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/crash_dump.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/slab.h>
  31 #include <linux/time.h>
  32 #include <linux/efi.h>
  33 #include <linux/kexec.h>
  34 #include <linux/mm.h>
  35
  36 #include <asm/io.h>
  37 #include <asm/kregs.h>
  38 #include <asm/meminit.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/processor.h>
  41 #include <asm/mca.h>
  42 #include <asm/setup.h>
  43 #include <asm/tlbflush.h>
  44
  45 #define EFI_DEBUG       0
  46
  47 extern efi_status_t efi_call_phys (void *, ...);
  48
  49 struct efi efi;
  50 EXPORT_SYMBOL(efi);
  51 static efi_runtime_services_t *runtime;
  52 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  53
  54 #define efi_call_virt(f, args...)       (*(f))(args)
  55
  56 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  57 static efi_status_t                                                            \
  58 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  59 {                                                                              \
  60         struct ia64_fpreg fr[6];                                               \
  61         efi_time_cap_t *atc = NULL;                                            \
  62         efi_status_t ret;                                                      \
  63                                                                                \
  64         if (tc)                                                                \
  65                 atc = adjust_arg(tc);                                          \
  66         ia64_save_scratch_fpregs(fr);                                          \
  67         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  68                                 adjust_arg(tm), atc);                          \
  69         ia64_load_scratch_fpregs(fr);                                          \
  70         return ret;                                                            \
  71 }
  72
  73 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  74 static efi_status_t                                                            \
  75 prefix##_set_time (efi_time_t *tm)                                             \
  76 {                                                                              \
  77         struct ia64_fpreg fr[6];                                               \
  78         efi_status_t ret;                                                      \
  79                                                                                \
  80         ia64_save_scratch_fpregs(fr);                                          \
  81         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
  82                                 adjust_arg(tm));                               \
  83         ia64_load_scratch_fpregs(fr);                                          \
  84         return ret;                                                            \
  85 }
  86
  87 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
  88 static efi_status_t                                                            \
  89 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
  90                           efi_time_t *tm)                                      \
  91 {                                                                              \
  92         struct ia64_fpreg fr[6];                                               \
  93         efi_status_t ret;                                                      \
  94                                                                                \
  95         ia64_save_scratch_fpregs(fr);                                          \
  96         ret = efi_call_##prefix(                                               \
  97                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
  98                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
  99         ia64_load_scratch_fpregs(fr);                                          \
 100         return ret;                                                            \
 101 }
 102
 103 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 104 static efi_status_t                                                            \
 105 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 106 {                                                                              \
 107         struct ia64_fpreg fr[6];                                               \
 108         efi_time_t *atm = NULL;                                                \
 109         efi_status_t ret;                                                      \
 110                                                                                \
 111         if (tm)                                                                \
 112                 atm = adjust_arg(tm);                                          \
 113         ia64_save_scratch_fpregs(fr);                                          \
 114         ret = efi_call_##prefix(                                               \
 115                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 116                 enabled, atm);                                                 \
 117         ia64_load_scratch_fpregs(fr);                                          \
 118         return ret;                                                            \
 119 }
 120
 121 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 122 static efi_status_t                                                            \
 123 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 124                        unsigned long *data_size, void *data)                   \
 125 {                                                                              \
 126         struct ia64_fpreg fr[6];                                               \
 127         u32 *aattr = NULL;                                                     \
 128         efi_status_t ret;                                                      \
 129                                                                                \
 130         if (attr)                                                              \
 131                 aattr = adjust_arg(attr);                                      \
 132         ia64_save_scratch_fpregs(fr);                                          \
 133         ret = efi_call_##prefix(                                               \
 134                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 135                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 136                 adjust_arg(data_size), adjust_arg(data));                      \
 137         ia64_load_scratch_fpregs(fr);                                          \
 138         return ret;                                                            \
 139 }
 140
 141 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 142 static efi_status_t                                                            \
 143 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 144                             efi_guid_t *vendor)                                \
 145 {                                                                              \
 146         struct ia64_fpreg fr[6];                                               \
 147         efi_status_t ret;                                                      \
 148                                                                                \
 149         ia64_save_scratch_fpregs(fr);                                          \
 150         ret = efi_call_##prefix(                                               \
 151                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 152                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 153         ia64_load_scratch_fpregs(fr);                                          \
 154         return ret;                                                            \
 155 }
 156
 157 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 158 static efi_status_t                                                            \
 159 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 160                        u32 attr, unsigned long data_size,                      \
 161                        void *data)                                             \
