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/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/setup.h>
  44 #include <asm/tlbflush.h>
  45
  46 #define EFI_DEBUG       0
  47
  48 #define ESI_TABLE_GUID                                  \
  49     EFI_GUID(0x43EA58DC, 0xCF28, 0x4b06, 0xB3,          \
  50              0x91, 0xB7, 0x50, 0x59, 0x34, 0x2B, 0xD4)
  51
  52 static unsigned long mps_phys = EFI_INVALID_TABLE_ADDR;
  53 static __initdata unsigned long palo_phys;
  54
  55 unsigned long __initdata esi_phys = EFI_INVALID_TABLE_ADDR;
  56 unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
  57 unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;
  58
  59 static const efi_config_table_type_t arch_tables[] __initconst = {
  60         {ESI_TABLE_GUID,                                &esi_phys,              "ESI"           },
  61         {HCDP_TABLE_GUID,                               &hcdp_phys,             "HCDP"          },
  62         {MPS_TABLE_GUID,                                &mps_phys,              "MPS"           },
  63         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID,    &palo_phys,             "PALO"          },
  64         {SAL_SYSTEM_TABLE_GUID,                         &sal_systab_phys,       "SALsystab"     },
  65         {},
  66 };
  67
  68 extern efi_status_t efi_call_phys (void *, ...);
  69
  70 static efi_runtime_services_t *runtime;
  71 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  72
  73 #define efi_call_virt(f, args...)       (*(f))(args)
  74
  75 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  76 static efi_status_t                                                            \
  77 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  78 {                                                                              \
  79         struct ia64_fpreg fr[6];                                               \
  80         efi_time_cap_t *atc = NULL;                                            \
  81         efi_status_t ret;                                                      \
  82                                                                                \
  83         if (tc)                                                                \
  84                 atc = adjust_arg(tc);                                          \
  85         ia64_save_scratch_fpregs(fr);                                          \
  86         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  87                                 adjust_arg(tm), atc);                          \
  88         ia64_load_scratch_fpregs(fr);                                          \
  89         return ret;                                                            \
  90 }
  91
  92 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  93 static efi_status_t                                                            \
  94 prefix##_set_time (efi_time_t *tm)                                             \
  95 {                                                                              \
  96         struct ia64_fpreg fr[6];                                               \
  97         efi_status_t ret;                                                      \
  98                                                                                \
  99         ia64_save_scratch_fpregs(fr);                                          \
 100         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
 101                                 adjust_arg(tm));                               \
 102         ia64_load_scratch_fpregs(fr);                                          \
 103         return ret;                                                            \
 104 }
 105
 106 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
 107 static efi_status_t                                                            \
 108 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
 109                           efi_time_t *tm)                                      \
 110 {                                                                              \
 111         struct ia64_fpreg fr[6];                                               \
 112         efi_status_t ret;                                                      \
 113                                                                                \
 114         ia64_save_scratch_fpregs(fr);                                          \
 115         ret = efi_call_##prefix(                                               \
 116                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
 117                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
 118         ia64_load_scratch_fpregs(fr);                                          \
 119         return ret;                                                            \
 120 }
 121
 122 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 123 static efi_status_t                                                            \
 124 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 125 {                                                                              \
 126         struct ia64_fpreg fr[6];                                               \
 127         efi_time_t *atm = NULL;                                                \
 128         efi_status_t ret;                                                      \
 129                                                                                \
 130         if (tm)                                                                \
 131                 atm = adjust_arg(tm);                                          \
 132         ia64_save_scratch_fpregs(fr);                                          \
 133         ret = efi_call_##prefix(                                               \
 134                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 135                 enabled, atm);                                                 \
 136         ia64_load_scratch_fpregs(fr);                                          \
 137         return ret;                                                            \
 138 }
 139
 140 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 141 static efi_status_t                                                            \
 142 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 143                        unsigned long *data_size, void *data)                   \
 144 {                                                                              \
 145         struct ia64_fpreg fr[6];                                               \
 146         u32 *aattr = NULL;                                                     \
 147         efi_status_t ret;                                                      \
 148                                                                                \
 149         if (attr)                                                              \
 150                 aattr = adjust_arg(attr);                                      \
 151         ia64_save_scratch_fpregs(fr);                                          \
 152         ret = efi_call_##prefix(                                               \
 153                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 154                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 155                 adjust_arg(data_size), adjust_arg(data));                      \
 156         ia64_load_scratch_fpregs(fr);                                          \
 157         return ret;                                                            \
 158 }
 159
 160 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 161 static efi_status_t                                                            \
 162 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 163                             efi_guid_t *vendor)                                \
 164 {                                                                              \
 165         struct ia64_fpreg fr[6];                                               \
