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 static __initdata unsigned long palo_phys;
  48
  49 static __initdata efi_config_table_type_t arch_tables[] = {
  50         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
  51         {NULL_GUID, NULL, 0},
  52 };
  53
  54 extern efi_status_t efi_call_phys (void *, ...);
  55
  56 static efi_runtime_services_t *runtime;
  57 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  58
  59 #define efi_call_virt(f, args...)       (*(f))(args)
  60
  61 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  62 static efi_status_t                                                            \
  63 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  64 {                                                                              \
  65         struct ia64_fpreg fr[6];                                               \
  66         efi_time_cap_t *atc = NULL;                                            \
  67         efi_status_t ret;                                                      \
  68                                                                                \
  69         if (tc)                                                                \
  70                 atc = adjust_arg(tc);                                          \
  71         ia64_save_scratch_fpregs(fr);                                          \
  72         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  73                                 adjust_arg(tm), atc);                          \
  74         ia64_load_scratch_fpregs(fr);                                          \
  75         return ret;                                                            \
  76 }
  77
  78 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  79 static efi_status_t                                                            \
  80 prefix##_set_time (efi_time_t *tm)                                             \
  81 {                                                                              \
  82         struct ia64_fpreg fr[6];                                               \
  83         efi_status_t ret;                                                      \
  84                                                                                \
  85         ia64_save_scratch_fpregs(fr);                                          \
  86         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
  87                                 adjust_arg(tm));                               \
  88         ia64_load_scratch_fpregs(fr);                                          \
  89         return ret;                                                            \
  90 }
  91
  92 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
  93 static efi_status_t                                                            \
  94 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
  95                           efi_time_t *tm)                                      \
  96 {                                                                              \
  97         struct ia64_fpreg fr[6];                                               \
  98         efi_status_t ret;                                                      \
  99                                                                                \
 100         ia64_save_scratch_fpregs(fr);                                          \
 101         ret = efi_call_##prefix(                                               \
 102                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
 103                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
 104         ia64_load_scratch_fpregs(fr);                                          \
 105         return ret;                                                            \
 106 }
 107
 108 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 109 static efi_status_t                                                            \
 110 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 111 {                                                                              \
 112         struct ia64_fpreg fr[6];                                               \
 113         efi_time_t *atm = NULL;                                                \
 114         efi_status_t ret;                                                      \
 115                                                                                \
 116         if (tm)                                                                \
 117                 atm = adjust_arg(tm);                                          \
 118         ia64_save_scratch_fpregs(fr);                                          \
 119         ret = efi_call_##prefix(                                               \
 120                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 121                 enabled, atm);                                                 \
 122         ia64_load_scratch_fpregs(fr);                                          \
 123         return ret;                                                            \
 124 }
 125
 126 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 127 static efi_status_t                                                            \
 128 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 129                        unsigned long *data_size, void *data)                   \
 130 {                                                                              \
 131         struct ia64_fpreg fr[6];                                               \
 132         u32 *aattr = NULL;                                                     \
 133         efi_status_t ret;                                                      \
 134                                                                                \
 135         if (attr)                                                              \
 136                 aattr = adjust_arg(attr);                                      \
 137         ia64_save_scratch_fpregs(fr);                                          \
 138         ret = efi_call_##prefix(                                               \
 139                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 140                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 141                 adjust_arg(data_size), adjust_arg(data));                      \
 142         ia64_load_scratch_fpregs(fr);                                          \
 143         return ret;                                                            \
 144 }
 145
 146 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 147 static efi_status_t                                                            \
 148 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 149                             efi_guid_t *vendor)                                \
 150 {                                                                              \
 151         struct ia64_fpreg fr[6];                                               \
 152         efi_status_t ret;                                                      \
 153                                                                                \
 154         ia64_save_scratch_fpregs(fr);                                          \
 155         ret = efi_call_##prefix(                                               \
 156                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 157                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 158         ia64_load_scratch_fpregs(fr);                                          \
 159         return ret;                                                            \
 160 }
 161
 162 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 163 static efi_status_t                                                            \
 164 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 165                        u32 attr, unsigned long data_size,                      \
 166                        void *data)                                             \
 167 {                                                                              \
 168         struct ia64_fpreg fr[6];                                               \