 162 {                                                                              \
 163         struct ia64_fpreg fr[6];                                               \
 164         efi_status_t ret;                                                      \
 165                                                                                \
 166         ia64_save_scratch_fpregs(fr);                                          \
 167         ret = efi_call_##prefix(                                               \
 168                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 169                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 170                 adjust_arg(data));                                             \
 171         ia64_load_scratch_fpregs(fr);                                          \
 172         return ret;                                                            \
 173 }
 174
 175 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 176 static efi_status_t                                                            \
 177 prefix##_get_next_high_mono_count (u32 *count)                                 \
 178 {                                                                              \
 179         struct ia64_fpreg fr[6];                                               \
 180         efi_status_t ret;                                                      \
 181                                                                                \
 182         ia64_save_scratch_fpregs(fr);                                          \
 183         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 184                                 __va(runtime->get_next_high_mono_count),       \
 185                                 adjust_arg(count));                            \
 186         ia64_load_scratch_fpregs(fr);                                          \
 187         return ret;                                                            \
 188 }
 189
 190 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 191 static void                                                                    \
 192 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 193                        unsigned long data_size, efi_char16_t *data)            \
 194 {                                                                              \
 195         struct ia64_fpreg fr[6];                                               \
 196         efi_char16_t *adata = NULL;                                            \
 197                                                                                \
 198         if (data)                                                              \
 199                 adata = adjust_arg(data);                                      \
 200                                                                                \
 201         ia64_save_scratch_fpregs(fr);                                          \
 202         efi_call_##prefix(                                                     \
 203                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 204                 reset_type, status, data_size, adata);                         \
 205         /* should not return, but just in case... */                           \
 206         ia64_load_scratch_fpregs(fr);                                          \
 207 }
 208
 209 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 210
 211 STUB_GET_TIME(phys, phys_ptr)
 212 STUB_SET_TIME(phys, phys_ptr)
 213 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 214 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 215 STUB_GET_VARIABLE(phys, phys_ptr)
 216 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 217 STUB_SET_VARIABLE(phys, phys_ptr)
 218 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 219 STUB_RESET_SYSTEM(phys, phys_ptr)
 220
 221 #define id(arg) arg
 222
 223 STUB_GET_TIME(virt, id)
 224 STUB_SET_TIME(virt, id)
 225 STUB_GET_WAKEUP_TIME(virt, id)
 226 STUB_SET_WAKEUP_TIME(virt, id)
 227 STUB_GET_VARIABLE(virt, id)
 228 STUB_GET_NEXT_VARIABLE(virt, id)
 229 STUB_SET_VARIABLE(virt, id)
 230 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 231 STUB_RESET_SYSTEM(virt, id)
 232
 233 void
 234 efi_gettimeofday (struct timespec *ts)
 235 {
 236         efi_time_t tm;
 237
 238         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 239                 memset(ts, 0, sizeof(*ts));
 240                 return;
 241         }
 242
 243         ts->tv_sec = mktime(tm.year, tm.month, tm.day,
 244                             tm.hour, tm.minute, tm.second);
 245         ts->tv_nsec = tm.nanosecond;
 246 }
 247
 248 static int
 249 is_memory_available (efi_memory_desc_t *md)
 250 {
 251         if (!(md->attribute & EFI_MEMORY_WB))
 252                 return 0;
 253
 254         switch (md->type) {
 255               case EFI_LOADER_CODE:
 256               case EFI_LOADER_DATA:
 257               case EFI_BOOT_SERVICES_CODE:
 258               case EFI_BOOT_SERVICES_DATA:
 259               case EFI_CONVENTIONAL_MEMORY:
 260                 return 1;
 261         }
 262         return 0;
 263 }
 264
 265 typedef struct kern_memdesc {
 266         u64 attribute;
 267         u64 start;
 268         u64 num_pages;
 269 } kern_memdesc_t;
 270
 271 static kern_memdesc_t *kern_memmap;
 272
 273 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 274
 275 static inline u64
 276 kmd_end(kern_memdesc_t *kmd)
 277 {
 278         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 279 }
 280
 281 static inline u64
 282 efi_md_end(efi_memory_desc_t *md)
 283 {
 284         return (md->phys_addr + efi_md_size(md));
 285 }
 286
 287 static inline int
 288 efi_wb(efi_memory_desc_t *md)
 289 {
 290         return (md->attribute & EFI_MEMORY_WB);
 291 }
 292
 293 static inline int
 294 efi_uc(efi_memory_desc_t *md)
 295 {
 296         return (md->attribute & EFI_MEMORY_UC);
 297 }
 298
 299 static void
 300 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 301 {
 302         kern_memdesc_t *k;
 303         u64 start, end, voff;
 304
 305         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 306         for (k = kern_memmap; k->start != ~0UL; k++) {
 307                 if (k->attribute != attr)
 308                         continue;
 309                 start = PAGE_ALIGN(k->start);
 310                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 311                 if (start < end)
 312                         if ((*callback)(start + voff, end + voff, arg) < 0)
 313                                 return;
 314         }
 315 }
 316
 317 /*
 318  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 319  * descriptor that has memory that is available for OS use.
 320  */
 321 void
 322 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 323 {
 324         walk(callback, arg, EFI_MEMORY_WB);
 325 }
 326
 327 /*
 328  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 329  * descriptor that has memory that is available for uncached allocator.
 330  */
 331 void
 332 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 333 {
 334         walk(callback, arg, EFI_MEMORY_UC);
 335 }
 336
 337 /*
 338  * Look for the PAL_CODE region reported by EFI and map it using an
 339  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 340  * Abstraction Layer chapter 11 in ADAG
 341  */
 342 void *
 343 efi_get_pal_addr (void)
 344 {
 345         void *efi_map_start, *efi_map_end, *p;
 346         efi_memory_desc_t *md;
 347         u64 efi_desc_size;
 348         int pal_code_count = 0;
 349         u64 vaddr, mask;
 350
 351         efi_map_start = __va(ia64_boot_param->efi_memmap);
 352         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 353         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 354
 355         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 356                 md = p;
 357                 if (md->type != EFI_PAL_CODE)
 358                         continue;
 359
 360                 if (++pal_code_count > 1) {
 361                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 362                                "dropped @ %llx\n", md->phys_addr);
 363                         continue;
 364                 }
 365                 /*
 366                  * The only ITLB entry in region 7 that is used is the one
 367                  * installed by __start().  That entry covers a 64MB range.
