arch/ia64/kernel/efi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Extensible Firmware Interface
   4  *
   5  * Based on Extensible Firmware Interface Specification version 0.9
   6  * April 30, 1999
   7  *
   8  * Copyright (C) 1999 VA Linux Systems
   9  * Copyright (C) 1999 Walt Drummond <[email protected]>
  10  * Copyright (C) 1999-2003 Hewlett-Packard Co.
  11  *      David Mosberger-Tang <[email protected]>
  12  *      Stephane Eranian <[email protected]>
  13  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  14  *      Bjorn Helgaas <[email protected]>
  15  *
  16  * All EFI Runtime Services are not implemented yet as EFI only
  17  * supports physical mode addressing on SoftSDV. This is to be fixed
  18  * in a future version.  --drummond 1999-07-20
  19  *
  20  * Implemented EFI runtime services and virtual mode calls.  --davidm
  21  *
  22  * Goutham Rao: <[email protected]>
  23  *      Skip non-WB memory and ignore empty memory ranges.
  24  */
  25 #include <linux/module.h>
  26 #include <linux/memblock.h>
  27 #include <linux/crash_dump.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/slab.h>
  32 #include <linux/time.h>
  33 #include <linux/efi.h>
  34 #include <linux/kexec.h>
  35 #include <linux/mm.h>
  36
  37 #include <asm/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 static __initdata unsigned long palo_phys;
  49
  50 static __initdata efi_config_table_type_t arch_tables[] = {
  51         {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
  52         {NULL_GUID, NULL, 0},
  53 };
  54
  55 extern efi_status_t efi_call_phys (void *, ...);
  56
  57 static efi_runtime_services_t *runtime;
  58 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  59
  60 #define efi_call_virt(f, args...)       (*(f))(args)
  61
  62 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  63 static efi_status_t                                                            \
  64 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  65 {                                                                              \
  66         struct ia64_fpreg fr[6];                                               \
  67         efi_time_cap_t *atc = NULL;                                            \
  68         efi_status_t ret;                                                      \
  69                                                                                \
  70         if (tc)                                                                \
  71                 atc = adjust_arg(tc);                                          \
  72         ia64_save_scratch_fpregs(fr);                                          \
  73         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  74                                 adjust_arg(tm), atc);                          \
  75         ia64_load_scratch_fpregs(fr);                                          \
  76         return ret;                                                            \
  77 }
  78
  79 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  80 static efi_status_t                                                            \
  81 prefix##_set_time (efi_time_t *tm)                                             \
  82 {                                                                              \
  83         struct ia64_fpreg fr[6];                                               \
  84         efi_status_t ret;                                                      \
  85                                                                                \
  86         ia64_save_scratch_fpregs(fr);                                          \
  87         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
  88                                 adjust_arg(tm));                               \
  89         ia64_load_scratch_fpregs(fr);                                          \
  90         return ret;                                                            \
  91 }
  92
  93 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
  94 static efi_status_t                                                            \
  95 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
  96                           efi_time_t *tm)                                      \
  97 {                                                                              \
  98         struct ia64_fpreg fr[6];                                               \
  99         efi_status_t ret;                                                      \
 100                                                                                \
 101         ia64_save_scratch_fpregs(fr);                                          \
 102         ret = efi_call_##prefix(                                               \
 103                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
 104                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
 105         ia64_load_scratch_fpregs(fr);                                          \
 106         return ret;                                                            \
 107 }
 108
 109 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 110 static efi_status_t                                                            \
 111 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 112 {                                                                              \
 113         struct ia64_fpreg fr[6];                                               \
 114         efi_time_t *atm = NULL;                                                \
 115         efi_status_t ret;                                                      \
 116                                                                                \
 117         if (tm)                                                                \
 118                 atm = adjust_arg(tm);                                          \
 119         ia64_save_scratch_fpregs(fr);                                          \
 120         ret = efi_call_##prefix(                                               \
 121                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 122                 enabled, atm);                                                 \
 123         ia64_load_scratch_fpregs(fr);                                          \
 124         return ret;                                                            \
 125 }
 126
 127 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 128 static efi_status_t                                                            \
 129 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 130                        unsigned long *data_size, void *data)                   \
 131 {                                                                              \
 132         struct ia64_fpreg fr[6];                                               \
 133         u32 *aattr = NULL;                                                     \
 134         efi_status_t ret;                                                      \
 135                                                                                \
 136         if (attr)                                                              \
 137                 aattr = adjust_arg(attr);                                      \
 138         ia64_save_scratch_fpregs(fr);                                          \
 139         ret = efi_call_##prefix(                                               \
 140                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 141                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 142                 adjust_arg(data_size), adjust_arg(data));                      \
 143         ia64_load_scratch_fpregs(fr);                                          \
 144         return ret;                                                            \
 145 }
 146
 147 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 148 static efi_status_t                                                            \
 149 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 150                             efi_guid_t *vendor)                                \