 169         efi_status_t ret;                                                      \
 170                                                                                \
 171         ia64_save_scratch_fpregs(fr);                                          \
 172         ret = efi_call_##prefix(                                               \
 173                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 174                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 175                 adjust_arg(data));                                             \
 176         ia64_load_scratch_fpregs(fr);                                          \
 177         return ret;                                                            \
 178 }
 179
 180 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 181 static efi_status_t                                                            \
 182 prefix##_get_next_high_mono_count (u32 *count)                                 \
 183 {                                                                              \
 184         struct ia64_fpreg fr[6];                                               \
 185         efi_status_t ret;                                                      \
 186                                                                                \
 187         ia64_save_scratch_fpregs(fr);                                          \
 188         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 189                                 __va(runtime->get_next_high_mono_count),       \
 190                                 adjust_arg(count));                            \
 191         ia64_load_scratch_fpregs(fr);                                          \
 192         return ret;                                                            \
 193 }
 194
 195 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 196 static void                                                                    \
 197 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 198                        unsigned long data_size, efi_char16_t *data)            \
 199 {                                                                              \
 200         struct ia64_fpreg fr[6];                                               \
 201         efi_char16_t *adata = NULL;                                            \
 202                                                                                \
 203         if (data)                                                              \
 204                 adata = adjust_arg(data);                                      \
 205                                                                                \
 206         ia64_save_scratch_fpregs(fr);                                          \
 207         efi_call_##prefix(                                                     \
 208                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 209                 reset_type, status, data_size, adata);                         \
 210         /* should not return, but just in case... */                           \
 211         ia64_load_scratch_fpregs(fr);                                          \
 212 }
 213
 214 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 215
 216 STUB_GET_TIME(phys, phys_ptr)
 217 STUB_SET_TIME(phys, phys_ptr)
 218 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 219 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 220 STUB_GET_VARIABLE(phys, phys_ptr)
 221 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 222 STUB_SET_VARIABLE(phys, phys_ptr)
 223 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 224 STUB_RESET_SYSTEM(phys, phys_ptr)
 225
 226 #define id(arg) arg
 227
 228 STUB_GET_TIME(virt, id)
 229 STUB_SET_TIME(virt, id)
 230 STUB_GET_WAKEUP_TIME(virt, id)
 231 STUB_SET_WAKEUP_TIME(virt, id)
 232 STUB_GET_VARIABLE(virt, id)
 233 STUB_GET_NEXT_VARIABLE(virt, id)
 234 STUB_SET_VARIABLE(virt, id)
 235 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 236 STUB_RESET_SYSTEM(virt, id)
 237
 238 void
 239 efi_gettimeofday (struct timespec *ts)
 240 {
 241         efi_time_t tm;
 242
 243         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 244                 memset(ts, 0, sizeof(*ts));
 245                 return;
 246         }
 247
 248         ts->tv_sec = mktime(tm.year, tm.month, tm.day,
 249                             tm.hour, tm.minute, tm.second);
 250         ts->tv_nsec = tm.nanosecond;
 251 }
 252
 253 static int
 254 is_memory_available (efi_memory_desc_t *md)
 255 {
 256         if (!(md->attribute & EFI_MEMORY_WB))
 257                 return 0;
 258
 259         switch (md->type) {
 260               case EFI_LOADER_CODE:
 261               case EFI_LOADER_DATA:
 262               case EFI_BOOT_SERVICES_CODE:
 263               case EFI_BOOT_SERVICES_DATA:
 264               case EFI_CONVENTIONAL_MEMORY:
 265                 return 1;
 266         }
 267         return 0;
 268 }
 269
 270 typedef struct kern_memdesc {
 271         u64 attribute;
 272         u64 start;
 273         u64 num_pages;
 274 } kern_memdesc_t;
 275
 276 static kern_memdesc_t *kern_memmap;
 277
 278 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 279
 280 static inline u64
 281 kmd_end(kern_memdesc_t *kmd)
 282 {
 283         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 284 }
 285
 286 static inline u64
 287 efi_md_end(efi_memory_desc_t *md)
 288 {
 289         return (md->phys_addr + efi_md_size(md));
 290 }
 291
 292 static inline int
 293 efi_wb(efi_memory_desc_t *md)
 294 {
 295         return (md->attribute & EFI_MEMORY_WB);
 296 }
 297
 298 static inline int
 299 efi_uc(efi_memory_desc_t *md)
 300 {
 301         return (md->attribute & EFI_MEMORY_UC);
 302 }
 303
 304 static void
 305 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 306 {
 307         kern_memdesc_t *k;
 308         u64 start, end, voff;
 309
 310         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 311         for (k = kern_memmap; k->start != ~0UL; k++) {
 312                 if (k->attribute != attr)
 313                         continue;
 314                 start = PAGE_ALIGN(k->start);
 315                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 316                 if (start < end)
 317                         if ((*callback)(start + voff, end + voff, arg) < 0)
 318                                 return;
 319         }
 320 }
 321
 322 /*
 323  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 324  * descriptor that has memory that is available for OS use.
 325  */
 326 void
 327 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 328 {
 329         walk(callback, arg, EFI_MEMORY_WB);
 330 }
 331
 332 /*
 333  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 334  * descriptor that has memory that is available for uncached allocator.
 335  */
 336 void
 337 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 338 {
 339         walk(callback, arg, EFI_MEMORY_UC);
 340 }
 341
 342 /*
 343  * Look for the PAL_CODE region reported by EFI and map it using an
 344  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 345  * Abstraction Layer chapter 11 in ADAG
 346  */
 347 void *
 348 efi_get_pal_addr (void)
 349 {
 350         void *efi_map_start, *efi_map_end, *p;
 351         efi_memory_desc_t *md;
 352         u64 efi_desc_size;
 353         int pal_code_count = 0;
 354         u64 vaddr, mask;
 355
 356         efi_map_start = __va(ia64_boot_param->efi_memmap);
 357         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 358         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 359
 360         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 361                 md = p;
 362                 if (md->type != EFI_PAL_CODE)
 363                         continue;
 364
 365                 if (++pal_code_count > 1) {
 366                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 367                                "dropped @ %llx\n", md->phys_addr);
 368                         continue;
 369                 }
 370                 /*
 371                  * The only ITLB entry in region 7 that is used is the one
 372                  * installed by __start().  That entry covers a 64MB range.
