arch/ia64/kernel/efi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Extensible Firmware Interface
   4  *
   5  * Based on Extensible Firmware Interface Specification version 0.9
   6  * April 30, 1999
   7  *
   8  * Copyright (C) 1999 VA Linux Systems
   9  * Copyright (C) 1999 Walt Drummond <[email protected]>
  10  * Copyright (C) 1999-2003 Hewlett-Packard Co.
  11  *      David Mosberger-Tang <[email protected]>
  12  *      Stephane Eranian <[email protected]>
  13  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  14  *      Bjorn Helgaas <[email protected]>
  15  *
  16  * All EFI Runtime Services are not implemented yet as EFI only
  17  * supports physical mode addressing on SoftSDV. This is to be fixed
  18  * in a future version.  --drummond 1999-07-20
  19  *
  20  * Implemented EFI runtime services and virtual mode calls.  --davidm
  21  *
  22  * Goutham Rao: <[email protected]>
  23  *      Skip non-WB memory and ignore empty memory ranges.
  24  */
  25 #include <linux/module.h>
  26 #include <linux/memblock.h>
  27 #include <linux/crash_dump.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/slab.h>
  32 #include <linux/time.h>
  33 #include <linux/efi.h>
  34 #include <linux/kexec.h>
  35 #include <linux/mm.h>
  36
  37 #include <asm/efi.h>
  38 #include <asm/io.h>
  39 #include <asm/kregs.h>
  40 #include <asm/meminit.h>
  41 #include <asm/processor.h>
  42 #include <asm/mca.h>
  43 #include <asm/sal.h>
  44 #include <asm/setup.h>
  45 #include <asm/tlbflush.h>
  46
  47 #define EFI_DEBUG       0
  48
  49 #define ESI_TABLE_GUID                                  \
  50     EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3,          \
  51              0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
  52
  53 static unsigned long mps_phys = EFI_INVALID_TABLE_ADDR;
  54 static __initdata unsigned long palo_phys;
  55
  56 unsigned long __initdata esi_phys = EFI_INVALID_TABLE_ADDR;
  57 unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
  58 unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
  59
  60 static const efi_config_table_type_t arch_tables[] __initconst = {
  61         {ESI_TABLE_GUID,                                &esi_phys,              "ESI"           },
  62         {HCDP_TABLE_GUID,                               &hcdp_phys,             "HCDP"          },
  63         {MPS_TABLE_GUID,                                &mps_phys,              "MPS"           },
  64         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID,    &palo_phys,             "PALO"          },
  65         {SAL_SYSTEM_TABLE_GUID,                         &sal_systab_phys,       "SALsystab"     },
  66         {},
  67 };
  68
  69 extern efi_status_t efi_call_phys (void *, ...);
  70
  71 static efi_runtime_services_t *runtime;
  72 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  73
  74 #define efi_call_virt(f, args...)       (*(f))(args)
  75
  76 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  77 static efi_status_t                                                            \
  78 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  79 {                                                                              \
  80         struct ia64_fpreg fr[6];                                               \
  81         efi_time_cap_t *atc = NULL;                                            \
  82         efi_status_t ret;                                                      \
  83                                                                                \
  84         if (tc)                                                                \
  85                 atc = adjust_arg(tc);                                          \
  86         ia64_save_scratch_fpregs(fr);                                          \
  87         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  88                                 adjust_arg(tm), atc);                          \
  89         ia64_load_scratch_fpregs(fr);                                          \
  90         return ret;                                                            \
  91 }
  92
  93 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  94 static efi_status_t                                                            \
  95 prefix##_set_time (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((efi_set_time_t *) __va(runtime->set_time),    \
 102                                 adjust_arg(tm));                               \
 103         ia64_load_scratch_fpregs(fr);                                          \
 104         return ret;                                                            \
 105 }
 106
 107 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
 108 static efi_status_t                                                            \
 109 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
 110                           efi_time_t *tm)                                      \
 111 {                                                                              \
 112         struct ia64_fpreg fr[6];                                               \
 113         efi_status_t ret;                                                      \
 114                                                                                \
 115         ia64_save_scratch_fpregs(fr);                                          \
 116         ret = efi_call_##prefix(                                               \
 117                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
 118                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
 119         ia64_load_scratch_fpregs(fr);                                          \
 120         return ret;                                                            \
 121 }
 122
 123 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 124 static efi_status_t                                                            \
 125 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 126 {                                                                              \
 127         struct ia64_fpreg fr[6];                                               \
 128         efi_time_t *atm = NULL;                                                \
 129         efi_status_t ret;                                                      \
 130                                                                                \