 151 {                                                                              \
 152         struct ia64_fpreg fr[6];                                               \
 153         efi_status_t ret;                                                      \
 154                                                                                \
 155         ia64_save_scratch_fpregs(fr);                                          \
 156         ret = efi_call_##prefix(                                               \
 157                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 158                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 159         ia64_load_scratch_fpregs(fr);                                          \
 160         return ret;                                                            \
 161 }
 162
 163 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 164 static efi_status_t                                                            \
 165 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 166                        u32 attr, unsigned long data_size,                      \
 167                        void *data)                                             \
 168 {                                                                              \
 169         struct ia64_fpreg fr[6];                                               \
 170         efi_status_t ret;                                                      \
 171                                                                                \
 172         ia64_save_scratch_fpregs(fr);                                          \
 173         ret = efi_call_##prefix(                                               \
 174                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 175                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 176                 adjust_arg(data));                                             \
 177         ia64_load_scratch_fpregs(fr);                                          \
 178         return ret;                                                            \
 179 }
 180
 181 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 182 static efi_status_t                                                            \
 183 prefix##_get_next_high_mono_count (u32 *count)                                 \
 184 {                                                                              \
 185         struct ia64_fpreg fr[6];                                               \
 186         efi_status_t ret;                                                      \
 187                                                                                \
 188         ia64_save_scratch_fpregs(fr);                                          \
 189         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 190                                 __va(runtime->get_next_high_mono_count),       \
 191                                 adjust_arg(count));                            \
 192         ia64_load_scratch_fpregs(fr);                                          \
 193         return ret;                                                            \
 194 }
 195
 196 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 197 static void                                                                    \
 198 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 199                        unsigned long data_size, efi_char16_t *data)            \
 200 {                                                                              \
 201         struct ia64_fpreg fr[6];                                               \
 202         efi_char16_t *adata = NULL;                                            \
 203                                                                                \
 204         if (data)                                                              \
 205                 adata = adjust_arg(data);                                      \
 206                                                                                \
 207         ia64_save_scratch_fpregs(fr);                                          \
 208         efi_call_##prefix(                                                     \
 209                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 210                 reset_type, status, data_size, adata);                         \
 211         /* should not return, but just in case... */                           \
 212         ia64_load_scratch_fpregs(fr);                                          \
 213 }
 214
 215 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 216
 217 STUB_GET_TIME(phys, phys_ptr)
 218 STUB_SET_TIME(phys, phys_ptr)
 219 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 220 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 221 STUB_GET_VARIABLE(phys, phys_ptr)
 222 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 223 STUB_SET_VARIABLE(phys, phys_ptr)
 224 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 225 STUB_RESET_SYSTEM(phys, phys_ptr)
 226
 227 #define id(arg) arg
 228
 229 STUB_GET_TIME(virt, id)
 230 STUB_SET_TIME(virt, id)
 231 STUB_GET_WAKEUP_TIME(virt, id)
 232 STUB_SET_WAKEUP_TIME(virt, id)
 233 STUB_GET_VARIABLE(virt, id)
 234 STUB_GET_NEXT_VARIABLE(virt, id)
 235 STUB_SET_VARIABLE(virt, id)
 236 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 237 STUB_RESET_SYSTEM(virt, id)
 238
 239 void
 240 efi_gettimeofday (struct timespec64 *ts)
 241 {
 242         efi_time_t tm;
 243
 244         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 245                 memset(ts, 0, sizeof(*ts));
 246                 return;
 247         }
 248
 249         ts->tv_sec = mktime64(tm.year, tm.month, tm.day,
 250                             tm.hour, tm.minute, tm.second);
 251         ts->tv_nsec = tm.nanosecond;
 252 }
 253
 254 static int
 255 is_memory_available (efi_memory_desc_t *md)
 256 {
 257         if (!(md->attribute & EFI_MEMORY_WB))
 258                 return 0;
 259
 260         switch (md->type) {
 261               case EFI_LOADER_CODE:
 262               case EFI_LOADER_DATA:
 263               case EFI_BOOT_SERVICES_CODE:
 264               case EFI_BOOT_SERVICES_DATA:
 265               case EFI_CONVENTIONAL_MEMORY:
 266                 return 1;
 267         }
 268         return 0;
 269 }
 270
 271 typedef struct kern_memdesc {
 272         u64 attribute;
 273         u64 start;
 274         u64 num_pages;
 275 } kern_memdesc_t;
 276
 277 static kern_memdesc_t *kern_memmap;
 278
 279 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 280
 281 static inline u64
 282 kmd_end(kern_memdesc_t *kmd)
 283 {
 284         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 285 }
 286
 287 static inline u64
 288 efi_md_end(efi_memory_desc_t *md)
 289 {
 290         return (md->phys_addr + efi_md_size(md));
 291 }
 292
 293 static inline int
 294 efi_wb(efi_memory_desc_t *md)
 295 {
 296         return (md->attribute & EFI_MEMORY_WB);
 297 }
 298
 299 static inline int
 300 efi_uc(efi_memory_desc_t *md)
 301 {
 302         return (md->attribute & EFI_MEMORY_UC);
 303 }
 304
 305 static void
 306 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 307 {
 308         kern_memdesc_t *k;
 309         u64 start, end, voff;
 310
 311         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 312         for (k = kern_memmap; k->start != ~0UL; k++) {
 313                 if (k->attribute != attr)
 314                         continue;
 315                 start = PAGE_ALIGN(k->start);
 316                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 317                 if (start < end)
 318                         if ((*callback)(start + voff, end + voff, arg) < 0)
 319                                 return;
 320         }
 321 }
 322
 323 /*
 324  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 325  * descriptor that has memory that is available for OS use.
 326  */
 327 void
 328 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 329 {
 330         walk(callback, arg, EFI_MEMORY_WB);
 331 }
 332
 333 /*
 334  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 335  * descriptor that has memory that is available for uncached allocator.
