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/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/types.h>
  26 #include <linux/time.h>
  27 #include <linux/efi.h>
  28
  29 #include <asm/io.h>
  30 #include <asm/kregs.h>
  31 #include <asm/meminit.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/processor.h>
  34 #include <asm/mca.h>
  35
  36 #define EFI_DEBUG       0
  37
  38 extern efi_status_t efi_call_phys (void *, ...);
  39
  40 struct efi efi;
  41 EXPORT_SYMBOL(efi);
  42 static efi_runtime_services_t *runtime;
  43 static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
  44
  45 #define efi_call_virt(f, args...)       (*(f))(args)
  46
  47 #define STUB_GET_TIME(prefix, adjust_arg)                                                         \
  48 static efi_status_t                                                                               \
  49 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc)                                            \
  50 {                                                                                                 \
  51         struct ia64_fpreg fr[6];                                                                  \
  52         efi_time_cap_t *atc = NULL;                                                               \
  53         efi_status_t ret;                                                                         \
  54                                                                                                   \
  55         if (tc)                                                                                   \
  56                 atc = adjust_arg(tc);                                                             \
  57         ia64_save_scratch_fpregs(fr);                                                             \
  58         ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
  59         ia64_load_scratch_fpregs(fr);                                                             \
  60         return ret;                                                                               \
  61 }
  62
  63 #define STUB_SET_TIME(prefix, adjust_arg)                                                       \
  64 static efi_status_t                                                                             \
  65 prefix##_set_time (efi_time_t *tm)                                                              \
  66 {                                                                                               \
  67         struct ia64_fpreg fr[6];                                                                \
  68         efi_status_t ret;                                                                       \
  69                                                                                                 \
  70         ia64_save_scratch_fpregs(fr);                                                           \
  71         ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm));    \
  72         ia64_load_scratch_fpregs(fr);                                                           \
  73         return ret;                                                                             \
  74 }
  75
  76 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  77 static efi_status_t                                                                             \
  78 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm)             \
  79 {                                                                                               \
  80         struct ia64_fpreg fr[6];                                                                \
  81         efi_status_t ret;                                                                       \
  82                                                                                                 \
  83         ia64_save_scratch_fpregs(fr);                                                           \
  84         ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time),       \
  85                                 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm));      \
  86         ia64_load_scratch_fpregs(fr);                                                           \
  87         return ret;                                                                             \
  88 }
  89
  90 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg)                                                \
  91 static efi_status_t                                                                             \
  92 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm)                                   \
  93 {                                                                                               \
  94         struct ia64_fpreg fr[6];                                                                \
  95         efi_time_t *atm = NULL;                                                                 \
  96         efi_status_t ret;                                                                       \
  97                                                                                                 \
  98         if (tm)                                                                                 \
  99                 atm = adjust_arg(tm);                                                           \
 100         ia64_save_scratch_fpregs(fr);                                                           \
 101         ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time),       \
 102                                 enabled, atm);                                                  \
 103         ia64_load_scratch_fpregs(fr);                                                           \
 104         return ret;                                                                             \
 105 }
 106
 107 #define STUB_GET_VARIABLE(prefix, adjust_arg)                                           \
 108 static efi_status_t                                                                     \
 109 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,               \
 110                        unsigned long *data_size, void *data)                            \
 111 {                                                                                       \
 112         struct ia64_fpreg fr[6];                                                        \
 113         u32 *aattr = NULL;                                                                      \
 114         efi_status_t ret;                                                               \
 115                                                                                         \
 116         if (attr)                                                                       \
 117                 aattr = adjust_arg(attr);                                               \
 118         ia64_save_scratch_fpregs(fr);                                                   \
 119         ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable),     \
 120                                 adjust_arg(name), adjust_arg(vendor), aattr,            \
