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
  34 #define EFI_DEBUG       0
  35
  36 extern efi_status_t efi_call_phys (void *, ...);
  37
  38 struct efi efi;
  39 static efi_runtime_services_t *runtime;
  40
  41 /*
  42  * efi_dir is allocated here, but the directory isn't created
  43  * here, as proc_mkdir() doesn't work this early in the bootup
  44  * process.  Therefore, each module, like efivars, must test for
  45  *    if (!efi_dir)  efi_dir = proc_mkdir("efi", NULL);
  46  * prior to creating their own entries under /proc/efi.
  47  */
  48 #ifdef CONFIG_PROC_FS
  49 struct proc_dir_entry *efi_dir = NULL;
  50 #endif
  51
  52 static unsigned long mem_limit = ~0UL;
  53
  54 #define efi_call_virt(f, args...)       (*(f))(args)
  55
  56 #define STUB_GET_TIME(prefix, adjust_arg)                                                       \
  57 static efi_status_t                                                                             \
  58 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                          \
  59 {                                                                                               \
  60         struct ia64_fpreg fr[6];                                                                \
  61         efi_status_t ret;                                                                       \
  62                                                                                                 \
  63         ia64_save_scratch_fpregs(fr);                                                           \
  64         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm),     \
  65                                 adjust_arg(tc));                                                \
  66         ia64_load_scratch_fpregs(fr);                                                           \
  67         return ret;                                                                             \
  68 }
  69
  70 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  71 static efi_status_t                                                                             \
  72 prefix##_set_time (efi_time_t *tm)                                                              \
  73 {                                                                                               \
  74         struct ia64_fpreg fr[6];                                                                \
  75         efi_status_t ret;                                                                       \
  76                                                                                                 \
  77         ia64_save_scratch_fpregs(fr);                                                           \
  78         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  79         ia64_load_scratch_fpregs(fr);                                                           \
  80         return ret;                                                                             \
  81 }
  82
  83 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  84 static efi_status_t                                                                             \
  85 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  86 {                                                                                               \
  87         struct ia64_fpreg fr[6];                                                                \
  88         efi_status_t ret;                                                                       \
  89                                                                                                 \
  90         ia64_save_scratch_fpregs(fr);                                                           \
  91         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  92                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  93         ia64_load_scratch_fpregs(fr);                                                           \
  94         return ret;                                                                             \
  95 }
  96
  97 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  98 static efi_status_t                                                                             \
  99 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
 100 {                                                                                               \
 101         struct ia64_fpreg fr[6];                                                                \
 102         efi_status_t ret;                                                                       \
 103                                                                                                 \
 104         ia64_save_scratch_fpregs(fr);                                                           \
 105         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 106                                 enabled, adjust_arg(tm));                                       \
 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         efi_status_t ret;                                                               \
 118                                                                                         \
 119         ia64_save_scratch_fpregs(fr);                                                   \
 120         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 121                                 adjust_arg(name), adjust_arg(vendor), adjust_arg(attr), \
 122                                 adjust_arg(data_size), adjust_arg(data));               \
 123         ia64_load_scratch_fpregs(fr);                                                   \
 124         return ret;                                                                     \
 125 }
 126
 127 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 128 static efi_status_t                                                                             \