 336  */
 337 void
 338 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 339 {
 340         walk(callback, arg, EFI_MEMORY_UC);
 341 }
 342
 343 /*
 344  * Look for the PAL_CODE region reported by EFI and map it using an
 345  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 346  * Abstraction Layer chapter 11 in ADAG
 347  */
 348 void *
 349 efi_get_pal_addr (void)
 350 {
 351         void *efi_map_start, *efi_map_end, *p;
 352         efi_memory_desc_t *md;
 353         u64 efi_desc_size;
 354         int pal_code_count = 0;
 355         u64 vaddr, mask;
 356
 357         efi_map_start = __va(ia64_boot_param->efi_memmap);
 358         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 359         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 360
 361         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 362                 md = p;
 363                 if (md->type != EFI_PAL_CODE)
 364                         continue;
 365
 366                 if (++pal_code_count > 1) {
 367                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 368                                "dropped @ %llx\n", md->phys_addr);
 369                         continue;
 370                 }
 371                 /*
 372                  * The only ITLB entry in region 7 that is used is the one
 373                  * installed by __start().  That entry covers a 64MB range.
 374                  */
 375                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 376                 vaddr = PAGE_OFFSET + md->phys_addr;
 377
 378                 /*
 379                  * We must check that the PAL mapping won't overlap with the
 380                  * kernel mapping.
 381                  *
 382                  * PAL code is guaranteed to be aligned on a power of 2 between
 383                  * 4k and 256KB and that only one ITR is needed to map it. This
 384                  * implies that the PAL code is always aligned on its size,
 385                  * i.e., the closest matching page size supported by the TLB.
 386                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 387                  * it is bigger than 64MB (very unlikely!).  So for now the
 388                  * following test is enough to determine whether or not we need
 389                  * a dedicated ITR for the PAL code.
 390                  */
 391                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 392                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 393                                __func__);
 394                         continue;
 395                 }
 396
 397                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 398                         panic("Whoa!  PAL code size bigger than a granule!");
 399
 400 #if EFI_DEBUG
 401                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 402
 403                 printk(KERN_INFO "CPU %d: mapping PAL code "
 404                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 405                        smp_processor_id(), md->phys_addr,
 406                        md->phys_addr + efi_md_size(md),
 407                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 408 #endif
 409                 return __va(md->phys_addr);
 410         }
 411         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 412                __func__);
 413         return NULL;
 414 }
 415
 416
 417 static u8 __init palo_checksum(u8 *buffer, u32 length)
 418 {
 419         u8 sum = 0;
 420         u8 *end = buffer + length;
 421
 422         while (buffer < end)
 423                 sum = (u8) (sum + *(buffer++));
 424
 425         return sum;
 426 }
 427
 428 /*
 429  * Parse and handle PALO table which is published at:
 430  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 431  */
 432 static void __init handle_palo(unsigned long phys_addr)
 433 {
 434         struct palo_table *palo = __va(phys_addr);
 435         u8  checksum;
 436
 437         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 438                 printk(KERN_INFO "PALO signature incorrect.\n");
 439                 return;
 440         }
 441
 442         checksum = palo_checksum((u8 *)palo, palo->length);
 443         if (checksum) {
 444                 printk(KERN_INFO "PALO checksum incorrect.\n");
 445                 return;
 446         }
 447
 448         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 449 }
 450
 451 void
 452 efi_map_pal_code (void)
 453 {
 454         void *pal_vaddr = efi_get_pal_addr ();
 455         u64 psr;
 456
 457         if (!pal_vaddr)
 458                 return;
 459
 460         /*
 461          * Cannot write to CRx with PSR.ic=1
 462          */
 463         psr = ia64_clear_ic();
 464         ia64_itr(0x1, IA64_TR_PALCODE,
 465                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 466                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 467                  IA64_GRANULE_SHIFT);
 468         ia64_set_psr(psr);              /* restore psr */
 469 }
 470
 471 void __init
 472 efi_init (void)
 473 {
 474         void *efi_map_start, *efi_map_end;
 475         efi_char16_t *c16;
 476         u64 efi_desc_size;
 477         char *cp, vendor[100] = "unknown";
 478         int i;
 479
 480         set_bit(EFI_BOOT, &efi.flags);
 481         set_bit(EFI_64BIT, &efi.flags);
 482
 483         /*
 484          * It's too early to be able to use the standard kernel command line
 485          * support...
