arch/ia64/kernel/efi.c

   1 /*
   2  * Extensible Firmware Interface
   3  *
   4  * Based on Extensible Firmware Interface Specification version 0.9
   5  * April 30, 1999
   6  *
   7  * Copyright (C) 1999 VA Linux Systems
   8  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   9  * Copyright (C) 1999-2003 Hewlett-Packard Co.
  10  *      David Mosberger-Tang <davidm@hpl.hp.com>
  11  *      Stephane Eranian <eranian@hpl.hp.com>
  12  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  13  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  14  *
  15  * All EFI Runtime Services are not implemented yet as EFI only
  16  * supports physical mode addressing on SoftSDV. This is to be fixed
  17  * in a future version.  --drummond 1999-07-20
  18  *
  19  * Implemented EFI runtime services and virtual mode calls.  --davidm
  20  *
  21  * Goutham Rao: <goutham.rao@intel.com>
  22  *      Skip non-WB memory and ignore empty memory ranges.
  23  */
  24 #include <linux/module.h>
  25 #include <linux/bootmem.h>
  26 #include <linux/crash_dump.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/slab.h>
  31 #include <linux/time.h>
  32 #include <linux/efi.h>
  33 #include <linux/kexec.h>
  34 #include <linux/mm.h>
  35
  36 #include <asm/io.h>
  37 #include <asm/kregs.h>
  38 #include <asm/meminit.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/processor.h>
  41 #include <asm/mca.h>
  42 #include <asm/tlbflush.h>
  43
  44 #define EFI_DEBUG       0
  45
  46 extern efi_status_t efi_call_phys (void *, ...);
  47
  48 struct efi efi;
  49 EXPORT_SYMBOL(efi);
  50 static efi_runtime_services_t *runtime;
  51 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  52
  53 #define efi_call_virt(f, args...)       (*(f))(args)
  54
  55 #define STUB_GET_TIME(prefix, adjust_arg)                                      \
  56 static efi_status_t                                                            \
  57 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                         \
  58 {                                                                              \
  59         struct ia64_fpreg fr[6];                                               \
  60         efi_time_cap_t *atc = NULL;                                            \
  61         efi_status_t ret;                                                      \
  62                                                                                \
  63         if (tc)                                                                \
  64                 atc = adjust_arg(tc);                                          \
  65         ia64_save_scratch_fpregs(fr);                                          \
  66         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time),    \
  67                                 adjust_arg(tm), atc);                          \
  68         ia64_load_scratch_fpregs(fr);                                          \
  69         return ret;                                                            \
  70 }
  71
  72 #define STUB_SET_TIME(prefix, adjust_arg)                                      \
  73 static efi_status_t                                                            \
  74 prefix##_set_time (efi_time_t *tm)                                             \
  75 {                                                                              \
  76         struct ia64_fpreg fr[6];                                               \
  77         efi_status_t ret;                                                      \
  78                                                                                \
  79         ia64_save_scratch_fpregs(fr);                                          \
  80         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time),    \
  81                                 adjust_arg(tm));                               \
  82         ia64_load_scratch_fpregs(fr);                                          \
  83         return ret;                                                            \
  84 }
  85
  86 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                               \
  87 static efi_status_t                                                            \
  88 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending,            \
  89                           efi_time_t *tm)                                      \
  90 {                                                                              \
  91         struct ia64_fpreg fr[6];                                               \
  92         efi_status_t ret;                                                      \
  93                                                                                \
  94         ia64_save_scratch_fpregs(fr);                                          \
  95         ret = efi_call_##prefix(                                               \
  96                 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),      \
  97                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));     \
  98         ia64_load_scratch_fpregs(fr);                                          \
  99         return ret;                                                            \
 100 }
 101
 102 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                               \
 103 static efi_status_t                                                            \
 104 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                  \
 105 {                                                                              \
 106         struct ia64_fpreg fr[6];                                               \
 107         efi_time_t *atm = NULL;                                                \
 108         efi_status_t ret;                                                      \
 109                                                                                \
 110         if (tm)                                                                \
 111                 atm = adjust_arg(tm);                                          \
 112         ia64_save_scratch_fpregs(fr);                                          \
 113         ret = efi_call_##prefix(                                               \
 114                 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),      \
 115                 enabled, atm);                                                 \
 116         ia64_load_scratch_fpregs(fr);                                          \
 117         return ret;                                                            \
 118 }
 119
 120 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                  \
 121 static efi_status_t                                                            \
 122 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,      \
 123                        unsigned long *data_size, void *data)                   \
 124 {                                                                              \
 125         struct ia64_fpreg fr[6];                                               \
 126         u32 *aattr = NULL;                                                     \
 127         efi_status_t ret;                                                      \
 128                                                                                \
 129         if (attr)                                                              \
 130                 aattr = adjust_arg(attr);                                      \
 131         ia64_save_scratch_fpregs(fr);                                          \
 132         ret = efi_call_##prefix(                                               \
 133                 (efi_get_variable_t *) __va(runtime->get_variable),            \
 134                 adjust_arg(name), adjust_arg(vendor), aattr,                   \
 135                 adjust_arg(data_size), adjust_arg(data));                      \
 136         ia64_load_scratch_fpregs(fr);                                          \
 137         return ret;                                                            \
 138 }
 139
 140 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                             \
 141 static efi_status_t                                                            \
