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 <<<<<<< HEAD:arch/x86/kernel/efi.c
  58 struct efi efi_phys __initdata;
  59 =======
  60 static struct efi efi_phys __initdata;
  61 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/x86/kernel/efi.c
  62 static efi_system_table_t efi_systab __initdata;
  63
  64 static int __init setup_noefi(char *arg)
  65 {
  66         efi_enabled = 0;
  67         return 0;
  68 }
  69 early_param("noefi", setup_noefi);
  70
  71 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  72 {
  73         return efi_call_virt2(get_time, tm, tc);
  74 }
  75
  76 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  77 {
  78         return efi_call_virt1(set_time, tm);
  79 }
  80
  81 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  82                                              efi_bool_t *pending,
  83                                              efi_time_t *tm)
  84 {
  85         return efi_call_virt3(get_wakeup_time,
  86                               enabled, pending, tm);
  87 }
  88
  89 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  90 {
  91         return efi_call_virt2(set_wakeup_time,
  92                               enabled, tm);
  93 }
  94
  95 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
  96                                           efi_guid_t *vendor,
  97                                           u32 *attr,
  98                                           unsigned long *data_size,
  99                                           void *data)
 100 {
 101         return efi_call_virt5(get_variable,
 102                               name, vendor, attr,
 103                               data_size, data);
 104 }
 105
 106 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 107                                                efi_char16_t *name,
 108                                                efi_guid_t *vendor)
 109 {
 110         return efi_call_virt3(get_next_variable,
 111                               name_size, name, vendor);
 112 }
 113
 114 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 115                                           efi_guid_t *vendor,
 116                                           unsigned long attr,
 117                                           unsigned long data_size,
 118                                           void *data)
 119 {
 120         return efi_call_virt5(set_variable,
 121                               name, vendor, attr,
 122                               data_size, data);
 123 }
 124
 125 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 126 {
 127         return efi_call_virt1(get_next_high_mono_count, count);
 128 }
 129
 130 static void virt_efi_reset_system(int reset_type,
 131                                   efi_status_t status,
 132                                   unsigned long data_size,
 133                                   efi_char16_t *data)
 134 {
 135         efi_call_virt4(reset_system, reset_type, status,
 136                        data_size, data);
 137 }
 138
 139 static efi_status_t virt_efi_set_virtual_address_map(
 140         unsigned long memory_map_size,
 141         unsigned long descriptor_size,
 142         u32 descriptor_version,
 143         efi_memory_desc_t *virtual_map)
 144 {
 145         return efi_call_virt4(set_virtual_address_map,
 146                               memory_map_size, descriptor_size,
 147                               descriptor_version, virtual_map);
 148 }
 149
 150 static efi_status_t __init phys_efi_set_virtual_address_map(
 151         unsigned long memory_map_size,
 152         unsigned long descriptor_size,
 153         u32 descriptor_version,
 154         efi_memory_desc_t *virtual_map)
 155 {
 156         efi_status_t status;
 157
 158         efi_call_phys_prelog();
 159         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 160                                 memory_map_size, descriptor_size,
 161                                 descriptor_version, virtual_map);
 162         efi_call_phys_epilog();
 163         return status;
 164 }
 165
 166 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 167                                              efi_time_cap_t *tc)
 168 {
 169         efi_status_t status;
 170
 171         efi_call_phys_prelog();
 172         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 173         efi_call_phys_epilog();
 174         return status;
 175 }
 176
 177 int efi_set_rtc_mmss(unsigned long nowtime)
 178 {
 179         int real_seconds, real_minutes;
 180         efi_status_t    status;
 181         efi_time_t      eft;
 182         efi_time_cap_t  cap;
 183
 184         status = efi.get_time(&eft, &cap);
 185         if (status != EFI_SUCCESS) {
 186                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 187                 return -1;
 188         }
 189
 190         real_seconds = nowtime % 60;
 191         real_minutes = nowtime / 60;
 192         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 193                 real_minutes += 30;
 194         real_minutes %= 60;
 195         eft.minute = real_minutes;
 196         eft.second = real_seconds;
 197
 198         status = efi.set_time(&eft);
 199         if (status != EFI_SUCCESS) {
 200                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 201                 return -1;
 202         }
 203         return 0;
 204 }
 205
 206 unsigned long efi_get_time(void)
 207 {
 208         efi_status_t status;
 209         efi_time_t eft;
 210         efi_time_cap_t cap;
 211
 212         status = efi.get_time(&eft, &cap);
 213         if (status != EFI_SUCCESS)
 214                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 215
 216         return mktime(eft.year, eft.month, eft.day, eft.hour,
 217                       eft.minute, eft.second);
 218 }
 219
 220 #if EFI_DEBUG
 221 static void __init print_efi_memmap(void)
 222 {
 223         efi_memory_desc_t *md;
 224         void *p;
 225         int i;
 226
 227         for (p = memmap.map, i = 0;
 228              p < memmap.map_end;
 229              p += memmap.desc_size, i++) {
 230                 md = p;
 231                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 232                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 233                         i, md->type, md->attribute, md->phys_addr,
