git.oblomov.eu 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
  44 #define EFI_DEBUG       1
  45 #define PFX             "EFI: "
  46
  47 int efi_enabled;
  48 EXPORT_SYMBOL(efi_enabled);
  49
  50 struct efi efi;
  51 EXPORT_SYMBOL(efi);
  52
  53 struct efi_memory_map memmap;
  54
  55 struct efi efi_phys __initdata;
  56 static efi_system_table_t efi_systab __initdata;
  57
  58 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  59 {
  60         return efi_call_virt2(get_time, tm, tc);
  61 }
  62
  63 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  64 {
  65         return efi_call_virt1(set_time, tm);
  66 }
  67
  68 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  69                                              efi_bool_t *pending,
  70                                              efi_time_t *tm)
  71 {
  72         return efi_call_virt3(get_wakeup_time,
  73                               enabled, pending, tm);
  74 }
  75
  76 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  77 {
  78         return efi_call_virt2(set_wakeup_time,
  79                               enabled, tm);
  80 }
  81
  82 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
  83                                           efi_guid_t *vendor,
  84                                           u32 *attr,
  85                                           unsigned long *data_size,
  86                                           void *data)
  87 {
  88         return efi_call_virt5(get_variable,
  89                               name, vendor, attr,
  90                               data_size, data);
  91 }
  92
  93 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
  94                                                efi_char16_t *name,
  95                                                efi_guid_t *vendor)
  96 {
  97         return efi_call_virt3(get_next_variable,
  98                               name_size, name, vendor);
  99 }
 100
 101 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 102                                           efi_guid_t *vendor,
 103                                           unsigned long attr,
 104                                           unsigned long data_size,
 105                                           void *data)
 106 {
 107         return efi_call_virt5(set_variable,
 108                               name, vendor, attr,
 109                               data_size, data);
 110 }
 111
 112 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 113 {
 114         return efi_call_virt1(get_next_high_mono_count, count);
 115 }
 116
 117 static void virt_efi_reset_system(int reset_type,
 118                                   efi_status_t status,
 119                                   unsigned long data_size,
 120                                   efi_char16_t *data)
 121 {
 122         efi_call_virt4(reset_system, reset_type, status,
 123                        data_size, data);
 124 }
 125
 126 static efi_status_t virt_efi_set_virtual_address_map(
 127         unsigned long memory_map_size,
 128         unsigned long descriptor_size,
 129         u32 descriptor_version,
 130         efi_memory_desc_t *virtual_map)
 131 {
 132         return efi_call_virt4(set_virtual_address_map,
 133                               memory_map_size, descriptor_size,
 134                               descriptor_version, virtual_map);
 135 }
 136
 137 static efi_status_t __init phys_efi_set_virtual_address_map(
 138         unsigned long memory_map_size,
 139         unsigned long descriptor_size,
 140         u32 descriptor_version,
 141         efi_memory_desc_t *virtual_map)
 142 {
 143         efi_status_t status;
 144
 145         efi_call_phys_prelog();
 146         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 147                                 memory_map_size, descriptor_size,
 148                                 descriptor_version, virtual_map);
 149         efi_call_phys_epilog();
 150         return status;
 151 }
 152
 153 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 154                                              efi_time_cap_t *tc)
 155 {
 156         efi_status_t status;
 157
 158         efi_call_phys_prelog();
 159         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 160         efi_call_phys_epilog();
 161         return status;
 162 }
 163
 164 int efi_set_rtc_mmss(unsigned long nowtime)
 165 {
 166         int real_seconds, real_minutes;
 167         efi_status_t    status;
 168         efi_time_t      eft;
 169         efi_time_cap_t  cap;
 170
 171         status = efi.get_time(&eft, &cap);
 172         if (status != EFI_SUCCESS) {
 173                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 174                 return -1;
 175         }
 176
 177         real_seconds = nowtime % 60;
 178         real_minutes = nowtime / 60;
 179         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 180                 real_minutes += 30;
 181         real_minutes %= 60;
 182         eft.minute = real_minutes;
 183         eft.second = real_seconds;
 184
 185         status = efi.set_time(&eft);
 186         if (status != EFI_SUCCESS) {
 187                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 188                 return -1;
 189         }
 190         return 0;
 191 }
 192
 193 unsigned long efi_get_time(void)
 194 {
 195         efi_status_t status;
 196         efi_time_t eft;
 197         efi_time_cap_t cap;
 198
 199         status = efi.get_time(&eft, &cap);
 200         if (status != EFI_SUCCESS)
 201                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 202
 203         return mktime(eft.year, eft.month, eft.day, eft.hour,
 204                       eft.minute, eft.second);
 205 }
 206
 207 #if EFI_DEBUG
 208 static void __init print_efi_memmap(void)
 209 {
 210         efi_memory_desc_t *md;
 211         void *p;
 212         int i;
 213
 214         for (p = memmap.map, i = 0;
 215              p < memmap.map_end;
 216              p += memmap.desc_size, i++) {
