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 "
 383                                "PAL code\n", __FUNCTION__);
 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                __FUNCTION__);
 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                         md = p;
 547                         printk("mem%02u: type=%u, attr=0x%lx, "
 548                                "range=[0x%016lx-0x%016lx) (%luMB)\n",
 549                                i, md->type, md->attribute, md->phys_addr,
 550                                md->phys_addr + efi_md_size(md),
 551                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 552                 }
 553         }
 554 #endif
 555
 556         efi_map_pal_code();
 557         efi_enter_virtual_mode();
 558 }
 559
 560 void
 561 efi_enter_virtual_mode (void)
 562 {
 563         void *efi_map_start, *efi_map_end, *p;
 564         efi_memory_desc_t *md;
 565         efi_status_t status;
 566         u64 efi_desc_size;
 567
 568         efi_map_start = __va(ia64_boot_param->efi_memmap);
 569         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 570         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 571
 572         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 573                 md = p;
 574                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 575                         /*
 576                          * Some descriptors have multiple bits set, so the
 577                          * order of the tests is relevant.
 578                          */
 579                         if (md->attribute & EFI_MEMORY_WB) {
 580                                 md->virt_addr = (u64) __va(md->phys_addr);
 581                         } else if (md->attribute & EFI_MEMORY_UC) {
 582                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 583                         } else if (md->attribute & EFI_MEMORY_WC) {
 584 #if 0
 585                                 md->virt_addr = ia64_remap(md->phys_addr,
 586                                                            (_PAGE_A |
 587                                                             _PAGE_P |
 588                                                             _PAGE_D |
 589                                                             _PAGE_MA_WC |
 590                                                             _PAGE_PL_0 |
 591                                                             _PAGE_AR_RW));
 592 #else
 593                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 594                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 595 #endif
 596                         } else if (md->attribute & EFI_MEMORY_WT) {
 597 #if 0
 598                                 md->virt_addr = ia64_remap(md->phys_addr,
 599                                                            (_PAGE_A |
 600                                                             _PAGE_P |
 601                                                             _PAGE_D |
 602                                                             _PAGE_MA_WT |
 603                                                             _PAGE_PL_0 |
 604                                                             _PAGE_AR_RW));
 605 #else
 606                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 607                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 608 #endif
 609                         }
 610                 }
 611         }
 612
 613         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 614                                ia64_boot_param->efi_memmap_size,
 615                                efi_desc_size,
 616                                ia64_boot_param->efi_memdesc_version,
 617                                ia64_boot_param->efi_memmap);
 618         if (status != EFI_SUCCESS) {
 619                 printk(KERN_WARNING "warning: unable to switch EFI into "
 620                        "virtual mode (status=%lu)\n", status);
 621                 return;
 622         }
 623
 624         /*
 625          * Now that EFI is in virtual mode, we call the EFI functions more
 626          * efficiently:
 627          */
 628         efi.get_time = virt_get_time;
 629         efi.set_time = virt_set_time;
 630         efi.get_wakeup_time = virt_get_wakeup_time;
 631         efi.set_wakeup_time = virt_set_wakeup_time;
 632         efi.get_variable = virt_get_variable;
 633         efi.get_next_variable = virt_get_next_variable;
 634         efi.set_variable = virt_set_variable;
 635         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 636         efi.reset_system = virt_reset_system;
 637 }
 638
 639 /*
 640  * Walk the EFI memory map looking for the I/O port range.  There can only be
 641  * one entry of this type, other I/O port ranges should be described via ACPI.
