arch/ia64/kernel/efi.c

   1 /*
   2  * Extensible Firmware Interface
   3  *
   4  * Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
   5  *
   6  * Copyright (C) 1999 VA Linux Systems
   7  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   8  * Copyright (C) 1999-2003 Hewlett-Packard Co.
   9  *      David Mosberger-Tang <davidm@hpl.hp.com>
  10  *      Stephane Eranian <eranian@hpl.hp.com>
  11  * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
  12  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  13  *
  14  * All EFI Runtime Services are not implemented yet as EFI only
  15  * supports physical mode addressing on SoftSDV. This is to be fixed
  16  * in a future version.  --drummond 1999-07-20
  17  *
  18  * Implemented EFI runtime services and virtual mode calls.  --davidm
  19  *
  20  * Goutham Rao: <goutham.rao@intel.com>
  21  *      Skip non-WB memory and ignore empty memory ranges.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/types.h>
  28 #include <linux/time.h>
  29 #include <linux/efi.h>
  30 #include <linux/kexec.h>
  31 #include <linux/mm.h>
  32
  33 #include <asm/io.h>
  34 #include <asm/kregs.h>
  35 #include <asm/meminit.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/processor.h>
  38 #include <asm/mca.h>
  39
  40 #define EFI_DEBUG       0
  41
  42 extern efi_status_t efi_call_phys (void *, ...);
  43
  44 struct efi efi;
  45 EXPORT_SYMBOL(efi);
  46 static efi_runtime_services_t *runtime;
  47 static unsigned long mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
  48
  49 #define efi_call_virt(f, args...)       (*(f))(args)
  50
  51 #define STUB_GET_TIME(prefix, adjust_arg)                                                         \
  52 static efi_status_t                                                                               \
  53 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                            \
  54 {                                                                                                 \
  55         struct ia64_fpreg fr[6];                                                                  \
  56         efi_time_cap_t *atc = NULL;                                                               \
  57         efi_status_t ret;                                                                         \
  58                                                                                                   \
  59         if (tc)                                                                                   \
  60                 atc = adjust_arg(tc);                                                             \
  61         ia64_save_scratch_fpregs(fr);                                                             \
  62         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
  63         ia64_load_scratch_fpregs(fr);                                                             \
  64         return ret;                                                                               \
  65 }
  66
  67 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  68 static efi_status_t                                                                             \
  69 prefix##_set_time (efi_time_t *tm)                                                              \
  70 {                                                                                               \
  71         struct ia64_fpreg fr[6];                                                                \
  72         efi_status_t ret;                                                                       \
  73                                                                                                 \
  74         ia64_save_scratch_fpregs(fr);                                                           \
  75         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  76         ia64_load_scratch_fpregs(fr);                                                           \
  77         return ret;                                                                             \
  78 }
  79
  80 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  81 static efi_status_t                                                                             \
  82 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  83 {                                                                                               \
  84         struct ia64_fpreg fr[6];                                                                \
  85         efi_status_t ret;                                                                       \
  86                                                                                                 \
  87         ia64_save_scratch_fpregs(fr);                                                           \
  88         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  89                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  90         ia64_load_scratch_fpregs(fr);                                                           \
  91         return ret;                                                                             \
  92 }
  93
  94 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  95 static efi_status_t                                                                             \
  96 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
  97 {                                                                                               \
  98         struct ia64_fpreg fr[6];                                                                \
  99         efi_time_t *atm = NULL;                                                                 \
 100         efi_status_t ret;                                                                       \
 101                                                                                                 \
 102         if (tm)                                                                                 \
 103                 atm = adjust_arg(tm);                                                           \
 104         ia64_save_scratch_fpregs(fr);                                                           \
 105         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 106                                 enabled, atm);                                                  \
 107         ia64_load_scratch_fpregs(fr);                                                           \
 108         return ret;                                                                             \
 109 }
 110
 111 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 112 static efi_status_t                                                                     \
 113 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 114                        unsigned long *data_size, void *data)                            \
 115 {                                                                                       \
 116         struct ia64_fpreg fr[6];                                                        \
 117         u32 *aattr = NULL;                                                                      \
 118         efi_status_t ret;                                                               \
 119                                                                                         \
 120         if (attr)                                                                       \
 121                 aattr = adjust_arg(attr);                                               \
 122         ia64_save_scratch_fpregs(fr);                                                   \
 123         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 124                                 adjust_arg(name), adjust_arg(vendor), aattr,            \
 125                                 adjust_arg(data_size), adjust_arg(data));               \
 126         ia64_load_scratch_fpregs(fr);                                                   \
 127         return ret;                                                                     \