 373                  */
 374                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 375                 vaddr = PAGE_OFFSET + md->phys_addr;
 376
 377                 /*
 378                  * We must check that the PAL mapping won't overlap with the
 379                  * kernel mapping.
 380                  *
 381                  * PAL code is guaranteed to be aligned on a power of 2 between
 382                  * 4k and 256KB and that only one ITR is needed to map it. This
 383                  * implies that the PAL code is always aligned on its size,
 384                  * i.e., the closest matching page size supported by the TLB.
 385                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 386                  * it is bigger than 64MB (very unlikely!).  So for now the
 387                  * following test is enough to determine whether or not we need
 388                  * a dedicated ITR for the PAL code.
 389                  */
 390                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 391                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 392                                __func__);
 393                         continue;
 394                 }
 395
 396                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 397                         panic("Whoa!  PAL code size bigger than a granule!");
 398
 399 #if EFI_DEBUG
 400                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 401
 402                 printk(KERN_INFO "CPU %d: mapping PAL code "
 403                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 404                        smp_processor_id(), md->phys_addr,
 405                        md->phys_addr + efi_md_size(md),
 406                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 407 #endif
 408                 return __va(md->phys_addr);
 409         }
 410         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 411                __func__);
 412         return NULL;
 413 }
 414
 415
 416 static u8 __init palo_checksum(u8 *buffer, u32 length)
 417 {
 418         u8 sum = 0;
 419         u8 *end = buffer + length;
 420
 421         while (buffer < end)
 422                 sum = (u8) (sum + *(buffer++));
 423
 424         return sum;
 425 }
 426
 427 /*
 428  * Parse and handle PALO table which is published at:
 429  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 430  */
 431 static void __init handle_palo(unsigned long phys_addr)
 432 {
 433         struct palo_table *palo = __va(phys_addr);
 434         u8  checksum;
 435
 436         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 437                 printk(KERN_INFO "PALO signature incorrect.\n");
 438                 return;
 439         }
 440
 441         checksum = palo_checksum((u8 *)palo, palo->length);
 442         if (checksum) {
 443                 printk(KERN_INFO "PALO checksum incorrect.\n");
 444                 return;
 445         }
 446
 447         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 448 }
 449
 450 void
 451 efi_map_pal_code (void)
 452 {
 453         void *pal_vaddr = efi_get_pal_addr ();
 454         u64 psr;
 455
 456         if (!pal_vaddr)
 457                 return;
 458
 459         /*
 460          * Cannot write to CRx with PSR.ic=1
 461          */
 462         psr = ia64_clear_ic();
 463         ia64_itr(0x1, IA64_TR_PALCODE,
 464                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 465                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 466                  IA64_GRANULE_SHIFT);
 467         paravirt_dv_serialize_data();
 468         ia64_set_psr(psr);              /* restore psr */
 469 }
 470
 471 void __init
 472 efi_init (void)
 473 {
 474         void *efi_map_start, *efi_map_end;
 475         efi_char16_t *c16;
 476         u64 efi_desc_size;
 477         char *cp, vendor[100] = "unknown";
 478         int i;
 479
 480         set_bit(EFI_BOOT, &efi.flags);
 481         set_bit(EFI_64BIT, &efi.flags);
 482
 483         /*
 484          * It's too early to be able to use the standard kernel command line
 485          * support...
 486          */
 487         for (cp = boot_command_line; *cp; ) {
 488                 if (memcmp(cp, "mem=", 4) == 0) {
 489                         mem_limit = memparse(cp + 4, &cp);
 490                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 491                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 492                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 493                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 494                 } else {
 495                         while (*cp != ' ' && *cp)
 496                                 ++cp;
 497                         while (*cp == ' ')
 498                                 ++cp;
 499                 }
 500         }
 501         if (min_addr != 0UL)
 502                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 503                        min_addr >> 20);
 504         if (max_addr != ~0UL)
 505                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 506                        max_addr >> 20);
 507
 508         efi.systab = __va(ia64_boot_param->efi_systab);
 509
 510         /*
 511          * Verify the EFI Table
 512          */
 513         if (efi.systab == NULL)
 514                 panic("Whoa! Can't find EFI system table.\n");
 515         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 516                 panic("Whoa! EFI system table signature incorrect\n");
 517         if ((efi.systab->hdr.revision >> 16) == 0)
 518                 printk(KERN_WARNING "Warning: EFI system table version "
 519                        "%d.%02d, expected 1.00 or greater\n",
 520                        efi.systab->hdr.revision >> 16,
 521                        efi.systab->hdr.revision & 0xffff);
 522
 523         /* Show what we know for posterity */
 524         c16 = __va(efi.systab->fw_vendor);
 525         if (c16) {
 526                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 527                         vendor[i] = *c16++;
 528                 vendor[i] = '\0';
 529         }
 530
 531         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 532                efi.systab->hdr.revision >> 16,
 533                efi.systab->hdr.revision & 0xffff, vendor);
 534
 535         set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 536
 537         palo_phys      = EFI_INVALID_TABLE_ADDR;
 538
 539         if (efi_config_init(arch_tables) != 0)
 540                 return;
