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         extern char saved_command_line[];
 417         int i;
 418
 419         /* it's too early to be able to use the standard kernel command line support... */
 420         for (cp = saved_command_line; *cp; ) {
 421                 if (memcmp(cp, "mem=", 4) == 0) {
 422                         mem_limit = memparse(cp + 4, &cp);
 423                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 424                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 425                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 426                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 427                 } else {
 428                         while (*cp != ' ' && *cp)
 429                                 ++cp;
 430                         while (*cp == ' ')
 431                                 ++cp;
 432                 }
 433         }
 434         if (min_addr != 0UL)
 435                 printk(KERN_INFO "Ignoring memory below %luMB\n", min_addr >> 20);
 436         if (max_addr != ~0UL)
 437                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 438
 439         efi.systab = __va(ia64_boot_param->efi_systab);
 440
 441         /*
 442          * Verify the EFI Table
 443          */
 444         if (efi.systab == NULL)
 445                 panic("Woah! Can't find EFI system table.\n");
 446         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 447                 panic("Woah! EFI system table signature incorrect\n");
 448         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 449                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 450                        "got %d.%02d, expected %d.%02d\n",
 451                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 452                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 453
 454         config_tables = __va(efi.systab->tables);
 455
 456         /* Show what we know for posterity */
 457         c16 = __va(efi.systab->fw_vendor);
 458         if (c16) {
 459                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 460                         vendor[i] = *c16++;
 461                 vendor[i] = '\0';
 462         }
 463
 464         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 465                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 466
 467         efi.mps        = EFI_INVALID_TABLE_ADDR;
 468         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 469         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 470         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 471         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 472         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 473         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 474         efi.uga        = EFI_INVALID_TABLE_ADDR;
 475
 476         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 477                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 478                         efi.mps = config_tables[i].table;
 479                         printk(" MPS=0x%lx", config_tables[i].table);
 480                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 481                         efi.acpi20 = config_tables[i].table;
 482                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 483                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 484                         efi.acpi = config_tables[i].table;
 485                         printk(" ACPI=0x%lx", config_tables[i].table);
 486                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 487                         efi.smbios = config_tables[i].table;
 488                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 489                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 490                         efi.sal_systab = config_tables[i].table;
 491                         printk(" SALsystab=0x%lx", config_tables[i].table);
 492                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 493                         efi.hcdp = config_tables[i].table;
 494                         printk(" HCDP=0x%lx", config_tables[i].table);
 495                 }
 496         }
 497         printk("\n");
 498
 499         runtime = __va(efi.systab->runtime);
 500         efi.get_time = phys_get_time;
 501         efi.set_time = phys_set_time;
 502         efi.get_wakeup_time = phys_get_wakeup_time;
 503         efi.set_wakeup_time = phys_set_wakeup_time;
 504         efi.get_variable = phys_get_variable;
 505         efi.get_next_variable = phys_get_next_variable;
 506         efi.set_variable = phys_set_variable;
 507         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 508         efi.reset_system = phys_reset_system;
 509
 510         efi_map_start = __va(ia64_boot_param->efi_memmap);
 511         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 512         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 513
 514 #if EFI_DEBUG
 515         /* print EFI memory map: */
 516         {
 517                 efi_memory_desc_t *md;
 518                 void *p;
 519
 520                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 521                         md = p;
 522                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 523                                i, md->type, md->attribute, md->phys_addr,
 524                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 525                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 526                 }
 527         }
 528 #endif
 529
 530         efi_map_pal_code();
 531         efi_enter_virtual_mode();
 532 }
 533
 534 void
 535 efi_enter_virtual_mode (void)
 536 {
 537         void *efi_map_start, *efi_map_end, *p;
 538         efi_memory_desc_t *md;
 539         efi_status_t status;
 540         u64 efi_desc_size;
 541
 542         efi_map_start = __va(ia64_boot_param->efi_memmap);
 543         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 544         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 545
 546         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 547                 md = p;
 548                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 549                         /*
 550                          * Some descriptors have multiple bits set, so the order of
 551                          * the tests is relevant.
