlock(&efi_rt_lock);
 176         if (status != EFI_SUCCESS)
 177                 panic("Ooops, efitime: can't read time!\n");
 178         real_seconds = nowtime % 60;
 179         real_minutes = nowtime / 60;
 180
 181         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 182                 real_minutes += 30;
 183         real_minutes %= 60;
 184
 185         eft.minute = real_minutes;
 186         eft.second = real_seconds;
 187
 188         if (status != EFI_SUCCESS) {
 189                 printk("Ooops: efitime: can't read time!\n");
 190                 return -1;
 191         }
 192         return 0;
 193 }
 194 /*
 195  * This should only be used during kernel init and before runtime
 196  * services have been remapped, therefore, we'll need to call in physical
 197  * mode.  Note, this call isn't used later, so mark it __init.
 198  */
 199 inline unsigned long __init efi_get_time(void)
 200 {
 201         efi_status_t status;
 202         efi_time_t eft;
 203         efi_time_cap_t cap;
 204
 205         status = phys_efi_get_time(&eft, &cap);
 206         if (status != EFI_SUCCESS)
 207                 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
 208
 209         return mktime(eft.year, eft.month, eft.day, eft.hour,
 210                         eft.minute, eft.second);
 211 }
 212
 213 int is_available_memory(efi_memory_desc_t * md)
 214 {
 215         if (!(md->attribute & EFI_MEMORY_WB))
 216                 return 0;
 217
 218         switch (md->type) {
 219                 case EFI_LOADER_CODE:
 220                 case EFI_LOADER_DATA:
 221                 case EFI_BOOT_SERVICES_CODE:
 222                 case EFI_BOOT_SERVICES_DATA:
 223                 case EFI_CONVENTIONAL_MEMORY:
 224                         return 1;
 225         }
 226         return 0;
 227 }
 228
 229 /*
 230  * We need to map the EFI memory map again after paging_init().
 231  */
 232 void __init efi_map_memmap(void)
 233 {
 234         memmap.map = NULL;
 235
 236         memmap.map = (efi_memory_desc_t *)
 237                 bt_ioremap((unsigned long) memmap.phys_map,
 238                         (memmap.nr_map * sizeof(efi_memory_desc_t)));
 239
 240         if (memmap.map == NULL)
 241                 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
 242 }
 243
 244 #if EFI_DEBUG
 245 static void __init print_efi_memmap(void)
 246 {
 247         efi_memory_desc_t *md;
 248         int i;
 249
 250         for (i = 0; i < memmap.nr_map; i++) {
 251                 md = &memmap.map[i];
 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         int i;
 275
 276         for (i = 0; i < memmap.nr_map; i++) {
 277                 md = &memmap.map[i];
 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
 329         efi.systab = (efi_system_table_t *)
 330                 boot_ioremap((unsigned long) efi_phys.systab,
 331                         sizeof(efi_system_table_t));
 332         /*
 333          * Verify the EFI Table
 334          */
 335         if (efi.systab == NULL)
 336                 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
 337         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 338                 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
 339         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 340                 printk(KERN_ERR PFX
 341                        "Warning: EFI system table major version mismatch: "
 342                        "got %d.%02d, expected %d.%02d\n",
 343                        efi.systab->hdr.revision >> 16,
 344                        efi.systab->hdr.revision & 0xffff,
 345                        EFI_SYSTEM_TABLE_REVISION >> 16,
 346                        EFI_SYSTEM_TABLE_REVISION & 0xffff);
 347         /*
 348          * Grab some details from the system table
 349          */
 350         num_config_tables = efi.systab->nr_tables;
 351         config_tables = (efi_config_table_t *)efi.systab->tables;
 352         runtime = efi.systab->runtime;
 353
 354         /*
 355          * Show what we know for posterity
 356          */
 357         c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
 358         if (c16) {
 359                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 360                         vendor[i] = *c16++;
 361                 vendor[i] = '\0';
 362         } else
 363                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 364
 365         printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n",
 366                efi.systab->hdr.revision >> 16,
 367                efi.systab->hdr.revision & 0xffff, vendor);
 368
 369         /*
 370          * Let's see what config tables the firmware passed to us.
