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/bootmem.h>
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/types.h>
  28 #include <linux/time.h>
  29 #include <linux/efi.h>
  30 #include <linux/kexec.h>
  31 #include <linux/mm.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/kregs.h>
  35 #include <asm/meminit.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/processor.h>
  38 #include <asm/mca.h>
  39
  40 #define EFI_DEBUG       0
  41
  42 extern efi_status_t efi_call_phys (void *, ...);
  43
  44 struct efi efi;
  45 EXPORT_SYMBOL(efi);
  46 static efi_runtime_services_t *runtime;
  47 static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  48
  49 #define efi_call_virt(f, args...)       (*(f))(args)
  50
  51 #define STUB_GET_TIME(prefix, adjust_arg)                                                         \
  52 static efi_status_t                                                                               \
  53 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                            \
  54 {                                                                                                 \
  55         struct ia64_fpreg fr[6];                                                                  \
  56         efi_time_cap_t *atc = NULL;                                                               \
  57         efi_status_t ret;                                                                         \
  58                                                                                                   \
  59         if (tc)                                                                                   \
  60                 atc = adjust_arg(tc);                                                             \
  61         ia64_save_scratch_fpregs(fr);                                                             \
  62         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
  63         ia64_load_scratch_fpregs(fr);                                                             \
  64         return ret;                                                                               \
  65 }
  66
  67 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  68 static efi_status_t                                                                             \
  69 prefix##_set_time (efi_time_t *tm)                                                              \
  70 {                                                                                               \
  71         struct ia64_fpreg fr[6];                                                                \
  72         efi_status_t ret;                                                                       \
  73                                                                                                 \
  74         ia64_save_scratch_fpregs(fr);                                                           \
  75         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  76         ia64_load_scratch_fpregs(fr);                                                           \
  77         return ret;                                                                             \
  78 }
  79
  80 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  81 static efi_status_t                                                                             \
  82 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  83 {                                                                                               \
  84         struct ia64_fpreg fr[6];                                                                \
  85         efi_status_t ret;                                                                       \
  86                                                                                                 \
  87         ia64_save_scratch_fpregs(fr);                                                           \
  88         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  89                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  90         ia64_load_scratch_fpregs(fr);                                                           \
  91         return ret;                                                                             \
  92 }
  93
  94 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  95 static efi_status_t                                                                             \
  96 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
  97 {                                                                                               \
  98         struct ia64_fpreg fr[6];                                                                \
  99         efi_time_t *atm = NULL;                                                                 \
 100         efi_status_t ret;                                                                       \
 101                                                                                                 \
 102         if (tm)                                                                                 \
 103                 atm = adjust_arg(tm);                                                           \
 104         ia64_save_scratch_fpregs(fr);                                                           \
 105         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 106                                 enabled, atm);                                                  \
 107         ia64_load_scratch_fpregs(fr);                                                           \
 108         return ret;                                                                             \
 109 }
 110
 111 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 112 static efi_status_t                                                                     \
 113 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 114                        unsigned long *data_size, void *data)                            \
 115 {                                                                                       \
 116         struct ia64_fpreg fr[6];                                                        \
 117         u32 *aattr = NULL;                                                                      \
 118         efi_status_t ret;                                                               \
 119                                                                                         \
 120         if (attr)                                                                       \
 121                 aattr = adjust_arg(attr);                                               \
 122         ia64_save_scratch_fpregs(fr);                                                   \
 123         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 124                                 adjust_arg(name), adjust_arg(vendor), aattr,            \
 125                                 adjust_arg(data_size), adjust_arg(data));               \
 126         ia64_load_scratch_fpregs(fr);                                                   \
 127         return ret;                                                                     \
 128 }
 129
 130 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 131 static efi_status_t                                                                             \
 132 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 133 {                                                                                               \
 134         struct ia64_fpreg fr[6];                                                                \
 135         efi_status_t ret;                                                                       \
