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/pgtable.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 __initdata efi_config_table_type_t arch_tables[] = {
  60         {ESI_TABLE_GUID, "ESI", &esi_phys},
  61         {HCDP_TABLE_GUID, "HCDP", &hcdp_phys},
  62         {MPS_TABLE_GUID, "MPS", &mps_phys},
  63         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
  64         {SAL_SYSTEM_TABLE_GUID, "SALsystab", &sal_systab_phys},
  65         {NULL_GUID, NULL, 0},
  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         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_init(arch_tables) != 0)
 534                 return;
 535
 536         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 537                 handle_palo(palo_phys);
 538
 539         runtime = __va(efi.systab->runtime);
 540         efi.get_time = phys_get_time;
 541         efi.set_time = phys_set_time;
 542         efi.get_wakeup_time = phys_get_wakeup_time;
 543         efi.set_wakeup_time = phys_set_wakeup_time;
 544         efi.get_variable = phys_get_variable;
 545         efi.get_next_variable = phys_get_next_variable;
 546         efi.set_variable = phys_set_variable;
 547         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 548         efi.reset_system = phys_reset_system;
 549
 550         efi_map_start = __va(ia64_boot_param->efi_memmap);
 551         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 552         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 553
 554 #if EFI_DEBUG
 555         /* print EFI memory map: */
 556         {
 557                 efi_memory_desc_t *md;
 558                 void *p;
 559
 560                 for (i = 0, p = efi_map_start; p < efi_map_end;
 561                      ++i, p += efi_desc_size)
 562                 {
 563                         const char *unit;
 564                         unsigned long size;
 565                         char buf[64];
 566
 567                         md = p;
 568                         size = md->num_pages << EFI_PAGE_SHIFT;
 569
 570                         if ((size >> 40) > 0) {
 571                                 size >>= 40;
 572                                 unit = "TB";
 573                         } else if ((size >> 30) > 0) {
 574                                 size >>= 30;
 575                                 unit = "GB";
 576                         } else if ((size >> 20) > 0) {
 577                                 size >>= 20;
 578                                 unit = "MB";
 579                         } else {
 580                                 size >>= 10;
 581                                 unit = "KB";
 582                         }
 583
 584                         printk("mem%02d: %s "
 585                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 586                                i, efi_md_typeattr_format(buf, sizeof(buf), md),
 587                                md->phys_addr,
 588                                md->phys_addr + efi_md_size(md), size, unit);
 589                 }
 590         }
 591 #endif
 592
 593         efi_map_pal_code();
 594         efi_enter_virtual_mode();
 595 }
 596
 597 void
 598 efi_enter_virtual_mode (void)
 599 {
 600         void *efi_map_start, *efi_map_end, *p;
 601         efi_memory_desc_t *md;
 602         efi_status_t status;
 603         u64 efi_desc_size;
 604
 605         efi_map_start = __va(ia64_boot_param->efi_memmap);
 606         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 607         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 608
 609         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 610                 md = p;
 611                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 612                         /*
 613                          * Some descriptors have multiple bits set, so the
 614                          * order of the tests is relevant.