 166         efi_status_t ret;                                                      \
 167                                                                                \
 168         ia64_save_scratch_fpregs(fr);                                          \
 169         ret = efi_call_##prefix(                                               \
 170                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 171                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 172         ia64_load_scratch_fpregs(fr);                                          \
 173         return ret;                                                            \
 174 }
 175
 176 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 177 static efi_status_t                                                            \
 178 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 179                        u32 attr, unsigned long data_size,                      \
 180                        void *data)                                             \
 181 {                                                                              \
 182         struct ia64_fpreg fr[6];                                               \
 183         efi_status_t ret;                                                      \
 184                                                                                \
 185         ia64_save_scratch_fpregs(fr);                                          \
 186         ret = efi_call_##prefix(                                               \
 187                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 188                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 189                 adjust_arg(data));                                             \
 190         ia64_load_scratch_fpregs(fr);                                          \
 191         return ret;                                                            \
 192 }
 193
 194 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 195 static efi_status_t                                                            \
 196 prefix##_get_next_high_mono_count (u32 *count)                                 \
 197 {                                                                              \
 198         struct ia64_fpreg fr[6];                                               \
 199         efi_status_t ret;                                                      \
 200                                                                                \
 201         ia64_save_scratch_fpregs(fr);                                          \
 202         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 203                                 __va(runtime->get_next_high_mono_count),       \
 204                                 adjust_arg(count));                            \
 205         ia64_load_scratch_fpregs(fr);                                          \
 206         return ret;                                                            \
 207 }
 208
 209 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 210 static void                                                                    \
 211 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 212                        unsigned long data_size, efi_char16_t *data)            \
 213 {                                                                              \
 214         struct ia64_fpreg fr[6];                                               \
 215         efi_char16_t *adata = NULL;                                            \
 216                                                                                \
 217         if (data)                                                              \
 218                 adata = adjust_arg(data);                                      \
 219                                                                                \
 220         ia64_save_scratch_fpregs(fr);                                          \
 221         efi_call_##prefix(                                                     \
 222                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 223                 reset_type, status, data_size, adata);                         \
 224         /* should not return, but just in case... */                           \
 225         ia64_load_scratch_fpregs(fr);                                          \
 226 }
 227
 228 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 229
 230 STUB_GET_TIME(phys, phys_ptr)
 231 STUB_SET_TIME(phys, phys_ptr)
 232 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 233 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 234 STUB_GET_VARIABLE(phys, phys_ptr)
 235 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 236 STUB_SET_VARIABLE(phys, phys_ptr)
 237 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 238 STUB_RESET_SYSTEM(phys, phys_ptr)
 239
 240 #define id(arg) arg
 241
 242 STUB_GET_TIME(virt, id)
 243 STUB_SET_TIME(virt, id)
 244 STUB_GET_WAKEUP_TIME(virt, id)
 245 STUB_SET_WAKEUP_TIME(virt, id)
 246 STUB_GET_VARIABLE(virt, id)
 247 STUB_GET_NEXT_VARIABLE(virt, id)
 248 STUB_SET_VARIABLE(virt, id)
 249 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 250 STUB_RESET_SYSTEM(virt, id)
 251
 252 void
 253 efi_gettimeofday (struct timespec64 *ts)
 254 {
 255         efi_time_t tm;
 256
 257         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 258                 memset(ts, 0, sizeof(*ts));
 259                 return;
 260         }
 261
 262         ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
 263                             tm.hour, tm.minute, tm.second);
 264         ts->tv_nsec = tm.nanosecond;
 265 }
 266
 267 static int
 268 is_memory_available (efi_memory_desc_t *md)
 269 {
 270         if (!(md->attribute & EFI_MEMORY_WB))
 271                 return 0;
 272
 273         switch (md->type) {
 274               case EFI_LOADER_CODE:
 275               case EFI_LOADER_DATA:
 276               case EFI_BOOT_SERVICES_CODE:
 277               case EFI_BOOT_SERVICES_DATA:
 278               case EFI_CONVENTIONAL_MEMORY:
 279                 return 1;
 280         }
 281         return 0;
 282 }
 283
 284 typedef struct kern_memdesc {
 285         u64 attribute;
 286         u64 start;
 287         u64 num_pages;
 288 } kern_memdesc_t;
 289
 290 static kern_memdesc_t *kern_memmap;
 291
 292 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 293
 294 static inline u64
 295 kmd_end(kern_memdesc_t *kmd)
 296 {
 297         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 298 }
 299
 300 static inline u64
 301 efi_md_end(efi_memory_desc_t *md)
 302 {
 303         return (md->phys_addr + efi_md_size(md));
 304 }
 305
 306 static inline int
 307 efi_wb(efi_memory_desc_t *md)
 308 {
 309         return (md->attribute & EFI_MEMORY_WB);
 310 }
 311
 312 static inline int
 313 efi_uc(efi_memory_desc_t *md)
 314 {
 315         return (md->attribute & EFI_MEMORY_UC);
 316 }
 317
 318 static void
 319 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 320 {
 321         kern_memdesc_t *k;
 322         u64 start, end, voff;
 323
 324         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 325         for (k = kern_memmap; k->start != ~0UL; k++) {
 326                 if (k->attribute != attr)
 327                         continue;
 328                 start = PAGE_ALIGN(k->start);
 329                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 330                 if (start < end)
 331                         if ((*callback)(start + voff, end + voff, arg) < 0)
 332                                 return;
 333         }
 334 }
 335
 336 /*
 337  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 338  * descriptor that has memory that is available for OS use.
 339  */
 340 void
 341 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 342 {
 343         walk(callback, arg, EFI_MEMORY_WB);
 344 }
 345
 346 /*
 347  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 348  * descriptor that has memory that is available for uncached allocator.
