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 <drummond@valinux.com>
  10  * Copyright (C) 1999-2003 Hewlett-Packard Co.
  11  *      David Mosberger-Tang <davidm@hpl.hp.com>
  12  *      Stephane Eranian <eranian@hpl.hp.com>
  13  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  14  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  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: <goutham.rao@intel.com>
  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/io.h>
  38 #include <asm/kregs.h>
  39 #include <asm/meminit.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 #define ESI_TABLE_GUID                                  \
  48     EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3,          \
  49              0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
  50
  51 static unsigned long mps_phys = EFI_INVALID_TABLE_ADDR;
  52 static __initdata unsigned long palo_phys;
  53
  54 unsigned long __initdata esi_phys = EFI_INVALID_TABLE_ADDR;
  55 unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
  56 unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
  57
  58 static const efi_config_table_type_t arch_tables[] __initconst = {
  59         {ESI_TABLE_GUID,                                &esi_phys,              "ESI"           },
  60         {HCDP_TABLE_GUID,                               &hcdp_phys,             "HCDP"          },
  61         {MPS_TABLE_GUID,                                &mps_phys,              "MPS"           },
  62         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID,    &palo_phys,             "PALO"          },
  63         {SAL_SYSTEM_TABLE_GUID,                         &sal_systab_phys,       "SALsystab"     },
  64         {},
  65 };
  66
  67 extern efi_status_t efi_call_phys (void *, ...);
  68
  69 static efi_runtime_services_t *runtime;
  70 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  71
  72 #define efi_call_virt(f, args...)       (*(f))(args)
  73
  74 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  75 static efi_status_t                                                            \
  76 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  77 {                                                                              \
  78         struct ia64_fpreg fr[6];                                               \
  79         efi_time_cap_t *atc = NULL;                                            \
  80         efi_status_t ret;                                                      \
  81                                                                                \
  82         if (tc)                                                                \
  83                 atc = adjust_arg(tc);                                          \
  84         ia64_save_scratch_fpregs(fr);                                          \
  85         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  86                                 adjust_arg(tm), atc);                          \
  87         ia64_load_scratch_fpregs(fr);                                          \
  88         return ret;                                                            \
  89 }
  90
  91 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  92 static efi_status_t                                                            \
  93 prefix##_set_time (efi_time_t *tm)                                             \
  94 {                                                                              \
  95         struct ia64_fpreg fr[6];                                               \
  96         efi_status_t ret;                                                      \
  97                                                                                \
  98         ia64_save_scratch_fpregs(fr);                                          \
  99         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
 100                                 adjust_arg(tm));                               \
 101         ia64_load_scratch_fpregs(fr);                                          \
 102         return ret;                                                            \
 103 }
 104
 105 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
 106 static efi_status_t                                                            \
 107 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
 108                           efi_time_t *tm)                                      \
 109 {                                                                              \
 110         struct ia64_fpreg fr[6];                                               \
 111         efi_status_t ret;                                                      \
 112                                                                                \
 113         ia64_save_scratch_fpregs(fr);                                          \
 114         ret = efi_call_##prefix(                                               \
 115                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
 116                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
 117         ia64_load_scratch_fpregs(fr);                                          \
 118         return ret;                                                            \
 119 }
 120
 121 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 122 static efi_status_t                                                            \
 123 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 124 {                                                                              \
 125         struct ia64_fpreg fr[6];                                               \
 126         efi_time_t *atm = NULL;                                                \
 127         efi_status_t ret;                                                      \
 128                                                                                \
 129         if (tm)                                                                \
 130                 atm = adjust_arg(tm);                                          \
 131         ia64_save_scratch_fpregs(fr);                                          \
 132         ret = efi_call_##prefix(                                               \
 133                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 134                 enabled, atm);                                                 \
 135         ia64_load_scratch_fpregs(fr);                                          \
 136         return ret;                                                            \
 137 }
 138
 139 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 140 static efi_status_t                                                            \
 141 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 142                        unsigned long *data_size, void *data)                   \
 143 {                                                                              \
 144         struct ia64_fpreg fr[6];                                               \
 145         u32 *aattr = NULL;                                                     \
 146         efi_status_t ret;                                                      \
 147                                                                                \
 148         if (attr)                                                              \
 149                 aattr = adjust_arg(attr);                                      \
 150         ia64_save_scratch_fpregs(fr);                                          \
 151         ret = efi_call_##prefix(                                               \
 152                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 153                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 154                 adjust_arg(data_size), adjust_arg(data));                      \
 155         ia64_load_scratch_fpregs(fr);                                          \
 156         return ret;                                                            \
 157 }
 158
 159 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 160 static efi_status_t                                                            \
 161 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 162                             efi_guid_t *vendor)                                \
