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 int __init setup_noefi(char *arg)
  59 {
  60         efi_enabled = 0;
  61         return 0;
  62 }
  63 early_param("noefi", setup_noefi);
  64
  65 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  66 {
  67         return efi_call_virt2(get_time, tm, tc);
  68 }
  69
  70 static efi_status_t virt_efi_set_time(efi_time_t *tm)
  71 {
  72         return efi_call_virt1(set_time, tm);
  73 }
  74
  75 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
  76                                              efi_bool_t *pending,
  77                                              efi_time_t *tm)
  78 {
  79         return efi_call_virt3(get_wakeup_time,
  80                               enabled, pending, tm);
  81 }
  82
  83 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  84 {
  85         return efi_call_virt2(set_wakeup_time,
  86                               enabled, tm);
  87 }
  88
  89 static efi_status_t virt_efi_get_variable(efi_char16_t *name,
  90                                           efi_guid_t *vendor,
  91                                           u32 *attr,
  92                                           unsigned long *data_size,
  93                                           void *data)
  94 {
  95         return efi_call_virt5(get_variable,
  96                               name, vendor, attr,
  97                               data_size, data);
  98 }
  99
 100 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
 101                                                efi_char16_t *name,
 102                                                efi_guid_t *vendor)
 103 {
 104         return efi_call_virt3(get_next_variable,
 105                               name_size, name, vendor);
 106 }
 107
 108 static efi_status_t virt_efi_set_variable(efi_char16_t *name,
 109                                           efi_guid_t *vendor,
 110                                           unsigned long attr,
 111                                           unsigned long data_size,
 112                                           void *data)
 113 {
 114         return efi_call_virt5(set_variable,
 115                               name, vendor, attr,
 116                               data_size, data);
 117 }
 118
 119 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
 120 {
 121         return efi_call_virt1(get_next_high_mono_count, count);
 122 }
 123
 124 static void virt_efi_reset_system(int reset_type,
 125                                   efi_status_t status,
 126                                   unsigned long data_size,
 127                                   efi_char16_t *data)
 128 {
 129         efi_call_virt4(reset_system, reset_type, status,
 130                        data_size, data);
 131 }
 132
 133 static efi_status_t virt_efi_set_virtual_address_map(
 134         unsigned long memory_map_size,
 135         unsigned long descriptor_size,
 136         u32 descriptor_version,
 137         efi_memory_desc_t *virtual_map)
 138 {
 139         return efi_call_virt4(set_virtual_address_map,
 140                               memory_map_size, descriptor_size,
 141                               descriptor_version, virtual_map);
 142 }
 143
 144 static efi_status_t __init phys_efi_set_virtual_address_map(
 145         unsigned long memory_map_size,
 146         unsigned long descriptor_size,
 147         u32 descriptor_version,
 148         efi_memory_desc_t *virtual_map)
 149 {
 150         efi_status_t status;
 151
 152         efi_call_phys_prelog();
 153         status = efi_call_phys4(efi_phys.set_virtual_address_map,
 154                                 memory_map_size, descriptor_size,
 155                                 descriptor_version, virtual_map);
 156         efi_call_phys_epilog();
 157         return status;
 158 }
 159
 160 static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
 161                                              efi_time_cap_t *tc)
 162 {
 163         efi_status_t status;
 164
 165         efi_call_phys_prelog();
 166         status = efi_call_phys2(efi_phys.get_time, tm, tc);
 167         efi_call_phys_epilog();
 168         return status;
 169 }
 170
 171 int efi_set_rtc_mmss(unsigned long nowtime)
 172 {
 173         int real_seconds, real_minutes;
 174         efi_status_t    status;
 175         efi_time_t      eft;
 176         efi_time_cap_t  cap;
 177
 178         status = efi.get_time(&eft, &cap);
 179         if (status != EFI_SUCCESS) {
 180                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 181                 return -1;
 182         }
 183
 184         real_seconds = nowtime % 60;
 185         real_minutes = nowtime / 60;
 186         if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
 187                 real_minutes += 30;
 188         real_minutes %= 60;
 189         eft.minute = real_minutes;
 190         eft.second = real_seconds;
 191
 192         status = efi.set_time(&eft);
 193         if (status != EFI_SUCCESS) {
 194                 printk(KERN_ERR "Oops: efitime: can't write time!\n");
 195                 return -1;
 196         }
 197         return 0;
 198 }
 199
 200 unsigned long efi_get_time(void)
 201 {
 202         efi_status_t status;
 203         efi_time_t eft;
 204         efi_time_cap_t cap;
 205
 206         status = efi.get_time(&eft, &cap);
 207         if (status != EFI_SUCCESS)
 208                 printk(KERN_ERR "Oops: efitime: can't read time!\n");
 209
 210         return mktime(eft.year, eft.month, eft.day, eft.hour,
 211                       eft.minute, eft.second);
 212 }
 213
 214 #if EFI_DEBUG
 215 static void __init print_efi_memmap(void)
 216 {
 217         efi_memory_desc_t *md;
 218         void *p;
 219         int i;
 220
 221         for (p = memmap.map, i = 0;
 222              p < memmap.map_end;
 223              p += memmap.desc_size, i++) {
 224                 md = p;
