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  *
  12  * All EFI Runtime Services are not implemented yet as EFI only
  13  * supports physical mode addressing on SoftSDV. This is to be fixed
  14  * in a future version.  --drummond 1999-07-20
  15  *
  16  * Implemented EFI runtime services and virtual mode calls.  --davidm
  17  *
  18  * Goutham Rao: <goutham.rao@intel.com>
  19  *      Skip non-WB memory and ignore empty memory ranges.
  20  */
  21 #include <linux/config.h>
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/types.h>
  25 #include <linux/time.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/efi.h>
  28
  29 #include <asm/io.h>
  30 #include <asm/kregs.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/processor.h>
  33 #include <asm/mca.h>
  34
  35 #define EFI_DEBUG       0
  36
  37 extern efi_status_t efi_call_phys (void *, ...);
  38
  39 struct efi efi;
  40 static efi_runtime_services_t *runtime;
  41
  42 /*
  43  * efi_dir is allocated here, but the directory isn't created
  44  * here, as proc_mkdir() doesn't work this early in the bootup
  45  * process.  Therefore, each module, like efivars, must test for
  46  *    if (!efi_dir)  efi_dir = proc_mkdir("efi", NULL);
  47  * prior to creating their own entries under /proc/efi.
  48  */
  49 #ifdef CONFIG_PROC_FS
  50 struct proc_dir_entry *efi_dir;
  51 #endif
  52
  53 static unsigned long mem_limit = ~0UL;
  54
  55 #define efi_call_virt(f, args...)       (*(f))(args)
  56
  57 #define STUB_GET_TIME(prefix, adjust_arg)                                                       \
  58 static efi_status_t                                                                             \
  59 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                          \
  60 {                                                                                               \
  61         struct ia64_fpreg fr[6];                                                                \
  62         efi_status_t ret;                                                                       \
  63                                                                                                 \
  64         ia64_save_scratch_fpregs(fr);                                                           \
  65         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm),     \
  66                                 adjust_arg(tc));                                                \
  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), adjust_arg(tm));    \
  80         ia64_load_scratch_fpregs(fr);                                                           \
  81         return ret;                                                                             \
  82 }
  83
  84 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  85 static efi_status_t                                                                             \
  86 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  87 {                                                                                               \
  88         struct ia64_fpreg fr[6];                                                                \
  89         efi_status_t ret;                                                                       \
  90                                                                                                 \
  91         ia64_save_scratch_fpregs(fr);                                                           \
  92         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  93                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  94         ia64_load_scratch_fpregs(fr);                                                           \
  95         return ret;                                                                             \
  96 }
  97
  98 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  99 static efi_status_t                                                                             \
 100 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
 101 {                                                                                               \
 102         struct ia64_fpreg fr[6];                                                                \
 103         efi_status_t ret;                                                                       \
 104                                                                                                 \
 105         ia64_save_scratch_fpregs(fr);                                                           \
 106         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 107                                 enabled, adjust_arg(tm));                                       \
 108         ia64_load_scratch_fpregs(fr);                                                           \
 109         return ret;                                                                             \
 110 }
 111
 112 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 113 static efi_status_t                                                                     \
 114 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 115                        unsigned long *data_size, void *data)                            \
 116 {                                                                                       \
 117         struct ia64_fpreg fr[6];                                                        \
 118         efi_status_t ret;                                                               \
 119                                                                                         \
 120         ia64_save_scratch_fpregs(fr);                                                   \
 121         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 122                                 adjust_arg(name), adjust_arg(vendor), adjust_arg(attr), \
 123                                 adjust_arg(data_size), adjust_arg(data));               \
 124         ia64_load_scratch_fpregs(fr);                                                   \
 125         return ret;                                                                     \