 368                  */
 369                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 370                 vaddr = PAGE_OFFSET + md->phys_addr;
 371
 372                 /*
 373                  * We must check that the PAL mapping won't overlap with the
 374                  * kernel mapping.
 375                  *
 376                  * PAL code is guaranteed to be aligned on a power of 2 between
 377                  * 4k and 256KB and that only one ITR is needed to map it. This
 378                  * implies that the PAL code is always aligned on its size,
 379                  * i.e., the closest matching page size supported by the TLB.
 380                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 381                  * it is bigger than 64MB (very unlikely!).  So for now the
 382                  * following test is enough to determine whether or not we need
 383                  * a dedicated ITR for the PAL code.
 384                  */
 385                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 386                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 387                                __func__);
 388                         continue;
 389                 }
 390
 391                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 392                         panic("Whoa!  PAL code size bigger than a granule!");
 393
 394 #if EFI_DEBUG
 395                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 396
 397                 printk(KERN_INFO "CPU %d: mapping PAL code "
 398                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 399                        smp_processor_id(), md->phys_addr,
 400                        md->phys_addr + efi_md_size(md),
 401                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 402 #endif
 403                 return __va(md->phys_addr);
 404         }
 405         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 406                __func__);
 407         return NULL;
 408 }
 409
 410
 411 static u8 __init palo_checksum(u8 *buffer, u32 length)
 412 {
 413         u8 sum = 0;
 414         u8 *end = buffer + length;
 415
 416         while (buffer < end)
 417                 sum = (u8) (sum + *(buffer++));
 418
 419         return sum;
 420 }
 421
 422 /*
 423  * Parse and handle PALO table which is published at:
 424  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 425  */
 426 static void __init handle_palo(unsigned long palo_phys)
 427 {
 428         struct palo_table *palo = __va(palo_phys);
 429         u8  checksum;
 430
 431         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 432                 printk(KERN_INFO "PALO signature incorrect.\n");
 433                 return;
 434         }
 435
 436         checksum = palo_checksum((u8 *)palo, palo->length);
 437         if (checksum) {
 438                 printk(KERN_INFO "PALO checksum incorrect.\n");
 439                 return;
 440         }
 441
 442         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 443 }
 444
 445 void
 446 efi_map_pal_code (void)
 447 {
 448         void *pal_vaddr = efi_get_pal_addr ();
 449         u64 psr;
 450
 451         if (!pal_vaddr)
 452                 return;
 453
 454         /*
 455          * Cannot write to CRx with PSR.ic=1
 456          */
 457         psr = ia64_clear_ic();
 458         ia64_itr(0x1, IA64_TR_PALCODE,
 459                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 460                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 461                  IA64_GRANULE_SHIFT);
 462         paravirt_dv_serialize_data();
 463         ia64_set_psr(psr);              /* restore psr */
 464 }
 465
 466 void __init
 467 efi_init (void)
 468 {
 469         void *efi_map_start, *efi_map_end;
 470         efi_config_table_t *config_tables;
 471         efi_char16_t *c16;
 472         u64 efi_desc_size;
 473         char *cp, vendor[100] = "unknown";
 474         int i;
 475         unsigned long palo_phys;
 476
 477         /*
 478          * It's too early to be able to use the standard kernel command line
 479          * support...
 480          */
 481         for (cp = boot_command_line; *cp; ) {
 482                 if (memcmp(cp, "mem=", 4) == 0) {
 483                         mem_limit = memparse(cp + 4, &cp);
 484                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 485                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 486                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 487                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 488                 } else {
 489                         while (*cp != ' ' && *cp)
 490                                 ++cp;
 491                         while (*cp == ' ')
 492                                 ++cp;
 493                 }
 494         }
 495         if (min_addr != 0UL)
 496                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 497                        min_addr >> 20);
 498         if (max_addr != ~0UL)
 499                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 500                        max_addr >> 20);
 501
 502         efi.systab = __va(ia64_boot_param->efi_systab);
 503
 504         /*
 505          * Verify the EFI Table
 506          */
 507         if (efi.systab == NULL)
 508                 panic("Whoa! Can't find EFI system table.\n");
 509         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 510                 panic("Whoa! EFI system table signature incorrect\n");
 511         if ((efi.systab->hdr.revision >> 16) == 0)
 512                 printk(KERN_WARNING "Warning: EFI system table version "
 513                        "%d.%02d, expected 1.00 or greater\n",
 514                        efi.systab->hdr.revision >> 16,
 515                        efi.systab->hdr.revision & 0xffff);
 516
 517         config_tables = __va(efi.systab->tables);
 518
 519         /* Show what we know for posterity */
 520         c16 = __va(efi.systab->fw_vendor);
 521         if (c16) {
 522                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 523                         vendor[i] = *c16++;
 524                 vendor[i] = '\0';
 525         }
 526
 527         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 528                efi.systab->hdr.revision >> 16,
 529                efi.systab->hdr.revision & 0xffff, vendor);
 530
 531         efi.mps        = EFI_INVALID_TABLE_ADDR;
 532         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 533         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 534         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 535         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 536         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 537         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 538         efi.uga        = EFI_INVALID_TABLE_ADDR;
 539
 540         palo_phys      = EFI_INVALID_TABLE_ADDR;
 541
 542         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 543                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 544                         efi.mps = config_tables[i].table;
 545                         printk(" MPS=0x%lx", config_tables[i].table);
 546                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 547                         efi.acpi20 = config_tables[i].table;
 548                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 549                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 550                         efi.acpi = config_tables[i].table;
