git.oblomov.eu Git - linux-2.6/blob - arch/ia64/kernel/efi.c

   1 /*
   2  * Extensible Firmware Interface
   3  *
   4  * Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
   5  *
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  * Copyright (C) 1999-2003 Hewlett-Packard Co.
   9  *      David Mosberger-Tang <davidm@hpl.hp.com>
  10  *      Stephane Eranian <eranian@hpl.hp.com>
  11  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  12  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  13  *
  14  * All EFI Runtime Services are not implemented yet as EFI only
  15  * supports physical mode addressing on SoftSDV. This is to be fixed
  16  * in a future version.  --drummond 1999-07-20
  17  *
  18  * Implemented EFI runtime services and virtual mode calls.  --davidm
  19  *
  20  * Goutham Rao: <goutham.rao@intel.com>
  21  *      Skip non-WB memory and ignore empty memory ranges.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <linux/time.h>
  28 #include <linux/efi.h>
  29 #include <linux/kexec.h>
  30
  31 #include <asm/io.h>
  32 #include <asm/kregs.h>
  33 #include <asm/meminit.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/processor.h>
  36 #include <asm/mca.h>
  37
  38 #define EFI_DEBUG       0
  39
  40 extern efi_status_t efi_call_phys (void *, ...);
  41
  42 struct efi efi;
  43 EXPORT_SYMBOL(efi);
  44 static efi_runtime_services_t *runtime;
  45 static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  46
  47 #define efi_call_virt(f, args...)       (*(f))(args)
  48
  49 #define STUB_GET_TIME(prefix, adjust_arg)                                                         \
  50 static efi_status_t                                                                               \
  51 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                            \
  52 {                                                                                                 \
  53         struct ia64_fpreg fr[6];                                                                  \
  54         efi_time_cap_t *atc = NULL;                                                               \
  55         efi_status_t ret;                                                                         \
  56                                                                                                   \
  57         if (tc)                                                                                   \
  58                 atc = adjust_arg(tc);                                                             \
  59         ia64_save_scratch_fpregs(fr);                                                             \
  60         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
  61         ia64_load_scratch_fpregs(fr);                                                             \
  62         return ret;                                                                               \
  63 }
  64
  65 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  66 static efi_status_t                                                                             \
  67 prefix##_set_time (efi_time_t *tm)                                                              \
  68 {                                                                                               \
  69         struct ia64_fpreg fr[6];                                                                \
  70         efi_status_t ret;                                                                       \
  71                                                                                                 \
  72         ia64_save_scratch_fpregs(fr);                                                           \
  73         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  74         ia64_load_scratch_fpregs(fr);                                                           \
  75         return ret;                                                                             \
  76 }
  77
  78 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  79 static efi_status_t                                                                             \
  80 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  81 {                                                                                               \
  82         struct ia64_fpreg fr[6];                                                                \
  83         efi_status_t ret;                                                                       \
  84                                                                                                 \
  85         ia64_save_scratch_fpregs(fr);                                                           \
  86         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  87                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  88         ia64_load_scratch_fpregs(fr);                                                           \
  89         return ret;                                                                             \
  90 }
  91
  92 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  93 static efi_status_t                                                                             \
  94 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
  95 {                                                                                               \
  96         struct ia64_fpreg fr[6];                                                                \
  97         efi_time_t *atm = NULL;                                                                 \
  98         efi_status_t ret;                                                                       \
  99                                                                                                 \
 100         if (tm)                                                                                 \
 101                 atm = adjust_arg(tm);                                                           \
 102         ia64_save_scratch_fpregs(fr);                                                           \
 103         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 104                                 enabled, atm);                                                  \
 105         ia64_load_scratch_fpregs(fr);                                                           \
 106         return ret;                                                                             \
 107 }
 108
 109 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 110 static efi_status_t                                                                     \
 111 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 112                        unsigned long *data_size, void *data)                            \
 113 {                                                                                       \
 114         struct ia64_fpreg fr[6];                                                        \
 115         u32 *aattr = NULL;                                                                      \
 116         efi_status_t ret;                                                               \
 117                                                                                         \
 118         if (attr)                                                                       \
 119                 aattr = adjust_arg(attr);                                               \
 120         ia64_save_scratch_fpregs(fr);                                                   \
 121         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 122                                 adjust_arg(name), adjust_arg(vendor), aattr,            \
 123                                 adjust_arg(data_size), adjust_arg(data));               \
 124         ia64_load_scratch_fpregs(fr);                                                   \
 125         return ret;                                                                     \
 126 }
