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  * Walk the EFI memory map to pull out leftover pages in the lower
 414  * memory regions which do not end up in the regular memory map and
 415  * stick them into the uncached allocator
 416  *
 417  * The regular walk function is significantly more complex than the
 418  * uncached walk which means it really doesn't make sense to try and
 419  * marge the two.
 420  */
 421 void __init
 422 efi_memmap_walk_uc (efi_freemem_callback_t callback)
 423 {
 424         void *efi_map_start, *efi_map_end, *p;
 425         efi_memory_desc_t *md;
 426         u64 efi_desc_size, start, end;
 427
 428         efi_map_start = __va(ia64_boot_param->efi_memmap);
 429         efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
 430         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 431
 432         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 433                 md = p;
 434                 if (md->attribute == EFI_MEMORY_UC) {
 435                         start = PAGE_ALIGN(md->phys_addr);
 436                         end = PAGE_ALIGN((md->phys_addr+(md->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK);
 437                         if ((*callback)(start, end, NULL) < 0)
 438                                 return;
 439                 }
 440         }
 441 }
 442
 443
 444 /*
 445  * Look for the PAL_CODE region reported by EFI and maps it using an
 446  * ITR to enable safe PAL calls in virtual mode.  See IA-64 Processor
 447  * Abstraction Layer chapter 11 in ADAG
 448  */
 449
 450 void *
 451 efi_get_pal_addr (void)
 452 {
 453         void *efi_map_start, *efi_map_end, *p;
 454         efi_memory_desc_t *md;
 455         u64 efi_desc_size;
 456         int pal_code_count = 0;
 457         u64 vaddr, mask;
 458
 459         efi_map_start = __va(ia64_boot_param->efi_memmap);
 460         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 461         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 462
 463         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 464                 md = p;
 465                 if (md->type != EFI_PAL_CODE)
 466                         continue;
 467
 468                 if (++pal_code_count > 1) {
 469                         printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
 470                                md->phys_addr);
 471                         continue;
 472                 }
 473                 /*
 474                  * The only ITLB entry in region 7 that is used is the one installed by
 475                  * __start().  That entry covers a 64MB range.
 476                  */
 477                 mask  = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
 478                 vaddr = PAGE_OFFSET + md->phys_addr;
 479
 480                 /*
 481                  * We must check that the PAL mapping won't overlap with the kernel
 482                  * mapping.
 483                  *
 484                  * PAL code is guaranteed to be aligned on a power of 2 between 4k and
 485                  * 256KB and that only one ITR is needed to map it. This implies that the
 486                  * PAL code is always aligned on its size, i.e., the closest matching page
 487                  * size supported by the TLB. Therefore PAL code is guaranteed never to
 488                  * cross a 64MB unless it is bigger than 64MB (very unlikely!).  So for
 489                  * now the following test is enough to determine whether or not we need a
 490                  * dedicated ITR for the PAL code.
 491                  */
 492                 if ((vaddr & mask) == (KERNEL_START & mask)) {
 493                         printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
 494                                __FUNCTION__);
 495                         continue;
 496                 }
 497
 498                 if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
 499                         panic("Woah!  PAL code size bigger than a granule!");
 500
 501 #if EFI_DEBUG
 502                 mask  = ~((1 << IA64_GRANULE_SHIFT) - 1);
 503
 504                 printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
 505                         smp_processor_id(), md->phys_addr,
 506                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 507                         vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
 508 #endif
 509                 return __va(md->phys_addr);
 510         }
 511         printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
 512                __FUNCTION__);
 513         return NULL;
 514 }
 515
 516 void
 517 efi_map_pal_code (void)
 518 {
 519         void *pal_vaddr = efi_get_pal_addr ();
 520         u64 psr;
 521
 522         if (!pal_vaddr)
 523                 return;
 524
 525         /*
 526          * Cannot write to CRx with PSR.ic=1
 527          */
 528         psr = ia64_clear_ic();
 529         ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
 530                  pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
 531                  IA64_GRANULE_SHIFT);
 532         ia64_set_psr(psr);              /* restore psr */
 533         ia64_srlz_i();
 534 }
 535
 536 void __init
 537 efi_init (void)
 538 {
 539         void *efi_map_start, *efi_map_end;
 540         efi_config_table_t *config_tables;
 541         efi_char16_t *c16;
 542         u64 efi_desc_size;
 543         char *cp, *end, vendor[100] = "unknown";
 544         extern char saved_command_line[];
 545         int i;
 546
 547         /* it's too early to be able to use the standard kernel command line support... */
 548         for (cp = saved_command_line; *cp; ) {
