arch/ia64/kernel/efi.c

   1 /*
   2  * Extensible Firmware Interface
   3  *
   4  * Based on Extensible Firmware Interface Specification version 0.9
   5  * April 30, 1999
   6  *
   7  * Copyright (C) 1999 VA Linux Systems
   8  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   9  * Copyright (C) 1999-2003 Hewlett-Packard Co.
  10  *      David Mosberger-Tang <davidm@hpl.hp.com>
  11  *      Stephane Eranian <eranian@hpl.hp.com>
  12  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  13  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  14  *
  15  * All EFI Runtime Services are not implemented yet as EFI only
  16  * supports physical mode addressing on SoftSDV. This is to be fixed
  17  * in a future version.  --drummond 1999-07-20
  18  *
  19  * Implemented EFI runtime services and virtual mode calls.  --davidm
  20  *
  21  * Goutham Rao: <goutham.rao@intel.com>
  22  *      Skip non-WB memory and ignore empty memory ranges.
  23  */
  24 #include <linux/module.h>
  25 #include <linux/bootmem.h>
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <linux/time.h>
  30 #include <linux/efi.h>
  31 #include <linux/kexec.h>
  32 #include <linux/mm.h>
  33
  34 #include <asm/io.h>
  35 #include <asm/kregs.h>
  36 #include <asm/meminit.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/processor.h>
  39 #include <asm/mca.h>
  40
  41 #define EFI_DEBUG       0
  42
  43 extern efi_status_t efi_call_phys (void *, ...);
  44
  45 struct efi efi;
  46 EXPORT_SYMBOL(efi);
  47 static efi_runtime_services_t *runtime;
  48 static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  49
  50 #define efi_call_virt(f, args...)       (*(f))(args)
  51
  52 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  53 static efi_status_t                                                            \
  54 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  55 {                                                                              \
  56         struct ia64_fpreg fr[6];                                               \
  57         efi_time_cap_t *atc = NULL;                                            \
  58         efi_status_t ret;                                                      \
  59                                                                                \
  60         if (tc)                                                                \
  61                 atc = adjust_arg(tc);                                          \
  62         ia64_save_scratch_fpregs(fr);                                          \
  63         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  64                                 adjust_arg(tm), atc);                          \
  65         ia64_load_scratch_fpregs(fr);                                          \
  66         return ret;                                                            \
  67 }
  68
  69 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  70 static efi_status_t                                                            \
  71 prefix##_set_time (efi_time_t *tm)                                             \
  72 {                                                                              \
  73         struct ia64_fpreg fr[6];                                               \
  74         efi_status_t ret;                                                      \
  75                                                                                \
  76         ia64_save_scratch_fpregs(fr);                                          \
  77         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
  78                                 adjust_arg(tm));                               \
  79         ia64_load_scratch_fpregs(fr);                                          \
  80         return ret;                                                            \
  81 }
  82
  83 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
  84 static efi_status_t                                                            \
  85 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
  86                           efi_time_t *tm)                                      \
  87 {                                                                              \
  88         struct ia64_fpreg fr[6];                                               \
  89         efi_status_t ret;                                                      \
  90                                                                                \
  91         ia64_save_scratch_fpregs(fr);                                          \
  92         ret = efi_call_##prefix(                                               \
  93                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
  94                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
  95         ia64_load_scratch_fpregs(fr);                                          \
  96         return ret;                                                            \
  97 }
  98
  99 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 100 static efi_status_t                                                            \
 101 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 102 {                                                                              \
 103         struct ia64_fpreg fr[6];                                               \
 104         efi_time_t *atm = NULL;                                                \
 105         efi_status_t ret;                                                      \
 106                                                                                \
 107         if (tm)                                                                \
 108                 atm = adjust_arg(tm);                                          \
 109         ia64_save_scratch_fpregs(fr);                                          \
 110         ret = efi_call_##prefix(                                               \
 111                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 112                 enabled, atm);                                                 \
 113         ia64_load_scratch_fpregs(fr);                                          \
 114         return ret;                                                            \
 115 }
 116
 117 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 118 static efi_status_t                                                            \
 119 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 120                        unsigned long *data_size, void *data)                   \
 121 {                                                                              \
 122         struct ia64_fpreg fr[6];                                               \
 123         u32 *aattr = NULL;                                                     \
 124         efi_status_t ret;                                                      \
 125                                                                                \
 126         if (attr)                                                              \
 127                 aattr = adjust_arg(attr);                                      \
 128         ia64_save_scratch_fpregs(fr);                                          \
 129         ret = efi_call_##prefix(                                               \
 130                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 131                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 132                 adjust_arg(data_size), adjust_arg(data));                      \
 133         ia64_load_scratch_fpregs(fr);                                          \
 134         return ret;                                                            \
 135 }
 136
 137 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 138 static efi_status_t                                                            \
 139 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 140                             efi_guid_t *vendor)                                \
 141 {                                                                              \
