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