 142 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name,      \
 143                             efi_guid_t *vendor)                                \
 144 {                                                                              \
 145         struct ia64_fpreg fr[6];                                               \
 146         efi_status_t ret;                                                      \
 147                                                                                \
 148         ia64_save_scratch_fpregs(fr);                                          \
 149         ret = efi_call_##prefix(                                               \
 150                 (efi_get_next_variable_t *) __va(runtime->get_next_variable),  \
 151                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));  \
 152         ia64_load_scratch_fpregs(fr);                                          \
 153         return ret;                                                            \
 154 }
 155
 156 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                  \
 157 static efi_status_t                                                            \
 158 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor,                 \
 159                        unsigned long attr, unsigned long data_size,            \
 160                        void *data)                                             \
 161 {                                                                              \
 162         struct ia64_fpreg fr[6];                                               \
 163         efi_status_t ret;                                                      \
 164                                                                                \
 165         ia64_save_scratch_fpregs(fr);                                          \
 166         ret = efi_call_##prefix(                                               \
 167                 (efi_set_variable_t *) __va(runtime->set_variable),            \
 168                 adjust_arg(name), adjust_arg(vendor), attr, data_size,         \
 169                 adjust_arg(data));                                             \
 170         ia64_load_scratch_fpregs(fr);                                          \
 171         return ret;                                                            \
 172 }
 173
 174 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                      \
 175 static efi_status_t                                                            \
 176 prefix##_get_next_high_mono_count (u32 *count)                                 \
 177 {                                                                              \
 178         struct ia64_fpreg fr[6];                                               \
 179         efi_status_t ret;                                                      \
 180                                                                                \
 181         ia64_save_scratch_fpregs(fr);                                          \
 182         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)             \
 183                                 __va(runtime->get_next_high_mono_count),       \
 184                                 adjust_arg(count));                            \
 185         ia64_load_scratch_fpregs(fr);                                          \
 186         return ret;                                                            \
 187 }
 188
 189 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                  \
 190 static void                                                                    \
 191 prefix##_reset_system (int reset_type, efi_status_t status,                    \
 192                        unsigned long data_size, efi_char16_t *data)            \
 193 {                                                                              \
 194         struct ia64_fpreg fr[6];                                               \
 195         efi_char16_t *adata = NULL;                                            \
 196                                                                                \
 197         if (data)                                                              \
 198                 adata = adjust_arg(data);                                      \
 199                                                                                \
 200         ia64_save_scratch_fpregs(fr);                                          \
 201         efi_call_##prefix(                                                     \
 202                 (efi_reset_system_t *) __va(runtime->reset_system),            \
 203                 reset_type, status, data_size, adata);                         \
 204         /* should not return, but just in case... */                           \
 205         ia64_load_scratch_fpregs(fr);                                          \
 206 }
 207
 208 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 209
 210 STUB_GET_TIME(phys, phys_ptr)
 211 STUB_SET_TIME(phys, phys_ptr)
 212 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 213 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 214 STUB_GET_VARIABLE(phys, phys_ptr)
 215 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 216 STUB_SET_VARIABLE(phys, phys_ptr)
 217 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 218 STUB_RESET_SYSTEM(phys, phys_ptr)
 219
 220 #define id(arg) arg
 221
 222 STUB_GET_TIME(virt, id)
 223 STUB_SET_TIME(virt, id)
 224 STUB_GET_WAKEUP_TIME(virt, id)
 225 STUB_SET_WAKEUP_TIME(virt, id)
 226 STUB_GET_VARIABLE(virt, id)
 227 STUB_GET_NEXT_VARIABLE(virt, id)
 228 STUB_SET_VARIABLE(virt, id)
 229 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 230 STUB_RESET_SYSTEM(virt, id)
 231
 232 void
 233 efi_gettimeofday (struct timespec *ts)
 234 {
 235         efi_time_t tm;
 236
 237         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 238                 memset(ts, 0, sizeof(*ts));
 239                 return;
 240         }
 241
 242         ts->tv_sec = mktime(tm.year, tm.month, tm.day,
 243                             tm.hour, tm.minute, tm.second);
 244         ts->tv_nsec = tm.nanosecond;
 245 }
 246
 247 static int
 248 is_memory_available (efi_memory_desc_t *md)
 249 {
 250         if (!(md->attribute & EFI_MEMORY_WB))
 251                 return 0;
 252
 253         switch (md->type) {
 254               case EFI_LOADER_CODE:
 255               case EFI_LOADER_DATA:
 256               case EFI_BOOT_SERVICES_CODE:
 257               case EFI_BOOT_SERVICES_DATA:
 258               case EFI_CONVENTIONAL_MEMORY:
 259                 return 1;
 260         }
 261         return 0;
 262 }
 263
 264 typedef struct kern_memdesc {
 265         u64 attribute;
 266         u64 start;
 267         u64 num_pages;
 268 } kern_memdesc_t;
 269
 270 static kern_memdesc_t *kern_memmap;
 271
 272 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 273
 274 static inline u64
 275 kmd_end(kern_memdesc_t *kmd)
 276 {
 277         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 278 }
 279
 280 static inline u64
 281 efi_md_end(efi_memory_desc_t *md)
 282 {
 283         return (md->phys_addr + efi_md_size(md));
 284 }
 285
 286 static inline int
 287 efi_wb(efi_memory_desc_t *md)
 288 {
 289         return (md->attribute & EFI_MEMORY_WB);
 290 }
 291
 292 static inline int
 293 efi_uc(efi_memory_desc_t *md)
 294 {
 295         return (md->attribute & EFI_MEMORY_UC);
 296 }
 297
 298 static void
 299 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 300 {
 301         kern_memdesc_t *k;
 302         u64 start, end, voff;
 303
 304         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 305         for (k = kern_memmap; k->start != ~0UL; k++) {
 306                 if (k->attribute != attr)
 307                         continue;
 308                 start = PAGE_ALIGN(k->start);
 309                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 310                 if (start < end)
 311                         if ((*callback)(start + voff, end + voff, arg) < 0)
 312                                 return;
 313         }
 314 }
 315
 316 /*
 317  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 318  * descriptor that has memory that is available for OS use.