 127
 128 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 129 static efi_status_t                                                                             \
 130 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 131 {                                                                                               \
 132         struct ia64_fpreg fr[6];                                                                \
 133         efi_status_t ret;                                                                       \
 134                                                                                                 \
 135         ia64_save_scratch_fpregs(fr);                                                           \
 136         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 137                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 138         ia64_load_scratch_fpregs(fr);                                                           \
 139         return ret;                                                                             \
 140 }
 141
 142 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 143 static efi_status_t                                                                     \
 144 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr,      \
 145                        unsigned long data_size, void *data)                             \
 146 {                                                                                       \
 147         struct ia64_fpreg fr[6];                                                        \
 148         efi_status_t ret;                                                               \
 149                                                                                         \
 150         ia64_save_scratch_fpregs(fr);                                                   \
 151         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 152                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 153                                 adjust_arg(data));                                      \
 154         ia64_load_scratch_fpregs(fr);                                                   \
 155         return ret;                                                                     \
 156 }
 157
 158 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 159 static efi_status_t                                                                             \
 160 prefix##_get_next_high_mono_count (u32 *count)                                                  \
 161 {                                                                                               \
 162         struct ia64_fpreg fr[6];                                                                \
 163         efi_status_t ret;                                                                       \
 164                                                                                                 \
 165         ia64_save_scratch_fpregs(fr);                                                           \
 166         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 167                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 168         ia64_load_scratch_fpregs(fr);                                                           \
 169         return ret;                                                                             \
 170 }
 171
 172 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 173 static void                                                                     \
 174 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 175                        unsigned long data_size, efi_char16_t *data)             \
 176 {                                                                               \
 177         struct ia64_fpreg fr[6];                                                \
 178         efi_char16_t *adata = NULL;                                             \
 179                                                                                 \
 180         if (data)                                                               \
 181                 adata = adjust_arg(data);                                       \
 182                                                                                 \
 183         ia64_save_scratch_fpregs(fr);                                           \
 184         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 185                           reset_type, status, data_size, adata);                \
 186         /* should not return, but just in case... */                            \
 187         ia64_load_scratch_fpregs(fr);                                           \
 188 }
 189
 190 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 191
 192 STUB_GET_TIME(phys, phys_ptr)
 193 STUB_SET_TIME(phys, phys_ptr)
 194 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 195 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 196 STUB_GET_VARIABLE(phys, phys_ptr)
 197 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 198 STUB_SET_VARIABLE(phys, phys_ptr)
 199 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 200 STUB_RESET_SYSTEM(phys, phys_ptr)
 201
 202 #define id(arg) arg
 203
 204 STUB_GET_TIME(virt, id)
 205 STUB_SET_TIME(virt, id)
 206 STUB_GET_WAKEUP_TIME(virt, id)
 207 STUB_SET_WAKEUP_TIME(virt, id)
 208 STUB_GET_VARIABLE(virt, id)
 209 STUB_GET_NEXT_VARIABLE(virt, id)
 210 STUB_SET_VARIABLE(virt, id)
 211 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 212 STUB_RESET_SYSTEM(virt, id)
 213
 214 void
 215 efi_gettimeofday (struct timespec *ts)
 216 {
 217         efi_time_t tm;
 218
 219         memset(ts, 0, sizeof(ts));
 220         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
 221                 return;
 222
 223         ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 224         ts->tv_nsec = tm.nanosecond;
 225 }
 226
 227 static int
 228 is_memory_available (efi_memory_desc_t *md)
 229 {
 230         if (!(md->attribute & EFI_MEMORY_WB))
 231                 return 0;
 232
 233         switch (md->type) {
 234               case EFI_LOADER_CODE:
 235               case EFI_LOADER_DATA:
 236               case EFI_BOOT_SERVICES_CODE:
 237               case EFI_BOOT_SERVICES_DATA:
 238               case EFI_CONVENTIONAL_MEMORY:
 239                 return 1;
 240         }
 241         return 0;
 242 }
 243
 244 typedef struct kern_memdesc {
 245         u64 attribute;
 246         u64 start;
 247         u64 num_pages;
 248 } kern_memdesc_t;
 249
 250 static kern_memdesc_t *kern_memmap;
 251
 252 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 253
 254 static inline u64
 255 kmd_end(kern_memdesc_t *kmd)
 256 {
 257         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 258 }
 259
 260 static inline u64
 261 efi_md_end(efi_memory_desc_t *md)
 262 {
 263         return (md->phys_addr + efi_md_size(md));
 264 }
 265
 266 static inline int
 267 efi_wb(efi_memory_desc_t *md)
 268 {
 269         return (md->attribute & EFI_MEMORY_WB);
 270 }
 271
 272 static inline int
 273 efi_uc(efi_memory_desc_t *md)
 274 {
 275         return (md->attribute & EFI_MEMORY_UC);
 276 }
 277
 278 static void
 279 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 280 {
 281         kern_memdesc_t *k;
 282         u64 start, end, voff;
 283
 284         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 285         for (k = kern_memmap; k->start != ~0UL; k++) {
 286                 if (k->attribute != attr)
 287                         continue;
 288                 start = PAGE_ALIGN(k->start);
 289                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 290                 if (start < end)
 291                         if ((*callback)(start + voff, end + voff, arg) < 0)
 292                                 return;
 293         }
 294 }
 295
 296 /*
 297  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 298  * has memory that is available for OS use.