 131         if (tm)                                                                \
 132                 atm = adjust_arg(tm);                                          \
 133         ia64_save_scratch_fpregs(fr);                                          \
 134         ret = efi_call_##prefix(                                               \
 135                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 136                 enabled, atm);                                                 \
 137         ia64_load_scratch_fpregs(fr);                                          \
 138         return ret;                                                            \
 139 }
 140
 141 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 142 static efi_status_t                                                            \
 143 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 144                        unsigned long *data_size, void *data)                   \
 145 {                                                                              \
 146         struct ia64_fpreg fr[6];                                               \
 147         u32 *aattr = NULL;                                                     \
 148         efi_status_t ret;                                                      \
 149                                                                                \
 150         if (attr)                                                              \
 151                 aattr = adjust_arg(attr);                                      \
 152         ia64_save_scratch_fpregs(fr);                                          \
 153         ret = efi_call_##prefix(                                               \
 154                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 155                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 156                 adjust_arg(data_size), adjust_arg(data));                      \
 157         ia64_load_scratch_fpregs(fr);                                          \
 158         return ret;                                                            \
 159 }
 160
 161 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 162 static efi_status_t                                                            \
 163 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 164                             efi_guid_t *vendor)                                \
 165 {                                                                              \
 166         struct ia64_fpreg fr[6];                                               \
 167         efi_status_t ret;                                                      \
 168                                                                                \
 169         ia64_save_scratch_fpregs(fr);                                          \
 170         ret = efi_call_##prefix(                                               \
 171                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 172                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 173         ia64_load_scratch_fpregs(fr);                                          \
 174         return ret;                                                            \
 175 }
 176
 177 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 178 static efi_status_t                                                            \
 179 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 180                        u32 attr, unsigned long data_size,                      \
 181                        void *data)                                             \
 182 {                                                                              \
 183         struct ia64_fpreg fr[6];                                               \
 184         efi_status_t ret;                                                      \
 185                                                                                \
 186         ia64_save_scratch_fpregs(fr);                                          \
 187         ret = efi_call_##prefix(                                               \
 188                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 189                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 190                 adjust_arg(data));                                             \
 191         ia64_load_scratch_fpregs(fr);                                          \
 192         return ret;                                                            \
 193 }
 194
 195 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 196 static efi_status_t                                                            \
 197 prefix##_get_next_high_mono_count (u32 *count)                                 \
 198 {                                                                              \
 199         struct ia64_fpreg fr[6];                                               \
 200         efi_status_t ret;                                                      \
 201                                                                                \
 202         ia64_save_scratch_fpregs(fr);                                          \
 203         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 204                                 __va(runtime->get_next_high_mono_count),       \
 205                                 adjust_arg(count));                            \
 206         ia64_load_scratch_fpregs(fr);                                          \
 207         return ret;                                                            \
 208 }
 209
 210 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 211 static void                                                                    \
 212 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 213                        unsigned long data_size, efi_char16_t *data)            \
 214 {                                                                              \
 215         struct ia64_fpreg fr[6];                                               \
 216         efi_char16_t *adata = NULL;                                            \
 217                                                                                \
 218         if (data)                                                              \