 163 {                                                                              \
 164         struct ia64_fpreg fr[6];                                               \
 165         efi_status_t ret;                                                      \
 166                                                                                \
 167         ia64_save_scratch_fpregs(fr);                                          \
 168         ret = efi_call_##prefix(                                               \
 169                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 170                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 171         ia64_load_scratch_fpregs(fr);                                          \
 172         return ret;                                                            \
 173 }
 174
 175 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 176 static efi_status_t                                                            \
 177 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 178                        u32 attr, unsigned long data_size,                      \
 179                        void *data)                                             \
 180 {                                                                              \
 181         struct ia64_fpreg fr[6];                                               \
 182         efi_status_t ret;                                                      \
 183                                                                                \
 184         ia64_save_scratch_fpregs(fr);                                          \
 185         ret = efi_call_##prefix(                                               \
 186                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 187                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 188                 adjust_arg(data));                                             \
 189         ia64_load_scratch_fpregs(fr);                                          \
 190         return ret;                                                            \
 191 }
 192
 193 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 194 static efi_status_t                                                            \
 195 prefix##_get_next_high_mono_count (u32 *count)                                 \
 196 {                                                                              \
 197         struct ia64_fpreg fr[6];                                               \
 198         efi_status_t ret;                                                      \
 199                                                                                \
 200         ia64_save_scratch_fpregs(fr);                                          \
 201         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 202                                 __va(runtime->get_next_high_mono_count),       \
 203                                 adjust_arg(count));                            \
 204         ia64_load_scratch_fpregs(fr);                                          \
 205         return ret;                                                            \
 206 }
 207
 208 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 209 static void                                                                    \
 210 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 211                        unsigned long data_size, efi_char16_t *data)            \
 212 {                                                                              \
 213         struct ia64_fpreg fr[6];                                               \
 214         efi_char16_t *adata = NULL;                                            \
 215                                                                                \
 216         if (data)                                                              \
 217                 adata = adjust_arg(data);                                      \
 218                                                                                \
 219         ia64_save_scratch_fpregs(fr);                                          \
 220         efi_call_##prefix(                                                     \
 221                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 222                 reset_type, status, data_size, adata);                         \
 223         /* should not return, but just in case... */                           \
 224         ia64_load_scratch_fpregs(fr);                                          \
 225 }
 226
 227 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 228
 229 STUB_GET_TIME(phys, phys_ptr)
 230 STUB_SET_TIME(phys, phys_ptr)
 231 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 232 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 233 STUB_GET_VARIABLE(phys, phys_ptr)
 234 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 235 STUB_SET_VARIABLE(phys, phys_ptr)
 236 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 237 STUB_RESET_SYSTEM(phys, phys_ptr)
 238
 239 #define id(arg) arg
 240
 241 STUB_GET_TIME(virt, id)
 242 STUB_SET_TIME(virt, id)
 243 STUB_GET_WAKEUP_TIME(virt, id)
 244 STUB_SET_WAKEUP_TIME(virt, id)
 245 STUB_GET_VARIABLE(virt, id)
 246 STUB_GET_NEXT_VARIABLE(virt, id)
 247 STUB_SET_VARIABLE(virt, id)
 248 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 249 STUB_RESET_SYSTEM(virt, id)
 250
 251 void
 252 efi_gettimeofday (struct timespec64 *ts)
 253 {
 254         efi_time_t tm;
 255
 256         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 257                 memset(ts, 0, sizeof(*ts));
 258                 return;
 259         }
 260
 261         ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
 262                             tm.hour, tm.minute, tm.second);
 263         ts->tv_nsec = tm.nanosecond;
 264 }
 265
 266 static int
 267 is_memory_available (efi_memory_desc_t *md)
 268 {
 269         if (!(md->attribute & EFI_MEMORY_WB))
 270                 return 0;
 271
 272         switch (md->type) {
 273               case EFI_LOADER_CODE:
 274               case EFI_LOADER_DATA:
 275               case EFI_BOOT_SERVICES_CODE:
 276               case EFI_BOOT_SERVICES_DATA:
 277               case EFI_CONVENTIONAL_MEMORY:
 278                 return 1;
 279         }
 280         return 0;
 281 }
 282
 283 typedef struct kern_memdesc {
 284         u64 attribute;
 285         u64 start;
 286         u64 num_pages;
 287 } kern_memdesc_t;
 288
 289 static kern_memdesc_t *kern_memmap;
 290
 291 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 292
 293 static inline u64
 294 kmd_end(kern_memdesc_t *kmd)
 295 {
 296         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 297 }
 298
 299 static inline u64
 300 efi_md_end(efi_memory_desc_t *md)
 301 {
 302         return (md->phys_addr + efi_md_size(md));
 303 }
 304
 305 static inline int
 306 efi_wb(efi_memory_desc_t *md)
 307 {
 308         return (md->attribute & EFI_MEMORY_WB);
 309 }
 310
 311 static inline int
 312 efi_uc(efi_memory_desc_t *md)
 313 {
 314         return (md->attribute & EFI_MEMORY_UC);
 315 }
 316
 317 static void
 318 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 319 {
 320         kern_memdesc_t *k;
 321         u64 start, end, voff;
 322
 323         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 324         for (k = kern_memmap; k->start != ~0UL; k++) {
 325                 if (k->attribute != attr)
 326                         continue;
 327                 start = PAGE_ALIGN(k->start);
 328                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 329                 if (start < end)
 330                         if ((*callback)(start + voff, end + voff, arg) < 0)
 331                                 return;
 332         }
 333 }
 334
 335 /*
 336  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 337  * descriptor that has memory that is available for OS use.
 338  */
 339 void
 340 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 341 {
 342         walk(callback, arg, EFI_MEMORY_WB);
 343 }
 344
 345 /*
 346  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 347  * descriptor that has memory that is available for uncached allocator.