 128 }
 129
 130 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 131 static efi_status_t                                                                             \
 132 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 133 {                                                                                               \
 134         struct ia64_fpreg fr[6];                                                                \
 135         efi_status_t ret;                                                                       \
 136                                                                                                 \
 137         ia64_save_scratch_fpregs(fr);                                                           \
 138         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 139                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 140         ia64_load_scratch_fpregs(fr);                                                           \
 141         return ret;                                                                             \
 142 }
 143
 144 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 145 static efi_status_t                                                                     \
 146 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr,      \
 147                        unsigned long data_size, void *data)                             \
 148 {                                                                                       \
 149         struct ia64_fpreg fr[6];                                                        \
 150         efi_status_t ret;                                                               \
 151                                                                                         \
 152         ia64_save_scratch_fpregs(fr);                                                   \
 153         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 154                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 155                                 adjust_arg(data));                                      \
 156         ia64_load_scratch_fpregs(fr);                                                   \
 157         return ret;                                                                     \
 158 }
 159
 160 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 161 static efi_status_t                                                                             \
 162 prefix##_get_next_high_mono_count (u32 *count)                                                  \
 163 {                                                                                               \
 164         struct ia64_fpreg fr[6];                                                                \
 165         efi_status_t ret;                                                                       \
 166                                                                                                 \
 167         ia64_save_scratch_fpregs(fr);                                                           \
 168         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 169                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 170         ia64_load_scratch_fpregs(fr);                                                           \
 171         return ret;                                                                             \
 172 }
 173
 174 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 175 static void                                                                     \
 176 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 177                        unsigned long data_size, efi_char16_t *data)             \
 178 {                                                                               \
 179         struct ia64_fpreg fr[6];                                                \
 180         efi_char16_t *adata = NULL;                                             \
 181                                                                                 \
 182         if (data)                                                               \
 183                 adata = adjust_arg(data);                                       \
 184                                                                                 \
 185         ia64_save_scratch_fpregs(fr);                                           \
 186         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 187                           reset_type, status, data_size, adata);                \
 188         /* should not return, but just in case... */                            \
 189         ia64_load_scratch_fpregs(fr);                                           \
 190 }
 191
 192 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 193
 194 STUB_GET_TIME(phys, phys_ptr)
 195 STUB_SET_TIME(phys, phys_ptr)
 196 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 197 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 198 STUB_GET_VARIABLE(phys, phys_ptr)
 199 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 200 STUB_SET_VARIABLE(phys, phys_ptr)
 201 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 202 STUB_RESET_SYSTEM(phys, phys_ptr)
 203
 204 #define id(arg) arg
 205
 206 STUB_GET_TIME(virt, id)
 207 STUB_SET_TIME(virt, id)
 208 STUB_GET_WAKEUP_TIME(virt, id)
 209 STUB_SET_WAKEUP_TIME(virt, id)
 210 STUB_GET_VARIABLE(virt, id)
 211 STUB_GET_NEXT_VARIABLE(virt, id)
 212 STUB_SET_VARIABLE(virt, id)
 213 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 214 STUB_RESET_SYSTEM(virt, id)
 215
 216 void
 217 efi_gettimeofday (struct timespec *ts)
 218 {
 219         efi_time_t tm;
 220
 221         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) {
 222                 memset(ts, 0, sizeof(*ts));
 223                 return;
 224         }
 225
 226         ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 227         ts->tv_nsec = tm.nanosecond;
 228 }
 229
 230 static int
 231 is_memory_available (efi_memory_desc_t *md)
 232 {
 233         if (!(md->attribute & EFI_MEMORY_WB))
 234                 return 0;
 235
 236         switch (md->type) {
 237               case EFI_LOADER_CODE:
 238               case EFI_LOADER_DATA:
 239               case EFI_BOOT_SERVICES_CODE:
 240               case EFI_BOOT_SERVICES_DATA:
 241               case EFI_CONVENTIONAL_MEMORY:
 242                 return 1;
 243         }
 244         return 0;
 245 }
 246
 247 typedef struct kern_memdesc {
 248         u64 attribute;
 249         u64 start;
 250         u64 num_pages;
 251 } kern_memdesc_t;
 252
 253 static kern_memdesc_t *kern_memmap;
 254
 255 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
 256
 257 static inline u64
 258 kmd_end(kern_memdesc_t *kmd)
 259 {
 260         return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
 261 }
 262
 263 static inline u64
 264 efi_md_end(efi_memory_desc_t *md)
 265 {
 266         return (md->phys_addr + efi_md_size(md));
 267 }
 268
 269 static inline int
 270 efi_wb(efi_memory_desc_t *md)
 271 {
 272         return (md->attribute & EFI_MEMORY_WB);
 273 }
 274
 275 static inline int
 276 efi_uc(efi_memory_desc_t *md)
 277 {
 278         return (md->attribute & EFI_MEMORY_UC);
 279 }
 280
 281 static void
 282 walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 283 {
 284         kern_memdesc_t *k;
 285         u64 start, end, voff;
 286
 287         voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
 288         for (k = kern_memmap; k->start != ~0UL; k++) {
 289                 if (k->attribute != attr)
 290                         continue;
 291                 start = PAGE_ALIGN(k->start);
 292                 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
 293                 if (start < end)
 294                         if ((*callback)(start + voff, end + voff, arg) < 0)
 295                                 return;
 296         }
 297 }
 298
 299 /*
 300  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 301  * has memory that is available for OS use.