 219                 adata = adjust_arg(data);                                      \
 220                                                                                \
 221         ia64_save_scratch_fpregs(fr);                                          \
 222         efi_call_##prefix(                                                     \
 223                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 224                 reset_type, status, data_size, adata);                         \
 225         /* should not return, but just in case... */                           \
 226         ia64_load_scratch_fpregs(fr);                                          \
 227 }
 228
 229 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 230
 231 STUB_GET_TIME(phys, phys_ptr)
 232 STUB_SET_TIME(phys, phys_ptr)
 233 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 234 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 235 STUB_GET_VARIABLE(phys, phys_ptr)
 236 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 237 STUB_SET_VARIABLE(phys, phys_ptr)
 238 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 239 STUB_RESET_SYSTEM(phys, phys_ptr)
 240
 241 #define id(arg) arg
 242
 243 STUB_GET_TIME(virt, id)
 244 STUB_SET_TIME(virt, id)
 245 STUB_GET_WAKEUP_TIME(virt, id)
 246 STUB_SET_WAKEUP_TIME(virt, id)
 247 STUB_GET_VARIABLE(virt, id)
 248 STUB_GET_NEXT_VARIABLE(virt, id)
 249 STUB_SET_VARIABLE(virt, id)
 250 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 251 STUB_RESET_SYSTEM(virt, id)
 252
 253 void
 254 efi_gettimeofday (struct timespec64 *ts)
 255 {
 256         efi_time_t tm;
 257
 258         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 259                 memset(ts, 0, sizeof(*ts));
 260                 return;
 261         }
 262
 263         ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
 264                             tm.hour, tm.minute, tm.second);
 265         ts->tv_nsec = tm.nanosecond;
 266 }
 267
 268 static int
 269 is_memory_available (efi_memory_desc_t *md)
 270 {
 271         if (!(md->attribute & EFI_MEMORY_WB))
 272                 return 0;
 273
 274         switch (md->type) {
 275               case EFI_LOADER_CODE:
 276               case EFI_LOADER_DATA:
 277               case EFI_BOOT_SERVICES_CODE:
 278               case EFI_BOOT_SERVICES_DATA:
 279               case EFI_CONVENTIONAL_MEMORY:
 280                 return 1;
 281         }
 282         return 0;
 283 }
 284
 285 typedef struct kern_memdesc {
 286         u64 attribute;
 287         u64 start;
 288         u64 num_pages;
 289 } kern_memdesc_t;
 290
 291 static kern_memdesc_t *kern_memmap;
 292
 293 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 294
 295 static inline u64
 296 kmd_end(kern_memdesc_t *kmd)
 297 {
 298         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 299 }
 300
 301 static inline u64
 302 efi_md_end(efi_memory_desc_t *md)
 303 {
 304         return (md->phys_addr + efi_md_size(md));
 305 }
 306
 307 static inline int
 308 efi_wb(efi_memory_desc_t *md)
 309 {
 310         return (md->attribute & EFI_MEMORY_WB);
 311 }
 312
 313 static inline int
 314 efi_uc(efi_memory_desc_t *md)
 315 {
 316         return (md->attribute & EFI_MEMORY_UC);
 317 }
 318
 319 static void
 320 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 321 {
 322         kern_memdesc_t *k;
 323         u64 start, end, voff;
 324
 325         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 326         for (k = kern_memmap; k->start != ~0UL; k++) {
 327                 if (k->attribute != attr)
 328                         continue;
 329                 start = PAGE_ALIGN(k->start);
 330                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 331                 if (start < end)
 332                         if ((*callback)(start + voff, end + voff, arg) < 0)
 333                                 return;
 334         }
 335 }
 336
 337 /*
 338  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 339  * descriptor that has memory that is available for OS use.
 340  */
 341 void
 342 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 343 {
 344         walk(callback, arg, EFI_MEMORY_WB);
 345 }
 346
 347 /*
 348  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 349  * descriptor that has memory that is available for uncached allocator.
 350  */
 351 void
 352 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 353 {
 354         walk(callback, arg, EFI_MEMORY_UC);
 355 }
 356
 357 /*
 358  * Look for the PAL_CODE region reported by EFI and map it using an
 359  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 360  * Abstraction Layer chapter 11 in ADAG
 361  */
 362 void *
 363 efi_get_pal_addr (void)
 364 {
 365         void *efi_map_start, *efi_map_end, *p;
 366         efi_memory_desc_t *md;
 367         u64 efi_desc_size;
 368         int pal_code_count = 0;
 369         u64 vaddr, mask;
 370
 371         efi_map_start = __va(ia64_boot_param->efi_memmap);
 372         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 373         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 374
 375         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 376                 md = p;
 377                 if (md->type != EFI_PAL_CODE)
 378                         continue;
 379
 380                 if (++pal_code_count > 1) {
 381                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 382                                "dropped @ %llx\n", md->phys_addr);
 383                         continue;
 384                 }
 385                 /*
 386                  * The only ITLB entry in region 7 that is used is the one
 387                  * installed by __start().  That entry covers a 64MB range.
 388                  */
 389                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 390                 vaddr = PAGE_OFFSET + md->phys_addr;
 391
 392                 /*
 393                  * We must check that the PAL mapping won't overlap with the
 394                  * kernel mapping.
 395                  *
 396                  * PAL code is guaranteed to be aligned on a power of 2 between
 397                  * 4k and 256KB and that only one ITR is needed to map it. This
 398                  * implies that the PAL code is always aligned on its size,
 399                  * i.e., the closest matching page size supported by the TLB.