 234                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 235                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 236         }
 237 }
 238 #endif  /*  EFI_DEBUG  */
 239
 240 void __init efi_init(void)
 241 {
 242         efi_config_table_t *config_tables;
 243         efi_runtime_services_t *runtime;
 244         efi_char16_t *c16;
 245         char vendor[100] = "unknown";
 246         int i = 0;
 247         void *tmp;
 248
 249 #ifdef CONFIG_X86_32
 250         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 251         memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
 252 #else
 253         efi_phys.systab = (efi_system_table_t *)
 254                 (boot_params.efi_info.efi_systab |
 255                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 256         memmap.phys_map = (void *)
 257                 (boot_params.efi_info.efi_memmap |
 258                  ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 259 #endif
 260         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 261                 boot_params.efi_info.efi_memdesc_size;
 262         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 263         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 264
 265         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 266                                    sizeof(efi_system_table_t));
 267         if (efi.systab == NULL)
 268                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 269         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 270         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 271         efi.systab = &efi_systab;
 272
 273         /*
 274          * Verify the EFI Table
 275          */
 276         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 277                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 278         if ((efi.systab->hdr.revision >> 16) == 0)
 279                 printk(KERN_ERR "Warning: EFI system table version "
 280                        "%d.%02d, expected 1.00 or greater!\n",
 281                        efi.systab->hdr.revision >> 16,
 282                        efi.systab->hdr.revision & 0xffff);
 283
 284         /*
 285          * Show what we know for posterity
 286          */
 287         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 288         if (c16) {
 289                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 290                         vendor[i] = *c16++;
 291                 vendor[i] = '\0';
 292         } else
 293                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 294         early_iounmap(tmp, 2);
 295
 296         printk(KERN_INFO "EFI v%u.%.02u by %s \n",
 297                efi.systab->hdr.revision >> 16,
 298                efi.systab->hdr.revision & 0xffff, vendor);
 299
 300         /*
 301          * Let's see what config tables the firmware passed to us.
 302          */
 303         config_tables = early_ioremap(
 304                 efi.systab->tables,
 305                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 306         if (config_tables == NULL)
 307                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 308
 309         printk(KERN_INFO);
 310         for (i = 0; i < efi.systab->nr_tables; i++) {
 311                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 312                         efi.mps = config_tables[i].table;
 313                         printk(" MPS=0x%lx ", config_tables[i].table);
 314                 } else if (!efi_guidcmp(config_tables[i].guid,
 315                                         ACPI_20_TABLE_GUID)) {
 316                         efi.acpi20 = config_tables[i].table;
 317                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 318                 } else if (!efi_guidcmp(config_tables[i].guid,
 319                                         ACPI_TABLE_GUID)) {
 320                         efi.acpi = config_tables[i].table;
 321                         printk(" ACPI=0x%lx ", config_tables[i].table);
 322                 } else if (!efi_guidcmp(config_tables[i].guid,
 323                                         SMBIOS_TABLE_GUID)) {
 324                         efi.smbios = config_tables[i].table;
 325                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 326                 } else if (!efi_guidcmp(config_tables[i].guid,
 327                                         HCDP_TABLE_GUID)) {
 328                         efi.hcdp = config_tables[i].table;
 329                         printk(" HCDP=0x%lx ", config_tables[i].table);
 330                 } else if (!efi_guidcmp(config_tables[i].guid,
 331                                         UGA_IO_PROTOCOL_GUID)) {
 332                         efi.uga = config_tables[i].table;
 333                         printk(" UGA=0x%lx ", config_tables[i].table);
 334                 }
 335         }
 336         printk("\n");
 337         early_iounmap(config_tables,
 338                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 339
 340         /*
 341          * Check out the runtime services table. We need to map
 342          * the runtime services table so that we can grab the physical
 343          * address of several of the EFI runtime functions, needed to
 344          * set the firmware into virtual mode.
 345          */
 346         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 347                                 sizeof(efi_runtime_services_t));
 348         if (runtime != NULL) {
 349                 /*
 350                  * We will only need *early* access to the following
 351                  * two EFI runtime services before set_virtual_address_map
 352                  * is invoked.
 353                  */
 354                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 355                 efi_phys.set_virtual_address_map =
 356                         (efi_set_virtual_address_map_t *)
 357                         runtime->set_virtual_address_map;
 358                 /*
 359                  * Make efi_get_time can be called before entering
 360                  * virtual mode.