 299  */
 300 void
 301 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 302 {
 303         walk(callback, arg, EFI_MEMORY_WB);
 304 }
 305
 306 /*
 307  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 308  * has memory that is available for uncached allocator.
 309  */
 310 void
 311 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 312 {
 313         walk(callback, arg, EFI_MEMORY_UC);
 314 }
 315
 316 /*
 317  * Look for the PAL_CODE region reported by EFI and maps it using an
 318  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 319  * Abstraction Layer chapter 11 in ADAG
 320  */
 321
 322 void *
 323 efi_get_pal_addr (void)
 324 {
 325         void *efi_map_start, *efi_map_end, *p;
 326         efi_memory_desc_t *md;
 327         u64 efi_desc_size;
 328         int pal_code_count = 0;
 329         u64 vaddr, mask;
 330
 331         efi_map_start = __va(ia64_boot_param->efi_memmap);
 332         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 333         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 334
 335         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 336                 md = p;
 337                 if (md->type != EFI_PAL_CODE)
 338                         continue;
 339
 340                 if (++pal_code_count > 1) {
 341                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 342                                md->phys_addr);
 343                         continue;
 344                 }
 345                 /*
 346                  * The only ITLB entry in region 7 that is used is the one installed by
 347                  * __start().  That entry covers a 64MB range.
 348                  */
 349                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 350                 vaddr = PAGE_OFFSET + md->phys_addr;
 351
 352                 /*
 353                  * We must check that the PAL mapping won't overlap with the kernel
 354                  * mapping.
 355                  *
 356                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 357                  * 256KB and that only one ITR is needed to map it. This implies that the
 358                  * PAL code is always aligned on its size, i.e., the closest matching page
 359                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 360                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 361                  * now the following test is enough to determine whether or not we need a
 362                  * dedicated ITR for the PAL code.
 363                  */
 364                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 365                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 366                                __FUNCTION__);
 367                         continue;
 368                 }
 369
 370                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 371                         panic("Woah!  PAL code size bigger than a granule!");
 372
 373 #if EFI_DEBUG
 374                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 375
 376                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 377                         smp_processor_id(), md->phys_addr,
 378                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 379                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 380 #endif
 381                 return __va(md->phys_addr);
 382         }
 383         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 384                __FUNCTION__);
 385         return NULL;
 386 }
 387
 388 void
 389 efi_map_pal_code (void)
 390 {
 391         void *pal_vaddr = efi_get_pal_addr ();
 392         u64 psr;
 393
 394         if (!pal_vaddr)
 395                 return;
 396
 397         /*
 398          * Cannot write to CRx with PSR.ic=1
 399          */
 400         psr = ia64_clear_ic();
 401         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 402                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 403                  IA64_GRANULE_SHIFT);
 404         ia64_set_psr(psr);              /* restore psr */
 405         ia64_srlz_i();
 406 }
 407
 408 void __init
 409 efi_init (void)
 410 {
 411         void *efi_map_start, *efi_map_end;
 412         efi_config_table_t *config_tables;
 413         efi_char16_t *c16;
 414         u64 efi_desc_size;
 415         char *cp, vendor[100] = "unknown";
 416         int i;
 417
 418         /* it's too early to be able to use the standard kernel command line support... */
 419         for (cp = boot_command_line; *cp; ) {
 420                 if (memcmp(cp, "mem=", 4) == 0) {
 421                         mem_limit = memparse(cp + 4, &cp);
 422                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 423                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 424                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 425                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 426                 } else {
 427                         while (*cp != ' ' && *cp)
 428                                 ++cp;
 429                         while (*cp == ' ')
 430                                 ++cp;
 431                 }
 432         }
 433         if (min_addr != 0UL)
 434                 printk(KERN_INFO "Ignoring memory below %luMB\n", min_addr >> 20);
 435         if (max_addr != ~0UL)
 436                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 437
 438         efi.systab = __va(ia64_boot_param->efi_systab);
 439
 440         /*
 441          * Verify the EFI Table
 442          */
 443         if (efi.systab == NULL)
 444                 panic("Woah! Can't find EFI system table.\n");
 445         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 446                 panic("Woah! EFI system table signature incorrect\n");
 447         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 448                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 449                        "got %d.%02d, expected %d.%02d\n",
 450                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 451                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 452
 453         config_tables = __va(efi.systab->tables);
 454
 455         /* Show what we know for posterity */
 456         c16 = __va(efi.systab->fw_vendor);
 457         if (c16) {
 458                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 459                         vendor[i] = *c16++;
 460                 vendor[i] = '\0';
 461         }
 462
 463         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 464                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 465
 466         efi.mps        = EFI_INVALID_TABLE_ADDR;