 486          */
 487         for (cp = boot_command_line; *cp; ) {
 488                 if (memcmp(cp, "mem=", 4) == 0) {
 489                         mem_limit = memparse(cp + 4, &cp);
 490                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 491                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 492                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 493                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 494                 } else {
 495                         while (*cp != ' ' && *cp)
 496                                 ++cp;
 497                         while (*cp == ' ')
 498                                 ++cp;
 499                 }
 500         }
 501         if (min_addr != 0UL)
 502                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 503                        min_addr >> 20);
 504         if (max_addr != ~0UL)
 505                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 506                        max_addr >> 20);
 507
 508         efi.systab = __va(ia64_boot_param->efi_systab);
 509
 510         /*
 511          * Verify the EFI Table
 512          */
 513         if (efi.systab == NULL)
 514                 panic("Whoa! Can't find EFI system table.\n");
 515         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 516                 panic("Whoa! EFI system table signature incorrect\n");
 517         if ((efi.systab->hdr.revision >> 16) == 0)
 518                 printk(KERN_WARNING "Warning: EFI system table version "
 519                        "%d.%02d, expected 1.00 or greater\n",
 520                        efi.systab->hdr.revision >> 16,
 521                        efi.systab->hdr.revision & 0xffff);
 522
 523         /* Show what we know for posterity */
 524         c16 = __va(efi.systab->fw_vendor);
 525         if (c16) {
 526                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 527                         vendor[i] = *c16++;
 528                 vendor[i] = '\0';
 529         }
 530
 531         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 532                efi.systab->hdr.revision >> 16,
 533                efi.systab->hdr.revision & 0xffff, vendor);
 534
 535         palo_phys      = EFI_INVALID_TABLE_ADDR;
 536
 537         if (efi_config_init(arch_tables) != 0)
 538                 return;
 539
 540         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 541                 handle_palo(palo_phys);
 542
 543         runtime = __va(efi.systab->runtime);
 544         efi.get_time = phys_get_time;
 545         efi.set_time = phys_set_time;
 546         efi.get_wakeup_time = phys_get_wakeup_time;
 547         efi.set_wakeup_time = phys_set_wakeup_time;
 548         efi.get_variable = phys_get_variable;
 549         efi.get_next_variable = phys_get_next_variable;
 550         efi.set_variable = phys_set_variable;
 551         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 552         efi.reset_system = phys_reset_system;
 553
 554         efi_map_start = __va(ia64_boot_param->efi_memmap);
 555         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 556         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 557
 558 #if EFI_DEBUG
 559         /* print EFI memory map: */
 560         {
 561                 efi_memory_desc_t *md;
 562                 void *p;
 563
 564                 for (i = 0, p = efi_map_start; p < efi_map_end;
 565                      ++i, p += efi_desc_size)
 566                 {
 567                         const char *unit;
 568                         unsigned long size;
 569                         char buf[64];
 570
 571                         md = p;
 572                         size = md->num_pages << EFI_PAGE_SHIFT;
 573
 574                         if ((size >> 40) > 0) {
 575                                 size >>= 40;
 576                                 unit = "TB";
 577                         } else if ((size >> 30) > 0) {
 578                                 size >>= 30;
 579                                 unit = "GB";
 580                         } else if ((size >> 20) > 0) {
 581                                 size >>= 20;
 582                                 unit = "MB";
 583                         } else {
 584                                 size >>= 10;
 585                                 unit = "KB";
 586                         }
 587
 588                         printk("mem%02d: %s "
 589                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 590                                i, efi_md_typeattr_format(buf, sizeof(buf), md),
 591                                md->phys_addr,
 592                                md->phys_addr + efi_md_size(md), size, unit);
 593                 }
 594         }
 595 #endif
 596
 597         efi_map_pal_code();
 598         efi_enter_virtual_mode();
 599 }
 600
 601 void
 602 efi_enter_virtual_mode (void)
 603 {
 604         void *efi_map_start, *efi_map_end, *p;
 605         efi_memory_desc_t *md;
 606         efi_status_t status;
 607         u64 efi_desc_size;
 608
 609         efi_map_start = __va(ia64_boot_param->efi_memmap);
 610         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 611         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 612
 613         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 614                 md = p;
 615                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 616                         /*
 617                          * Some descriptors have multiple bits set, so the
 618                          * order of the tests is relevant.
 619                          */
 620                         if (md->attribute & EFI_MEMORY_WB) {
 621                                 md->virt_addr = (u64) __va(md->phys_addr);
 622                         } else if (md->attribute & EFI_MEMORY_UC) {
 623                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 624                         } else if (md->attribute & EFI_MEMORY_WC) {
 625 #if 0
 626                                 md->virt_addr = ia64_remap(md->phys_addr,
 627                                                            (_PAGE_A |
 628                                                             _PAGE_P |
 629                                                             _PAGE_D |
 630                                                             _PAGE_MA_WC |
 631                                                             _PAGE_PL_0 |
 632                                                             _PAGE_AR_RW));
 633 #else
 634                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 635                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 636 #endif
 637                         } else if (md->attribute & EFI_MEMORY_WT) {
 638 #if 0
 639                                 md->virt_addr = ia64_remap(md->phys_addr,
 640                                                            (_PAGE_A |
 641                                                             _PAGE_P |
 642                                                             _PAGE_D |
 643                                                             _PAGE_MA_WT |
 644                                                             _PAGE_PL_0 |
 645                                                             _PAGE_AR_RW));
 646 #else
 647                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 648                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 649 #endif
 650                         }
 651                 }
 652         }
 653
 654         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 655                                ia64_boot_param->efi_memmap_size,
 656                                efi_desc_size,
 657                                ia64_boot_param->efi_memdesc_version,
 658                                ia64_boot_param->efi_memmap);
 659         if (status != EFI_SUCCESS) {
 660                 printk(KERN_WARNING "warning: unable to switch EFI into "
 661                        "virtual mode (status=%lu)\n", status);
 662                 return;
 663         }
 664
 665         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 666
 667         /*
 668          * Now that EFI is in virtual mode, we call the EFI functions more
 669          * efficiently:
 670          */
 671         efi.get_time = virt_get_time;
 672         efi.set_time = virt_set_time;
 673         efi.get_wakeup_time = virt_get_wakeup_time;
 674         efi.set_wakeup_time = virt_set_wakeup_time;
 675         efi.get_variable = virt_get_variable;
 676         efi.get_next_variable = virt_get_next_variable;
 677         efi.set_variable = virt_set_variable;
 678         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 679         efi.reset_system = virt_reset_system;
 680 }
 681
 682 /*
 683  * Walk the EFI memory map looking for the I/O port range.  There can only be
 684  * one entry of this type, other I/O port ranges should be described via ACPI.