 551                         printk(" ACPI=0x%lx", config_tables[i].table);
 552                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 553                         efi.smbios = config_tables[i].table;
 554                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 555                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 556                         efi.sal_systab = config_tables[i].table;
 557                         printk(" SALsystab=0x%lx", config_tables[i].table);
 558                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 559                         efi.hcdp = config_tables[i].table;
 560                         printk(" HCDP=0x%lx", config_tables[i].table);
 561                 } else if (efi_guidcmp(config_tables[i].guid,
 562                          PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID) == 0) {
 563                         palo_phys = config_tables[i].table;
 564                         printk(" PALO=0x%lx", config_tables[i].table);
 565                 }
 566         }
 567         printk("\n");
 568
 569         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 570                 handle_palo(palo_phys);
 571
 572         runtime = __va(efi.systab->runtime);
 573         efi.get_time = phys_get_time;
 574         efi.set_time = phys_set_time;
 575         efi.get_wakeup_time = phys_get_wakeup_time;
 576         efi.set_wakeup_time = phys_set_wakeup_time;
 577         efi.get_variable = phys_get_variable;
 578         efi.get_next_variable = phys_get_next_variable;
 579         efi.set_variable = phys_set_variable;
 580         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 581         efi.reset_system = phys_reset_system;
 582
 583         efi_map_start = __va(ia64_boot_param->efi_memmap);
 584         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 585         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 586
 587 #if EFI_DEBUG
 588         /* print EFI memory map: */
 589         {
 590                 efi_memory_desc_t *md;
 591                 void *p;
 592
 593                 for (i = 0, p = efi_map_start; p < efi_map_end;
 594                      ++i, p += efi_desc_size)
 595                 {
 596                         const char *unit;
 597                         unsigned long size;
 598
 599                         md = p;
 600                         size = md->num_pages << EFI_PAGE_SHIFT;
 601
 602                         if ((size >> 40) > 0) {
 603                                 size >>= 40;
 604                                 unit = "TB";
 605                         } else if ((size >> 30) > 0) {
 606                                 size >>= 30;
 607                                 unit = "GB";
 608                         } else if ((size >> 20) > 0) {
 609                                 size >>= 20;
 610                                 unit = "MB";
 611                         } else {
 612                                 size >>= 10;
 613                                 unit = "KB";
 614                         }
 615
 616                         printk("mem%02d: type=%2u, attr=0x%016lx, "
 617                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 618                                i, md->type, md->attribute, md->phys_addr,
 619                                md->phys_addr + efi_md_size(md), size, unit);
 620                 }
 621         }
 622 #endif
 623
 624         efi_map_pal_code();
 625         efi_enter_virtual_mode();
 626 }
 627
 628 void
 629 efi_enter_virtual_mode (void)
 630 {
 631         void *efi_map_start, *efi_map_end, *p;
 632         efi_memory_desc_t *md;
 633         efi_status_t status;
 634         u64 efi_desc_size;
 635
 636         efi_map_start = __va(ia64_boot_param->efi_memmap);
 637         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 638         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 639
 640         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 641                 md = p;
 642                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 643                         /*
 644                          * Some descriptors have multiple bits set, so the
 645                          * order of the tests is relevant.
 646                          */
 647                         if (md->attribute & EFI_MEMORY_WB) {
 648                                 md->virt_addr = (u64) __va(md->phys_addr);
 649                         } else if (md->attribute & EFI_MEMORY_UC) {
 650                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 651                         } else if (md->attribute & EFI_MEMORY_WC) {
 652 #if 0
 653                                 md->virt_addr = ia64_remap(md->phys_addr,
 654                                                            (_PAGE_A |
 655                                                             _PAGE_P |
 656                                                             _PAGE_D |
 657                                                             _PAGE_MA_WC |
 658                                                             _PAGE_PL_0 |
 659                                                             _PAGE_AR_RW));
 660 #else
 661                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 662                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 663 #endif
 664                         } else if (md->attribute & EFI_MEMORY_WT) {
 665 #if 0
 666                                 md->virt_addr = ia64_remap(md->phys_addr,
 667                                                            (_PAGE_A |
 668                                                             _PAGE_P |
 669                                                             _PAGE_D |
 670                                                             _PAGE_MA_WT |
 671                                                             _PAGE_PL_0 |
 672                                                             _PAGE_AR_RW));
 673 #else
 674                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 675                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 676 #endif
 677                         }
 678                 }
 679         }
 680
 681         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 682                                ia64_boot_param->efi_memmap_size,
 683                                efi_desc_size,
 684                                ia64_boot_param->efi_memdesc_version,
 685                                ia64_boot_param->efi_memmap);
 686         if (status != EFI_SUCCESS) {
 687                 printk(KERN_WARNING "warning: unable to switch EFI into "
 688                        "virtual mode (status=%lu)\n", status);
 689                 return;
 690         }
 691
 692         /*
 693          * Now that EFI is in virtual mode, we call the EFI functions more
 694          * efficiently:
 695          */
 696         efi.get_time = virt_get_time;
 697         efi.set_time = virt_set_time;
 698         efi.get_wakeup_time = virt_get_wakeup_time;
 699         efi.set_wakeup_time = virt_set_wakeup_time;
 700         efi.get_variable = virt_get_variable;
 701         efi.get_next_variable = virt_get_next_variable;
 702         efi.set_variable = virt_set_variable;
 703         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 704         efi.reset_system = virt_reset_system;
 705 }
 706
 707 /*
 708  * Walk the EFI memory map looking for the I/O port range.  There can only be
 709  * one entry of this type, other I/O port ranges should be described via ACPI.