 615                          */
 616                         if (md->attribute & EFI_MEMORY_WB) {
 617                                 md->virt_addr = (u64) __va(md->phys_addr);
 618                         } else if (md->attribute & EFI_MEMORY_UC) {
 619                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 620                         } else if (md->attribute & EFI_MEMORY_WC) {
 621 #if 0
 622                                 md->virt_addr = ia64_remap(md->phys_addr,
 623                                                            (_PAGE_A |
 624                                                             _PAGE_P |
 625                                                             _PAGE_D |
 626                                                             _PAGE_MA_WC |
 627                                                             _PAGE_PL_0 |
 628                                                             _PAGE_AR_RW));
 629 #else
 630                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 631                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 632 #endif
 633                         } else if (md->attribute & EFI_MEMORY_WT) {
 634 #if 0
 635                                 md->virt_addr = ia64_remap(md->phys_addr,
 636                                                            (_PAGE_A |
 637                                                             _PAGE_P |
 638                                                             _PAGE_D |
 639                                                             _PAGE_MA_WT |
 640                                                             _PAGE_PL_0 |
 641                                                             _PAGE_AR_RW));
 642 #else
 643                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 644                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 645 #endif
 646                         }
 647                 }
 648         }
 649
 650         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 651                                ia64_boot_param->efi_memmap_size,
 652                                efi_desc_size,
 653                                ia64_boot_param->efi_memdesc_version,
 654                                ia64_boot_param->efi_memmap);
 655         if (status != EFI_SUCCESS) {
 656                 printk(KERN_WARNING "warning: unable to switch EFI into "
 657                        "virtual mode (status=%lu)\n", status);
 658                 return;
 659         }
 660
 661         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 662
 663         /*
 664          * Now that EFI is in virtual mode, we call the EFI functions more
 665          * efficiently:
 666          */
 667         efi.get_time = virt_get_time;
 668         efi.set_time = virt_set_time;
 669         efi.get_wakeup_time = virt_get_wakeup_time;
 670         efi.set_wakeup_time = virt_set_wakeup_time;
 671         efi.get_variable = virt_get_variable;
 672         efi.get_next_variable = virt_get_next_variable;
 673         efi.set_variable = virt_set_variable;
 674         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 675         efi.reset_system = virt_reset_system;
 676 }
 677
 678 /*
 679  * Walk the EFI memory map looking for the I/O port range.  There can only be
 680  * one entry of this type, other I/O port ranges should be described via ACPI.
 681  */
 682 u64
 683 efi_get_iobase (void)
 684 {
 685         void *efi_map_start, *efi_map_end, *p;
 686         efi_memory_desc_t *md;
 687         u64 efi_desc_size;
 688
 689         efi_map_start = __va(ia64_boot_param->efi_memmap);
 690         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 691         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 692
 693         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 694                 md = p;
 695                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 696                         if (md->attribute & EFI_MEMORY_UC)
 697                                 return md->phys_addr;
 698                 }
 699         }
 700         return 0;
 701 }
 702
 703 static struct kern_memdesc *
 704 kern_memory_descriptor (unsigned long phys_addr)
 705 {
 706         struct kern_memdesc *md;
 707
 708         for (md = kern_memmap; md->start != ~0UL; md++) {
 709                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 710                          return md;
 711         }
 712         return NULL;
 713 }
 714
 715 static efi_memory_desc_t *
 716 efi_memory_descriptor (unsigned long phys_addr)
 717 {
 718         void *efi_map_start, *efi_map_end, *p;
 719         efi_memory_desc_t *md;
 720         u64 efi_desc_size;
 721
 722         efi_map_start = __va(ia64_boot_param->efi_memmap);
 723         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 724         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 725
 726         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 727                 md = p;
 728
 729                 if (phys_addr - md->phys_addr < efi_md_size(md))
 730                          return md;
 731         }
 732         return NULL;
 733 }
 734
 735 static int
 736 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 737 {
 738         void *efi_map_start, *efi_map_end, *p;
 739         efi_memory_desc_t *md;
 740         u64 efi_desc_size;
 741         unsigned long end;
 742
 743         efi_map_start = __va(ia64_boot_param->efi_memmap);
 744         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 745         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 746
 747         end = phys_addr + size;
 748
 749         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 750                 md = p;
 751                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 752                         return 1;
 753         }
 754         return 0;
 755 }
 756
 757 int
 758 efi_mem_type (unsigned long phys_addr)
 759 {
 760         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 761
 762         if (md)
 763                 return md->type;
 764         return -EINVAL;
 765 }
 766
 767 u64
 768 efi_mem_attributes (unsigned long phys_addr)
 769 {
 770         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 771
 772         if (md)
 773                 return md->attribute;
 774         return 0;
 775 }
 776 EXPORT_SYMBOL(efi_mem_attributes);
 777
 778 u64
 779 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 780 {
 781         unsigned long end = phys_addr + size;
 782         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 783         u64 attr;
 784
 785         if (!md)
 786                 return 0;
 787
 788         /*
 789          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 790          * the kernel that firmware needs this region mapped.