 467         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 468         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 469         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 470         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 471         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 472         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 473         efi.uga        = EFI_INVALID_TABLE_ADDR;
 474
 475         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 476                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 477                         efi.mps = config_tables[i].table;
 478                         printk(" MPS=0x%lx", config_tables[i].table);
 479                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 480                         efi.acpi20 = config_tables[i].table;
 481                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 482                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 483                         efi.acpi = config_tables[i].table;
 484                         printk(" ACPI=0x%lx", config_tables[i].table);
 485                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 486                         efi.smbios = config_tables[i].table;
 487                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 488                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 489                         efi.sal_systab = config_tables[i].table;
 490                         printk(" SALsystab=0x%lx", config_tables[i].table);
 491                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 492                         efi.hcdp = config_tables[i].table;
 493                         printk(" HCDP=0x%lx", config_tables[i].table);
 494                 }
 495         }
 496         printk("\n");
 497
 498         runtime = __va(efi.systab->runtime);
 499         efi.get_time = phys_get_time;
 500         efi.set_time = phys_set_time;
 501         efi.get_wakeup_time = phys_get_wakeup_time;
 502         efi.set_wakeup_time = phys_set_wakeup_time;
 503         efi.get_variable = phys_get_variable;
 504         efi.get_next_variable = phys_get_next_variable;
 505         efi.set_variable = phys_set_variable;
 506         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 507         efi.reset_system = phys_reset_system;
 508
 509         efi_map_start = __va(ia64_boot_param->efi_memmap);
 510         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 511         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 512
 513 #if EFI_DEBUG
 514         /* print EFI memory map: */
 515         {
 516                 efi_memory_desc_t *md;
 517                 void *p;
 518
 519                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 520                         md = p;
 521                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 522                                i, md->type, md->attribute, md->phys_addr,
 523                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 524                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 525                 }
 526         }
 527 #endif
 528
 529         efi_map_pal_code();
 530         efi_enter_virtual_mode();
 531 }
 532
 533 void
 534 efi_enter_virtual_mode (void)
 535 {
 536         void *efi_map_start, *efi_map_end, *p;
 537         efi_memory_desc_t *md;
 538         efi_status_t status;
 539         u64 efi_desc_size;
 540
 541         efi_map_start = __va(ia64_boot_param->efi_memmap);
 542         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 543         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 544
 545         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 546                 md = p;
 547                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 548                         /*
 549                          * Some descriptors have multiple bits set, so the order of
 550                          * the tests is relevant.
 551                          */
 552                         if (md->attribute & EFI_MEMORY_WB) {
 553                                 md->virt_addr = (u64) __va(md->phys_addr);
 554                         } else if (md->attribute & EFI_MEMORY_UC) {
 555                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 556                         } else if (md->attribute & EFI_MEMORY_WC) {
 557 #if 0
 558                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 559                                                                            | _PAGE_D
 560                                                                            | _PAGE_MA_WC
 561                                                                            | _PAGE_PL_0
 562                                                                            | _PAGE_AR_RW));
 563 #else
 564                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 565                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 566 #endif
 567                         } else if (md->attribute & EFI_MEMORY_WT) {
 568 #if 0
 569                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 570                                                                            | _PAGE_D | _PAGE_MA_WT
 571                                                                            | _PAGE_PL_0
 572                                                                            | _PAGE_AR_RW));
 573 #else
 574                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 575                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 576 #endif
 577                         }
 578                 }
 579         }
 580
 581         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 582                                ia64_boot_param->efi_memmap_size,
 583                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 584                                ia64_boot_param->efi_memmap);
 585         if (status != EFI_SUCCESS) {
 586                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 587                        "(status=%lu)\n", status);
 588                 return;
 589         }
 590
 591         /*
 592          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 593          */
 594         efi.get_time = virt_get_time;
 595         efi.set_time = virt_set_time;
 596         efi.get_wakeup_time = virt_get_wakeup_time;
 597         efi.set_wakeup_time = virt_set_wakeup_time;
 598         efi.get_variable = virt_get_variable;
 599         efi.get_next_variable = virt_get_next_variable;
 600         efi.set_variable = virt_set_variable;
 601         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 602         efi.reset_system = virt_reset_system;
 603 }
 604
 605 /*
 606  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 607  * this type, other I/O port ranges should be described via ACPI.