 302  */
 303 void
 304 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 305 {
 306         walk(callback, arg, EFI_MEMORY_WB);
 307 }
 308
 309 /*
 310  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 311  * has memory that is available for uncached allocator.
 312  */
 313 void
 314 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
 315 {
 316         walk(callback, arg, EFI_MEMORY_UC);
 317 }
 318
 319 /*
 320  * Look for the PAL_CODE region reported by EFI and maps it using an
 321  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 322  * Abstraction Layer chapter 11 in ADAG
 323  */
 324
 325 void *
 326 efi_get_pal_addr (void)
 327 {
 328         void *efi_map_start, *efi_map_end, *p;
 329         efi_memory_desc_t *md;
 330         u64 efi_desc_size;
 331         int pal_code_count = 0;
 332         u64 vaddr, mask;
 333
 334         efi_map_start = __va(ia64_boot_param->efi_memmap);
 335         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 336         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 337
 338         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 339                 md = p;
 340                 if (md->type != EFI_PAL_CODE)
 341                         continue;
 342
 343                 if (++pal_code_count > 1) {
 344                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 345                                md->phys_addr);
 346                         continue;
 347                 }
 348                 /*
 349                  * The only ITLB entry in region 7 that is used is the one installed by
 350                  * __start().  That entry covers a 64MB range.
 351                  */
 352                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 353                 vaddr = PAGE_OFFSET + md->phys_addr;
 354
 355                 /*
 356                  * We must check that the PAL mapping won't overlap with the kernel
 357                  * mapping.
 358                  *
 359                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 360                  * 256KB and that only one ITR is needed to map it. This implies that the
 361                  * PAL code is always aligned on its size, i.e., the closest matching page
 362                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 363                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 364                  * now the following test is enough to determine whether or not we need a
 365                  * dedicated ITR for the PAL code.
 366                  */
 367                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 368                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 369                                __FUNCTION__);
 370                         continue;
 371                 }
 372
 373                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 374                         panic("Woah!  PAL code size bigger than a granule!");
 375
 376 #if EFI_DEBUG
 377                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 378
 379                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 380                         smp_processor_id(), md->phys_addr,
 381                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 382                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 383 #endif
 384                 return __va(md->phys_addr);
 385         }
 386         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n",
 387                __FUNCTION__);
 388         return NULL;
 389 }
 390
 391 void
 392 efi_map_pal_code (void)
 393 {
 394         void *pal_vaddr = efi_get_pal_addr ();
 395         u64 psr;
 396
 397         if (!pal_vaddr)
 398                 return;
 399
 400         /*
 401          * Cannot write to CRx with PSR.ic=1
 402          */
 403         psr = ia64_clear_ic();
 404         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 405                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 406                  IA64_GRANULE_SHIFT);
 407         ia64_set_psr(psr);              /* restore psr */
 408         ia64_srlz_i();
 409 }
 410
 411 void __init
 412 efi_init (void)
 413 {
 414         void *efi_map_start, *efi_map_end;
 415         efi_config_table_t *config_tables;
 416         efi_char16_t *c16;
 417         u64 efi_desc_size;
 418         char *cp, vendor[100] = "unknown";
 419         int i;
 420
 421         /* it's too early to be able to use the standard kernel command line support... */
 422         for (cp = boot_command_line; *cp; ) {
 423                 if (memcmp(cp, "mem=", 4) == 0) {
 424                         mem_limit = memparse(cp + 4, &cp);
 425                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 426                         max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 427                 } else if (memcmp(cp, "min_addr=", 9) == 0) {
 428                         min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
 429                 } else {
 430                         while (*cp != ' ' && *cp)
 431                                 ++cp;
 432                         while (*cp == ' ')
 433                                 ++cp;
 434                 }
 435         }
 436         if (min_addr != 0UL)
 437                 printk(KERN_INFO "Ignoring memory below %luMB\n", min_addr >> 20);
 438         if (max_addr != ~0UL)
 439                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 440
 441         efi.systab = __va(ia64_boot_param->efi_systab);
 442
 443         /*
 444          * Verify the EFI Table
 445          */
 446         if (efi.systab == NULL)
 447                 panic("Woah! Can't find EFI system table.\n");
 448         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 449                 panic("Woah! EFI system table signature incorrect\n");
 450         if ((efi.systab->hdr.revision >> 16) == 0)
 451                 printk(KERN_WARNING "Warning: EFI system table version "
 452                        "%d.%02d, expected 1.00 or greater\n",
 453                        efi.systab->hdr.revision >> 16,
 454                        efi.systab->hdr.revision & 0xffff);
 455
 456         config_tables = __va(efi.systab->tables);
 457
 458         /* Show what we know for posterity */
 459         c16 = __va(efi.systab->fw_vendor);
 460         if (c16) {
 461                 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
 462                         vendor[i] = *c16++;
 463                 vendor[i] = '\0';
 464         }
 465
 466         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 467                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 468
 469         efi.mps        = EFI_INVALID_TABLE_ADDR;
 470         efi.acpi       = EFI_INVALID_TABLE_ADDR;