 791          */
 792         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 793         do {
 794                 unsigned long md_end = efi_md_end(md);
 795
 796                 if (end <= md_end)
 797                         return attr;
 798
 799                 md = efi_memory_descriptor(md_end);
 800                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 801                         return 0;
 802         } while (md);
 803         return 0;       /* never reached */
 804 }
 805
 806 u64
 807 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 808 {
 809         unsigned long end = phys_addr + size;
 810         struct kern_memdesc *md;
 811         u64 attr;
 812
 813         /*
 814          * This is a hack for ioremap calls before we set up kern_memmap.
 815          * Maybe we should do efi_memmap_init() earlier instead.
 816          */
 817         if (!kern_memmap) {
 818                 attr = efi_mem_attribute(phys_addr, size);
 819                 if (attr & EFI_MEMORY_WB)
 820                         return EFI_MEMORY_WB;
 821                 return 0;
 822         }
 823
 824         md = kern_memory_descriptor(phys_addr);
 825         if (!md)
 826                 return 0;
 827
 828         attr = md->attribute;
 829         do {
 830                 unsigned long md_end = kmd_end(md);
 831
 832                 if (end <= md_end)
 833                         return attr;
 834
 835                 md = kern_memory_descriptor(md_end);
 836                 if (!md || md->attribute != attr)
 837                         return 0;
 838         } while (md);
 839         return 0;       /* never reached */
 840 }
 841
 842 int
 843 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
 844 {
 845         u64 attr;
 846
 847         /*
 848          * /dev/mem reads and writes use copy_to_user(), which implicitly
 849          * uses a granule-sized kernel identity mapping.  It's really
 850          * only safe to do this for regions in kern_memmap.  For more
 851          * details, see Documentation/ia64/aliasing.rst.
 852          */
 853         attr = kern_mem_attribute(phys_addr, size);
 854         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 855                 return 1;
 856         return 0;
 857 }
 858
 859 int
 860 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 861 {
 862         unsigned long phys_addr = pfn << PAGE_SHIFT;
 863         u64 attr;
 864
 865         attr = efi_mem_attribute(phys_addr, size);
 866
 867         /*
 868          * /dev/mem mmap uses normal user pages, so we don't need the entire
 869          * granule, but the entire region we're mapping must support the same
 870          * attribute.
 871          */
 872         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 873                 return 1;
 874
 875         /*
 876          * Intel firmware doesn't tell us about all the MMIO regions, so
 877          * in general we have to allow mmap requests.  But if EFI *does*
 878          * tell us about anything inside this region, we should deny it.
 879          * The user can always map a smaller region to avoid the overlap.
 880          */
 881         if (efi_memmap_intersects(phys_addr, size))
 882                 return 0;
 883
 884         return 1;
 885 }
 886
 887 pgprot_t
 888 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 889                      pgprot_t vma_prot)
 890 {
 891         unsigned long phys_addr = pfn << PAGE_SHIFT;
 892         u64 attr;
 893
 894         /*
 895          * For /dev/mem mmap, we use user mappings, but if the region is
 896          * in kern_memmap (and hence may be covered by a kernel mapping),
 897          * we must use the same attribute as the kernel mapping.
 898          */
 899         attr = kern_mem_attribute(phys_addr, size);
 900         if (attr & EFI_MEMORY_WB)
 901                 return pgprot_cacheable(vma_prot);
 902         else if (attr & EFI_MEMORY_UC)
 903                 return pgprot_noncached(vma_prot);
 904
 905         /*
 906          * Some chipsets don't support UC access to memory.  If
 907          * WB is supported, we prefer that.
