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                 add_memory_region(start, size, e820_type);
 237         }
 238         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 239 }
 240
 241 #if EFI_DEBUG
 242 static void __init print_efi_memmap(void)
 243 {
 244         efi_memory_desc_t *md;
 245         void *p;
 246         int i;
 247
 248         for (p = memmap.map, i = 0;
 249              p < memmap.map_end;
 250              p += memmap.desc_size, i++) {
 251                 md = p;
 252                 printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
 253                         "range=[0x%016llx-0x%016llx) (%lluMB)\n",
 254                         i, md->type, md->attribute, md->phys_addr,
 255                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
 256                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
 257         }
 258 }
 259 #endif  /*  EFI_DEBUG  */
 260
 261 void __init efi_init(void)
 262 {
 263         efi_config_table_t *config_tables;
 264         efi_runtime_services_t *runtime;
 265         efi_char16_t *c16;
 266         char vendor[100] = "unknown";
 267         int i = 0;
 268         void *tmp;
 269
 270 #ifdef CONFIG_X86_32
 271         efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
 272         memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
 273 #else
 274         efi_phys.systab = (efi_system_table_t *)
 275                 (boot_params.efi_info.efi_systab |
 276                  ((__u64)boot_params.efi_info.efi_systab_hi<<32));
 277         memmap.phys_map = (void *)
 278                 (boot_params.efi_info.efi_memmap |
 279                  ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
 280 #endif
 281         memmap.nr_map = boot_params.efi_info.efi_memmap_size /
 282                 boot_params.efi_info.efi_memdesc_size;
 283         memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
 284         memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
 285
 286         efi.systab = early_ioremap((unsigned long)efi_phys.systab,
 287                                    sizeof(efi_system_table_t));
 288         if (efi.systab == NULL)
 289                 printk(KERN_ERR "Couldn't map the EFI system table!\n");
 290         memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
 291         early_iounmap(efi.systab, sizeof(efi_system_table_t));
 292         efi.systab = &efi_systab;
 293
 294         /*
 295          * Verify the EFI Table
 296          */
 297         if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 298                 printk(KERN_ERR "EFI system table signature incorrect!\n");
 299         if ((efi.systab->hdr.revision >> 16) == 0)
 300                 printk(KERN_ERR "Warning: EFI system table version "
 301                        "%d.%02d, expected 1.00 or greater!\n",
 302                        efi.systab->hdr.revision >> 16,
 303                        efi.systab->hdr.revision & 0xffff);
 304
 305         /*
 306          * Show what we know for posterity
 307          */
 308         c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
 309         if (c16) {
 310                 for (i = 0; i < sizeof(vendor) && *c16; ++i)
 311                         vendor[i] = *c16++;
 312                 vendor[i] = '\0';
 313         } else
 314                 printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
 315         early_iounmap(tmp, 2);
 316
 317         printk(KERN_INFO "EFI v%u.%.02u by %s \n",
 318                efi.systab->hdr.revision >> 16,
 319                efi.systab->hdr.revision & 0xffff, vendor);
 320
 321         /*
 322          * Let's see what config tables the firmware passed to us.
 323          */
 324         config_tables = early_ioremap(
 325                 efi.systab->tables,
 326                 efi.systab->nr_tables * sizeof(efi_config_table_t));
 327         if (config_tables == NULL)
 328                 printk(KERN_ERR "Could not map EFI Configuration Table!\n");
 329
 330         printk(KERN_INFO);
 331         for (i = 0; i < efi.systab->nr_tables; i++) {
 332                 if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
 333                         efi.mps = config_tables[i].table;
 334                         printk(" MPS=0x%lx ", config_tables[i].table);
 335                 } else if (!efi_guidcmp(config_tables[i].guid,
 336                                         ACPI_20_TABLE_GUID)) {
 337                         efi.acpi20 = config_tables[i].table;
 338                         printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
 339                 } else if (!efi_guidcmp(config_tables[i].guid,
 340                                         ACPI_TABLE_GUID)) {
 341                         efi.acpi = config_tables[i].table;
 342                         printk(" ACPI=0x%lx ", config_tables[i].table);
 343                 } else if (!efi_guidcmp(config_tables[i].guid,
 344                                         SMBIOS_TABLE_GUID)) {
 345                         efi.smbios = config_tables[i].table;
 346                         printk(" SMBIOS=0x%lx ", config_tables[i].table);
 347                 } else if (!efi_guidcmp(config_tables[i].guid,
 348                                         HCDP_TABLE_GUID)) {
 349                         efi.hcdp = config_tables[i].table;
 350                         printk(" HCDP=0x%lx ", config_tables[i].table);
 351                 } else if (!efi_guidcmp(config_tables[i].guid,
 352                                         UGA_IO_PROTOCOL_GUID)) {
 353                         efi.uga = config_tables[i].table;
 354                         printk(" UGA=0x%lx ", config_tables[i].table);
 355                 }
 356         }
 357         printk("\n");
 358         early_iounmap(config_tables,
 359                           efi.systab->nr_tables * sizeof(efi_config_table_t));
 360
 361         /*
 362          * Check out the runtime services table. We need to map
 363          * the runtime services table so that we can grab the physical
 364          * address of several of the EFI runtime functions, needed to
 365          * set the firmware into virtual mode.
 366          */
 367         runtime = early_ioremap((unsigned long)efi.systab->runtime,
 368                                 sizeof(efi_runtime_services_t));
 369         if (runtime != NULL) {
 370                 /*
 371                  * We will only need *early* access to the following
 372                  * two EFI runtime services before set_virtual_address_map
 373                  * is invoked.