 471         efi.acpi20     = EFI_INVALID_TABLE_ADDR;
 472         efi.smbios     = EFI_INVALID_TABLE_ADDR;
 473         efi.sal_systab = EFI_INVALID_TABLE_ADDR;
 474         efi.boot_info  = EFI_INVALID_TABLE_ADDR;
 475         efi.hcdp       = EFI_INVALID_TABLE_ADDR;
 476         efi.uga        = EFI_INVALID_TABLE_ADDR;
 477
 478         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 479                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 480                         efi.mps = config_tables[i].table;
 481                         printk(" MPS=0x%lx", config_tables[i].table);
 482                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 483                         efi.acpi20 = config_tables[i].table;
 484                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 485                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 486                         efi.acpi = config_tables[i].table;
 487                         printk(" ACPI=0x%lx", config_tables[i].table);
 488                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 489                         efi.smbios = config_tables[i].table;
 490                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 491                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 492                         efi.sal_systab = config_tables[i].table;
 493                         printk(" SALsystab=0x%lx", config_tables[i].table);
 494                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 495                         efi.hcdp = config_tables[i].table;
 496                         printk(" HCDP=0x%lx", config_tables[i].table);
 497                 }
 498         }
 499         printk("\n");
 500
 501         runtime = __va(efi.systab->runtime);
 502         efi.get_time = phys_get_time;
 503         efi.set_time = phys_set_time;
 504         efi.get_wakeup_time = phys_get_wakeup_time;
 505         efi.set_wakeup_time = phys_set_wakeup_time;
 506         efi.get_variable = phys_get_variable;
 507         efi.get_next_variable = phys_get_next_variable;
 508         efi.set_variable = phys_set_variable;
 509         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 510         efi.reset_system = phys_reset_system;
 511
 512         efi_map_start = __va(ia64_boot_param->efi_memmap);
 513         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 514         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 515
 516 #if EFI_DEBUG
 517         /* print EFI memory map: */
 518         {
 519                 efi_memory_desc_t *md;
 520                 void *p;
 521
 522                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 523                         md = p;
 524                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 525                                i, md->type, md->attribute, md->phys_addr,
 526                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 527                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 528                 }
 529         }
 530 #endif
 531
 532         efi_map_pal_code();
 533         efi_enter_virtual_mode();
 534 }
 535
 536 void
 537 efi_enter_virtual_mode (void)
 538 {
 539         void *efi_map_start, *efi_map_end, *p;
 540         efi_memory_desc_t *md;
 541         efi_status_t status;
 542         u64 efi_desc_size;
 543
 544         efi_map_start = __va(ia64_boot_param->efi_memmap);
 545         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 546         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 547
 548         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 549                 md = p;
 550                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 551                         /*
 552                          * Some descriptors have multiple bits set, so the order of
 553                          * the tests is relevant.
 554                          */
 555                         if (md->attribute & EFI_MEMORY_WB) {
 556                                 md->virt_addr = (u64) __va(md->phys_addr);
 557                         } else if (md->attribute & EFI_MEMORY_UC) {
 558                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 559                         } else if (md->attribute & EFI_MEMORY_WC) {
 560 #if 0
 561                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 562                                                                            | _PAGE_D
 563                                                                            | _PAGE_MA_WC
 564                                                                            | _PAGE_PL_0
 565                                                                            | _PAGE_AR_RW));
 566 #else
 567                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 568                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 569 #endif
 570                         } else if (md->attribute & EFI_MEMORY_WT) {
 571 #if 0
 572                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 573                                                                            | _PAGE_D | _PAGE_MA_WT
 574                                                                            | _PAGE_PL_0
 575                                                                            | _PAGE_AR_RW));
 576 #else
 577                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 578                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 579 #endif
 580                         }
 581                 }
 582         }
 583
 584         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 585                                ia64_boot_param->efi_memmap_size,
 586                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 587                                ia64_boot_param->efi_memmap);
 588         if (status != EFI_SUCCESS) {
 589                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 590                        "(status=%lu)\n", status);
 591                 return;
 592         }
 593
 594         /*
 595          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 596          */
 597         efi.get_time = virt_get_time;
 598         efi.set_time = virt_set_time;
 599         efi.get_wakeup_time = virt_get_wakeup_time;
 600         efi.set_wakeup_time = virt_set_wakeup_time;
 601         efi.get_variable = virt_get_variable;
 602         efi.get_next_variable = virt_get_next_variable;
 603         efi.set_variable = virt_set_variable;
 604         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 605         efi.reset_system = virt_reset_system;
 606 }
 607
 608 /*
 609  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 610  * this type, other I/O port ranges should be described via ACPI.