 908          */
 909         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 910                 return pgprot_cacheable(vma_prot);
 911
 912         return pgprot_noncached(vma_prot);
 913 }
 914
 915 int __init
 916 efi_uart_console_only(void)
 917 {
 918         efi_status_t status;
 919         char *s, name[] = "ConOut";
 920         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 921         efi_char16_t *utf16, name_utf16[32];
 922         unsigned char data[1024];
 923         unsigned long size = sizeof(data);
 924         struct efi_generic_dev_path *hdr, *end_addr;
 925         int uart = 0;
 926
 927         /* Convert to UTF-16 */
 928         utf16 = name_utf16;
 929         s = name;
 930         while (*s)
 931                 *utf16++ = *s++ & 0x7f;
 932         *utf16 = 0;
 933
 934         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 935         if (status != EFI_SUCCESS) {
 936                 printk(KERN_ERR "No EFI %s variable?\n", name);
 937                 return 0;
 938         }
 939
 940         hdr = (struct efi_generic_dev_path *) data;
 941         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 942         while (hdr < end_addr) {
 943                 if (hdr->type == EFI_DEV_MSG &&
 944                     hdr->sub_type == EFI_DEV_MSG_UART)
 945                         uart = 1;
 946                 else if (hdr->type == EFI_DEV_END_PATH ||
 947                           hdr->type == EFI_DEV_END_PATH2) {
 948                         if (!uart)
 949                                 return 0;
 950                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 951                                 return 1;
 952                         uart = 0;
 953                 }
 954                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 955         }
 956         printk(KERN_ERR "Malformed %s value\n", name);
 957         return 0;
 958 }
 959
 960 /*
 961  * Look for the first granule aligned memory descriptor memory
 962  * that is big enough to hold EFI memory map. Make sure this
 963  * descriptor is at least granule sized so it does not get trimmed
 964  */
 965 struct kern_memdesc *
 966 find_memmap_space (void)
 967 {
 968         u64     contig_low=0, contig_high=0;
 969         u64     as = 0, ae;
 970         void *efi_map_start, *efi_map_end, *p, *q;
 971         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 972         u64     space_needed, efi_desc_size;
 973         unsigned long total_mem = 0;
 974
 975         efi_map_start = __va(ia64_boot_param->efi_memmap);
 976         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 977         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 978
 979         /*
 980          * Worst case: we need 3 kernel descriptors for each efi descriptor
 981          * (if every entry has a WB part in the middle, and UC head and tail),
 982          * plus one for the end marker.
 983          */
 984         space_needed = sizeof(kern_memdesc_t) *
 985                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 986
 987         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 988                 md = p;
 989                 if (!efi_wb(md)) {
 990                         continue;
 991                 }
 992                 if (pmd == NULL || !efi_wb(pmd) ||
 993                     efi_md_end(pmd) != md->phys_addr) {
 994                         contig_low = GRANULEROUNDUP(md->phys_addr);
 995                         contig_high = efi_md_end(md);
 996                         for (q = p + efi_desc_size; q < efi_map_end;
 997                              q += efi_desc_size) {
 998                                 check_md = q;
 999                                 if (!efi_wb(check_md))
1000                                         break;
1001                                 if (contig_high != check_md->phys_addr)
1002                                         break;
1003                                 contig_high = efi_md_end(check_md);
1004                         }
1005                         contig_high = GRANULEROUNDDOWN(contig_high);
1006                 }
1007                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1008                         continue;
1009
1010                 /* Round ends inward to granule boundaries */
1011                 as = max(contig_low, md->phys_addr);
1012                 ae = min(contig_high, efi_md_end(md));
1013
1014                 /* keep within max_addr= and min_addr= command line arg */
1015                 as = max(as, min_addr);
1016                 ae = min(ae, max_addr);
1017                 if (ae <= as)
1018                         continue;
1019
1020                 /* avoid going over mem= command line arg */
1021                 if (total_mem + (ae - as) > mem_limit)
1022                         ae -= total_mem + (ae - as) - mem_limit;
1023
1024                 if (ae <= as)
1025                         continue;
1026
1027                 if (ae - as > space_needed)
1028                         break;
1029         }
1030         if (p >= efi_map_end)
1031                 panic("Can't allocate space for kernel memory descriptors");
1032
1033         return __va(as);
1034 }
1035
1036 /*
1037  * Walk the EFI memory map and gather all memory available for kernel
1038  * to use.  We can allocate partial granules only if the unavailable
1039  * parts exist, and are WB.
