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