 608  */
 609 u64
 610 efi_get_iobase (void)
 611 {
 612         void *efi_map_start, *efi_map_end, *p;
 613         efi_memory_desc_t *md;
 614         u64 efi_desc_size;
 615
 616         efi_map_start = __va(ia64_boot_param->efi_memmap);
 617         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 618         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 619
 620         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 621                 md = p;
 622                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 623                         if (md->attribute & EFI_MEMORY_UC)
 624                                 return md->phys_addr;
 625                 }
 626         }
 627         return 0;
 628 }
 629
 630 static struct kern_memdesc *
 631 kern_memory_descriptor (unsigned long phys_addr)
 632 {
 633         struct kern_memdesc *md;
 634
 635         for (md = kern_memmap; md->start != ~0UL; md++) {
 636                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 637                          return md;
 638         }
 639         return NULL;
 640 }
 641
 642 static efi_memory_desc_t *
 643 efi_memory_descriptor (unsigned long phys_addr)
 644 {
 645         void *efi_map_start, *efi_map_end, *p;
 646         efi_memory_desc_t *md;
 647         u64 efi_desc_size;
 648
 649         efi_map_start = __va(ia64_boot_param->efi_memmap);
 650         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 651         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 652
 653         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 654                 md = p;
 655
 656                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 657                          return md;
 658         }
 659         return NULL;
 660 }
 661
 662 u32
 663 efi_mem_type (unsigned long phys_addr)
 664 {
 665         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 666
 667         if (md)
 668                 return md->type;
 669         return 0;
 670 }
 671
 672 u64
 673 efi_mem_attributes (unsigned long phys_addr)
 674 {
 675         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 676
 677         if (md)
 678                 return md->attribute;
 679         return 0;
 680 }
 681 EXPORT_SYMBOL(efi_mem_attributes);
 682
 683 u64
 684 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 685 {
 686         unsigned long end = phys_addr + size;
 687         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 688         u64 attr;
 689
 690         if (!md)
 691                 return 0;
 692
 693         /*
 694          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 695          * the kernel that firmware needs this region mapped.
 696          */
 697         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 698         do {
 699                 unsigned long md_end = efi_md_end(md);
 700
 701                 if (end <= md_end)
 702                         return attr;
 703
 704                 md = efi_memory_descriptor(md_end);
 705                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 706                         return 0;
 707         } while (md);
 708         return 0;
 709 }
 710
 711 u64
 712 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 713 {
 714         unsigned long end = phys_addr + size;
 715         struct kern_memdesc *md;
 716         u64 attr;
 717
 718         /*
 719          * This is a hack for ioremap calls before we set up kern_memmap.
 720          * Maybe we should do efi_memmap_init() earlier instead.
 721          */
 722         if (!kern_memmap) {
 723                 attr = efi_mem_attribute(phys_addr, size);
 724                 if (attr & EFI_MEMORY_WB)
 725                         return EFI_MEMORY_WB;
 726                 return 0;
 727         }
 728
 729         md = kern_memory_descriptor(phys_addr);
 730         if (!md)
 731                 return 0;
 732
 733         attr = md->attribute;
 734         do {
 735                 unsigned long md_end = kmd_end(md);
 736
 737                 if (end <= md_end)
 738                         return attr;
 739
 740                 md = kern_memory_descriptor(md_end);
 741                 if (!md || md->attribute != attr)
 742                         return 0;
 743         } while (md);
 744         return 0;
 745 }
 746 EXPORT_SYMBOL(kern_mem_attribute);
 747
 748 int
 749 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 750 {
 751         u64 attr;
 752
 753         /*
 754          * /dev/mem reads and writes use copy_to_user(), which implicitly
 755          * uses a granule-sized kernel identity mapping.  It's really
 756          * only safe to do this for regions in kern_memmap.  For more
 757          * details, see Documentation/ia64/aliasing.txt.