 142         struct ia64_fpreg fr[6];                                               \
 143         efi_status_t ret;                                                      \
 144                                                                                \
 145         ia64_save_scratch_fpregs(fr);                                          \
 146         ret = efi_call_##prefix(                                               \
 147                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 148                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 149         ia64_load_scratch_fpregs(fr);                                          \
 150         return ret;                                                            \
 151 }
 152
 153 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 154 static efi_status_t                                                            \
 155 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 156                        unsigned long attr, unsigned long data_size,            \
 157                        void *data)                                             \
 158 {                                                                              \
 159         struct ia64_fpreg fr[6];                                               \
 160         efi_status_t ret;                                                      \
 161                                                                                \
 162         ia64_save_scratch_fpregs(fr);                                          \
 163         ret = efi_call_##prefix(                                               \
 164                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 165                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 166                 adjust_arg(data));                                             \
 167         ia64_load_scratch_fpregs(fr);                                          \
 168         return ret;                                                            \
 169 }
 170
 171 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 172 static efi_status_t                                                            \
 173 prefix##_get_next_high_mono_count (u32 *count)                                 \
 174 {                                                                              \
 175         struct ia64_fpreg fr[6];                                               \
 176         efi_status_t ret;                                                      \
 177                                                                                \
 178         ia64_save_scratch_fpregs(fr);                                          \
 179         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 180                                 __va(runtime->get_next_high_mono_count),       \
 181                                 adjust_arg(count));                            \
 182         ia64_load_scratch_fpregs(fr);                                          \
 183         return ret;                                                            \
 184 }
 185
 186 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 187 static void                                                                    \
 188 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 189                        unsigned long data_size, efi_char16_t *data)            \
 190 {                                                                              \
 191         struct ia64_fpreg fr[6];                                               \
 192         efi_char16_t *adata = NULL;                                            \
 193                                                                                \
 194         if (data)                                                              \
 195                 adata = adjust_arg(data);                                      \
 196                                                                                \
 197         ia64_save_scratch_fpregs(fr);                                          \
 198         efi_call_##prefix(                                                     \
 199                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 200                 reset_type, status, data_size, adata);                         \
 201         /* should not return, but just in case... */                           \
 202         ia64_load_scratch_fpregs(fr);                                          \
 203 }
 204
 205 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 206
 207 STUB_GET_TIME(phys, phys_ptr)
 208 STUB_SET_TIME(phys, phys_ptr)
 209 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 210 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 211 STUB_GET_VARIABLE(phys, phys_ptr)
 212 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 213 STUB_SET_VARIABLE(phys, phys_ptr)
 214 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 215 STUB_RESET_SYSTEM(phys, phys_ptr)
 216
 217 #define id(arg) arg
 218
 219 STUB_GET_TIME(virt, id)
 220 STUB_SET_TIME(virt, id)
 221 STUB_GET_WAKEUP_TIME(virt, id)
 222 STUB_SET_WAKEUP_TIME(virt, id)
 223 STUB_GET_VARIABLE(virt, id)
 224 STUB_GET_NEXT_VARIABLE(virt, id)
 225 STUB_SET_VARIABLE(virt, id)
 226 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 227 STUB_RESET_SYSTEM(virt, id)
 228
 229 void
 230 efi_gettimeofday (struct timespec *ts)
 231 {
 232         efi_time_t tm;
 233
 234         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 235                 memset(ts, 0, sizeof(*ts));
 236                 return;
 237         }
 238
 239         ts->tv_sec = mktime(tm.year, tm.month, tm.day,
 240                             tm.hour, tm.minute, tm.second);
 241         ts->tv_nsec = tm.nanosecond;
 242 }
 243
 244 static int
 245 is_memory_available (efi_memory_desc_t *md)
 246 {
 247         if (!(md->attribute & EFI_MEMORY_WB))
 248                 return 0;
 249
 250         switch (md->type) {
 251               case EFI_LOADER_CODE:
 252               case EFI_LOADER_DATA:
 253               case EFI_BOOT_SERVICES_CODE:
 254               case EFI_BOOT_SERVICES_DATA:
 255               case EFI_CONVENTIONAL_MEMORY:
 256                 return 1;
 257         }
 258         return 0;
 259 }
 260
 261 typedef struct kern_memdesc {
 262         u64 attribute;
 263         u64 start;
 264         u64 num_pages;
 265 } kern_memdesc_t;
 266
 267 static kern_memdesc_t *kern_memmap;
 268
 269 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 270
 271 static inline u64
 272 kmd_end(kern_memdesc_t *kmd)
 273 {
 274         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 275 }
 276
 277 static inline u64
 278 efi_md_end(efi_memory_desc_t *md)
 279 {
 280         return (md->phys_addr + efi_md_size(md));
 281 }
 282
 283 static inline int
 284 efi_wb(efi_memory_desc_t *md)
 285 {
 286         return (md->attribute & EFI_MEMORY_WB);
 287 }
 288
 289 static inline int
 290 efi_uc(efi_memory_desc_t *md)
 291 {
 292         return (md->attribute & EFI_MEMORY_UC);
 293 }
 294
 295 static void
 296 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 297 {
 298         kern_memdesc_t *k;
 299         u64 start, end, voff;
 300
 301         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 302         for (k = kern_memmap; k->start != ~0UL; k++) {
 303                 if (k->attribute != attr)
 304                         continue;
 305                 start = PAGE_ALIGN(k->start);
 306                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 307                 if (start < end)
 308                         if ((*callback)(start + voff, end + voff, arg) < 0)
 309                                 return;
 310         }
 311 }
 312
 313 /*
 314  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 315  * descriptor that has memory that is available for OS use.
 316  */
 317 void
 318 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 319 {
 320         walk(callback, arg, EFI_MEMORY_WB);
 321 }
 322
 323 /*
 324  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 325  * descriptor that has memory that is available for uncached allocator.