 361                  */
 362                 efi.get_time = phys_efi_get_time;
 363         } else
 364                 printk(KERN_ERR "Could not map the EFI runtime service "
 365                        "table!\n");
 366         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 367
 368         /* Map the EFI memory map */
 369         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 370                                    memmap.nr_map * memmap.desc_size);
 371         if (memmap.map == NULL)
 372                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 373         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 374         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 375                 printk(KERN_WARNING "Kernel-defined memdesc"
 376                        "doesn't match the one from EFI!\n");
 377
 378         /* Setup for EFI runtime service */
 379         reboot_type = BOOT_EFI;
 380
 381 #if EFI_DEBUG
 382         print_efi_memmap();
 383 #endif
 384 }
 385
 386 static void __init runtime_code_page_mkexec(void)
 387 {
 388         efi_memory_desc_t *md;
 389         void *p;
 390
 391         /* Make EFI runtime service code area executable */
 392         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 393                 md = p;
 394
 395                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 396                         continue;
 397
 398                 set_memory_x(md->virt_addr, md->num_pages);
 399         }
 400 }
 401
 402 /*
 403  * This function will switch the EFI runtime services to virtual mode.
 404  * Essentially, look through the EFI memmap and map every region that
 405  * has the runtime attribute bit set in its memory descriptor and update
 406  * that memory descriptor with the virtual address obtained from ioremap().
 407  * This enables the runtime services to be called without having to
 408  * thunk back into physical mode for every invocation.
 409  */
 410 void __init efi_enter_virtual_mode(void)
 411 {
 412         efi_memory_desc_t *md;
 413         efi_status_t status;
 414         unsigned long size;
 415         u64 end, systab;
 416         void *p, *va;
 417
 418         efi.systab = NULL;
 419         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 420                 md = p;
 421                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 422                         continue;
 423
 424                 size = md->num_pages << EFI_PAGE_SHIFT;
 425                 end = md->phys_addr + size;
 426
 427                 if ((end >> PAGE_SHIFT) <= max_pfn_mapped)
 428                         va = __va(md->phys_addr);
 429                 else
 430                         va = efi_ioremap(md->phys_addr, size);
 431
 432                 md->virt_addr = (u64) (unsigned long) va;
 433
 434                 if (!va) {
 435                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 436                                (unsigned long long)md->phys_addr);
 437                         continue;
 438                 }
 439
 440                 if (!(md->attribute & EFI_MEMORY_WB))
 441                         set_memory_uc(md->virt_addr, md->num_pages);
 442
 443                 systab = (u64) (unsigned long) efi_phys.systab;
 444                 if (md->phys_addr <= systab && systab < end) {
 445                         systab += md->virt_addr - md->phys_addr;
 446                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 447                 }
 448         }
 449
 450         BUG_ON(!efi.systab);
 451
 452         status = phys_efi_set_virtual_address_map(
 453                 memmap.desc_size * memmap.nr_map,
 454                 memmap.desc_size,
 455                 memmap.desc_version,
 456                 memmap.phys_map);
 457
 458         if (status != EFI_SUCCESS) {
 459                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 460                        "(status=%lx)!\n", status);
 461                 panic("EFI call to SetVirtualAddressMap() failed!");
 462         }
 463
 464         /*
 465          * Now that EFI is in virtual mode, update the function
 466          * pointers in the runtime service table to the new virtual addresses.
 467          *
 468          * Call EFI services through wrapper functions.
 469          */
 470         efi.get_time = virt_efi_get_time;
 471         efi.set_time = virt_efi_set_time;
 472         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 473         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 474         efi.get_variable = virt_efi_get_variable;
 475         efi.get_next_variable = virt_efi_get_next_variable;
 476         efi.set_variable = virt_efi_set_variable;
 477         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 478         efi.reset_system = virt_efi_reset_system;
 479         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 480         if (__supported_pte_mask & _PAGE_NX)
 481                 runtime_code_page_mkexec();
 482         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 483         memmap.map = NULL;
 484 }
 485
 486 /*
 487  * Convenience functions to obtain memory types and attributes
 488  */
 489 u32 efi_mem_type(unsigned long phys_addr)
 490 {
 491         efi_memory_desc_t *md;
 492         void *p;
 493
 494         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 495                 md = p;
 496                 if ((md->phys_addr <= phys_addr) &&
 497                     (phys_addr < (md->phys_addr +
 498                                   (md->num_pages << EFI_PAGE_SHIFT))))
 499                         return md->type;
 500         }
 501         return 0;
 502 }
 503
 504 u64 efi_mem_attributes(unsigned long phys_addr)
 505 {
 506         efi_memory_desc_t *md;
 507         void *p;
 508
 509         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 510                 md = p;
 511                 if ((md->phys_addr <= phys_addr) &&
 512                     (phys_addr < (md->phys_addr +
 513                                   (md->num_pages << EFI_PAGE_SHIFT))))
 514                         return md->attribute;
 515         }
 516         return 0;
 517 }