 349  */
 350 void
 351 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 352 {
 353         walk(callback, arg, EFI_MEMORY_UC);
 354 }
 355
 356 /*
 357  * Look for the PAL_CODE region reported by EFI and map it using an
 358  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 359  * Abstraction Layer chapter 11 in ADAG
 360  */
 361 void *
 362 efi_get_pal_addr (void)
 363 {
 364         void *efi_map_start, *efi_map_end, *p;
 365         efi_memory_desc_t *md;
 366         u64 efi_desc_size;
 367         int pal_code_count = 0;
 368         u64 vaddr, mask;
 369
 370         efi_map_start = __va(ia64_boot_param->efi_memmap);
 371         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 372         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 373
 374         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 375                 md = p;
 376                 if (md->type != EFI_PAL_CODE)
 377                         continue;
 378
 379                 if (++pal_code_count > 1) {
 380                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 381                                "dropped @ %llx\n", md->phys_addr);
 382                         continue;
 383                 }
 384                 /*
 385                  * The only ITLB entry in region 7 that is used is the one
 386                  * installed by __start().  That entry covers a 64MB range.
 387                  */
 388                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 389                 vaddr = PAGE_OFFSET + md->phys_addr;
 390
 391                 /*
 392                  * We must check that the PAL mapping won't overlap with the
 393                  * kernel mapping.
 394                  *
 395                  * PAL code is guaranteed to be aligned on a power of 2 between
 396                  * 4k and 256KB and that only one ITR is needed to map it. This
 397                  * implies that the PAL code is always aligned on its size,
 398                  * i.e., the closest matching page size supported by the TLB.
 399                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 400                  * it is bigger than 64MB (very unlikely!).  So for now the
 401                  * following test is enough to determine whether or not we need
 402                  * a dedicated ITR for the PAL code.
 403                  */
 404                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 405                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 406                                __func__);
 407                         continue;
 408                 }
 409
 410                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 411                         panic("Whoa!  PAL code size bigger than a granule!");
 412
 413 #if EFI_DEBUG
 414                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 415
 416                 printk(KERN_INFO "CPU %d: mapping PAL code "
 417                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 418                        smp_processor_id(), md->phys_addr,
 419                        md->phys_addr + efi_md_size(md),
 420                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 421 #endif
 422                 return __va(md->phys_addr);
 423         }
 424         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 425                __func__);
 426         return NULL;
 427 }
 428
 429
 430 static u8 __init palo_checksum(u8 *buffer, u32 length)
 431 {
 432         u8 sum = 0;
 433         u8 *end = buffer + length;
 434
 435         while (buffer < end)
 436                 sum = (u8) (sum + *(buffer++));
 437
 438         return sum;
 439 }
 440
 441 /*
 442  * Parse and handle PALO table which is published at:
 443  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 444  */
 445 static void __init handle_palo(unsigned long phys_addr)
 446 {
 447         struct palo_table *palo = __va(phys_addr);
 448         u8  checksum;
 449
 450         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 451                 printk(KERN_INFO "PALO signature incorrect.\n");
 452                 return;
 453         }
 454
 455         checksum = palo_checksum((u8 *)palo, palo->length);
 456         if (checksum) {
 457                 printk(KERN_INFO "PALO checksum incorrect.\n");
 458                 return;
 459         }
 460
 461         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 462 }
 463
 464 void
 465 efi_map_pal_code (void)
 466 {
 467         void *pal_vaddr = efi_get_pal_addr ();
 468         u64 psr;
 469
 470         if (!pal_vaddr)
 471                 return;
 472
 473         /*
 474          * Cannot write to CRx with PSR.ic=1
 475          */
 476         psr = ia64_clear_ic();
 477         ia64_itr(0x1, IA64_TR_PALCODE,
 478                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 479                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 480                  IA64_GRANULE_SHIFT);
 481         ia64_set_psr(psr);              /* restore psr */
 482 }
 483
 484 void __init
 485 efi_init (void)
 486 {
 487         const efi_system_table_t *efi_systab;
 488         void *efi_map_start, *efi_map_end;
 489         u64 efi_desc_size;
 490         char *cp;
 491
 492         set_bit(EFI_BOOT, &efi.flags);
 493         set_bit(EFI_64BIT, &efi.flags);
 494
 495         /*
 496          * It's too early to be able to use the standard kernel command line
 497          * support...