 348  */
 349 void
 350 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 351 {
 352         walk(callback, arg, EFI_MEMORY_UC);
 353 }
 354
 355 /*
 356  * Look for the PAL_CODE region reported by EFI and map it using an
 357  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 358  * Abstraction Layer chapter 11 in ADAG
 359  */
 360 void *
 361 efi_get_pal_addr (void)
 362 {
 363         void *efi_map_start, *efi_map_end, *p;
 364         efi_memory_desc_t *md;
 365         u64 efi_desc_size;
 366         int pal_code_count = 0;
 367         u64 vaddr, mask;
 368
 369         efi_map_start = __va(ia64_boot_param->efi_memmap);
 370         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 371         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 372
 373         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 374                 md = p;
 375                 if (md->type != EFI_PAL_CODE)
 376                         continue;
 377
 378                 if (++pal_code_count > 1) {
 379                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 380                                "dropped @ %llx\n", md->phys_addr);
 381                         continue;
 382                 }
 383                 /*
 384                  * The only ITLB entry in region 7 that is used is the one
 385                  * installed by __start().  That entry covers a 64MB range.
 386                  */
 387                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 388                 vaddr = PAGE_OFFSET + md->phys_addr;
 389
 390                 /*
 391                  * We must check that the PAL mapping won't overlap with the
 392                  * kernel mapping.
 393                  *
 394                  * PAL code is guaranteed to be aligned on a power of 2 between
 395                  * 4k and 256KB and that only one ITR is needed to map it. This
 396                  * implies that the PAL code is always aligned on its size,
 397                  * i.e., the closest matching page size supported by the TLB.
 398                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 399                  * it is bigger than 64MB (very unlikely!).  So for now the
 400                  * following test is enough to determine whether or not we need
 401                  * a dedicated ITR for the PAL code.
 402                  */
 403                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 404                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 405                                __func__);
 406                         continue;
 407                 }
 408
 409                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 410                         panic("Whoa!  PAL code size bigger than a granule!");
 411
 412 #if EFI_DEBUG
 413                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 414
 415                 printk(KERN_INFO "CPU %d: mapping PAL code "
 416                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 417                        smp_processor_id(), md->phys_addr,
 418                        md->phys_addr + efi_md_size(md),
 419                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 420 #endif
 421                 return __va(md->phys_addr);
 422         }
 423         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 424                __func__);
 425         return NULL;
 426 }
 427
 428
 429 static u8 __init palo_checksum(u8 *buffer, u32 length)
 430 {
 431         u8 sum = 0;
 432         u8 *end = buffer + length;
 433
 434         while (buffer < end)
 435                 sum = (u8) (sum + *(buffer++));
 436
 437         return sum;
 438 }
 439
 440 /*
 441  * Parse and handle PALO table which is published at:
 442  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 443  */
 444 static void __init handle_palo(unsigned long phys_addr)
 445 {
 446         struct palo_table *palo = __va(phys_addr);
 447         u8  checksum;
 448
 449         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 450                 printk(KERN_INFO "PALO signature incorrect.\n");
 451                 return;
 452         }
 453
 454         checksum = palo_checksum((u8 *)palo, palo->length);
 455         if (checksum) {
 456                 printk(KERN_INFO "PALO checksum incorrect.\n");
 457                 return;
 458         }
 459
 460         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 461 }
 462
 463 void
 464 efi_map_pal_code (void)
 465 {
 466         void *pal_vaddr = efi_get_pal_addr ();
 467         u64 psr;
 468
 469         if (!pal_vaddr)
 470                 return;
 471
 472         /*
 473          * Cannot write to CRx with PSR.ic=1
 474          */
 475         psr = ia64_clear_ic();
 476         ia64_itr(0x1, IA64_TR_PALCODE,
 477                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 478                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 479                  IA64_GRANULE_SHIFT);
 480         ia64_set_psr(psr);              /* restore psr */
 481 }
 482
 483 void __init
 484 efi_init (void)
 485 {
 486         const efi_system_table_t *efi_systab;
 487         void *efi_map_start, *efi_map_end;
 488         u64 efi_desc_size;
 489         char *cp;
 490
 491         set_bit(EFI_BOOT, &efi.flags);
 492         set_bit(EFI_64BIT, &efi.flags);
 493
 494         /*
 495          * It's too early to be able to use the standard kernel command line
 496          * support...