 685  */
 686 u64
 687 efi_get_iobase (void)
 688 {
 689         void *efi_map_start, *efi_map_end, *p;
 690         efi_memory_desc_t *md;
 691         u64 efi_desc_size;
 692
 693         efi_map_start = __va(ia64_boot_param->efi_memmap);
 694         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 695         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 696
 697         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 698                 md = p;
 699                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 700                         if (md->attribute & EFI_MEMORY_UC)
 701                                 return md->phys_addr;
 702                 }
 703         }
 704         return 0;
 705 }
 706
 707 static struct kern_memdesc *
 708 kern_memory_descriptor (unsigned long phys_addr)
 709 {
 710         struct kern_memdesc *md;
 711
 712         for (md = kern_memmap; md->start != ~0UL; md++) {
 713                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 714                          return md;
 715         }
 716         return NULL;
 717 }
 718
 719 static efi_memory_desc_t *
 720 efi_memory_descriptor (unsigned long phys_addr)
 721 {
 722         void *efi_map_start, *efi_map_end, *p;
 723         efi_memory_desc_t *md;
 724         u64 efi_desc_size;
 725
 726         efi_map_start = __va(ia64_boot_param->efi_memmap);
 727         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 728         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 729
 730         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 731                 md = p;
 732
 733                 if (phys_addr - md->phys_addr < efi_md_size(md))
 734                          return md;
 735         }
 736         return NULL;
 737 }
 738
 739 static int
 740 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 741 {
 742         void *efi_map_start, *efi_map_end, *p;
 743         efi_memory_desc_t *md;
 744         u64 efi_desc_size;
 745         unsigned long end;
 746
 747         efi_map_start = __va(ia64_boot_param->efi_memmap);
 748         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 749         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 750
 751         end = phys_addr + size;
 752
 753         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 754                 md = p;
 755                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 756                         return 1;
 757         }
 758         return 0;
 759 }
 760
 761 int
 762 efi_mem_type (unsigned long phys_addr)
 763 {
 764         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 765
 766         if (md)
 767                 return md->type;
 768         return -EINVAL;
 769 }
 770
 771 u64
 772 efi_mem_attributes (unsigned long phys_addr)
 773 {
 774         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 775
 776         if (md)
 777                 return md->attribute;
 778         return 0;
 779 }
 780 EXPORT_SYMBOL(efi_mem_attributes);
 781
 782 u64
 783 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 784 {
 785         unsigned long end = phys_addr + size;
 786         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 787         u64 attr;
 788
 789         if (!md)
 790                 return 0;
 791
 792         /*
 793          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 794          * the kernel that firmware needs this region mapped.
 795          */
 796         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 797         do {
 798                 unsigned long md_end = efi_md_end(md);
 799
 800                 if (end <= md_end)
 801                         return attr;
 802
 803                 md = efi_memory_descriptor(md_end);
 804                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 805                         return 0;
 806         } while (md);
 807         return 0;       /* never reached */
 808 }
 809
 810 u64
 811 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 812 {
 813         unsigned long end = phys_addr + size;
 814         struct kern_memdesc *md;
 815         u64 attr;
 816
 817         /*
 818          * This is a hack for ioremap calls before we set up kern_memmap.
 819          * Maybe we should do efi_memmap_init() earlier instead.
 820          */
 821         if (!kern_memmap) {
 822                 attr = efi_mem_attribute(phys_addr, size);
 823                 if (attr & EFI_MEMORY_WB)
 824                         return EFI_MEMORY_WB;
 825                 return 0;
 826         }
 827
 828         md = kern_memory_descriptor(phys_addr);
 829         if (!md)
 830                 return 0;
 831
 832         attr = md->attribute;
 833         do {
 834                 unsigned long md_end = kmd_end(md);
 835
 836                 if (end <= md_end)
 837                         return attr;
 838
 839                 md = kern_memory_descriptor(md_end);
 840                 if (!md || md->attribute != attr)
 841                         return 0;
 842         } while (md);
 843         return 0;       /* never reached */
 844 }
 845
 846 int
 847 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size)
 848 {
 849         u64 attr;
 850
 851         /*
 852          * /dev/mem reads and writes use copy_to_user(), which implicitly
 853          * uses a granule-sized kernel identity mapping.  It's really
 854          * only safe to do this for regions in kern_memmap.  For more
 855          * details, see Documentation/ia64/aliasing.txt.
 856          */
 857         attr = kern_mem_attribute(phys_addr, size);
 858         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 859                 return 1;
 860         return 0;
 861 }
 862
 863 int
 864 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 865 {
 866         unsigned long phys_addr = pfn << PAGE_SHIFT;
 867         u64 attr;
 868
 869         attr = efi_mem_attribute(phys_addr, size);
 870
 871         /*
 872          * /dev/mem mmap uses normal user pages, so we don't need the entire
 873          * granule, but the entire region we're mapping must support the same
 874          * attribute.
 875          */
 876         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 877                 return 1;
 878
 879         /*
 880          * Intel firmware doesn't tell us about all the MMIO regions, so
 881          * in general we have to allow mmap requests.  But if EFI *does*
 882          * tell us about anything inside this region, we should deny it.