 319  */
 320 void
 321 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 322 {
 323         walk(callback, arg, EFI_MEMORY_WB);
 324 }
 325
 326 /*
 327  * Walk the EFI memory map and call CALLBACK once for each EFI memory
 328  * descriptor that has memory that is available for uncached allocator.
 329  */
 330 void
 331 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 332 {
 333         walk(callback, arg, EFI_MEMORY_UC);
 334 }
 335
 336 /*
 337  * Look for the PAL_CODE region reported by EFI and map it using an
 338  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 339  * Abstraction Layer chapter 11 in ADAG
 340  */
 341 void *
 342 efi_get_pal_addr (void)
 343 {
 344         void *efi_map_start, *efi_map_end, *p;
 345         efi_memory_desc_t *md;
 346         u64 efi_desc_size;
 347         int pal_code_count = 0;
 348         u64 vaddr, mask;
 349
 350         efi_map_start = __va(ia64_boot_param->efi_memmap);
 351         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 352         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 353
 354         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 355                 md = p;
 356                 if (md->type != EFI_PAL_CODE)
 357                         continue;
 358
 359                 if (++pal_code_count > 1) {
 360                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, "
 361                                "dropped @ %llx\n", md->phys_addr);
 362                         continue;
 363                 }
 364                 /*
 365                  * The only ITLB entry in region 7 that is used is the one
 366                  * installed by __start().  That entry covers a 64MB range.
 367                  */
 368                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 369                 vaddr = PAGE_OFFSET + md->phys_addr;
 370
 371                 /*
 372                  * We must check that the PAL mapping won't overlap with the
 373                  * kernel mapping.
 374                  *
 375                  * PAL code is guaranteed to be aligned on a power of 2 between
 376                  * 4k and 256KB and that only one ITR is needed to map it. This
 377                  * implies that the PAL code is always aligned on its size,
 378                  * i.e., the closest matching page size supported by the TLB.
 379                  * Therefore PAL code is guaranteed never to cross a 64MB unless
 380                  * it is bigger than 64MB (very unlikely!).  So for now the
 381                  * following test is enough to determine whether or not we need
 382                  * a dedicated ITR for the PAL code.
 383                  */
 384                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 385                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 386                                __func__);
 387                         continue;
 388                 }
 389
 390                 if (efi_md_size(md) > IA64_GRANULE_SIZE)
 391                         panic("Whoa!  PAL code size bigger than a granule!");
 392
 393 #if EFI_DEBUG
 394                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 395
 396                 printk(KERN_INFO "CPU %d: mapping PAL code "
 397                        "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 398                        smp_processor_id(), md->phys_addr,
 399                        md->phys_addr + efi_md_size(md),
 400                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 401 #endif
 402                 return __va(md->phys_addr);
 403         }
 404         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 405                __func__);
 406         return NULL;
 407 }
 408
 409
 410 static u8 __init palo_checksum(u8 *buffer, u32 length)
 411 {
 412         u8 sum = 0;
 413         u8 *end = buffer + length;
 414
 415         while (buffer < end)
 416                 sum = (u8) (sum + *(buffer++));
 417
 418         return sum;
 419 }
 420
 421 /*
 422  * Parse and handle PALO table which is published at:
 423  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
 424  */
 425 static void __init handle_palo(unsigned long palo_phys)
 426 {
 427         struct palo_table *palo = __va(palo_phys);
 428         u8  checksum;
 429
 430         if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
 431                 printk(KERN_INFO "PALO signature incorrect.\n");
 432                 return;
 433         }
 434
 435         checksum = palo_checksum((u8 *)palo, palo->length);
 436         if (checksum) {
 437                 printk(KERN_INFO "PALO checksum incorrect.\n");
 438                 return;
 439         }
 440
 441         setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO);
 442 }
 443
 444 void
 445 efi_map_pal_code (void)
 446 {
 447         void *pal_vaddr = efi_get_pal_addr ();
 448         u64 psr;
 449
 450         if (!pal_vaddr)
 451                 return;
 452
 453         /*
 454          * Cannot write to CRx with PSR.ic=1
 455          */
 456         psr = ia64_clear_ic();
 457         ia64_itr(0x1, IA64_TR_PALCODE,
 458                  GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 459                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 460                  IA64_GRANULE_SHIFT);
 461         paravirt_dv_serialize_data();
 462         ia64_set_psr(psr);              /* restore psr */
 463 }
 464
 465 void __init
 466 efi_init (void)
 467 {
 468         void *efi_map_start, *efi_map_end;
 469         efi_config_table_t *config_tables;
 470         efi_char16_t *c16;
 471         u64 efi_desc_size;
 472         char *cp, vendor[100] = "unknown";
 473         int i;
 474         unsigned long palo_phys;
 475
 476         /*
 477          * It's too early to be able to use the standard kernel command line
 478          * support...