 611  */
 612 u64
 613 efi_get_iobase (void)
 614 {
 615         void *efi_map_start, *efi_map_end, *p;
 616         efi_memory_desc_t *md;
 617         u64 efi_desc_size;
 618
 619         efi_map_start = __va(ia64_boot_param->efi_memmap);
 620         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 621         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 622
 623         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 624                 md = p;
 625                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 626                         if (md->attribute & EFI_MEMORY_UC)
 627                                 return md->phys_addr;
 628                 }
 629         }
 630         return 0;
 631 }
 632
 633 static struct kern_memdesc *
 634 kern_memory_descriptor (unsigned long phys_addr)
 635 {
 636         struct kern_memdesc *md;
 637
 638         for (md = kern_memmap; md->start != ~0UL; md++) {
 639                 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
 640                          return md;
 641         }
 642         return NULL;
 643 }
 644
 645 static efi_memory_desc_t *
 646 efi_memory_descriptor (unsigned long phys_addr)
 647 {
 648         void *efi_map_start, *efi_map_end, *p;
 649         efi_memory_desc_t *md;
 650         u64 efi_desc_size;
 651
 652         efi_map_start = __va(ia64_boot_param->efi_memmap);
 653         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 654         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 655
 656         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 657                 md = p;
 658
 659                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 660                          return md;
 661         }
 662         return NULL;
 663 }
 664
 665 static int
 666 efi_memmap_intersects (unsigned long phys_addr, unsigned long size)
 667 {
 668         void *efi_map_start, *efi_map_end, *p;
 669         efi_memory_desc_t *md;
 670         u64 efi_desc_size;
 671         unsigned long end;
 672
 673         efi_map_start = __va(ia64_boot_param->efi_memmap);
 674         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 675         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 676
 677         end = phys_addr + size;
 678
 679         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 680                 md = p;
 681
 682                 if (md->phys_addr < end && efi_md_end(md) > phys_addr)
 683                         return 1;
 684         }
 685         return 0;
 686 }
 687
 688 u32
 689 efi_mem_type (unsigned long phys_addr)
 690 {
 691         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 692
 693         if (md)
 694                 return md->type;
 695         return 0;
 696 }
 697
 698 u64
 699 efi_mem_attributes (unsigned long phys_addr)
 700 {
 701         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 702
 703         if (md)
 704                 return md->attribute;
 705         return 0;
 706 }
 707 EXPORT_SYMBOL(efi_mem_attributes);
 708
 709 u64
 710 efi_mem_attribute (unsigned long phys_addr, unsigned long size)
 711 {
 712         unsigned long end = phys_addr + size;
 713         efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
 714         u64 attr;
 715
 716         if (!md)
 717                 return 0;
 718
 719         /*
 720          * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
 721          * the kernel that firmware needs this region mapped.
 722          */
 723         attr = md->attribute & ~EFI_MEMORY_RUNTIME;
 724         do {
 725                 unsigned long md_end = efi_md_end(md);
 726
 727                 if (end <= md_end)
 728                         return attr;
 729
 730                 md = efi_memory_descriptor(md_end);
 731                 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
 732                         return 0;
 733         } while (md);
 734         return 0;
 735 }
 736
 737 u64
 738 kern_mem_attribute (unsigned long phys_addr, unsigned long size)
 739 {
 740         unsigned long end = phys_addr + size;
 741         struct kern_memdesc *md;
 742         u64 attr;
 743
 744         /*
 745          * This is a hack for ioremap calls before we set up kern_memmap.
 746          * Maybe we should do efi_memmap_init() earlier instead.
 747          */
 748         if (!kern_memmap) {
 749                 attr = efi_mem_attribute(phys_addr, size);
 750                 if (attr & EFI_MEMORY_WB)
 751                         return EFI_MEMORY_WB;
 752                 return 0;
 753         }
 754
 755         md = kern_memory_descriptor(phys_addr);
 756         if (!md)
 757                 return 0;
 758
 759         attr = md->attribute;
 760         do {
 761                 unsigned long md_end = kmd_end(md);
 762
 763                 if (end <= md_end)
 764                         return attr;
 765
 766                 md = kern_memory_descriptor(md_end);
 767                 if (!md || md->attribute != attr)
 768                         return 0;
 769         } while (md);
 770         return 0;
 771 }
 772 EXPORT_SYMBOL(kern_mem_attribute);
 773
 774 int
 775 valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 776 {
 777         u64 attr;
 778
 779         /*
 780          * /dev/mem reads and writes use copy_to_user(), which implicitly
 781          * uses a granule-sized kernel identity mapping.  It's really
 782          * only safe to do this for regions in kern_memmap.  For more
 783          * details, see Documentation/ia64/aliasing.txt.
 784          */
 785         attr = kern_mem_attribute(phys_addr, size);
 786         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 787                 return 1;
 788         return 0;
 789 }
 790
 791 int
 792 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 793 {
 794         unsigned long phys_addr = pfn << PAGE_SHIFT;
 795         u64 attr;
 796
 797         attr = efi_mem_attribute(phys_addr, size);
 798
 799         /*
 800          * /dev/mem mmap uses normal user pages, so we don't need the entire
 801          * granule, but the entire region we're mapping must support the same
 802          * attribute.
 803          */
 804         if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
 805                 return 1;
 806
 807         /*
 808          * Intel firmware doesn't tell us about all the MMIO regions, so
 809          * in general we have to allow mmap requests.  But if EFI *does*
 810          * tell us about anything inside this region, we should deny it.
 811          * The user can always map a smaller region to avoid the overlap.