1040  */
1041 unsigned long
1042 efi_memmap_init(u64 *s, u64 *e)
1043 {
1044         struct kern_memdesc *k, *prev = NULL;
1045         u64     contig_low=0, contig_high=0;
1046         u64     as, ae, lim;
1047         void *efi_map_start, *efi_map_end, *p, *q;
1048         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1049         u64     efi_desc_size;
1050         unsigned long total_mem = 0;
1051
1052         k = kern_memmap = find_memmap_space();
1053
1054         efi_map_start = __va(ia64_boot_param->efi_memmap);
1055         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1056         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1057
1058         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1059                 md = p;
1060                 if (!efi_wb(md)) {
1061                         if (efi_uc(md) &&
1062                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1063                              md->type == EFI_BOOT_SERVICES_DATA)) {
1064                                 k->attribute = EFI_MEMORY_UC;
1065                                 k->start = md->phys_addr;
1066                                 k->num_pages = md->num_pages;
1067                                 k++;
1068                         }
1069                         continue;
1070                 }
1071                 if (pmd == NULL || !efi_wb(pmd) ||
1072                     efi_md_end(pmd) != md->phys_addr) {
1073                         contig_low = GRANULEROUNDUP(md->phys_addr);
1074                         contig_high = efi_md_end(md);
1075                         for (q = p + efi_desc_size; q < efi_map_end;
1076                              q += efi_desc_size) {
1077                                 check_md = q;
1078                                 if (!efi_wb(check_md))
1079                                         break;
1080                                 if (contig_high != check_md->phys_addr)
1081                                         break;
1082                                 contig_high = efi_md_end(check_md);
1083                         }
1084                         contig_high = GRANULEROUNDDOWN(contig_high);
1085                 }
1086                 if (!is_memory_available(md))
1087                         continue;
1088
1089                 /*
1090                  * Round ends inward to granule boundaries
1091                  * Give trimmings to uncached allocator
1092                  */
1093                 if (md->phys_addr < contig_low) {
1094                         lim = min(efi_md_end(md), contig_low);
1095                         if (efi_uc(md)) {
1096                                 if (k > kern_memmap &&
1097                                     (k-1)->attribute == EFI_MEMORY_UC &&
1098                                     kmd_end(k-1) == md->phys_addr) {
1099                                         (k-1)->num_pages +=
1100                                                 (lim - md->phys_addr)
1101                                                 >> EFI_PAGE_SHIFT;
1102                                 } else {
1103                                         k->attribute = EFI_MEMORY_UC;
1104                                         k->start = md->phys_addr;
1105                                         k->num_pages = (lim - md->phys_addr)
1106                                                 >> EFI_PAGE_SHIFT;
1107                                         k++;
1108                                 }
1109                         }
1110                         as = contig_low;
1111                 } else
1112                         as = md->phys_addr;
1113
1114                 if (efi_md_end(md) > contig_high) {
1115                         lim = max(md->phys_addr, contig_high);
1116                         if (efi_uc(md)) {
1117                                 if (lim == md->phys_addr && k > kern_memmap &&
1118                                     (k-1)->attribute == EFI_MEMORY_UC &&
1119                                     kmd_end(k-1) == md->phys_addr) {
1120                                         (k-1)->num_pages += md->num_pages;
1121                                 } else {
1122                                         k->attribute = EFI_MEMORY_UC;
1123                                         k->start = lim;
1124                                         k->num_pages = (efi_md_end(md) - lim)
1125                                                 >> EFI_PAGE_SHIFT;
1126                                         k++;
1127                                 }
1128                         }
1129                         ae = contig_high;
1130                 } else
1131                         ae = efi_md_end(md);
1132
1133                 /* keep within max_addr= and min_addr= command line arg */
1134                 as = max(as, min_addr);
1135                 ae = min(ae, max_addr);
1136                 if (ae <= as)
1137                         continue;
1138
1139                 /* avoid going over mem= command line arg */
1140                 if (total_mem + (ae - as) > mem_limit)