 642  */
 643 u64
 644 efi_get_iobase (void)
 645 {
 646         void *efi_map_start, *efi_map_end, *p;
 647         efi_memory_desc_t *md;
 648         u64 efi_desc_size;
 649
 650         efi_map_start = __va(ia64_boot_param->efi_memmap);
 651         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 652         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 653
 654         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 655                 md = p;
 656                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 657                         if (md->attribute & EFI_MEMORY_UC)
 658                                 return md->phys_addr;
 659                 }
 660         }
 661         return 0;
 662 }
 663
 664 static struct kern_memdesc *
 665 kern_memory_descriptor (unsigned long phys_addr)
 666 {
 667         struct kern_memdesc *md;
 668
 669         for (md = kern_memmap; md->start != ~0UL; md++) {
 670                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 671                          return md;
 672         }
 673         return NULL;
 674 }
 675
 676 static efi_memory_desc_t *
 677 efi_memory_descriptor (unsigned long phys_addr)
 678 {
 679         void *efi_map_start, *efi_map_end, *p;
 680         efi_memory_desc_t *md;
 681         u64 efi_desc_size;
 682
 683         efi_map_start = __va(ia64_boot_param->efi_memmap);
 684         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 685         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 686
 687         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 688                 md = p;
 689
 690                 if (phys_addr - md->phys_addr < efi_md_size(md))
 691                          return md;
 692         }
 693         return NULL;
 694 }
 695
 696 static int
 697 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 698 {
 699         void *efi_map_start, *efi_map_end, *p;
 700         efi_memory_desc_t *md;
 701         u64 efi_desc_size;
 702         unsigned long end;
 703
 704         efi_map_start = __va(ia64_boot_param->efi_memmap);
 705         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 706         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 707
 708         end = phys_addr + size;
 709
 710         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 711                 md = p;
 712                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 713                         return 1;
 714         }
 715         return 0;
 716 }
 717
 718 u32
 719 efi_mem_type (unsigned long phys_addr)
 720 {
 721         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 722
 723         if (md)
 724                 return md->type;
 725         return 0;
 726 }
 727
 728 u64
 729 efi_mem_attributes (unsigned long phys_addr)
 730 {
 731         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 732
 733         if (md)
 734                 return md->attribute;
 735         return 0;
 736 }
 737 EXPORT_SYMBOL(efi_mem_attributes);
 738
 739 u64
 740 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 741 {
 742         unsigned long end = phys_addr + size;
 743         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 744         u64 attr;
 745
 746         if (!md)
 747                 return 0;
 748
 749         /*
 750          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 751          * the kernel that firmware needs this region mapped.
 752          */
 753         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 754         do {
 755                 unsigned long md_end = efi_md_end(md);
 756
 757                 if (end <= md_end)
 758                         return attr;
 759
 760                 md = efi_memory_descriptor(md_end);
 761                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 762                         return 0;
 763         } while (md);
 764         return 0;       /* never reached */
 765 }
 766
 767 u64
 768 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 769 {
 770         unsigned long end = phys_addr + size;
 771         struct kern_memdesc *md;
 772         u64 attr;
 773
 774         /*
 775          * This is a hack for ioremap calls before we set up kern_memmap.
 776          * Maybe we should do efi_memmap_init() earlier instead.
 777          */
 778         if (!kern_memmap) {
 779                 attr = efi_mem_attribute(phys_addr, size);
 780                 if (attr & EFI_MEMORY_WB)
 781                         return EFI_MEMORY_WB;
 782                 return 0;
 783         }
 784
 785         md = kern_memory_descriptor(phys_addr);
 786         if (!md)
 787                 return 0;
 788
 789         attr = md->attribute;
 790         do {
 791                 unsigned long md_end = kmd_end(md);
 792
 793                 if (end <= md_end)
 794                         return attr;
 795
 796                 md = kern_memory_descriptor(md_end);
 797                 if (!md || md->attribute != attr)
 798                         return 0;
 799         } while (md);
 800         return 0;       /* never reached */
 801 }
 802 EXPORT_SYMBOL(kern_mem_attribute);
 803
 804 int
 805 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 806 {
 807         u64 attr;
 808
 809         /*
 810          * /dev/mem reads and writes use copy_to_user(), which implicitly
 811          * uses a granule-sized kernel identity mapping.  It's really
 812          * only safe to do this for regions in kern_memmap.  For more
 813          * details, see Documentation/ia64/aliasing.txt.