 552                          */
 553                         if (md->attribute & EFI_MEMORY_WB) {
 554                                 md->virt_addr = (u64) __va(md->phys_addr);
 555                         } else if (md->attribute & EFI_MEMORY_UC) {
 556                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 557                         } else if (md->attribute & EFI_MEMORY_WC) {
 558 #if 0
 559                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 560                                                                            | _PAGE_D
 561                                                                            | _PAGE_MA_WC
 562                                                                            | _PAGE_PL_0
 563                                                                            | _PAGE_AR_RW));
 564 #else
 565                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 566                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 567 #endif
 568                         } else if (md->attribute & EFI_MEMORY_WT) {
 569 #if 0
 570                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 571                                                                            | _PAGE_D | _PAGE_MA_WT
 572                                                                            | _PAGE_PL_0
 573                                                                            | _PAGE_AR_RW));
 574 #else
 575                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 576                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 577 #endif
 578                         }
 579                 }
 580         }
 581
 582         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 583                                ia64_boot_param->efi_memmap_size,
 584                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 585                                ia64_boot_param->efi_memmap);
 586         if (status != EFI_SUCCESS) {
 587                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 588                        "(status=%lu)\n", status);
 589                 return;
 590         }
 591
 592         /*
 593          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 594          */
 595         efi.get_time = virt_get_time;
 596         efi.set_time = virt_set_time;
 597         efi.get_wakeup_time = virt_get_wakeup_time;
 598         efi.set_wakeup_time = virt_set_wakeup_time;
 599         efi.get_variable = virt_get_variable;
 600         efi.get_next_variable = virt_get_next_variable;
 601         efi.set_variable = virt_set_variable;
 602         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 603         efi.reset_system = virt_reset_system;
 604 }
 605
 606 /*
 607  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 608  * this type, other I/O port ranges should be described via ACPI.
 609  */
 610 u64
 611 efi_get_iobase (void)
 612 {
 613         void *efi_map_start, *efi_map_end, *p;
 614         efi_memory_desc_t *md;
 615         u64 efi_desc_size;
 616
 617         efi_map_start = __va(ia64_boot_param->efi_memmap);
 618         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 619         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 620
 621         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 622                 md = p;
 623                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 624                         if (md->attribute & EFI_MEMORY_UC)
 625                                 return md->phys_addr;
 626                 }
 627         }
 628         return 0;
 629 }
 630
 631 static struct kern_memdesc *
 632 kern_memory_descriptor (unsigned long phys_addr)
 633 {
 634         struct kern_memdesc *md;
 635
 636         for (md = kern_memmap; md->start != ~0UL; md++) {
 637                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 638                          return md;
 639         }
 640         return NULL;
 641 }
 642
 643 static efi_memory_desc_t *
 644 efi_memory_descriptor (unsigned long phys_addr)
 645 {
 646         void *efi_map_start, *efi_map_end, *p;
 647         efi_memory_desc_t *md;
 648         u64 efi_desc_size;
 649
 650         efi_map_start = __va(ia64_boot_param->efi_memmap);
 651         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 652         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 653
 654         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 655                 md = p;
 656
 657                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 658                          return md;
 659         }
 660         return NULL;
 661 }
 662
 663 u32
 664 efi_mem_type (unsigned long phys_addr)
 665 {
 666         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 667
 668         if (md)
 669                 return md->type;
 670         return 0;
 671 }
 672
 673 u64
 674 efi_mem_attributes (unsigned long phys_addr)
 675 {
 676         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 677
 678         if (md)
 679                 return md->attribute;
 680         return 0;
 681 }
 682 EXPORT_SYMBOL(efi_mem_attributes);
 683
 684 u64
 685 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 686 {
 687         unsigned long end = phys_addr + size;
 688         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 689         u64 attr;
 690
 691         if (!md)
 692                 return 0;
 693
 694         /*
 695          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 696          * the kernel that firmware needs this region mapped.