 126 }
 127
 128 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 129 static efi_status_t                                                                             \
 130 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 131 {                                                                                               \
 132         struct ia64_fpreg fr[6];                                                                \
 133         efi_status_t ret;                                                                       \
 134                                                                                                 \
 135         ia64_save_scratch_fpregs(fr);                                                           \
 136         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 137                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 138         ia64_load_scratch_fpregs(fr);                                                           \
 139         return ret;                                                                             \
 140 }
 141
 142 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 143 static efi_status_t                                                                     \
 144 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, u32 attr,                \
 145                        unsigned long data_size, void *data)                             \
 146 {                                                                                       \
 147         struct ia64_fpreg fr[6];                                                        \
 148         efi_status_t ret;                                                               \
 149                                                                                         \
 150         ia64_save_scratch_fpregs(fr);                                                   \
 151         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 152                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 153                                 adjust_arg(data));                                      \
 154         ia64_load_scratch_fpregs(fr);                                                   \
 155         return ret;                                                                     \
 156 }
 157
 158 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 159 static efi_status_t                                                                             \
 160 prefix##_get_next_high_mono_count (u64 *count)                                                  \
 161 {                                                                                               \
 162         struct ia64_fpreg fr[6];                                                                \
 163         efi_status_t ret;                                                                       \
 164                                                                                                 \
 165         ia64_save_scratch_fpregs(fr);                                                           \
 166         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 167                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 168         ia64_load_scratch_fpregs(fr);                                                           \
 169         return ret;                                                                             \
 170 }
 171
 172 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 173 static void                                                                     \
 174 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 175                        unsigned long data_size, efi_char16_t *data)             \
 176 {                                                                               \
 177         struct ia64_fpreg fr[6];                                                \
 178                                                                                 \
 179         ia64_save_scratch_fpregs(fr);                                           \
 180         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 181                           reset_type, status, data_size, adjust_arg(data));     \
 182         /* should not return, but just in case... */                            \
 183         ia64_load_scratch_fpregs(fr);                                           \
 184 }
 185
 186 STUB_GET_TIME(phys, __pa)
 187 STUB_SET_TIME(phys, __pa)
 188 STUB_GET_WAKEUP_TIME(phys, __pa)
 189 STUB_SET_WAKEUP_TIME(phys, __pa)
 190 STUB_GET_VARIABLE(phys, __pa)
 191 STUB_GET_NEXT_VARIABLE(phys, __pa)
 192 STUB_SET_VARIABLE(phys, __pa)
 193 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, __pa)
 194 STUB_RESET_SYSTEM(phys, __pa)
 195
 196 STUB_GET_TIME(virt, )
 197 STUB_SET_TIME(virt, )
 198 STUB_GET_WAKEUP_TIME(virt, )
 199 STUB_SET_WAKEUP_TIME(virt, )
 200 STUB_GET_VARIABLE(virt, )
 201 STUB_GET_NEXT_VARIABLE(virt, )
 202 STUB_SET_VARIABLE(virt, )
 203 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, )
 204 STUB_RESET_SYSTEM(virt, )
 205
 206 void
 207 efi_gettimeofday (struct timeval *tv)
 208 {
 209         efi_time_t tm;
 210
 211         memset(tv, 0, sizeof(tv));
 212         if ((*efi.get_time)(&tm, 0) != EFI_SUCCESS)
 213                 return;
 214
 215         tv->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 216         tv->tv_usec = tm.nanosecond / 1000;
 217 }
 218
 219 static int
 220 is_available_memory (efi_memory_desc_t *md)
 221 {
 222         if (!(md->attribute & EFI_MEMORY_WB))
 223                 return 0;
 224
 225         switch (md->type) {
 226               case EFI_LOADER_CODE:
 227               case EFI_LOADER_DATA:
 228               case EFI_BOOT_SERVICES_CODE:
 229               case EFI_BOOT_SERVICES_DATA:
 230               case EFI_CONVENTIONAL_MEMORY:
 231                 return 1;
 232         }
 233         return 0;
 234 }
 235
 236 /*
 237  * Trim descriptor MD so its starts at address START_ADDR.  If the descriptor covers
 238  * memory that is normally available to the kernel, issue a warning that some memory
 239  * is being ignored.