 498          */
 499         for (cp = boot_command_line; *cp; ) {
 500                 if (memcmp(cp, "mem=", 4) == 0) {
 501                         mem_limit = memparse(cp + 4, &cp);
 502                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 503                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 504                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 505                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 506                 } else {
 507                         while (*cp != ' ' && *cp)
 508                                 ++cp;
 509                         while (*cp == ' ')
 510                                 ++cp;
 511                 }
 512         }
 513         if (min_addr != 0UL)
 514                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 515                        min_addr >> 20);
 516         if (max_addr != ~0UL)
 517                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 518                        max_addr >> 20);
 519
 520         efi_systab = __va(ia64_boot_param->efi_systab);
 521
 522         /*
 523          * Verify the EFI Table
 524          */
 525         if (efi_systab == NULL)
 526                 panic("Whoa! Can't find EFI system table.\n");
 527         if (efi_systab_check_header(&efi_systab->hdr, 1))
 528                 panic("Whoa! EFI system table signature incorrect\n");
 529
 530         efi_systab_report_header(&efi_systab->hdr, efi_systab->fw_vendor);
 531
 532         palo_phys      = EFI_INVALID_TABLE_ADDR;
 533
 534         if (efi_config_parse_tables(__va(efi_systab->tables),
 535                                     efi_systab->nr_tables,
 536                                     arch_tables) != 0)
 537                 return;
 538
 539         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 540                 handle_palo(palo_phys);
 541
 542         runtime = __va(efi_systab->runtime);
 543         efi.get_time = phys_get_time;
 544         efi.set_time = phys_set_time;
 545         efi.get_wakeup_time = phys_get_wakeup_time;
 546         efi.set_wakeup_time = phys_set_wakeup_time;
 547         efi.get_variable = phys_get_variable;
 548         efi.get_next_variable = phys_get_next_variable;
 549         efi.set_variable = phys_set_variable;
 550         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 551         efi.reset_system = phys_reset_system;
 552
 553         efi_map_start = __va(ia64_boot_param->efi_memmap);
 554         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 555         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 556
 557 #if EFI_DEBUG
 558         /* print EFI memory map: */
 559         {
 560                 efi_memory_desc_t *md;
 561                 void *p;
 562
 563                 for (i = 0, p = efi_map_start; p < efi_map_end;
 564                      ++i, p += efi_desc_size)
 565                 {
 566                         const char *unit;
 567                         unsigned long size;
 568                         char buf[64];
 569
 570                         md = p;
 571                         size = md->num_pages << EFI_PAGE_SHIFT;
 572
 573                         if ((size >> 40) > 0) {
 574                                 size >>= 40;
 575                                 unit = "TB";
 576                         } else if ((size >> 30) > 0) {
 577                                 size >>= 30;
 578                                 unit = "GB";
 579                         } else if ((size >> 20) > 0) {
 580                                 size >>= 20;
 581                                 unit = "MB";
 582                         } else {
 583                                 size >>= 10;
 584                                 unit = "KB";
 585                         }
 586
 587                         printk("mem%02d: %s "
 588                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 589                                i, efi_md_typeattr_format(buf, sizeof(buf), md),
 590                                md->phys_addr,
 591                                md->phys_addr + efi_md_size(md), size, unit);
 592                 }
 593         }
 594 #endif
 595
 596         efi_map_pal_code();
 597         efi_enter_virtual_mode();
 598 }
 599
 600 void
 601 efi_enter_virtual_mode (void)
 602 {
 603         void *efi_map_start, *efi_map_end, *p;
 604         efi_memory_desc_t *md;
 605         efi_status_t status;
 606         u64 efi_desc_size;
 607
 608         efi_map_start = __va(ia64_boot_param->efi_memmap);
 609         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 610         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 611
 612         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 613                 md = p;
 614                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 615                         /*
 616                          * Some descriptors have multiple bits set, so the
 617                          * order of the tests is relevant.
 618                          */
 619                         if (md->attribute & EFI_MEMORY_WB) {
 620                                 md->virt_addr = (u64) __va(md->phys_addr);
 621                         } else if (md->attribute & EFI_MEMORY_UC) {
 622                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 623                         } else if (md->attribute & EFI_MEMORY_WC) {
 624 #if 0
 625                                 md->virt_addr = ia64_remap(md->phys_addr,
 626                                                            (_PAGE_A |
 627                                                             _PAGE_P |
 628                                                             _PAGE_D |
 629                                                             _PAGE_MA_WC |
 630                                                             _PAGE_PL_0 |
 631                                                             _PAGE_AR_RW));
 632 #else
 633                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 634                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 635 #endif
 636                         } else if (md->attribute & EFI_MEMORY_WT) {
 637 #if 0
 638                                 md->virt_addr = ia64_remap(md->phys_addr,
 639                                                            (_PAGE_A |
 640                                                             _PAGE_P |
 641                                                             _PAGE_D |
 642                                                             _PAGE_MA_WT |
 643                                                             _PAGE_PL_0 |
 644                                                             _PAGE_AR_RW));
 645 #else
 646                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 647                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 648 #endif
 649                         }
 650                 }
 651         }
 652
 653         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 654                                ia64_boot_param->efi_memmap_size,
 655                                efi_desc_size,
 656                                ia64_boot_param->efi_memdesc_version,
 657                                ia64_boot_param->efi_memmap);
 658         if (status != EFI_SUCCESS) {
 659                 printk(KERN_WARNING "warning: unable to switch EFI into "
 660                        "virtual mode (status=%lu)\n", status);
 661                 return;
 662         }
 663
 664         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 665
 666         /*
 667          * Now that EFI is in virtual mode, we call the EFI functions more
 668          * efficiently:
 669          */
 670         efi.get_time = virt_get_time;
 671         efi.set_time = virt_set_time;
 672         efi.get_wakeup_time = virt_get_wakeup_time;
 673         efi.set_wakeup_time = virt_set_wakeup_time;
 674         efi.get_variable = virt_get_variable;
 675         efi.get_next_variable = virt_get_next_variable;
 676         efi.set_variable = virt_set_variable;
 677         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 678         efi.reset_system = virt_reset_system;
 679 }
 680
 681 /*
 682  * Walk the EFI memory map looking for the I/O port range.  There can only be
 683  * one entry of this type, other I/O port ranges should be described via ACPI.