1141                         ae -= total_mem + (ae - as) - mem_limit;
1142
1143                 if (ae <= as)
1144                         continue;
1145                 if (prev && kmd_end(prev) == md->phys_addr) {
1146                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1147                         total_mem += ae - as;
1148                         continue;
1149                 }
1150                 k->attribute = EFI_MEMORY_WB;
1151                 k->start = as;
1152                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1153                 total_mem += ae - as;
1154                 prev = k++;
1155         }
1156         k->start = ~0L; /* end-marker */
1157
1158         /* reserve the memory we are using for kern_memmap */
1159         *s = (u64)kern_memmap;
1160         *e = (u64)++k;
1161
1162         return total_mem;
1163 }
1164
1165 void
1166 efi_initialize_iomem_resources(struct resource *code_resource,
1167                                struct resource *data_resource,
1168                                struct resource *bss_resource)
1169 {
1170         struct resource *res;
1171         void *efi_map_start, *efi_map_end, *p;
1172         efi_memory_desc_t *md;
1173         u64 efi_desc_size;
1174         char *name;
1175         unsigned long flags, desc;
1176
1177         efi_map_start = __va(ia64_boot_param->efi_memmap);
1178         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1179         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1180
1181         res = NULL;
1182
1183         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1184                 md = p;
1185
1186                 if (md->num_pages == 0) /* should not happen */
1187                         continue;
1188
1189                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1190                 desc = IORES_DESC_NONE;
1191
1192                 switch (md->type) {
1193
1194                         case EFI_MEMORY_MAPPED_IO:
1195                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1196                                 continue;
1197
1198                         case EFI_LOADER_CODE:
1199                         case EFI_LOADER_DATA:
1200                         case EFI_BOOT_SERVICES_DATA:
1201                         case EFI_BOOT_SERVICES_CODE:
1202                         case EFI_CONVENTIONAL_MEMORY:
1203                                 if (md->attribute & EFI_MEMORY_WP) {
1204                                         name = "System ROM";
1205                                         flags |= IORESOURCE_READONLY;
1206                                 } else if (md->attribute == EFI_MEMORY_UC) {
1207                                         name = "Uncached RAM";
1208                                 } else {
1209                                         name = "System RAM";
1210                                         flags |= IORESOURCE_SYSRAM;
1211                                 }
1212                                 break;
1213
1214                         case EFI_ACPI_MEMORY_NVS:
1215                                 name = "ACPI Non-volatile Storage";
1216                                 desc = IORES_DESC_ACPI_NV_STORAGE;
1217                                 break;
1218
1219                         case EFI_UNUSABLE_MEMORY:
1220                                 name = "reserved";
1221                                 flags |= IORESOURCE_DISABLED;
1222                                 break;
1223
1224                         case EFI_PERSISTENT_MEMORY:
1225                                 name = "Persistent Memory";
1226                                 desc = IORES_DESC_PERSISTENT_MEMORY;
1227                                 break;
1228
1229                         case EFI_RESERVED_TYPE:
1230                         case EFI_RUNTIME_SERVICES_CODE:
1231                         case EFI_RUNTIME_SERVICES_DATA:
1232                         case EFI_ACPI_RECLAIM_MEMORY:
1233                         default:
1234                                 name = "reserved";
1235                                 break;
1236                 }
1237
1238                 if ((res = kzalloc(sizeof(struct resource),
1239                                    GFP_KERNEL)) == NULL) {
1240                         printk(KERN_ERR
1241                                "failed to allocate resource for iomem\n");
1242                         return;
1243                 }
1244
1245                 res->name = name;
1246                 res->start = md->phys_addr;
1247                 res->end = md->phys_addr + efi_md_size(md) - 1;
1248                 res->flags = flags;
1249                 res->desc = desc;
1250
1251                 if (insert_resource(&iomem_resource, res) < 0)
1252                         kfree(res);
1253                 else {
1254                         /*
1255                          * We don't know which region contains
1256                          * kernel data so we try it repeatedly and
1257                          * let the resource manager test it.