 121                                 adjust_arg(data_size), adjust_arg(data));               \
 122         ia64_load_scratch_fpregs(fr);                                                   \
 123         return ret;                                                                     \
 124 }
 125
 126 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg)                                              \
 127 static efi_status_t                                                                             \
 128 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor)   \
 129 {                                                                                               \
 130         struct ia64_fpreg fr[6];                                                                \
 131         efi_status_t ret;                                                                       \
 132                                                                                                 \
 133         ia64_save_scratch_fpregs(fr);                                                           \
 134         ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable),   \
 135                                 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor));   \
 136         ia64_load_scratch_fpregs(fr);                                                           \
 137         return ret;                                                                             \
 138 }
 139
 140 #define STUB_SET_VARIABLE(prefix, adjust_arg)                                           \
 141 static efi_status_t                                                                     \
 142 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr,      \
 143                        unsigned long data_size, void *data)                             \
 144 {                                                                                       \
 145         struct ia64_fpreg fr[6];                                                        \
 146         efi_status_t ret;                                                               \
 147                                                                                         \
 148         ia64_save_scratch_fpregs(fr);                                                   \
 149         ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable),     \
 150                                 adjust_arg(name), adjust_arg(vendor), attr, data_size,  \
 151                                 adjust_arg(data));                                      \
 152         ia64_load_scratch_fpregs(fr);                                                   \
 153         return ret;                                                                     \
 154 }
 155
 156 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg)                                       \
 157 static efi_status_t                                                                             \
 158 prefix##_get_next_high_mono_count (u32 *count)                                                  \
 159 {                                                                                               \
 160         struct ia64_fpreg fr[6];                                                                \
 161         efi_status_t ret;                                                                       \
 162                                                                                                 \
 163         ia64_save_scratch_fpregs(fr);                                                           \
 164         ret = efi_call_##prefix((efi_get_next_high_mono_count_t *)                              \
 165                                 __va(runtime->get_next_high_mono_count), adjust_arg(count));    \
 166         ia64_load_scratch_fpregs(fr);                                                           \
 167         return ret;                                                                             \
 168 }
 169
 170 #define STUB_RESET_SYSTEM(prefix, adjust_arg)                                   \
 171 static void                                                                     \
 172 prefix##_reset_system (int reset_type, efi_status_t status,                     \
 173                        unsigned long data_size, efi_char16_t *data)             \
 174 {                                                                               \
 175         struct ia64_fpreg fr[6];                                                \
 176         efi_char16_t *adata = NULL;                                             \
 177                                                                                 \
 178         if (data)                                                               \
 179                 adata = adjust_arg(data);                                       \
 180                                                                                 \
 181         ia64_save_scratch_fpregs(fr);                                           \
 182         efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system),   \
 183                           reset_type, status, data_size, adata);                \
 184         /* should not return, but just in case... */                            \
 185         ia64_load_scratch_fpregs(fr);                                           \
 186 }
 187
 188 #define phys_ptr(arg)   ((__typeof__(arg)) ia64_tpa(arg))
 189
 190 STUB_GET_TIME(phys, phys_ptr)
 191 STUB_SET_TIME(phys, phys_ptr)
 192 STUB_GET_WAKEUP_TIME(phys, phys_ptr)
 193 STUB_SET_WAKEUP_TIME(phys, phys_ptr)
 194 STUB_GET_VARIABLE(phys, phys_ptr)
 195 STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
 196 STUB_SET_VARIABLE(phys, phys_ptr)
 197 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
 198 STUB_RESET_SYSTEM(phys, phys_ptr)
 199
 200 #define id(arg) arg
 201
 202 STUB_GET_TIME(virt, id)
 203 STUB_SET_TIME(virt, id)
 204 STUB_GET_WAKEUP_TIME(virt, id)
 205 STUB_SET_WAKEUP_TIME(virt, id)
 206 STUB_GET_VARIABLE(virt, id)
 207 STUB_GET_NEXT_VARIABLE(virt, id)
 208 STUB_SET_VARIABLE(virt, id)
 209 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
 210 STUB_RESET_SYSTEM(virt, id)
 211
 212 void
 213 efi_gettimeofday (struct timespec *ts)
 214 {
 215         efi_time_t tm;
 216
 217         memset(ts, 0, sizeof(ts));
 218         if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
 219                 return;
 220
 221         ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
 222         ts->tv_nsec = tm.nanosecond;
 223 }
 224
 225 static int
 226 is_available_memory (efi_memory_desc_t *md)
 227 {
 228         if (!(md->attribute & EFI_MEMORY_WB))
 229                 return 0;
 230
 231         switch (md->type) {
 232               case EFI_LOADER_CODE:
 233               case EFI_LOADER_DATA:
 234               case EFI_BOOT_SERVICES_CODE:
 235               case EFI_BOOT_SERVICES_DATA:
 236               case EFI_CONVENTIONAL_MEMORY:
 237                 return 1;
 238         }
 239         return 0;
 240 }
 241
 242 /*
 243  * Trim descriptor MD so its starts at address START_ADDR.  If the descriptor covers
 244  * memory that is normally available to the kernel, issue a warning that some memory
 245  * is being ignored.