 129 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 130 {                                                                                               \
 131         struct ia64_fpreg fr[6];                                                                \
 132         efi_status_t ret;                                                                       \
 133                                                                                                 \
 134         ia64_save_scratch_fpregs(fr);                                                           \
 135         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 136                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 137         ia64_load_scratch_fpregs(fr);                                                           \
 138         return ret;                                                                             \
 139 }
 140
 141 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 142 static efi_status_t                                                                     \
 143 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, u32 attr,                \
 144                        unsigned long data_size, void *data)                             \
 145 {                                                                                       \
 146         struct ia64_fpreg fr[6];                                                        \
 147         efi_status_t ret;                                                               \
 148                                                                                         \
 149         ia64_save_scratch_fpregs(fr);                                                   \
 150         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 151                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 152                                 adjust_arg(data));                                      \
 153         ia64_load_scratch_fpregs(fr);                                                   \
 154         return ret;                                                                     \
 155 }
 156
 157 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 158 static efi_status_t                                                                             \
 159 prefix##_get_next_high_mono_count (u64 *count)                                                  \
 160 {                                                                                               \
 161         struct ia64_fpreg fr[6];                                                                \
 162         efi_status_t ret;                                                                       \
 163                                                                                                 \
 164         ia64_save_scratch_fpregs(fr);                                                           \
 165         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 166                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 167         ia64_load_scratch_fpregs(fr);                                                           \
 168         return ret;                                                                             \
 169 }
 170
 171 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 172 static void                                                                     \
 173 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 174                        unsigned long data_size, efi_char16_t *data)             \
 175 {                                                                               \
 176         struct ia64_fpreg fr[6];                                                \
 177                                                                                 \
 178         ia64_save_scratch_fpregs(fr);                                           \
 179         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 180                           reset_type, status, data_size, adjust_arg(data));     \
 181         /* should not return, but just in case... */                            \
 182         ia64_load_scratch_fpregs(fr);                                           \
 183 }
 184
 185 STUB_GET_TIME(phys, __pa)
 186 STUB_SET_TIME(phys, __pa)
 187 STUB_GET_WAKEUP_TIME(phys, __pa)
 188 STUB_SET_WAKEUP_TIME(phys, __pa)
 189 STUB_GET_VARIABLE(phys, __pa)
 190 STUB_GET_NEXT_VARIABLE(phys, __pa)
 191 STUB_SET_VARIABLE(phys, __pa)
 192 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, __pa)
 193 STUB_RESET_SYSTEM(phys, __pa)
 194
 195 STUB_GET_TIME(virt, )
 196 STUB_SET_TIME(virt, )
 197 STUB_GET_WAKEUP_TIME(virt, )
 198 STUB_SET_WAKEUP_TIME(virt, )
 199 STUB_GET_VARIABLE(virt, )
 200 STUB_GET_NEXT_VARIABLE(virt, )
 201 STUB_SET_VARIABLE(virt, )
 202 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, )
 203 STUB_RESET_SYSTEM(virt, )
 204
 205 void
 206 efi_gettimeofday (struct timeval *tv)
 207 {
 208         efi_time_t tm;
 209
 210         memset(tv, 0, sizeof(tv));
 211         if ((*efi.get_time)(&tm, 0) != EFI_SUCCESS)
 212                 return;
 213
 214         tv->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 215         tv->tv_usec = tm.nanosecond / 1000;
 216 }
 217
 218 static int
 219 is_available_memory (efi_memory_desc_t *md)
 220 {
 221         if (!(md->attribute & EFI_MEMORY_WB))
 222                 return 0;
 223
 224         switch (md->type) {
 225               case EFI_LOADER_CODE:
 226               case EFI_LOADER_DATA:
 227               case EFI_BOOT_SERVICES_CODE:
 228               case EFI_BOOT_SERVICES_DATA:
 229               case EFI_CONVENTIONAL_MEMORY:
 230                 return 1;
 231         }
 232         return 0;
 233 }
 234
 235 /*
 236  * Trim descriptor MD so its starts at address START_ADDR.  If the descriptor covers
 237  * memory that is normally available to the kernel, issue a warning that some memory
 238  * is being ignored.