 326  */
 327 void
 328 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 329 {
 330         walk(callback, arg, EFI_MEMORY_UC);
 331 }
 332
 333 /*
 334  * Look for the PAL_CODE region reported by EFI and map it using an
 335  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 336  * Abstraction Layer chapter 11 in ADAG
 337  */
 338 void *
 339 efi_get_pal_addr (void)
 340 {
 341         void *efi_map_start, *efi_map_end, *p;
 342         efi_memory_desc_t *md;
 343         u64 efi_desc_size;
 344         int pal_code_count = 0;
 345         u64 vaddr, mask;
 346
 347         efi_map_start = __va(ia64_boot_param->efi_memmap);
 348         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 349         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 350
 351         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 352                 md = p;
 353                 if (md->type != EFI_PAL_CODE)
 354                         continue;
 355
 356                 if (++pal_code_count > 1) {
 357                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 358                                "dropped @ %lx\n", md->phys_addr);
 359                         continue;
 360                 }
 361                 /*
 362                  * The only ITLB entry in region 7 that is used is the one
 363                  * installed by __start().  That entry covers a 64MB range.
 364                  */
 365                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 366                 vaddr = PAGE_OFFSET + md->phys_addr;
 367
 368                 /*
 369                  * We must check that the PAL mapping won't overlap with the
 370                  * kernel mapping.
 371                  *
 372                  * PAL code is guaranteed to be aligned on a power of 2 between
 373                  * 4k and 256KB and that only one ITR is needed to map it. This
 374                  * implies that the PAL code is always aligned on its size,
 375                  * i.e., the closest matching page size supported by the TLB.
 376                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 377                  * it is bigger than 64MB (very unlikely!).  So for now the
 378                  * following test is enough to determine whether or not we need
 379                  * a dedicated ITR for the PAL code.
 380                  */
 381                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 382                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 383                                __func__);
 384                         continue;
 385                 }
 386
 387                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 388                         panic("Whoa!  PAL code size bigger than a granule!");
 389
 390 #if EFI_DEBUG
 391                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 392
 393                 printk(KERN_INFO "CPU %d: mapping PAL code "
 394                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 395                        smp_processor_id(), md->phys_addr,
 396                        md->phys_addr + efi_md_size(md),
 397                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 398 #endif
 399                 return __va(md->phys_addr);
 400         }
 401         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 402                __func__);
 403         return NULL;
 404 }
 405
 406 void
 407 efi_map_pal_code (void)
 408 {
 409         void *pal_vaddr = efi_get_pal_addr ();
 410         u64 psr;
 411
 412         if (!pal_vaddr)
 413                 return;
 414
 415         /*
 416          * Cannot write to CRx with PSR.ic=1
 417          */
 418         psr = ia64_clear_ic();
 419         ia64_itr(0x1, IA64_TR_PALCODE,
 420                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 421                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 422                  IA64_GRANULE_SHIFT);
 423         ia64_set_psr(psr);              /* restore psr */
 424 }
 425
 426 void __init
 427 efi_init (void)
 428 {
 429         void *efi_map_start, *efi_map_end;
 430         efi_config_table_t *config_tables;
 431         efi_char16_t *c16;
 432         u64 efi_desc_size;
 433         char *cp, vendor[100] = "unknown";
 434         int i;
 435
 436         /*
 437          * It's too early to be able to use the standard kernel command line
 438          * support...
 439          */
 440         for (cp = boot_command_line; *cp; ) {
 441                 if (memcmp(cp, "mem=", 4) == 0) {
 442                         mem_limit = memparse(cp + 4, &cp);
 443                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 444                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 445                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 446                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 447                 } else {
 448                         while (*cp != ' ' && *cp)
 449                                 ++cp;
 450                         while (*cp == ' ')
 451                                 ++cp;
 452                 }
 453         }
 454         if (min_addr != 0UL)
 455                 printk(KERN_INFO "Ignoring memory below %luMB\n",
 456                        min_addr >> 20);
 457         if (max_addr != ~0UL)
 458                 printk(KERN_INFO "Ignoring memory above %luMB\n",
 459                        max_addr >> 20);
 460
 461         efi.systab = __va(ia64_boot_param->efi_systab);
 462
 463         /*
 464          * Verify the EFI Table
 465          */
 466         if (efi.systab == NULL)
 467                 panic("Whoa! Can't find EFI system table.\n");
 468         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 469                 panic("Whoa! EFI system table signature incorrect\n");
 470         if ((efi.systab->hdr.revision >> 16) == 0)
 471                 printk(KERN_WARNING "Warning: EFI system table version "
 472                        "%d.%02d, expected 1.00 or greater\n",
 473                        efi.systab->hdr.revision >> 16,
 474                        efi.systab->hdr.revision & 0xffff);
 475
 476         config_tables = __va(efi.systab->tables);
 477
 478         /* Show what we know for posterity */
 479         c16 = __va(efi.systab->fw_vendor);
 480         if (c16) {
 481                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 482                         vendor[i] = *c16++;
 483                 vendor[i] = '\0';
 484         }
 485
 486         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 487                efi.systab->hdr.revision >> 16,
 488                efi.systab->hdr.revision & 0xffff, vendor);
 489
 490         efi.mps        = EFI_INVALID_TABLE_ADDR;
 491         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 492         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 493         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 494         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 495         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 496         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 497         efi.uga        = EFI_INVALID_TABLE_ADDR;
 498
 499         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 500                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 501                         efi.mps = config_tables[i].table;
 502                         printk(" MPS=0x%lx", config_tables[i].table);
