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)
  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)
 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 should only be used during kernel init and before runtime
 198  * services have been remapped, therefore, we'll need to call in physical
 199  * mode.  Note, this call isn't used later, so mark it __init.
 200  */
 201 inline unsigned long __init efi_get_time(void)
 202 {
 203         efi_status_t status;
 204         efi_time_t eft;
 205         efi_time_cap_t cap;
 206
 207         status = phys_efi_get_time(&eft, &cap);
 208         if (status != EFI_SUCCESS)
 209                 printk("Oops: efitime: can't read time status: 0x%lx\n",status);
 210
 211         return mktime(eft.year, eft.month, eft.day, eft.hour,
 212                         eft.minute, eft.second);
 213 }
 214
 215 int is_available_memory(efi_memory_desc_t * md)
 216 {
 217         if (!(md->attribute & EFI_MEMORY_WB))
 218                 return 0;
 219
 220         switch (md->type) {
 221                 case EFI_LOADER_CODE:
 222                 case EFI_LOADER_DATA:
 223                 case EFI_BOOT_SERVICES_CODE:
 224                 case EFI_BOOT_SERVICES_DATA:
 225                 case EFI_CONVENTIONAL_MEMORY:
 226                         return 1;
 227         }
 228         return 0;
 229 }
 230
 231 /*
 232  * We need to map the EFI memory map again after paging_init().
 233  */
 234 void __init efi_map_memmap(void)
 235 {
 236         memmap.map = NULL;
 237
 238         memmap.map = bt_ioremap((unsigned long) memmap.phys_map,
 239                         (memmap.nr_map * memmap.desc_size));
 240         if (memmap.map == NULL)
 241                 printk(KERN_ERR PFX "Could not remap the EFI memmap!\n");
 242
 243         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 244 }
 245
 246 #if EFI_DEBUG
 247 static void __init print_efi_memmap(void)
 248 {
 249         efi_memory_desc_t *md;
 250         void *p;
 251         int i;
 252
 253         for (p = memmap.map, i = 0; p < memmap.map_end; p += memmap.desc_size, i++) {
 254                 md = p;
 255                 printk(KERN_INFO "mem%02u: type=%u, attr=0x%llx, "
 256                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 257                         i, md->type, md->attribute, md->phys_addr,
 258                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 259                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 260         }
 261 }
 262 #endif  /*  EFI_DEBUG  */
 263
 264 /*
 265  * Walks the EFI memory map and calls CALLBACK once for each EFI
 266  * memory descriptor that has memory that is available for kernel use.
 267  */
 268 void efi_memmap_walk(efi_freemem_callback_t callback, void *arg)
 269 {
 270         int prev_valid = 0;
 271         struct range {
 272                 unsigned long start;
 273                 unsigned long end;
 274         } prev, curr;
 275         efi_memory_desc_t *md;
 276         unsigned long start, end;
 277         void *p;
 278
 279         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 280                 md = p;
 281
 282                 if ((md->num_pages == 0) || (!is_available_memory(md)))
 283                         continue;
 284
 285                 curr.start = md->phys_addr;
 286                 curr.end = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 287
 288                 if (!prev_valid) {
 289                         prev = curr;
 290                         prev_valid = 1;
 291                 } else {
 292                         if (curr.start < prev.start)
 293                                 printk(KERN_INFO PFX "Unordered memory map\n");
 294                         if (prev.end == curr.start)
 295                                 prev.end = curr.end;
 296                         else {
 297                                 start =
 298                                     (unsigned long) (PAGE_ALIGN(prev.start));
 299                                 end = (unsigned long) (prev.end & PAGE_MASK);
 300                                 if ((end > start)
 301                                     && (*callback) (start, end, arg) < 0)
 302                                         return;
 303                                 prev = curr;
 304                         }
 305                 }
 306         }
 307         if (prev_valid) {
 308                 start = (unsigned long) PAGE_ALIGN(prev.start);
 309                 end = (unsigned long) (prev.end & PAGE_MASK);
 310                 if (end > start)
 311                         (*callback) (start, end, arg);
 312         }
 313 }
 314
 315 void __init efi_init(void)
 316 {
 317         efi_config_table_t *config_tables;
 318         efi_runtime_services_t *runtime;
 319         efi_char16_t *c16;
 320         char vendor[100] = "unknown";
 321         unsigned long num_config_tables;
 322         int i = 0;
 323
 324         memset(&efi, 0, sizeof(efi) );
 325         memset(&efi_phys, 0, sizeof(efi_phys));
 326