 697          */
 698         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 699         do {
 700                 unsigned long md_end = efi_md_end(md);
 701
 702                 if (end <= md_end)
 703                         return attr;
 704
 705                 md = efi_memory_descriptor(md_end);
 706                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 707                         return 0;
 708         } while (md);
 709         return 0;
 710 }
 711
 712 u64
 713 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 714 {
 715         unsigned long end = phys_addr + size;
 716         struct kern_memdesc *md;
 717         u64 attr;
 718
 719         /*
 720          * This is a hack for ioremap calls before we set up kern_memmap.
 721          * Maybe we should do efi_memmap_init() earlier instead.
 722          */
 723         if (!kern_memmap) {
 724                 attr = efi_mem_attribute(phys_addr, size);
 725                 if (attr & EFI_MEMORY_WB)
 726                         return EFI_MEMORY_WB;
 727                 return 0;
 728         }
 729
 730         md = kern_memory_descriptor(phys_addr);
 731         if (!md)
 732                 return 0;
 733
 734         attr = md->attribute;
 735         do {
 736                 unsigned long md_end = kmd_end(md);
 737
 738                 if (end <= md_end)
 739                         return attr;
 740
 741                 md = kern_memory_descriptor(md_end);
 742                 if (!md || md->attribute != attr)
 743                         return 0;
 744         } while (md);
 745         return 0;
 746 }
 747 EXPORT_SYMBOL(kern_mem_attribute);
 748
 749 int
 750 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 751 {
 752         u64 attr;
 753
 754         /*
 755          * /dev/mem reads and writes use copy_to_user(), which implicitly
 756          * uses a granule-sized kernel identity mapping.  It's really
 757          * only safe to do this for regions in kern_memmap.  For more
 758          * details, see Documentation/ia64/aliasing.txt.
 759          */
 760         attr = kern_mem_attribute(phys_addr, size);
 761         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 762                 return 1;
 763         return 0;
 764 }
 765
 766 int
 767 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 768 {
 769         /*
 770          * MMIO regions are often missing from the EFI memory map.
 771          * We must allow mmap of them for programs like X, so we
 772          * currently can't do any useful validation.
 773          */
 774         return 1;
 775 }
 776
 777 pgprot_t
 778 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 779                      pgprot_t vma_prot)
 780 {
 781         unsigned long phys_addr = pfn << PAGE_SHIFT;
 782         u64 attr;
 783
 784         /*
 785          * For /dev/mem mmap, we use user mappings, but if the region is
 786          * in kern_memmap (and hence may be covered by a kernel mapping),
 787          * we must use the same attribute as the kernel mapping.
 788          */
 789         attr = kern_mem_attribute(phys_addr, size);
 790         if (attr & EFI_MEMORY_WB)
 791                 return pgprot_cacheable(vma_prot);
 792         else if (attr & EFI_MEMORY_UC)
 793                 return pgprot_noncached(vma_prot);
 794
 795         /*
 796          * Some chipsets don't support UC access to memory.  If
 797          * WB is supported, we prefer that.