 240  */
 241 static void
 242 trim_bottom (efi_memory_desc_t *md, u64 start_addr)
 243 {
 244         u64 num_skipped_pages;
 245
 246         if (md->phys_addr >= start_addr || !md->num_pages)
 247                 return;
 248
 249         num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
 250         if (num_skipped_pages > md->num_pages)
 251                 num_skipped_pages = md->num_pages;
 252
 253         if (is_available_memory(md))
 254                 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
 255                        "at 0x%lx\n", __FUNCTION__,
 256                        (num_skipped_pages << EFI_PAGE_SHIFT) >> 10,
 257                        md->phys_addr, start_addr - IA64_GRANULE_SIZE);
 258         /*
 259          * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory
 260          * descriptor list to become unsorted.  In such a case, md->num_pages will be
 261          * zero, so the Right Thing will happen.
 262          */
 263         md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT;
 264         md->num_pages -= num_skipped_pages;
 265 }
 266
 267 static void
 268 trim_top (efi_memory_desc_t *md, u64 end_addr)
 269 {
 270         u64 num_dropped_pages, md_end_addr;
 271
 272         md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
 273
 274         if (md_end_addr <= end_addr || !md->num_pages)
 275                 return;
 276
 277         num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT;
 278         if (num_dropped_pages > md->num_pages)
 279                 num_dropped_pages = md->num_pages;
 280
 281         if (is_available_memory(md))
 282                 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
 283                        "at 0x%lx\n", __FUNCTION__,
 284                        (num_dropped_pages << EFI_PAGE_SHIFT) >> 10,
 285                        md->phys_addr, end_addr);
 286         md->num_pages -= num_dropped_pages;
 287 }
 288
 289 /*
 290  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 291  * has memory that is available for OS use.
 292  */
 293 void
 294 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 295 {
 296         int prev_valid = 0;
 297         struct range {
 298                 u64 start;
 299                 u64 end;
 300         } prev, curr;
 301         void *efi_map_start, *efi_map_end, *p, *q;
 302         efi_memory_desc_t *md, *check_md;
 303         u64 efi_desc_size, start, end, granule_addr, last_granule_addr, first_non_wb_addr = 0;
 304
 305         efi_map_start = __va(ia64_boot_param->efi_memmap);
 306         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 307         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 308
 309         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 310                 md = p;
 311
 312                 /* skip over non-WB memory descriptors; that's all we're interested in... */
 313                 if (!(md->attribute & EFI_MEMORY_WB))
 314                         continue;
 315
 316                 /*
 317                  * granule_addr is the base of md's first granule.
 318                  * [granule_addr - first_non_wb_addr) is guaranteed to
 319                  * be contiguous WB memory.
 320                  */
 321                 granule_addr = md->phys_addr & ~(IA64_GRANULE_SIZE - 1);
 322                 first_non_wb_addr = max(first_non_wb_addr, granule_addr);
 323
 324                 if (first_non_wb_addr < md->phys_addr) {
 325                         trim_bottom(md, granule_addr + IA64_GRANULE_SIZE);
 326                         granule_addr = md->phys_addr & ~(IA64_GRANULE_SIZE - 1);
 327                         first_non_wb_addr = max(first_non_wb_addr, granule_addr);
 328                 }
 329
 330                 for (q = p; q < efi_map_end; q += efi_desc_size) {
 331                         check_md = q;
 332
 333                         if ((check_md->attribute & EFI_MEMORY_WB) &&
 334                             (check_md->phys_addr == first_non_wb_addr))
 335                                 first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT;
 336                         else
 337                                 break;          /* non-WB or hole */
 338                 }
 339
 340                 last_granule_addr = first_non_wb_addr & ~(IA64_GRANULE_SIZE - 1);