 812          */
 813         if (efi_memmap_intersects(phys_addr, size))
 814                 return 0;
 815
 816         return 1;
 817 }
 818
 819 pgprot_t
 820 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
 821                      pgprot_t vma_prot)
 822 {
 823         unsigned long phys_addr = pfn << PAGE_SHIFT;
 824         u64 attr;
 825
 826         /*
 827          * For /dev/mem mmap, we use user mappings, but if the region is
 828          * in kern_memmap (and hence may be covered by a kernel mapping),
 829          * we must use the same attribute as the kernel mapping.
 830          */
 831         attr = kern_mem_attribute(phys_addr, size);
 832         if (attr & EFI_MEMORY_WB)
 833                 return pgprot_cacheable(vma_prot);
 834         else if (attr & EFI_MEMORY_UC)
 835                 return pgprot_noncached(vma_prot);
 836
 837         /*
 838          * Some chipsets don't support UC access to memory.  If
 839          * WB is supported, we prefer that.
 840          */
 841         if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
 842                 return pgprot_cacheable(vma_prot);
 843
 844         return pgprot_noncached(vma_prot);
 845 }
 846
 847 int __init
 848 efi_uart_console_only(void)
 849 {
 850         efi_status_t status;
 851         char *s, name[] = "ConOut";
 852         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 853         efi_char16_t *utf16, name_utf16[32];
 854         unsigned char data[1024];
 855         unsigned long size = sizeof(data);
 856         struct efi_generic_dev_path *hdr, *end_addr;
 857         int uart = 0;
 858
 859         /* Convert to UTF-16 */
 860         utf16 = name_utf16;
 861         s = name;
 862         while (*s)
 863                 *utf16++ = *s++ & 0x7f;
 864         *utf16 = 0;
 865
 866         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 867         if (status != EFI_SUCCESS) {
 868                 printk(KERN_ERR "No EFI %s variable?\n", name);
 869                 return 0;
 870         }
 871
 872         hdr = (struct efi_generic_dev_path *) data;
 873         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 874         while (hdr < end_addr) {
 875                 if (hdr->type == EFI_DEV_MSG &&
 876                     hdr->sub_type == EFI_DEV_MSG_UART)
 877                         uart = 1;
 878                 else if (hdr->type == EFI_DEV_END_PATH ||
 879                           hdr->type == EFI_DEV_END_PATH2) {
 880                         if (!uart)
 881                                 return 0;
 882                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 883                                 return 1;
 884                         uart = 0;
 885                 }
 886                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 887         }
 888         printk(KERN_ERR "Malformed %s value\n", name);
 889         return 0;
 890 }
 891
 892 /*
 893  * Look for the first granule aligned memory descriptor memory
 894  * that is big enough to hold EFI memory map. Make sure this
 895  * descriptor is atleast granule sized so it does not get trimmed
 896  */
 897 struct kern_memdesc *
 898 find_memmap_space (void)
 899 {
 900         u64     contig_low=0, contig_high=0;
 901         u64     as = 0, ae;
 902         void *efi_map_start, *efi_map_end, *p, *q;
 903         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 904         u64     space_needed, efi_desc_size;
 905         unsigned long total_mem = 0;
 906
 907         efi_map_start = __va(ia64_boot_param->efi_memmap);
 908         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 909         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 910
 911         /*
 912          * Worst case: we need 3 kernel descriptors for each efi descriptor
 913          * (if every entry has a WB part in the middle, and UC head and tail),
 914          * plus one for the end marker.
 915          */
 916         space_needed = sizeof(kern_memdesc_t) *
 917                 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
 918
 919         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 920                 md = p;
 921                 if (!efi_wb(md)) {
 922                         continue;
 923                 }
 924                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
 925                         contig_low = GRANULEROUNDUP(md->phys_addr);
 926                         contig_high = efi_md_end(md);
 927                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
 928                                 check_md = q;
 929                                 if (!efi_wb(check_md))
 930                                         break;
 931                                 if (contig_high != check_md->phys_addr)
 932                                         break;
 933                                 contig_high = efi_md_end(check_md);
 934                         }
 935                         contig_high = GRANULEROUNDDOWN(contig_high);
 936                 }
 937                 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA)
 938                         continue;
 939
 940                 /* Round ends inward to granule boundaries */
 941                 as = max(contig_low, md->phys_addr);
 942                 ae = min(contig_high, efi_md_end(md));
 943
 944                 /* keep within max_addr= and min_addr= command line arg */
 945                 as = max(as, min_addr);
 946                 ae = min(ae, max_addr);
 947                 if (ae <= as)
 948                         continue;
 949
 950                 /* avoid going over mem= command line arg */
 951                 if (total_mem + (ae - as) > mem_limit)
 952                         ae -= total_mem + (ae - as) - mem_limit;
 953
 954                 if (ae <= as)
 955                         continue;
 956
 957                 if (ae - as > space_needed)
 958                         break;
 959         }
 960         if (p >= efi_map_end)
 961                 panic("Can't allocate space for kernel memory descriptors");
 962
 963         return __va(as);
 964 }
 965
 966 /*
 967  * Walk the EFI memory map and gather all memory available for kernel
 968  * to use.  We can allocate partial granules only if the unavailable
 969  * parts exist, and are WB.