 503                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 504                         efi.acpi20 = config_tables[i].table;
 505                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 506                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 507                         efi.acpi = config_tables[i].table;
 508                         printk(" ACPI=0x%lx", config_tables[i].table);
 509                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 510                         efi.smbios = config_tables[i].table;
 511                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 512                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 513                         efi.sal_systab = config_tables[i].table;
 514                         printk(" SALsystab=0x%lx", config_tables[i].table);
 515                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 516                         efi.hcdp = config_tables[i].table;
 517                         printk(" HCDP=0x%lx", config_tables[i].table);
 518                 }
 519         }
 520         printk("\n");
 521
 522         runtime = __va(efi.systab->runtime);
 523         efi.get_time = phys_get_time;
 524         efi.set_time = phys_set_time;
 525         efi.get_wakeup_time = phys_get_wakeup_time;
 526         efi.set_wakeup_time = phys_set_wakeup_time;
 527         efi.get_variable = phys_get_variable;
 528         efi.get_next_variable = phys_get_next_variable;
 529         efi.set_variable = phys_set_variable;
 530         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 531         efi.reset_system = phys_reset_system;
 532
 533         efi_map_start = __va(ia64_boot_param->efi_memmap);
 534         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 535         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 536
 537 #if EFI_DEBUG
 538         /* print EFI memory map: */
 539         {
 540                 efi_memory_desc_t *md;
 541                 void *p;
 542
 543                 for (i = 0, p = efi_map_start; p < efi_map_end;
 544                      ++i, p += efi_desc_size)
 545                 {
 546                         const char *unit;
 547                         unsigned long size;
 548
 549                         md = p;
 550                         size = md->num_pages << EFI_PAGE_SHIFT;
 551
 552                         if ((size >> 40) > 0) {
 553                                 size >>= 40;
 554                                 unit = "TB";
 555                         } else if ((size >> 30) > 0) {
 556                                 size >>= 30;
 557                                 unit = "GB";
 558                         } else if ((size >> 20) > 0) {
 559                                 size >>= 20;
 560                                 unit = "MB";
 561                         } else {
 562                                 size >>= 10;
 563                                 unit = "KB";
 564                         }
 565
 566                         printk("mem%02d: type=%2u, attr=0x%016lx, "
 567                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 568                                i, md->type, md->attribute, md->phys_addr,
 569                                md->phys_addr + efi_md_size(md), size, unit);
 570                 }
 571         }
 572 #endif
 573
 574         efi_map_pal_code();
 575         efi_enter_virtual_mode();
 576 }
 577
 578 void
 579 efi_enter_virtual_mode (void)
 580 {
 581         void *efi_map_start, *efi_map_end, *p;
 582         efi_memory_desc_t *md;
 583         efi_status_t status;
 584         u64 efi_desc_size;
 585
 586         efi_map_start = __va(ia64_boot_param->efi_memmap);
 587         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 588         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 589
 590         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 591                 md = p;
 592                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 593                         /*
 594                          * Some descriptors have multiple bits set, so the
 595                          * order of the tests is relevant.
 596                          */
 597                         if (md->attribute & EFI_MEMORY_WB) {
 598                                 md->virt_addr = (u64) __va(md->phys_addr);
 599                         } else if (md->attribute & EFI_MEMORY_UC) {
 600                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 601                         } else if (md->attribute & EFI_MEMORY_WC) {
 602 #if 0
 603                                 md->virt_addr = ia64_remap(md->phys_addr,
 604                                                            (_PAGE_A |
 605                                                             _PAGE_P |
 606                                                             _PAGE_D |
 607                                                             _PAGE_MA_WC |
 608                                                             _PAGE_PL_0 |
 609                                                             _PAGE_AR_RW));
 610 #else
 611                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 612                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 613 #endif
 614                         } else if (md->attribute & EFI_MEMORY_WT) {
 615 #if 0
 616                                 md->virt_addr = ia64_remap(md->phys_addr,
 617                                                            (_PAGE_A |
 618                                                             _PAGE_P |
 619                                                             _PAGE_D |
 620                                                             _PAGE_MA_WT |
 621                                                             _PAGE_PL_0 |
 622                                                             _PAGE_AR_RW));
 623 #else
 624                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 625                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 626 #endif
 627                         }
 628                 }
 629         }
 630
 631         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 632                                ia64_boot_param->efi_memmap_size,
 633                                efi_desc_size,
 634                                ia64_boot_param->efi_memdesc_version,
 635                                ia64_boot_param->efi_memmap);
 636         if (status != EFI_SUCCESS) {
 637                 printk(KERN_WARNING "warning: unable to switch EFI into "
 638                        "virtual mode (status=%lu)\n", status);
 639                 return;
 640         }
 641
 642         /*
 643          * Now that EFI is in virtual mode, we call the EFI functions more
 644          * efficiently:
 645          */
 646         efi.get_time = virt_get_time;
 647         efi.set_time = virt_set_time;
 648         efi.get_wakeup_time = virt_get_wakeup_time;
 649         efi.set_wakeup_time = virt_set_wakeup_time;
 650         efi.get_variable = virt_get_variable;
 651         efi.get_next_variable = virt_get_next_variable;
 652         efi.set_variable = virt_set_variable;
 653         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 654         efi.reset_system = virt_reset_system;
 655 }
 656
 657 /*
 658  * Walk the EFI memory map looking for the I/O port range.  There can only be
 659  * one entry of this type, other I/O port ranges should be described via ACPI.