 541
 542         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 543                 handle_palo(palo_phys);
 544
 545         runtime = __va(efi.systab->runtime);
 546         efi.get_time = phys_get_time;
 547         efi.set_time = phys_set_time;
 548         efi.get_wakeup_time = phys_get_wakeup_time;
 549         efi.set_wakeup_time = phys_set_wakeup_time;
 550         efi.get_variable = phys_get_variable;
 551         efi.get_next_variable = phys_get_next_variable;
 552         efi.set_variable = phys_set_variable;
 553         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 554         efi.reset_system = phys_reset_system;
 555
 556         efi_map_start = __va(ia64_boot_param->efi_memmap);
 557         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 558         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 559
 560 #if EFI_DEBUG
 561         /* print EFI memory map: */
 562         {
 563                 efi_memory_desc_t *md;
 564                 void *p;
 565
 566                 for (i = 0, p = efi_map_start; p < efi_map_end;
 567                      ++i, p += efi_desc_size)
 568                 {
 569                         const char *unit;
 570                         unsigned long size;
 571
 572                         md = p;
 573                         size = md->num_pages << EFI_PAGE_SHIFT;
 574
 575                         if ((size >> 40) > 0) {
 576                                 size >>= 40;
 577                                 unit = "TB";
 578                         } else if ((size >> 30) > 0) {
 579                                 size >>= 30;
 580                                 unit = "GB";
 581                         } else if ((size >> 20) > 0) {
 582                                 size >>= 20;
 583                                 unit = "MB";
 584                         } else {
 585                                 size >>= 10;
 586                                 unit = "KB";
 587                         }
 588
 589                         printk("mem%02d: type=%2u, attr=0x%016lx, "
 590                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 591                                i, md->type, md->attribute, md->phys_addr,
 592                                md->phys_addr + efi_md_size(md), size, unit);
 593                 }
 594         }
 595 #endif
 596
 597         efi_map_pal_code();
 598         efi_enter_virtual_mode();
 599 }
 600
 601 void
 602 efi_enter_virtual_mode (void)
 603 {
 604         void *efi_map_start, *efi_map_end, *p;
 605         efi_memory_desc_t *md;
 606         efi_status_t status;
 607         u64 efi_desc_size;
 608
 609         efi_map_start = __va(ia64_boot_param->efi_memmap);
 610         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 611         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 612
 613         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 614                 md = p;
 615                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 616                         /*
 617                          * Some descriptors have multiple bits set, so the
 618                          * order of the tests is relevant.
 619                          */
 620                         if (md->attribute & EFI_MEMORY_WB) {
 621                                 md->virt_addr = (u64) __va(md->phys_addr);
 622                         } else if (md->attribute & EFI_MEMORY_UC) {
 623                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 624                         } else if (md->attribute & EFI_MEMORY_WC) {
 625 #if 0
 626                                 md->virt_addr = ia64_remap(md->phys_addr,
 627                                                            (_PAGE_A |
 628                                                             _PAGE_P |
 629                                                             _PAGE_D |
 630                                                             _PAGE_MA_WC |
 631                                                             _PAGE_PL_0 |
 632                                                             _PAGE_AR_RW));
 633 #else
 634                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 635                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 636 #endif
 637                         } else if (md->attribute & EFI_MEMORY_WT) {
 638 #if 0
 639                                 md->virt_addr = ia64_remap(md->phys_addr,
 640                                                            (_PAGE_A |
 641                                                             _PAGE_P |
 642                                                             _PAGE_D |
 643                                                             _PAGE_MA_WT |
 644                                                             _PAGE_PL_0 |
 645                                                             _PAGE_AR_RW));
 646 #else
 647                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 648                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 649 #endif
 650                         }
 651                 }
 652         }
 653
 654         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 655                                ia64_boot_param->efi_memmap_size,
 656                                efi_desc_size,
 657                                ia64_boot_param->efi_memdesc_version,
 658                                ia64_boot_param->efi_memmap);
 659         if (status != EFI_SUCCESS) {
 660                 printk(KERN_WARNING "warning: unable to switch EFI into "
 661                        "virtual mode (status=%lu)\n", status);
 662                 return;
 663         }
 664
 665         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 666
 667         /*
 668          * Now that EFI is in virtual mode, we call the EFI functions more
 669          * efficiently:
 670          */
 671         efi.get_time = virt_get_time;
 672         efi.set_time = virt_set_time;
 673         efi.get_wakeup_time = virt_get_wakeup_time;
 674         efi.set_wakeup_time = virt_set_wakeup_time;
 675         efi.get_variable = virt_get_variable;
 676         efi.get_next_variable = virt_get_next_variable;
 677         efi.set_variable = virt_set_variable;
 678         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 679         efi.reset_system = virt_reset_system;
 680 }
 681
 682 /*
 683  * Walk the EFI memory map looking for the I/O port range.  There can only be
 684  * one entry of this type, other I/O port ranges should be described via ACPI.