 710  */
 711 u64
 712 efi_get_iobase (void)
 713 {
 714         void *efi_map_start, *efi_map_end, *p;
 715         efi_memory_desc_t *md;
 716         u64 efi_desc_size;
 717
 718         efi_map_start = __va(ia64_boot_param->efi_memmap);
 719         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 720         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 721
 722         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 723                 md = p;
 724                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 725                         if (md->attribute & EFI_MEMORY_UC)
 726                                 return md->phys_addr;
 727                 }
 728         }
 729         return 0;
 730 }
 731
 732 static struct kern_memdesc *
 733 kern_memory_descriptor (unsigned long phys_addr)
 734 {
 735         struct kern_memdesc *md;
 736
 737         for (md = kern_memmap; md->start != ~0UL; md++) {
 738                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 739                          return md;
 740         }
 741         return NULL;
 742 }
 743
 744 static efi_memory_desc_t *
 745 efi_memory_descriptor (unsigned long phys_addr)
 746 {
 747         void *efi_map_start, *efi_map_end, *p;
 748         efi_memory_desc_t *md;
 749         u64 efi_desc_size;
 750
 751         efi_map_start = __va(ia64_boot_param->efi_memmap);
 752         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 753         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 754
 755         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 756                 md = p;
 757
 758                 if (phys_addr - md->phys_addr < efi_md_size(md))
 759                          return md;
 760         }
 761         return NULL;
 762 }
 763
 764 static int
 765 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 766 {
 767         void *efi_map_start, *efi_map_end, *p;
 768         efi_memory_desc_t *md;
 769         u64 efi_desc_size;
 770         unsigned long end;
 771
 772         efi_map_start = __va(ia64_boot_param->efi_memmap);
 773         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 774         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 775
 776         end = phys_addr + size;
 777
 778         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 779                 md = p;
 780                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 781                         return 1;
 782         }
 783         return 0;
 784 }
 785
 786 u32
 787 efi_mem_type (unsigned long phys_addr)
 788 {
 789         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 790
 791         if (md)
 792                 return md->type;
 793         return 0;
 794 }
 795
 796 u64
 797 efi_mem_attributes (unsigned long phys_addr)
 798 {
 799         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 800
 801         if (md)
 802                 return md->attribute;
 803         return 0;
 804 }
 805 EXPORT_SYMBOL(efi_mem_attributes);
 806
 807 u64
 808 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 809 {
 810         unsigned long end = phys_addr + size;
 811         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 812         u64 attr;
 813
 814         if (!md)
 815                 return 0;
 816
 817         /*
 818          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 819          * the kernel that firmware needs this region mapped.
 820          */
 821         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 822         do {
 823                 unsigned long md_end = efi_md_end(md);
 824
 825                 if (end <= md_end)
 826                         return attr;
 827
 828                 md = efi_memory_descriptor(md_end);
 829                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 830                         return 0;
 831         } while (md);
 832         return 0;       /* never reached */
 833 }
 834
 835 u64
 836 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 837 {
 838         unsigned long end = phys_addr + size;
 839         struct kern_memdesc *md;
 840         u64 attr;
 841
 842         /*
 843          * This is a hack for ioremap calls before we set up kern_memmap.
 844          * Maybe we should do efi_memmap_init() earlier instead.
 845          */
 846         if (!kern_memmap) {
 847                 attr = efi_mem_attribute(phys_addr, size);
 848                 if (attr & EFI_MEMORY_WB)
 849                         return EFI_MEMORY_WB;
 850                 return 0;
 851         }
 852
 853         md = kern_memory_descriptor(phys_addr);
 854         if (!md)
 855                 return 0;
 856
 857         attr = md->attribute;
 858         do {
 859                 unsigned long md_end = kmd_end(md);
 860
 861                 if (end <= md_end)
 862                         return attr;
 863
 864                 md = kern_memory_descriptor(md_end);
 865                 if (!md || md->attribute != attr)
 866                         return 0;
 867         } while (md);
 868         return 0;       /* never reached */
 869 }
 870 EXPORT_SYMBOL(kern_mem_attribute);
 871
 872 int
 873 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
 874 {
 875         u64 attr;
 876
 877         /*
 878          * /dev/mem reads and writes use copy_to_user(), which implicitly
 879          * uses a granule-sized kernel identity mapping.  It's really
 880          * only safe to do this for regions in kern_memmap.  For more
 881          * details, see Documentation/ia64/aliasing.txt.
 882          */
 883         attr = kern_mem_attribute(phys_addr, size);
 884         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 885                 return 1;
 886         return 0;
 887 }
 888
 889 int
 890 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 891 {
 892         unsigned long phys_addr = pfn << PAGE_SHIFT;
 893         u64 attr;
 894
 895         attr = efi_mem_attribute(phys_addr, size);
 896
 897         /*
 898          * /dev/mem mmap uses normal user pages, so we don't need the entire
 899          * granule, but the entire region we're mapping must support the same
 900          * attribute.