 660  */
 661 u64
 662 efi_get_iobase (void)
 663 {
 664         void *efi_map_start, *efi_map_end, *p;
 665         efi_memory_desc_t *md;
 666         u64 efi_desc_size;
 667
 668         efi_map_start = __va(ia64_boot_param->efi_memmap);
 669         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 670         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 671
 672         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 673                 md = p;
 674                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 675                         if (md->attribute & EFI_MEMORY_UC)
 676                                 return md->phys_addr;
 677                 }
 678         }
 679         return 0;
 680 }
 681
 682 static struct kern_memdesc *
 683 kern_memory_descriptor (unsigned long phys_addr)
 684 {
 685         struct kern_memdesc *md;
 686
 687         for (md = kern_memmap; md->start != ~0UL; md++) {
 688                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 689                          return md;
 690         }
 691         return NULL;
 692 }
 693
 694 static efi_memory_desc_t *
 695 efi_memory_descriptor (unsigned long phys_addr)
 696 {
 697         void *efi_map_start, *efi_map_end, *p;
 698         efi_memory_desc_t *md;
 699         u64 efi_desc_size;
 700
 701         efi_map_start = __va(ia64_boot_param->efi_memmap);
 702         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 703         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 704
 705         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 706                 md = p;
 707
 708                 if (phys_addr - md->phys_addr < efi_md_size(md))
 709                          return md;
 710         }
 711         return NULL;
 712 }
 713
 714 static int
 715 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 716 {
 717         void *efi_map_start, *efi_map_end, *p;
 718         efi_memory_desc_t *md;
 719         u64 efi_desc_size;
 720         unsigned long end;
 721
 722         efi_map_start = __va(ia64_boot_param->efi_memmap);
 723         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 724         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 725
 726         end = phys_addr + size;
 727
 728         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 729                 md = p;
 730                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 731                         return 1;
 732         }
 733         return 0;
 734 }
 735
 736 u32
 737 efi_mem_type (unsigned long phys_addr)
 738 {
 739         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 740
 741         if (md)
 742                 return md->type;
 743         return 0;
 744 }
 745
 746 u64
 747 efi_mem_attributes (unsigned long phys_addr)
 748 {
 749         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 750
 751         if (md)
 752                 return md->attribute;
 753         return 0;
 754 }
 755 EXPORT_SYMBOL(efi_mem_attributes);
 756
 757 u64
 758 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 759 {
 760         unsigned long end = phys_addr + size;
 761         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 762         u64 attr;
 763
 764         if (!md)
 765                 return 0;
 766
 767         /*
 768          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 769          * the kernel that firmware needs this region mapped.
 770          */
 771         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 772         do {
 773                 unsigned long md_end = efi_md_end(md);
 774
 775                 if (end <= md_end)
 776                         return attr;
 777
 778                 md = efi_memory_descriptor(md_end);
 779                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 780                         return 0;
 781         } while (md);
 782         return 0;       /* never reached */
 783 }
 784
 785 u64
 786 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 787 {
 788         unsigned long end = phys_addr + size;
 789         struct kern_memdesc *md;
 790         u64 attr;
 791
 792         /*
 793          * This is a hack for ioremap calls before we set up kern_memmap.
 794          * Maybe we should do efi_memmap_init() earlier instead.
 795          */
 796         if (!kern_memmap) {
 797                 attr = efi_mem_attribute(phys_addr, size);
 798                 if (attr & EFI_MEMORY_WB)
 799                         return EFI_MEMORY_WB;
 800                 return 0;
 801         }
 802
 803         md = kern_memory_descriptor(phys_addr);
 804         if (!md)
 805                 return 0;
 806
 807         attr = md->attribute;
 808         do {
 809                 unsigned long md_end = kmd_end(md);
 810
 811                 if (end <= md_end)
 812                         return attr;
 813
 814                 md = kern_memory_descriptor(md_end);
 815                 if (!md || md->attribute != attr)
 816                         return 0;
 817         } while (md);
 818         return 0;       /* never reached */
 819 }
 820 EXPORT_SYMBOL(kern_mem_attribute);
 821
 822 int
 823 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 824 {
 825         u64 attr;
 826
 827         /*
 828          * /dev/mem reads and writes use copy_to_user(), which implicitly
 829          * uses a granule-sized kernel identity mapping.  It's really
 830          * only safe to do this for regions in kern_memmap.  For more
 831          * details, see Documentation/ia64/aliasing.txt.
 832          */
 833         attr = kern_mem_attribute(phys_addr, size);
 834         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 835                 return 1;
 836         return 0;
 837 }
 838
 839 int
 840 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 841 {
 842         unsigned long phys_addr = pfn << PAGE_SHIFT;
 843         u64 attr;
 844
 845         attr = efi_mem_attribute(phys_addr, size);
 846
 847         /*
 848          * /dev/mem mmap uses normal user pages, so we don't need the entire
 849          * granule, but the entire region we're mapping must support the same
 850          * attribute.