 217                 md = p;
 218                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 219                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 220                         i, md->type, md->attribute, md->phys_addr,
 221                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 222                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 223         }
 224 }
 225 #endif  /*  EFI_DEBUG  */
 226
 227 void __init efi_init(void)
 228 {
 229         efi_config_table_t *config_tables;
 230         efi_runtime_services_t *runtime;
 231         efi_char16_t *c16;
 232         char vendor[100] = "unknown";
 233         int i = 0;
 234         void *tmp;
 235
 236 #ifdef CONFIG_X86_32
 237         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 238         memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
 239 #else
 240         efi_phys.systab = (efi_system_table_t *)
 241                 (boot_params.efi_info.efi_systab |
 242                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 243         memmap.phys_map = (void *)
 244                 (boot_params.efi_info.efi_memmap |
 245                  ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 246 #endif
 247         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 248                 boot_params.efi_info.efi_memdesc_size;
 249         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 250         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 251
 252         efi.systab = efi_early_ioremap((unsigned long)efi_phys.systab,
 253                                        sizeof(efi_system_table_t));
 254         if (efi.systab == NULL)
 255                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 256         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 257         efi_early_iounmap(efi.systab, sizeof(efi_system_table_t));
 258         efi.systab = &efi_systab;
 259
 260         /*
 261          * Verify the EFI Table
 262          */
 263         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 264                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 265         if ((efi.systab->hdr.revision >> 16) == 0)
 266                 printk(KERN_ERR "Warning: EFI system table version "
 267                        "%d.%02d, expected 1.00 or greater!\n",
 268                        efi.systab->hdr.revision >> 16,
 269                        efi.systab->hdr.revision & 0xffff);
 270
 271         /*
 272          * Show what we know for posterity
 273          */
 274         c16 = tmp = efi_early_ioremap(efi.systab->fw_vendor, 2);
 275         if (c16) {
 276                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 277                         vendor[i] = *c16++;
 278                 vendor[i] = '\0';
 279         } else
 280                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 281         efi_early_iounmap(tmp, 2);
 282
 283         printk(KERN_INFO "EFI v%u.%.02u by %s \n",
 284                efi.systab->hdr.revision >> 16,
 285                efi.systab->hdr.revision & 0xffff, vendor);
 286
 287         /*
 288          * Let's see what config tables the firmware passed to us.
 289          */
 290         config_tables = efi_early_ioremap(
 291                 efi.systab->tables,
 292                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 293         if (config_tables == NULL)
 294                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 295
 296         printk(KERN_INFO);
 297         for (i = 0; i < efi.systab->nr_tables; i++) {
 298                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 299                         efi.mps = config_tables[i].table;
 300                         printk(" MPS=0x%lx ", config_tables[i].table);
 301                 } else if (!efi_guidcmp(config_tables[i].guid,
 302                                         ACPI_20_TABLE_GUID)) {
 303                         efi.acpi20 = config_tables[i].table;
 304                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 305                 } else if (!efi_guidcmp(config_tables[i].guid,
 306                                         ACPI_TABLE_GUID)) {
 307                         efi.acpi = config_tables[i].table;
 308                         printk(" ACPI=0x%lx ", config_tables[i].table);
 309                 } else if (!efi_guidcmp(config_tables[i].guid,
 310                                         SMBIOS_TABLE_GUID)) {
 311                         efi.smbios = config_tables[i].table;
 312                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 313                 } else if (!efi_guidcmp(config_tables[i].guid,
 314                                         HCDP_TABLE_GUID)) {
 315                         efi.hcdp = config_tables[i].table;
 316                         printk(" HCDP=0x%lx ", config_tables[i].table);
 317                 } else if (!efi_guidcmp(config_tables[i].guid,
 318                                         UGA_IO_PROTOCOL_GUID)) {
 319                         efi.uga = config_tables[i].table;
 320                         printk(" UGA=0x%lx ", config_tables[i].table);
 321                 }
 322         }
 323         printk("\n");
 324         efi_early_iounmap(config_tables,
 325                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 326
 327         /*
 328          * Check out the runtime services table. We need to map
 329          * the runtime services table so that we can grab the physical
 330          * address of several of the EFI runtime functions, needed to
 331          * set the firmware into virtual mode.
 332          */
 333         runtime = efi_early_ioremap((unsigned long)efi.systab->runtime,
 334                                     sizeof(efi_runtime_services_t));
 335         if (runtime != NULL) {
 336                 /*
 337                  * We will only need *early* access to the following
 338                  * two EFI runtime services before set_virtual_address_map
 339                  * is invoked.