 798          */
 799         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 800                 return pgprot_cacheable(vma_prot);
 801
 802         return pgprot_noncached(vma_prot);
 803 }
 804
 805 int __init
 806 efi_uart_console_only(void)
 807 {
 808         efi_status_t status;
 809         char *s, name[] = "ConOut";
 810         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 811         efi_char16_t *utf16, name_utf16[32];
 812         unsigned char data[1024];
 813         unsigned long size = sizeof(data);
 814         struct efi_generic_dev_path *hdr, *end_addr;
 815         int uart = 0;
 816
 817         /* Convert to UTF-16 */
 818         utf16 = name_utf16;
 819         s = name;
 820         while (*s)
 821                 *utf16++ = *s++ & 0x7f;
 822         *utf16 = 0;
 823
 824         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 825         if (status != EFI_SUCCESS) {
 826                 printk(KERN_ERR "No EFI %s variable?\n", name);
 827                 return 0;
 828         }
 829
 830         hdr = (struct efi_generic_dev_path *) data;
 831         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 832         while (hdr < end_addr) {
 833                 if (hdr->type == EFI_DEV_MSG &&
 834                     hdr->sub_type == EFI_DEV_MSG_UART)
 835                         uart = 1;
 836                 else if (hdr->type == EFI_DEV_END_PATH ||
 837                           hdr->type == EFI_DEV_END_PATH2) {
 838                         if (!uart)
 839                                 return 0;
 840                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 841                                 return 1;
 842                         uart = 0;
 843                 }
 844                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 845         }
 846         printk(KERN_ERR "Malformed %s value\n", name);
 847         return 0;
 848 }
 849
 850 /*
 851  * Look for the first granule aligned memory descriptor memory
 852  * that is big enough to hold EFI memory map. Make sure this
 853  * descriptor is atleast granule sized so it does not get trimmed
 854  */
 855 struct kern_memdesc *
 856 find_memmap_space (void)
 857 {
 858         u64     contig_low=0, contig_high=0;
 859         u64     as = 0, ae;
 860         void *efi_map_start, *efi_map_end, *p, *q;
 861         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 862         u64     space_needed, efi_desc_size;
 863         unsigned long total_mem = 0;
 864
 865         efi_map_start = __va(ia64_boot_param->efi_memmap);
 866         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 867         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 868
 869         /*
 870          * Worst case: we need 3 kernel descriptors for each efi descriptor
 871          * (if every entry has a WB part in the middle, and UC head and tail),
 872          * plus one for the end marker.
 873          */
 874         space_needed = sizeof(kern_memdesc_t) *
 875                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 876
 877         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 878                 md = p;
 879                 if (!efi_wb(md)) {
 880                         continue;
 881                 }
 882                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 883                         contig_low = GRANULEROUNDUP(md->phys_addr);
 884                         contig_high = efi_md_end(md);
 885                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 886                                 check_md = q;
 887                                 if (!efi_wb(check_md))
 888                                         break;
 889                                 if (contig_high != check_md->phys_addr)
 890                                         break;
 891                                 contig_high = efi_md_end(check_md);
 892                         }
 893                         contig_high = GRANULEROUNDDOWN(contig_high);
 894                 }
 895                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
 896                         continue;
 897
 898                 /* Round ends inward to granule boundaries */
 899                 as = max(contig_low, md->phys_addr);
 900                 ae = min(contig_high, efi_md_end(md));
 901
 902                 /* keep within max_addr= and min_addr= command line arg */
 903                 as = max(as, min_addr);
 904                 ae = min(ae, max_addr);
 905                 if (ae <= as)
 906                         continue;
 907
 908                 /* avoid going over mem= command line arg */
 909                 if (total_mem + (ae - as) > mem_limit)
 910                         ae -= total_mem + (ae - as) - mem_limit;
 911
 912                 if (ae <= as)
 913                         continue;
 914
 915                 if (ae - as > space_needed)
 916                         break;
 917         }
 918         if (p >= efi_map_end)
 919                 panic("Can't allocate space for kernel memory descriptors");
 920
 921         return __va(as);
 922 }
 923
 924 /*
 925  * Walk the EFI memory map and gather all memory available for kernel
 926  * to use.  We can allocate partial granules only if the unavailable
 927  * parts exist, and are WB.