 851          */
 852         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 853                 return 1;
 854
 855         /*
 856          * Intel firmware doesn't tell us about all the MMIO regions, so
 857          * in general we have to allow mmap requests.  But if EFI *does*
 858          * tell us about anything inside this region, we should deny it.
 859          * The user can always map a smaller region to avoid the overlap.
 860          */
 861         if (efi_memmap_intersects(phys_addr, size))
 862                 return 0;
 863
 864         return 1;
 865 }
 866
 867 pgprot_t
 868 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 869                      pgprot_t vma_prot)
 870 {
 871         unsigned long phys_addr = pfn << PAGE_SHIFT;
 872         u64 attr;
 873
 874         /*
 875          * For /dev/mem mmap, we use user mappings, but if the region is
 876          * in kern_memmap (and hence may be covered by a kernel mapping),
 877          * we must use the same attribute as the kernel mapping.
 878          */
 879         attr = kern_mem_attribute(phys_addr, size);
 880         if (attr & EFI_MEMORY_WB)
 881                 return pgprot_cacheable(vma_prot);
 882         else if (attr & EFI_MEMORY_UC)
 883                 return pgprot_noncached(vma_prot);
 884
 885         /*
 886          * Some chipsets don't support UC access to memory.  If
 887          * WB is supported, we prefer that.
 888          */
 889         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 890                 return pgprot_cacheable(vma_prot);
 891
 892         return pgprot_noncached(vma_prot);
 893 }
 894
 895 int __init
 896 efi_uart_console_only(void)
 897 {
 898         efi_status_t status;
 899         char *s, name[] = "ConOut";
 900         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 901         efi_char16_t *utf16, name_utf16[32];
 902         unsigned char data[1024];
 903         unsigned long size = sizeof(data);
 904         struct efi_generic_dev_path *hdr, *end_addr;
 905         int uart = 0;
 906
 907         /* Convert to UTF-16 */
 908         utf16 = name_utf16;
 909         s = name;
 910         while (*s)
 911                 *utf16++ = *s++ & 0x7f;
 912         *utf16 = 0;
 913
 914         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 915         if (status != EFI_SUCCESS) {
 916                 printk(KERN_ERR "No EFI %s variable?\n", name);
 917                 return 0;
 918         }
 919
 920         hdr = (struct efi_generic_dev_path *) data;
 921         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 922         while (hdr < end_addr) {
 923                 if (hdr->type == EFI_DEV_MSG &&
 924                     hdr->sub_type == EFI_DEV_MSG_UART)
 925                         uart = 1;
 926                 else if (hdr->type == EFI_DEV_END_PATH ||
 927                           hdr->type == EFI_DEV_END_PATH2) {
 928                         if (!uart)
 929                                 return 0;
 930                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 931                                 return 1;
 932                         uart = 0;
 933                 }
 934                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 935         }
 936         printk(KERN_ERR "Malformed %s value\n", name);
 937         return 0;
 938 }
 939
 940 /*
 941  * Look for the first granule aligned memory descriptor memory
 942  * that is big enough to hold EFI memory map. Make sure this
 943  * descriptor is atleast granule sized so it does not get trimmed
 944  */
 945 struct kern_memdesc *
 946 find_memmap_space (void)
 947 {
 948         u64     contig_low=0, contig_high=0;
 949         u64     as = 0, ae;
 950         void *efi_map_start, *efi_map_end, *p, *q;
 951         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 952         u64     space_needed, efi_desc_size;
 953         unsigned long total_mem = 0;
 954
 955         efi_map_start = __va(ia64_boot_param->efi_memmap);
 956         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 957         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 958
 959         /*
 960          * Worst case: we need 3 kernel descriptors for each efi descriptor
 961          * (if every entry has a WB part in the middle, and UC head and tail),
 962          * plus one for the end marker.
 963          */
 964         space_needed = sizeof(kern_memdesc_t) *
 965                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 966
 967         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 968                 md = p;
 969                 if (!efi_wb(md)) {
 970                         continue;
 971                 }
 972                 if (pmd == NULL || !efi_wb(pmd) ||
 973                     efi_md_end(pmd) != md->phys_addr) {
 974                         contig_low = GRANULEROUNDUP(md->phys_addr);
 975                         contig_high = efi_md_end(md);
 976                         for (q = p + efi_desc_size; q < efi_map_end;
 977                              q += efi_desc_size) {
 978                                 check_md = q;
 979                                 if (!efi_wb(check_md))
 980                                         break;
 981                                 if (contig_high != check_md->phys_addr)
 982                                         break;
 983                                 contig_high = efi_md_end(check_md);
 984                         }
 985                         contig_high = GRANULEROUNDDOWN(contig_high);
 986                 }
 987                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
 988                         continue;
 989
 990                 /* Round ends inward to granule boundaries */
 991                 as = max(contig_low, md->phys_addr);
 992                 ae = min(contig_high, efi_md_end(md));
 993
 994                 /* keep within max_addr= and min_addr= command line arg */
 995                 as = max(as, min_addr);
 996                 ae = min(ae, max_addr);
 997                 if (ae <= as)
 998                         continue;
 999
1000                 /* avoid going over mem= command line arg */
1001                 if (total_mem + (ae - as) > mem_limit)
1002                         ae -= total_mem + (ae - as) - mem_limit;
1003
1004                 if (ae <= as)
1005                         continue;
1006
1007                 if (ae - as > space_needed)
1008                         break;
1009         }
1010         if (p >= efi_map_end)
1011                 panic("Can't allocate space for kernel memory descriptors");
1012
1013         return __va(as);
1014 }
1015
1016 /*
1017  * Walk the EFI memory map and gather all memory available for kernel
1018  * to use.  We can allocate partial granules only if the unavailable
1019  * parts exist, and are WB.