 684  */
 685 u64
 686 efi_get_iobase (void)
 687 {
 688         void *efi_map_start, *efi_map_end, *p;
 689         efi_memory_desc_t *md;
 690         u64 efi_desc_size;
 691
 692         efi_map_start = __va(ia64_boot_param->efi_memmap);
 693         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 694         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 695
 696         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 697                 md = p;
 698                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 699                         if (md->attribute & EFI_MEMORY_UC)
 700                                 return md->phys_addr;
 701                 }
 702         }
 703         return 0;
 704 }
 705
 706 static struct kern_memdesc *
 707 kern_memory_descriptor (unsigned long phys_addr)
 708 {
 709         struct kern_memdesc *md;
 710
 711         for (md = kern_memmap; md->start != ~0UL; md++) {
 712                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 713                          return md;
 714         }
 715         return NULL;
 716 }
 717
 718 static efi_memory_desc_t *
 719 efi_memory_descriptor (unsigned long phys_addr)
 720 {
 721         void *efi_map_start, *efi_map_end, *p;
 722         efi_memory_desc_t *md;
 723         u64 efi_desc_size;
 724
 725         efi_map_start = __va(ia64_boot_param->efi_memmap);
 726         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 727         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 728
 729         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 730                 md = p;
 731
 732                 if (phys_addr - md->phys_addr < efi_md_size(md))
 733                          return md;
 734         }
 735         return NULL;
 736 }
 737
 738 static int
 739 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 740 {
 741         void *efi_map_start, *efi_map_end, *p;
 742         efi_memory_desc_t *md;
 743         u64 efi_desc_size;
 744         unsigned long end;
 745
 746         efi_map_start = __va(ia64_boot_param->efi_memmap);
 747         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 748         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 749
 750         end = phys_addr + size;
 751
 752         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 753                 md = p;
 754                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 755                         return 1;
 756         }
 757         return 0;
 758 }
 759
 760 int
 761 efi_mem_type (unsigned long phys_addr)
 762 {
 763         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 764
 765         if (md)
 766                 return md->type;
 767         return -EINVAL;
 768 }
 769
 770 u64
 771 efi_mem_attributes (unsigned long phys_addr)
 772 {
 773         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 774
 775         if (md)
 776                 return md->attribute;
 777         return 0;
 778 }
 779 EXPORT_SYMBOL(efi_mem_attributes);
 780
 781 u64
 782 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 783 {
 784         unsigned long end = phys_addr + size;
 785         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 786         u64 attr;
 787
 788         if (!md)
 789                 return 0;
 790
 791         /*
 792          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 793          * the kernel that firmware needs this region mapped.
 794          */
 795         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 796         do {
 797                 unsigned long md_end = efi_md_end(md);
 798
 799                 if (end <= md_end)
 800                         return attr;
 801
 802                 md = efi_memory_descriptor(md_end);
 803                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 804                         return 0;
 805         } while (md);
 806         return 0;       /* never reached */
 807 }
 808
 809 u64
 810 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 811 {
 812         unsigned long end = phys_addr + size;
 813         struct kern_memdesc *md;
 814         u64 attr;
 815
 816         /*
 817          * This is a hack for ioremap calls before we set up kern_memmap.
 818          * Maybe we should do efi_memmap_init() earlier instead.
 819          */
 820         if (!kern_memmap) {
 821                 attr = efi_mem_attribute(phys_addr, size);
 822                 if (attr & EFI_MEMORY_WB)
 823                         return EFI_MEMORY_WB;
 824                 return 0;
 825         }
 826
 827         md = kern_memory_descriptor(phys_addr);
 828         if (!md)
 829                 return 0;
 830
 831         attr = md->attribute;
 832         do {
 833                 unsigned long md_end = kmd_end(md);
 834
 835                 if (end <= md_end)
 836                         return attr;
 837
 838                 md = kern_memory_descriptor(md_end);
 839                 if (!md || md->attribute != attr)
 840                         return 0;
 841         } while (md);
 842         return 0;       /* never reached */
 843 }
 844
 845 int
 846 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
 847 {
 848         u64 attr;
 849
 850         /*
 851          * /dev/mem reads and writes use copy_to_user(), which implicitly
 852          * uses a granule-sized kernel identity mapping.  It's really
 853          * only safe to do this for regions in kern_memmap.  For more
 854          * details, see Documentation/ia64/aliasing.rst.
 855          */
 856         attr = kern_mem_attribute(phys_addr, size);
 857         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 858                 return 1;
 859         return 0;
 860 }
 861
 862 int
 863 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 864 {
 865         unsigned long phys_addr = pfn << PAGE_SHIFT;
 866         u64 attr;
 867
 868         attr = efi_mem_attribute(phys_addr, size);
 869
 870         /*
 871          * /dev/mem mmap uses normal user pages, so we don't need the entire
 872          * granule, but the entire region we're mapping must support the same
 873          * attribute.
 874          */
 875         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 876                 return 1;
 877
 878         /*
 879          * Intel firmware doesn't tell us about all the MMIO regions, so
 880          * in general we have to allow mmap requests.  But if EFI *does*
 881          * tell us about anything inside this region, we should deny it.
 882          * The user can always map a smaller region to avoid the overlap.
 883          */
 884         if (efi_memmap_intersects(phys_addr, size))
 885                 return 0;
 886
 887         return 1;
 888 }
 889
 890 pgprot_t
 891 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 892                      pgprot_t vma_prot)
 893 {
 894         unsigned long phys_addr = pfn << PAGE_SHIFT;
 895         u64 attr;
 896
 897         /*
 898          * For /dev/mem mmap, we use user mappings, but if the region is
 899          * in kern_memmap (and hence may be covered by a kernel mapping),
 900          * we must use the same attribute as the kernel mapping.
