git.oblomov.eu Git - linux-2.6/blob - arch/ia64/kernel/efi.c

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