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/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/mm.h>
  25 #include <linux/types.h>
  26 #include <linux/time.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/bootmem.h>
  29 #include <linux/ioport.h>
  30 #include <linux/module.h>
  31 #include <linux/efi.h>
  32 #include <linux/kexec.h>
  33
  34 #include <asm/setup.h>
  35 #include <asm/io.h>
  36 #include <asm/page.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/processor.h>
  39 #include <asm/desc.h>
  40 #include <asm/tlbflush.h>
  41
  42 #define EFI_DEBUG       0
  43 #define PFX             "EFI: "
  44
  45 extern efi_status_t asmlinkage efi_call_phys(void *, ...);
  46
  47 struct efi efi;
  48 EXPORT_SYMBOL(efi);
  49 static struct efi efi_phys;
  50 struct efi_memory_map memmap;
  51
  52 /*
  53  * We require an early boot_ioremap mapping mechanism initially
  54  */
  55 extern void * boot_ioremap(unsigned long, unsigned long);
  56
  57 /*
  58  * To make EFI call EFI runtime service in physical addressing mode we need
  59  * prelog/epilog before/after the invocation to disable interrupt, to
  60  * claim EFI runtime service handler exclusively and to duplicate a memory in
  61  * low memory space say 0 - 3G.
  62  */
  63
  64 static unsigned long efi_rt_eflags;
  65 static DEFINE_SPINLOCK(efi_rt_lock);
  66 static pgd_t efi_bak_pg_dir_pointer[2];
  67
  68 static void efi_call_phys_prelog(void) __acquires(efi_rt_lock)
  69 {
  70         unsigned long cr4;
  71         unsigned long temp;
  72         struct Xgt_desc_struct *cpu_gdt_descr;
  73
  74         spin_lock(&efi_rt_lock);
  75         local_irq_save(efi_rt_eflags);
  76
  77         cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
  78
  79         /*
  80          * If I don't have PSE, I should just duplicate two entries in page
  81          * directory. If I have PSE, I just need to duplicate one entry in
  82          * page directory.
  83          */
  84         cr4 = read_cr4();
  85
  86         if (cr4 & X86_CR4_PSE) {
  87                 efi_bak_pg_dir_pointer[0].pgd =
  88                     swapper_pg_dir[pgd_index(0)].pgd;
  89                 swapper_pg_dir[0].pgd =
  90                     swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
  91         } else {
  92                 efi_bak_pg_dir_pointer[0].pgd =
  93                     swapper_pg_dir[pgd_index(0)].pgd;
  94                 efi_bak_pg_dir_pointer[1].pgd =
  95                     swapper_pg_dir[pgd_index(0x400000)].pgd;
  96                 swapper_pg_dir[pgd_index(0)].pgd =
  97                     swapper_pg_dir[pgd_index(PAGE_OFFSET)].pgd;
  98                 temp = PAGE_OFFSET + 0x400000;
  99                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 100                     swapper_pg_dir[pgd_index(temp)].pgd;
 101         }
 102
 103         /*
 104          * After the lock is released, the original page table is restored.
 105          */
 106         local_flush_tlb();
 107
 108         cpu_gdt_descr->address = __pa(cpu_gdt_descr->address);
 109         load_gdt(cpu_gdt_descr);
 110 }
 111
 112 static void efi_call_phys_epilog(void) __releases(efi_rt_lock)
 113 {
 114         unsigned long cr4;
 115         struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, 0);
 116
 117         cpu_gdt_descr->address = (unsigned long)__va(cpu_gdt_descr->address);
 118         load_gdt(cpu_gdt_descr);
 119
 120         cr4 = read_cr4();
 121
 122         if (cr4 & X86_CR4_PSE) {
 123                 swapper_pg_dir[pgd_index(0)].pgd =
 124                     efi_bak_pg_dir_pointer[0].pgd;
 125         } else {
 126                 swapper_pg_dir[pgd_index(0)].pgd =
 127                     efi_bak_pg_dir_pointer[0].pgd;
 128                 swapper_pg_dir[pgd_index(0x400000)].pgd =
 129                     efi_bak_pg_dir_pointer[1].pgd;
 130         }
 131
 132         /*
 133          * After the lock is released, the original page table is restored.