 136                                                                                                 \
 137         ia64_save_scratch_fpregs(fr);                                                           \
 138         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 139                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 140         ia64_load_scratch_fpregs(fr);                                                           \
 141         return ret;                                                                             \
 142 }
 143
 144 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 145 static efi_status_t                                                                     \
 146 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr,      \
 147                        unsigned long data_size, void *data)                             \
 148 {                                                                                       \
 149         struct ia64_fpreg fr[6];                                                        \
 150         efi_status_t ret;                                                               \
 151                                                                                         \
 152         ia64_save_scratch_fpregs(fr);                                                   \
 153         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 154                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 155                                 adjust_arg(data));                                      \
 156         ia64_load_scratch_fpregs(fr);                                                   \
 157         return ret;                                                                     \
 158 }
 159
 160 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 161 static efi_status_t                                                                             \
 162 prefix##_get_next_high_mono_count (u32 *count)                                                  \
 163 {                                                                                               \
 164         struct ia64_fpreg fr[6];                                                                \
 165         efi_status_t ret;                                                                       \
 166                                                                                                 \
 167         ia64_save_scratch_fpregs(fr);                                                           \
 168         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 169                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 170         ia64_load_scratch_fpregs(fr);                                                           \
 171         return ret;                                                                             \
 172 }
 173
 174 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 175 static void                                                                     \
 176 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 177                        unsigned long data_size, efi_char16_t *data)             \
 178 {                                                                               \
 179         struct ia64_fpreg fr[6];                                                \
 180         efi_char16_t *adata = NULL;                                             \
 181                                                                                 \
 182         if (data)                                                               \
 183                 adata = adjust_arg(data);                                       \
 184                                                                                 \
 185         ia64_save_scratch_fpregs(fr);                                           \
 186         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 187                           reset_type, status, data_size, adata);                \
 188         /* should not return, but just in case... */                            \
 189         ia64_load_scratch_fpregs(fr);                                           \
 190 }
 191
 192 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 193
 194 STUB_GET_TIME(phys, phys_ptr)
 195 STUB_SET_TIME(phys, phys_ptr)
 196 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 197 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 198 STUB_GET_VARIABLE(phys, phys_ptr)
 199 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 200 STUB_SET_VARIABLE(phys, phys_ptr)
 201 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 202 STUB_RESET_SYSTEM(phys, phys_ptr)
 203
 204 #define id(arg) arg
 205
 206 STUB_GET_TIME(virt, id)
 207 STUB_SET_TIME(virt, id)
 208 STUB_GET_WAKEUP_TIME(virt, id)
 209 STUB_SET_WAKEUP_TIME(virt, id)
 210 STUB_GET_VARIABLE(virt, id)
 211 STUB_GET_NEXT_VARIABLE(virt, id)
 212 STUB_SET_VARIABLE(virt, id)
 213 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 214 STUB_RESET_SYSTEM(virt, id)
 215
 216 void
 217 efi_gettimeofday (struct timespec *ts)
 218 {
 219         efi_time_t tm;
 220
 221         memset(ts, 0, sizeof(ts));
 222         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
 223                 return;
 224
 225         ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 226         ts->tv_nsec = tm.nanosecond;
 227 }
 228
 229 static int
 230 is_memory_available (efi_memory_desc_t *md)
 231 {
 232         if (!(md->attribute & EFI_MEMORY_WB))
 233                 return 0;
 234
 235         switch (md->type) {
 236               case EFI_LOADER_CODE:
 237               case EFI_LOADER_DATA:
 238               case EFI_BOOT_SERVICES_CODE:
 239               case EFI_BOOT_SERVICES_DATA:
 240               case EFI_CONVENTIONAL_MEMORY:
 241                 return 1;
 242         }
 243         return 0;
 244 }
 245
 246 typedef struct kern_memdesc {
 247         u64 attribute;
 248         u64 start;
 249         u64 num_pages;
 250 } kern_memdesc_t;
 251
 252 static kern_memdesc_t *kern_memmap;
 253
 254 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 255
 256 static inline u64
 257 kmd_end(kern_memdesc_t *kmd)
 258 {
 259         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 260 }
 261
 262 static inline u64
 263 efi_md_end(efi_memory_desc_t *md)
 264 {
 265         return (md->phys_addr + efi_md_size(md));
 266 }
 267
 268 static inline int
 269 efi_wb(efi_memory_desc_t *md)
 270 {
 271         return (md->attribute & EFI_MEMORY_WB);
 272 }
 273
 274 static inline int
 275 efi_uc(efi_memory_desc_t *md)
 276 {
 277         return (md->attribute & EFI_MEMORY_UC);
 278 }
 279
 280 static void
 281 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 282 {
 283         kern_memdesc_t *k;
 284         u64 start, end, voff;
 285
 286         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 287         for (k = kern_memmap; k->start != ~0UL; k++) {
 288                 if (k->attribute != attr)
 289                         continue;
 290                 start = PAGE_ALIGN(k->start);
 291                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 292                 if (start < end)
 293                         if ((*callback)(start + voff, end + voff, arg) < 0)
 294                                 return;
 295         }
 296 }
 297
 298 /*
 299  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 300  * has memory that is available for OS use.
 301  */
 302 void
 303 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 304 {
 305         walk(callback, arg, EFI_MEMORY_WB);
 306 }
 307
 308 /*
 309  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 310  * has memory that is available for uncached allocator.