 341                 if (last_granule_addr < md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT))
 342                         trim_top(md, last_granule_addr);
 343
 344                 if (is_available_memory(md)) {
 345                         if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) {
 346                                 if (md->phys_addr > mem_limit)
 347                                         continue;
 348                                 md->num_pages = (mem_limit - md->phys_addr) >> EFI_PAGE_SHIFT;
 349                         }
 350
 351                         if (md->num_pages == 0)
 352                                 continue;
 353
 354                         curr.start = PAGE_OFFSET + md->phys_addr;
 355                         curr.end   = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 356
 357                         if (!prev_valid) {
 358                                 prev = curr;
 359                                 prev_valid = 1;
 360                         } else {
 361                                 if (curr.start < prev.start)
 362                                         printk(KERN_ERR "Oops: EFI memory table not ordered!\n");
 363
 364                                 if (prev.end == curr.start) {
 365                                         /* merge two consecutive memory ranges */
 366                                         prev.end = curr.end;
 367                                 } else {
 368                                         start = PAGE_ALIGN(prev.start);
 369                                         end = prev.end & PAGE_MASK;
 370                                         if ((end > start) && (*callback)(start, end, arg) < 0)
 371                                                 return;
 372                                         prev = curr;
 373                                 }
 374                         }
 375                 }
 376         }
 377         if (prev_valid) {
 378                 start = PAGE_ALIGN(prev.start);
 379                 end = prev.end & PAGE_MASK;
 380                 if (end > start)
 381                         (*callback)(start, end, arg);
 382         }
 383 }
 384
 385 /*
 386  * Look for the PAL_CODE region reported by EFI and maps it using an
 387  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 388  * Abstraction Layer chapter 11 in ADAG
 389  */
 390 void
 391 efi_map_pal_code (void)
 392 {
 393         void *efi_map_start, *efi_map_end, *p;
 394         efi_memory_desc_t *md;
 395         u64 efi_desc_size;
 396         int pal_code_count = 0;
 397         u64 mask, psr;
 398         u64 vaddr;
 399 #ifdef CONFIG_IA64_MCA
 400         int cpu;
 401 #endif
 402
 403         efi_map_start = __va(ia64_boot_param->efi_memmap);
 404         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 405         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 406
 407         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 408                 md = p;
 409                 if (md->type != EFI_PAL_CODE)
 410                         continue;
 411
 412                 if (++pal_code_count > 1) {
 413                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 414                                md->phys_addr);
 415                         continue;
 416                 }
 417                 /*
 418                  * The only ITLB entry in region 7 that is used is the one installed by
 419                  * __start().  That entry covers a 64MB range.
 420                  */
 421                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 422                 vaddr = PAGE_OFFSET + md->phys_addr;
 423
 424                 /*
 425                  * We must check that the PAL mapping won't overlap with the kernel
 426                  * mapping.
 427                  *
 428                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 429                  * 256KB and that only one ITR is needed to map it. This implies that the
 430                  * PAL code is always aligned on its size, i.e., the closest matching page
 431                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 432                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 433                  * now the following test is enough to determine whether or not we need a
 434                  * dedicated ITR for the PAL code.