 901          */
 902         attr = kern_mem_attribute(phys_addr, size);
 903         if (attr & EFI_MEMORY_WB)
 904                 return pgprot_cacheable(vma_prot);
 905         else if (attr & EFI_MEMORY_UC)
 906                 return pgprot_noncached(vma_prot);
 907
 908         /*
 909          * Some chipsets don't support UC access to memory.  If
 910          * WB is supported, we prefer that.
 911          */
 912         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 913                 return pgprot_cacheable(vma_prot);
 914
 915         return pgprot_noncached(vma_prot);
 916 }
 917
 918 int __init
 919 efi_uart_console_only(void)
 920 {
 921         efi_status_t status;
 922         char *s, name[] = "ConOut";
 923         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 924         efi_char16_t *utf16, name_utf16[32];
 925         unsigned char data[1024];
 926         unsigned long size = sizeof(data);
 927         struct efi_generic_dev_path *hdr, *end_addr;
 928         int uart = 0;
 929
 930         /* Convert to UTF-16 */
 931         utf16 = name_utf16;
 932         s = name;
 933         while (*s)
 934                 *utf16++ = *s++ & 0x7f;
 935         *utf16 = 0;
 936
 937         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 938         if (status != EFI_SUCCESS) {
 939                 printk(KERN_ERR "No EFI %s variable?\n", name);
 940                 return 0;
 941         }
 942
 943         hdr = (struct efi_generic_dev_path *) data;
 944         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 945         while (hdr < end_addr) {
 946                 if (hdr->type == EFI_DEV_MSG &&
 947                     hdr->sub_type == EFI_DEV_MSG_UART)
 948                         uart = 1;
 949                 else if (hdr->type == EFI_DEV_END_PATH ||
 950                           hdr->type == EFI_DEV_END_PATH2) {
 951                         if (!uart)
 952                                 return 0;
 953                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 954                                 return 1;
 955                         uart = 0;
 956                 }
 957                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 958         }
 959         printk(KERN_ERR "Malformed %s value\n", name);
 960         return 0;
 961 }
 962
 963 /*
 964  * Look for the first granule aligned memory descriptor memory
 965  * that is big enough to hold EFI memory map. Make sure this
 966  * descriptor is at least granule sized so it does not get trimmed
 967  */
 968 struct kern_memdesc *
 969 find_memmap_space (void)
 970 {
 971         u64     contig_low=0, contig_high=0;
 972         u64     as = 0, ae;
 973         void *efi_map_start, *efi_map_end, *p, *q;
 974         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 975         u64     space_needed, efi_desc_size;
 976         unsigned long total_mem = 0;
 977
 978         efi_map_start = __va(ia64_boot_param->efi_memmap);
 979         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 980         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 981
 982         /*
 983          * Worst case: we need 3 kernel descriptors for each efi descriptor
 984          * (if every entry has a WB part in the middle, and UC head and tail),
 985          * plus one for the end marker.
 986          */
 987         space_needed = sizeof(kern_memdesc_t) *
 988                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 989
 990         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 991                 md = p;
 992                 if (!efi_wb(md)) {
 993                         continue;
 994                 }
 995                 if (pmd == NULL || !efi_wb(pmd) ||
 996                     efi_md_end(pmd) != md->phys_addr) {
 997                         contig_low = GRANULEROUNDUP(md->phys_addr);
 998                         contig_high = efi_md_end(md);
 999                         for (q = p + efi_desc_size; q < efi_map_end;
1000                              q += efi_desc_size) {
1001                                 check_md = q;
1002                                 if (!efi_wb(check_md))
1003                                         break;
1004                                 if (contig_high != check_md->phys_addr)
1005                                         break;
1006                                 contig_high = efi_md_end(check_md);
1007                         }
1008                         contig_high = GRANULEROUNDDOWN(contig_high);
1009                 }
1010                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1011                         continue;
1012
1013                 /* Round ends inward to granule boundaries */
1014                 as = max(contig_low, md->phys_addr);
1015                 ae = min(contig_high, efi_md_end(md));
1016
1017                 /* keep within max_addr= and min_addr= command line arg */
1018                 as = max(as, min_addr);
1019                 ae = min(ae, max_addr);
1020                 if (ae <= as)
1021                         continue;
1022
1023                 /* avoid going over mem= command line arg */
1024                 if (total_mem + (ae - as) > mem_limit)
1025                         ae -= total_mem + (ae - as) - mem_limit;
1026
1027                 if (ae <= as)
1028                         continue;
1029
1030                 if (ae - as > space_needed)
1031                         break;
1032         }
1033         if (p >= efi_map_end)
1034                 panic("Can't allocate space for kernel memory descriptors");
1035
1036         return __va(as);
1037 }
1038
1039 /*
1040  * Walk the EFI memory map and gather all memory available for kernel
1041  * to use.  We can allocate partial granules only if the unavailable
1042  * parts exist, and are WB.