 883          * The user can always map a smaller region to avoid the overlap.
 884          */
 885         if (efi_memmap_intersects(phys_addr, size))
 886                 return 0;
 887
 888         return 1;
 889 }
 890
 891 pgprot_t
 892 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 893                      pgprot_t vma_prot)
 894 {
 895         unsigned long phys_addr = pfn << PAGE_SHIFT;
 896         u64 attr;
 897
 898         /*
 899          * For /dev/mem mmap, we use user mappings, but if the region is
 900          * in kern_memmap (and hence may be covered by a kernel mapping),
 901          * we must use the same attribute as the kernel mapping.
 902          */
 903         attr = kern_mem_attribute(phys_addr, size);
 904         if (attr & EFI_MEMORY_WB)
 905                 return pgprot_cacheable(vma_prot);
 906         else if (attr & EFI_MEMORY_UC)
 907                 return pgprot_noncached(vma_prot);
 908
 909         /*
 910          * Some chipsets don't support UC access to memory.  If
 911          * WB is supported, we prefer that.
 912          */
 913         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 914                 return pgprot_cacheable(vma_prot);
 915
 916         return pgprot_noncached(vma_prot);
 917 }
 918
 919 int __init
 920 efi_uart_console_only(void)
 921 {
 922         efi_status_t status;
 923         char *s, name[] = "ConOut";
 924         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 925         efi_char16_t *utf16, name_utf16[32];
 926         unsigned char data[1024];
 927         unsigned long size = sizeof(data);
 928         struct efi_generic_dev_path *hdr, *end_addr;
 929         int uart = 0;
 930
 931         /* Convert to UTF-16 */
 932         utf16 = name_utf16;
 933         s = name;
 934         while (*s)
 935                 *utf16++ = *s++ & 0x7f;
 936         *utf16 = 0;
 937
 938         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 939         if (status != EFI_SUCCESS) {
 940                 printk(KERN_ERR "No EFI %s variable?\n", name);
 941                 return 0;
 942         }
 943
 944         hdr = (struct efi_generic_dev_path *) data;
 945         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 946         while (hdr < end_addr) {
 947                 if (hdr->type == EFI_DEV_MSG &&
 948                     hdr->sub_type == EFI_DEV_MSG_UART)
 949                         uart = 1;
 950                 else if (hdr->type == EFI_DEV_END_PATH ||
 951                           hdr->type == EFI_DEV_END_PATH2) {
 952                         if (!uart)
 953                                 return 0;
 954                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 955                                 return 1;
 956                         uart = 0;
 957                 }
 958                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 959         }
 960         printk(KERN_ERR "Malformed %s value\n", name);
 961         return 0;
 962 }
 963
 964 /*
 965  * Look for the first granule aligned memory descriptor memory
 966  * that is big enough to hold EFI memory map. Make sure this
 967  * descriptor is at least granule sized so it does not get trimmed
 968  */
 969 struct kern_memdesc *
 970 find_memmap_space (void)
 971 {
 972         u64     contig_low=0, contig_high=0;
 973         u64     as = 0, ae;
 974         void *efi_map_start, *efi_map_end, *p, *q;
 975         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 976         u64     space_needed, efi_desc_size;
 977         unsigned long total_mem = 0;
 978
 979         efi_map_start = __va(ia64_boot_param->efi_memmap);
 980         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 981         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 982
 983         /*
 984          * Worst case: we need 3 kernel descriptors for each efi descriptor
 985          * (if every entry has a WB part in the middle, and UC head and tail),
 986          * plus one for the end marker.
 987          */
 988         space_needed = sizeof(kern_memdesc_t) *
 989                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 990
 991         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 992                 md = p;
 993                 if (!efi_wb(md)) {
 994                         continue;
 995                 }
 996                 if (pmd == NULL || !efi_wb(pmd) ||
 997                     efi_md_end(pmd) != md->phys_addr) {
 998                         contig_low = GRANULEROUNDUP(md->phys_addr);
 999                         contig_high = efi_md_end(md);
1000                         for (q = p + efi_desc_size; q < efi_map_end;
1001                              q += efi_desc_size) {
1002                                 check_md = q;
1003                                 if (!efi_wb(check_md))
1004                                         break;
1005                                 if (contig_high != check_md->phys_addr)
1006                                         break;
1007                                 contig_high = efi_md_end(check_md);
1008                         }
1009                         contig_high = GRANULEROUNDDOWN(contig_high);
1010                 }
1011                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1012                         continue;
1013
1014                 /* Round ends inward to granule boundaries */
1015                 as = max(contig_low, md->phys_addr);
1016                 ae = min(contig_high, efi_md_end(md));
1017
1018                 /* keep within max_addr= and min_addr= command line arg */
1019                 as = max(as, min_addr);
1020                 ae = min(ae, max_addr);
1021                 if (ae <= as)
1022                         continue;
1023
1024                 /* avoid going over mem= command line arg */
1025                 if (total_mem + (ae - as) > mem_limit)
1026                         ae -= total_mem + (ae - as) - mem_limit;
1027
1028                 if (ae <= as)
1029                         continue;
1030
1031                 if (ae - as > space_needed)
1032                         break;
1033         }
1034         if (p >= efi_map_end)
1035                 panic("Can't allocate space for kernel memory descriptors");
1036
1037         return __va(as);
1038 }
1039
1040 /*
1041  * Walk the EFI memory map and gather all memory available for kernel
1042  * to use.  We can allocate partial granules only if the unavailable
1043  * parts exist, and are WB.