 435                  */
 436                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 437                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 438                                __FUNCTION__);
 439                         continue;
 440                 }
 441
 442                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 443                         panic("Woah!  PAL code size bigger than a granule!");
 444
 445                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 446 #if EFI_DEBUG
 447                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 448                        smp_processor_id(), md->phys_addr,
 449                        md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 450                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 451 #endif
 452
 453                 /*
 454                  * Cannot write to CRx with PSR.ic=1
 455                  */
 456                 psr = ia64_clear_ic();
 457                 ia64_itr(0x1, IA64_TR_PALCODE, vaddr & mask,
 458                          pte_val(mk_pte_phys(md->phys_addr, PAGE_KERNEL)), IA64_GRANULE_SHIFT);
 459                 ia64_set_psr(psr);              /* restore psr */
 460                 ia64_srlz_i();
 461
 462 #ifdef CONFIG_IA64_MCA
 463                 cpu = smp_processor_id();
 464
 465                 /* insert this TR into our list for MCA recovery purposes */
 466                 ia64_mca_tlb_list[cpu].pal_base=vaddr & mask;
 467                 ia64_mca_tlb_list[cpu].pal_paddr= pte_val(mk_pte_phys(md->phys_addr, PAGE_KERNEL));
 468 #endif
 469         }
 470 }
 471
 472 void __init
 473 efi_init (void)
 474 {
 475         void *efi_map_start, *efi_map_end;
 476         efi_config_table_t *config_tables;
 477         efi_char16_t *c16;
 478         u64 efi_desc_size;
 479         char *cp, *end, vendor[100] = "unknown";
 480         extern char saved_command_line[];
 481         int i;
 482
 483         /* it's too early to be able to use the standard kernel command line support... */
 484         for (cp = saved_command_line; *cp; ) {
 485                 if (memcmp(cp, "mem=", 4) == 0) {
 486                         cp += 4;
 487                         mem_limit = memparse(cp, &end) - 1;
 488                         if (end != cp)
 489                                 break;
 490                         cp = end;
 491                 } else {
 492                         while (*cp != ' ' && *cp)
 493                                 ++cp;
 494                         while (*cp == ' ')
 495                                 ++cp;
 496                 }
 497         }
 498         if (mem_limit != ~0UL)
 499                 printk(KERN_INFO "Ignoring memory above %luMB\n", mem_limit >> 20);
 500
 501         efi.systab = __va(ia64_boot_param->efi_systab);
 502
 503         /*
 504          * Verify the EFI Table
 505          */
 506         if (efi.systab == NULL)
 507                 panic("Woah! Can't find EFI system table.\n");
 508         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 509                 panic("Woah! EFI system table signature incorrect\n");
 510         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 511                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 512                        "got %d.%02d, expected %d.%02d\n",
 513                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 514                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 515
 516         config_tables = __va(efi.systab->tables);
 517
 518         /* Show what we know for posterity */
 519         c16 = __va(efi.systab->fw_vendor);
 520         if (c16) {
 521                 for (i = 0;i < sizeof(vendor) && *c16; ++i)
 522                         vendor[i] = *c16++;
 523                 vendor[i] = '\0';
 524         }
 525
 526         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 527                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 528
 529         for (i = 0; i < efi.systab->nr_tables; i++) {
 530                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 531                         efi.mps = __va(config_tables[i].table);
 532                         printk(" MPS=0x%lx", config_tables[i].table);
 533                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 534                         efi.acpi20 = __va(config_tables[i].table);
 535                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 536                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 537                         efi.acpi = __va(config_tables[i].table);
 538                         printk(" ACPI=0x%lx", config_tables[i].table);
 539                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 540                         efi.smbios = __va(config_tables[i].table);
 541                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 542                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 543                         efi.sal_systab = __va(config_tables[i].table);
 544                         printk(" SALsystab=0x%lx", config_tables[i].table);
 545                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 546                         efi.hcdp = __va(config_tables[i].table);
 547                         printk(" HCDP=0x%lx", config_tables[i].table);
 548                 }
 549         }
 550         printk("\n");
 551
 552         runtime = __va(efi.systab->runtime);
 553         efi.get_time = phys_get_time;
 554         efi.set_time = phys_set_time;
 555         efi.get_wakeup_time = phys_get_wakeup_time;
 556         efi.set_wakeup_time = phys_set_wakeup_time;
 557         efi.get_variable = phys_get_variable;
 558         efi.get_next_variable = phys_get_next_variable;
 559         efi.set_variable = phys_set_variable;
 560         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 561         efi.reset_system = phys_reset_system;
 562
 563         efi_map_start = __va(ia64_boot_param->efi_memmap);
 564         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 565         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 566
 567 #if EFI_DEBUG
 568         /* print EFI memory map: */
 569         {
 570                 efi_memory_desc_t *md;
 571                 void *p;
 572
 573                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 574                         md = p;
 575                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 576                                i, md->type, md->attribute, md->phys_addr,
 577                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 578                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 579                 }
 580         }
 581 #endif
 582
 583         efi_map_pal_code();
 584         efi_enter_virtual_mode();
 585 }
 586
 587 void
 588 efi_enter_virtual_mode (void)
 589 {
 590         void *efi_map_start, *efi_map_end, *p;
 591         efi_memory_desc_t *md;
 592         efi_status_t status;
 593         u64 efi_desc_size;
 594
 595         efi_map_start = __va(ia64_boot_param->efi_memmap);
 596         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 597         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 598
 599         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 600                 md = p;
 601                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 602                         /*
 603                          * Some descriptors have multiple bits set, so the order of
 604                          * the tests is relevant.