 497          */
 498         for (cp = boot_command_line; *cp; ) {
 499                 if (memcmp(cp, "mem=", 4) == 0) {
 500                         mem_limit = memparse(cp + 4, &cp);
 501                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 502                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 503                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 504                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 505                 } else {
 506                         while (*cp != ' ' && *cp)
 507                                 ++cp;
 508                         while (*cp == ' ')
 509                                 ++cp;
 510                 }
 511         }
 512         if (min_addr != 0UL)
 513                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 514                        min_addr >> 20);
 515         if (max_addr != ~0UL)
 516                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 517                        max_addr >> 20);
 518
 519         efi_systab = __va(ia64_boot_param->efi_systab);
 520
 521         /*
 522          * Verify the EFI Table
 523          */
 524         if (efi_systab == NULL)
 525                 panic("Whoa! Can't find EFI system table.\n");
 526         if (efi_systab_check_header(&efi_systab->hdr, 1))
 527                 panic("Whoa! EFI system table signature incorrect\n");
 528
 529         efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
 530
 531         palo_phys      = EFI_INVALID_TABLE_ADDR;
 532
 533         if (efi_config_parse_tables(__va(efi_systab->tables),
 534                                     efi_systab->nr_tables,
 535                                     arch_tables) != 0)
 536                 return;
 537
 538         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 539                 handle_palo(palo_phys);
 540
 541         runtime = __va(efi_systab->runtime);
 542         efi.get_time = phys_get_time;
 543         efi.set_time = phys_set_time;
 544         efi.get_wakeup_time = phys_get_wakeup_time;
 545         efi.set_wakeup_time = phys_set_wakeup_time;
 546         efi.get_variable = phys_get_variable;
 547         efi.get_next_variable = phys_get_next_variable;
 548         efi.set_variable = phys_set_variable;
 549         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 550         efi.reset_system = phys_reset_system;
 551
 552         efi_map_start = __va(ia64_boot_param->efi_memmap);
 553         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 554         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 555
 556 #if EFI_DEBUG
 557         /* print EFI memory map: */
 558         {
 559                 efi_memory_desc_t *md;
 560                 void *p;
 561
 562                 for (i = 0, p = efi_map_start; p < efi_map_end;
 563                      ++i, p += efi_desc_size)
 564                 {
 565                         const char *unit;
 566                         unsigned long size;
 567                         char buf[64];
 568
 569                         md = p;
 570                         size = md->num_pages << EFI_PAGE_SHIFT;
 571
 572                         if ((size >> 40) > 0) {
 573                                 size >>= 40;
 574                                 unit = "TB";
 575                         } else if ((size >> 30) > 0) {
 576                                 size >>= 30;
 577                                 unit = "GB";
 578                         } else if ((size >> 20) > 0) {
 579                                 size >>= 20;
 580                                 unit = "MB";
 581                         } else {
 582                                 size >>= 10;
 583                                 unit = "KB";
 584                         }
 585
 586                         printk("mem%02d: %s "
 587                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 588                                i, efi_md_typeattr_format(buf, sizeof(buf), md),
 589                                md->phys_addr,
 590                                md->phys_addr + efi_md_size(md), size, unit);
 591                 }
 592         }
 593 #endif
 594
 595         efi_map_pal_code();
 596         efi_enter_virtual_mode();
 597 }
 598
 599 void
 600 efi_enter_virtual_mode (void)
 601 {
 602         void *efi_map_start, *efi_map_end, *p;
 603         efi_memory_desc_t *md;
 604         efi_status_t status;
 605         u64 efi_desc_size;
 606
 607         efi_map_start = __va(ia64_boot_param->efi_memmap);
 608         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 609         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 610
 611         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 612                 md = p;
 613                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 614                         /*
 615                          * Some descriptors have multiple bits set, so the
 616                          * order of the tests is relevant.
 617                          */
 618                         if (md->attribute & EFI_MEMORY_WB) {
 619                                 md->virt_addr = (u64) __va(md->phys_addr);
 620                         } else if (md->attribute & EFI_MEMORY_UC) {
 621                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 622                         } else if (md->attribute & EFI_MEMORY_WC) {
 623 #if 0
 624                                 md->virt_addr = ia64_remap(md->phys_addr,
 625                                                            (_PAGE_A |
 626                                                             _PAGE_P |
 627                                                             _PAGE_D |
 628                                                             _PAGE_MA_WC |
 629                                                             _PAGE_PL_0 |
 630                                                             _PAGE_AR_RW));
 631 #else
 632                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 633                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 634 #endif
 635                         } else if (md->attribute & EFI_MEMORY_WT) {
 636 #if 0
 637                                 md->virt_addr = ia64_remap(md->phys_addr,
 638                                                            (_PAGE_A |
 639                                                             _PAGE_P |
 640                                                             _PAGE_D |
 641                                                             _PAGE_MA_WT |
 642                                                             _PAGE_PL_0 |
 643                                                             _PAGE_AR_RW));
 644 #else
 645                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 646                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 647 #endif
 648                         }
 649                 }
 650         }
 651
 652         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 653                                ia64_boot_param->efi_memmap_size,
 654                                efi_desc_size,
 655                                ia64_boot_param->efi_memdesc_version,
 656                                ia64_boot_param->efi_memmap);
 657         if (status != EFI_SUCCESS) {
 658                 printk(KERN_WARNING "warning: unable to switch EFI into "
 659                        "virtual mode (status=%lu)\n", status);
 660                 return;
 661         }
 662
 663         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 664
 665         /*
 666          * Now that EFI is in virtual mode, we call the EFI functions more
 667          * efficiently:
 668          */
 669         efi.get_time = virt_get_time;
 670         efi.set_time = virt_set_time;
 671         efi.get_wakeup_time = virt_get_wakeup_time;
 672         efi.set_wakeup_time = virt_set_wakeup_time;
 673         efi.get_variable = virt_get_variable;
 674         efi.get_next_variable = virt_get_next_variable;
 675         efi.set_variable = virt_set_variable;
 676         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 677         efi.reset_system = virt_reset_system;
 678 }
 679
 680 /*
 681  * Walk the EFI memory map looking for the I/O port range.  There can only be
 682  * one entry of this type, other I/O port ranges should be described via ACPI.