 549                 if (memcmp(cp, "mem=", 4) == 0) {
 550                         cp += 4;
 551                         mem_limit = memparse(cp, &end);
 552                         if (end != cp)
 553                                 break;
 554                         cp = end;
 555                 } else if (memcmp(cp, "max_addr=", 9) == 0) {
 556                         cp += 9;
 557                         max_addr = GRANULEROUNDDOWN(memparse(cp, &end));
 558                         if (end != cp)
 559                                 break;
 560                         cp = end;
 561                 } else {
 562                         while (*cp != ' ' && *cp)
 563                                 ++cp;
 564                         while (*cp == ' ')
 565                                 ++cp;
 566                 }
 567         }
 568         if (max_addr != ~0UL)
 569                 printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
 570
 571         efi.systab = __va(ia64_boot_param->efi_systab);
 572
 573         /*
 574          * Verify the EFI Table
 575          */
 576         if (efi.systab == NULL)
 577                 panic("Woah! Can't find EFI system table.\n");
 578         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 579                 panic("Woah! EFI system table signature incorrect\n");
 580         if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
 581                 printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
 582                        "got %d.%02d, expected %d.%02d\n",
 583                        efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
 584                        EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
 585
 586         config_tables = __va(efi.systab->tables);
 587
 588         /* Show what we know for posterity */
 589         c16 = __va(efi.systab->fw_vendor);
 590         if (c16) {
 591                 for (i = 0;i < (int) sizeof(vendor) && *c16; ++i)
 592                         vendor[i] = *c16++;
 593                 vendor[i] = '\0';
 594         }
 595
 596         printk(KERN_INFO "EFI v%u.%.02u by %s:",
 597                efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
 598
 599         for (i = 0; i < (int) efi.systab->nr_tables; i++) {
 600                 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
 601                         efi.mps = __va(config_tables[i].table);
 602                         printk(" MPS=0x%lx", config_tables[i].table);
 603                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
 604                         efi.acpi20 = __va(config_tables[i].table);
 605                         printk(" ACPI 2.0=0x%lx", config_tables[i].table);
 606                 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
 607                         efi.acpi = __va(config_tables[i].table);
 608                         printk(" ACPI=0x%lx", config_tables[i].table);
 609                 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
 610                         efi.smbios = __va(config_tables[i].table);
 611                         printk(" SMBIOS=0x%lx", config_tables[i].table);
 612                 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
 613                         efi.sal_systab = __va(config_tables[i].table);
 614                         printk(" SALsystab=0x%lx", config_tables[i].table);
 615                 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
 616                         efi.hcdp = __va(config_tables[i].table);
 617                         printk(" HCDP=0x%lx", config_tables[i].table);
 618                 }
 619         }
 620         printk("\n");
 621
 622         runtime = __va(efi.systab->runtime);
 623         efi.get_time = phys_get_time;
 624         efi.set_time = phys_set_time;
 625         efi.get_wakeup_time = phys_get_wakeup_time;
 626         efi.set_wakeup_time = phys_set_wakeup_time;
 627         efi.get_variable = phys_get_variable;
 628         efi.get_next_variable = phys_get_next_variable;
 629         efi.set_variable = phys_set_variable;
 630         efi.get_next_high_mono_count = phys_get_next_high_mono_count;
 631         efi.reset_system = phys_reset_system;
 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 #if EFI_DEBUG
 638         /* print EFI memory map: */
 639         {
 640                 efi_memory_desc_t *md;
 641                 void *p;
 642
 643                 for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
 644                         md = p;
 645                         printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
 646                                i, md->type, md->attribute, md->phys_addr,
 647                                md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 648                                md->num_pages >> (20 - EFI_PAGE_SHIFT));
 649                 }
 650         }
 651 #endif
 652
 653         efi_map_pal_code();
 654         efi_enter_virtual_mode();
 655 }
 656
 657 void
 658 efi_enter_virtual_mode (void)
 659 {
 660         void *efi_map_start, *efi_map_end, *p;
 661         efi_memory_desc_t *md;
 662         efi_status_t status;
 663         u64 efi_desc_size;
 664
 665         efi_map_start = __va(ia64_boot_param->efi_memmap);
 666         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 667         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 668
 669         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 670                 md = p;
 671                 if (md->attribute & EFI_MEMORY_RUNTIME) {
 672                         /*
 673                          * Some descriptors have multiple bits set, so the order of
 674                          * the tests is relevant.