 400                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 401                  * it is bigger than 64MB (very unlikely!).  So for now the
 402                  * following test is enough to determine whether or not we need
 403                  * a dedicated ITR for the PAL code.
 404                  */
 405                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 406                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 407                                __func__);
 408                         continue;
 409                 }
 410
 411                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 412                         panic("Whoa!  PAL code size bigger than a granule!");
 413
 414 #if EFI_DEBUG
 415                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 416
 417                 printk(KERN_INFO "CPU %d: mapping PAL code "
 418                         "[0x%llx-0x%llx) into [0x%llx-0x%llx)\n",
 419                         smp_processor_id(), md->phys_addr,
 420                         md->phys_addr + efi_md_size(md),
 421                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 422 #endif
 423                 return __va(md->phys_addr);
 424         }
 425         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 426                __func__);
 427         return NULL;
 428 }
 429
 430
 431 static u8 __init palo_checksum(u8 *buffer, u32 length)
 432 {
 433         u8 sum = 0;
 434         u8 *end = buffer + length;
 435
 436         while (buffer < end)
 437                 sum = (u8) (sum + *(buffer++));
 438
 439         return sum;
 440 }
 441
 442 /*
 443  * Parse and handle PALO table which is published at:
 444  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 445  */
 446 static void __init handle_palo(unsigned long phys_addr)
 447 {
 448         struct palo_table *palo = __va(phys_addr);
 449         u8  checksum;
 450
 451         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 452                 printk(KERN_INFO "PALO signature incorrect.\n");
 453                 return;
 454         }
 455
 456         checksum = palo_checksum((u8 *)palo, palo->length);
 457         if (checksum) {
 458                 printk(KERN_INFO "PALO checksum incorrect.\n");
 459                 return;
 460         }
 461
 462         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 463 }
 464
 465 void
 466 efi_map_pal_code (void)
 467 {
 468         void *pal_vaddr = efi_get_pal_addr ();
 469         u64 psr;
 470
 471         if (!pal_vaddr)
 472                 return;
 473
 474         /*
 475          * Cannot write to CRx with PSR.ic=1
 476          */
 477         psr = ia64_clear_ic();
 478         ia64_itr(0x1, IA64_TR_PALCODE,
 479                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 480                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 481                  IA64_GRANULE_SHIFT);
 482         ia64_set_psr(psr);              /* restore psr */
 483 }
 484
 485 void __init
 486 efi_init (void)
 487 {
 488         const efi_system_table_t *efi_systab;
 489         void *efi_map_start, *efi_map_end;
 490         u64 efi_desc_size;
 491         char *cp;
 492
 493         set_bit(EFI_BOOT, &efi.flags);
 494         set_bit(EFI_64BIT, &efi.flags);
 495
 496         /*
 497          * It's too early to be able to use the standard kernel command line
 498          * support...
 499          */
 500         for (cp = boot_command_line; *cp; ) {
 501                 if (memcmp(cp, "mem=", 4) == 0) {
 502                         mem_limit = memparse(cp + 4, &cp);
 503                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 504                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 505                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 506                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 507                 } else {
 508                         while (*cp != ' ' && *cp)
 509                                 ++cp;
 510                         while (*cp == ' ')
 511                                 ++cp;
 512                 }
 513         }
 514         if (min_addr != 0UL)
 515                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 516                        min_addr >> 20);
 517         if (max_addr != ~0UL)
 518                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 519                        max_addr >> 20);
 520
 521         efi_systab = __va(ia64_boot_param->efi_systab);
 522
 523         /*
 524          * Verify the EFI Table
 525          */
 526         if (efi_systab == NULL)
 527                 panic("Whoa! Can't find EFI system table.\n");
 528         if (efi_systab_check_header(&efi_systab->hdr, 1))
 529                 panic("Whoa! EFI system table signature incorrect\n");
 530
 531         efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
 532
 533         palo_phys      = EFI_INVALID_TABLE_ADDR;
 534
 535         if (efi_config_parse_tables(__va(efi_systab->tables),
 536                                     efi_systab->nr_tables,
 537                                     arch_tables) != 0)
 538                 return;
 539
 540         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 541                 handle_palo(palo_phys);
 542
 543         runtime = __va(efi_systab->runtime);
 544         efi.get_time = phys_get_time;
 545         efi.set_time = phys_set_time;
 546         efi.get_wakeup_time = phys_get_wakeup_time;
 547         efi.set_wakeup_time = phys_set_wakeup_time;