 683  */
 684 u64
 685 efi_get_iobase (void)
 686 {
 687         void *efi_map_start, *efi_map_end, *p;
 688         efi_memory_desc_t *md;
 689         u64 efi_desc_size;
 690
 691         efi_map_start = __va(ia64_boot_param->efi_memmap);
 692         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 693         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 694
 695         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 696                 md = p;
 697                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 698                         if (md->attribute & EFI_MEMORY_UC)
 699                                 return md->phys_addr;
 700                 }
 701         }
 702         return 0;
 703 }
 704
 705 static struct kern_memdesc *
 706 kern_memory_descriptor (unsigned long phys_addr)
 707 {
 708         struct kern_memdesc *md;
 709
 710         for (md = kern_memmap; md->start != ~0UL; md++) {
 711                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 712                          return md;
 713         }
 714         return NULL;
 715 }
 716
 717 static efi_memory_desc_t *
 718 efi_memory_descriptor (unsigned long phys_addr)
 719 {
 720         void *efi_map_start, *efi_map_end, *p;
 721         efi_memory_desc_t *md;
 722         u64 efi_desc_size;
 723
 724         efi_map_start = __va(ia64_boot_param->efi_memmap);
 725         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 726         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 727
 728         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 729                 md = p;
 730
 731                 if (phys_addr - md->phys_addr < efi_md_size(md))
 732                          return md;
 733         }
 734         return NULL;
 735 }
 736
 737 static int
 738 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 739 {
 740         void *efi_map_start, *efi_map_end, *p;
 741         efi_memory_desc_t *md;
 742         u64 efi_desc_size;
 743         unsigned long end;
 744
 745         efi_map_start = __va(ia64_boot_param->efi_memmap);
 746         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 747         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 748
 749         end = phys_addr + size;
 750
 751         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 752                 md = p;
 753                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 754                         return 1;
 755         }
 756         return 0;
 757 }
 758
 759 int
 760 efi_mem_type (unsigned long phys_addr)
 761 {
 762         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 763
 764         if (md)
 765                 return md->type;
 766         return -EINVAL;
 767 }
 768
 769 u64
 770 efi_mem_attributes (unsigned long phys_addr)
 771 {
 772         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 773
 774         if (md)
 775                 return md->attribute;
 776         return 0;
 777 }
 778 EXPORT_SYMBOL(efi_mem_attributes);
 779
 780 u64
 781 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 782 {
 783         unsigned long end = phys_addr + size;
 784         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 785         u64 attr;
 786
 787         if (!md)
 788                 return 0;
 789
 790         /*
 791          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 792          * the kernel that firmware needs this region mapped.
 793          */
 794         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 795         do {
 796                 unsigned long md_end = efi_md_end(md);
 797
 798                 if (end <= md_end)
 799                         return attr;
 800
 801                 md = efi_memory_descriptor(md_end);
 802                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 803                         return 0;
 804         } while (md);
 805         return 0;       /* never reached */
 806 }
 807
 808 u64
 809 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 810 {
 811         unsigned long end = phys_addr + size;
 812         struct kern_memdesc *md;
 813         u64 attr;
 814
 815         /*
 816          * This is a hack for ioremap calls before we set up kern_memmap.
 817          * Maybe we should do efi_memmap_init() earlier instead.
 818          */
 819         if (!kern_memmap) {
 820                 attr = efi_mem_attribute(phys_addr, size);
 821                 if (attr & EFI_MEMORY_WB)
 822                         return EFI_MEMORY_WB;
 823                 return 0;
 824         }
 825
 826         md = kern_memory_descriptor(phys_addr);
 827         if (!md)
 828                 return 0;
 829
 830         attr = md->attribute;
 831         do {
 832                 unsigned long md_end = kmd_end(md);
 833
 834                 if (end <= md_end)
 835                         return attr;
 836
 837                 md = kern_memory_descriptor(md_end);
 838                 if (!md || md->attribute != attr)
 839                         return 0;
 840         } while (md);
 841         return 0;       /* never reached */
 842 }
 843
 844 int
 845 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
 846 {
 847         u64 attr;
 848
 849         /*
 850          * /dev/mem reads and writes use copy_to_user(), which implicitly
 851          * uses a granule-sized kernel identity mapping.  It's really
 852          * only safe to do this for regions in kern_memmap.  For more
 853          * details, see Documentation/ia64/aliasing.rst.
 854          */
 855         attr = kern_mem_attribute(phys_addr, size);
 856         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 857                 return 1;
 858         return 0;
 859 }
 860
 861 int
 862 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 863 {
 864         unsigned long phys_addr = pfn << PAGE_SHIFT;
 865         u64 attr;
 866
 867         attr = efi_mem_attribute(phys_addr, size);
 868
 869         /*
 870          * /dev/mem mmap uses normal user pages, so we don't need the entire
 871          * granule, but the entire region we're mapping must support the same
 872          * attribute.
 873          */
 874         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 875                 return 1;
 876
 877         /*
 878          * Intel firmware doesn't tell us about all the MMIO regions, so
 879          * in general we have to allow mmap requests.  But if EFI *does*
 880          * tell us about anything inside this region, we should deny it.
 881          * The user can always map a smaller region to avoid the overlap.
 882          */
 883         if (efi_memmap_intersects(phys_addr, size))
 884                 return 0;
 885
 886         return 1;
 887 }
 888
 889 pgprot_t
 890 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 891                      pgprot_t vma_prot)
 892 {
 893         unsigned long phys_addr = pfn << PAGE_SHIFT;
 894         u64 attr;
 895
 896         /*
 897          * For /dev/mem mmap, we use user mappings, but if the region is
 898          * in kern_memmap (and hence may be covered by a kernel mapping),
 899          * we must use the same attribute as the kernel mapping.