 225                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 226                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 227                         i, md->type, md->attribute, md->phys_addr,
 228                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 229                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 230         }
 231 }
 232 #endif  /*  EFI_DEBUG  */
 233
 234 void __init efi_init(void)
 235 {
 236         efi_config_table_t *config_tables;
 237         efi_runtime_services_t *runtime;
 238         efi_char16_t *c16;
 239         char vendor[100] = "unknown";
 240         int i = 0;
 241         void *tmp;
 242
 243 #ifdef CONFIG_X86_32
 244         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 245         memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
 246 #else
 247         efi_phys.systab = (efi_system_table_t *)
 248                 (boot_params.efi_info.efi_systab |
 249                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 250         memmap.phys_map = (void *)
 251                 (boot_params.efi_info.efi_memmap |
 252                  ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 253 #endif
 254         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 255                 boot_params.efi_info.efi_memdesc_size;
 256         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 257         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 258
 259         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 260                                    sizeof(efi_system_table_t));
 261         if (efi.systab == NULL)
 262                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 263         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 264         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 265         efi.systab = &efi_systab;
 266
 267         /*
 268          * Verify the EFI Table
 269          */
 270         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 271                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 272         if ((efi.systab->hdr.revision >> 16) == 0)
 273                 printk(KERN_ERR "Warning: EFI system table version "
 274                        "%d.%02d, expected 1.00 or greater!\n",
 275                        efi.systab->hdr.revision >> 16,
 276                        efi.systab->hdr.revision & 0xffff);
 277
 278         /*
 279          * Show what we know for posterity
 280          */
 281         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 282         if (c16) {
 283                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 284                         vendor[i] = *c16++;
 285                 vendor[i] = '\0';
 286         } else
 287                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 288         early_iounmap(tmp, 2);
 289
 290         printk(KERN_INFO "EFI v%u.%.02u by %s \n",
 291                efi.systab->hdr.revision >> 16,
 292                efi.systab->hdr.revision & 0xffff, vendor);
 293
 294         /*
 295          * Let's see what config tables the firmware passed to us.
 296          */
 297         config_tables = early_ioremap(
 298                 efi.systab->tables,
 299                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 300         if (config_tables == NULL)
 301                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 302
 303         printk(KERN_INFO);
 304         for (i = 0; i < efi.systab->nr_tables; i++) {
 305                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 306                         efi.mps = config_tables[i].table;
 307                         printk(" MPS=0x%lx ", config_tables[i].table);
 308                 } else if (!efi_guidcmp(config_tables[i].guid,
 309                                         ACPI_20_TABLE_GUID)) {
 310                         efi.acpi20 = config_tables[i].table;
 311                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 312                 } else if (!efi_guidcmp(config_tables[i].guid,
 313                                         ACPI_TABLE_GUID)) {
 314                         efi.acpi = config_tables[i].table;
 315                         printk(" ACPI=0x%lx ", config_tables[i].table);
 316                 } else if (!efi_guidcmp(config_tables[i].guid,
 317                                         SMBIOS_TABLE_GUID)) {
 318                         efi.smbios = config_tables[i].table;
 319                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 320                 } else if (!efi_guidcmp(config_tables[i].guid,
 321                                         HCDP_TABLE_GUID)) {
 322                         efi.hcdp = config_tables[i].table;
 323                         printk(" HCDP=0x%lx ", config_tables[i].table);
 324                 } else if (!efi_guidcmp(config_tables[i].guid,
 325                                         UGA_IO_PROTOCOL_GUID)) {
 326                         efi.uga = config_tables[i].table;
 327                         printk(" UGA=0x%lx ", config_tables[i].table);
 328                 }
 329         }
 330         printk("\n");
 331         early_iounmap(config_tables,
 332                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 333
 334         /*
 335          * Check out the runtime services table. We need to map
 336          * the runtime services table so that we can grab the physical
 337          * address of several of the EFI runtime functions, needed to
 338          * set the firmware into virtual mode.
 339          */
 340         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 341                                 sizeof(efi_runtime_services_t));
 342         if (runtime != NULL) {
 343                 /*
 344                  * We will only need *early* access to the following
 345                  * two EFI runtime services before set_virtual_address_map
 346                  * is invoked.