 371          */
 372         config_tables = (efi_config_table_t *)
 373                                 boot_ioremap((unsigned long) config_tables,
 374                                 num_config_tables * sizeof(efi_config_table_t));
 375
 376         if (config_tables == NULL)
 377                 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
 378
 379         for (i = 0; i < num_config_tables; i++) {
 380                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 381                         efi.mps = (void *)config_tables[i].table;
 382                         printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
 383                 } else
 384                     if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 385                         efi.acpi20 = __va(config_tables[i].table);
 386                         printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
 387                 } else
 388                     if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 389                         efi.acpi = __va(config_tables[i].table);
 390                         printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
 391                 } else
 392                     if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 393                         efi.smbios = (void *) config_tables[i].table;
 394                         printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
 395                 } else
 396                     if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 397                         efi.hcdp = (void *)config_tables[i].table;
 398                         printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
 399                 } else
 400                     if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
 401                         efi.uga = (void *)config_tables[i].table;
 402                         printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
 403                 }
 404         }
 405         printk("\n");
 406
 407         /*
 408          * Check out the runtime services table. We need to map
 409          * the runtime services table so that we can grab the physical
 410          * address of several of the EFI runtime functions, needed to
 411          * set the firmware into virtual mode.
 412          */
 413
 414         runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
 415                                                 runtime,
 416                                                 sizeof(efi_runtime_services_t));
 417         if (runtime != NULL) {
 418                 /*
 419                  * We will only need *early* access to the following
 420                  * two EFI runtime services before set_virtual_address_map
 421                  * is invoked.
 422                  */
 423                 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
 424                 efi_phys.set_virtual_address_map =
 425                         (efi_set_virtual_address_map_t *)
 426                                 runtime->set_virtual_address_map;
 427         } else
 428                 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
 429
 430         /* Map the EFI memory map for use until paging_init() */
 431
 432         memmap.map = (efi_memory_desc_t *)
 433                 boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
 434
 435         if (memmap.map == NULL)
 436                 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
 437
 438         if (EFI_MEMDESC_SIZE != sizeof(efi_memory_desc_t)) {
 439                 printk(KERN_WARNING PFX "Warning! Kernel-defined memdesc doesn't "
 440                            "match the one from EFI!\n");
 441         }
 442 #if EFI_DEBUG
 443         print_efi_memmap();
 444 #endif
 445 }
 446
 447 /*
 448  * This function will switch the EFI runtime services to virtual mode.
 449  * Essentially, look through the EFI memmap and map every region that
 450  * has the runtime attribute bit set in its memory descriptor and update
 451  * that memory descriptor with the virtual address obtained from ioremap().
 452  * This enables the runtime services to be called without having to
 453  * thunk back into physical mode for every invocation.
 454  */
 455
 456 void __init efi_enter_virtual_mode(void)
 457 {
 458         efi_memory_desc_t *md;
 459         efi_status_t status;
 460         int i;
 461
 462         efi.systab = NULL;
 463
 464         for (i = 0; i < memmap.nr_map; i++) {
 465                 md = &memmap.map[i];
 466
 467                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 468                         md->virt_addr =
 469                                 (unsigned long)ioremap(md->phys_addr,
 470                                         md->num_pages << EFI_PAGE_SHIFT);
 471                         if (!(unsigned long)md->virt_addr) {
 472                                 printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
 473                                         (unsigned long)md->phys_addr);
 474                         }
 475
 476                         if (((unsigned long)md->phys_addr <=
 477                                         (unsigned long)efi_phys.systab) &&
 478                                 ((unsigned long)efi_phys.systab <
 479                                         md->phys_addr +
 480                                         ((unsigned long)md->num_pages <<
 481                                                 EFI_PAGE_SHIFT))) {
 482                                 unsigned long addr;
 483
 484                                 addr = md->virt_addr - md->phys_addr +
 485                                                 (unsigned long)efi_phys.systab;
 486                                 efi.systab = (efi_system_table_t *)addr;
 487                         }
 488                 }
 489         }
 490
 491         if (!efi.systab)
 492                 BUG();
 493
 494         status = phys_efi_set_virtual_address_map(
 495                         sizeof(efi_memory_desc_t) * memmap.nr_map,
 496                         sizeof(efi_memory_desc_t),
 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         int i;
 537
 538         for (i = 0; i < memmap.nr_map; i++) {
 539                 md = &memmap.map[i];
 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         int i;
 617
 618         for (i = 0; i < memmap.nr_map; i++) {
 619                 md = &memmap.map[i];
 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         int i;
 631
 632         for (i = 0; i < memmap.nr_map; i++) {
 633                 md = &memmap.map[i];
 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 }