 479          */
 480         for (cp = boot_command_line; *cp; ) {
 481                 if (memcmp(cp, "mem=", 4) == 0) {
 482                         mem_limit = memparse(cp + 4, &cp);
 483                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 484                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 485                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 486                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 487                 } else {
 488                         while (*cp != ' ' && *cp)
 489                                 ++cp;
 490                         while (*cp == ' ')
 491                                 ++cp;
 492                 }
 493         }
 494         if (min_addr != 0UL)
 495                 printk(KERN_INFO "Ignoring memory below %lluMB\n",
 496                        min_addr >> 20);
 497         if (max_addr != ~0UL)
 498                 printk(KERN_INFO "Ignoring memory above %lluMB\n",
 499                        max_addr >> 20);
 500
 501         efi.systab = __va(ia64_boot_param->efi_systab);
 502
 503         /*
 504          * Verify the EFI Table
 505          */
 506         if (efi.systab == NULL)
 507                 panic("Whoa! Can't find EFI system table.\n");
 508         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 509                 panic("Whoa! EFI system table signature incorrect\n");
 510         if ((efi.systab->hdr.revision >> 16) == 0)
 511                 printk(KERN_WARNING "Warning: EFI system table version "
 512                        "%d.%02d, expected 1.00 or greater\n",
 513                        efi.systab->hdr.revision >> 16,
 514                        efi.systab->hdr.revision & 0xffff);
 515
 516         config_tables = __va(efi.systab->tables);
 517
 518         /* Show what we know for posterity */
 519         c16 = __va(efi.systab->fw_vendor);
 520         if (c16) {
 521                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 522                         vendor[i] = *c16++;
 523                 vendor[i] = '\0';
 524         }
 525
 526         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 527                efi.systab->hdr.revision >> 16,
 528                efi.systab->hdr.revision & 0xffff, vendor);
 529
 530         efi.mps        = EFI_INVALID_TABLE_ADDR;
 531         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 532         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 533         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 534         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 535         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 536         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 537         efi.uga        = EFI_INVALID_TABLE_ADDR;
 538
 539         palo_phys      = EFI_INVALID_TABLE_ADDR;
 540
 541         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 542                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 543                         efi.mps = config_tables[i].table;
 544                         printk(" MPS=0x%lx", config_tables[i].table);
 545                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 546                         efi.acpi20 = config_tables[i].table;
 547                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 548                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 549                         efi.acpi = config_tables[i].table;
 550                         printk(" ACPI=0x%lx", config_tables[i].table);
 551                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 552                         efi.smbios = config_tables[i].table;
 553                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 554                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 555                         efi.sal_systab = config_tables[i].table;
 556                         printk(" SALsystab=0x%lx", config_tables[i].table);
 557                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 558                         efi.hcdp = config_tables[i].table;
 559                         printk(" HCDP=0x%lx", config_tables[i].table);
 560                 } else if (efi_guidcmp(config_tables[i].guid,
 561                          PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID) == 0) {
 562                         palo_phys = config_tables[i].table;
 563                         printk(" PALO=0x%lx", config_tables[i].table);
 564                 }
 565         }
 566         printk("\n");
 567
 568         if (palo_phys != EFI_INVALID_TABLE_ADDR)
 569                 handle_palo(palo_phys);
 570
 571         runtime = __va(efi.systab->runtime);
 572         efi.get_time = phys_get_time;
 573         efi.set_time = phys_set_time;
 574         efi.get_wakeup_time = phys_get_wakeup_time;
 575         efi.set_wakeup_time = phys_set_wakeup_time;
 576         efi.get_variable = phys_get_variable;
 577         efi.get_next_variable = phys_get_next_variable;
 578         efi.set_variable = phys_set_variable;
 579         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 580         efi.reset_system = phys_reset_system;
 581
 582         efi_map_start = __va(ia64_boot_param->efi_memmap);
 583         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 584         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 585
 586 #if EFI_DEBUG
 587         /* print EFI memory map: */
 588         {
 589                 efi_memory_desc_t *md;
 590                 void *p;
 591
 592                 for (i = 0, p = efi_map_start; p < efi_map_end;
 593                      ++i, p += efi_desc_size)
 594                 {
 595                         const char *unit;
 596                         unsigned long size;
 597
 598                         md = p;
 599                         size = md->num_pages << EFI_PAGE_SHIFT;
 600
 601                         if ((size >> 40) > 0) {
 602                                 size >>= 40;
 603                                 unit = "TB";
 604                         } else if ((size >> 30) > 0) {
 605                                 size >>= 30;
 606                                 unit = "GB";
 607                         } else if ((size >> 20) > 0) {
 608                                 size >>= 20;
 609                                 unit = "MB";
 610                         } else {
 611                                 size >>= 10;
 612                                 unit = "KB";
 613                         }
 614
 615                         printk("mem%02d: type=%2u, attr=0x%016lx, "
 616                                "range=[0x%016lx-0x%016lx) (%4lu%s)\n",
 617                                i, md->type, md->attribute, md->phys_addr,
 618                                md->phys_addr + efi_md_size(md), size, unit);
 619                 }
 620         }
 621 #endif
 622
 623         efi_map_pal_code();
 624         efi_enter_virtual_mode();
 625 }
 626
 627 void
 628 efi_enter_virtual_mode (void)
 629 {
 630         void *efi_map_start, *efi_map_end, *p;
 631         efi_memory_desc_t *md;
 632         efi_status_t status;
 633         u64 efi_desc_size;
 634
 635         efi_map_start = __va(ia64_boot_param->efi_memmap);
 636         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 637         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 638
 639         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 640                 md = p;
 641                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 642                         /*
 643                          * Some descriptors have multiple bits set, so the
 644                          * order of the tests is relevant.