 239  */
 240 static void
 241 trim_bottom (efi_memory_desc_t *md, u64 start_addr)
 242 {
 243         u64 num_skipped_pages;
 244
 245         if (md->phys_addr >= start_addr || !md->num_pages)
 246                 return;
 247
 248         num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
 249         if (num_skipped_pages > md->num_pages)
 250                 num_skipped_pages = md->num_pages;
 251
 252         if (is_available_memory(md))
 253                 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
 254                        "at 0x%lx\n", __FUNCTION__,
 255                        (num_skipped_pages << EFI_PAGE_SHIFT) >> 10,
 256                        md->phys_addr, start_addr - IA64_GRANULE_SIZE);
 257         /*
 258          * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory
 259          * descriptor list to become unsorted.  In such a case, md->num_pages will be
 260          * zero, so the Right Thing will happen.
 261          */
 262         md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT;
 263         md->num_pages -= num_skipped_pages;
 264 }
 265
 266 static void
 267 trim_top (efi_memory_desc_t *md, u64 end_addr)
 268 {
 269         u64 num_dropped_pages, md_end_addr;
 270
 271         md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
 272
 273         if (md_end_addr <= end_addr || !md->num_pages)
 274                 return;
 275
 276         num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT;
 277         if (num_dropped_pages > md->num_pages)
 278                 num_dropped_pages = md->num_pages;
 279
 280         if (is_available_memory(md))
 281                 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
 282                        "at 0x%lx\n", __FUNCTION__,
 283                        (num_dropped_pages << EFI_PAGE_SHIFT) >> 10,
 284                        md->phys_addr, end_addr);
 285         md->num_pages -= num_dropped_pages;
 286 }
 287
 288 /*
 289  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 290  * has memory that is available for OS use.
 291  */
 292 void
 293 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 294 {
 295         int prev_valid = 0;
 296         struct range {
 297                 u64 start;
 298                 u64 end;
 299         } prev, curr;
 300         void *efi_map_start, *efi_map_end, *p, *q, *r;
 301         efi_memory_desc_t *md, *check_md;
 302         u64 efi_desc_size, start, end, granule_addr, first_non_wb_addr = 0;
 303
 304         efi_map_start = __va(ia64_boot_param->efi_memmap);
 305         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 306         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 307
 308         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 309                 md = p;
 310
 311                 /* skip over non-WB memory descriptors; that's all we're interested in... */
 312                 if (!(md->attribute & EFI_MEMORY_WB))
 313                         continue;
 314
 315                 if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) > first_non_wb_addr) {
 316                         /*
 317                          * Search for the next run of contiguous WB memory.  Start search
 318                          * at first granule boundary covered by md.
 319                          */
 320                         granule_addr = ((md->phys_addr + IA64_GRANULE_SIZE - 1)
 321                                         & -IA64_GRANULE_SIZE);
 322                         first_non_wb_addr = granule_addr;
 323                         for (q = p; q < efi_map_end; q += efi_desc_size) {
 324                                 check_md = q;
 325
 326                                 if (check_md->attribute & EFI_MEMORY_WB)
 327                                         trim_bottom(md, granule_addr);
 328
 329                                 if (check_md->phys_addr < granule_addr)
 330                                         continue;
 331
 332                                 if (!(check_md->attribute & EFI_MEMORY_WB))
 333                                         break;  /* hit a non-WB region; stop search */
 334
 335                                 if (check_md->phys_addr != first_non_wb_addr)
 336                                         break;  /* hit a memory hole; stop search */
 337
 338                                 first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT;
 339                         }
 340                         /* round it down to the previous granule-boundary: */
 341                         first_non_wb_addr &= -IA64_GRANULE_SIZE;
 342
 343                         if (!(first_non_wb_addr > granule_addr))
 344                                 continue;       /* couldn't find enough contiguous memory */
 345
 346                         for (r = p; r < q; r += efi_desc_size)
 347                                 trim_top(r, first_non_wb_addr);
 348                 }
 349
 350                 if (is_available_memory(md)) {
 351                         if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) {
 352                                 if (md->phys_addr > mem_limit)
 353                                         continue;
 354                                 md->num_pages = (mem_limit - md->phys_addr) >> EFI_PAGE_SHIFT;
 355                         }
 356
 357                         if (md->num_pages == 0)
 358                                 continue;
 359