1020  */
1021 unsigned long
1022 efi_memmap_init(unsigned long *s, unsigned long *e)
1023 {
1024         struct kern_memdesc *k, *prev = NULL;
1025         u64     contig_low=0, contig_high=0;
1026         u64     as, ae, lim;
1027         void *efi_map_start, *efi_map_end, *p, *q;
1028         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1029         u64     efi_desc_size;
1030         unsigned long total_mem = 0;
1031
1032         k = kern_memmap = find_memmap_space();
1033
1034         efi_map_start = __va(ia64_boot_param->efi_memmap);
1035         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1036         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1037
1038         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1039                 md = p;
1040                 if (!efi_wb(md)) {
1041                         if (efi_uc(md) &&
1042                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1043                              md->type == EFI_BOOT_SERVICES_DATA)) {
1044                                 k->attribute = EFI_MEMORY_UC;
1045                                 k->start = md->phys_addr;
1046                                 k->num_pages = md->num_pages;
1047                                 k++;
1048                         }
1049                         continue;
1050                 }
1051                 if (pmd == NULL || !efi_wb(pmd) ||
1052                     efi_md_end(pmd) != md->phys_addr) {
1053                         contig_low = GRANULEROUNDUP(md->phys_addr);
1054                         contig_high = efi_md_end(md);
1055                         for (q = p + efi_desc_size; q < efi_map_end;
1056                              q += efi_desc_size) {
1057                                 check_md = q;
1058                                 if (!efi_wb(check_md))
1059                                         break;
1060                                 if (contig_high != check_md->phys_addr)
1061                                         break;
1062                                 contig_high = efi_md_end(check_md);
1063                         }
1064                         contig_high = GRANULEROUNDDOWN(contig_high);
1065                 }
1066                 if (!is_memory_available(md))
1067                         continue;
1068
1069 #ifdef CONFIG_CRASH_DUMP
1070                 /* saved_max_pfn should ignore max_addr= command line arg */
1071                 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1072                         saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1073 #endif
1074                 /*
1075                  * Round ends inward to granule boundaries
1076                  * Give trimmings to uncached allocator
1077                  */
1078                 if (md->phys_addr < contig_low) {
1079                         lim = min(efi_md_end(md), contig_low);
1080                         if (efi_uc(md)) {
1081                                 if (k > kern_memmap &&
1082                                     (k-1)->attribute == EFI_MEMORY_UC &&
1083                                     kmd_end(k-1) == md->phys_addr) {
1084                                         (k-1)->num_pages +=
1085                                                 (lim - md->phys_addr)
1086                                                 >> EFI_PAGE_SHIFT;
1087                                 } else {
1088                                         k->attribute = EFI_MEMORY_UC;
1089                                         k->start = md->phys_addr;
1090                                         k->num_pages = (lim - md->phys_addr)
1091                                                 >> EFI_PAGE_SHIFT;
1092                                         k++;
1093                                 }
1094                         }
1095                         as = contig_low;
1096                 } else
1097                         as = md->phys_addr;
1098
1099                 if (efi_md_end(md) > contig_high) {
1100                         lim = max(md->phys_addr, contig_high);
1101                         if (efi_uc(md)) {
1102                                 if (lim == md->phys_addr && k > kern_memmap &&
1103                                     (k-1)->attribute == EFI_MEMORY_UC &&
1104                                     kmd_end(k-1) == md->phys_addr) {
1105                                         (k-1)->num_pages += md->num_pages;
1106                                 } else {
1107                                         k->attribute = EFI_MEMORY_UC;
1108                                         k->start = lim;
1109                                         k->num_pages = (efi_md_end(md) - lim)
1110                                                 >> EFI_PAGE_SHIFT;
1111                                         k++;
1112                                 }
1113                         }
1114                         ae = contig_high;
1115                 } else
1116                         ae = efi_md_end(md);
1117
1118                 /* keep within max_addr= and min_addr= command line arg */
1119                 as = max(as, min_addr);
1120                 ae = min(ae, max_addr);
1121                 if (ae <= as)
1122                         continue;
1123
1124                 /* avoid going over mem= command line arg */
1125                 if (total_mem + (ae - as) > mem_limit)
1126                         ae -= total_mem + (ae - as) - mem_limit;
1127
1128                 if (ae <= as)
1129                         continue;
1130                 if (prev && kmd_end(prev) == md->phys_addr) {
1131                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1132                         total_mem += ae - as;
1133                         continue;
1134                 }
1135                 k->attribute = EFI_MEMORY_WB;
1136                 k->start = as;
1137                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1138                 total_mem += ae - as;
1139                 prev = k++;
1140         }
1141         k->start = ~0L; /* end-marker */
1142
1143         /* reserve the memory we are using for kern_memmap */
1144         *s = (u64)kern_memmap;
1145         *e = (u64)++k;
1146
1147         return total_mem;
1148 }
1149
1150 void
1151 efi_initialize_iomem_resources(struct resource *code_resource,
1152                                struct resource *data_resource,
1153                                struct resource *bss_resource)
1154 {
1155         struct resource *res;
1156         void *efi_map_start, *efi_map_end, *p;
1157         efi_memory_desc_t *md;
1158         u64 efi_desc_size;
1159         char *name;