 645                          */
 646                         if (md->attribute & EFI_MEMORY_WB) {
 647                                 md->virt_addr = (u64) __va(md->phys_addr);
 648                         } else if (md->attribute & EFI_MEMORY_UC) {
 649                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 650                         } else if (md->attribute & EFI_MEMORY_WC) {
 651 #if 0
 652                                 md->virt_addr = ia64_remap(md->phys_addr,
 653                                                            (_PAGE_A |
 654                                                             _PAGE_P |
 655                                                             _PAGE_D |
 656                                                             _PAGE_MA_WC |
 657                                                             _PAGE_PL_0 |
 658                                                             _PAGE_AR_RW));
 659 #else
 660                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 661                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 662 #endif
 663                         } else if (md->attribute & EFI_MEMORY_WT) {
 664 #if 0
 665                                 md->virt_addr = ia64_remap(md->phys_addr,
 666                                                            (_PAGE_A |
 667                                                             _PAGE_P |
 668                                                             _PAGE_D |
 669                                                             _PAGE_MA_WT |
 670                                                             _PAGE_PL_0 |
 671                                                             _PAGE_AR_RW));
 672 #else
 673                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 674                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 675 #endif
 676                         }
 677                 }
 678         }
 679
 680         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 681                                ia64_boot_param->efi_memmap_size,
 682                                efi_desc_size,
 683                                ia64_boot_param->efi_memdesc_version,
 684                                ia64_boot_param->efi_memmap);
 685         if (status != EFI_SUCCESS) {
 686                 printk(KERN_WARNING "warning: unable to switch EFI into "
 687                        "virtual mode (status=%lu)\n", status);
 688                 return;
 689         }
 690
 691         /*
 692          * Now that EFI is in virtual mode, we call the EFI functions more
 693          * efficiently:
 694          */
 695         efi.get_time = virt_get_time;
 696         efi.set_time = virt_set_time;
 697         efi.get_wakeup_time = virt_get_wakeup_time;
 698         efi.set_wakeup_time = virt_set_wakeup_time;
 699         efi.get_variable = virt_get_variable;
 700         efi.get_next_variable = virt_get_next_variable;
 701         efi.set_variable = virt_set_variable;
 702         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 703         efi.reset_system = virt_reset_system;
 704 }
 705
 706 /*
 707  * Walk the EFI memory map looking for the I/O port range.  There can only be
 708  * one entry of this type, other I/O port ranges should be described via ACPI.
 709  */
 710 u64
 711 efi_get_iobase (void)
 712 {
 713         void *efi_map_start, *efi_map_end, *p;
 714         efi_memory_desc_t *md;
 715         u64 efi_desc_size;
 716
 717         efi_map_start = __va(ia64_boot_param->efi_memmap);
 718         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 719         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 720
 721         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 722                 md = p;
 723                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 724                         if (md->attribute & EFI_MEMORY_UC)
 725                                 return md->phys_addr;
 726                 }
 727         }
 728         return 0;
 729 }
 730
 731 static struct kern_memdesc *
 732 kern_memory_descriptor (unsigned long phys_addr)
 733 {
 734         struct kern_memdesc *md;
 735
 736         for (md = kern_memmap; md->start != ~0UL; md++) {
 737                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 738                          return md;
 739         }
 740         return NULL;
 741 }
 742
 743 static efi_memory_desc_t *
 744 efi_memory_descriptor (unsigned long phys_addr)
 745 {
 746         void *efi_map_start, *efi_map_end, *p;
 747         efi_memory_desc_t *md;
 748         u64 efi_desc_size;
 749
 750         efi_map_start = __va(ia64_boot_param->efi_memmap);
 751         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 752         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 753
 754         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 755                 md = p;
 756
 757                 if (phys_addr - md->phys_addr < efi_md_size(md))
 758                          return md;
 759         }
 760         return NULL;
 761 }
 762
 763 static int
 764 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 765 {
 766         void *efi_map_start, *efi_map_end, *p;
 767         efi_memory_desc_t *md;
 768         u64 efi_desc_size;
 769         unsigned long end;
 770
 771         efi_map_start = __va(ia64_boot_param->efi_memmap);
 772         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 773         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 774
 775         end = phys_addr + size;
 776
 777         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 778                 md = p;
 779                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 780                         return 1;
 781         }
 782         return 0;
 783 }
 784
 785 u32
 786 efi_mem_type (unsigned long phys_addr)
 787 {
 788         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 789
 790         if (md)
 791                 return md->type;
 792         return 0;
 793 }
 794
 795 u64
 796 efi_mem_attributes (unsigned long phys_addr)
 797 {
 798         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 799
 800         if (md)
 801                 return md->attribute;
 802         return 0;
 803 }
 804 EXPORT_SYMBOL(efi_mem_attributes);
 805
 806 u64
 807 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 808 {
 809         unsigned long end = phys_addr + size;
 810         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 811         u64 attr;
 812
 813         if (!md)
 814                 return 0;
 815
 816         /*
 817          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 818          * the kernel that firmware needs this region mapped.
 819          */
 820         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 821         do {
 822                 unsigned long md_end = efi_md_end(md);
 823
 824                 if (end <= md_end)
 825                         return attr;
 826
 827                 md = efi_memory_descriptor(md_end);
 828                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 829                         return 0;
 830         } while (md);
 831         return 0;       /* never reached */
 832 }
 833
 834 u64
 835 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 836 {
 837         unsigned long end = phys_addr + size;
 838         struct kern_memdesc *md;
 839         u64 attr;
 840
 841         /*
 842          * This is a hack for ioremap calls before we set up kern_memmap.
 843          * Maybe we should do efi_memmap_init() earlier instead.
 844          */
 845         if (!kern_memmap) {
 846                 attr = efi_mem_attribute(phys_addr, size);
 847                 if (attr & EFI_MEMORY_WB)
 848                         return EFI_MEMORY_WB;
 849                 return 0;
 850         }
 851
 852         md = kern_memory_descriptor(phys_addr);
 853         if (!md)
 854                 return 0;
 855
 856         attr = md->attribute;
 857         do {
 858                 unsigned long md_end = kmd_end(md);
 859
 860                 if (end <= md_end)
 861                         return attr;
 862
 863                 md = kern_memory_descriptor(md_end);
 864                 if (!md || md->attribute != attr)
 865                         return 0;
 866         } while (md);
 867         return 0;       /* never reached */
 868 }
 869 EXPORT_SYMBOL(kern_mem_attribute);
 870
 871 int
 872 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 873 {
 874         u64 attr;
 875
 876         /*
 877          * /dev/mem reads and writes use copy_to_user(), which implicitly
 878          * uses a granule-sized kernel identity mapping.  It's really
 879          * only safe to do this for regions in kern_memmap.  For more
 880          * details, see Documentation/ia64/aliasing.txt.
