err.no Git - linux-2.6/blob - arch/x86/kernel/efi.c

   1 /*
   2  * Common EFI (Extensible Firmware Interface) support functions
   3  * Based on Extensible Firmware Interface Specification version 1.0
   4  *
   5  * Copyright (C) 1999 VA Linux Systems
   6  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
   7  * Copyright (C) 1999-2002 Hewlett-Packard Co.
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  *      Stephane Eranian <eranian@hpl.hp.com>
  10  * Copyright (C) 2005-2008 Intel Co.
  11  *      Fenghua Yu <fenghua.yu@intel.com>
  12  *      Bibo Mao <bibo.mao@intel.com>
  13  *      Chandramouli Narayanan <mouli@linux.intel.com>
  14  *      Huang Ying <ying.huang@intel.com>
  15  *
  16  * Copied from efi_32.c to eliminate the duplicated code between EFI
  17  * 32/64 support code. --ying 2007-10-26
  18  *
  19  * All EFI Runtime Services are not implemented yet as EFI only
  20  * supports physical mode addressing on SoftSDV. This is to be fixed
  21  * in a future version.  --drummond 1999-07-20
  22  *
  23  * Implemented EFI runtime services and virtual mode calls.  --davidm
  24  *
  25  * Goutham Rao: <goutham.rao@intel.com>
  26  *      Skip non-WB memory and ignore empty memory ranges.
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <linux/efi.h>
  32 #include <linux/bootmem.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/time.h>
  36 #include <linux/io.h>
  37 #include <linux/reboot.h>
  38 #include <linux/bcd.h>
  39
  40 #include <asm/setup.h>
  41 #include <asm/efi.h>
  42 #include <asm/time.h>
  43 #include <asm/cacheflush.h>
  44 #include <asm/tlbflush.h>
  45
  46 #define EFI_DEBUG       1
  47 #define PFX             "EFI: "
  48
  49 int efi_enabled;
  50 EXPORT_SYMBOL(efi_enabled);
  51
  52 struct efi efi;
  53 EXPORT_SYMBOL(efi);
  54
  55 struct efi_memory_map memmap;
  56
  57 static struct efi efi_phys __initdata;
  58 static efi_system_table_t efi_systab __initdata;
  59
  60 static int __init setup_noefi(char *arg)
  61 {
  62         efi_enabled = 0;
  63         return 0;
  64 }
  65 early_param("noefi", setup_noefi);
  66
  67 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  68 {
  69         return efi_call_virt2(get_time, tm, tc);
  70 }
  71
  72 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  73 {
  74         return efi_call_virt1(set_time, tm);
  75 }
  76
  77 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  78                                              efi_bool_t *pending,
  79                                              efi_time_t *tm)
  80 {
  81         return efi_call_virt3(get_wakeup_time,
  82                               enabled, pending, tm);
  83 }
  84
  85 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  86 {
  87         return efi_call_virt2(set_wakeup_time,
  88                               enabled, tm);
  89 }
  90
  91 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
  92                                           efi_guid_t *vendor,
  93                                           u32 *attr,
  94                                           unsigned long *data_size,
  95                                           void *data)
  96 {
  97         return efi_call_virt5(get_variable,
  98                               name, vendor, attr,
  99                               data_size, data);
 100 }
 101
 102 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 103                                                efi_char16_t *name,
 104                                                efi_guid_t *vendor)
 105 {
 106         return efi_call_virt3(get_next_variable,
 107                               name_size, name, vendor);
 108 }
 109
 110 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 111                                           efi_guid_t *vendor,
 112                                           unsigned long attr,
 113                                           unsigned long data_size,
 114                                           void *data)
 115 {
 116         return efi_call_virt5(set_variable,
 117                               name, vendor, attr,
 118                               data_size, data);
 119 }
 120
 121 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 122 {
 123         return efi_call_virt1(get_next_high_mono_count, count);
 124 }
 125
 126 static void virt_efi_reset_system(int reset_type,
 127                                   efi_status_t status,
 128                                   unsigned long data_size,
 129                                   efi_char16_t *data)
 130 {
 131         efi_call_virt4(reset_system, reset_type, status,
 132                        data_size, data);
 133 }
 134
 135 static efi_status_t virt_efi_set_virtual_address_map(
 136         unsigned long memory_map_size,
 137         unsigned long descriptor_size,
 138         u32 descriptor_version,
 139         efi_memory_desc_t *virtual_map)
 140 {
 141         return efi_call_virt4(set_virtual_address_map,
 142                               memory_map_size, descriptor_size,
 143                               descriptor_version, virtual_map);
 144 }
 145
 146 static efi_status_t __init phys_efi_set_virtual_address_map(
 147         unsigned long memory_map_size,
 148         unsigned long descriptor_size,
 149         u32 descriptor_version,
 150         efi_memory_desc_t *virtual_map)
 151 {
 152         efi_status_t status;
 153
 154         efi_call_phys_prelog();
 155         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 156                                 memory_map_size, descriptor_size,
 157                                 descriptor_version, virtual_map);
 158         efi_call_phys_epilog();
 159         return status;
 160 }
 161
 162 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 163                                              efi_time_cap_t *tc)
 164 {
 165         efi_status_t status;
 166
 167         efi_call_phys_prelog();
 168         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 169         efi_call_phys_epilog();