1044  */
1045 unsigned long
1046 efi_memmap_init(u64 *s, u64 *e)
1047 {
1048         struct kern_memdesc *k, *prev = NULL;
1049         u64     contig_low=0, contig_high=0;
1050         u64     as, ae, lim;
1051         void *efi_map_start, *efi_map_end, *p, *q;
1052         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1053         u64     efi_desc_size;
1054         unsigned long total_mem = 0;
1055
1056         k = kern_memmap = find_memmap_space();
1057
1058         efi_map_start = __va(ia64_boot_param->efi_memmap);
1059         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1060         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1061
1062         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1063                 md = p;
1064                 if (!efi_wb(md)) {
1065                         if (efi_uc(md) &&
1066                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1067                              md->type == EFI_BOOT_SERVICES_DATA)) {
1068                                 k->attribute = EFI_MEMORY_UC;
1069                                 k->start = md->phys_addr;
1070                                 k->num_pages = md->num_pages;
1071                                 k++;
1072                         }
1073                         continue;
1074                 }
1075                 if (pmd == NULL || !efi_wb(pmd) ||
1076                     efi_md_end(pmd) != md->phys_addr) {
1077                         contig_low = GRANULEROUNDUP(md->phys_addr);
1078                         contig_high = efi_md_end(md);
1079                         for (q = p + efi_desc_size; q < efi_map_end;
1080                              q += efi_desc_size) {
1081                                 check_md = q;
1082                                 if (!efi_wb(check_md))
1083                                         break;
1084                                 if (contig_high != check_md->phys_addr)
1085                                         break;
1086                                 contig_high = efi_md_end(check_md);
1087                         }
1088                         contig_high = GRANULEROUNDDOWN(contig_high);
1089                 }
1090                 if (!is_memory_available(md))
1091                         continue;
1092
1093                 /*
1094                  * Round ends inward to granule boundaries
1095                  * Give trimmings to uncached allocator
1096                  */
1097                 if (md->phys_addr < contig_low) {
1098                         lim = min(efi_md_end(md), contig_low);
1099                         if (efi_uc(md)) {
1100                                 if (k > kern_memmap &&
1101                                     (k-1)->attribute == EFI_MEMORY_UC &&
1102                                     kmd_end(k-1) == md->phys_addr) {
1103                                         (k-1)->num_pages +=
1104                                                 (lim - md->phys_addr)
1105                                                 >> EFI_PAGE_SHIFT;
1106                                 } else {
1107                                         k->attribute = EFI_MEMORY_UC;
1108                                         k->start = md->phys_addr;
1109                                         k->num_pages = (lim - md->phys_addr)
1110                                                 >> EFI_PAGE_SHIFT;
1111                                         k++;
1112                                 }
1113                         }
1114                         as = contig_low;
1115                 } else
1116                         as = md->phys_addr;
1117
1118                 if (efi_md_end(md) > contig_high) {
1119                         lim = max(md->phys_addr, contig_high);
1120                         if (efi_uc(md)) {
1121                                 if (lim == md->phys_addr && k > kern_memmap &&
1122                                     (k-1)->attribute == EFI_MEMORY_UC &&
1123                                     kmd_end(k-1) == md->phys_addr) {
1124                                         (k-1)->num_pages += md->num_pages;
1125                                 } else {
1126                                         k->attribute = EFI_MEMORY_UC;
1127                                         k->start = lim;
1128                                         k->num_pages = (efi_md_end(md) - lim)
1129                                                 >> EFI_PAGE_SHIFT;
1130                                         k++;
1131                                 }
1132                         }
1133                         ae = contig_high;
1134                 } else
1135                         ae = efi_md_end(md);
1136
1137                 /* keep within max_addr= and min_addr= command line arg */
1138                 as = max(as, min_addr);
1139                 ae = min(ae, max_addr);
1140                 if (ae <= as)
1141                         continue;
1142
1143                 /* avoid going over mem= command line arg */
1144                 if (total_mem + (ae - as) > mem_limit)
1145                         ae -= total_mem + (ae - as) - mem_limit;
1146
1147                 if (ae <= as)
1148                         continue;
1149                 if (prev && kmd_end(prev) == md->phys_addr) {
1150                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1151                         total_mem += ae - as;
1152                         continue;
1153                 }
1154                 k->attribute = EFI_MEMORY_WB;
1155                 k->start = as;
1156                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1157                 total_mem += ae - as;
1158                 prev = k++;
1159         }
1160         k->start = ~0L; /* end-marker */
1161
1162         /* reserve the memory we are using for kern_memmap */
1163         *s = (u64)kern_memmap;
1164         *e = (u64)++k;
1165
1166         return total_mem;
1167 }
1168
1169 void
1170 efi_initialize_iomem_resources(struct resource *code_resource,
1171                                struct resource *data_resource,
1172                                struct resource *bss_resource)
1173 {
1174         struct resource *res;
1175         void *efi_map_start, *efi_map_end, *p;
1176         efi_memory_desc_t *md;
1177         u64 efi_desc_size;
1178         char *name;
1179         unsigned long flags, desc;
1180
1181         efi_map_start = __va(ia64_boot_param->efi_memmap);
1182         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1183         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1184
1185         res = NULL;
1186
1187         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1188                 md = p;
1189
1190                 if (md->num_pages == 0) /* should not happen */