1258                          */
1259                         insert_resource(res, code_resource);
1260                         insert_resource(res, data_resource);
1261                         insert_resource(res, bss_resource);
1262 #ifdef CONFIG_KEXEC
1263                         insert_resource(res, &efi_memmap_res);
1264                         insert_resource(res, &boot_param_res);
1265                         if (crashk_res.end > crashk_res.start)
1266                                 insert_resource(res, &crashk_res);
1267 #endif
1268                 }
1269         }
1270 }
1271
1272 #ifdef CONFIG_KEXEC
1273 /* find a block of memory aligned to 64M exclude reserved regions
1274    rsvd_regions are sorted
1275  */
1276 unsigned long __init
1277 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1278 {
1279         int i;
1280         u64 start, end;
1281         u64 alignment = 1UL << _PAGE_SIZE_64M;
1282         void *efi_map_start, *efi_map_end, *p;
1283         efi_memory_desc_t *md;
1284         u64 efi_desc_size;
1285
1286         efi_map_start = __va(ia64_boot_param->efi_memmap);
1287         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1288         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1289
1290         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1291                 md = p;
1292                 if (!efi_wb(md))
1293                         continue;
1294                 start = ALIGN(md->phys_addr, alignment);
1295                 end = efi_md_end(md);
1296                 for (i = 0; i < n; i++) {
1297                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1298                                 if (__pa(r[i].start) > start + size)
1299                                         return start;
1300                                 start = ALIGN(__pa(r[i].end), alignment);
1301                                 if (i < n-1 &&
1302                                     __pa(r[i+1].start) < start + size)
1303                                         continue;
1304                                 else
1305                                         break;
1306                         }
1307                 }
1308                 if (end > start + size)
1309                         return start;
1310         }
1311
1312         printk(KERN_WARNING
1313                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1314         return ~0UL;
1315 }
1316 #endif
1317
1318 #ifdef CONFIG_CRASH_DUMP
1319 /* locate the size find a the descriptor at a certain address */
1320 unsigned long __init
1321 vmcore_find_descriptor_size (unsigned long address)
1322 {
1323         void *efi_map_start, *efi_map_end, *p;
1324         efi_memory_desc_t *md;
1325         u64 efi_desc_size;
1326         unsigned long ret = 0;
1327
1328         efi_map_start = __va(ia64_boot_param->efi_memmap);
1329         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1330         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1331
1332         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1333                 md = p;
1334                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1335                     && md->phys_addr == address) {
1336                         ret = efi_md_size(md);
1337                         break;
1338                 }
1339         }
1340
1341         if (ret == 0)
1342                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1343
1344         return ret;
1345 }
1346 #endif
1347
1348 char *efi_systab_show_arch(char *str)
1349 {
1350         if (mps_phys != EFI_INVALID_TABLE_ADDR)
1351                 str += sprintf(str, "MPS=0x%lx\n", mps_phys);
1352         if (hcdp_phys != EFI_INVALID_TABLE_ADDR)
1353                 str += sprintf(str, "HCDP=0x%lx\n", hcdp_phys);
1354         return str;
1355 }