 134          */
 135         local_flush_tlb();
 136
 137         local_irq_restore(efi_rt_eflags);
 138         spin_unlock(&efi_rt_lock);
 139 }
 140
 141 static efi_status_t
 142 phys_efi_set_virtual_address_map(unsigned long memory_map_size,
 143                                  unsigned long descriptor_size,
 144                                  u32 descriptor_version,
 145                                  efi_memory_desc_t *virtual_map)
 146 {
 147         efi_status_t status;
 148
 149         efi_call_phys_prelog();
 150         status = efi_call_phys(efi_phys.set_virtual_address_map,
 151                                      memory_map_size, descriptor_size,
 152                                      descriptor_version, virtual_map);
 153         efi_call_phys_epilog();
 154         return status;
 155 }
 156
 157 static efi_status_t
 158 phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 159 {
 160         efi_status_t status;
 161
 162         efi_call_phys_prelog();
 163         status = efi_call_phys(efi_phys.get_time, tm, tc);
 164         efi_call_phys_epilog();
 165         return status;
 166 }
 167
 168 inline int efi_set_rtc_mmss(unsigned long nowtime)
 169 {
 170         int real_seconds, real_minutes;
 171         efi_status_t    status;
 172         efi_time_t      eft;
 173         efi_time_cap_t  cap;
 174
 175         spin_lock(&efi_rt_lock);
 176         status = efi.get_time(&eft, &cap);
 177         spin_unlock(&efi_rt_lock);
 178         if (status != EFI_SUCCESS)
 179                 panic("Ooops, efitime: can't read time!\n");
 180         real_seconds = nowtime % 60;
 181         real_minutes = nowtime / 60;
 182
 183         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 184                 real_minutes += 30;
 185         real_minutes %= 60;
 186
 187         eft.minute = real_minutes;
 188         eft.second = real_seconds;
 189
 190         if (status != EFI_SUCCESS) {
 191                 printk("Ooops: efitime: can't read time!\n");
 192                 return -1;
 193         }
 194         return 0;
 195 }
 196 /*
 197  * This is used during kernel init before runtime
 198  * services have been remapped and also during suspend, therefore,
 199  * we'll need to call both in physical and virtual modes.
 200  */
 201 inline unsigned long efi_get_time(void)
 202 {
 203         efi_status_t status;
 204         efi_time_t eft;
 205         efi_time_cap_t cap;
 206
 207         if (efi.get_time) {
 208                 /* if we are in virtual mode use remapped function */
 209                 status = efi.get_time(&eft, &cap);
 210         } else {
 211                 /* we are in physical mode */
 212                 status = phys_efi_get_time(&eft, &cap);
 213         }
 214
 215         if (status != EFI_SUCCESS)
 216                 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
 217
 218         return mktime(eft.year, eft.month, eft.day, eft.hour,
 219                         eft.minute, eft.second);
 220 }
 221
 222 int is_available_memory(efi_memory_desc_t * md)
 223 {
 224         if (!(md->attribute & EFI_MEMORY_WB))
 225                 return 0;
 226
 227         switch (md->type) {
 228                 case EFI_LOADER_CODE:
 229                 case EFI_LOADER_DATA:
 230                 case EFI_BOOT_SERVICES_CODE:
 231                 case EFI_BOOT_SERVICES_DATA:
 232                 case EFI_CONVENTIONAL_MEMORY:
 233                         return 1;
 234         }
 235         return 0;
 236 }
 237
 238 /*
 239  * We need to map the EFI memory map again after paging_init().
 240  */
 241 void __init efi_map_memmap(void)
 242 {
 243         memmap.map = NULL;
 244
 245         memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
 246                         (memmap.nr_map * memmap.desc_size));
 247         if (memmap.map == NULL)
 248                 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
 249
 250         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 251 }
 252
 253 #if EFI_DEBUG
 254 static void __init print_efi_memmap(void)
 255 {
 256         efi_memory_desc_t *md;
 257         void *p;
 258         int i;
 259
 260         for (p = memmap.map, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
 261                 md = p;
 262                 printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
 263                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 264                         i, md->type, md->attribute, md->phys_addr,
 265                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 266                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 267         }
 268 }
 269 #endif  /*  EFI_DEBUG  */
 270
 271 /*
 272  * Walks the EFI memory map and calls CALLBACK once for each EFI
 273  * memory descriptor that has memory that is available for kernel use.