 246  */
 247 static void
 248 trim_bottom (efi_memory_desc_t *md, u64 start_addr)
 249 {
 250         u64 num_skipped_pages;
 251
 252         if (md->phys_addr >= start_addr || !md->num_pages)
 253                 return;
 254
 255         num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
 256         if (num_skipped_pages > md->num_pages)
 257                 num_skipped_pages = md->num_pages;
 258
 259         if (is_available_memory(md))
 260                 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
 261                        "at 0x%lx\n", __FUNCTION__,
 262                        (num_skipped_pages << EFI_PAGE_SHIFT) >> 10,
 263                        md->phys_addr, start_addr - IA64_GRANULE_SIZE);
 264         /*
 265          * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory
 266          * descriptor list to become unsorted.  In such a case, md->num_pages will be
 267          * zero, so the Right Thing will happen.
 268          */
 269         md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT;
 270         md->num_pages -= num_skipped_pages;
 271 }
 272
 273 static void
 274 trim_top (efi_memory_desc_t *md, u64 end_addr)
 275 {
 276         u64 num_dropped_pages, md_end_addr;
 277
 278         md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
 279
 280         if (md_end_addr <= end_addr || !md->num_pages)
 281                 return;
 282
 283         num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT;
 284         if (num_dropped_pages > md->num_pages)
 285                 num_dropped_pages = md->num_pages;
 286
 287         if (is_available_memory(md))
 288                 printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
 289                        "at 0x%lx\n", __FUNCTION__,
 290                        (num_dropped_pages << EFI_PAGE_SHIFT) >> 10,
 291                        md->phys_addr, end_addr);
 292         md->num_pages -= num_dropped_pages;
 293 }
 294
 295 /*
 296  * Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
 297  * has memory that is available for OS use.
 298  */
 299 void
 300 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 301 {
 302         int prev_valid = 0;
 303         struct range {
 304                 u64 start;
 305                 u64 end;
 306         } prev, curr;
 307         void *efi_map_start, *efi_map_end, *p, *q;
 308         efi_memory_desc_t *md, *check_md;
 309         u64 efi_desc_size, start, end, granule_addr, last_granule_addr, first_non_wb_addr = 0;
 310         unsigned long total_mem = 0;
 311
 312         efi_map_start = __va(ia64_boot_param->efi_memmap);
 313         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 314         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 315
 316         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 317                 md = p;
 318
 319                 /* skip over non-WB memory descriptors; that's all we're interested in... */
 320                 if (!(md->attribute & EFI_MEMORY_WB))
 321                         continue;
 322
 323                 /*
 324                  * granule_addr is the base of md's first granule.
 325                  * [granule_addr - first_non_wb_addr) is guaranteed to
 326                  * be contiguous WB memory.