 311  */
 312 void
 313 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 314 {
 315         walk(callback, arg, EFI_MEMORY_UC);
 316 }
 317
 318 /*
 319  * Look for the PAL_CODE region reported by EFI and maps it using an
 320  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 321  * Abstraction Layer chapter 11 in ADAG
 322  */
 323
 324 void *
 325 efi_get_pal_addr (void)
 326 {
 327         void *efi_map_start, *efi_map_end, *p;
 328         efi_memory_desc_t *md;
 329         u64 efi_desc_size;
 330         int pal_code_count = 0;
 331         u64 vaddr, mask;
 332
 333         efi_map_start = __va(ia64_boot_param->efi_memmap);
 334         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 335         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 336
 337         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 338                 md = p;
 339                 if (md->type != EFI_PAL_CODE)
 340                         continue;
 341
 342                 if (++pal_code_count > 1) {
 343                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 344                                md->phys_addr);
 345                         continue;
 346                 }
 347                 /*
 348                  * The only ITLB entry in region 7 that is used is the one installed by
 349                  * __start().  That entry covers a 64MB range.
 350                  */
 351                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 352                 vaddr = PAGE_OFFSET + md->phys_addr;
 353
 354                 /*
 355                  * We must check that the PAL mapping won't overlap with the kernel
 356                  * mapping.
 357                  *
 358                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 359                  * 256KB and that only one ITR is needed to map it. This implies that the
 360                  * PAL code is always aligned on its size, i.e., the closest matching page
 361                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 362                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 363                  * now the following test is enough to determine whether or not we need a
 364                  * dedicated ITR for the PAL code.
 365                  */
 366                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 367                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 368                                __FUNCTION__);
 369                         continue;
 370                 }
 371
 372                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 373                         panic("Woah!  PAL code size bigger than a granule!");
 374
 375 #if EFI_DEBUG
 376                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 377
 378                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 379                         smp_processor_id(), md->phys_addr,
 380                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 381                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 382 #endif
 383                 return __va(md->phys_addr);
 384         }
 385         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 386                __FUNCTION__);
 387         return NULL;
 388 }
 389
 390 void
 391 efi_map_pal_code (void)
 392 {
 393         void *pal_vaddr = efi_get_pal_addr ();
 394         u64 psr;
 395
 396         if (!pal_vaddr)
 397                 return;
 398
 399         /*
 400          * Cannot write to CRx with PSR.ic=1
 401          */
 402         psr = ia64_clear_ic();
 403         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 404                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 405                  IA64_GRANULE_SHIFT);
 406         ia64_set_psr(psr);              /* restore psr */
 407         ia64_srlz_i();
 408 }
 409
 410 void __init
 411 efi_init (void)
 412 {
 413         void *efi_map_start, *efi_map_end;
 414         efi_config_table_t *config_tables;
 415         efi_char16_t *c16;
 416         u64 efi_desc_size;
 417         char *cp, vendor[100] = "unknown";
 418         int i;
 419
 420         /* it's too early to be able to use the standard kernel command line support... */
 421         for (cp = boot_command_line; *cp; ) {
 422                 if (memcmp(cp, "mem=", 4) == 0) {
 423                         mem_limit = memparse(cp + 4, &cp);
 424                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 425                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 426                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 427                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 428                 } else {
 429                         while (*cp != ' ' && *cp)
 430                                 ++cp;
 431                         while (*cp == ' ')
 432                                 ++cp;
 433                 }
 434         }
 435         if (min_addr != 0UL)
 436                 printk(KERN_INFO "Ignoring memory below %luMB\n", min_addr >> 20);
 437         if (max_addr != ~0UL)
 438                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 439
 440         efi.systab = __va(ia64_boot_param->efi_systab);
 441
 442         /*
 443          * Verify the EFI Table
 444          */
 445         if (efi.systab == NULL)
 446                 panic("Woah! Can't find EFI system table.\n");
 447         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 448                 panic("Woah! EFI system table signature incorrect\n");
 449         if ((efi.systab->hdr.revision >> 16) == 0)
 450                 printk(KERN_WARNING "Warning: EFI system table version "
 451                        "%d.%02d, expected 1.00 or greater\n",
 452                        efi.systab->hdr.revision >> 16,
 453                        efi.systab->hdr.revision & 0xffff);
 454
 455         config_tables = __va(efi.systab->tables);
 456
 457         /* Show what we know for posterity */
 458         c16 = __va(efi.systab->fw_vendor);
 459         if (c16) {
 460                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 461                         vendor[i] = *c16++;
 462                 vendor[i] = '\0';
 463         }
 464
 465         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 466                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 467
 468         efi.mps        = EFI_INVALID_TABLE_ADDR;
 469         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 470         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 471         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 472         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 473         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 474         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 475         efi.uga        = EFI_INVALID_TABLE_ADDR;