 274  */
 275 void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
 276 {
 277         int prev_valid = 0;
 278         struct range {
 279                 unsigned long start;
 280                 unsigned long end;
 281         } prev, curr;
 282         efi_memory_desc_t *md;
 283         unsigned long start, end;
 284         void *p;
 285
 286         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 287                 md = p;
 288
 289                 if ((md->num_pages == 0) || (!is_available_memory(md)))
 290                         continue;
 291
 292                 curr.start = md->phys_addr;
 293                 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 294
 295                 if (!prev_valid) {
 296                         prev = curr;
 297                         prev_valid = 1;
 298                 } else {
 299                         if (curr.start < prev.start)
 300                                 printk(KERN_INFO PFX "Unordered memory map\n");
 301                         if (prev.end == curr.start)
 302                                 prev.end = curr.end;
 303                         else {
 304                                 start =
 305                                     (unsigned long) (PAGE_ALIGN(prev.start));
 306                                 end = (unsigned long) (prev.end & PAGE_MASK);
 307                                 if ((end > start)
 308                                     && (*callback) (start, end, arg) < 0)
 309                                         return;
 310                                 prev = curr;
 311                         }
 312                 }
 313         }
 314         if (prev_valid) {
 315                 start = (unsigned long) PAGE_ALIGN(prev.start);
 316                 end = (unsigned long) (prev.end & PAGE_MASK);
 317                 if (end > start)
 318                         (*callback) (start, end, arg);
 319         }
 320 }
 321
 322 void __init efi_init(void)
 323 {
 324         efi_config_table_t *config_tables;
 325         efi_runtime_services_t *runtime;
 326         efi_char16_t *c16;
 327         char vendor[100] = "unknown";
 328         unsigned long num_config_tables;
 329         int i = 0;
 330
 331         memset(&efi, 0, sizeof(efi) );
 332         memset(&efi_phys, 0, sizeof(efi_phys));
 333
 334         efi_phys.systab = EFI_SYSTAB;
 335         memmap.phys_map = EFI_MEMMAP;
 336         memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
 337         memmap.desc_version = EFI_MEMDESC_VERSION;
 338         memmap.desc_size = EFI_MEMDESC_SIZE;
 339
 340         efi.systab = (efi_system_table_t *)
 341                 boot_ioremap((unsigned long) efi_phys.systab,
 342                         sizeof(efi_system_table_t));
 343         /*
 344          * Verify the EFI Table
 345          */
 346         if (efi.systab == NULL)
 347                 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
 348         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 349                 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
 350         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 351                 printk(KERN_ERR PFX
 352                        "Warning: EFI system table major version mismatch: "
 353                        "got %d.%02d, expected %d.%02d\n",
 354                        efi.systab->hdr.revision >> 16,
 355                        efi.systab->hdr.revision & 0xffff,
 356                        EFI_SYSTEM_TABLE_REVISION >> 16,
 357                        EFI_SYSTEM_TABLE_REVISION & 0xffff);
 358         /*
 359          * Grab some details from the system table
 360          */
 361         num_config_tables = efi.systab->nr_tables;
 362         config_tables = (efi_config_table_t *)efi.systab->tables;
 363         runtime = efi.systab->runtime;
 364
 365         /*
 366          * Show what we know for posterity
 367          */
 368         c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
 369         if (c16) {
 370                 for (i = 0; i < (sizeof(vendor) - 1) && *c16; ++i)
 371                         vendor[i] = *c16++;
 372                 vendor[i] = '\0';
 373         } else
 374                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 375
 376         printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n",
 377                efi.systab->hdr.revision >> 16,
 378                efi.systab->hdr.revision & 0xffff, vendor);
 379
 380         /*
 381          * Let's see what config tables the firmware passed to us.