 928  */
 929 void
 930 efi_memmap_init(unsigned long *s, unsigned long *e)
 931 {
 932         struct kern_memdesc *k, *prev = NULL;
 933         u64     contig_low=0, contig_high=0;
 934         u64     as, ae, lim;
 935         void *efi_map_start, *efi_map_end, *p, *q;
 936         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 937         u64     efi_desc_size;
 938         unsigned long total_mem = 0;
 939
 940         k = kern_memmap = find_memmap_space();
 941
 942         efi_map_start = __va(ia64_boot_param->efi_memmap);
 943         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 944         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 945
 946         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 947                 md = p;
 948                 if (!efi_wb(md)) {
 949                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 950                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 951                                 k->attribute = EFI_MEMORY_UC;
 952                                 k->start = md->phys_addr;
 953                                 k->num_pages = md->num_pages;
 954                                 k++;
 955                         }
 956                         continue;
 957                 }
 958                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 959                         contig_low = GRANULEROUNDUP(md->phys_addr);
 960                         contig_high = efi_md_end(md);
 961                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 962                                 check_md = q;
 963                                 if (!efi_wb(check_md))
 964                                         break;
 965                                 if (contig_high != check_md->phys_addr)
 966                                         break;
 967                                 contig_high = efi_md_end(check_md);
 968                         }
 969                         contig_high = GRANULEROUNDDOWN(contig_high);
 970                 }
 971                 if (!is_memory_available(md))
 972                         continue;
 973
 974                 /*
 975                  * Round ends inward to granule boundaries
 976                  * Give trimmings to uncached allocator
 977                  */
 978                 if (md->phys_addr < contig_low) {
 979                         lim = min(efi_md_end(md), contig_low);
 980                         if (efi_uc(md)) {
 981                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
 982                                     kmd_end(k-1) == md->phys_addr) {
 983                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 984                                 } else {
 985                                         k->attribute = EFI_MEMORY_UC;
 986                                         k->start = md->phys_addr;
 987                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
 988                                         k++;
 989                                 }
 990                         }
 991                         as = contig_low;
 992                 } else
 993                         as = md->phys_addr;
 994
 995                 if (efi_md_end(md) > contig_high) {
 996                         lim = max(md->phys_addr, contig_high);
 997                         if (efi_uc(md)) {
 998                                 if (lim == md->phys_addr && k > kern_memmap &&
 999                                     (k-1)->attribute == EFI_MEMORY_UC &&
1000                                     kmd_end(k-1) == md->phys_addr) {
1001                                         (k-1)->num_pages += md->num_pages;
1002                                 } else {
1003                                         k->attribute = EFI_MEMORY_UC;
1004                                         k->start = lim;
1005                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
1006                                         k++;
1007                                 }
1008                         }
1009                         ae = contig_high;
1010                 } else
1011                         ae = efi_md_end(md);
1012
1013                 /* keep within max_addr= and min_addr= command line arg */
1014                 as = max(as, min_addr);
1015                 ae = min(ae, max_addr);
1016                 if (ae <= as)
1017                         continue;
1018
1019                 /* avoid going over mem= command line arg */
1020                 if (total_mem + (ae - as) > mem_limit)
1021                         ae -= total_mem + (ae - as) - mem_limit;
1022
1023                 if (ae <= as)
1024                         continue;
1025                 if (prev && kmd_end(prev) == md->phys_addr) {
1026                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1027                         total_mem += ae - as;
1028                         continue;
1029                 }
1030                 k->attribute = EFI_MEMORY_WB;
1031                 k->start = as;
1032                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1033                 total_mem += ae - as;
1034                 prev = k++;
1035         }
1036         k->start = ~0L; /* end-marker */
1037
1038         /* reserve the memory we are using for kern_memmap */
1039         *s = (u64)kern_memmap;
1040         *e = (u64)++k;
1041 }
1042
1043 void
1044 efi_initialize_iomem_resources(struct resource *code_resource,