1043  */
1044 unsigned long
1045 efi_memmap_init(u64 *s, u64 *e)
1046 {
1047         struct kern_memdesc *k, *prev = NULL;
1048         u64     contig_low=0, contig_high=0;
1049         u64     as, ae, lim;
1050         void *efi_map_start, *efi_map_end, *p, *q;
1051         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1052         u64     efi_desc_size;
1053         unsigned long total_mem = 0;
1054
1055         k = kern_memmap = find_memmap_space();
1056
1057         efi_map_start = __va(ia64_boot_param->efi_memmap);
1058         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1059         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1060
1061         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1062                 md = p;
1063                 if (!efi_wb(md)) {
1064                         if (efi_uc(md) &&
1065                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1066                              md->type == EFI_BOOT_SERVICES_DATA)) {
1067                                 k->attribute = EFI_MEMORY_UC;
1068                                 k->start = md->phys_addr;
1069                                 k->num_pages = md->num_pages;
1070                                 k++;
1071                         }
1072                         continue;
1073                 }
1074                 if (pmd == NULL || !efi_wb(pmd) ||
1075                     efi_md_end(pmd) != md->phys_addr) {
1076                         contig_low = GRANULEROUNDUP(md->phys_addr);
1077                         contig_high = efi_md_end(md);
1078                         for (q = p + efi_desc_size; q < efi_map_end;
1079                              q += efi_desc_size) {
1080                                 check_md = q;
1081                                 if (!efi_wb(check_md))
1082                                         break;
1083                                 if (contig_high != check_md->phys_addr)
1084                                         break;
1085                                 contig_high = efi_md_end(check_md);
1086                         }
1087                         contig_high = GRANULEROUNDDOWN(contig_high);
1088                 }
1089                 if (!is_memory_available(md))
1090                         continue;
1091
1092                 /*
1093                  * Round ends inward to granule boundaries
1094                  * Give trimmings to uncached allocator
1095                  */
1096                 if (md->phys_addr < contig_low) {
1097                         lim = min(efi_md_end(md), contig_low);
1098                         if (efi_uc(md)) {
1099                                 if (k > kern_memmap &&
1100                                     (k-1)->attribute == EFI_MEMORY_UC &&
1101                                     kmd_end(k-1) == md->phys_addr) {
1102                                         (k-1)->num_pages +=
1103                                                 (lim - md->phys_addr)
1104                                                 >> EFI_PAGE_SHIFT;
1105                                 } else {
1106                                         k->attribute = EFI_MEMORY_UC;
1107                                         k->start = md->phys_addr;
1108                                         k->num_pages = (lim - md->phys_addr)
1109                                                 >> EFI_PAGE_SHIFT;
1110                                         k++;
1111                                 }
1112                         }
1113                         as = contig_low;
1114                 } else
1115                         as = md->phys_addr;
1116
1117                 if (efi_md_end(md) > contig_high) {
1118                         lim = max(md->phys_addr, contig_high);
1119                         if (efi_uc(md)) {
1120                                 if (lim == md->phys_addr && k > kern_memmap &&
1121                                     (k-1)->attribute == EFI_MEMORY_UC &&
1122                                     kmd_end(k-1) == md->phys_addr) {
1123                                         (k-1)->num_pages += md->num_pages;
1124                                 } else {
1125                                         k->attribute = EFI_MEMORY_UC;
1126                                         k->start = lim;
1127                                         k->num_pages = (efi_md_end(md) - lim)
1128                                                 >> EFI_PAGE_SHIFT;
1129                                         k++;
1130                                 }
1131                         }
1132                         ae = contig_high;
1133                 } else
1134                         ae = efi_md_end(md);
1135
1136                 /* keep within max_addr= and min_addr= command line arg */
1137                 as = max(as, min_addr);
1138                 ae = min(ae, max_addr);
1139                 if (ae <= as)
1140                         continue;
1141
1142                 /* avoid going over mem= command line arg */
1143                 if (total_mem + (ae - as) > mem_limit)
1144                         ae -= total_mem + (ae - as) - mem_limit;
1145
1146                 if (ae <= as)
1147                         continue;
1148                 if (prev && kmd_end(prev) == md->phys_addr) {
1149                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1150                         total_mem += ae - as;
1151                         continue;
1152                 }
1153                 k->attribute = EFI_MEMORY_WB;
1154                 k->start = as;
1155                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1156                 total_mem += ae - as;
1157                 prev = k++;
1158         }
1159         k->start = ~0L; /* end-marker */
1160
1161         /* reserve the memory we are using for kern_memmap */
1162         *s = (u64)kern_memmap;
1163         *e = (u64)++k;
1164
1165         return total_mem;
1166 }
1167
1168 void
1169 efi_initialize_iomem_resources(struct resource *code_resource,
1170                                struct resource *data_resource,
1171                                struct resource *bss_resource)
1172 {
1173         struct resource *res;
1174         void *efi_map_start, *efi_map_end, *p;
1175         efi_memory_desc_t *md;
1176         u64 efi_desc_size;
1177         char *name;
1178         unsigned long flags, desc;
1179
1180         efi_map_start = __va(ia64_boot_param->efi_memmap);
1181         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1182         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1183
1184         res = NULL;
1185
1186         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1187                 md = p;
1188
1189                 if (md->num_pages == 0) /* should not happen */
1190                         continue;
1191
1192                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1193                 desc = IORES_DESC_NONE;
1194
1195                 switch (md->type) {