 382          */
 383         config_tables = (efi_config_table_t *)
 384                                 boot_ioremap((unsigned long) config_tables,
 385                                 num_config_tables * sizeof(efi_config_table_t));
 386
 387         if (config_tables == NULL)
 388                 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
 389
 390         efi.mps        = EFI_INVALID_TABLE_ADDR;
 391         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 392         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 393         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 394         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 395         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 396         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 397         efi.uga        = EFI_INVALID_TABLE_ADDR;
 398
 399         for (i = 0; i < num_config_tables; i++) {
 400                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 401                         efi.mps = config_tables[i].table;
 402                         printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
 403                 } else
 404                     if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 405                         efi.acpi20 = config_tables[i].table;
 406                         printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
 407                 } else
 408                     if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 409                         efi.acpi = config_tables[i].table;
 410                         printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
 411                 } else
 412                     if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 413                         efi.smbios = config_tables[i].table;
 414                         printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
 415                 } else
 416                     if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 417                         efi.hcdp = config_tables[i].table;
 418                         printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
 419                 } else
 420                     if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
 421                         efi.uga = config_tables[i].table;
 422                         printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
 423                 }
 424         }
 425         printk("\n");
 426
 427         /*
 428          * Check out the runtime services table. We need to map
 429          * the runtime services table so that we can grab the physical
 430          * address of several of the EFI runtime functions, needed to
 431          * set the firmware into virtual mode.
 432          */
 433
 434         runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
 435                                                 runtime,
 436                                                 sizeof(efi_runtime_services_t));
 437         if (runtime != NULL) {
 438                 /*
 439                  * We will only need *early* access to the following
 440                  * two EFI runtime services before set_virtual_address_map
 441                  * is invoked.
 442                  */
 443                 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
 444                 efi_phys.set_virtual_address_map =
 445                         (efi_set_virtual_address_map_t *)
 446                                 runtime->set_virtual_address_map;
 447         } else
 448                 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
 449
 450         /* Map the EFI memory map for use until paging_init() */
 451         memmap.map = boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
 452         if (memmap.map == NULL)
 453                 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
 454
 455         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 456
 457 #if EFI_DEBUG
 458         print_efi_memmap();
 459 #endif
 460 }
 461
 462 static inline void __init check_range_for_systab(efi_memory_desc_t *md)
 463 {
 464         if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) &&
 465                 ((unsigned long)efi_phys.systab < md->phys_addr +
 466                 ((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) {
 467                 unsigned long addr;
 468
 469                 addr = md->virt_addr - md->phys_addr +
 470                         (unsigned long)efi_phys.systab;
 471                 efi.systab = (efi_system_table_t *)addr;
 472         }
 473 }
 474
 475 /*
 476  * This function will switch the EFI runtime services to virtual mode.
 477  * Essentially, look through the EFI memmap and map every region that
 478  * has the runtime attribute bit set in its memory descriptor and update
 479  * that memory descriptor with the virtual address obtained from ioremap().
 480  * This enables the runtime services to be called without having to
 481  * thunk back into physical mode for every invocation.
 482  */
 483
 484 void __init efi_enter_virtual_mode(void)
 485 {
 486         efi_memory_desc_t *md;
 487         efi_status_t status;
 488         void *p;
 489
 490         efi.systab = NULL;
 491
 492         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 493                 md = p;
 494
 495                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 496                         continue;
 497
 498                 md->virt_addr = (unsigned long)ioremap(md->phys_addr,
 499                         md->num_pages << EFI_PAGE_SHIFT);
 500                 if (!(unsigned long)md->virt_addr) {
 501                         printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
 502                                 (unsigned long)md->phys_addr);
 503                 }
 504                 /* update the virtual address of the EFI system table */
 505                 check_range_for_systab(md);
 506         }
 507
 508         BUG_ON(!efi.systab);
 509
 510         status = phys_efi_set_virtual_address_map(
 511                         memmap.desc_size * memmap.nr_map,
 512                         memmap.desc_size,
 513                         memmap.desc_version,
 514                         memmap.phys_map);
 515
 516         if (status != EFI_SUCCESS) {
 517                 printk (KERN_ALERT "You are screwed! "
 518                         "Unable to switch EFI into virtual mode "
 519                         "(status=%lx)\n", status);
 520                 panic("EFI call to SetVirtualAddressMap() failed!");
 521         }
 522
 523         /*
 524          * Now that EFI is in virtual mode, update the function
 525          * pointers in the runtime service table to the new virtual addresses.