1045                                struct resource *data_resource)
1046 {
1047         struct resource *res;
1048         void *efi_map_start, *efi_map_end, *p;
1049         efi_memory_desc_t *md;
1050         u64 efi_desc_size;
1051         char *name;
1052         unsigned long flags;
1053
1054         efi_map_start = __va(ia64_boot_param->efi_memmap);
1055         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1056         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1057
1058         res = NULL;
1059
1060         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1061                 md = p;
1062
1063                 if (md->num_pages == 0) /* should not happen */
1064                         continue;
1065
1066                 flags = IORESOURCE_MEM;
1067                 switch (md->type) {
1068
1069                         case EFI_MEMORY_MAPPED_IO:
1070                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1071                                 continue;
1072
1073                         case EFI_LOADER_CODE:
1074                         case EFI_LOADER_DATA:
1075                         case EFI_BOOT_SERVICES_DATA:
1076                         case EFI_BOOT_SERVICES_CODE:
1077                         case EFI_CONVENTIONAL_MEMORY:
1078                                 if (md->attribute & EFI_MEMORY_WP) {
1079                                         name = "System ROM";
1080                                         flags |= IORESOURCE_READONLY;
1081                                 } else {
1082                                         name = "System RAM";
1083                                 }
1084                                 break;
1085
1086                         case EFI_ACPI_MEMORY_NVS:
1087                                 name = "ACPI Non-volatile Storage";
1088                                 flags |= IORESOURCE_BUSY;
1089                                 break;
1090
1091                         case EFI_UNUSABLE_MEMORY:
1092                                 name = "reserved";
1093                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1094                                 break;
1095
1096                         case EFI_RESERVED_TYPE:
1097                         case EFI_RUNTIME_SERVICES_CODE:
1098                         case EFI_RUNTIME_SERVICES_DATA:
1099                         case EFI_ACPI_RECLAIM_MEMORY:
1100                         default:
1101                                 name = "reserved";
1102                                 flags |= IORESOURCE_BUSY;
1103                                 break;
1104                 }
1105
1106                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1107                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1108                         return;
1109                 }
1110
1111                 res->name = name;
1112                 res->start = md->phys_addr;
1113                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1114                 res->flags = flags;
1115
1116                 if (insert_resource(&iomem_resource, res) < 0)
1117                         kfree(res);
1118                 else {
1119                         /*
1120                          * We don't know which region contains
1121                          * kernel data so we try it repeatedly and
1122                          * let the resource manager test it.
1123                          */
1124                         insert_resource(res, code_resource);
1125                         insert_resource(res, data_resource);
1126 #ifdef CONFIG_KEXEC
1127                         insert_resource(res, &efi_memmap_res);
1128                         insert_resource(res, &boot_param_res);
1129                         if (crashk_res.end > crashk_res.start)
1130                                 insert_resource(res, &crashk_res);
1131 #endif
1132                 }
1133         }
1134 }
1135
1136 #ifdef CONFIG_KEXEC
1137 /* find a block of memory aligned to 64M exclude reserved regions
1138    rsvd_regions are sorted
1139  */
1140 unsigned long
1141 kdump_find_rsvd_region (unsigned long size,
1142                 struct rsvd_region *r, int n)
1143 {
1144   int i;
1145   u64 start, end;
1146   u64 alignment = 1UL << _PAGE_SIZE_64M;
1147   void *efi_map_start, *efi_map_end, *p;
1148   efi_memory_desc_t *md;
1149   u64 efi_desc_size;
1150
1151   efi_map_start = __va(ia64_boot_param->efi_memmap);
1152   efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1153   efi_desc_size = ia64_boot_param->efi_memdesc_size;
1154
1155   for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1156           md = p;
1157           if (!efi_wb(md))
1158                   continue;
1159           start = ALIGN(md->phys_addr, alignment);
1160           end = efi_md_end(md);
1161           for (i = 0; i < n; i++) {
1162                 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1163                         if (__pa(r[i].start) > start + size)
1164                                 return start;
1165                         start = ALIGN(__pa(r[i].end), alignment);
1166                         if (i < n-1 && __pa(r[i+1].start) < start + size)
1167                                 continue;
1168                         else
1169                                 break;
1170                 }
1171           }
1172           if (end > start + size)
1173                 return start;
1174   }
1175
1176   printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
1177         size);
1178   return ~0UL;
1179 }
1180 #endif