 685  */
 686 u64
 687 efi_get_iobase (void)
 688 {
 689         void *efi_map_start, *efi_map_end, *p;
 690         efi_memory_desc_t *md;
 691         u64 efi_desc_size;
 692
 693         efi_map_start = __va(ia64_boot_param->efi_memmap);
 694         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 695         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 696
 697         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 698                 md = p;
 699                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 700                         if (md->attribute & EFI_MEMORY_UC)
 701                                 return md->phys_addr;
 702                 }
 703         }
 704         return 0;
 705 }
 706
 707 static struct kern_memdesc *
 708 kern_memory_descriptor (unsigned long phys_addr)
 709 {
 710         struct kern_memdesc *md;
 711
 712         for (md = kern_memmap; md->start != ~0UL; md++) {
 713                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 714                          return md;
 715         }
 716         return NULL;
 717 }
 718
 719 static efi_memory_desc_t *
 720 efi_memory_descriptor (unsigned long phys_addr)
 721 {
 722         void *efi_map_start, *efi_map_end, *p;
 723         efi_memory_desc_t *md;
 724         u64 efi_desc_size;
 725
 726         efi_map_start = __va(ia64_boot_param->efi_memmap);
 727         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 728         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 729
 730         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 731                 md = p;
 732
 733                 if (phys_addr - md->phys_addr < efi_md_size(md))
 734                          return md;
 735         }
 736         return NULL;
 737 }
 738
 739 static int
 740 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 741 {
 742         void *efi_map_start, *efi_map_end, *p;
 743         efi_memory_desc_t *md;
 744         u64 efi_desc_size;
 745         unsigned long end;
 746
 747         efi_map_start = __va(ia64_boot_param->efi_memmap);
 748         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 749         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 750
 751         end = phys_addr + size;
 752
 753         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 754                 md = p;
 755                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 756                         return 1;
 757         }
 758         return 0;
 759 }
 760
 761 u32
 762 efi_mem_type (unsigned long phys_addr)
 763 {
 764         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 765
 766         if (md)
 767                 return md->type;
 768         return 0;
 769 }
 770
 771 u64
 772 efi_mem_attributes (unsigned long phys_addr)
 773 {
 774         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 775
 776         if (md)
 777                 return md->attribute;
 778         return 0;
 779 }
 780 EXPORT_SYMBOL(efi_mem_attributes);
 781
 782 u64
 783 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 784 {
 785         unsigned long end = phys_addr + size;
 786         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 787         u64 attr;
 788
 789         if (!md)
 790                 return 0;
 791
 792         /*
 793          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 794          * the kernel that firmware needs this region mapped.
 795          */
 796         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 797         do {
 798                 unsigned long md_end = efi_md_end(md);
 799
 800                 if (end <= md_end)
 801                         return attr;
 802
 803                 md = efi_memory_descriptor(md_end);
 804                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 805                         return 0;
 806         } while (md);
 807         return 0;       /* never reached */
 808 }
 809
 810 u64
 811 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 812 {
 813         unsigned long end = phys_addr + size;
 814         struct kern_memdesc *md;
 815         u64 attr;
 816
 817         /*
 818          * This is a hack for ioremap calls before we set up kern_memmap.
 819          * Maybe we should do efi_memmap_init() earlier instead.
 820          */
 821         if (!kern_memmap) {
 822                 attr = efi_mem_attribute(phys_addr, size);
 823                 if (attr & EFI_MEMORY_WB)
 824                         return EFI_MEMORY_WB;
 825                 return 0;
 826         }
 827
 828         md = kern_memory_descriptor(phys_addr);
 829         if (!md)
 830                 return 0;
 831
 832         attr = md->attribute;
 833         do {
 834                 unsigned long md_end = kmd_end(md);
 835
 836                 if (end <= md_end)
 837                         return attr;
 838
 839                 md = kern_memory_descriptor(md_end);
 840                 if (!md || md->attribute != attr)
 841                         return 0;
 842         } while (md);
 843         return 0;       /* never reached */
 844 }
 845 EXPORT_SYMBOL(kern_mem_attribute);
 846
 847 int
 848 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
 849 {
 850         u64 attr;
 851
 852         /*
 853          * /dev/mem reads and writes use copy_to_user(), which implicitly
 854          * uses a granule-sized kernel identity mapping.  It's really
 855          * only safe to do this for regions in kern_memmap.  For more
 856          * details, see Documentation/ia64/aliasing.txt.
 857          */
 858         attr = kern_mem_attribute(phys_addr, size);
 859         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 860                 return 1;
 861         return 0;
 862 }
 863
 864 int
 865 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 866 {
 867         unsigned long phys_addr = pfn << PAGE_SHIFT;
 868         u64 attr;
 869
 870         attr = efi_mem_attribute(phys_addr, size);
 871
 872         /*
 873          * /dev/mem mmap uses normal user pages, so we don't need the entire
 874          * granule, but the entire region we're mapping must support the same
 875          * attribute.
 876          */
 877         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 878                 return 1;
 879
 880         /*
 881          * Intel firmware doesn't tell us about all the MMIO regions, so
 882          * in general we have to allow mmap requests.  But if EFI *does*
 883          * tell us about anything inside this region, we should deny it.
 884          * The user can always map a smaller region to avoid the overlap.