 170         return status;
 171 }
 172
 173 int efi_set_rtc_mmss(unsigned long nowtime)
 174 {
 175         int real_seconds, real_minutes;
 176         efi_status_t    status;
 177         efi_time_t      eft;
 178         efi_time_cap_t  cap;
 179
 180         status = efi.get_time(&eft, &cap);
 181         if (status != EFI_SUCCESS) {
 182                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 183                 return -1;
 184         }
 185
 186         real_seconds = nowtime % 60;
 187         real_minutes = nowtime / 60;
 188         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 189                 real_minutes += 30;
 190         real_minutes %= 60;
 191         eft.minute = real_minutes;
 192         eft.second = real_seconds;
 193
 194         status = efi.set_time(&eft);
 195         if (status != EFI_SUCCESS) {
 196                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 197                 return -1;
 198         }
 199         return 0;
 200 }
 201
 202 unsigned long efi_get_time(void)
 203 {
 204         efi_status_t status;
 205         efi_time_t eft;
 206         efi_time_cap_t cap;
 207
 208         status = efi.get_time(&eft, &cap);
 209         if (status != EFI_SUCCESS)
 210                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 211
 212         return mktime(eft.year, eft.month, eft.day, eft.hour,
 213                       eft.minute, eft.second);
 214 }
 215
 216 /*
 217  * Tell the kernel about the EFI memory map.  This might include
 218  * more than the max 128 entries that can fit in the e820 legacy
 219  * (zeropage) memory map.
 220  */
 221
 222 static void __init add_efi_memmap(void)
 223 {
 224         void *p;
 225
 226         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 227                 efi_memory_desc_t *md = p;
 228                 unsigned long long start = md->phys_addr;
 229                 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
 230                 int e820_type;
 231
 232                 if (md->attribute & EFI_MEMORY_WB)
 233                         e820_type = E820_RAM;
 234                 else
 235                         e820_type = E820_RESERVED;
 236                 e820_add_region(start, size, e820_type);
 237         }
 238         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 239 }
 240
 241 void __init efi_reserve_early(void)
 242 {
 243         unsigned long pmap;
 244
 245 #ifdef CONFIG_X86_32
 246         pmap = boot_params.efi_info.efi_memmap;
 247 #else
 248         pmap = (boot_params.efi_info.efi_memmap |
 249                 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 250 #endif
 251         memmap.phys_map = (void *)pmap;
 252         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 253                 boot_params.efi_info.efi_memdesc_size;
 254         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 255         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 256         reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
 257                       "EFI memmap");
 258 }
 259
 260 #if EFI_DEBUG
 261 static void __init print_efi_memmap(void)
 262 {
 263         efi_memory_desc_t *md;
 264         void *p;
 265         int i;
 266
 267         for (p = memmap.map, i = 0;
 268              p < memmap.map_end;
 269              p += memmap.desc_size, i++) {
 270                 md = p;
 271                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 272                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 273                         i, md->type, md->attribute, md->phys_addr,
 274                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 275                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 276         }
 277 }
 278 #endif  /*  EFI_DEBUG  */
 279
 280 void __init efi_init(void)
 281 {
 282         efi_config_table_t *config_tables;
 283         efi_runtime_services_t *runtime;
 284         efi_char16_t *c16;
 285         char vendor[100] = "unknown";
 286         int i = 0;
 287         void *tmp;
 288
 289 #ifdef CONFIG_X86_32
 290         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 291 #else
 292         efi_phys.systab = (efi_system_table_t *)
 293                 (boot_params.efi_info.efi_systab |
 294                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 295 #endif
 296
 297         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 298                                    sizeof(efi_system_table_t));
 299         if (efi.systab == NULL)
 300                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 301         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 302         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 303         efi.systab = &efi_systab;
 304
 305         /*
 306          * Verify the EFI Table
 307          */
 308         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 309                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 310         if ((efi.systab->hdr.revision >> 16) == 0)
 311                 printk(KERN_ERR "Warning: EFI system table version "
 312                        "%d.%02d, expected 1.00 or greater!\n",
 313                        efi.systab->hdr.revision >> 16,
 314                        efi.systab->hdr.revision & 0xffff);
 315
 316         /*
 317          * Show what we know for posterity
 318          */
 319         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 320         if (c16) {
 321                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 322                         vendor[i] = *c16++;
 323                 vendor[i] = '\0';
 324         } else
 325                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 326         early_iounmap(tmp, 2);
 327
 328         printk(KERN_INFO "EFI v%u.%.02u by %s \n",
 329                efi.systab->hdr.revision >> 16,
 330                efi.systab->hdr.revision & 0xffff, vendor);
 331
 332         /*
 333          * Let's see what config tables the firmware passed to us.