 901          */
 902         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 903                 return 1;
 904
 905         /*
 906          * Intel firmware doesn't tell us about all the MMIO regions, so
 907          * in general we have to allow mmap requests.  But if EFI *does*
 908          * tell us about anything inside this region, we should deny it.
 909          * The user can always map a smaller region to avoid the overlap.
 910          */
 911         if (efi_memmap_intersects(phys_addr, size))
 912                 return 0;
 913
 914         return 1;
 915 }
 916
 917 pgprot_t
 918 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 919                      pgprot_t vma_prot)
 920 {
 921         unsigned long phys_addr = pfn << PAGE_SHIFT;
 922         u64 attr;
 923
 924         /*
 925          * For /dev/mem mmap, we use user mappings, but if the region is
 926          * in kern_memmap (and hence may be covered by a kernel mapping),
 927          * we must use the same attribute as the kernel mapping.
 928          */
 929         attr = kern_mem_attribute(phys_addr, size);
 930         if (attr & EFI_MEMORY_WB)
 931                 return pgprot_cacheable(vma_prot);
 932         else if (attr & EFI_MEMORY_UC)
 933                 return pgprot_noncached(vma_prot);
 934
 935         /*
 936          * Some chipsets don't support UC access to memory.  If
 937          * WB is supported, we prefer that.
 938          */
 939         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 940                 return pgprot_cacheable(vma_prot);
 941
 942         return pgprot_noncached(vma_prot);
 943 }
 944
 945 int __init
 946 efi_uart_console_only(void)
 947 {
 948         efi_status_t status;
 949         char *s, name[] = "ConOut";
 950         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 951         efi_char16_t *utf16, name_utf16[32];
 952         unsigned char data[1024];
 953         unsigned long size = sizeof(data);
 954         struct efi_generic_dev_path *hdr, *end_addr;
 955         int uart = 0;
 956
 957         /* Convert to UTF-16 */
 958         utf16 = name_utf16;
 959         s = name;
 960         while (*s)
 961                 *utf16++ = *s++ & 0x7f;
 962         *utf16 = 0;
 963
 964         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 965         if (status != EFI_SUCCESS) {
 966                 printk(KERN_ERR "No EFI %s variable?\n", name);
 967                 return 0;
 968         }
 969
 970         hdr = (struct efi_generic_dev_path *) data;
 971         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 972         while (hdr < end_addr) {
 973                 if (hdr->type == EFI_DEV_MSG &&
 974                     hdr->sub_type == EFI_DEV_MSG_UART)
 975                         uart = 1;
 976                 else if (hdr->type == EFI_DEV_END_PATH ||
 977                           hdr->type == EFI_DEV_END_PATH2) {
 978                         if (!uart)
 979                                 return 0;
 980                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 981                                 return 1;
 982                         uart = 0;
 983                 }
 984                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 985         }
 986         printk(KERN_ERR "Malformed %s value\n", name);
 987         return 0;
 988 }
 989
 990 /*
 991  * Look for the first granule aligned memory descriptor memory
 992  * that is big enough to hold EFI memory map. Make sure this
 993  * descriptor is atleast granule sized so it does not get trimmed
 994  */
 995 struct kern_memdesc *
 996 find_memmap_space (void)
 997 {
 998         u64     contig_low=0, contig_high=0;
 999         u64     as = 0, ae;
1000         void *efi_map_start, *efi_map_end, *p, *q;
1001         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1002         u64     space_needed, efi_desc_size;
1003         unsigned long total_mem = 0;
1004
1005         efi_map_start = __va(ia64_boot_param->efi_memmap);
1006         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1007         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1008
1009         /*
1010          * Worst case: we need 3 kernel descriptors for each efi descriptor
1011          * (if every entry has a WB part in the middle, and UC head and tail),
1012          * plus one for the end marker.
1013          */
1014         space_needed = sizeof(kern_memdesc_t) *
1015                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
1016
1017         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1018                 md = p;
1019                 if (!efi_wb(md)) {
1020                         continue;
1021                 }
1022                 if (pmd == NULL || !efi_wb(pmd) ||
1023                     efi_md_end(pmd) != md->phys_addr) {
1024                         contig_low = GRANULEROUNDUP(md->phys_addr);
1025                         contig_high = efi_md_end(md);
1026                         for (q = p + efi_desc_size; q < efi_map_end;
1027                              q += efi_desc_size) {
1028                                 check_md = q;
1029                                 if (!efi_wb(check_md))
1030                                         break;
1031                                 if (contig_high != check_md->phys_addr)
1032                                         break;
1033                                 contig_high = efi_md_end(check_md);
1034                         }
1035                         contig_high = GRANULEROUNDDOWN(contig_high);
1036                 }
1037                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1038                         continue;
1039
1040                 /* Round ends inward to granule boundaries */
1041                 as = max(contig_low, md->phys_addr);
1042                 ae = min(contig_high, efi_md_end(md));
1043
1044                 /* keep within max_addr= and min_addr= command line arg */
1045                 as = max(as, min_addr);
1046                 ae = min(ae, max_addr);
1047                 if (ae <= as)
1048                         continue;
1049
1050                 /* avoid going over mem= command line arg */
1051                 if (total_mem + (ae - as) > mem_limit)
1052                         ae -= total_mem + (ae - as) - mem_limit;
1053
1054                 if (ae <= as)
1055                         continue;
1056
1057                 if (ae - as > space_needed)
1058                         break;
1059         }
1060         if (p >= efi_map_end)
1061                 panic("Can't allocate space for kernel memory descriptors");
1062
1063         return __va(as);
1064 }
1065
1066 /*
1067  * Walk the EFI memory map and gather all memory available for kernel
1068  * to use.  We can allocate partial granules only if the unavailable
1069  * parts exist, and are WB.