1191                         continue;
1192
1193                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1194                 desc = IORES_DESC_NONE;
1195
1196                 switch (md->type) {
1197
1198                         case EFI_MEMORY_MAPPED_IO:
1199                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1200                                 continue;
1201
1202                         case EFI_LOADER_CODE:
1203                         case EFI_LOADER_DATA:
1204                         case EFI_BOOT_SERVICES_DATA:
1205                         case EFI_BOOT_SERVICES_CODE:
1206                         case EFI_CONVENTIONAL_MEMORY:
1207                                 if (md->attribute & EFI_MEMORY_WP) {
1208                                         name = "System ROM";
1209                                         flags |= IORESOURCE_READONLY;
1210                                 } else if (md->attribute == EFI_MEMORY_UC) {
1211                                         name = "Uncached RAM";
1212                                 } else {
1213                                         name = "System RAM";
1214                                         flags |= IORESOURCE_SYSRAM;
1215                                 }
1216                                 break;
1217
1218                         case EFI_ACPI_MEMORY_NVS:
1219                                 name = "ACPI Non-volatile Storage";
1220                                 desc = IORES_DESC_ACPI_NV_STORAGE;
1221                                 break;
1222
1223                         case EFI_UNUSABLE_MEMORY:
1224                                 name = "reserved";
1225                                 flags |= IORESOURCE_DISABLED;
1226                                 break;
1227
1228                         case EFI_PERSISTENT_MEMORY:
1229                                 name = "Persistent Memory";
1230                                 desc = IORES_DESC_PERSISTENT_MEMORY;
1231                                 break;
1232
1233                         case EFI_RESERVED_TYPE:
1234                         case EFI_RUNTIME_SERVICES_CODE:
1235                         case EFI_RUNTIME_SERVICES_DATA:
1236                         case EFI_ACPI_RECLAIM_MEMORY:
1237                         default:
1238                                 name = "reserved";
1239                                 break;
1240                 }
1241
1242                 if ((res = kzalloc(sizeof(struct resource),
1243                                    GFP_KERNEL)) == NULL) {
1244                         printk(KERN_ERR
1245                                "failed to allocate resource for iomem\n");
1246                         return;
1247                 }
1248
1249                 res->name = name;
1250                 res->start = md->phys_addr;
1251                 res->end = md->phys_addr + efi_md_size(md) - 1;
1252                 res->flags = flags;
1253                 res->desc = desc;
1254
1255                 if (insert_resource(&iomem_resource, res) < 0)
1256                         kfree(res);
1257                 else {
1258                         /*
1259                          * We don't know which region contains
1260                          * kernel data so we try it repeatedly and
1261                          * let the resource manager test it.
1262                          */
1263                         insert_resource(res, code_resource);
1264                         insert_resource(res, data_resource);
1265                         insert_resource(res, bss_resource);
1266 #ifdef CONFIG_KEXEC
1267                         insert_resource(res, &efi_memmap_res);
1268                         insert_resource(res, &boot_param_res);
1269                         if (crashk_res.end > crashk_res.start)
1270                                 insert_resource(res, &crashk_res);
1271 #endif
1272                 }
1273         }
1274 }
1275
1276 #ifdef CONFIG_KEXEC
1277 /* find a block of memory aligned to 64M exclude reserved regions
1278    rsvd_regions are sorted
1279  */
1280 unsigned long __init
1281 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1282 {
1283         int i;
1284         u64 start, end;
1285         u64 alignment = 1UL << _PAGE_SIZE_64M;
1286         void *efi_map_start, *efi_map_end, *p;
1287         efi_memory_desc_t *md;
1288         u64 efi_desc_size;
1289
1290         efi_map_start = __va(ia64_boot_param->efi_memmap);
1291         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1292         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1293
1294         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1295                 md = p;
1296                 if (!efi_wb(md))
1297                         continue;
1298                 start = ALIGN(md->phys_addr, alignment);
1299                 end = efi_md_end(md);
1300                 for (i = 0; i < n; i++) {
1301                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1302                                 if (__pa(r[i].start) > start + size)
1303                                         return start;
1304                                 start = ALIGN(__pa(r[i].end), alignment);
1305                                 if (i < n-1 &&
1306                                     __pa(r[i+1].start) < start + size)
1307                                         continue;
1308                                 else
1309                                         break;
1310                         }
1311                 }
1312                 if (end > start + size)
1313                         return start;
1314         }
1315
1316         printk(KERN_WARNING
1317                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1318         return ~0UL;
1319 }
1320 #endif
1321
1322 #ifdef CONFIG_CRASH_DUMP
1323 /* locate the size find a the descriptor at a certain address */
1324 unsigned long __init
1325 vmcore_find_descriptor_size (unsigned long address)
1326 {
1327         void *efi_map_start, *efi_map_end, *p;
1328         efi_memory_desc_t *md;
1329         u64 efi_desc_size;
1330         unsigned long ret = 0;
1331
1332         efi_map_start = __va(ia64_boot_param->efi_memmap);
1333         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1334         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1335
1336         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1337                 md = p;
1338                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1339                     && md->phys_addr == address) {
1340                         ret = efi_md_size(md);
1341                         break;
1342                 }
1343         }
1344
1345         if (ret == 0)
1346                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1347
1348         return ret;
1349 }
1350 #endif