 360                         curr.start = PAGE_OFFSET + md->phys_addr;
 361                         curr.end   = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 362
 363                         if (!prev_valid) {
 364                                 prev = curr;
 365                                 prev_valid = 1;
 366                         } else {
 367                                 if (curr.start < prev.start)
 368                                         printk(KERN_ERR "Oops: EFI memory table not ordered!\n");
 369
 370                                 if (prev.end == curr.start) {
 371                                         /* merge two consecutive memory ranges */
 372                                         prev.end = curr.end;
 373                                 } else {
 374                                         start = PAGE_ALIGN(prev.start);
 375                                         end = prev.end & PAGE_MASK;
 376                                         if ((end > start) && (*callback)(start, end, arg) < 0)
 377                                                 return;
 378                                         prev = curr;
 379                                 }
 380                         }
 381                 }
 382         }
 383         if (prev_valid) {
 384                 start = PAGE_ALIGN(prev.start);
 385                 end = prev.end & PAGE_MASK;
 386                 if (end > start)
 387                         (*callback)(start, end, arg);
 388         }
 389 }
 390
 391 /*
 392  * Look for the PAL_CODE region reported by EFI and maps it using an
 393  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 394  * Abstraction Layer chapter 11 in ADAG
 395  */
 396 void
 397 efi_map_pal_code (void)
 398 {
 399         void *efi_map_start, *efi_map_end, *p;
 400         efi_memory_desc_t *md;
 401         u64 efi_desc_size;
 402         int pal_code_count = 0;
 403         u64 mask, psr;
 404         u64 vaddr;
 405
 406         efi_map_start = __va(ia64_boot_param->efi_memmap);
 407         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 408         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 409
 410         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 411                 md = p;
 412                 if (md->type != EFI_PAL_CODE)
 413                         continue;
 414
 415                 if (++pal_code_count > 1) {
 416                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 417                                md->phys_addr);
 418                         continue;
 419                 }
 420                 /*
 421                  * The only ITLB entry in region 7 that is used is the one installed by
 422                  * __start().  That entry covers a 64MB range.
 423                  */
 424                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 425                 vaddr = PAGE_OFFSET + md->phys_addr;
 426
 427                 /*
 428                  * We must check that the PAL mapping won't overlap with the kernel
 429                  * mapping.
 430                  *
 431                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 432                  * 256KB and that only one ITR is needed to map it. This implies that the
 433                  * PAL code is always aligned on its size, i.e., the closest matching page
 434                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 435                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 436                  * now the following test is enough to determine whether or not we need a
 437                  * dedicated ITR for the PAL code.
 438                  */
 439                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 440                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 441                                __FUNCTION__);
 442                         continue;
 443                 }
 444
 445                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 446                         panic("Woah!  PAL code size bigger than a granule!");
 447
 448                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 449                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 450                        smp_processor_id(), md->phys_addr,
 451                        md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 452                        vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 453
 454                 /*
 455                  * Cannot write to CRx with PSR.ic=1
 456                  */
 457                 psr = ia64_clear_ic();
 458                 ia64_itr(0x1, IA64_TR_PALCODE, vaddr & mask,
 459                          pte_val(pfn_pte(md->phys_addr >> PAGE_SHIFT, PAGE_KERNEL)),
 460                          IA64_GRANULE_SHIFT);
 461                 ia64_set_psr(psr);              /* restore psr */
 462                 ia64_srlz_i();
 463         }
 464 }
 465
 466 void __init
 467 efi_init (void)
 468 {
 469         void *efi_map_start, *efi_map_end;
 470         efi_config_table_t *config_tables;
 471         efi_char16_t *c16;
 472         u64 efi_desc_size;
 473         char *cp, *end, vendor[100] = "unknown";
 474         extern char saved_command_line[];
 475         int i;
 476
 477         /* it's too early to be able to use the standard kernel command line support... */
 478         for (cp = saved_command_line; *cp; ) {
 479                 if (memcmp(cp, "mem=", 4) == 0) {