 340                  */
 341                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 342                 efi_phys.set_virtual_address_map =
 343                         (efi_set_virtual_address_map_t *)
 344                         runtime->set_virtual_address_map;
 345                 /*
 346                  * Make efi_get_time can be called before entering
 347                  * virtual mode.
 348                  */
 349                 efi.get_time = phys_efi_get_time;
 350         } else
 351                 printk(KERN_ERR "Could not map the EFI runtime service "
 352                        "table!\n");
 353         efi_early_iounmap(runtime, sizeof(efi_runtime_services_t));
 354
 355         /* Map the EFI memory map */
 356         memmap.map = efi_early_ioremap((unsigned long)memmap.phys_map,
 357                                        memmap.nr_map * memmap.desc_size);
 358         if (memmap.map == NULL)
 359                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 360         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 361         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 362                 printk(KERN_WARNING "Kernel-defined memdesc"
 363                        "doesn't match the one from EFI!\n");
 364
 365 #ifdef CONFIG_X86_64
 366         /* Setup for EFI runtime service */
 367         reboot_type = BOOT_EFI;
 368
 369 #endif
 370 #if EFI_DEBUG
 371         print_efi_memmap();
 372 #endif
 373 }
 374
 375 /*
 376  * This function will switch the EFI runtime services to virtual mode.
 377  * Essentially, look through the EFI memmap and map every region that
 378  * has the runtime attribute bit set in its memory descriptor and update
 379  * that memory descriptor with the virtual address obtained from ioremap().
 380  * This enables the runtime services to be called without having to
 381  * thunk back into physical mode for every invocation.
 382  */
 383 void __init efi_enter_virtual_mode(void)
 384 {
 385         efi_memory_desc_t *md;
 386         efi_status_t status;
 387         unsigned long end;
 388         void *p;
 389
 390         efi.systab = NULL;
 391         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 392                 md = p;
 393                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 394                         continue;
 395                 if ((md->attribute & EFI_MEMORY_WB) &&
 396                     (((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >>
 397                       PAGE_SHIFT) < end_pfn_map))
 398                         md->virt_addr = (unsigned long)__va(md->phys_addr);
 399                 else
 400                         md->virt_addr = (unsigned long)
 401                                 efi_ioremap(md->phys_addr,
 402                                             md->num_pages << EFI_PAGE_SHIFT);
 403                 if (!md->virt_addr)
 404                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 405                                (unsigned long long)md->phys_addr);
 406                 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
 407                 if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
 408                     ((unsigned long)efi_phys.systab < end))
 409                         efi.systab = (efi_system_table_t *)(unsigned long)
 410                                 (md->virt_addr - md->phys_addr +
 411                                  (unsigned long)efi_phys.systab);
 412         }
 413
 414         BUG_ON(!efi.systab);
 415
 416         status = phys_efi_set_virtual_address_map(
 417                 memmap.desc_size * memmap.nr_map,
 418                 memmap.desc_size,
 419                 memmap.desc_version,
 420                 memmap.phys_map);
 421
 422         if (status != EFI_SUCCESS) {
 423                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 424                        "(status=%lx)!\n", status);
 425                 panic("EFI call to SetVirtualAddressMap() failed!");
 426         }
 427
 428         /*
 429          * Now that EFI is in virtual mode, update the function
 430          * pointers in the runtime service table to the new virtual addresses.
 431          *
 432          * Call EFI services through wrapper functions.
 433          */
 434         efi.get_time = virt_efi_get_time;
 435         efi.set_time = virt_efi_set_time;
 436         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 437         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 438         efi.get_variable = virt_efi_get_variable;
 439         efi.get_next_variable = virt_efi_get_next_variable;
 440         efi.set_variable = virt_efi_set_variable;
 441         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 442         efi.reset_system = virt_efi_reset_system;
 443         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 444 #ifdef CONFIG_X86_64
 445         runtime_code_page_mkexec();
 446 #endif
 447 }
 448
 449 /*
 450  * Convenience functions to obtain memory types and attributes
 451  */
 452 u32 efi_mem_type(unsigned long phys_addr)
 453 {
 454         efi_memory_desc_t *md;
 455         void *p;
 456
 457         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 458                 md = p;
 459                 if ((md->phys_addr <= phys_addr) &&
 460                     (phys_addr < (md->phys_addr +
 461                                   (md->num_pages << EFI_PAGE_SHIFT))))
 462                         return md->type;
 463         }
 464         return 0;
 465 }
 466
 467 u64 efi_mem_attributes(unsigned long phys_addr)
 468 {
 469         efi_memory_desc_t *md;
 470         void *p;
 471
 472         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 473                 md = p;
 474                 if ((md->phys_addr <= phys_addr) &&
 475                     (phys_addr < (md->phys_addr +
 476                                   (md->num_pages << EFI_PAGE_SHIFT))))
 477                         return md->attribute;
 478         }
 479         return 0;
 480 }