 885          */
 886         if (efi_memmap_intersects(phys_addr, size))
 887                 return 0;
 888
 889         return 1;
 890 }
 891
 892 pgprot_t
 893 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 894                      pgprot_t vma_prot)
 895 {
 896         unsigned long phys_addr = pfn << PAGE_SHIFT;
 897         u64 attr;
 898
 899         /*
 900          * For /dev/mem mmap, we use user mappings, but if the region is
 901          * in kern_memmap (and hence may be covered by a kernel mapping),
 902          * we must use the same attribute as the kernel mapping.
 903          */
 904         attr = kern_mem_attribute(phys_addr, size);
 905         if (attr & EFI_MEMORY_WB)
 906                 return pgprot_cacheable(vma_prot);
 907         else if (attr & EFI_MEMORY_UC)
 908                 return pgprot_noncached(vma_prot);
 909
 910         /*
 911          * Some chipsets don't support UC access to memory.  If
 912          * WB is supported, we prefer that.
 913          */
 914         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 915                 return pgprot_cacheable(vma_prot);
 916
 917         return pgprot_noncached(vma_prot);
 918 }
 919
 920 int __init
 921 efi_uart_console_only(void)
 922 {
 923         efi_status_t status;
 924         char *s, name[] = "ConOut";
 925         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 926         efi_char16_t *utf16, name_utf16[32];
 927         unsigned char data[1024];
 928         unsigned long size = sizeof(data);
 929         struct efi_generic_dev_path *hdr, *end_addr;
 930         int uart = 0;
 931
 932         /* Convert to UTF-16 */
 933         utf16 = name_utf16;
 934         s = name;
 935         while (*s)
 936                 *utf16++ = *s++ & 0x7f;
 937         *utf16 = 0;
 938
 939         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 940         if (status != EFI_SUCCESS) {
 941                 printk(KERN_ERR "No EFI %s variable?\n", name);
 942                 return 0;
 943         }
 944
 945         hdr = (struct efi_generic_dev_path *) data;
 946         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 947         while (hdr < end_addr) {
 948                 if (hdr->type == EFI_DEV_MSG &&
 949                     hdr->sub_type == EFI_DEV_MSG_UART)
 950                         uart = 1;
 951                 else if (hdr->type == EFI_DEV_END_PATH ||
 952                           hdr->type == EFI_DEV_END_PATH2) {
 953                         if (!uart)
 954                                 return 0;
 955                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 956                                 return 1;
 957                         uart = 0;
 958                 }
 959                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 960         }
 961         printk(KERN_ERR "Malformed %s value\n", name);
 962         return 0;
 963 }
 964
 965 /*
 966  * Look for the first granule aligned memory descriptor memory
 967  * that is big enough to hold EFI memory map. Make sure this
 968  * descriptor is atleast granule sized so it does not get trimmed
 969  */
 970 struct kern_memdesc *
 971 find_memmap_space (void)
 972 {
 973         u64     contig_low=0, contig_high=0;
 974         u64     as = 0, ae;
 975         void *efi_map_start, *efi_map_end, *p, *q;
 976         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 977         u64     space_needed, efi_desc_size;
 978         unsigned long total_mem = 0;
 979
 980         efi_map_start = __va(ia64_boot_param->efi_memmap);
 981         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 982         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 983
 984         /*
 985          * Worst case: we need 3 kernel descriptors for each efi descriptor
 986          * (if every entry has a WB part in the middle, and UC head and tail),
 987          * plus one for the end marker.
 988          */
 989         space_needed = sizeof(kern_memdesc_t) *
 990                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 991
 992         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 993                 md = p;
 994                 if (!efi_wb(md)) {
 995                         continue;
 996                 }
 997                 if (pmd == NULL || !efi_wb(pmd) ||
 998                     efi_md_end(pmd) != md->phys_addr) {
 999                         contig_low = GRANULEROUNDUP(md->phys_addr);
1000                         contig_high = efi_md_end(md);
1001                         for (q = p + efi_desc_size; q < efi_map_end;
1002                              q += efi_desc_size) {
1003                                 check_md = q;
1004                                 if (!efi_wb(check_md))
1005                                         break;
1006                                 if (contig_high != check_md->phys_addr)
1007                                         break;
1008                                 contig_high = efi_md_end(check_md);
1009                         }
1010                         contig_high = GRANULEROUNDDOWN(contig_high);
1011                 }
1012                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1013                         continue;
1014
1015                 /* Round ends inward to granule boundaries */
1016                 as = max(contig_low, md->phys_addr);
1017                 ae = min(contig_high, efi_md_end(md));
1018
1019                 /* keep within max_addr= and min_addr= command line arg */
1020                 as = max(as, min_addr);
1021                 ae = min(ae, max_addr);
1022                 if (ae <= as)
1023                         continue;
1024
1025                 /* avoid going over mem= command line arg */
1026                 if (total_mem + (ae - as) > mem_limit)
1027                         ae -= total_mem + (ae - as) - mem_limit;
1028
1029                 if (ae <= as)
1030                         continue;
1031
1032                 if (ae - as > space_needed)
1033                         break;
1034         }
1035         if (p >= efi_map_end)
1036                 panic("Can't allocate space for kernel memory descriptors");
1037
1038         return __va(as);
1039 }
1040
1041 /*
1042  * Walk the EFI memory map and gather all memory available for kernel
1043  * to use.  We can allocate partial granules only if the unavailable
1044  * parts exist, and are WB.