 548         efi.get_variable = phys_get_variable;
 549         efi.get_next_variable = phys_get_next_variable;
 550         efi.set_variable = phys_set_variable;
 551         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 552         efi.reset_system = phys_reset_system;
 553
 554         efi_map_start = __va(ia64_boot_param->efi_memmap);
 555         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 556         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 557
 558 #if EFI_DEBUG
 559         /* print EFI memory map: */
 560         {
 561                 efi_memory_desc_t *md;
 562                 void *p;
 563                 unsigned int i;
 564
 565                 for (i = 0, p = efi_map_start; p < efi_map_end;
 566                      ++i, p += efi_desc_size)
 567                 {
 568                         const char *unit;
 569                         unsigned long size;
 570                         char buf[64];
 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: %s "
 590                                "range=[0x%016llx-0x%016llx) (%4lu%s)\n",
 591                                i, efi_md_typeattr_format(buf, sizeof(buf), md),
 592                                md->phys_addr,
 593                                md->phys_addr + efi_md_size(md), size, unit);
 594                 }
 595         }
 596 #endif
 597
 598         efi_map_pal_code();
 599         efi_enter_virtual_mode();
 600 }
 601
 602 void
 603 efi_enter_virtual_mode (void)
 604 {
 605         void *efi_map_start, *efi_map_end, *p;
 606         efi_memory_desc_t *md;
 607         efi_status_t status;
 608         u64 efi_desc_size;
 609
 610         efi_map_start = __va(ia64_boot_param->efi_memmap);
 611         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 612         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 613
 614         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 615                 md = p;
 616                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 617                         /*
 618                          * Some descriptors have multiple bits set, so the
 619                          * order of the tests is relevant.
 620                          */
 621                         if (md->attribute & EFI_MEMORY_WB) {
 622                                 md->virt_addr = (u64) __va(md->phys_addr);
 623                         } else if (md->attribute & EFI_MEMORY_UC) {
 624                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 625                         } else if (md->attribute & EFI_MEMORY_WC) {
 626 #if 0
 627                                 md->virt_addr = ia64_remap(md->phys_addr,
 628                                                            (_PAGE_A |
 629                                                             _PAGE_P |
 630                                                             _PAGE_D |
 631                                                             _PAGE_MA_WC |
 632                                                             _PAGE_PL_0 |
 633                                                             _PAGE_AR_RW));
 634 #else
 635                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 636                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 637 #endif
 638                         } else if (md->attribute & EFI_MEMORY_WT) {
 639 #if 0
 640                                 md->virt_addr = ia64_remap(md->phys_addr,
 641                                                            (_PAGE_A |
 642                                                             _PAGE_P |
 643                                                             _PAGE_D |
 644                                                             _PAGE_MA_WT |
 645                                                             _PAGE_PL_0 |
 646                                                             _PAGE_AR_RW));
 647 #else
 648                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 649                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 650 #endif
 651                         }
 652                 }
 653         }
 654
 655         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 656                                ia64_boot_param->efi_memmap_size,
 657                                efi_desc_size,
 658                                ia64_boot_param->efi_memdesc_version,
 659                                ia64_boot_param->efi_memmap);
 660         if (status != EFI_SUCCESS) {
 661                 printk(KERN_WARNING "warning: unable to switch EFI into "
 662                        "virtual mode (status=%lu)\n", status);
 663                 return;
 664         }
 665
 666         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 667
 668         /*
 669          * Now that EFI is in virtual mode, we call the EFI functions more
 670          * efficiently:
 671          */
 672         efi.get_time = virt_get_time;
 673         efi.set_time = virt_set_time;
 674         efi.get_wakeup_time = virt_get_wakeup_time;
 675         efi.set_wakeup_time = virt_set_wakeup_time;
 676         efi.get_variable = virt_get_variable;
 677         efi.get_next_variable = virt_get_next_variable;
 678         efi.set_variable = virt_set_variable;
 679         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 680         efi.reset_system = virt_reset_system;
 681 }
 682
 683 /*
 684  * Walk the EFI memory map looking for the I/O port range.  There can only be
 685  * one entry of this type, other I/O port ranges should be described via ACPI.