 970  */
 971 unsigned long
 972 efi_memmap_init(unsigned long *s, unsigned long *e)
 973 {
 974         struct kern_memdesc *k, *prev = NULL;
 975         u64     contig_low=0, contig_high=0;
 976         u64     as, ae, lim;
 977         void *efi_map_start, *efi_map_end, *p, *q;
 978         efi_memory_desc_t *md, *pmd = NULL, *check_md;
 979         u64     efi_desc_size;
 980         unsigned long total_mem = 0;
 981
 982         k = kern_memmap = find_memmap_space();
 983
 984         efi_map_start = __va(ia64_boot_param->efi_memmap);
 985         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 986         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 987
 988         for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
 989                 md = p;
 990                 if (!efi_wb(md)) {
 991                         if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
 992                                            md->type == EFI_BOOT_SERVICES_DATA)) {
 993                                 k->attribute = EFI_MEMORY_UC;
 994                                 k->start = md->phys_addr;
 995                                 k->num_pages = md->num_pages;
 996                                 k++;
 997                         }
 998                         continue;
 999                 }
1000                 if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
1001                         contig_low = GRANULEROUNDUP(md->phys_addr);
1002                         contig_high = efi_md_end(md);
1003                         for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
1004                                 check_md = q;
1005                                 if (!efi_wb(check_md))
1006                                         break;
1007                                 if (contig_high != check_md->phys_addr)
1008                                         break;
1009                                 contig_high = efi_md_end(check_md);
1010                         }
1011                         contig_high = GRANULEROUNDDOWN(contig_high);
1012                 }
1013                 if (!is_memory_available(md))
1014                         continue;
1015
1016 #ifdef CONFIG_CRASH_DUMP
1017                 /* saved_max_pfn should ignore max_addr= command line arg */
1018                 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT))
1019                         saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT);
1020 #endif
1021                 /*
1022                  * Round ends inward to granule boundaries
1023                  * Give trimmings to uncached allocator
1024                  */
1025                 if (md->phys_addr < contig_low) {
1026                         lim = min(efi_md_end(md), contig_low);
1027                         if (efi_uc(md)) {
1028                                 if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
1029                                     kmd_end(k-1) == md->phys_addr) {
1030                                         (k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
1031                                 } else {
1032                                         k->attribute = EFI_MEMORY_UC;
1033                                         k->start = md->phys_addr;
1034                                         k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
1035                                         k++;
1036                                 }
1037                         }
1038                         as = contig_low;
1039                 } else
1040                         as = md->phys_addr;
1041
1042                 if (efi_md_end(md) > contig_high) {
1043                         lim = max(md->phys_addr, contig_high);
1044                         if (efi_uc(md)) {
1045                                 if (lim == md->phys_addr && k > kern_memmap &&
1046                                     (k-1)->attribute == EFI_MEMORY_UC &&
1047                                     kmd_end(k-1) == md->phys_addr) {
1048                                         (k-1)->num_pages += md->num_pages;
1049                                 } else {
1050                                         k->attribute = EFI_MEMORY_UC;
1051                                         k->start = lim;
1052                                         k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
1053                                         k++;
1054                                 }
1055                         }
1056                         ae = contig_high;
1057                 } else
1058                         ae = efi_md_end(md);
1059
1060                 /* keep within max_addr= and min_addr= command line arg */
1061                 as = max(as, min_addr);
1062                 ae = min(ae, max_addr);
1063                 if (ae <= as)
1064                         continue;
1065
1066                 /* avoid going over mem= command line arg */
1067                 if (total_mem + (ae - as) > mem_limit)
1068                         ae -= total_mem + (ae - as) - mem_limit;
1069
1070                 if (ae <= as)
1071                         continue;
1072                 if (prev && kmd_end(prev) == md->phys_addr) {
1073                         prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
1074                         total_mem += ae - as;
1075                         continue;
1076                 }
1077                 k->attribute = EFI_MEMORY_WB;
1078                 k->start = as;
1079                 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
1080                 total_mem += ae - as;
1081                 prev = k++;
1082         }
1083         k->start = ~0L; /* end-marker */
1084
1085         /* reserve the memory we are using for kern_memmap */
1086         *s = (u64)kern_memmap;
1087         *e = (u64)++k;
1088
1089         return total_mem;
1090 }
1091
1092 void
1093 efi_initialize_iomem_resources(struct resource *code_resource,
1094                                struct resource *data_resource,
1095                                struct resource *bss_resource)
1096 {
1097         struct resource *res;
1098         void *efi_map_start, *efi_map_end, *p;
1099         efi_memory_desc_t *md;
1100         u64 efi_desc_size;
1101         char *name;
1102         unsigned long flags;
1103
1104         efi_map_start = __va(ia64_boot_param->efi_memmap);