 476
 477         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 478                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 479                         efi.mps = config_tables[i].table;
 480                         printk(" MPS=0x%lx", config_tables[i].table);
 481                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 482                         efi.acpi20 = config_tables[i].table;
 483                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 484                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 485                         efi.acpi = config_tables[i].table;
 486                         printk(" ACPI=0x%lx", config_tables[i].table);
 487                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 488                         efi.smbios = config_tables[i].table;
 489                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 490                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 491                         efi.sal_systab = config_tables[i].table;
 492                         printk(" SALsystab=0x%lx", config_tables[i].table);
 493                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 494                         efi.hcdp = config_tables[i].table;
 495                         printk(" HCDP=0x%lx", config_tables[i].table);
 496                 }
 497         }
 498         printk("\n");
 499
 500         runtime = __va(efi.systab->runtime);
 501         efi.get_time = phys_get_time;
 502         efi.set_time = phys_set_time;
 503         efi.get_wakeup_time = phys_get_wakeup_time;
 504         efi.set_wakeup_time = phys_set_wakeup_time;
 505         efi.get_variable = phys_get_variable;
 506         efi.get_next_variable = phys_get_next_variable;
 507         efi.set_variable = phys_set_variable;
 508         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 509         efi.reset_system = phys_reset_system;
 510
 511         efi_map_start = __va(ia64_boot_param->efi_memmap);
 512         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 513         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 514
 515 #if EFI_DEBUG
 516         /* print EFI memory map: */
 517         {
 518                 efi_memory_desc_t *md;
 519                 void *p;
 520
 521                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 522                         md = p;
 523                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 524                                i, md->type, md->attribute, md->phys_addr,
 525                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 526                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 527                 }
 528         }
 529 #endif
 530
 531         efi_map_pal_code();
 532         efi_enter_virtual_mode();
 533 }
 534
 535 void
 536 efi_enter_virtual_mode (void)
 537 {
 538         void *efi_map_start, *efi_map_end, *p;
 539         efi_memory_desc_t *md;
 540         efi_status_t status;
 541         u64 efi_desc_size;
 542
 543         efi_map_start = __va(ia64_boot_param->efi_memmap);
 544         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 545         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 546
 547         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 548                 md = p;
 549                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 550                         /*
 551                          * Some descriptors have multiple bits set, so the order of
 552                          * the tests is relevant.
 553                          */
 554                         if (md->attribute & EFI_MEMORY_WB) {
 555                                 md->virt_addr = (u64) __va(md->phys_addr);
 556                         } else if (md->attribute & EFI_MEMORY_UC) {
 557                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 558                         } else if (md->attribute & EFI_MEMORY_WC) {
 559 #if 0
 560                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 561                                                                            | _PAGE_D
 562                                                                            | _PAGE_MA_WC
 563                                                                            | _PAGE_PL_0
 564                                                                            | _PAGE_AR_RW));
 565 #else
 566                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 567                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 568 #endif
 569                         } else if (md->attribute & EFI_MEMORY_WT) {
 570 #if 0
 571                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 572                                                                            | _PAGE_D | _PAGE_MA_WT
 573                                                                            | _PAGE_PL_0
 574                                                                            | _PAGE_AR_RW));
 575 #else
 576                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 577                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 578 #endif
 579                         }
 580                 }
 581         }
 582
 583         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 584                                ia64_boot_param->efi_memmap_size,
 585                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 586                                ia64_boot_param->efi_memmap);
 587         if (status != EFI_SUCCESS) {
 588                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 589                        "(status=%lu)\n", status);
 590                 return;
 591         }
 592
 593         /*
 594          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 595          */
 596         efi.get_time = virt_get_time;
 597         efi.set_time = virt_set_time;
 598         efi.get_wakeup_time = virt_get_wakeup_time;
 599         efi.set_wakeup_time = virt_set_wakeup_time;
 600         efi.get_variable = virt_get_variable;
 601         efi.get_next_variable = virt_get_next_variable;
 602         efi.set_variable = virt_set_variable;
 603         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 604         efi.reset_system = virt_reset_system;
 605 }
 606
 607 /*
 608  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 609  * this type, other I/O port ranges should be described via ACPI.