 814          */
 815         attr = kern_mem_attribute(phys_addr, size);
 816         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 817                 return 1;
 818         return 0;
 819 }
 820
 821 int
 822 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 823 {
 824         unsigned long phys_addr = pfn << PAGE_SHIFT;
 825         u64 attr;
 826
 827         attr = efi_mem_attribute(phys_addr, size);
 828
 829         /*
 830          * /dev/mem mmap uses normal user pages, so we don't need the entire
 831          * granule, but the entire region we're mapping must support the same
 832          * attribute.
 833          */
 834         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 835                 return 1;
 836
 837         /*
 838          * Intel firmware doesn't tell us about all the MMIO regions, so
 839          * in general we have to allow mmap requests.  But if EFI *does*
 840          * tell us about anything inside this region, we should deny it.
 841          * The user can always map a smaller region to avoid the overlap.
 842          */
 843         if (efi_memmap_intersects(phys_addr, size))
 844                 return 0;
 845
 846         return 1;
 847 }
 848
 849 pgprot_t
 850 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 851                      pgprot_t vma_prot)
 852 {
 853         unsigned long phys_addr = pfn << PAGE_SHIFT;
 854         u64 attr;
 855
 856         /*
 857          * For /dev/mem mmap, we use user mappings, but if the region is
 858          * in kern_memmap (and hence may be covered by a kernel mapping),
 859          * we must use the same attribute as the kernel mapping.
 860          */
 861         attr = kern_mem_attribute(phys_addr, size);
 862         if (attr & EFI_MEMORY_WB)
 863                 return pgprot_cacheable(vma_prot);
 864         else if (attr & EFI_MEMORY_UC)
 865                 return pgprot_noncached(vma_prot);
 866
 867         /*
 868          * Some chipsets don't support UC access to memory.  If
 869          * WB is supported, we prefer that.
 870          */
 871         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 872                 return pgprot_cacheable(vma_prot);
 873
 874         return pgprot_noncached(vma_prot);
 875 }
 876
 877 int __init
 878 efi_uart_console_only(void)
 879 {
 880         efi_status_t status;
 881         char *s, name[] = "ConOut";
 882         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 883         efi_char16_t *utf16, name_utf16[32];
 884         unsigned char data[1024];
 885         unsigned long size = sizeof(data);
 886         struct efi_generic_dev_path *hdr, *end_addr;
 887         int uart = 0;
 888
 889         /* Convert to UTF-16 */
 890         utf16 = name_utf16;
 891         s = name;
 892         while (*s)
 893                 *utf16++ = *s++ & 0x7f;
 894         *utf16 = 0;
 895
 896         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 897         if (status != EFI_SUCCESS) {
 898                 printk(KERN_ERR "No EFI %s variable?\n", name);
 899                 return 0;
 900         }
 901
 902         hdr = (struct efi_generic_dev_path *) data;
 903         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 904         while (hdr < end_addr) {
 905                 if (hdr->type == EFI_DEV_MSG &&
 906                     hdr->sub_type == EFI_DEV_MSG_UART)
 907                         uart = 1;
 908                 else if (hdr->type == EFI_DEV_END_PATH ||
 909                           hdr->type == EFI_DEV_END_PATH2) {
 910                         if (!uart)
 911                                 return 0;
 912                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 913                                 return 1;
 914                         uart = 0;
 915                 }
 916                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 917         }
 918         printk(KERN_ERR "Malformed %s value\n", name);
 919         return 0;
 920 }
 921
 922 /*
 923  * Look for the first granule aligned memory descriptor memory
 924  * that is big enough to hold EFI memory map. Make sure this
 925  * descriptor is atleast granule sized so it does not get trimmed
 926  */
 927 struct kern_memdesc *
 928 find_memmap_space (void)
 929 {
 930         u64     contig_low=0, contig_high=0;
 931         u64     as = 0, ae;
 932         void *efi_map_start, *efi_map_end, *p, *q;
 933         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 934         u64     space_needed, efi_desc_size;
 935         unsigned long total_mem = 0;
 936
 937         efi_map_start = __va(ia64_boot_param->efi_memmap);
 938         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 939         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 940
 941         /*
 942          * Worst case: we need 3 kernel descriptors for each efi descriptor
 943          * (if every entry has a WB part in the middle, and UC head and tail),
 944          * plus one for the end marker.