1105         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1106         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1107
1108         res = NULL;
1109
1110         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1111                 md = p;
1112
1113                 if (md->num_pages == 0) /* should not happen */
1114                         continue;
1115
1116                 flags = IORESOURCE_MEM;
1117                 switch (md->type) {
1118
1119                         case EFI_MEMORY_MAPPED_IO:
1120                         case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1121                                 continue;
1122
1123                         case EFI_LOADER_CODE:
1124                         case EFI_LOADER_DATA:
1125                         case EFI_BOOT_SERVICES_DATA:
1126                         case EFI_BOOT_SERVICES_CODE:
1127                         case EFI_CONVENTIONAL_MEMORY:
1128                                 if (md->attribute & EFI_MEMORY_WP) {
1129                                         name = "System ROM";
1130                                         flags |= IORESOURCE_READONLY;
1131                                 } else {
1132                                         name = "System RAM";
1133                                 }
1134                                 break;
1135
1136                         case EFI_ACPI_MEMORY_NVS:
1137                                 name = "ACPI Non-volatile Storage";
1138                                 flags |= IORESOURCE_BUSY;
1139                                 break;
1140
1141                         case EFI_UNUSABLE_MEMORY:
1142                                 name = "reserved";
1143                                 flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
1144                                 break;
1145
1146                         case EFI_RESERVED_TYPE:
1147                         case EFI_RUNTIME_SERVICES_CODE:
1148                         case EFI_RUNTIME_SERVICES_DATA:
1149                         case EFI_ACPI_RECLAIM_MEMORY:
1150                         default:
1151                                 name = "reserved";
1152                                 flags |= IORESOURCE_BUSY;
1153                                 break;
1154                 }
1155
1156                 if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
1157                         printk(KERN_ERR "failed to alocate resource for iomem\n");
1158                         return;
1159                 }
1160
1161                 res->name = name;
1162                 res->start = md->phys_addr;
1163                 res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
1164                 res->flags = flags;
1165
1166                 if (insert_resource(&iomem_resource, res) < 0)
1167                         kfree(res);
1168                 else {
1169                         /*
1170                          * We don't know which region contains
1171                          * kernel data so we try it repeatedly and
1172                          * let the resource manager test it.
1173                          */
1174                         insert_resource(res, code_resource);
1175                         insert_resource(res, data_resource);
1176                         insert_resource(res, bss_resource);
1177 #ifdef CONFIG_KEXEC
1178                         insert_resource(res, &efi_memmap_res);
1179                         insert_resource(res, &boot_param_res);
1180                         if (crashk_res.end > crashk_res.start)
1181                                 insert_resource(res, &crashk_res);
1182 #endif
1183                 }
1184         }
1185 }
1186
1187 #ifdef CONFIG_KEXEC
1188 /* find a block of memory aligned to 64M exclude reserved regions
1189    rsvd_regions are sorted
1190  */
1191 unsigned long __init
1192 kdump_find_rsvd_region (unsigned long size,
1193                 struct rsvd_region *r, int n)
1194 {
1195   int i;
1196   u64 start, end;
1197   u64 alignment = 1UL << _PAGE_SIZE_64M;
1198   void *efi_map_start, *efi_map_end, *p;
1199   efi_memory_desc_t *md;
1200   u64 efi_desc_size;
1201
1202   efi_map_start = __va(ia64_boot_param->efi_memmap);
1203   efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1204   efi_desc_size = ia64_boot_param->efi_memdesc_size;
1205
1206   for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1207           md = p;
1208           if (!efi_wb(md))
1209                   continue;
1210           start = ALIGN(md->phys_addr, alignment);
1211           end = efi_md_end(md);
1212           for (i = 0; i < n; i++) {
1213                 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) {
1214                         if (__pa(r[i].start) > start + size)
1215                                 return start;
1216                         start = ALIGN(__pa(r[i].end), alignment);
1217                         if (i < n-1 && __pa(r[i+1].start) < start + size)
1218                                 continue;
1219                         else
1220                                 break;
1221                 }
1222           }
1223           if (end > start + size)
1224                 return start;
1225   }
1226
1227   printk(KERN_WARNING "Cannot reserve 0x%lx byte of memory for crashdump\n",
1228         size);
1229   return ~0UL;
1230 }
1231 #endif
1232
1233 #ifdef CONFIG_PROC_VMCORE
1234 /* locate the size find a the descriptor at a certain address */
1235 unsigned long __init
1236 vmcore_find_descriptor_size (unsigned long address)
1237 {
1238         void *efi_map_start, *efi_map_end, *p;
1239         efi_memory_desc_t *md;
1240         u64 efi_desc_size;
1241         unsigned long ret = 0;
1242
1243         efi_map_start = __va(ia64_boot_param->efi_memmap);
1244         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
1245         efi_desc_size = ia64_boot_param->efi_memdesc_size;
1246
1247         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
1248                 md = p;
1249                 if (efi_wb(md) && md->type == EFI_LOADER_DATA
1250                     && md->phys_addr == address) {
1251                         ret = efi_md_size(md);
1252                         break;
1253                 }
1254         }
1255
1256         if (ret == 0)
1257                 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n");
1258
1259         return ret;
1260 }
1261 #endif