 610  */
 611 u64
 612 efi_get_iobase (void)
 613 {
 614         void *efi_map_start, *efi_map_end, *p;
 615         efi_memory_desc_t *md;
 616         u64 efi_desc_size;
 617
 618         efi_map_start = __va(ia64_boot_param->efi_memmap);
 619         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 620         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 621
 622         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 623                 md = p;
 624                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 625                         if (md->attribute & EFI_MEMORY_UC)
 626                                 return md->phys_addr;
 627                 }
 628         }
 629         return 0;
 630 }
 631
 632 static struct kern_memdesc *
 633 kern_memory_descriptor (unsigned long phys_addr)
 634 {
 635         struct kern_memdesc *md;
 636
 637         for (md = kern_memmap; md->start != ~0UL; md++) {
 638                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 639                          return md;
 640         }
 641         return NULL;
 642 }
 643
 644 static efi_memory_desc_t *
 645 efi_memory_descriptor (unsigned long phys_addr)
 646 {
 647         void *efi_map_start, *efi_map_end, *p;
 648         efi_memory_desc_t *md;
 649         u64 efi_desc_size;
 650
 651         efi_map_start = __va(ia64_boot_param->efi_memmap);
 652         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 653         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 654
 655         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 656                 md = p;
 657
 658                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 659                          return md;
 660         }
 661         return NULL;
 662 }
 663
 664 static int
 665 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 666 {
 667         void *efi_map_start, *efi_map_end, *p;
 668         efi_memory_desc_t *md;
 669         u64 efi_desc_size;
 670         unsigned long end;
 671
 672         efi_map_start = __va(ia64_boot_param->efi_memmap);
 673         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 674         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 675
 676         end = phys_addr + size;
 677
 678         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 679                 md = p;
 680
 681                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 682                         return 1;
 683         }
 684         return 0;
 685 }
 686
 687 u32
 688 efi_mem_type (unsigned long phys_addr)
 689 {
 690         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 691
 692         if (md)
 693                 return md->type;
 694         return 0;
 695 }
 696
 697 u64
 698 efi_mem_attributes (unsigned long phys_addr)
 699 {
 700         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 701
 702         if (md)
 703                 return md->attribute;
 704         return 0;
 705 }
 706 EXPORT_SYMBOL(efi_mem_attributes);
 707
 708 u64
 709 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 710 {
 711         unsigned long end = phys_addr + size;
 712         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 713         u64 attr;
 714
 715         if (!md)
 716                 return 0;
 717
 718         /*
 719          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 720          * the kernel that firmware needs this region mapped.
 721          */
 722         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 723         do {
 724                 unsigned long md_end = efi_md_end(md);
 725
 726                 if (end <= md_end)
 727                         return attr;
 728
 729                 md = efi_memory_descriptor(md_end);
 730                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 731                         return 0;
 732         } while (md);
 733         return 0;
 734 }
 735
 736 u64
 737 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 738 {
 739         unsigned long end = phys_addr + size;
 740         struct kern_memdesc *md;
 741         u64 attr;
 742
 743         /*
 744          * This is a hack for ioremap calls before we set up kern_memmap.
 745          * Maybe we should do efi_memmap_init() earlier instead.
 746          */
 747         if (!kern_memmap) {
 748                 attr = efi_mem_attribute(phys_addr, size);
 749                 if (attr & EFI_MEMORY_WB)
 750                         return EFI_MEMORY_WB;
 751                 return 0;
 752         }
 753
 754         md = kern_memory_descriptor(phys_addr);
 755         if (!md)
 756                 return 0;
 757
 758         attr = md->attribute;
 759         do {
 760                 unsigned long md_end = kmd_end(md);
 761
 762                 if (end <= md_end)
 763                         return attr;
 764
 765                 md = kern_memory_descriptor(md_end);
 766                 if (!md || md->attribute != attr)
 767                         return 0;
 768         } while (md);
 769         return 0;
 770 }
 771 EXPORT_SYMBOL(kern_mem_attribute);
 772
 773 int
 774 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 775 {
 776         u64 attr;
 777
 778         /*
 779          * /dev/mem reads and writes use copy_to_user(), which implicitly
 780          * uses a granule-sized kernel identity mapping.  It's really
 781          * only safe to do this for regions in kern_memmap.  For more
 782          * details, see Documentation/ia64/aliasing.txt.
 783          */
 784         attr = kern_mem_attribute(phys_addr, size);
 785         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 786                 return 1;
 787         return 0;
 788 }
 789
 790 int
 791 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 792 {
 793         unsigned long phys_addr = pfn << PAGE_SHIFT;
 794         u64 attr;
 795
 796         attr = efi_mem_attribute(phys_addr, size);
 797
 798         /*
 799          * /dev/mem mmap uses normal user pages, so we don't need the entire
 800          * granule, but the entire region we're mapping must support the same
 801          * attribute.
 802          */
 803         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 804                 return 1;
 805
 806         /*
 807          * Intel firmware doesn't tell us about all the MMIO regions, so
 808          * in general we have to allow mmap requests.  But if EFI *does*
 809          * tell us about anything inside this region, we should deny it.
 810          * The user can always map a smaller region to avoid the overlap.
 811          */
 812         if (efi_memmap_intersects(phys_addr, size))
 813                 return 0;
 814
 815         return 1;
 816 }
 817
 818 pgprot_t
 819 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 820                      pgprot_t vma_prot)
 821 {
 822         unsigned long phys_addr = pfn << PAGE_SHIFT;
 823         u64 attr;
 824
 825         /*
 826          * For /dev/mem mmap, we use user mappings, but if the region is
 827          * in kern_memmap (and hence may be covered by a kernel mapping),
 828          * we must use the same attribute as the kernel mapping.