 605                          */
 606                         if (md->attribute & EFI_MEMORY_WB) {
 607                                 md->virt_addr = (u64) __va(md->phys_addr);
 608                         } else if (md->attribute & EFI_MEMORY_UC) {
 609                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 610                         } else if (md->attribute & EFI_MEMORY_WC) {
 611 #if 0
 612                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 613                                                                            | _PAGE_D
 614                                                                            | _PAGE_MA_WC
 615                                                                            | _PAGE_PL_0
 616                                                                            | _PAGE_AR_RW));
 617 #else
 618                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 619                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 620 #endif
 621                         } else if (md->attribute & EFI_MEMORY_WT) {
 622 #if 0
 623                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 624                                                                            | _PAGE_D | _PAGE_MA_WT
 625                                                                            | _PAGE_PL_0
 626                                                                            | _PAGE_AR_RW));
 627 #else
 628                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 629                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 630 #endif
 631                         }
 632                 }
 633         }
 634
 635         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 636                                ia64_boot_param->efi_memmap_size,
 637                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 638                                ia64_boot_param->efi_memmap);
 639         if (status != EFI_SUCCESS) {
 640                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode (status=0x%lx)\n", status);
 641                 return;
 642         }
 643
 644         /*
 645          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 646          */
 647         efi.get_time = virt_get_time;
 648         efi.set_time = virt_set_time;
 649         efi.get_wakeup_time = virt_get_wakeup_time;
 650         efi.set_wakeup_time = virt_set_wakeup_time;
 651         efi.get_variable = virt_get_variable;
 652         efi.get_next_variable = virt_get_next_variable;
 653         efi.set_variable = virt_set_variable;
 654         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 655         efi.reset_system = virt_reset_system;
 656 }
 657
 658 /*
 659  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 660  * this type, other I/O port ranges should be described via ACPI.
 661  */
 662 u64
 663 efi_get_iobase (void)
 664 {
 665         void *efi_map_start, *efi_map_end, *p;
 666         efi_memory_desc_t *md;
 667         u64 efi_desc_size;
 668
 669         efi_map_start = __va(ia64_boot_param->efi_memmap);
 670         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 671         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 672
 673         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 674                 md = p;
 675                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 676                         if (md->attribute & EFI_MEMORY_UC)
 677                                 return md->phys_addr;
 678                 }
 679         }
 680         return 0;
 681 }
 682
 683 u32
 684 efi_mem_type (unsigned long phys_addr)
 685 {
 686         void *efi_map_start, *efi_map_end, *p;
 687         efi_memory_desc_t *md;
 688         u64 efi_desc_size;
 689
 690         efi_map_start = __va(ia64_boot_param->efi_memmap);
 691         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 692         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 693
 694         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 695                 md = p;
 696
 697                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 698                          return md->type;
 699         }
 700         return 0;
 701 }
 702
 703 u64
 704 efi_mem_attributes (unsigned long phys_addr)
 705 {
 706         void *efi_map_start, *efi_map_end, *p;
 707         efi_memory_desc_t *md;
 708         u64 efi_desc_size;
 709
 710         efi_map_start = __va(ia64_boot_param->efi_memmap);
 711         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 712         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 713
 714         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 715                 md = p;
 716
 717                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 718                         return md->attribute;
 719         }
 720         return 0;
 721 }
 722
 723 static void __exit
 724 efivars_exit (void)
 725 {
 726 #ifdef CONFIG_PROC_FS
 727         remove_proc_entry(efi_dir->name, NULL);
 728 #endif
 729 }