 327         efi_phys.systab = EFI_SYSTAB;
 328         memmap.phys_map = EFI_MEMMAP;
 329         memmap.nr_map = EFI_MEMMAP_SIZE/EFI_MEMDESC_SIZE;
 330         memmap.desc_version = EFI_MEMDESC_VERSION;
 331         memmap.desc_size = EFI_MEMDESC_SIZE;
 332
 333         efi.systab = (efi_system_table_t *)
 334                 boot_ioremap((unsigned long) efi_phys.systab,
 335                         sizeof(efi_system_table_t));
 336         /*
 337          * Verify the EFI Table
 338          */
 339         if (efi.systab == NULL)
 340                 printk(KERN_ERR PFX "Woah! Couldn't map the EFI system table.\n");
 341         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 342                 printk(KERN_ERR PFX "Woah! EFI system table signature incorrect\n");
 343         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 344                 printk(KERN_ERR PFX
 345                        "Warning: EFI system table major version mismatch: "
 346                        "got %d.%02d, expected %d.%02d\n",
 347                        efi.systab->hdr.revision >> 16,
 348                        efi.systab->hdr.revision & 0xffff,
 349                        EFI_SYSTEM_TABLE_REVISION >> 16,
 350                        EFI_SYSTEM_TABLE_REVISION & 0xffff);
 351         /*
 352          * Grab some details from the system table
 353          */
 354         num_config_tables = efi.systab->nr_tables;
 355         config_tables = (efi_config_table_t *)efi.systab->tables;
 356         runtime = efi.systab->runtime;
 357
 358         /*
 359          * Show what we know for posterity
 360          */
 361         c16 = (efi_char16_t *) boot_ioremap(efi.systab->fw_vendor, 2);
 362         if (c16) {
 363                 for (i = 0; i < (sizeof(vendor) - 1) && *c16; ++i)
 364                         vendor[i] = *c16++;
 365                 vendor[i] = '\0';
 366         } else
 367                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 368
 369         printk(KERN_INFO PFX "EFI v%u.%.02u by %s \n",
 370                efi.systab->hdr.revision >> 16,
 371                efi.systab->hdr.revision & 0xffff, vendor);
 372
 373         /*
 374          * Let's see what config tables the firmware passed to us.
 375          */
 376         config_tables = (efi_config_table_t *)
 377                                 boot_ioremap((unsigned long) config_tables,
 378                                 num_config_tables * sizeof(efi_config_table_t));
 379
 380         if (config_tables == NULL)
 381                 printk(KERN_ERR PFX "Could not map EFI Configuration Table!\n");
 382
 383         efi.mps        = EFI_INVALID_TABLE_ADDR;
 384         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 385         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 386         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 387         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 388         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 389         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 390         efi.uga        = EFI_INVALID_TABLE_ADDR;
 391
 392         for (i = 0; i < num_config_tables; i++) {
 393                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 394                         efi.mps = config_tables[i].table;
 395                         printk(KERN_INFO " MPS=0x%lx ", config_tables[i].table);
 396                 } else
 397                     if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 398                         efi.acpi20 = config_tables[i].table;
 399                         printk(KERN_INFO " ACPI 2.0=0x%lx ", config_tables[i].table);
 400                 } else
 401                     if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 402                         efi.acpi = config_tables[i].table;
 403                         printk(KERN_INFO " ACPI=0x%lx ", config_tables[i].table);
 404                 } else
 405                     if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 406                         efi.smbios = config_tables[i].table;
 407                         printk(KERN_INFO " SMBIOS=0x%lx ", config_tables[i].table);
 408                 } else
 409                     if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 410                         efi.hcdp = config_tables[i].table;
 411                         printk(KERN_INFO " HCDP=0x%lx ", config_tables[i].table);
 412                 } else
 413                     if (efi_guidcmp(config_tables[i].guid, UGA_IO_PROTOCOL_GUID) == 0) {
 414                         efi.uga = config_tables[i].table;
 415                         printk(KERN_INFO " UGA=0x%lx ", config_tables[i].table);
 416                 }
 417         }
 418         printk("\n");
 419
 420         /*
 421          * Check out the runtime services table. We need to map
 422          * the runtime services table so that we can grab the physical
 423          * address of several of the EFI runtime functions, needed to
 424          * set the firmware into virtual mode.