 881          */
 882         attr = kern_mem_attribute(phys_addr, size);
 883         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 884                 return 1;
 885         return 0;
 886 }
 887
 888 int
 889 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 890 {
 891         unsigned long phys_addr = pfn << PAGE_SHIFT;
 892         u64 attr;
 893
 894         attr = efi_mem_attribute(phys_addr, size);
 895
 896         /*
 897          * /dev/mem mmap uses normal user pages, so we don't need the entire
 898          * granule, but the entire region we're mapping must support the same
 899          * attribute.
 900          */
 901         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 902                 return 1;
 903
 904         /*
 905          * Intel firmware doesn't tell us about all the MMIO regions, so
 906          * in general we have to allow mmap requests.  But if EFI *does*
 907          * tell us about anything inside this region, we should deny it.
 908          * The user can always map a smaller region to avoid the overlap.
 909          */
 910         if (efi_memmap_intersects(phys_addr, size))
 911                 return 0;
 912
 913         return 1;
 914 }
 915
 916 pgprot_t
 917 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 918                      pgprot_t vma_prot)
 919 {
 920         unsigned long phys_addr = pfn << PAGE_SHIFT;
 921         u64 attr;
 922
 923         /*
 924          * For /dev/mem mmap, we use user mappings, but if the region is
 925          * in kern_memmap (and hence may be covered by a kernel mapping),
 926          * we must use the same attribute as the kernel mapping.
 927          */
 928         attr = kern_mem_attribute(phys_addr, size);
 929         if (attr & EFI_MEMORY_WB)
 930                 return pgprot_cacheable(vma_prot);
 931         else if (attr & EFI_MEMORY_UC)
 932                 return pgprot_noncached(vma_prot);
 933
 934         /*
 935          * Some chipsets don't support UC access to memory.  If
 936          * WB is supported, we prefer that.
 937          */
 938         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 939                 return pgprot_cacheable(vma_prot);
 940
 941         return pgprot_noncached(vma_prot);
 942 }
 943
 944 int __init
 945 efi_uart_console_only(void)
 946 {
 947         efi_status_t status;
 948         char *s, name[] = "ConOut";
 949         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 950         efi_char16_t *utf16, name_utf16[32];
 951         unsigned char data[1024];
 952         unsigned long size = sizeof(data);
 953         struct efi_generic_dev_path *hdr, *end_addr;
 954         int uart = 0;
 955
 956         /* Convert to UTF-16 */
 957         utf16 = name_utf16;
 958         s = name;
 959         while (*s)
 960                 *utf16++ = *s++ & 0x7f;
 961         *utf16 = 0;
 962
 963         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 964         if (status != EFI_SUCCESS) {
 965                 printk(KERN_ERR "No EFI %s variable?\n", name);
 966                 return 0;
 967         }
 968
 969         hdr = (struct efi_generic_dev_path *) data;
 970         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 971         while (hdr < end_addr) {
 972                 if (hdr->type == EFI_DEV_MSG &&
 973                     hdr->sub_type == EFI_DEV_MSG_UART)
 974                         uart = 1;
 975                 else if (hdr->type == EFI_DEV_END_PATH ||
 976                           hdr->type == EFI_DEV_END_PATH2) {
 977                         if (!uart)
 978                                 return 0;
 979                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 980                                 return 1;
 981                         uart = 0;
 982                 }
 983                 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length);
 984         }
 985         printk(KERN_ERR "Malformed %s value\n", name);
 986         return 0;
 987 }
 988
 989 /*
 990  * Look for the first granule aligned memory descriptor memory
 991  * that is big enough to hold EFI memory map. Make sure this
 992  * descriptor is atleast granule sized so it does not get trimmed
 993  */
 994 struct kern_memdesc *
 995 find_memmap_space (void)
 996 {
 997         u64     contig_low=0, contig_high=0;
 998         u64     as = 0, ae;
 999         void *efi_map_start, *efi_map_end, *p, *q;
1000         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1001         u64     space_needed, efi_desc_size;
1002         unsigned long total_mem = 0;
1003
1004         efi_map_start = __va(ia64_boot_param->efi_memmap);
1005         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1006         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1007
1008         /*
1009          * Worst case: we need 3 kernel descriptors for each efi descriptor
1010          * (if every entry has a WB part in the middle, and UC head and tail),
1011          * plus one for the end marker.
1012          */
1013         space_needed = sizeof(kern_memdesc_t) *
1014                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
1015
1016         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1017                 md = p;
1018                 if (!efi_wb(md)) {
1019                         continue;
1020                 }
1021                 if (pmd == NULL || !efi_wb(pmd) ||
1022                     efi_md_end(pmd) != md->phys_addr) {
1023                         contig_low = GRANULEROUNDUP(md->phys_addr);
1024                         contig_high = efi_md_end(md);
1025                         for (q = p + efi_desc_size; q < efi_map_end;
1026                              q += efi_desc_size) {
1027                                 check_md = q;
1028                                 if (!efi_wb(check_md))
1029                                         break;
1030                                 if (contig_high != check_md->phys_addr)
1031                                         break;
1032                                 contig_high = efi_md_end(check_md);
1033                         }
1034                         contig_high = GRANULEROUNDDOWN(contig_high);
1035                 }
1036                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
1037                         continue;
1038
1039                 /* Round ends inward to granule boundaries */
1040                 as = max(contig_low, md->phys_addr);
1041                 ae = min(contig_high, efi_md_end(md));
1042
1043                 /* keep within max_addr= and min_addr= command line arg */
1044                 as = max(as, min_addr);
1045                 ae = min(ae, max_addr);
1046                 if (ae <= as)
1047                         continue;
1048
1049                 /* avoid going over mem= command line arg */
1050                 if (total_mem + (ae - as) > mem_limit)
1051                         ae -= total_mem + (ae - as) - mem_limit;
1052
1053                 if (ae <= as)
1054                         continue;
1055
1056                 if (ae - as > space_needed)
1057                         break;
1058         }
1059         if (p >= efi_map_end)
1060                 panic("Can't allocate space for kernel memory descriptors");
1061
1062         return __va(as);
1063 }
1064
1065 /*
1066  * Walk the EFI memory map and gather all memory available for kernel
1067  * to use.  We can allocate partial granules only if the unavailable
1068  * parts exist, and are WB.