 945          */
 946         space_needed = sizeof(kern_memdesc_t) *
 947                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 948
 949         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 950                 md = p;
 951                 if (!efi_wb(md)) {
 952                         continue;
 953                 }
 954                 if (pmd == NULL || !efi_wb(pmd) ||
 955                     efi_md_end(pmd) != md->phys_addr) {
 956                         contig_low = GRANULEROUNDUP(md->phys_addr);
 957                         contig_high = efi_md_end(md);
 958                         for (q = p + efi_desc_size; q < efi_map_end;
 959                              q += efi_desc_size) {
 960                                 check_md = q;
 961                                 if (!efi_wb(check_md))
 962                                         break;
 963                                 if (contig_high != check_md->phys_addr)
 964                                         break;
 965                                 contig_high = efi_md_end(check_md);
 966                         }
 967                         contig_high = GRANULEROUNDDOWN(contig_high);
 968                 }
 969                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
 970                         continue;
 971
 972                 /* Round ends inward to granule boundaries */
 973                 as = max(contig_low, md->phys_addr);
 974                 ae = min(contig_high, efi_md_end(md));
 975
 976                 /* keep within max_addr= and min_addr= command line arg */
 977                 as = max(as, min_addr);
 978                 ae = min(ae, max_addr);
 979                 if (ae <= as)
 980                         continue;
 981
 982                 /* avoid going over mem= command line arg */
 983                 if (total_mem + (ae - as) > mem_limit)
 984                         ae -= total_mem + (ae - as) - mem_limit;
 985
 986                 if (ae <= as)
 987                         continue;
 988
 989                 if (ae - as > space_needed)
 990                         break;
 991         }
 992         if (p >= efi_map_end)
 993                 panic("Can't allocate space for kernel memory descriptors");
 994
 995         return __va(as);
 996 }
 997
 998 /*
 999  * Walk the EFI memory map and gather all memory available for kernel
1000  * to use.  We can allocate partial granules only if the unavailable
1001  * parts exist, and are WB.
1002  */
1003 unsigned long
1004 efi_memmap_init(unsigned long *s, unsigned long *e)
1005 {
1006         struct kern_memdesc *k, *prev = NULL;
1007         u64     contig_low=0, contig_high=0;
1008         u64     as, ae, lim;
1009         void *efi_map_start, *efi_map_end, *p, *q;
1010         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1011         u64     efi_desc_size;
1012         unsigned long total_mem = 0;
1013
1014         k = kern_memmap = find_memmap_space();
1015
1016         efi_map_start = __va(ia64_boot_param->efi_memmap);
1017         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1018         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1019
1020         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1021                 md = p;
1022                 if (!efi_wb(md)) {
1023                         if (efi_uc(md) &&
1024                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1025                              md->type == EFI_BOOT_SERVICES_DATA)) {
1026                                 k->attribute = EFI_MEMORY_UC;
1027                                 k->start = md->phys_addr;
1028                                 k->num_pages = md->num_pages;
1029                                 k++;
1030                         }
1031                         continue;
1032                 }
1033                 if (pmd == NULL || !efi_wb(pmd) ||
1034                     efi_md_end(pmd) != md->phys_addr) {
1035                         contig_low = GRANULEROUNDUP(md->phys_addr);
1036                         contig_high = efi_md_end(md);
1037                         for (q = p + efi_desc_size; q < efi_map_end;
1038                              q += efi_desc_size) {
1039                                 check_md = q;
1040                                 if (!efi_wb(check_md))
1041                                         break;
1042                                 if (contig_high != check_md->phys_addr)
1043                                         break;
1044                                 contig_high = efi_md_end(check_md);
1045                         }
1046                         contig_high = GRANULEROUNDDOWN(contig_high);
1047                 }
1048                 if (!is_memory_available(md))
1049                         continue;
1050
1051 #ifdef CONFIG_CRASH_DUMP
1052                 /* saved_max_pfn should ignore max_addr= command line arg */
1053                 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1054                         saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1055 #endif
1056                 /*
1057                  * Round ends inward to granule boundaries
1058                  * Give trimmings to uncached allocator
1059                  */