 425          */
 426
 427         runtime = (efi_runtime_services_t *) boot_ioremap((unsigned long)
 428                                                 runtime,
 429                                                 sizeof(efi_runtime_services_t));
 430         if (runtime != NULL) {
 431                 /*
 432                  * We will only need *early* access to the following
 433                  * two EFI runtime services before set_virtual_address_map
 434                  * is invoked.
 435                  */
 436                 efi_phys.get_time = (efi_get_time_t *) runtime->get_time;
 437                 efi_phys.set_virtual_address_map =
 438                         (efi_set_virtual_address_map_t *)
 439                                 runtime->set_virtual_address_map;
 440         } else
 441                 printk(KERN_ERR PFX "Could not map the runtime service table!\n");
 442
 443         /* Map the EFI memory map for use until paging_init() */
 444         memmap.map = boot_ioremap((unsigned long) EFI_MEMMAP, EFI_MEMMAP_SIZE);
 445         if (memmap.map == NULL)
 446                 printk(KERN_ERR PFX "Could not map the EFI memory map!\n");
 447
 448         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 449
 450 #if EFI_DEBUG
 451         print_efi_memmap();
 452 #endif
 453 }
 454
 455 static inline void __init check_range_for_systab(efi_memory_desc_t *md)
 456 {
 457         if (((unsigned long)md->phys_addr <= (unsigned long)efi_phys.systab) &&
 458                 ((unsigned long)efi_phys.systab < md->phys_addr +
 459                 ((unsigned long)md->num_pages << EFI_PAGE_SHIFT))) {
 460                 unsigned long addr;
 461
 462                 addr = md->virt_addr - md->phys_addr +
 463                         (unsigned long)efi_phys.systab;
 464                 efi.systab = (efi_system_table_t *)addr;
 465         }
 466 }
 467
 468 /*
 469  * This function will switch the EFI runtime services to virtual mode.
 470  * Essentially, look through the EFI memmap and map every region that
 471  * has the runtime attribute bit set in its memory descriptor and update
 472  * that memory descriptor with the virtual address obtained from ioremap().
 473  * This enables the runtime services to be called without having to
 474  * thunk back into physical mode for every invocation.
 475  */
 476
 477 void __init efi_enter_virtual_mode(void)
 478 {
 479         efi_memory_desc_t *md;
 480         efi_status_t status;
 481         void *p;
 482
 483         efi.systab = NULL;
 484
 485         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 486                 md = p;
 487
 488                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 489                         continue;
 490
 491                 md->virt_addr = (unsigned long)ioremap(md->phys_addr,
 492                         md->num_pages << EFI_PAGE_SHIFT);
 493                 if (!(unsigned long)md->virt_addr) {
 494                         printk(KERN_ERR PFX "ioremap of 0x%lX failed\n",
 495                                 (unsigned long)md->phys_addr);
 496                 }
 497                 /* update the virtual address of the EFI system table */
 498                 check_range_for_systab(md);
 499         }
 500
 501         if (!efi.systab)
 502                 BUG();
 503
 504         status = phys_efi_set_virtual_address_map(
 505                         memmap.desc_size * memmap.nr_map,
 506                         memmap.desc_size,
 507                         memmap.desc_version,
 508                         memmap.phys_map);
 509
 510         if (status != EFI_SUCCESS) {
 511                 printk (KERN_ALERT "You are screwed! "
 512                         "Unable to switch EFI into virtual mode "
 513                         "(status=%lx)\n", status);
 514                 panic("EFI call to SetVirtualAddressMap() failed!");
 515         }
 516
 517         /*
 518          * Now that EFI is in virtual mode, update the function
 519          * pointers in the runtime service table to the new virtual addresses.