 758          */
 759         attr = kern_mem_attribute(phys_addr, size);
 760         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 761                 return 1;
 762         return 0;
 763 }
 764
 765 int
 766 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 767 {
 768         /*
 769          * MMIO regions are often missing from the EFI memory map.
 770          * We must allow mmap of them for programs like X, so we
 771          * currently can't do any useful validation.
 772          */
 773         return 1;
 774 }
 775
 776 pgprot_t
 777 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 778                      pgprot_t vma_prot)
 779 {
 780         unsigned long phys_addr = pfn << PAGE_SHIFT;
 781         u64 attr;
 782
 783         /*
 784          * For /dev/mem mmap, we use user mappings, but if the region is
 785          * in kern_memmap (and hence may be covered by a kernel mapping),
 786          * we must use the same attribute as the kernel mapping.
 787          */
 788         attr = kern_mem_attribute(phys_addr, size);
 789         if (attr & EFI_MEMORY_WB)
 790                 return pgprot_cacheable(vma_prot);
 791         else if (attr & EFI_MEMORY_UC)
 792                 return pgprot_noncached(vma_prot);
 793
 794         /*
 795          * Some chipsets don't support UC access to memory.  If
 796          * WB is supported, we prefer that.
 797          */
 798         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 799                 return pgprot_cacheable(vma_prot);
 800
 801         return pgprot_noncached(vma_prot);
 802 }
 803
 804 int __init
 805 efi_uart_console_only(void)
 806 {
 807         efi_status_t status;
 808         char *s, name[] = "ConOut";
 809         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 810         efi_char16_t *utf16, name_utf16[32];
 811         unsigned char data[1024];
 812         unsigned long size = sizeof(data);
 813         struct efi_generic_dev_path *hdr, *end_addr;
 814         int uart = 0;
 815
 816         /* Convert to UTF-16 */
 817         utf16 = name_utf16;
 818         s = name;
 819         while (*s)
 820                 *utf16++ = *s++ & 0x7f;
 821         *utf16 = 0;
 822
 823         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 824         if (status != EFI_SUCCESS) {
 825                 printk(KERN_ERR "No EFI %s variable?\n", name);
 826                 return 0;
 827         }
 828
 829         hdr = (struct efi_generic_dev_path *) data;
 830         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 831         while (hdr < end_addr) {
 832                 if (hdr->type == EFI_DEV_MSG &&
 833                     hdr->sub_type == EFI_DEV_MSG_UART)
 834                         uart = 1;
 835                 else if (hdr->type == EFI_DEV_END_PATH ||
 836                           hdr->type == EFI_DEV_END_PATH2) {
 837                         if (!uart)
 838                                 return 0;
 839                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 840                                 return 1;
 841                         uart = 0;
 842                 }
 843                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 844         }
 845         printk(KERN_ERR "Malformed %s value\n", name);
 846         return 0;
 847 }
 848
 849 /*
 850  * Look for the first granule aligned memory descriptor memory
 851  * that is big enough to hold EFI memory map. Make sure this
 852  * descriptor is atleast granule sized so it does not get trimmed
 853  */
 854 struct kern_memdesc *
 855 find_memmap_space (void)
 856 {
 857         u64     contig_low=0, contig_high=0;
 858         u64     as = 0, ae;
 859         void *efi_map_start, *efi_map_end, *p, *q;
 860         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 861         u64     space_needed, efi_desc_size;
 862         unsigned long total_mem = 0;
 863
 864         efi_map_start = __va(ia64_boot_param->efi_memmap);
 865         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 866         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 867
 868         /*
 869          * Worst case: we need 3 kernel descriptors for each efi descriptor
 870          * (if every entry has a WB part in the middle, and UC head and tail),
 871          * plus one for the end marker.
 872          */
 873         space_needed = sizeof(kern_memdesc_t) *
 874                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 875
 876         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 877                 md = p;
 878                 if (!efi_wb(md)) {
 879                         continue;
 880                 }
 881                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 882                         contig_low = GRANULEROUNDUP(md->phys_addr);
 883                         contig_high = efi_md_end(md);
 884                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 885                                 check_md = q;
 886                                 if (!efi_wb(check_md))
 887                                         break;
 888                                 if (contig_high != check_md->phys_addr)
 889                                         break;
 890                                 contig_high = efi_md_end(check_md);
 891                         }
 892                         contig_high = GRANULEROUNDDOWN(contig_high);
 893                 }
 894                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
 895                         continue;
 896
 897                 /* Round ends inward to granule boundaries */
 898                 as = max(contig_low, md->phys_addr);
 899                 ae = min(contig_high, efi_md_end(md));
 900
 901                 /* keep within max_addr= and min_addr= command line arg */
 902                 as = max(as, min_addr);
 903                 ae = min(ae, max_addr);
 904                 if (ae <= as)
 905                         continue;
 906
 907                 /* avoid going over mem= command line arg */
 908                 if (total_mem + (ae - as) > mem_limit)
 909                         ae -= total_mem + (ae - as) - mem_limit;
 910
 911                 if (ae <= as)
 912                         continue;
 913
 914                 if (ae - as > space_needed)
 915                         break;
 916         }
 917         if (p >= efi_map_end)
 918                 panic("Can't allocate space for kernel memory descriptors");
 919
 920         return __va(as);
 921 }
 922
 923 /*
 924  * Walk the EFI memory map and gather all memory available for kernel
 925  * to use.  We can allocate partial granules only if the unavailable
 926  * parts exist, and are WB.