1045  */
1046 unsigned long
1047 efi_memmap_init(u64 *s, u64 *e)
1048 {
1049         struct kern_memdesc *k, *prev = NULL;
1050         u64     contig_low=0, contig_high=0;
1051         u64     as, ae, lim;
1052         void *efi_map_start, *efi_map_end, *p, *q;
1053         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1054         u64     efi_desc_size;
1055         unsigned long total_mem = 0;
1056
1057         k = kern_memmap = find_memmap_space();
1058
1059         efi_map_start = __va(ia64_boot_param->efi_memmap);
1060         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1061         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1062
1063         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1064                 md = p;
1065                 if (!efi_wb(md)) {
1066                         if (efi_uc(md) &&
1067                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1068                              md->type == EFI_BOOT_SERVICES_DATA)) {
1069                                 k->attribute = EFI_MEMORY_UC;
1070                                 k->start = md->phys_addr;
1071                                 k->num_pages = md->num_pages;
1072                                 k++;
1073                         }
1074                         continue;
1075                 }
1076                 if (pmd == NULL || !efi_wb(pmd) ||
1077                     efi_md_end(pmd) != md->phys_addr) {
1078                         contig_low = GRANULEROUNDUP(md->phys_addr);
1079                         contig_high = efi_md_end(md);
1080                         for (q = p + efi_desc_size; q < efi_map_end;
1081                              q += efi_desc_size) {
1082                                 check_md = q;
1083                                 if (!efi_wb(check_md))
1084                                         break;
1085                                 if (contig_high != check_md->phys_addr)
1086                                         break;
1087                                 contig_high = efi_md_end(check_md);
1088                         }
1089                         contig_high = GRANULEROUNDDOWN(contig_high);
1090                 }
1091                 if (!is_memory_available(md))
1092                         continue;
1093
1094 #ifdef CONFIG_CRASH_DUMP
1095                 /* saved_max_pfn should ignore max_addr= command line arg */
1096                 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1097                         saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1098 #endif
1099                 /*
1100                  * Round ends inward to granule boundaries
1101                  * Give trimmings to uncached allocator
1102                  */
1103                 if (md->phys_addr < contig_low) {
1104                         lim = min(efi_md_end(md), contig_low);
1105                         if (efi_uc(md)) {
1106                                 if (k > kern_memmap &&
1107                                     (k-1)->attribute == EFI_MEMORY_UC &&
1108                                     kmd_end(k-1) == md->phys_addr) {
1109                                         (k-1)->num_pages +=
1110                                                 (lim - md->phys_addr)
1111                                                 >> EFI_PAGE_SHIFT;
1112                                 } else {
1113                                         k->attribute = EFI_MEMORY_UC;
1114                                         k->start = md->phys_addr;
1115                                         k->num_pages = (lim - md->phys_addr)
1116                                                 >> EFI_PAGE_SHIFT;
1117                                         k++;
1118                                 }
1119                         }
1120                         as = contig_low;
1121                 } else
1122                         as = md->phys_addr;
1123
1124                 if (efi_md_end(md) > contig_high) {
1125                         lim = max(md->phys_addr, contig_high);
1126                         if (efi_uc(md)) {
1127                                 if (lim == md->phys_addr && k > kern_memmap &&
1128                                     (k-1)->attribute == EFI_MEMORY_UC &&
1129                                     kmd_end(k-1) == md->phys_addr) {
1130                                         (k-1)->num_pages += md->num_pages;
1131                                 } else {
1132                                         k->attribute = EFI_MEMORY_UC;
1133                                         k->start = lim;
1134                                         k->num_pages = (efi_md_end(md) - lim)
1135                                                 >> EFI_PAGE_SHIFT;
1136                                         k++;
1137                                 }
1138                         }
1139                         ae = contig_high;
1140                 } else
1141                         ae = efi_md_end(md);
1142
1143                 /* keep within max_addr= and min_addr= command line arg */
1144                 as = max(as, min_addr);
1145                 ae = min(ae, max_addr);
1146                 if (ae <= as)
1147                         continue;
1148
1149                 /* avoid going over mem= command line arg */
1150                 if (total_mem + (ae - as) > mem_limit)
1151                         ae -= total_mem + (ae - as) - mem_limit;
1152
1153                 if (ae <= as)
1154                         continue;
1155                 if (prev && kmd_end(prev) == md->phys_addr) {
1156                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1157                         total_mem += ae - as;
1158                         continue;
1159                 }
1160                 k->attribute = EFI_MEMORY_WB;
1161                 k->start = as;
1162                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1163                 total_mem += ae - as;
1164                 prev = k++;
1165         }
1166         k->start = ~0L; /* end-marker */
1167
1168         /* reserve the memory we are using for kern_memmap */
1169         *s = (u64)kern_memmap;
1170         *e = (u64)++k;
1171
1172         return total_mem;
1173 }
1174
1175 void
1176 efi_initialize_iomem_resources(struct resource *code_resource,
1177                                struct resource *data_resource,
1178                                struct resource *bss_resource)
1179 {
1180         struct resource *res;
1181         void *efi_map_start, *efi_map_end, *p;
1182         efi_memory_desc_t *md;
1183         u64 efi_desc_size;
1184         char *name;
1185         unsigned long flags;
1186