 900          */
 901         attr = kern_mem_attribute(phys_addr, size);
 902         if (attr & EFI_MEMORY_WB)
 903                 return pgprot_cacheable(vma_prot);
 904         else if (attr & EFI_MEMORY_UC)
 905                 return pgprot_noncached(vma_prot);
 906
 907         /*
 908          * Some chipsets don't support UC access to memory.  If
 909          * WB is supported, we prefer that.
 910          */
 911         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 912                 return pgprot_cacheable(vma_prot);
 913
 914         return pgprot_noncached(vma_prot);
 915 }
 916
 917 int __init
 918 efi_uart_console_only(void)
 919 {
 920         efi_status_t status;
 921         char *s, name[] = "ConOut";
 922         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 923         efi_char16_t *utf16, name_utf16[32];
 924         unsigned char data[1024];
 925         unsigned long size = sizeof(data);
 926         struct efi_generic_dev_path *hdr, *end_addr;
 927         int uart = 0;
 928
 929         /* Convert to UTF-16 */
 930         utf16 = name_utf16;
 931         s = name;
 932         while (*s)
 933                 *utf16++ = *s++ & 0x7f;
 934         *utf16 = 0;
 935
 936         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 937         if (status != EFI_SUCCESS) {
 938                 printk(KERN_ERR "No EFI %s variable?\n", name);
 939                 return 0;
 940         }
 941
 942         hdr = (struct efi_generic_dev_path *) data;
 943         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 944         while (hdr < end_addr) {
 945                 if (hdr->type == EFI_DEV_MSG &&
 946                     hdr->sub_type == EFI_DEV_MSG_UART)
 947                         uart = 1;
 948                 else if (hdr->type == EFI_DEV_END_PATH ||
 949                           hdr->type == EFI_DEV_END_PATH2) {
 950                         if (!uart)
 951                                 return 0;
 952                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 953                                 return 1;
 954                         uart = 0;
 955                 }
 956                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 957         }
 958         printk(KERN_ERR "Malformed %s value\n", name);
 959         return 0;
 960 }
 961
 962 /*
 963  * Look for the first granule aligned memory descriptor memory
 964  * that is big enough to hold EFI memory map. Make sure this
 965  * descriptor is at least granule sized so it does not get trimmed
 966  */
 967 struct kern_memdesc *
 968 find_memmap_space (void)
 969 {
 970         u64     contig_low=0, contig_high=0;
 971         u64     as = 0, ae;
 972         void *efi_map_start, *efi_map_end, *p, *q;
 973         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 974         u64     space_needed, efi_desc_size;
 975         unsigned long total_mem = 0;
 976
 977         efi_map_start = __va(ia64_boot_param->efi_memmap);
 978         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 979         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 980
 981         /*
 982          * Worst case: we need 3 kernel descriptors for each efi descriptor
 983          * (if every entry has a WB part in the middle, and UC head and tail),
 984          * plus one for the end marker.
 985          */
 986         space_needed = sizeof(kern_memdesc_t) *
 987                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 988
 989         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 990                 md = p;
 991                 if (!efi_wb(md)) {
 992                         continue;
 993                 }
 994                 if (pmd == NULL || !efi_wb(pmd) ||
 995                     efi_md_end(pmd) != md->phys_addr) {
 996                         contig_low = GRANULEROUNDUP(md->phys_addr);
 997                         contig_high = efi_md_end(md);
 998                         for (q = p + efi_desc_size; q < efi_map_end;
 999                              q += efi_desc_size) {
1000                                 check_md = q;
1001                                 if (!efi_wb(check_md))
1002                                         break;
1003                                 if (contig_high != check_md->phys_addr)
1004                                         break;
1005                                 contig_high = efi_md_end(check_md);
1006                         }
1007                         contig_high = GRANULEROUNDDOWN(contig_high);
1008                 }
1009                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1010                         continue;
1011
1012                 /* Round ends inward to granule boundaries */
1013                 as = max(contig_low, md->phys_addr);
1014                 ae = min(contig_high, efi_md_end(md));
1015
1016                 /* keep within max_addr= and min_addr= command line arg */
1017                 as = max(as, min_addr);
1018                 ae = min(ae, max_addr);
1019                 if (ae <= as)
1020                         continue;
1021
1022                 /* avoid going over mem= command line arg */
1023                 if (total_mem + (ae - as) > mem_limit)
1024                         ae -= total_mem + (ae - as) - mem_limit;
1025
1026                 if (ae <= as)
1027                         continue;
1028
1029                 if (ae - as > space_needed)
1030                         break;
1031         }
1032         if (p >= efi_map_end)
1033                 panic("Can't allocate space for kernel memory descriptors");
1034
1035         return __va(as);
1036 }
1037
1038 /*
1039  * Walk the EFI memory map and gather all memory available for kernel
1040  * to use.  We can allocate partial granules only if the unavailable
1041  * parts exist, and are WB.