1069  */
1070 unsigned long
1071 efi_memmap_init(u64 *s, u64 *e)
1072 {
1073         struct kern_memdesc *k, *prev = NULL;
1074         u64     contig_low=0, contig_high=0;
1075         u64     as, ae, lim;
1076         void *efi_map_start, *efi_map_end, *p, *q;
1077         efi_memory_desc_t *md, *pmd = NULL, *check_md;
1078         u64     efi_desc_size;
1079         unsigned long total_mem = 0;
1080
1081         k = kern_memmap = find_memmap_space();
1082
1083         efi_map_start = __va(ia64_boot_param->efi_memmap);
1084         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1085         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1086
1087         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
1088                 md = p;
1089                 if (!efi_wb(md)) {
1090                         if (efi_uc(md) &&
1091                             (md->type == EFI_CONVENTIONAL_MEMORY ||
1092                              md->type == EFI_BOOT_SERVICES_DATA)) {
1093                                 k->attribute = EFI_MEMORY_UC;
1094                                 k->start = md->phys_addr;
1095                                 k->num_pages = md->num_pages;
1096                                 k++;
1097                         }
1098                         continue;
1099                 }
1100                 if (pmd == NULL || !efi_wb(pmd) ||
1101                     efi_md_end(pmd) != md->phys_addr) {
1102                         contig_low = GRANULEROUNDUP(md->phys_addr);
1103                         contig_high = efi_md_end(md);
1104                         for (q = p + efi_desc_size; q < efi_map_end;
1105                              q += efi_desc_size) {
1106                                 check_md = q;
1107                                 if (!efi_wb(check_md))
1108                                         break;
1109                                 if (contig_high != check_md->phys_addr)
1110                                         break;
1111                                 contig_high = efi_md_end(check_md);
1112                         }
1113                         contig_high = GRANULEROUNDDOWN(contig_high);
1114                 }
1115                 if (!is_memory_available(md))
1116                         continue;
1117
1118 #ifdef CONFIG_CRASH_DUMP
1119                 /* saved_max_pfn should ignore max_addr= command line arg */
1120                 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1121                         saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1122 #endif
1123                 /*
1124                  * Round ends inward to granule boundaries
1125                  * Give trimmings to uncached allocator
1126                  */
1127                 if (md->phys_addr < contig_low) {
1128                         lim = min(efi_md_end(md), contig_low);
1129                         if (efi_uc(md)) {
1130                                 if (k > kern_memmap &&
1131                                     (k-1)->attribute == EFI_MEMORY_UC &&
1132                                     kmd_end(k-1) == md->phys_addr) {
1133                                         (k-1)->num_pages +=
1134                                                 (lim - md->phys_addr)
1135                                                 >> EFI_PAGE_SHIFT;
1136                                 } else {
1137                                         k->attribute = EFI_MEMORY_UC;
1138                                         k->start = md->phys_addr;
1139                                         k->num_pages = (lim - md->phys_addr)
1140                                                 >> EFI_PAGE_SHIFT;
1141                                         k++;
1142                                 }
1143                         }
1144                         as = contig_low;
1145                 } else
1146                         as = md->phys_addr;
1147
1148                 if (efi_md_end(md) > contig_high) {
1149                         lim = max(md->phys_addr, contig_high);
1150                         if (efi_uc(md)) {
1151                                 if (lim == md->phys_addr && k > kern_memmap &&
1152                                     (k-1)->attribute == EFI_MEMORY_UC &&
1153                                     kmd_end(k-1) == md->phys_addr) {
1154                                         (k-1)->num_pages += md->num_pages;
1155                                 } else {
1156                                         k->attribute = EFI_MEMORY_UC;
1157                                         k->start = lim;
1158                                         k->num_pages = (efi_md_end(md) - lim)
1159                                                 >> EFI_PAGE_SHIFT;
1160                                         k++;
1161                                 }
1162                         }
1163                         ae = contig_high;
1164                 } else
1165                         ae = efi_md_end(md);
1166
1167                 /* keep within max_addr= and min_addr= command line arg */
1168                 as = max(as, min_addr);
1169                 ae = min(ae, max_addr);
1170                 if (ae <= as)
1171                         continue;
1172
1173                 /* avoid going over mem= command line arg */
1174                 if (total_mem + (ae - as) > mem_limit)
1175                         ae -= total_mem + (ae - as) - mem_limit;
1176
1177                 if (ae <= as)
1178                         continue;
1179                 if (prev && kmd_end(prev) == md->phys_addr) {
1180                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1181                         total_mem += ae - as;
1182                         continue;
1183                 }
1184                 k->attribute = EFI_MEMORY_WB;
1185                 k->start = as;
1186                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1187                 total_mem += ae - as;
1188                 prev = k++;
1189         }
1190         k->start = ~0L; /* end-marker */
1191
1192         /* reserve the memory we are using for kern_memmap */
1193         *s = (u64)kern_memmap;
1194         *e = (u64)++k;
1195
1196         return total_mem;
1197 }
1198
1199 void
1200 efi_initialize_iomem_resources(struct resource *code_resource,
1201                                struct resource *data_resource,
1202                                struct resource *bss_resource)
1203 {
1204         struct resource *res;
1205         void *efi_map_start, *efi_map_end, *p;
1206         efi_memory_desc_t *md;
1207         u64 efi_desc_size;
1208         char *name;
1209         unsigned long flags;
1210