1070  */
1071 unsigned long
1072 efi_memmap_init(u64 *s, u64 *e)
1073 {
1074         struct kern_memdesc *k, *prev = NULL;
1075         u64     contig_low=0, contig_high=0;
1076         u64     as, ae, lim;
1077         void *efi_map_start, *efi_map_end, *p, *q;
1078         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1079         u64     efi_desc_size;
1080         unsigned long total_mem = 0;
1081
1082         k = kern_memmap = find_memmap_space();
1083
1084         efi_map_start = __va(ia64_boot_param->efi_memmap);
1085         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1086         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1087
1088         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1089                 md = p;
1090                 if (!efi_wb(md)) {
1091                         if (efi_uc(md) &&
1092                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1093                              md->type == EFI_BOOT_SERVICES_DATA)) {
1094                                 k->attribute = EFI_MEMORY_UC;
1095                                 k->start = md->phys_addr;
1096                                 k->num_pages = md->num_pages;
1097                                 k++;
1098                         }
1099                         continue;
1100                 }
1101                 if (pmd == NULL || !efi_wb(pmd) ||
1102                     efi_md_end(pmd) != md->phys_addr) {
1103                         contig_low = GRANULEROUNDUP(md->phys_addr);
1104                         contig_high = efi_md_end(md);
1105                         for (q = p + efi_desc_size; q < efi_map_end;
1106                              q += efi_desc_size) {
1107                                 check_md = q;
1108                                 if (!efi_wb(check_md))
1109                                         break;
1110                                 if (contig_high != check_md->phys_addr)
1111                                         break;
1112                                 contig_high = efi_md_end(check_md);
1113                         }
1114                         contig_high = GRANULEROUNDDOWN(contig_high);
1115                 }
1116                 if (!is_memory_available(md))
1117                         continue;
1118
1119                 /*
1120                  * Round ends inward to granule boundaries
1121                  * Give trimmings to uncached allocator
1122                  */
1123                 if (md->phys_addr < contig_low) {
1124                         lim = min(efi_md_end(md), contig_low);
1125                         if (efi_uc(md)) {
1126                                 if (k > kern_memmap &&
1127                                     (k-1)->attribute == EFI_MEMORY_UC &&
1128                                     kmd_end(k-1) == md->phys_addr) {
1129                                         (k-1)->num_pages +=
1130                                                 (lim - md->phys_addr)
1131                                                 >> EFI_PAGE_SHIFT;
1132                                 } else {
1133                                         k->attribute = EFI_MEMORY_UC;
1134                                         k->start = md->phys_addr;
1135                                         k->num_pages = (lim - md->phys_addr)
1136                                                 >> EFI_PAGE_SHIFT;
1137                                         k++;
1138                                 }
1139                         }
1140                         as = contig_low;
1141                 } else
1142                         as = md->phys_addr;
1143
1144                 if (efi_md_end(md) > contig_high) {
1145                         lim = max(md->phys_addr, contig_high);
1146                         if (efi_uc(md)) {
1147                                 if (lim == md->phys_addr && k > kern_memmap &&
1148                                     (k-1)->attribute == EFI_MEMORY_UC &&
1149                                     kmd_end(k-1) == md->phys_addr) {
1150                                         (k-1)->num_pages += md->num_pages;
1151                                 } else {
1152                                         k->attribute = EFI_MEMORY_UC;
1153                                         k->start = lim;
1154                                         k->num_pages = (efi_md_end(md) - lim)
1155                                                 >> EFI_PAGE_SHIFT;
1156                                         k++;
1157                                 }
1158                         }
1159                         ae = contig_high;
1160                 } else
1161                         ae = efi_md_end(md);
1162
1163                 /* keep within max_addr= and min_addr= command line arg */
1164                 as = max(as, min_addr);
1165                 ae = min(ae, max_addr);
1166                 if (ae <= as)
1167                         continue;
1168
1169                 /* avoid going over mem= command line arg */
1170                 if (total_mem + (ae - as) > mem_limit)
1171                         ae -= total_mem + (ae - as) - mem_limit;
1172
1173                 if (ae <= as)
1174                         continue;
1175                 if (prev && kmd_end(prev) == md->phys_addr) {
1176                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1177                         total_mem += ae - as;
1178                         continue;
1179                 }
1180                 k->attribute = EFI_MEMORY_WB;
1181                 k->start = as;
1182                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1183                 total_mem += ae - as;
1184                 prev = k++;
1185         }
1186         k->start = ~0L; /* end-marker */
1187
1188         /* reserve the memory we are using for kern_memmap */
1189         *s = (u64)kern_memmap;
1190         *e = (u64)++k;
1191
1192         return total_mem;
1193 }
1194
1195 void
1196 efi_initialize_iomem_resources(struct resource *code_resource,
1197                                struct resource *data_resource,
1198                                struct resource *bss_resource)
1199 {
1200         struct resource *res;
1201         void *efi_map_start, *efi_map_end, *p;
1202         efi_memory_desc_t *md;
1203         u64 efi_desc_size;
1204         char *name;
1205         unsigned long flags;
1206
1207         efi_map_start = __va(ia64_boot_param->efi_memmap);
1208         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1209         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1210