1042  */
1043 unsigned long
1044 efi_memmap_init(u64 *s, u64 *e)
1045 {
1046         struct kern_memdesc *k, *prev = NULL;
1047         u64     contig_low=0, contig_high=0;
1048         u64     as, ae, lim;
1049         void *efi_map_start, *efi_map_end, *p, *q;
1050         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1051         u64     efi_desc_size;
1052         unsigned long total_mem = 0;
1053
1054         k = kern_memmap = find_memmap_space();
1055
1056         efi_map_start = __va(ia64_boot_param->efi_memmap);
1057         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1058         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1059
1060         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1061                 md = p;
1062                 if (!efi_wb(md)) {
1063                         if (efi_uc(md) &&
1064                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1065                              md->type == EFI_BOOT_SERVICES_DATA)) {
1066                                 k->attribute = EFI_MEMORY_UC;
1067                                 k->start = md->phys_addr;
1068                                 k->num_pages = md->num_pages;
1069                                 k++;
1070                         }
1071                         continue;
1072                 }
1073                 if (pmd == NULL || !efi_wb(pmd) ||
1074                     efi_md_end(pmd) != md->phys_addr) {
1075                         contig_low = GRANULEROUNDUP(md->phys_addr);
1076                         contig_high = efi_md_end(md);
1077                         for (q = p + efi_desc_size; q < efi_map_end;
1078                              q += efi_desc_size) {
1079                                 check_md = q;
1080                                 if (!efi_wb(check_md))
1081                                         break;
1082                                 if (contig_high != check_md->phys_addr)
1083                                         break;
1084                                 contig_high = efi_md_end(check_md);
1085                         }
1086                         contig_high = GRANULEROUNDDOWN(contig_high);
1087                 }
1088                 if (!is_memory_available(md))
1089                         continue;
1090
1091                 /*
1092                  * Round ends inward to granule boundaries
1093                  * Give trimmings to uncached allocator
1094                  */
1095                 if (md->phys_addr < contig_low) {
1096                         lim = min(efi_md_end(md), contig_low);
1097                         if (efi_uc(md)) {
1098                                 if (k > kern_memmap &&
1099                                     (k-1)->attribute == EFI_MEMORY_UC &&
1100                                     kmd_end(k-1) == md->phys_addr) {
1101                                         (k-1)->num_pages +=
1102                                                 (lim - md->phys_addr)
1103                                                 >> EFI_PAGE_SHIFT;
1104                                 } else {
1105                                         k->attribute = EFI_MEMORY_UC;
1106                                         k->start = md->phys_addr;
1107                                         k->num_pages = (lim - md->phys_addr)
1108                                                 >> EFI_PAGE_SHIFT;
1109                                         k++;
1110                                 }
1111                         }
1112                         as = contig_low;
1113                 } else
1114                         as = md->phys_addr;
1115
1116                 if (efi_md_end(md) > contig_high) {
1117                         lim = max(md->phys_addr, contig_high);
1118                         if (efi_uc(md)) {
1119                                 if (lim == md->phys_addr && k > kern_memmap &&
1120                                     (k-1)->attribute == EFI_MEMORY_UC &&
1121                                     kmd_end(k-1) == md->phys_addr) {
1122                                         (k-1)->num_pages += md->num_pages;
1123                                 } else {
1124                                         k->attribute = EFI_MEMORY_UC;
1125                                         k->start = lim;
1126                                         k->num_pages = (efi_md_end(md) - lim)
1127                                                 >> EFI_PAGE_SHIFT;
1128                                         k++;
1129                                 }
1130                         }
1131                         ae = contig_high;
1132                 } else
1133                         ae = efi_md_end(md);
1134
1135                 /* keep within max_addr= and min_addr= command line arg */
1136                 as = max(as, min_addr);
1137                 ae = min(ae, max_addr);
1138                 if (ae <= as)
1139                         continue;
1140
1141                 /* avoid going over mem= command line arg */
1142                 if (total_mem + (ae - as) > mem_limit)
1143                         ae -= total_mem + (ae - as) - mem_limit;
1144
1145                 if (ae <= as)
1146                         continue;
1147                 if (prev && kmd_end(prev) == md->phys_addr) {
1148                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1149                         total_mem += ae - as;
1150                         continue;
1151                 }
1152                 k->attribute = EFI_MEMORY_WB;
1153                 k->start = as;
1154                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1155                 total_mem += ae - as;
1156                 prev = k++;
1157         }
1158         k->start = ~0L; /* end-marker */
1159
1160         /* reserve the memory we are using for kern_memmap */
1161         *s = (u64)kern_memmap;
1162         *e = (u64)++k;
1163
1164         return total_mem;
1165 }
1166
1167 void
1168 efi_initialize_iomem_resources(struct resource *code_resource,
1169                                struct resource *data_resource,
1170                                struct resource *bss_resource)
1171 {
1172         struct resource *res;
1173         void *efi_map_start, *efi_map_end, *p;
1174         efi_memory_desc_t *md;
1175         u64 efi_desc_size;
1176         char *name;
1177         unsigned long flags, desc;
1178
1179         efi_map_start = __va(ia64_boot_param->efi_memmap);
1180         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1181         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1182
1183         res = NULL;
1184
1185         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1186                 md = p;
1187
1188                 if (md->num_pages == 0) /* should not happen */
1189                         continue;
1190
1191                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1192                 desc = IORES_DESC_NONE;
1193
1194                 switch (md->type) {