 334          */
 335         config_tables = early_ioremap(
 336                 efi.systab->tables,
 337                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 338         if (config_tables == NULL)
 339                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 340
 341         printk(KERN_INFO);
 342         for (i = 0; i < efi.systab->nr_tables; i++) {
 343                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 344                         efi.mps = config_tables[i].table;
 345                         printk(" MPS=0x%lx ", config_tables[i].table);
 346                 } else if (!efi_guidcmp(config_tables[i].guid,
 347                                         ACPI_20_TABLE_GUID)) {
 348                         efi.acpi20 = config_tables[i].table;
 349                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 350                 } else if (!efi_guidcmp(config_tables[i].guid,
 351                                         ACPI_TABLE_GUID)) {
 352                         efi.acpi = config_tables[i].table;
 353                         printk(" ACPI=0x%lx ", config_tables[i].table);
 354                 } else if (!efi_guidcmp(config_tables[i].guid,
 355                                         SMBIOS_TABLE_GUID)) {
 356                         efi.smbios = config_tables[i].table;
 357                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 358                 } else if (!efi_guidcmp(config_tables[i].guid,
 359                                         HCDP_TABLE_GUID)) {
 360                         efi.hcdp = config_tables[i].table;
 361                         printk(" HCDP=0x%lx ", config_tables[i].table);
 362                 } else if (!efi_guidcmp(config_tables[i].guid,
 363                                         UGA_IO_PROTOCOL_GUID)) {
 364                         efi.uga = config_tables[i].table;
 365                         printk(" UGA=0x%lx ", config_tables[i].table);
 366                 }
 367         }
 368         printk("\n");
 369         early_iounmap(config_tables,
 370                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 371
 372         /*
 373          * Check out the runtime services table. We need to map
 374          * the runtime services table so that we can grab the physical
 375          * address of several of the EFI runtime functions, needed to
 376          * set the firmware into virtual mode.
 377          */
 378         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 379                                 sizeof(efi_runtime_services_t));
 380         if (runtime != NULL) {
 381                 /*
 382                  * We will only need *early* access to the following
 383                  * two EFI runtime services before set_virtual_address_map
 384                  * is invoked.
 385                  */
 386                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 387                 efi_phys.set_virtual_address_map =
 388                         (efi_set_virtual_address_map_t *)
 389                         runtime->set_virtual_address_map;
 390                 /*
 391                  * Make efi_get_time can be called before entering
 392                  * virtual mode.
 393                  */
 394                 efi.get_time = phys_efi_get_time;
 395         } else
 396                 printk(KERN_ERR "Could not map the EFI runtime service "
 397                        "table!\n");
 398         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 399
 400         /* Map the EFI memory map */
 401         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 402                                    memmap.nr_map * memmap.desc_size);
 403         if (memmap.map == NULL)
 404                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 405         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 406         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 407                 printk(KERN_WARNING "Kernel-defined memdesc"
 408                        "doesn't match the one from EFI!\n");
 409         add_efi_memmap();
 410
 411         /* Setup for EFI runtime service */
 412         reboot_type = BOOT_EFI;
 413
 414 #if EFI_DEBUG
 415         print_efi_memmap();
 416 #endif
 417 }
 418
 419 static void __init runtime_code_page_mkexec(void)
 420 {
 421         efi_memory_desc_t *md;
 422         void *p;
 423         u64 addr, npages;
 424
 425         /* Make EFI runtime service code area executable */
 426         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 427                 md = p;
 428
 429                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 430                         continue;
 431
 432                 addr = md->virt_addr;
 433                 npages = md->num_pages;
 434                 memrange_efi_to_native(&addr, &npages);
 435                 set_memory_x(addr, npages);
 436         }
 437 }
 438
 439 /*
 440  * This function will switch the EFI runtime services to virtual mode.