1160         unsigned long flags;
1161
1162         efi_map_start = __va(ia64_boot_param->efi_memmap);
1163         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1164         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1165
1166         res = NULL;
1167
1168         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1169                 md = p;
1170
1171                 if (md->num_pages == 0) /* should not happen */
1172                         continue;
1173
1174                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1175                 switch (md->type) {
1176
1177                         case EFI_MEMORY_MAPPED_IO:
1178                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1179                                 continue;
1180
1181                         case EFI_LOADER_CODE:
1182                         case EFI_LOADER_DATA:
1183                         case EFI_BOOT_SERVICES_DATA:
1184                         case EFI_BOOT_SERVICES_CODE:
1185                         case EFI_CONVENTIONAL_MEMORY:
1186                                 if (md->attribute & EFI_MEMORY_WP) {
1187                                         name = "System ROM";
1188                                         flags |= IORESOURCE_READONLY;
1189                                 } else {
1190                                         name = "System RAM";
1191                                 }
1192                                 break;
1193
1194                         case EFI_ACPI_MEMORY_NVS:
1195                                 name = "ACPI Non-volatile Storage";
1196                                 break;
1197
1198                         case EFI_UNUSABLE_MEMORY:
1199                                 name = "reserved";
1200                                 flags |= IORESOURCE_DISABLED;
1201                                 break;
1202
1203                         case EFI_RESERVED_TYPE:
1204                         case EFI_RUNTIME_SERVICES_CODE:
1205                         case EFI_RUNTIME_SERVICES_DATA:
1206                         case EFI_ACPI_RECLAIM_MEMORY:
1207                         default:
1208                                 name = "reserved";
1209                                 break;
1210                 }
1211
1212                 if ((res = kzalloc(sizeof(struct resource),
1213                                    GFP_KERNEL)) == NULL) {
1214                         printk(KERN_ERR
1215                                "failed to allocate resource for iomem\n");
1216                         return;
1217                 }
1218
1219                 res->name = name;
1220                 res->start = md->phys_addr;
1221                 res->end = md->phys_addr + efi_md_size(md) - 1;
1222                 res->flags = flags;
1223
1224                 if (insert_resource(&iomem_resource, res) < 0)
1225                         kfree(res);
1226                 else {
1227                         /*
1228                          * We don't know which region contains
1229                          * kernel data so we try it repeatedly and
1230                          * let the resource manager test it.
1231                          */
1232                         insert_resource(res, code_resource);
1233                         insert_resource(res, data_resource);
1234                         insert_resource(res, bss_resource);
1235 #ifdef CONFIG_KEXEC
1236                         insert_resource(res, &efi_memmap_res);
1237                         insert_resource(res, &boot_param_res);
1238                         if (crashk_res.end > crashk_res.start)
1239                                 insert_resource(res, &crashk_res);
1240 #endif
1241                 }
1242         }
1243 }
1244
1245 #ifdef CONFIG_KEXEC
1246 /* find a block of memory aligned to 64M exclude reserved regions
1247    rsvd_regions are sorted
1248  */
1249 unsigned long __init
1250 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1251 {
1252         int i;
1253         u64 start, end;
1254         u64 alignment = 1UL << _PAGE_SIZE_64M;
1255         void *efi_map_start, *efi_map_end, *p;
1256         efi_memory_desc_t *md;
1257         u64 efi_desc_size;
1258
1259         efi_map_start = __va(ia64_boot_param->efi_memmap);
1260         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1261         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1262
1263         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1264                 md = p;
1265                 if (!efi_wb(md))
1266                         continue;
1267                 start = ALIGN(md->phys_addr, alignment);
1268                 end = efi_md_end(md);
1269                 for (i = 0; i < n; i++) {
1270                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1271                                 if (__pa(r[i].start) > start + size)
1272                                         return start;
1273                                 start = ALIGN(__pa(r[i].end), alignment);
1274                                 if (i < n-1 &&
1275                                     __pa(r[i+1].start) < start + size)
1276                                         continue;
1277                                 else
1278                                         break;
1279                         }
1280                 }
1281                 if (end > start + size)
1282                         return start;
1283         }
1284
1285         printk(KERN_WARNING
1286                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1287         return ~0UL;
1288 }
1289 #endif
1290
1291 #ifdef CONFIG_PROC_VMCORE
1292 /* locate the size find a the descriptor at a certain address */
1293 unsigned long __init
1294 vmcore_find_descriptor_size (unsigned long address)
1295 {
1296         void *efi_map_start, *efi_map_end, *p;
1297         efi_memory_desc_t *md;
1298         u64 efi_desc_size;
1299         unsigned long ret = 0;
1300
1301         efi_map_start = __va(ia64_boot_param->efi_memmap);
1302         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1303         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1304
1305         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1306                 md = p;
1307                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1308                     && md->phys_addr == address) {
1309                         ret = efi_md_size(md);
1310                         break;
1311                 }
1312         }
1313
1314         if (ret == 0)
1315                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1316
1317         return ret;
1318 }
1319 #endif