 927  */
 928 void
 929 efi_memmap_init(unsigned long *s, unsigned long *e)
 930 {
 931         struct kern_memdesc *k, *prev = NULL;
 932         u64     contig_low=0, contig_high=0;
 933         u64     as, ae, lim;
 934         void *efi_map_start, *efi_map_end, *p, *q;
 935         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 936         u64     efi_desc_size;
 937         unsigned long total_mem = 0;
 938
 939         k = kern_memmap = find_memmap_space();
 940
 941         efi_map_start = __va(ia64_boot_param->efi_memmap);
 942         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 943         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 944
 945         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 946                 md = p;
 947                 if (!efi_wb(md)) {
 948                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 949                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 950                                 k->attribute = EFI_MEMORY_UC;
 951                                 k->start = md->phys_addr;
 952                                 k->num_pages = md->num_pages;
 953                                 k++;
 954                         }
 955                         continue;
 956                 }
 957                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 958                         contig_low = GRANULEROUNDUP(md->phys_addr);
 959                         contig_high = efi_md_end(md);
 960                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 961                                 check_md = q;
 962                                 if (!efi_wb(check_md))
 963                                         break;
 964                                 if (contig_high != check_md->phys_addr)
 965                                         break;
 966                                 contig_high = efi_md_end(check_md);
 967                         }
 968                         contig_high = GRANULEROUNDDOWN(contig_high);
 969                 }
 970                 if (!is_memory_available(md))
 971                         continue;
 972
 973                 /*
 974                  * Round ends inward to granule boundaries
 975                  * Give trimmings to uncached allocator
 976                  */
 977                 if (md->phys_addr < contig_low) {
 978                         lim = min(efi_md_end(md), contig_low);
 979                         if (efi_uc(md)) {
 980                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
 981                                     kmd_end(k-1) == md->phys_addr) {
 982                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 983                                 } else {
 984                                         k->attribute = EFI_MEMORY_UC;
 985                                         k->start = md->phys_addr;
 986                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 987                                         k++;
 988                                 }
 989                         }
 990                         as = contig_low;
 991                 } else
 992                         as = md->phys_addr;
 993
 994                 if (efi_md_end(md) > contig_high) {
 995                         lim = max(md->phys_addr, contig_high);
 996                         if (efi_uc(md)) {
 997                                 if (lim == md->phys_addr && k > kern_memmap &&
 998                                     (k-1)->attribute == EFI_MEMORY_UC &&
 999                                     kmd_end(k-1) == md->phys_addr) {
1000                                         (k-1)->num_pages += md->num_pages;
1001                                 } else {
1002                                         k->attribute = EFI_MEMORY_UC;
1003                                         k->start = lim;
1004                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
1005                                         k++;
1006                                 }
1007                         }
1008                         ae = contig_high;
1009                 } else
1010                         ae = efi_md_end(md);
1011
1012                 /* keep within max_addr= and min_addr= command line arg */
1013                 as = max(as, min_addr);
1014                 ae = min(ae, max_addr);
1015                 if (ae <= as)
1016                         continue;
1017
1018                 /* avoid going over mem= command line arg */
1019                 if (total_mem + (ae - as) > mem_limit)
1020                         ae -= total_mem + (ae - as) - mem_limit;
1021
1022                 if (ae <= as)
1023                         continue;
1024                 if (prev && kmd_end(prev) == md->phys_addr) {
1025                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1026                         total_mem += ae - as;
1027                         continue;
1028                 }
1029                 k->attribute = EFI_MEMORY_WB;
1030                 k->start = as;
1031                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1032                 total_mem += ae - as;
1033                 prev = k++;
1034         }
1035         k->start = ~0L; /* end-marker */
1036
1037         /* reserve the memory we are using for kern_memmap */
1038         *s = (u64)kern_memmap;
1039         *e = (u64)++k;
1040 }
1041
1042 void
1043 efi_initialize_iomem_resources(struct resource *code_resource,