 480                         cp += 4;
 481                         mem_limit = memparse(cp, &end) - 1;
 482                         if (end != cp)
 483                                 break;
 484                         cp = end;
 485                 } else {
 486                         while (*cp != ' ' && *cp)
 487                                 ++cp;
 488                         while (*cp == ' ')
 489                                 ++cp;
 490                 }
 491         }
 492         if (mem_limit != ~0UL)
 493                 printk(KERN_INFO "Ignoring memory above %luMB\n", mem_limit >> 20);
 494
 495         efi.systab = __va(ia64_boot_param->efi_systab);
 496
 497         /*
 498          * Verify the EFI Table
 499          */
 500         if (efi.systab == NULL)
 501                 panic("Woah! Can't find EFI system table.\n");
 502         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 503                 panic("Woah! EFI system table signature incorrect\n");
 504         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 505                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 506                        "got %d.%02d, expected %d.%02d\n",
 507                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 508                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 509
 510         config_tables = __va(efi.systab->tables);
 511
 512         /* Show what we know for posterity */
 513         c16 = __va(efi.systab->fw_vendor);
 514         if (c16) {
 515                 for (i = 0;i < sizeof(vendor) && *c16; ++i)
 516                         vendor[i] = *c16++;
 517                 vendor[i] = '\0';
 518         }
 519
 520         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 521                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 522
 523         for (i = 0; i < efi.systab->nr_tables; i++) {
 524                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 525                         efi.mps = __va(config_tables[i].table);
 526                         printk(" MPS=0x%lx", config_tables[i].table);
 527                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 528                         efi.acpi20 = __va(config_tables[i].table);
 529                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 530                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 531                         efi.acpi = __va(config_tables[i].table);
 532                         printk(" ACPI=0x%lx", config_tables[i].table);
 533                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 534                         efi.smbios = __va(config_tables[i].table);
 535                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 536                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 537                         efi.sal_systab = __va(config_tables[i].table);
 538                         printk(" SALsystab=0x%lx", config_tables[i].table);
 539                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 540                         efi.hcdp = __va(config_tables[i].table);
 541                         printk(" HCDP=0x%lx", config_tables[i].table);
 542                 }
 543         }
 544         printk("\n");
 545
 546         runtime = __va(efi.systab->runtime);
 547         efi.get_time = phys_get_time;
 548         efi.set_time = phys_set_time;
 549         efi.get_wakeup_time = phys_get_wakeup_time;
 550         efi.set_wakeup_time = phys_set_wakeup_time;
 551         efi.get_variable = phys_get_variable;
 552         efi.get_next_variable = phys_get_next_variable;
 553         efi.set_variable = phys_set_variable;
 554         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 555         efi.reset_system = phys_reset_system;
 556
 557         efi_map_start = __va(ia64_boot_param->efi_memmap);
 558         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 559         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 560
 561 #if EFI_DEBUG
 562         /* print EFI memory map: */
 563         {
 564                 efi_memory_desc_t *md;
 565                 void *p;
 566
 567                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 568                         md = p;
 569                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 570                                i, md->type, md->attribute, md->phys_addr,
 571                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 572                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 573                 }
 574         }
 575 #endif
 576
 577         efi_map_pal_code();
 578         efi_enter_virtual_mode();
 579 }
 580
 581 void
 582 efi_enter_virtual_mode (void)
 583 {
 584         void *efi_map_start, *efi_map_end, *p;
 585         efi_memory_desc_t *md;
 586         efi_status_t status;
 587         u64 efi_desc_size;
 588
 589         efi_map_start = __va(ia64_boot_param->efi_memmap);
 590         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 591         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 592
 593         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 594                 md = p;
 595                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 596                         /*
 597                          * Some descriptors have multiple bits set, so the order of
 598                          * the tests is relevant.