 686  */
 687 u64
 688 efi_get_iobase (void)
 689 {
 690         void *efi_map_start, *efi_map_end, *p;
 691         efi_memory_desc_t *md;
 692         u64 efi_desc_size;
 693
 694         efi_map_start = __va(ia64_boot_param->efi_memmap);
 695         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 696         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 697
 698         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 699                 md = p;
 700                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 701                         if (md->attribute & EFI_MEMORY_UC)
 702                                 return md->phys_addr;
 703                 }
 704         }
 705         return 0;
 706 }
 707
 708 static struct kern_memdesc *
 709 kern_memory_descriptor (unsigned long phys_addr)
 710 {
 711         struct kern_memdesc *md;
 712
 713         for (md = kern_memmap; md->start != ~0UL; md++) {
 714                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 715                          return md;
 716         }
 717         return NULL;
 718 }
 719
 720 static efi_memory_desc_t *
 721 efi_memory_descriptor (unsigned long phys_addr)
 722 {
 723         void *efi_map_start, *efi_map_end, *p;
 724         efi_memory_desc_t *md;
 725         u64 efi_desc_size;
 726
 727         efi_map_start = __va(ia64_boot_param->efi_memmap);
 728         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 729         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 730
 731         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 732                 md = p;
 733
 734                 if (phys_addr - md->phys_addr < efi_md_size(md))
 735                          return md;
 736         }
 737         return NULL;
 738 }
 739
 740 static int
 741 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 742 {
 743         void *efi_map_start, *efi_map_end, *p;
 744         efi_memory_desc_t *md;
 745         u64 efi_desc_size;
 746         unsigned long end;
 747
 748         efi_map_start = __va(ia64_boot_param->efi_memmap);
 749         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 750         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 751
 752         end = phys_addr + size;
 753
 754         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 755                 md = p;
 756                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 757                         return 1;
 758         }
 759         return 0;
 760 }
 761
 762 int
 763 efi_mem_type (unsigned long phys_addr)
 764 {
 765         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 766
 767         if (md)
 768                 return md->type;
 769         return -EINVAL;
 770 }
 771
 772 u64
 773 efi_mem_attributes (unsigned long phys_addr)
 774 {
 775         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 776
 777         if (md)
 778                 return md->attribute;
 779         return 0;
 780 }
 781 EXPORT_SYMBOL(efi_mem_attributes);
 782
 783 u64
 784 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 785 {
 786         unsigned long end = phys_addr + size;
 787         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 788         u64 attr;
 789
 790         if (!md)
 791                 return 0;
 792
 793         /*
 794          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 795          * the kernel that firmware needs this region mapped.
 796          */
 797         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 798         do {
 799                 unsigned long md_end = efi_md_end(md);
 800
 801                 if (end <= md_end)
 802                         return attr;
 803
 804                 md = efi_memory_descriptor(md_end);
 805                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 806                         return 0;
 807         } while (md);
 808         return 0;       /* never reached */
 809 }
 810
 811 u64
 812 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 813 {
 814         unsigned long end = phys_addr + size;
 815         struct kern_memdesc *md;
 816         u64 attr;
 817
 818         /*
 819          * This is a hack for ioremap calls before we set up kern_memmap.
 820          * Maybe we should do efi_memmap_init() earlier instead.
 821          */
 822         if (!kern_memmap) {
 823                 attr = efi_mem_attribute(phys_addr, size);
 824                 if (attr & EFI_MEMORY_WB)
 825                         return EFI_MEMORY_WB;
 826                 return 0;
 827         }
 828
 829         md = kern_memory_descriptor(phys_addr);
 830         if (!md)
 831                 return 0;
 832
 833         attr = md->attribute;
 834         do {
 835                 unsigned long md_end = kmd_end(md);
 836
 837                 if (end <= md_end)
 838                         return attr;
 839
 840                 md = kern_memory_descriptor(md_end);
 841                 if (!md || md->attribute != attr)
 842                         return 0;
 843         } while (md);
 844         return 0;       /* never reached */
 845 }
 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.rst.