 520          */
 521
 522         efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time;
 523         efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time;
 524         efi.get_wakeup_time = (efi_get_wakeup_time_t *)
 525                                         efi.systab->runtime->get_wakeup_time;
 526         efi.set_wakeup_time = (efi_set_wakeup_time_t *)
 527                                         efi.systab->runtime->set_wakeup_time;
 528         efi.get_variable = (efi_get_variable_t *)
 529                                         efi.systab->runtime->get_variable;
 530         efi.get_next_variable = (efi_get_next_variable_t *)
 531                                         efi.systab->runtime->get_next_variable;
 532         efi.set_variable = (efi_set_variable_t *)
 533                                         efi.systab->runtime->set_variable;
 534         efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
 535                                         efi.systab->runtime->get_next_high_mono_count;
 536         efi.reset_system = (efi_reset_system_t *)
 537                                         efi.systab->runtime->reset_system;
 538 }
 539
 540 void __init
 541 efi_initialize_iomem_resources(struct resource *code_resource,
 542                                struct resource *data_resource)
 543 {
 544         struct resource *res;
 545         efi_memory_desc_t *md;
 546         void *p;
 547
 548         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 549                 md = p;
 550
 551                 if ((md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >
 552                     0x100000000ULL)
 553                         continue;
 554                 res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
 555                 switch (md->type) {
 556                 case EFI_RESERVED_TYPE:
 557                         res->name = "Reserved Memory";
 558                         break;
 559                 case EFI_LOADER_CODE:
 560                         res->name = "Loader Code";
 561                         break;
 562                 case EFI_LOADER_DATA:
 563                         res->name = "Loader Data";
 564                         break;
 565                 case EFI_BOOT_SERVICES_DATA:
 566                         res->name = "BootServices Data";
 567                         break;
 568                 case EFI_BOOT_SERVICES_CODE:
 569                         res->name = "BootServices Code";
 570                         break;
 571                 case EFI_RUNTIME_SERVICES_CODE:
 572                         res->name = "Runtime Service Code";
 573                         break;
 574                 case EFI_RUNTIME_SERVICES_DATA:
 575                         res->name = "Runtime Service Data";
 576                         break;
 577                 case EFI_CONVENTIONAL_MEMORY:
 578                         res->name = "Conventional Memory";
 579                         break;
 580                 case EFI_UNUSABLE_MEMORY:
 581                         res->name = "Unusable Memory";
 582                         break;
 583                 case EFI_ACPI_RECLAIM_MEMORY:
 584                         res->name = "ACPI Reclaim";
 585                         break;
 586                 case EFI_ACPI_MEMORY_NVS:
 587                         res->name = "ACPI NVS";
 588                         break;
 589                 case EFI_MEMORY_MAPPED_IO:
 590                         res->name = "Memory Mapped IO";
 591                         break;
 592                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 593                         res->name = "Memory Mapped IO Port Space";
 594                         break;
 595                 default:
 596                         res->name = "Reserved";
 597                         break;
 598                 }
 599                 res->start = md->phys_addr;
 600                 res->end = res->start + ((md->num_pages << EFI_PAGE_SHIFT) - 1);
 601                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 602                 if (request_resource(&iomem_resource, res) < 0)
 603                         printk(KERN_ERR PFX "Failed to allocate res %s : "
 604                                 "0x%llx-0x%llx\n", res->name,
 605                                 (unsigned long long)res->start,
 606                                 (unsigned long long)res->end);
 607                 /*
 608                  * We don't know which region contains kernel data so we try
 609                  * it repeatedly and let the resource manager test it.
 610                  */
 611                 if (md->type == EFI_CONVENTIONAL_MEMORY) {
 612                         request_resource(res, code_resource);
 613                         request_resource(res, data_resource);
 614 #ifdef CONFIG_KEXEC
 615                         request_resource(res, &crashk_res);
 616 #endif
 617                 }
 618         }
 619 }
 620
 621 /*
 622  * Convenience functions to obtain memory types and attributes
 623  */
 624
 625 u32 efi_mem_type(unsigned long phys_addr)
 626 {
 627         efi_memory_desc_t *md;
 628         void *p;
 629
 630         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 631                 md = p;
 632                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 633                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 634                         return md->type;
 635         }
 636         return 0;
 637 }
 638
 639 u64 efi_mem_attributes(unsigned long phys_addr)
 640 {
 641         efi_memory_desc_t *md;
 642         void *p;
 643
 644         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 645                 md = p;
 646                 if ((md->phys_addr <= phys_addr) && (phys_addr <
 647                         (md->phys_addr + (md-> num_pages << EFI_PAGE_SHIFT)) ))
 648                         return md->attribute;
 649         }
 650         return 0;
 651 }