 327                  */
 328                 granule_addr = GRANULEROUNDDOWN(md->phys_addr);
 329                 first_non_wb_addr = max(first_non_wb_addr, granule_addr);
 330
 331                 if (first_non_wb_addr < md->phys_addr) {
 332                         trim_bottom(md, granule_addr + IA64_GRANULE_SIZE);
 333                         granule_addr = GRANULEROUNDDOWN(md->phys_addr);
 334                         first_non_wb_addr = max(first_non_wb_addr, granule_addr);
 335                 }
 336
 337                 for (q = p; q < efi_map_end; q += efi_desc_size) {
 338                         check_md = q;
 339
 340                         if ((check_md->attribute & EFI_MEMORY_WB) &&
 341                             (check_md->phys_addr == first_non_wb_addr))
 342                                 first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT;
 343                         else
 344                                 break;          /* non-WB or hole */
 345                 }
 346
 347                 last_granule_addr = GRANULEROUNDDOWN(first_non_wb_addr);
 348                 if (last_granule_addr < md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT))
 349                         trim_top(md, last_granule_addr);
 350
 351                 if (is_available_memory(md)) {
 352                         if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) >= max_addr) {
 353                                 if (md->phys_addr >= max_addr)
 354                                         continue;
 355                                 md->num_pages = (max_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
 356                                 first_non_wb_addr = max_addr;
 357                         }
 358
 359                         if (total_mem >= mem_limit)
 360                                 continue;
 361
 362                         if (total_mem + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) {
 363                                 unsigned long limit_addr = md->phys_addr;
 364
 365                                 limit_addr += mem_limit - total_mem;
 366                                 limit_addr = GRANULEROUNDDOWN(limit_addr);
 367
 368                                 if (md->phys_addr > limit_addr)
 369                                         continue;
 370
 371                                 md->num_pages = (limit_addr - md->phys_addr) >>
 372                                                 EFI_PAGE_SHIFT;
 373                                 first_non_wb_addr = max_addr = md->phys_addr +
 374                                               (md->num_pages << EFI_PAGE_SHIFT);
 375                         }
 376                         total_mem += (md->num_pages << EFI_PAGE_SHIFT);
 377
 378                         if (md->num_pages == 0)
 379                                 continue;
 380
 381                         curr.start = PAGE_OFFSET + md->phys_addr;
 382                         curr.end   = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
 383
 384                         if (!prev_valid) {
 385                                 prev = curr;
 386                                 prev_valid = 1;
 387                         } else {
 388                                 if (curr.start < prev.start)
 389                                         printk(KERN_ERR "Oops: EFI memory table not ordered!\n");
 390
 391                                 if (prev.end == curr.start) {
 392                                         /* merge two consecutive memory ranges */
 393                                         prev.end = curr.end;
 394                                 } else {
 395                                         start = PAGE_ALIGN(prev.start);
 396                                         end = prev.end & PAGE_MASK;
 397                                         if ((end > start) && (*callback)(start, end, arg) < 0)
 398                                                 return;
 399                                         prev = curr;
 400                                 }
 401                         }
 402                 }
 403         }
 404         if (prev_valid) {
 405                 start = PAGE_ALIGN(prev.start);
 406                 end = prev.end & PAGE_MASK;
 407                 if (end > start)
 408                         (*callback)(start, end, arg);
 409         }
 410 }
 411
 412 /*
 413  * Look for the PAL_CODE region reported by EFI and maps it using an
 414  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 415  * Abstraction Layer chapter 11 in ADAG
 416  */
 417
 418 void *
 419 efi_get_pal_addr (void)
 420 {
 421         void *efi_map_start, *efi_map_end, *p;
 422         efi_memory_desc_t *md;
 423         u64 efi_desc_size;
 424         int pal_code_count = 0;
 425         u64 vaddr, mask;
 426
 427         efi_map_start = __va(ia64_boot_param->efi_memmap);
 428         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 429         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 430
 431         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 432                 md = p;
 433                 if (md->type != EFI_PAL_CODE)
 434                         continue;
 435
 436                 if (++pal_code_count > 1) {
 437                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 438                                md->phys_addr);
 439                         continue;
 440                 }
 441                 /*
 442                  * The only ITLB entry in region 7 that is used is the one installed by
 443                  * __start().  That entry covers a 64MB range.