1195
1196                         case EFI_MEMORY_MAPPED_IO:
1197                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1198                                 continue;
1199
1200                         case EFI_LOADER_CODE:
1201                         case EFI_LOADER_DATA:
1202                         case EFI_BOOT_SERVICES_DATA:
1203                         case EFI_BOOT_SERVICES_CODE:
1204                         case EFI_CONVENTIONAL_MEMORY:
1205                                 if (md->attribute & EFI_MEMORY_WP) {
1206                                         name = "System ROM";
1207                                         flags |= IORESOURCE_READONLY;
1208                                 } else if (md->attribute == EFI_MEMORY_UC) {
1209                                         name = "Uncached RAM";
1210                                 } else {
1211                                         name = "System RAM";
1212                                         flags |= IORESOURCE_SYSRAM;
1213                                 }
1214                                 break;
1215
1216                         case EFI_ACPI_MEMORY_NVS:
1217                                 name = "ACPI Non-volatile Storage";
1218                                 desc = IORES_DESC_ACPI_NV_STORAGE;
1219                                 break;
1220
1221                         case EFI_UNUSABLE_MEMORY:
1222                                 name = "reserved";
1223                                 flags |= IORESOURCE_DISABLED;
1224                                 break;
1225
1226                         case EFI_PERSISTENT_MEMORY:
1227                                 name = "Persistent Memory";
1228                                 desc = IORES_DESC_PERSISTENT_MEMORY;
1229                                 break;
1230
1231                         case EFI_RESERVED_TYPE:
1232                         case EFI_RUNTIME_SERVICES_CODE:
1233                         case EFI_RUNTIME_SERVICES_DATA:
1234                         case EFI_ACPI_RECLAIM_MEMORY:
1235                         default:
1236                                 name = "reserved";
1237                                 break;
1238                 }
1239
1240                 if ((res = kzalloc(sizeof(struct resource),
1241                                    GFP_KERNEL)) == NULL) {
1242                         printk(KERN_ERR
1243                                "failed to allocate resource for iomem\n");
1244                         return;
1245                 }
1246
1247                 res->name = name;
1248                 res->start = md->phys_addr;
1249                 res->end = md->phys_addr + efi_md_size(md) - 1;
1250                 res->flags = flags;
1251                 res->desc = desc;
1252
1253                 if (insert_resource(&iomem_resource, res) < 0)
1254                         kfree(res);
1255                 else {
1256                         /*
1257                          * We don't know which region contains
1258                          * kernel data so we try it repeatedly and
1259                          * let the resource manager test it.
1260                          */
1261                         insert_resource(res, code_resource);
1262                         insert_resource(res, data_resource);
1263                         insert_resource(res, bss_resource);
1264 #ifdef CONFIG_KEXEC
1265                         insert_resource(res, &efi_memmap_res);
1266                         insert_resource(res, &boot_param_res);
1267                         if (crashk_res.end > crashk_res.start)
1268                                 insert_resource(res, &crashk_res);
1269 #endif
1270                 }
1271         }
1272 }
1273
1274 #ifdef CONFIG_KEXEC
1275 /* find a block of memory aligned to 64M exclude reserved regions
1276    rsvd_regions are sorted
1277  */
1278 unsigned long __init
1279 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1280 {
1281         int i;
1282         u64 start, end;
1283         u64 alignment = 1UL << _PAGE_SIZE_64M;
1284         void *efi_map_start, *efi_map_end, *p;
1285         efi_memory_desc_t *md;
1286         u64 efi_desc_size;
1287
1288         efi_map_start = __va(ia64_boot_param->efi_memmap);
1289         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1290         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1291
1292         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1293                 md = p;
1294                 if (!efi_wb(md))
1295                         continue;
1296                 start = ALIGN(md->phys_addr, alignment);
1297                 end = efi_md_end(md);
1298                 for (i = 0; i < n; i++) {
1299                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1300                                 if (__pa(r[i].start) > start + size)
1301                                         return start;
1302                                 start = ALIGN(__pa(r[i].end), alignment);
1303                                 if (i < n-1 &&
1304                                     __pa(r[i+1].start) < start + size)
1305                                         continue;
1306                                 else
1307                                         break;
1308                         }
1309                 }
1310                 if (end > start + size)
1311                         return start;
1312         }
1313
1314         printk(KERN_WARNING
1315                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1316         return ~0UL;
1317 }
1318 #endif
1319
1320 #ifdef CONFIG_CRASH_DUMP
1321 /* locate the size find a the descriptor at a certain address */
1322 unsigned long __init
1323 vmcore_find_descriptor_size (unsigned long address)
1324 {
1325         void *efi_map_start, *efi_map_end, *p;
1326         efi_memory_desc_t *md;
1327         u64 efi_desc_size;
1328         unsigned long ret = 0;
1329
1330         efi_map_start = __va(ia64_boot_param->efi_memmap);
1331         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1332         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1333
1334         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1335                 md = p;
1336                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1337                     && md->phys_addr == address) {
1338                         ret = efi_md_size(md);
1339                         break;
1340                 }
1341         }
1342
1343         if (ret == 0)
1344                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1345
1346         return ret;
1347 }
1348 #endif
1349
1350 char *efi_systab_show_arch(char *str)
1351 {
1352         if (mps_phys != EFI_INVALID_TABLE_ADDR)
1353                 str += sprintf(str, "MPS=0x%lx\n", mps_phys);
1354         if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
1355                 str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);
1356         return str;
1357 }