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                 add_memory_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         pmap = boot_params.efi_info.efi_memmap;
 246 #ifdef CONFIG_X86_64
 247         pmap += (__u64)boot_params.efi_info.efi_memmap_hi << 32;
 248 #endif
 249         memmap.phys_map = (void *)pmap;
 250         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 251                 boot_params.efi_info.efi_memdesc_size;
 252         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 253         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 254         reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
 255                       "EFI memmap");
 256 }
 257
 258 #if EFI_DEBUG
 259 static void __init print_efi_memmap(void)
 260 {
 261         efi_memory_desc_t *md;
 262         void *p;
 263         int i;
 264
 265         for (p = memmap.map, i = 0;
 266              p < memmap.map_end;
 267              p += memmap.desc_size, i++) {
 268                 md = p;
 269                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 270                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 271                         i, md->type, md->attribute, md->phys_addr,
 272                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 273                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 274         }
 275 }
 276 #endif  /*  EFI_DEBUG  */
 277
 278 void __init efi_init(void)
 279 {
 280         efi_config_table_t *config_tables;
 281         efi_runtime_services_t *runtime;
 282         efi_char16_t *c16;
 283         char vendor[100] = "unknown";
 284         int i = 0;
 285         void *tmp;
 286
 287         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 288 #ifdef CONFIG_X86_64
 289         efi_phys.systab = (void *)efi_phys.systab +
 290                 ((__u64)boot_params.efi_info.efi_systab_hi<<32);
 291 #endif
 292
 293         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 294                                    sizeof(efi_system_table_t));
 295         if (efi.systab == NULL)
 296                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 297         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 298         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 299         efi.systab = &efi_systab;
 300
 301         /*
 302          * Verify the EFI Table
 303          */
 304         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 305                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 306         if ((efi.systab->hdr.revision >> 16) == 0)
 307                 printk(KERN_ERR "Warning: EFI system table version "
 308                        "%d.%02d, expected 1.00 or greater!\n",
 309                        efi.systab->hdr.revision >> 16,
 310                        efi.systab->hdr.revision & 0xffff);
 311
 312         /*
 313          * Show what we know for posterity
 314          */
 315         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 316         if (c16) {
 317                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 318                         vendor[i] = *c16++;
 319                 vendor[i] = '\0';
 320         } else
 321                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 322         early_iounmap(tmp, 2);
 323
 324         printk(KERN_INFO "EFI v%u.%.02u by %s \n",
 325                efi.systab->hdr.revision >> 16,
 326                efi.systab->hdr.revision & 0xffff, vendor);
 327
 328         /*
 329          * Let's see what config tables the firmware passed to us.
 330          */
 331         config_tables = early_ioremap(
 332                 efi.systab->tables,
 333                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 334         if (config_tables == NULL)
 335                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 336
 337         printk(KERN_INFO);
 338         for (i = 0; i < efi.systab->nr_tables; i++) {
 339                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 340                         efi.mps = config_tables[i].table;
 341                         printk(" MPS=0x%lx ", config_tables[i].table);
 342                 } else if (!efi_guidcmp(config_tables[i].guid,
 343                                         ACPI_20_TABLE_GUID)) {
 344                         efi.acpi20 = config_tables[i].table;
 345                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 346                 } else if (!efi_guidcmp(config_tables[i].guid,
 347                                         ACPI_TABLE_GUID)) {
 348                         efi.acpi = config_tables[i].table;
 349                         printk(" ACPI=0x%lx ", config_tables[i].table);
 350                 } else if (!efi_guidcmp(config_tables[i].guid,
 351                                         SMBIOS_TABLE_GUID)) {
 352                         efi.smbios = config_tables[i].table;
 353                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 354                 } else if (!efi_guidcmp(config_tables[i].guid,
 355                                         HCDP_TABLE_GUID)) {
 356                         efi.hcdp = config_tables[i].table;
 357                         printk(" HCDP=0x%lx ", config_tables[i].table);
 358                 } else if (!efi_guidcmp(config_tables[i].guid,
 359                                         UGA_IO_PROTOCOL_GUID)) {
 360                         efi.uga = config_tables[i].table;
 361                         printk(" UGA=0x%lx ", config_tables[i].table);
 362                 }
 363         }
 364         printk("\n");
 365         early_iounmap(config_tables,
 366                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 367
 368         /*
 369          * Check out the runtime services table. We need to map
 370          * the runtime services table so that we can grab the physical
 371          * address of several of the EFI runtime functions, needed to
 372          * set the firmware into virtual mode.
 373          */
 374         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 375                                 sizeof(efi_runtime_services_t));
 376         if (runtime != NULL) {
 377                 /*
 378                  * We will only need *early* access to the following
 379                  * two EFI runtime services before set_virtual_address_map
 380                  * is invoked.
 381                  */
 382                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 383                 efi_phys.set_virtual_address_map =
 384                         (efi_set_virtual_address_map_t *)
 385                         runtime->set_virtual_address_map;
 386                 /*
 387                  * Make efi_get_time can be called before entering
 388                  * virtual mode.