 675                          */
 676                         if (md->attribute & EFI_MEMORY_WB) {
 677                                 md->virt_addr = (u64) __va(md->phys_addr);
 678                         } else if (md->attribute & EFI_MEMORY_UC) {
 679                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 680                         } else if (md->attribute & EFI_MEMORY_WC) {
 681 #if 0
 682                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 683                                                                            | _PAGE_D
 684                                                                            | _PAGE_MA_WC
 685                                                                            | _PAGE_PL_0
 686                                                                            | _PAGE_AR_RW));
 687 #else
 688                                 printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
 689                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 690 #endif
 691                         } else if (md->attribute & EFI_MEMORY_WT) {
 692 #if 0
 693                                 md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
 694                                                                            | _PAGE_D | _PAGE_MA_WT
 695                                                                            | _PAGE_PL_0
 696                                                                            | _PAGE_AR_RW));
 697 #else
 698                                 printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
 699                                 md->virt_addr = (u64) ioremap(md->phys_addr, 0);
 700 #endif
 701                         }
 702                 }
 703         }
 704
 705         status = efi_call_phys(__va(runtime->set_virtual_address_map),
 706                                ia64_boot_param->efi_memmap_size,
 707                                efi_desc_size, ia64_boot_param->efi_memdesc_version,
 708                                ia64_boot_param->efi_memmap);
 709         if (status != EFI_SUCCESS) {
 710                 printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
 711                        "(status=%lu)\n", status);
 712                 return;
 713         }
 714
 715         /*
 716          * Now that EFI is in virtual mode, we call the EFI functions more efficiently:
 717          */
 718         efi.get_time = virt_get_time;
 719         efi.set_time = virt_set_time;
 720         efi.get_wakeup_time = virt_get_wakeup_time;
 721         efi.set_wakeup_time = virt_set_wakeup_time;
 722         efi.get_variable = virt_get_variable;
 723         efi.get_next_variable = virt_get_next_variable;
 724         efi.set_variable = virt_set_variable;
 725         efi.get_next_high_mono_count = virt_get_next_high_mono_count;
 726         efi.reset_system = virt_reset_system;
 727 }
 728
 729 /*
 730  * Walk the EFI memory map looking for the I/O port range.  There can only be one entry of
 731  * this type, other I/O port ranges should be described via ACPI.
 732  */
 733 u64
 734 efi_get_iobase (void)
 735 {
 736         void *efi_map_start, *efi_map_end, *p;
 737         efi_memory_desc_t *md;
 738         u64 efi_desc_size;
 739
 740         efi_map_start = __va(ia64_boot_param->efi_memmap);
 741         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 742         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 743
 744         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 745                 md = p;
 746                 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
 747                         if (md->attribute & EFI_MEMORY_UC)
 748                                 return md->phys_addr;
 749                 }
 750         }
 751         return 0;
 752 }
 753
 754 u32
 755 efi_mem_type (unsigned long phys_addr)
 756 {
 757         void *efi_map_start, *efi_map_end, *p;
 758         efi_memory_desc_t *md;
 759         u64 efi_desc_size;
 760
 761         efi_map_start = __va(ia64_boot_param->efi_memmap);
 762         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 763         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 764
 765         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 766                 md = p;
 767
 768                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 769                          return md->type;
 770         }
 771         return 0;
 772 }
 773
 774 u64
 775 efi_mem_attributes (unsigned long phys_addr)
 776 {
 777         void *efi_map_start, *efi_map_end, *p;
 778         efi_memory_desc_t *md;
 779         u64 efi_desc_size;
 780
 781         efi_map_start = __va(ia64_boot_param->efi_memmap);
 782         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 783         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 784
 785         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 786                 md = p;
 787
 788                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
 789                         return md->attribute;
 790         }
 791         return 0;
 792 }
 793 EXPORT_SYMBOL(efi_mem_attributes);
 794
 795 int
 796 valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 797 {
 798         void *efi_map_start, *efi_map_end, *p;
 799         efi_memory_desc_t *md;
 800         u64 efi_desc_size;
 801
 802         efi_map_start = __va(ia64_boot_param->efi_memmap);
 803         efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
 804         efi_desc_size = ia64_boot_param->efi_memdesc_size;
 805
 806         for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
 807                 md = p;
 808
 809                 if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT)) {
 810                         if (!(md->attribute & EFI_MEMORY_WB))
 811                                 return 0;
 812
 813                         if (*size > md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr)
 814                                 *size = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - phys_addr;
 815                         return 1;
 816                 }
 817         }
 818         return 0;
 819 }
 820
 821 int __init
 822 efi_uart_console_only(void)
 823 {
 824         efi_status_t status;
 825         char *s, name[] = "ConOut";
 826         efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
 827         efi_char16_t *utf16, name_utf16[32];
 828         unsigned char data[1024];
 829         unsigned long size = sizeof(data);
 830         struct efi_generic_dev_path *hdr, *end_addr;
 831         int uart = 0;
 832
 833         /* Convert to UTF-16 */
 834         utf16 = name_utf16;
 835         s = name;
 836         while (*s)
 837                 *utf16++ = *s++ & 0x7f;
 838         *utf16 = 0;
 839
 840         status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
 841         if (status != EFI_SUCCESS) {
 842                 printk(KERN_ERR "No EFI %s variable?\n", name);
 843                 return 0;
 844         }
 845
 846         hdr = (struct efi_generic_dev_path *) data;
 847         end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
 848         while (hdr < end_addr) {
 849                 if (hdr->type == EFI_DEV_MSG &&
 850                     hdr->sub_type == EFI_DEV_MSG_UART)
 851                         uart = 1;
 852                 else if (hdr->type == EFI_DEV_END_PATH ||
 853                           hdr->type == EFI_DEV_END_PATH2) {
 854                         if (!uart)
 855                                 return 0;
 856                         if (hdr->sub_type == EFI_DEV_END_ENTIRE)
 857                                 return 1;
 858                         uart = 0;
 859                 }
 860                 hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
 861         }
 862         printk(KERN_ERR "Malformed %s value\n", name);
 863         return 0;
 864 }