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