 444                  */
 445                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 446                 vaddr = PAGE_OFFSET + md->phys_addr;
 447
 448                 /*
 449                  * We must check that the PAL mapping won't overlap with the kernel
 450                  * mapping.
 451                  *
 452                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 453                  * 256KB and that only one ITR is needed to map it. This implies that the
 454                  * PAL code is always aligned on its size, i.e., the closest matching page
 455                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 456                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 457                  * now the following test is enough to determine whether or not we need a
 458                  * dedicated ITR for the PAL code.
 459                  */
 460                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 461                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 462                                __FUNCTION__);
 463                         continue;
 464                 }
 465
 466                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 467                         panic("Woah!  PAL code size bigger than a granule!");
 468
 469 #if EFI_DEBUG
 470                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 471
 472                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 473                         smp_processor_id(), md->phys_addr,
 474                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 475                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 476 #endif
 477                 return __va(md->phys_addr);
 478         }
 479         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
 480                __FUNCTION__);
 481         return NULL;
 482 }
 483
 484 void
 485 efi_map_pal_code (void)
 486 {
 487         void *pal_vaddr = efi_get_pal_addr ();
 488         u64 psr;
 489
 490         if (!pal_vaddr)
 491                 return;
 492
 493         /*
 494          * Cannot write to CRx with PSR.ic=1
 495          */
 496         psr = ia64_clear_ic();
 497         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 498                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 499                  IA64_GRANULE_SHIFT);
 500         ia64_set_psr(psr);              /* restore psr */
 501         ia64_srlz_i();
 502 }
 503
 504 void __init
 505 efi_init (void)
 506 {
 507         void *efi_map_start, *efi_map_end;
 508         efi_config_table_t *config_tables;
 509         efi_char16_t *c16;
 510         u64 efi_desc_size;
 511         char *cp, *end, vendor[100] = "unknown";
 512         extern char saved_command_line[];
 513         int i;
 514
 515         /* it's too early to be able to use the standard kernel command line support... */
 516         for (cp = saved_command_line; *cp; ) {
 517                 if (memcmp(cp, "mem=", 4) == 0) {
 518                         cp += 4;
 519                         mem_limit = memparse(cp, &end);
 520                         if (end != cp)
 521                                 break;
 522                         cp = end;
 523                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 524                         cp += 9;
 525                         max_addr = GRANULEROUNDDOWN(memparse(cp, &end));
 526                         if (end != cp)
 527                                 break;
 528                         cp = end;
 529                 } else {
 530                         while (*cp != ' ' && *cp)
 531                                 ++cp;
 532                         while (*cp == ' ')
 533                                 ++cp;
 534                 }
 535         }
 536         if (max_addr != ~0UL)
 537                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 538
 539         efi.systab = __va(ia64_boot_param->efi_systab);
 540
 541         /*
 542          * Verify the EFI Table
 543          */
 544         if (efi.systab == NULL)
 545                 panic("Woah! Can't find EFI system table.\n");
 546         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 547                 panic("Woah! EFI system table signature incorrect\n");
 548         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 549                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 550                        "got %d.%02d, expected %d.%02d\n",
 551                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 552                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 553
 554         config_tables = __va(efi.systab->tables);
 555
 556         /* Show what we know for posterity */
 557         c16 = __va(efi.systab->fw_vendor);
 558         if (c16) {
 559                 for (i = 0;i < (int) sizeof(vendor) && *c16; ++i)
 560                         vendor[i] = *c16++;
 561                 vendor[i] = '\0';
 562         }
 563
 564         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 565                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 566
 567         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 568                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 569                         efi.mps = __va(config_tables[i].table);
 570                         printk(" MPS=0x%lx", config_tables[i].table);
 571                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 572                         efi.acpi20 = __va(config_tables[i].table);
 573                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 574                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 575                         efi.acpi = __va(config_tables[i].table);
 576                         printk(" ACPI=0x%lx", config_tables[i].table);
