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