1211         res = NULL;
1212
1213         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1214                 md = p;
1215
1216                 if (md->num_pages == 0) /* should not happen */
1217                         continue;
1218
1219                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1220                 switch (md->type) {
1221
1222                         case EFI_MEMORY_MAPPED_IO:
1223                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1224                                 continue;
1225
1226                         case EFI_LOADER_CODE:
1227                         case EFI_LOADER_DATA:
1228                         case EFI_BOOT_SERVICES_DATA:
1229                         case EFI_BOOT_SERVICES_CODE:
1230                         case EFI_CONVENTIONAL_MEMORY:
1231                                 if (md->attribute & EFI_MEMORY_WP) {
1232                                         name = "System ROM";
1233                                         flags |= IORESOURCE_READONLY;
1234                                 } else if (md->attribute == EFI_MEMORY_UC)
1235                                         name = "Uncached RAM";
1236                                 else
1237                                         name = "System RAM";
1238                                 break;
1239
1240                         case EFI_ACPI_MEMORY_NVS:
1241                                 name = "ACPI Non-volatile Storage";
1242                                 break;
1243
1244                         case EFI_UNUSABLE_MEMORY:
1245                                 name = "reserved";
1246                                 flags |= IORESOURCE_DISABLED;
1247                                 break;
1248
1249                         case EFI_RESERVED_TYPE:
1250                         case EFI_RUNTIME_SERVICES_CODE:
1251                         case EFI_RUNTIME_SERVICES_DATA:
1252                         case EFI_ACPI_RECLAIM_MEMORY:
1253                         default:
1254                                 name = "reserved";
1255                                 break;
1256                 }
1257
1258                 if ((res = kzalloc(sizeof(struct resource),
1259                                    GFP_KERNEL)) == NULL) {
1260                         printk(KERN_ERR
1261                                "failed to allocate resource for iomem\n");
1262                         return;
1263                 }
1264
1265                 res->name = name;
1266                 res->start = md->phys_addr;
1267                 res->end = md->phys_addr + efi_md_size(md) - 1;
1268                 res->flags = flags;
1269
1270                 if (insert_resource(&iomem_resource, res) < 0)
1271                         kfree(res);
1272                 else {
1273                         /*
1274                          * We don't know which region contains
1275                          * kernel data so we try it repeatedly and
1276                          * let the resource manager test it.
1277                          */
1278                         insert_resource(res, code_resource);
1279                         insert_resource(res, data_resource);
1280                         insert_resource(res, bss_resource);
1281 #ifdef CONFIG_KEXEC
1282                         insert_resource(res, &efi_memmap_res);
1283                         insert_resource(res, &boot_param_res);
1284                         if (crashk_res.end > crashk_res.start)
1285                                 insert_resource(res, &crashk_res);
1286 #endif
1287                 }
1288         }
1289 }
1290
1291 #ifdef CONFIG_KEXEC
1292 /* find a block of memory aligned to 64M exclude reserved regions
1293    rsvd_regions are sorted
1294  */
1295 unsigned long __init
1296 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1297 {
1298         int i;
1299         u64 start, end;
1300         u64 alignment = 1UL << _PAGE_SIZE_64M;
1301         void *efi_map_start, *efi_map_end, *p;
1302         efi_memory_desc_t *md;
1303         u64 efi_desc_size;
1304
1305         efi_map_start = __va(ia64_boot_param->efi_memmap);
1306         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1307         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1308
1309         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1310                 md = p;
1311                 if (!efi_wb(md))
1312                         continue;
1313                 start = ALIGN(md->phys_addr, alignment);
1314                 end = efi_md_end(md);
1315                 for (i = 0; i < n; i++) {
1316                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1317                                 if (__pa(r[i].start) > start + size)
1318                                         return start;
1319                                 start = ALIGN(__pa(r[i].end), alignment);
1320                                 if (i < n-1 &&
1321                                     __pa(r[i+1].start) < start + size)
1322                                         continue;
1323                                 else
1324                                         break;
1325                         }
1326                 }
1327                 if (end > start + size)
1328                         return start;
1329         }
1330
1331         printk(KERN_WARNING
1332                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1333         return ~0UL;
1334 }
1335 #endif
1336
1337 #ifdef CONFIG_CRASH_DUMP
1338 /* locate the size find a the descriptor at a certain address */
1339 unsigned long __init
1340 vmcore_find_descriptor_size (unsigned long address)
1341 {
1342         void *efi_map_start, *efi_map_end, *p;
1343         efi_memory_desc_t *md;
1344         u64 efi_desc_size;
1345         unsigned long ret = 0;
1346
1347         efi_map_start = __va(ia64_boot_param->efi_memmap);
1348         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1349         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1350
1351         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1352                 md = p;
1353                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1354                     && md->phys_addr == address) {
1355                         ret = efi_md_size(md);
1356                         break;
1357                 }
1358         }
1359
1360         if (ret == 0)
1361                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1362
1363         return ret;
1364 }
1365 #endif