 829          */
 830         attr = kern_mem_attribute(phys_addr, size);
 831         if (attr & EFI_MEMORY_WB)
 832                 return pgprot_cacheable(vma_prot);
 833         else if (attr & EFI_MEMORY_UC)
 834                 return pgprot_noncached(vma_prot);
 835
 836         /*
 837          * Some chipsets don't support UC access to memory.  If
 838          * WB is supported, we prefer that.
 839          */
 840         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 841                 return pgprot_cacheable(vma_prot);
 842
 843         return pgprot_noncached(vma_prot);
 844 }
 845
 846 int __init
 847 efi_uart_console_only(void)
 848 {
 849         efi_status_t status;
 850         char *s, name[] = "ConOut";
 851         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 852         efi_char16_t *utf16, name_utf16[32];
 853         unsigned char data[1024];
 854         unsigned long size = sizeof(data);
 855         struct efi_generic_dev_path *hdr, *end_addr;
 856         int uart = 0;
 857
 858         /* Convert to UTF-16 */
 859         utf16 = name_utf16;
 860         s = name;
 861         while (*s)
 862                 *utf16++ = *s++ & 0x7f;
 863         *utf16 = 0;
 864
 865         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 866         if (status != EFI_SUCCESS) {
 867                 printk(KERN_ERR "No EFI %s variable?\n", name);
 868                 return 0;
 869         }
 870
 871         hdr = (struct efi_generic_dev_path *) data;
 872         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 873         while (hdr < end_addr) {
 874                 if (hdr->type == EFI_DEV_MSG &&
 875                     hdr->sub_type == EFI_DEV_MSG_UART)
 876                         uart = 1;
 877                 else if (hdr->type == EFI_DEV_END_PATH ||
 878                           hdr->type == EFI_DEV_END_PATH2) {
 879                         if (!uart)
 880                                 return 0;
 881                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 882                                 return 1;
 883                         uart = 0;
 884                 }
 885                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 886         }
 887         printk(KERN_ERR "Malformed %s value\n", name);
 888         return 0;
 889 }
 890
 891 /*
 892  * Look for the first granule aligned memory descriptor memory
 893  * that is big enough to hold EFI memory map. Make sure this
 894  * descriptor is atleast granule sized so it does not get trimmed
 895  */
 896 struct kern_memdesc *
 897 find_memmap_space (void)
 898 {
 899         u64     contig_low=0, contig_high=0;
 900         u64     as = 0, ae;
 901         void *efi_map_start, *efi_map_end, *p, *q;
 902         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 903         u64     space_needed, efi_desc_size;
 904         unsigned long total_mem = 0;
 905
 906         efi_map_start = __va(ia64_boot_param->efi_memmap);
 907         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 908         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 909
 910         /*
 911          * Worst case: we need 3 kernel descriptors for each efi descriptor
 912          * (if every entry has a WB part in the middle, and UC head and tail),
 913          * plus one for the end marker.
 914          */
 915         space_needed = sizeof(kern_memdesc_t) *
 916                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 917
 918         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 919                 md = p;
 920                 if (!efi_wb(md)) {
 921                         continue;
 922                 }
 923                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 924                         contig_low = GRANULEROUNDUP(md->phys_addr);
 925                         contig_high = efi_md_end(md);
 926                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 927                                 check_md = q;
 928                                 if (!efi_wb(check_md))
 929                                         break;
 930                                 if (contig_high != check_md->phys_addr)
 931                                         break;
 932                                 contig_high = efi_md_end(check_md);
 933                         }
 934                         contig_high = GRANULEROUNDDOWN(contig_high);
 935                 }
 936                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
 937                         continue;
 938
 939                 /* Round ends inward to granule boundaries */
 940                 as = max(contig_low, md->phys_addr);
 941                 ae = min(contig_high, efi_md_end(md));
 942
 943                 /* keep within max_addr= and min_addr= command line arg */
 944                 as = max(as, min_addr);
 945                 ae = min(ae, max_addr);
 946                 if (ae <= as)
 947                         continue;
 948
 949                 /* avoid going over mem= command line arg */
 950                 if (total_mem + (ae - as) > mem_limit)
 951                         ae -= total_mem + (ae - as) - mem_limit;
 952
 953                 if (ae <= as)
 954                         continue;
 955
 956                 if (ae - as > space_needed)
 957                         break;
 958         }
 959         if (p >= efi_map_end)
 960                 panic("Can't allocate space for kernel memory descriptors");
 961
 962         return __va(as);
 963 }
 964
 965 /*
 966  * Walk the EFI memory map and gather all memory available for kernel
 967  * to use.  We can allocate partial granules only if the unavailable
 968  * parts exist, and are WB.