 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 at least 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                 /*
1095                  * Round ends inward to granule boundaries
1096                  * Give trimmings to uncached allocator
1097                  */
1098                 if (md->phys_addr < contig_low) {
1099                         lim = min(efi_md_end(md), contig_low);
1100                         if (efi_uc(md)) {
1101                                 if (k > kern_memmap &&
1102                                     (k-1)->attribute == EFI_MEMORY_UC &&
1103                                     kmd_end(k-1) == md->phys_addr) {
1104                                         (k-1)->num_pages +=
1105                                                 (lim - md->phys_addr)
1106                                                 >> EFI_PAGE_SHIFT;
1107                                 } else {
1108                                         k->attribute = EFI_MEMORY_UC;
1109                                         k->start = md->phys_addr;
1110                                         k->num_pages = (lim - md->phys_addr)
1111                                                 >> EFI_PAGE_SHIFT;
1112                                         k++;
1113                                 }
1114                         }
1115                         as = contig_low;
1116                 } else
1117                         as = md->phys_addr;
1118
1119                 if (efi_md_end(md) > contig_high) {
1120                         lim = max(md->phys_addr, contig_high);
1121                         if (efi_uc(md)) {
1122                                 if (lim == md->phys_addr && k > kern_memmap &&
1123                                     (k-1)->attribute == EFI_MEMORY_UC &&
1124                                     kmd_end(k-1) == md->phys_addr) {
1125                                         (k-1)->num_pages += md->num_pages;
1126                                 } else {
1127                                         k->attribute = EFI_MEMORY_UC;
1128                                         k->start = lim;
1129                                         k->num_pages = (efi_md_end(md) - lim)
1130                                                 >> EFI_PAGE_SHIFT;
1131                                         k++;
1132                                 }
1133                         }
1134                         ae = contig_high;
1135                 } else
1136                         ae = efi_md_end(md);
1137
1138                 /* keep within max_addr= and min_addr= command line arg */
1139                 as = max(as, min_addr);
1140                 ae = min(ae, max_addr);
1141                 if (ae <= as)
1142                         continue;
1143
1144                 /* avoid going over mem= command line arg */
1145                 if (total_mem + (ae - as) > mem_limit)
1146                         ae -= total_mem + (ae - as) - mem_limit;
1147
1148                 if (ae <= as)
1149                         continue;
1150                 if (prev && kmd_end(prev) == md->phys_addr) {
1151                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1152                         total_mem += ae - as;
1153                         continue;
1154                 }
1155                 k->attribute = EFI_MEMORY_WB;
1156                 k->start = as;
1157                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1158                 total_mem += ae - as;
1159                 prev = k++;
1160         }
1161         k->start = ~0L; /* end-marker */
1162
1163         /* reserve the memory we are using for kern_memmap */
1164         *s = (u64)kern_memmap;
1165         *e = (u64)++k;
1166
1167         return total_mem;
1168 }
1169
1170 void
1171 efi_initialize_iomem_resources(struct resource *code_resource,
1172                                struct resource *data_resource,
1173                                struct resource *bss_resource)
1174 {
1175         struct resource *res;
1176         void *efi_map_start, *efi_map_end, *p;
1177         efi_memory_desc_t *md;
1178         u64 efi_desc_size;
1179         char *name;
1180         unsigned long flags, desc;
1181
1182         efi_map_start = __va(ia64_boot_param->efi_memmap);
1183         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1184         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1185
1186         res = NULL;
1187
1188         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1189                 md = p;
1190
1191                 if (md->num_pages == 0) /* should not happen */
1192                         continue;
1193
1194                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1195                 desc = IORES_DESC_NONE;
1196
1197                 switch (md->type) {
1198
1199                         case EFI_MEMORY_MAPPED_IO:
1200                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1201                                 continue;
1202
1203                         case EFI_LOADER_CODE:
1204                         case EFI_LOADER_DATA:
1205                         case EFI_BOOT_SERVICES_DATA:
1206                         case EFI_BOOT_SERVICES_CODE:
1207                         case EFI_CONVENTIONAL_MEMORY:
1208                                 if (md->attribute & EFI_MEMORY_WP) {
1209                                         name = "System ROM";
1210                                         flags |= IORESOURCE_READONLY;
1211                                 } else if (md->attribute == EFI_MEMORY_UC) {
1212                                         name = "Uncached RAM";
1213                                 } else {
1214                                         name = "System RAM";
1215                                         flags |= IORESOURCE_SYSRAM;
1216                                 }
1217                                 break;