1187         efi_map_start = __va(ia64_boot_param->efi_memmap);
1188         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1189         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1190
1191         res = NULL;
1192
1193         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1194                 md = p;
1195
1196                 if (md->num_pages == 0) /* should not happen */
1197                         continue;
1198
1199                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1200                 switch (md->type) {
1201
1202                         case EFI_MEMORY_MAPPED_IO:
1203                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1204                                 continue;
1205
1206                         case EFI_LOADER_CODE:
1207                         case EFI_LOADER_DATA:
1208                         case EFI_BOOT_SERVICES_DATA:
1209                         case EFI_BOOT_SERVICES_CODE:
1210                         case EFI_CONVENTIONAL_MEMORY:
1211                                 if (md->attribute & EFI_MEMORY_WP) {
1212                                         name = "System ROM";
1213                                         flags |= IORESOURCE_READONLY;
1214                                 } else if (md->attribute == EFI_MEMORY_UC)
1215                                         name = "Uncached RAM";
1216                                 else
1217                                         name = "System RAM";
1218                                 break;
1219
1220                         case EFI_ACPI_MEMORY_NVS:
1221                                 name = "ACPI Non-volatile Storage";
1222                                 break;
1223
1224                         case EFI_UNUSABLE_MEMORY:
1225                                 name = "reserved";
1226                                 flags |= IORESOURCE_DISABLED;
1227                                 break;
1228
1229                         case EFI_RESERVED_TYPE:
1230                         case EFI_RUNTIME_SERVICES_CODE:
1231                         case EFI_RUNTIME_SERVICES_DATA:
1232                         case EFI_ACPI_RECLAIM_MEMORY:
1233                         default:
1234                                 name = "reserved";
1235                                 break;
1236                 }
1237
1238                 if ((res = kzalloc(sizeof(struct resource),
1239                                    GFP_KERNEL)) == NULL) {
1240                         printk(KERN_ERR
1241                                "failed to allocate resource for iomem\n");
1242                         return;
1243                 }
1244
1245                 res->name = name;
1246                 res->start = md->phys_addr;
1247                 res->end = md->phys_addr + efi_md_size(md) - 1;
1248                 res->flags = flags;
1249
1250                 if (insert_resource(&iomem_resource, res) < 0)
1251                         kfree(res);
1252                 else {
1253                         /*
1254                          * We don't know which region contains
1255                          * kernel data so we try it repeatedly and
1256                          * let the resource manager test it.
1257                          */
1258                         insert_resource(res, code_resource);
1259                         insert_resource(res, data_resource);
1260                         insert_resource(res, bss_resource);
1261 #ifdef CONFIG_KEXEC
1262                         insert_resource(res, &efi_memmap_res);
1263                         insert_resource(res, &boot_param_res);
1264                         if (crashk_res.end > crashk_res.start)
1265                                 insert_resource(res, &crashk_res);
1266 #endif
1267                 }
1268         }
1269 }
1270
1271 #ifdef CONFIG_KEXEC
1272 /* find a block of memory aligned to 64M exclude reserved regions
1273    rsvd_regions are sorted
1274  */
1275 unsigned long __init
1276 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1277 {
1278         int i;
1279         u64 start, end;
1280         u64 alignment = 1UL << _PAGE_SIZE_64M;
1281         void *efi_map_start, *efi_map_end, *p;
1282         efi_memory_desc_t *md;
1283         u64 efi_desc_size;
1284
1285         efi_map_start = __va(ia64_boot_param->efi_memmap);
1286         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1287         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1288
1289         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1290                 md = p;
1291                 if (!efi_wb(md))
1292                         continue;
1293                 start = ALIGN(md->phys_addr, alignment);
1294                 end = efi_md_end(md);
1295                 for (i = 0; i < n; i++) {
1296                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1297                                 if (__pa(r[i].start) > start + size)
1298                                         return start;
1299                                 start = ALIGN(__pa(r[i].end), alignment);
1300                                 if (i < n-1 &&
1301                                     __pa(r[i+1].start) < start + size)
1302                                         continue;
1303                                 else
1304                                         break;
1305                         }
1306                 }
1307                 if (end > start + size)
1308                         return start;
1309         }
1310
1311         printk(KERN_WARNING
1312                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1313         return ~0UL;
1314 }
1315 #endif
1316
1317 #ifdef CONFIG_CRASH_DUMP
1318 /* locate the size find a the descriptor at a certain address */
1319 unsigned long __init
1320 vmcore_find_descriptor_size (unsigned long address)
1321 {
1322         void *efi_map_start, *efi_map_end, *p;
1323         efi_memory_desc_t *md;
1324         u64 efi_desc_size;
1325         unsigned long ret = 0;
1326
1327         efi_map_start = __va(ia64_boot_param->efi_memmap);
1328         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1329         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1330
1331         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1332                 md = p;
1333                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1334                     && md->phys_addr == address) {
1335                         ret = efi_md_size(md);
1336                         break;
1337                 }
1338         }
1339
1340         if (ret == 0)
1341                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1342
1343         return ret;
1344 }
1345 #endif