 347                  */
 348                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 349                 efi_phys.set_virtual_address_map =
 350                         (efi_set_virtual_address_map_t *)
 351                         runtime->set_virtual_address_map;
 352                 /*
 353                  * Make efi_get_time can be called before entering
 354                  * virtual mode.
 355                  */
 356                 efi.get_time = phys_efi_get_time;
 357         } else
 358                 printk(KERN_ERR "Could not map the EFI runtime service "
 359                        "table!\n");
 360         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 361
 362         /* Map the EFI memory map */
 363         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 364                                    memmap.nr_map * memmap.desc_size);
 365         if (memmap.map == NULL)
 366                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 367         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 368         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 369                 printk(KERN_WARNING "Kernel-defined memdesc"
 370                        "doesn't match the one from EFI!\n");
 371
 372 #ifdef CONFIG_X86_64
 373         /* Setup for EFI runtime service */
 374         reboot_type = BOOT_EFI;
 375
 376 #endif
 377 #if EFI_DEBUG
 378         print_efi_memmap();
 379 #endif
 380 }
 381
 382 /*
 383  * This function will switch the EFI runtime services to virtual mode.
 384  * Essentially, look through the EFI memmap and map every region that
 385  * has the runtime attribute bit set in its memory descriptor and update
 386  * that memory descriptor with the virtual address obtained from ioremap().
 387  * This enables the runtime services to be called without having to
 388  * thunk back into physical mode for every invocation.
 389  */
 390 void __init efi_enter_virtual_mode(void)
 391 {
 392         efi_memory_desc_t *md;
 393         efi_status_t status;
 394         unsigned long end;
 395         void *p;
 396
 397         efi.systab = NULL;
 398         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 399                 md = p;
 400                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 401                         continue;
 402                 if ((md->attribute & EFI_MEMORY_WB) &&
 403                     (((md->phys_addr + (md->num_pages<<EFI_PAGE_SHIFT)) >>
 404                       PAGE_SHIFT) < end_pfn_map))
 405                         md->virt_addr = (unsigned long)__va(md->phys_addr);
 406                 else
 407                         md->virt_addr = (unsigned long)
 408                                 efi_ioremap(md->phys_addr,
 409                                             md->num_pages << EFI_PAGE_SHIFT);
 410                 if (!md->virt_addr)
 411                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 412                                (unsigned long long)md->phys_addr);
 413                 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
 414                 if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
 415                     ((unsigned long)efi_phys.systab < end))
 416                         efi.systab = (efi_system_table_t *)(unsigned long)
 417                                 (md->virt_addr - md->phys_addr +
 418                                  (unsigned long)efi_phys.systab);
 419         }
 420
 421         BUG_ON(!efi.systab);
 422
 423         status = phys_efi_set_virtual_address_map(
 424                 memmap.desc_size * memmap.nr_map,
 425                 memmap.desc_size,
 426                 memmap.desc_version,
 427                 memmap.phys_map);
 428
 429         if (status != EFI_SUCCESS) {
 430                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 431                        "(status=%lx)!\n", status);
 432                 panic("EFI call to SetVirtualAddressMap() failed!");
 433         }
 434
 435         /*
 436          * Now that EFI is in virtual mode, update the function
 437          * pointers in the runtime service table to the new virtual addresses.
 438          *
 439          * Call EFI services through wrapper functions.
 440          */
 441         efi.get_time = virt_efi_get_time;
 442         efi.set_time = virt_efi_set_time;
 443         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 444         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 445         efi.get_variable = virt_efi_get_variable;
 446         efi.get_next_variable = virt_efi_get_next_variable;
 447         efi.set_variable = virt_efi_set_variable;
 448         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 449         efi.reset_system = virt_efi_reset_system;
 450         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 451 #ifdef CONFIG_X86_64
 452         runtime_code_page_mkexec();
 453 #endif
 454 }
 455
 456 /*
 457  * Convenience functions to obtain memory types and attributes
 458  */
 459 u32 efi_mem_type(unsigned long phys_addr)
 460 {
 461         efi_memory_desc_t *md;
 462         void *p;
 463
 464         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 465                 md = p;
 466                 if ((md->phys_addr <= phys_addr) &&
 467                     (phys_addr < (md->phys_addr +
 468                                   (md->num_pages << EFI_PAGE_SHIFT))))
 469                         return md->type;
 470         }
 471         return 0;
 472 }
 473
 474 u64 efi_mem_attributes(unsigned long phys_addr)
 475 {
 476         efi_memory_desc_t *md;
 477         void *p;
 478
 479         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 480                 md = p;
 481                 if ((md->phys_addr <= phys_addr) &&
 482                     (phys_addr < (md->phys_addr +
 483                                   (md->num_pages << EFI_PAGE_SHIFT))))
 484                         return md->attribute;
 485         }
 486         return 0;
 487 }