 577                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 578                         efi.smbios = __va(config_tables[i].table);
 579                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 580                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 581                         efi.sal_systab = __va(config_tables[i].table);
 582                         printk(" SALsystab=0x%lx", config_tables[i].table);
 583                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 584                         efi.hcdp = __va(config_tables[i].table);
 585                         printk(" HCDP=0x%lx", config_tables[i].table);
 586                 }
 587         }
 588         printk("\n");
 589
 590         runtime = __va(efi.systab->runtime);
 591         efi.get_time = phys_get_time;
 592         efi.set_time = phys_set_time;
 593         efi.get_wakeup_time = phys_get_wakeup_time;
 594         efi.set_wakeup_time = phys_set_wakeup_time;
 595         efi.get_variable = phys_get_variable;
 596         efi.get_next_variable = phys_get_next_variable;
 597         efi.set_variable = phys_set_variable;
 598         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 599         efi.reset_system = phys_reset_system;
 600
 601         efi_map_start = __va(ia64_boot_param->efi_memmap);
 602         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 603         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 604
 605 #if EFI_DEBUG
 606         /* print EFI memory map: */
 607         {
 608                 efi_memory_desc_t *md;
 609                 void *p;
 610
 611                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 612                         md = p;
 613                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 614                                i, md->type, md->attribute, md->phys_addr,
 615                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 616                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 617                 }
 618         }
 619 #endif
 620
 621         efi_map_pal_code();
 622         efi_enter_virtual_mode();
 623 }
 624
 625 void
 626 efi_enter_virtual_mode (void)
 627 {
 628         void *efi_map_start, *efi_map_end, *p;
 629         efi_memory_desc_t *md;
 630         efi_status_t status;
 631         u64 efi_desc_size;
 632
 633         efi_map_start = __va(ia64_boot_param->efi_memmap);
 634         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 635         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 636
 637         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 638                 md = p;
 639                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 640                         /*
 641                          * Some descriptors have multiple bits set, so the order of
 642                          * the tests is relevant.
 643                          */
 644                         if (md->attribute & EFI_MEMORY_WB) {
 645                                 md->virt_addr = (u64) __va(md->phys_addr);
 646                         } else if (md->attribute & EFI_MEMORY_UC) {
 647                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 648                         } else if (md->attribute & EFI_MEMORY_WC) {
 649 #if 0
 650                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 651                                                                            | _PAGE_D
 652                                                                            | _PAGE_MA_WC
 653                                                                            | _PAGE_PL_0
 654                                                                            | _PAGE_AR_RW));
 655 #else
 656                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 657                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 658 #endif
 659                         } else if (md->attribute & EFI_MEMORY_WT) {
 660 #if 0
 661                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 662                                                                            | _PAGE_D | _PAGE_MA_WT
 663                                                                            | _PAGE_PL_0
 664                                                                            | _PAGE_AR_RW));
 665 #else
 666                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 667                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 668 #endif
 669                         }
 670                 }
 671         }
 672
 673         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 674                                ia64_boot_param->efi_memmap_size,
 675                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 676                                ia64_boot_param->efi_memmap);
 677         if (status != EFI_SUCCESS) {
 678                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 679                        "(status=%lu)\n", status);
 680                 return;
 681         }
 682
 683         /*
 684          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 685          */
 686         efi.get_time = virt_get_time;
 687         efi.set_time = virt_set_time;
 688         efi.get_wakeup_time = virt_get_wakeup_time;
 689         efi.set_wakeup_time = virt_set_wakeup_time;
 690         efi.get_variable = virt_get_variable;
 691         efi.get_next_variable = virt_get_next_variable;
 692         efi.set_variable = virt_set_variable;
 693         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 694         efi.reset_system = virt_reset_system;
 695 }
 696
 697 /*
 698  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 699  * this type, other I/O port ranges should be described via ACPI.