 969  */
 970 unsigned long
 971 efi_memmap_init(unsigned long *s, unsigned long *e)
 972 {
 973         struct kern_memdesc *k, *prev = NULL;
 974         u64     contig_low=0, contig_high=0;
 975         u64     as, ae, lim;
 976         void *efi_map_start, *efi_map_end, *p, *q;
 977         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 978         u64     efi_desc_size;
 979         unsigned long total_mem = 0;
 980
 981         k = kern_memmap = find_memmap_space();
 982
 983         efi_map_start = __va(ia64_boot_param->efi_memmap);
 984         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 985         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 986
 987         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 988                 md = p;
 989                 if (!efi_wb(md)) {
 990                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 991                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 992                                 k->attribute = EFI_MEMORY_UC;
 993                                 k->start = md->phys_addr;
 994                                 k->num_pages = md->num_pages;
 995                                 k++;
 996                         }
 997                         continue;
 998                 }
 999                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
1000                         contig_low = GRANULEROUNDUP(md->phys_addr);
1001                         contig_high = efi_md_end(md);
1002                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
1003                                 check_md = q;
1004                                 if (!efi_wb(check_md))
1005                                         break;
1006                                 if (contig_high != check_md->phys_addr)
1007                                         break;
1008                                 contig_high = efi_md_end(check_md);
1009                         }
1010                         contig_high = GRANULEROUNDDOWN(contig_high);
1011                 }
1012                 if (!is_memory_available(md))
1013                         continue;
1014
1015 #ifdef CONFIG_CRASH_DUMP
1016                 /* saved_max_pfn should ignore max_addr= command line arg */
1017                 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1018                         saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1019 #endif
1020                 /*
1021                  * Round ends inward to granule boundaries
1022                  * Give trimmings to uncached allocator
1023                  */
1024                 if (md->phys_addr < contig_low) {
1025                         lim = min(efi_md_end(md), contig_low);
1026                         if (efi_uc(md)) {
1027                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
1028                                     kmd_end(k-1) == md->phys_addr) {
1029                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
1030                                 } else {
1031                                         k->attribute = EFI_MEMORY_UC;
1032                                         k->start = md->phys_addr;
1033                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
1034                                         k++;
1035                                 }
1036                         }
1037                         as = contig_low;
1038                 } else
1039                         as = md->phys_addr;
1040
1041                 if (efi_md_end(md) > contig_high) {
1042                         lim = max(md->phys_addr, contig_high);
1043                         if (efi_uc(md)) {
1044                                 if (lim == md->phys_addr && k > kern_memmap &&
1045                                     (k-1)->attribute == EFI_MEMORY_UC &&
1046                                     kmd_end(k-1) == md->phys_addr) {
1047                                         (k-1)->num_pages += md->num_pages;
1048                                 } else {
1049                                         k->attribute = EFI_MEMORY_UC;
1050                                         k->start = lim;
1051                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
1052                                         k++;
1053                                 }
1054                         }
1055                         ae = contig_high;
1056                 } else
1057                         ae = efi_md_end(md);
1058
1059                 /* keep within max_addr= and min_addr= command line arg */
1060                 as = max(as, min_addr);
1061                 ae = min(ae, max_addr);
1062                 if (ae <= as)
1063                         continue;
1064
1065                 /* avoid going over mem= command line arg */
1066                 if (total_mem + (ae - as) > mem_limit)
1067                         ae -= total_mem + (ae - as) - mem_limit;
1068
1069                 if (ae <= as)
1070                         continue;
1071                 if (prev && kmd_end(prev) == md->phys_addr) {
1072                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1073                         total_mem += ae - as;
1074                         continue;
1075                 }
1076                 k->attribute = EFI_MEMORY_WB;
1077                 k->start = as;
1078                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1079                 total_mem += ae - as;
1080                 prev = k++;
1081         }
1082         k->start = ~0L; /* end-marker */
1083
1084         /* reserve the memory we are using for kern_memmap */
1085         *s = (u64)kern_memmap;
1086         *e = (u64)++k;
1087
1088         return total_mem;
1089 }
1090
1091 void
1092 efi_initialize_iomem_resources(struct resource *code_resource,
1093                                struct resource *data_resource,
1094                                struct resource *bss_resource)
1095 {
1096         struct resource *res;
1097         void *efi_map_start, *efi_map_end, *p;
1098         efi_memory_desc_t *md;
1099         u64 efi_desc_size;
1100         char *name;
1101         unsigned long flags;
1102
1103         efi_map_start = __va(ia64_boot_param->efi_memmap);