1218
1219                         case EFI_ACPI_MEMORY_NVS:
1220                                 name = "ACPI Non-volatile Storage";
1221                                 desc = IORES_DESC_ACPI_NV_STORAGE;
1222                                 break;
1223
1224                         case EFI_UNUSABLE_MEMORY:
1225                                 name = "reserved";
1226                                 flags |= IORESOURCE_DISABLED;
1227                                 break;
1228
1229                         case EFI_PERSISTENT_MEMORY:
1230                                 name = "Persistent Memory";
1231                                 desc = IORES_DESC_PERSISTENT_MEMORY;
1232                                 break;
1233
1234                         case EFI_RESERVED_TYPE:
1235                         case EFI_RUNTIME_SERVICES_CODE:
1236                         case EFI_RUNTIME_SERVICES_DATA:
1237                         case EFI_ACPI_RECLAIM_MEMORY:
1238                         default:
1239                                 name = "reserved";
1240                                 break;
1241                 }
1242
1243                 if ((res = kzalloc(sizeof(struct resource),
1244                                    GFP_KERNEL)) == NULL) {
1245                         printk(KERN_ERR
1246                                "failed to allocate resource for iomem\n");
1247                         return;
1248                 }
1249
1250                 res->name = name;
1251                 res->start = md->phys_addr;
1252                 res->end = md->phys_addr + efi_md_size(md) - 1;
1253                 res->flags = flags;
1254                 res->desc = desc;
1255
1256                 if (insert_resource(&iomem_resource, res) < 0)
1257                         kfree(res);
1258                 else {
1259                         /*
1260                          * We don't know which region contains
1261                          * kernel data so we try it repeatedly and
1262                          * let the resource manager test it.
1263                          */
1264                         insert_resource(res, code_resource);
1265                         insert_resource(res, data_resource);
1266                         insert_resource(res, bss_resource);
1267 #ifdef CONFIG_KEXEC
1268                         insert_resource(res, &efi_memmap_res);
1269                         insert_resource(res, &boot_param_res);
1270                         if (crashk_res.end > crashk_res.start)
1271                                 insert_resource(res, &crashk_res);
1272 #endif
1273                 }
1274         }
1275 }
1276
1277 #ifdef CONFIG_KEXEC
1278 /* find a block of memory aligned to 64M exclude reserved regions
1279    rsvd_regions are sorted
1280  */
1281 unsigned long __init
1282 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1283 {
1284         int i;
1285         u64 start, end;
1286         u64 alignment = 1UL << _PAGE_SIZE_64M;
1287         void *efi_map_start, *efi_map_end, *p;
1288         efi_memory_desc_t *md;
1289         u64 efi_desc_size;
1290
1291         efi_map_start = __va(ia64_boot_param->efi_memmap);
1292         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1293         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1294
1295         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1296                 md = p;
1297                 if (!efi_wb(md))
1298                         continue;
1299                 start = ALIGN(md->phys_addr, alignment);
1300                 end = efi_md_end(md);
1301                 for (i = 0; i < n; i++) {
1302                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1303                                 if (__pa(r[i].start) > start + size)
1304                                         return start;
1305                                 start = ALIGN(__pa(r[i].end), alignment);
1306                                 if (i < n-1 &&
1307                                     __pa(r[i+1].start) < start + size)
1308                                         continue;
1309                                 else
1310                                         break;
1311                         }
1312                 }
1313                 if (end > start + size)
1314                         return start;
1315         }
1316
1317         printk(KERN_WARNING
1318                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1319         return ~0UL;
1320 }
1321 #endif
1322
1323 #ifdef CONFIG_CRASH_DUMP
1324 /* locate the size find a the descriptor at a certain address */
1325 unsigned long __init
1326 vmcore_find_descriptor_size (unsigned long address)
1327 {
1328         void *efi_map_start, *efi_map_end, *p;
1329         efi_memory_desc_t *md;
1330         u64 efi_desc_size;
1331         unsigned long ret = 0;
1332
1333         efi_map_start = __va(ia64_boot_param->efi_memmap);
1334         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1335         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1336
1337         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1338                 md = p;
1339                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1340                     && md->phys_addr == address) {
1341                         ret = efi_md_size(md);
1342                         break;
1343                 }
1344         }
1345
1346         if (ret == 0)
1347                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1348
1349         return ret;
1350 }
1351 #endif
1352
1353 char *efi_systab_show_arch(char *str)
1354 {
1355         if (mps_phys != EFI_INVALID_TABLE_ADDR)
1356                 str += sprintf(str, "MPS=0x%lx\n", mps_phys);
1357         if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
1358                 str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);
1359         return str;
1360 }