1211         efi_map_start = __va(ia64_boot_param->efi_memmap);
1212         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1213         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1214
1215         res = NULL;
1216
1217         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1218                 md = p;
1219
1220                 if (md->num_pages == 0) /* should not happen */
1221                         continue;
1222
1223                 flags = IORESOURCE_MEM | IORESOURCE_BUSY;
1224                 switch (md->type) {
1225
1226                         case EFI_MEMORY_MAPPED_IO:
1227                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1228                                 continue;
1229
1230                         case EFI_LOADER_CODE:
1231                         case EFI_LOADER_DATA:
1232                         case EFI_BOOT_SERVICES_DATA:
1233                         case EFI_BOOT_SERVICES_CODE:
1234                         case EFI_CONVENTIONAL_MEMORY:
1235                                 if (md->attribute & EFI_MEMORY_WP) {
1236                                         name = "System ROM";
1237                                         flags |= IORESOURCE_READONLY;
1238                                 } else if (md->attribute == EFI_MEMORY_UC)
1239                                         name = "Uncached RAM";
1240                                 else
1241                                         name = "System RAM";
1242                                 break;
1243
1244                         case EFI_ACPI_MEMORY_NVS:
1245                                 name = "ACPI Non-volatile Storage";
1246                                 break;
1247
1248                         case EFI_UNUSABLE_MEMORY:
1249                                 name = "reserved";
1250                                 flags |= IORESOURCE_DISABLED;
1251                                 break;
1252
1253                         case EFI_RESERVED_TYPE:
1254                         case EFI_RUNTIME_SERVICES_CODE:
1255                         case EFI_RUNTIME_SERVICES_DATA:
1256                         case EFI_ACPI_RECLAIM_MEMORY:
1257                         default:
1258                                 name = "reserved";
1259                                 break;
1260                 }
1261
1262                 if ((res = kzalloc(sizeof(struct resource),
1263                                    GFP_KERNEL)) == NULL) {
1264                         printk(KERN_ERR
1265                                "failed to allocate resource for iomem\n");
1266                         return;
1267                 }
1268
1269                 res->name = name;
1270                 res->start = md->phys_addr;
1271                 res->end = md->phys_addr + efi_md_size(md) - 1;
1272                 res->flags = flags;
1273
1274                 if (insert_resource(&iomem_resource, res) < 0)
1275                         kfree(res);
1276                 else {
1277                         /*
1278                          * We don't know which region contains
1279                          * kernel data so we try it repeatedly and
1280                          * let the resource manager test it.
1281                          */
1282                         insert_resource(res, code_resource);
1283                         insert_resource(res, data_resource);
1284                         insert_resource(res, bss_resource);
1285 #ifdef CONFIG_KEXEC
1286                         insert_resource(res, &efi_memmap_res);
1287                         insert_resource(res, &boot_param_res);
1288                         if (crashk_res.end > crashk_res.start)
1289                                 insert_resource(res, &crashk_res);
1290 #endif
1291                 }
1292         }
1293 }
1294
1295 #ifdef CONFIG_KEXEC
1296 /* find a block of memory aligned to 64M exclude reserved regions
1297    rsvd_regions are sorted
1298  */
1299 unsigned long __init
1300 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n)
1301 {
1302         int i;
1303         u64 start, end;
1304         u64 alignment = 1UL << _PAGE_SIZE_64M;
1305         void *efi_map_start, *efi_map_end, *p;
1306         efi_memory_desc_t *md;
1307         u64 efi_desc_size;
1308
1309         efi_map_start = __va(ia64_boot_param->efi_memmap);
1310         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1311         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1312
1313         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1314                 md = p;
1315                 if (!efi_wb(md))
1316                         continue;
1317                 start = ALIGN(md->phys_addr, alignment);
1318                 end = efi_md_end(md);
1319                 for (i = 0; i < n; i++) {
1320                         if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1321                                 if (__pa(r[i].start) > start + size)
1322                                         return start;
1323                                 start = ALIGN(__pa(r[i].end), alignment);
1324                                 if (i < n-1 &&
1325                                     __pa(r[i+1].start) < start + size)
1326                                         continue;
1327                                 else
1328                                         break;
1329                         }
1330                 }
1331                 if (end > start + size)
1332                         return start;
1333         }
1334
1335         printk(KERN_WARNING
1336                "Cannot reserve 0x%lx byte of memory for crashdump\n", size);
1337         return ~0UL;
1338 }
1339 #endif
1340
1341 #ifdef CONFIG_CRASH_DUMP
1342 /* locate the size find a the descriptor at a certain address */
1343 unsigned long __init
1344 vmcore_find_descriptor_size (unsigned long address)
1345 {
1346         void *efi_map_start, *efi_map_end, *p;
1347         efi_memory_desc_t *md;
1348         u64 efi_desc_size;
1349         unsigned long ret = 0;
1350
1351         efi_map_start = __va(ia64_boot_param->efi_memmap);
1352         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1353         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1354
1355         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1356                 md = p;
1357                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1358                     && md->phys_addr == address) {
1359                         ret = efi_md_size(md);
1360                         break;
1361                 }
1362         }
1363
1364         if (ret == 0)
1365                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1366
1367         return ret;
1368 }
1369 #endif