 389                  */
 390                 efi.get_time = phys_efi_get_time;
 391         } else
 392                 printk(KERN_ERR "Could not map the EFI runtime service "
 393                        "table!\n");
 394         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 395
 396         /* Map the EFI memory map */
 397         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 398                                    memmap.nr_map * memmap.desc_size);
 399         if (memmap.map == NULL)
 400                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 401         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 402         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 403                 printk(KERN_WARNING "Kernel-defined memdesc"
 404                        "doesn't match the one from EFI!\n");
 405         add_efi_memmap();
 406
 407         /* Setup for EFI runtime service */
 408         reboot_type = BOOT_EFI;
 409
 410 #if EFI_DEBUG
 411         print_efi_memmap();
 412 #endif
 413 }
 414
 415 static void __init runtime_code_page_mkexec(void)
 416 {
 417         efi_memory_desc_t *md;
 418         void *p;
 419         u64 addr, npages;
 420
 421         /* Make EFI runtime service code area executable */
 422         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 423                 md = p;
 424
 425                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 426                         continue;
 427
 428                 addr = md->virt_addr;
 429                 npages = md->num_pages;
 430                 memrange_efi_to_native(&addr, &npages);
 431                 set_memory_x(addr, npages);
 432         }
 433 }
 434
 435 /*
 436  * This function will switch the EFI runtime services to virtual mode.
 437  * Essentially, look through the EFI memmap and map every region that
 438  * has the runtime attribute bit set in its memory descriptor and update
 439  * that memory descriptor with the virtual address obtained from ioremap().
 440  * This enables the runtime services to be called without having to
 441  * thunk back into physical mode for every invocation.
 442  */
 443 void __init efi_enter_virtual_mode(void)
 444 {
 445         efi_memory_desc_t *md;
 446         efi_status_t status;
 447         unsigned long size;
 448         u64 end, systab, addr, npages;
 449         void *p, *va;
 450
 451         efi.systab = NULL;
 452         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 453                 md = p;
 454                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 455                         continue;
 456
 457                 size = md->num_pages << EFI_PAGE_SHIFT;
 458                 end = md->phys_addr + size;
 459
 460                 if (PFN_UP(end) <= max_pfn_mapped)
 461                         va = __va(md->phys_addr);
 462                 else
 463                         va = efi_ioremap(md->phys_addr, size);
 464
 465                 md->virt_addr = (u64) (unsigned long) va;
 466
 467                 if (!va) {
 468                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 469                                (unsigned long long)md->phys_addr);
 470                         continue;
 471                 }
 472
 473                 if (!(md->attribute & EFI_MEMORY_WB)) {
 474                         addr = md->virt_addr;
 475                         npages = md->num_pages;
 476                         memrange_efi_to_native(&addr, &npages);
 477                         set_memory_uc(addr, npages);
 478                 }
 479
 480                 systab = (u64) (unsigned long) efi_phys.systab;
 481                 if (md->phys_addr <= systab && systab < end) {
 482                         systab += md->virt_addr - md->phys_addr;
 483                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 484                 }
 485         }
 486
 487         BUG_ON(!efi.systab);
 488
 489         status = phys_efi_set_virtual_address_map(
 490                 memmap.desc_size * memmap.nr_map,
 491                 memmap.desc_size,
 492                 memmap.desc_version,
 493                 memmap.phys_map);
 494
 495         if (status != EFI_SUCCESS) {
 496                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 497                        "(status=%lx)!\n", status);
 498                 panic("EFI call to SetVirtualAddressMap() failed!");
 499         }
 500
 501         /*
 502          * Now that EFI is in virtual mode, update the function
 503          * pointers in the runtime service table to the new virtual addresses.
 504          *
 505          * Call EFI services through wrapper functions.
 506          */
 507         efi.get_time = virt_efi_get_time;
 508         efi.set_time = virt_efi_set_time;
 509         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 510         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 511         efi.get_variable = virt_efi_get_variable;
 512         efi.get_next_variable = virt_efi_get_next_variable;
 513         efi.set_variable = virt_efi_set_variable;
 514         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 515         efi.reset_system = virt_efi_reset_system;
 516         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 517         if (__supported_pte_mask & _PAGE_NX)
 518                 runtime_code_page_mkexec();
 519         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 520         memmap.map = NULL;
 521 }
 522
 523 /*
 524  * Convenience functions to obtain memory types and attributes
 525  */
 526 u32 efi_mem_type(unsigned long phys_addr)
 527 {
 528         efi_memory_desc_t *md;
 529         void *p;
 530
 531         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 532                 md = p;
 533                 if ((md->phys_addr <= phys_addr) &&
 534                     (phys_addr < (md->phys_addr +
 535                                   (md->num_pages << EFI_PAGE_SHIFT))))
 536                         return md->type;
 537         }
 538         return 0;
 539 }
 540
 541 u64 efi_mem_attributes(unsigned long phys_addr)
 542 {
 543         efi_memory_desc_t *md;
 544         void *p;
 545
 546         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 547                 md = p;
 548                 if ((md->phys_addr <= phys_addr) &&
 549                     (phys_addr < (md->phys_addr +
 550                                   (md->num_pages << EFI_PAGE_SHIFT))))
 551                         return md->attribute;
 552         }
 553         return 0;
 554 }