 700  */
 701 u64
 702 efi_get_iobase (void)
 703 {
 704         void *efi_map_start, *efi_map_end, *p;
 705         efi_memory_desc_t *md;
 706         u64 efi_desc_size;
 707
 708         efi_map_start = __va(ia64_boot_param->efi_memmap);
 709         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 710         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 711
 712         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 713                 md = p;
 714                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 715                         if (md->attribute & EFI_MEMORY_UC)
 716                                 return md->phys_addr;
 717                 }
 718         }
 719         return 0;
 720 }
 721
 722 u32
 723 efi_mem_type (unsigned long phys_addr)
 724 {
 725         void *efi_map_start, *efi_map_end, *p;
 726         efi_memory_desc_t *md;
 727         u64 efi_desc_size;
 728
 729         efi_map_start = __va(ia64_boot_param->efi_memmap);
 730         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 731         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 732
 733         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 734                 md = p;
 735
 736                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 737                          return md->type;
 738         }
 739         return 0;
 740 }
 741
 742 u64
 743 efi_mem_attributes (unsigned long phys_addr)
 744 {
 745         void *efi_map_start, *efi_map_end, *p;
 746         efi_memory_desc_t *md;
 747         u64 efi_desc_size;
 748
 749         efi_map_start = __va(ia64_boot_param->efi_memmap);
 750         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 751         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 752
 753         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 754                 md = p;
 755
 756                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 757                         return md->attribute;
 758         }
 759         return 0;
 760 }
 761 EXPORT_SYMBOL(efi_mem_attributes);
 762
 763 int
 764 valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 765 {
 766         void *efi_map_start, *efi_map_end, *p;
 767         efi_memory_desc_t *md;
 768         u64 efi_desc_size;
 769
 770         efi_map_start = __va(ia64_boot_param->efi_memmap);
 771         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 772         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 773
 774         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 775                 md = p;
 776
 777                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT)) {
 778                         if (!(md->attribute & EFI_MEMORY_WB))
 779                                 return 0;
 780
 781                         if (*size > md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr)
 782                                 *size = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr;
 783                         return 1;
 784                 }
 785         }
 786         return 0;
 787 }
 788
 789 int __init
 790 efi_uart_console_only(void)
 791 {
 792         efi_status_t status;
 793         char *s, name[] = "ConOut";
 794         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 795         efi_char16_t *utf16, name_utf16[32];
 796         unsigned char data[1024];
 797         unsigned long size = sizeof(data);
 798         struct efi_generic_dev_path *hdr, *end_addr;
 799         int uart = 0;
 800
 801         /* Convert to UTF-16 */
 802         utf16 = name_utf16;
 803         s = name;
 804         while (*s)
 805                 *utf16++ = *s++ & 0x7f;
 806         *utf16 = 0;
 807
 808         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 809         if (status != EFI_SUCCESS) {
 810                 printk(KERN_ERR "No EFI %s variable?\n", name);
 811                 return 0;
 812         }
 813
 814         hdr = (struct efi_generic_dev_path *) data;
 815         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 816         while (hdr < end_addr) {
 817                 if (hdr->type == EFI_DEV_MSG &&
 818                     hdr->sub_type == EFI_DEV_MSG_UART)
 819                         uart = 1;
 820                 else if (hdr->type == EFI_DEV_END_PATH ||
 821                           hdr->type == EFI_DEV_END_PATH2) {
 822                         if (!uart)
 823                                 return 0;
 824                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 825                                 return 1;
 826                         uart = 0;
 827                 }
 828                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 829         }
 830         printk(KERN_ERR "Malformed %s value\n", name);
 831         return 0;
 832 }