1060                 if (md->phys_addr < contig_low) {
1061                         lim = min(efi_md_end(md), contig_low);
1062                         if (efi_uc(md)) {
1063                                 if (k > kern_memmap &&
1064                                     (k-1)->attribute == EFI_MEMORY_UC &&
1065                                     kmd_end(k-1) == md->phys_addr) {
1066                                         (k-1)->num_pages +=
1067                                                 (lim - md->phys_addr)
1068                                                 >> EFI_PAGE_SHIFT;
1069                                 } else {
1070                                         k->attribute = EFI_MEMORY_UC;
1071                                         k->start = md->phys_addr;
1072                                         k->num_pages = (lim - md->phys_addr)
1073                                                 >> EFI_PAGE_SHIFT;
1074                                         k++;
1075                                 }
1076                         }
1077                         as = contig_low;
1078                 } else
1079                         as = md->phys_addr;
1080
1081                 if (efi_md_end(md) > contig_high) {
1082                         lim = max(md->phys_addr, contig_high);
1083                         if (efi_uc(md)) {
1084                                 if (lim == md->phys_addr && k > kern_memmap &&
1085                                     (k-1)->attribute == EFI_MEMORY_UC &&
1086                                     kmd_end(k-1) == md->phys_addr) {
1087                                         (k-1)->num_pages += md->num_pages;
1088                                 } else {
1089                                         k->attribute = EFI_MEMORY_UC;
1090                                         k->start = lim;
1091                                         k->num_pages = (efi_md_end(md) - lim)
1092                                                 >> EFI_PAGE_SHIFT;
1093                                         k++;
1094                                 }
1095                         }
1096                         ae = contig_high;
1097                 } else
1098                         ae = efi_md_end(md);
1099
1100                 /* keep within max_addr= and min_addr= command line arg */
1101                 as = max(as, min_addr);
1102                 ae = min(ae, max_addr);
1103                 if (ae <= as)
1104                         continue;
1105
1106                 /* avoid going over mem= command line arg */
1107                 if (total_mem + (ae - as) > mem_limit)
1108                         ae -= total_mem + (ae - as) - mem_limit;
1109
1110                 if (ae <= as)
1111                         continue;
1112                 if (prev && kmd_end(prev) == md->phys_addr) {
1113                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1114                         total_mem += ae - as;
1115                         continue;
1116                 }
1117                 k->attribute = EFI_MEMORY_WB;
1118                 k->start = as;
1119                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1120                 total_mem += ae - as;
1121                 prev = k++;
1122         }
1123         k->start = ~0L; /* end-marker */
1124
1125         /* reserve the memory we are using for kern_memmap */
1126         *s = (u64)kern_memmap;
1127         *e = (u64)++k;
1128
1129         return total_mem;
1130 }
1131
1132 void
1133 efi_initialize_iomem_resources(struct resource *code_resource,
1134                                struct resource *data_resource,
1135                                struct resource *bss_resource)
1136 {
1137         struct resource *res;
1138         void *efi_map_start, *efi_map_end, *p;
1139         efi_memory_desc_t *md;
1140         u64 efi_desc_size;
1141         char *name;
1142         unsigned long flags;
1143
1144         efi_map_start = __va(ia64_boot_param->efi_memmap);
1145         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1146         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1147
1148         res = NULL;
1149
1150         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1151                 md = p;
1152
1153                 if (md->num_pages == 0) /* should not happen */
1154                         continue;
1155
1156                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1157                 switch (md->type) {
1158
1159                         case EFI_MEMORY_MAPPED_IO:
1160                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1161                                 continue;
1162
1163                         case EFI_LOADER_CODE:
1164                         case EFI_LOADER_DATA:
1165                         case EFI_BOOT_SERVICES_DATA:
1166                         case EFI_BOOT_SERVICES_CODE:
1167                         case EFI_CONVENTIONAL_MEMORY:
1168                                 if (md->attribute & EFI_MEMORY_WP) {
1169                                         name = "System ROM";
1170                                         flags |= IORESOURCE_READONLY;
1171                                 } else {
1172                                         name = "System RAM";