1044                                struct resource *data_resource)
1045 {
1046         struct resource *res;
1047         void *efi_map_start, *efi_map_end, *p;
1048         efi_memory_desc_t *md;
1049         u64 efi_desc_size;
1050         char *name;
1051         unsigned long flags;
1052
1053         efi_map_start = __va(ia64_boot_param->efi_memmap);
1054         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1055         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1056
1057         res = NULL;
1058
1059         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1060                 md = p;
1061
1062                 if (md->num_pages == 0) /* should not happen */
1063                         continue;
1064
1065                 flags = IORESOURCE_MEM;
1066                 switch (md->type) {
1067
1068                         case EFI_MEMORY_MAPPED_IO:
1069                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1070                                 continue;
1071
1072                         case EFI_LOADER_CODE:
1073                         case EFI_LOADER_DATA:
1074                         case EFI_BOOT_SERVICES_DATA:
1075                         case EFI_BOOT_SERVICES_CODE:
1076                         case EFI_CONVENTIONAL_MEMORY:
1077                                 if (md->attribute & EFI_MEMORY_WP) {
1078                                         name = "System ROM";
1079                                         flags |= IORESOURCE_READONLY;
1080                                 } else {
1081                                         name = "System RAM";
1082                                 }
1083                                 break;
1084
1085                         case EFI_ACPI_MEMORY_NVS:
1086                                 name = "ACPI Non-volatile Storage";
1087                                 flags |= IORESOURCE_BUSY;
1088                                 break;
1089
1090                         case EFI_UNUSABLE_MEMORY:
1091                                 name = "reserved";
1092                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1093                                 break;
1094
1095                         case EFI_RESERVED_TYPE:
1096                         case EFI_RUNTIME_SERVICES_CODE:
1097                         case EFI_RUNTIME_SERVICES_DATA:
1098                         case EFI_ACPI_RECLAIM_MEMORY:
1099                         default:
1100                                 name = "reserved";
1101                                 flags |= IORESOURCE_BUSY;
1102                                 break;
1103                 }
1104
1105                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1106                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1107                         return;
1108                 }
1109
1110                 res->name = name;
1111                 res->start = md->phys_addr;
1112                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1113                 res->flags = flags;
1114
1115                 if (insert_resource(&iomem_resource, res) < 0)
1116                         kfree(res);
1117                 else {
1118                         /*
1119                          * We don't know which region contains
1120                          * kernel data so we try it repeatedly and
1121                          * let the resource manager test it.
1122                          */
1123                         insert_resource(res, code_resource);
1124                         insert_resource(res, data_resource);
1125 #ifdef CONFIG_KEXEC
1126                         insert_resource(res, &efi_memmap_res);
1127                         insert_resource(res, &boot_param_res);
1128                         if (crashk_res.end > crashk_res.start)
1129                                 insert_resource(res, &crashk_res);
1130 #endif
1131                 }
1132         }
1133 }
1134
1135 #ifdef CONFIG_KEXEC
1136 /* find a block of memory aligned to 64M exclude reserved regions
1137    rsvd_regions are sorted
1138  */
1139 unsigned long
1140 kdump_find_rsvd_region (unsigned long size,
1141                 struct rsvd_region *r, int n)
1142 {
1143   int i;
1144   u64 start, end;
1145   u64 alignment = 1UL << _PAGE_SIZE_64M;
1146   void *efi_map_start, *efi_map_end, *p;
1147   efi_memory_desc_t *md;
1148   u64 efi_desc_size;
1149
1150   efi_map_start = __va(ia64_boot_param->efi_memmap);
1151   efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1152   efi_desc_size = ia64_boot_param->efi_memdesc_size;
1153
1154   for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1155           md = p;
1156           if (!efi_wb(md))
1157                   continue;
1158           start = ALIGN(md->phys_addr, alignment);
1159           end = efi_md_end(md);
1160           for (i = 0; i < n; i++) {
1161                 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1162                         if (__pa(r[i].start) > start + size)
1163                                 return start;
1164                         start = ALIGN(__pa(r[i].end), alignment);
1165                         if (i < n-1 && __pa(r[i+1].start) < start + size)
1166                                 continue;
1167                         else
1168                                 break;
1169                 }
1170           }
1171           if (end > start + size)
1172                 return start;
1173   }
1174
1175   printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
1176         size);
1177   return ~0UL;
1178 }
1179 #endif