 441  * Essentially, look through the EFI memmap and map every region that
 442  * has the runtime attribute bit set in its memory descriptor and update
 443  * that memory descriptor with the virtual address obtained from ioremap().
 444  * This enables the runtime services to be called without having to
 445  * thunk back into physical mode for every invocation.
 446  */
 447 void __init efi_enter_virtual_mode(void)
 448 {
 449         efi_memory_desc_t *md;
 450         efi_status_t status;
 451         unsigned long size;
 452         u64 end, systab, addr, npages;
 453         void *p, *va;
 454
 455         efi.systab = NULL;
 456         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 457                 md = p;
 458                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 459                         continue;
 460
 461                 size = md->num_pages << EFI_PAGE_SHIFT;
 462                 end = md->phys_addr + size;
 463
 464                 if (PFN_UP(end) <= max_pfn_mapped)
 465                         va = __va(md->phys_addr);
 466                 else
 467                         va = efi_ioremap(md->phys_addr, size);
 468
 469                 md->virt_addr = (u64) (unsigned long) va;
 470
 471                 if (!va) {
 472                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 473                                (unsigned long long)md->phys_addr);
 474                         continue;
 475                 }
 476
 477                 if (!(md->attribute & EFI_MEMORY_WB)) {
 478                         addr = md->virt_addr;
 479                         npages = md->num_pages;
 480                         memrange_efi_to_native(&addr, &npages);
 481                         set_memory_uc(addr, npages);
 482                 }
 483
 484                 systab = (u64) (unsigned long) efi_phys.systab;
 485                 if (md->phys_addr <= systab && systab < end) {
 486                         systab += md->virt_addr - md->phys_addr;
 487                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 488                 }
 489         }
 490
 491         BUG_ON(!efi.systab);
 492
 493         status = phys_efi_set_virtual_address_map(
 494                 memmap.desc_size * memmap.nr_map,
 495                 memmap.desc_size,
 496                 memmap.desc_version,
 497                 memmap.phys_map);
 498
 499         if (status != EFI_SUCCESS) {
 500                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 501                        "(status=%lx)!\n", status);
 502                 panic("EFI call to SetVirtualAddressMap() failed!");
 503         }
 504
 505         /*
 506          * Now that EFI is in virtual mode, update the function
 507          * pointers in the runtime service table to the new virtual addresses.
 508          *
 509          * Call EFI services through wrapper functions.
 510          */
 511         efi.get_time = virt_efi_get_time;
 512         efi.set_time = virt_efi_set_time;
 513         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 514         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 515         efi.get_variable = virt_efi_get_variable;
 516         efi.get_next_variable = virt_efi_get_next_variable;
 517         efi.set_variable = virt_efi_set_variable;
 518         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 519         efi.reset_system = virt_efi_reset_system;
 520         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 521         if (__supported_pte_mask & _PAGE_NX)
 522                 runtime_code_page_mkexec();
 523         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 524         memmap.map = NULL;
 525 }
 526
 527 /*
 528  * Convenience functions to obtain memory types and attributes
 529  */
 530 u32 efi_mem_type(unsigned long phys_addr)
 531 {
 532         efi_memory_desc_t *md;
 533         void *p;
 534
 535         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 536                 md = p;
 537                 if ((md->phys_addr <= phys_addr) &&
 538                     (phys_addr < (md->phys_addr +
 539                                   (md->num_pages << EFI_PAGE_SHIFT))))
 540                         return md->type;
 541         }
 542         return 0;
 543 }
 544
 545 u64 efi_mem_attributes(unsigned long phys_addr)
 546 {
 547         efi_memory_desc_t *md;
 548         void *p;
 549
 550         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 551                 md = p;
 552                 if ((md->phys_addr <= phys_addr) &&
 553                     (phys_addr < (md->phys_addr +
 554                                   (md->num_pages << EFI_PAGE_SHIFT))))
 555                         return md->attribute;
 556         }
 557         return 0;
 558 }