1173                                 }
1174                                 break;
1175
1176                         case EFI_ACPI_MEMORY_NVS:
1177                                 name = "ACPI Non-volatile Storage";
1178                                 break;
1179
1180                         case EFI_UNUSABLE_MEMORY:
1181                                 name = "reserved";
1182                                 flags |= IORESOURCE_DISABLED;
1183                                 break;
1184
1185                         case EFI_RESERVED_TYPE:
1186                         case EFI_RUNTIME_SERVICES_CODE:
1187                         case EFI_RUNTIME_SERVICES_DATA:
1188                         case EFI_ACPI_RECLAIM_MEMORY:
1189                         default:
1190                                 name = "reserved";
1191                                 break;
1192                 }
1193
1194                 if ((res = kzalloc(sizeof(struct resource),
1195                                    GFP_KERNEL)) == NULL) {
1196                         printk(KERN_ERR
1197                                "failed to allocate resource for iomem\n");
1198                         return;
1199                 }
1200
1201                 res->name = name;
1202                 res->start = md->phys_addr;
1203                 res->end = md->phys_addr + efi_md_size(md) - 1;
1204                 res->flags = flags;
1205
1206                 if (insert_resource(&iomem_resource, res) < 0)
1207                         kfree(res);
1208                 else {
1209                         /*
1210                          * We don't know which region contains
1211                          * kernel data so we try it repeatedly and
1212                          * let the resource manager test it.
1213                          */
1214                         insert_resource(res, code_resource);
1215                         insert_resource(res, data_resource);
1216                         insert_resource(res, bss_resource);
1217 #ifdef CONFIG_KEXEC
1218                         insert_resource(res, &efi_memmap_res);
1219                         insert_resource(res, &boot_param_res);
1220                         if (crashk_res.end > crashk_res.start)
1221                                 insert_resource(res, &crashk_res);
1222 #endif
1223                 }
1224         }
1225 }
1226
1227 #ifdef CONFIG_KEXEC
1228 /* find a block of memory aligned to 64M exclude reserved regions
1229    rsvd_regions are sorted
1230  */
1231 unsigned long __init
1232 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1233 {
1234         int i;
1235         u64 start, end;
1236         u64 alignment = 1UL << _PAGE_SIZE_64M;
1237         void *efi_map_start, *efi_map_end, *p;
1238         efi_memory_desc_t *md;
1239         u64 efi_desc_size;
1240
1241         efi_map_start = __va(ia64_boot_param->efi_memmap);
1242         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1243         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1244
1245         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1246                 md = p;
1247                 if (!efi_wb(md))
1248                         continue;
1249                 start = ALIGN(md->phys_addr, alignment);
1250                 end = efi_md_end(md);
1251                 for (i = 0; i < n; i++) {
1252                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1253                                 if (__pa(r[i].start) > start + size)
1254                                         return start;
1255                                 start = ALIGN(__pa(r[i].end), alignment);
1256                                 if (i < n-1 &&
1257                                     __pa(r[i+1].start) < start + size)
1258                                         continue;
1259                                 else
1260                                         break;
1261                         }
1262                 }
1263                 if (end > start + size)
1264                         return start;
1265         }
1266
1267         printk(KERN_WARNING
1268                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1269         return ~0UL;
1270 }
1271 #endif
1272
1273 #ifdef CONFIG_PROC_VMCORE
1274 /* locate the size find a the descriptor at a certain address */
1275 unsigned long __init
1276 vmcore_find_descriptor_size (unsigned long address)
1277 {
1278         void *efi_map_start, *efi_map_end, *p;
1279         efi_memory_desc_t *md;
1280         u64 efi_desc_size;
1281         unsigned long ret = 0;
1282
1283         efi_map_start = __va(ia64_boot_param->efi_memmap);
1284         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1285         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1286
1287         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1288                 md = p;
1289                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1290                     && md->phys_addr == address) {
1291                         ret = efi_md_size(md);
1292                         break;
1293                 }
1294         }
1295
1296         if (ret == 0)
1297                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1298
1299         return ret;
1300 }
1301 #endif