 599                          */
 600                         if (md->attribute & EFI_MEMORY_WB) {
 601                                 md->virt_addr = (u64) __va(md->phys_addr);
 602                         } else if (md->attribute & EFI_MEMORY_UC) {
 603                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 604                         } else if (md->attribute & EFI_MEMORY_WC) {
 605 #if 0
 606                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 607                                                                            | _PAGE_D
 608                                                                            | _PAGE_MA_WC
 609                                                                            | _PAGE_PL_0
 610                                                                            | _PAGE_AR_RW));
 611 #else
 612                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 613                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 614 #endif
 615                         } else if (md->attribute & EFI_MEMORY_WT) {
 616 #if 0
 617                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 618                                                                            | _PAGE_D | _PAGE_MA_WT
 619                                                                            | _PAGE_PL_0
 620                                                                            | _PAGE_AR_RW));
 621 #else
 622                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 623                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 624 #endif
 625                         }
 626                 }
 627         }
 628
 629         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 630                                ia64_boot_param->efi_memmap_size,
 631                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 632                                ia64_boot_param->efi_memmap);
 633         if (status != EFI_SUCCESS) {
 634                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 635                        "(status=%lu)\n", status);
 636                 return;
 637         }
 638
 639         /*
 640          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 641          */
 642         efi.get_time = virt_get_time;
 643         efi.set_time = virt_set_time;
 644         efi.get_wakeup_time = virt_get_wakeup_time;
 645         efi.set_wakeup_time = virt_set_wakeup_time;
 646         efi.get_variable = virt_get_variable;
 647         efi.get_next_variable = virt_get_next_variable;
 648         efi.set_variable = virt_set_variable;
 649         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 650         efi.reset_system = virt_reset_system;
 651 }
 652
 653 /*
 654  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 655  * this type, other I/O port ranges should be described via ACPI.
 656  */
 657 u64
 658 efi_get_iobase (void)
 659 {
 660         void *efi_map_start, *efi_map_end, *p;
 661         efi_memory_desc_t *md;
 662         u64 efi_desc_size;
 663
 664         efi_map_start = __va(ia64_boot_param->efi_memmap);
 665         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 666         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 667
 668         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 669                 md = p;
 670                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 671                         /* paranoia attribute checking */
 672                         if (md->attribute == (EFI_MEMORY_UC | EFI_MEMORY_RUNTIME))
 673                                 return md->phys_addr;
 674                 }
 675         }
 676         return 0;
 677 }
 678
 679 u32
 680 efi_mem_type (unsigned long phys_addr)
 681 {
 682         void *efi_map_start, *efi_map_end, *p;
 683         efi_memory_desc_t *md;
 684         u64 efi_desc_size;
 685
 686         efi_map_start = __va(ia64_boot_param->efi_memmap);
 687         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 688         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 689
 690         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 691                 md = p;
 692
 693                 if ((md->phys_addr <= phys_addr) && (phys_addr <=
 694                     (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1)))
 695                          return md->type;
 696         }
 697         return 0;
 698 }
 699
 700 u64
 701 efi_mem_attributes (unsigned long phys_addr)
 702 {
 703         void *efi_map_start, *efi_map_end, *p;
 704         efi_memory_desc_t *md;
 705         u64 efi_desc_size;
 706
 707         efi_map_start = __va(ia64_boot_param->efi_memmap);
 708         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 709         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 710
 711         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 712                 md = p;
 713
 714                 if ((md->phys_addr <= phys_addr) && (phys_addr <=
 715                     (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1)))
 716                         return md->attribute;
 717         }
 718         return 0;
 719 }
 720
 721 static void __exit
 722 efivars_exit (void)
 723 {
 724 #ifdef CONFIG_PROC_FS
 725         remove_proc_entry(efi_dir->name, NULL);
 726 #endif
 727 }