1104         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1105         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1106
1107         res = NULL;
1108
1109         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1110                 md = p;
1111
1112                 if (md->num_pages == 0) /* should not happen */
1113                         continue;
1114
1115                 flags = IORESOURCE_MEM;
1116                 switch (md->type) {
1117
1118                         case EFI_MEMORY_MAPPED_IO:
1119                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1120                                 continue;
1121
1122                         case EFI_LOADER_CODE:
1123                         case EFI_LOADER_DATA:
1124                         case EFI_BOOT_SERVICES_DATA:
1125                         case EFI_BOOT_SERVICES_CODE:
1126                         case EFI_CONVENTIONAL_MEMORY:
1127                                 if (md->attribute & EFI_MEMORY_WP) {
1128                                         name = "System ROM";
1129                                         flags |= IORESOURCE_READONLY;
1130                                 } else {
1131                                         name = "System RAM";
1132                                 }
1133                                 break;
1134
1135                         case EFI_ACPI_MEMORY_NVS:
1136                                 name = "ACPI Non-volatile Storage";
1137                                 flags |= IORESOURCE_BUSY;
1138                                 break;
1139
1140                         case EFI_UNUSABLE_MEMORY:
1141                                 name = "reserved";
1142                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1143                                 break;
1144
1145                         case EFI_RESERVED_TYPE:
1146                         case EFI_RUNTIME_SERVICES_CODE:
1147                         case EFI_RUNTIME_SERVICES_DATA:
1148                         case EFI_ACPI_RECLAIM_MEMORY:
1149                         default:
1150                                 name = "reserved";
1151                                 flags |= IORESOURCE_BUSY;
1152                                 break;
1153                 }
1154
1155                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1156                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1157                         return;
1158                 }
1159
1160                 res->name = name;
1161                 res->start = md->phys_addr;
1162                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1163                 res->flags = flags;
1164
1165                 if (insert_resource(&iomem_resource, res) < 0)
1166                         kfree(res);
1167                 else {
1168                         /*
1169                          * We don't know which region contains
1170                          * kernel data so we try it repeatedly and
1171                          * let the resource manager test it.
1172                          */
1173                         insert_resource(res, code_resource);
1174                         insert_resource(res, data_resource);
1175                         insert_resource(res, bss_resource);
1176 #ifdef CONFIG_KEXEC
1177                         insert_resource(res, &efi_memmap_res);
1178                         insert_resource(res, &boot_param_res);
1179                         if (crashk_res.end > crashk_res.start)
1180                                 insert_resource(res, &crashk_res);
1181 #endif
1182                 }
1183         }
1184 }
1185
1186 #ifdef CONFIG_KEXEC
1187 /* find a block of memory aligned to 64M exclude reserved regions
1188    rsvd_regions are sorted
1189  */
1190 unsigned long __init
1191 kdump_find_rsvd_region (unsigned long size,
1192                 struct rsvd_region *r, int n)
1193 {
1194   int i;
1195   u64 start, end;
1196   u64 alignment = 1UL << _PAGE_SIZE_64M;
1197   void *efi_map_start, *efi_map_end, *p;
1198   efi_memory_desc_t *md;
1199   u64 efi_desc_size;
1200
1201   efi_map_start = __va(ia64_boot_param->efi_memmap);
1202   efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1203   efi_desc_size = ia64_boot_param->efi_memdesc_size;
1204
1205   for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1206           md = p;
1207           if (!efi_wb(md))
1208                   continue;
1209           start = ALIGN(md->phys_addr, alignment);
1210           end = efi_md_end(md);
1211           for (i = 0; i < n; i++) {
1212                 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1213                         if (__pa(r[i].start) > start + size)
1214                                 return start;
1215                         start = ALIGN(__pa(r[i].end), alignment);
1216                         if (i < n-1 && __pa(r[i+1].start) < start + size)
1217                                 continue;
1218                         else
1219                                 break;
1220                 }
1221           }
1222           if (end > start + size)
1223                 return start;
1224   }
1225
1226   printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
1227         size);
1228   return ~0UL;
1229 }
1230 #endif
1231
1232 #ifdef CONFIG_PROC_VMCORE
1233 /* locate the size find a the descriptor at a certain address */
1234 unsigned long
1235 vmcore_find_descriptor_size (unsigned long address)
1236 {
1237         void *efi_map_start, *efi_map_end, *p;
1238         efi_memory_desc_t *md;
1239         u64 efi_desc_size;
1240         unsigned long ret = 0;
1241
1242         efi_map_start = __va(ia64_boot_param->efi_memmap);
1243         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1244         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1245
1246         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1247                 md = p;
1248                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1249                     && md->phys_addr == address) {
1250                         ret = efi_md_size(md);
1251                         break;
1252                 }
1253         }
1254
1255         if (ret == 0)
1256                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1257
1258         return ret;
1259 }
1260 #endif