1196
1197                         case EFI_MEMORY_MAPPED_IO:
1198                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1199                                 continue;
1200
1201                         case EFI_LOADER_CODE:
1202                         case EFI_LOADER_DATA:
1203                         case EFI_BOOT_SERVICES_DATA:
1204                         case EFI_BOOT_SERVICES_CODE:
1205                         case EFI_CONVENTIONAL_MEMORY:
1206                                 if (md->attribute & EFI_MEMORY_WP) {
1207                                         name = "System ROM";
1208                                         flags |= IORESOURCE_READONLY;
1209                                 } else if (md->attribute == EFI_MEMORY_UC) {
1210                                         name = "Uncached RAM";
1211                                 } else {
1212                                         name = "System RAM";
1213                                         flags |= IORESOURCE_SYSRAM;
1214                                 }
1215                                 break;
1216
1217                         case EFI_ACPI_MEMORY_NVS:
1218                                 name = "ACPI Non-volatile Storage";
1219                                 desc = IORES_DESC_ACPI_NV_STORAGE;
1220                                 break;
1221
1222                         case EFI_UNUSABLE_MEMORY:
1223                                 name = "reserved";
1224                                 flags |= IORESOURCE_DISABLED;
1225                                 break;
1226
1227                         case EFI_PERSISTENT_MEMORY:
1228                                 name = "Persistent Memory";
1229                                 desc = IORES_DESC_PERSISTENT_MEMORY;
1230                                 break;
1231
1232                         case EFI_RESERVED_TYPE:
1233                         case EFI_RUNTIME_SERVICES_CODE:
1234                         case EFI_RUNTIME_SERVICES_DATA:
1235                         case EFI_ACPI_RECLAIM_MEMORY:
1236                         default:
1237                                 name = "reserved";
1238                                 break;
1239                 }
1240
1241                 if ((res = kzalloc(sizeof(struct resource),
1242                                    GFP_KERNEL)) == NULL) {
1243                         printk(KERN_ERR
1244                                "failed to allocate resource for iomem\n");
1245                         return;
1246                 }
1247
1248                 res->name = name;
1249                 res->start = md->phys_addr;
1250                 res->end = md->phys_addr + efi_md_size(md) - 1;
1251                 res->flags = flags;
1252                 res->desc = desc;
1253
1254                 if (insert_resource(&iomem_resource, res) < 0)
1255                         kfree(res);
1256                 else {
1257                         /*
1258                          * We don't know which region contains
1259                          * kernel data so we try it repeatedly and
1260                          * let the resource manager test it.
1261                          */
1262                         insert_resource(res, code_resource);
1263                         insert_resource(res, data_resource);
1264                         insert_resource(res, bss_resource);
1265 #ifdef CONFIG_KEXEC
1266                         insert_resource(res, &efi_memmap_res);
1267                         insert_resource(res, &boot_param_res);
1268                         if (crashk_res.end > crashk_res.start)
1269                                 insert_resource(res, &crashk_res);
1270 #endif
1271                 }
1272         }
1273 }
1274
1275 #ifdef CONFIG_KEXEC
1276 /* find a block of memory aligned to 64M exclude reserved regions
1277    rsvd_regions are sorted
1278  */
1279 unsigned long __init
1280 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1281 {
1282         int i;
1283         u64 start, end;
1284         u64 alignment = 1UL << _PAGE_SIZE_64M;
1285         void *efi_map_start, *efi_map_end, *p;
1286         efi_memory_desc_t *md;
1287         u64 efi_desc_size;
1288
1289         efi_map_start = __va(ia64_boot_param->efi_memmap);
1290         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1291         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1292
1293         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1294                 md = p;
1295                 if (!efi_wb(md))
1296                         continue;
1297                 start = ALIGN(md->phys_addr, alignment);
1298                 end = efi_md_end(md);
1299                 for (i = 0; i < n; i++) {
1300                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1301                                 if (__pa(r[i].start) > start + size)
1302                                         return start;
1303                                 start = ALIGN(__pa(r[i].end), alignment);
1304                                 if (i < n-1 &&
1305                                     __pa(r[i+1].start) < start + size)
1306                                         continue;
1307                                 else
1308                                         break;
1309                         }
1310                 }
1311                 if (end > start + size)
1312                         return start;
1313         }
1314
1315         printk(KERN_WARNING
1316                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1317         return ~0UL;
1318 }
1319 #endif
1320
1321 #ifdef CONFIG_CRASH_DUMP
1322 /* locate the size find a the descriptor at a certain address */
1323 unsigned long __init
1324 vmcore_find_descriptor_size (unsigned long address)
1325 {
1326         void *efi_map_start, *efi_map_end, *p;
1327         efi_memory_desc_t *md;
1328         u64 efi_desc_size;
1329         unsigned long ret = 0;
1330
1331         efi_map_start = __va(ia64_boot_param->efi_memmap);
1332         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1333         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1334
1335         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1336                 md = p;
1337                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1338                     && md->phys_addr == address) {
1339                         ret = efi_md_size(md);
1340                         break;
1341                 }
1342         }
1343
1344         if (ret == 0)
1345                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1346
1347         return ret;
1348 }
1349 #endif
1350
1351 char *efi_systab_show_arch(char *str)
1352 {
1353         if (mps_phys != EFI_INVALID_TABLE_ADDR)
1354                 str += sprintf(str, "MPS=0x%lx\n", mps_phys);
1355         if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
1356                 str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);
1357         return str;
1358 }