 526          */
 527
 528         efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
 529         efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
 530         efi.get_wakeup_time = (efi_get_wakeup_time_t *)
 531                                         efi.systab->runtime->get_wakeup_time;
 532         efi.set_wakeup_time = (efi_set_wakeup_time_t *)
 533                                         efi.systab->runtime->set_wakeup_time;
 534         efi.get_variable = (efi_get_variable_t *)
 535                                         efi.systab->runtime->get_variable;
 536         efi.get_next_variable = (efi_get_next_variable_t *)
 537                                         efi.systab->runtime->get_next_variable;
 538         efi.set_variable = (efi_set_variable_t *)
 539                                         efi.systab->runtime->set_variable;
 540         efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
 541                                         efi.systab->runtime->get_next_high_mono_count;
 542         efi.reset_system = (efi_reset_system_t *)
 543                                         efi.systab->runtime->reset_system;
 544 }
 545
 546 void __init
 547 efi_initialize_iomem_resources(struct resource *code_resource,
 548                                struct resource *data_resource)
 549 {
 550         struct resource *res;
 551         efi_memory_desc_t *md;
 552         void *p;
 553
 554         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 555                 md = p;
 556
 557                 if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
 558                     0x100000000ULL)
 559                         continue;
 560                 res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
 561                 switch (md->type) {
 562                 case EFI_RESERVED_TYPE:
 563                         res->name = "Reserved Memory";
 564                         break;
 565                 case EFI_LOADER_CODE:
 566                         res->name = "Loader Code";
 567                         break;
 568                 case EFI_LOADER_DATA:
 569                         res->name = "Loader Data";
 570                         break;
 571                 case EFI_BOOT_SERVICES_DATA:
 572                         res->name = "BootServices Data";
 573                         break;
 574                 case EFI_BOOT_SERVICES_CODE:
 575                         res->name = "BootServices Code";
 576                         break;
 577                 case EFI_RUNTIME_SERVICES_CODE:
 578                         res->name = "Runtime Service Code";
 579                         break;
 580                 case EFI_RUNTIME_SERVICES_DATA:
 581                         res->name = "Runtime Service Data";
 582                         break;
 583                 case EFI_CONVENTIONAL_MEMORY:
 584                         res->name = "Conventional Memory";
 585                         break;
 586                 case EFI_UNUSABLE_MEMORY:
 587                         res->name = "Unusable Memory";
 588                         break;
 589                 case EFI_ACPI_RECLAIM_MEMORY:
 590                         res->name = "ACPI Reclaim";
 591                         break;
 592                 case EFI_ACPI_MEMORY_NVS:
 593                         res->name = "ACPI NVS";
 594                         break;
 595                 case EFI_MEMORY_MAPPED_IO:
 596                         res->name = "Memory Mapped IO";
 597                         break;
 598                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 599                         res->name = "Memory Mapped IO Port Space";
 600                         break;
 601                 default:
 602                         res->name = "Reserved";
 603                         break;
 604                 }
 605                 res->start = md->phys_addr;
 606                 res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
 607                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 608                 if (request_resource(&iomem_resource, res) < 0)
 609                         printk(KERN_ERR PFX "Failed to allocate res %s : "
 610                                 "0x%llx-0x%llx\n", res->name,
 611                                 (unsigned long long)res->start,
 612                                 (unsigned long long)res->end);
 613                 /*
 614                  * We don't know which region contains kernel data so we try
 615                  * it repeatedly and let the resource manager test it.
 616                  */
 617                 if (md->type == EFI_CONVENTIONAL_MEMORY) {
 618                         request_resource(res, code_resource);
 619                         request_resource(res, data_resource);
 620 #ifdef CONFIG_KEXEC
 621                         request_resource(res, &crashk_res);
 622 #endif
 623                 }
 624         }
 625 }
 626
 627 /*
 628  * Convenience functions to obtain memory types and attributes
 629  */
 630
 631 u32 efi_mem_type(unsigned long phys_addr)
 632 {
 633         efi_memory_desc_t *md;
 634         void *p;
 635
 636         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 637                 md = p;
 638                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 639                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 640                         return md->type;
 641         }
 642         return 0;
 643 }
 644
 645 u64 efi_mem_attributes(unsigned long phys_addr)
 646 {
 647         efi_memory_desc_t *md;
 648         void *p;
 649
 650         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 651                 md = p;
 652                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 653                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 654                         return md->attribute;
 655         }
 656         return 0;
 657 }