 374                  */
 375                 efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
 376                 efi_phys.set_virtual_address_map =
 377                         (efi_set_virtual_address_map_t *)
 378                         runtime->set_virtual_address_map;
 379                 /*
 380                  * Make efi_get_time can be called before entering
 381                  * virtual mode.
 382                  */
 383                 efi.get_time = phys_efi_get_time;
 384         } else
 385                 printk(KERN_ERR "Could not map the EFI runtime service "
 386                        "table!\n");
 387         early_iounmap(runtime, sizeof(efi_runtime_services_t));
 388
 389         /* Map the EFI memory map */
 390         memmap.map = early_ioremap((unsigned long)memmap.phys_map,
 391                                    memmap.nr_map * memmap.desc_size);
 392         if (memmap.map == NULL)
 393                 printk(KERN_ERR "Could not map the EFI memory map!\n");
 394         memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
 395         if (memmap.desc_size != sizeof(efi_memory_desc_t))
 396                 printk(KERN_WARNING "Kernel-defined memdesc"
 397                        "doesn't match the one from EFI!\n");
 398         add_efi_memmap();
 399
 400         /* Setup for EFI runtime service */
 401         reboot_type = BOOT_EFI;
 402
 403 #if EFI_DEBUG
 404         print_efi_memmap();
 405 #endif
 406 }
 407
 408 static void __init runtime_code_page_mkexec(void)
 409 {
 410         efi_memory_desc_t *md;
 411         void *p;
 412         u64 addr, npages;
 413
 414         /* Make EFI runtime service code area executable */
 415         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 416                 md = p;
 417
 418                 if (md->type != EFI_RUNTIME_SERVICES_CODE)
 419                         continue;
 420
 421                 addr = md->virt_addr;
 422                 npages = md->num_pages;
 423                 memrange_efi_to_native(&addr, &npages);
 424                 set_memory_x(addr, npages);
 425         }
 426 }
 427
 428 /*
 429  * This function will switch the EFI runtime services to virtual mode.
 430  * Essentially, look through the EFI memmap and map every region that
 431  * has the runtime attribute bit set in its memory descriptor and update
 432  * that memory descriptor with the virtual address obtained from ioremap().
 433  * This enables the runtime services to be called without having to
 434  * thunk back into physical mode for every invocation.
 435  */
 436 void __init efi_enter_virtual_mode(void)
 437 {
 438         efi_memory_desc_t *md;
 439         efi_status_t status;
 440         unsigned long size;
 441         u64 end, systab, addr, npages;
 442         void *p, *va;
 443
 444         efi.systab = NULL;
 445         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 446                 md = p;
 447                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
 448                         continue;
 449
 450                 size = md->num_pages << EFI_PAGE_SHIFT;
 451                 end = md->phys_addr + size;
 452
 453                 if (PFN_UP(end) <= max_pfn_mapped)
 454                         va = __va(md->phys_addr);
 455                 else
 456                         va = efi_ioremap(md->phys_addr, size);
 457
 458                 md->virt_addr = (u64) (unsigned long) va;
 459
 460                 if (!va) {
 461                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
 462                                (unsigned long long)md->phys_addr);
 463                         continue;
 464                 }
 465
 466                 if (!(md->attribute & EFI_MEMORY_WB)) {
 467                         addr = md->virt_addr;
 468                         npages = md->num_pages;
 469                         memrange_efi_to_native(&addr, &npages);
 470                         set_memory_uc(addr, npages);
 471                 }
 472
 473                 systab = (u64) (unsigned long) efi_phys.systab;
 474                 if (md->phys_addr <= systab && systab < end) {
 475                         systab += md->virt_addr - md->phys_addr;
 476                         efi.systab = (efi_system_table_t *) (unsigned long) systab;
 477                 }
 478         }
 479
 480         BUG_ON(!efi.systab);
 481
 482         status = phys_efi_set_virtual_address_map(
 483                 memmap.desc_size * memmap.nr_map,
 484                 memmap.desc_size,
 485                 memmap.desc_version,
 486                 memmap.phys_map);
 487
 488         if (status != EFI_SUCCESS) {
 489                 printk(KERN_ALERT "Unable to switch EFI into virtual mode "
 490                        "(status=%lx)!\n", status);
 491                 panic("EFI call to SetVirtualAddressMap() failed!");
 492         }
 493
 494         /*
 495          * Now that EFI is in virtual mode, update the function
 496          * pointers in the runtime service table to the new virtual addresses.
 497          *
 498          * Call EFI services through wrapper functions.
 499          */
 500         efi.get_time = virt_efi_get_time;
 501         efi.set_time = virt_efi_set_time;
 502         efi.get_wakeup_time = virt_efi_get_wakeup_time;
 503         efi.set_wakeup_time = virt_efi_set_wakeup_time;
 504         efi.get_variable = virt_efi_get_variable;
 505         efi.get_next_variable = virt_efi_get_next_variable;
 506         efi.set_variable = virt_efi_set_variable;
 507         efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
 508         efi.reset_system = virt_efi_reset_system;
 509         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
 510         if (__supported_pte_mask & _PAGE_NX)
 511                 runtime_code_page_mkexec();
 512         early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
 513         memmap.map = NULL;
 514 }
 515
 516 /*
 517  * Convenience functions to obtain memory types and attributes
 518  */
 519 u32 efi_mem_type(unsigned long phys_addr)
 520 {
 521         efi_memory_desc_t *md;
 522         void *p;
 523
 524         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 525                 md = p;
 526                 if ((md->phys_addr <= phys_addr) &&
 527                     (phys_addr < (md->phys_addr +
 528                                   (md->num_pages << EFI_PAGE_SHIFT))))
 529                         return md->type;
 530         }
 531         return 0;
 532 }
 533
 534 u64 efi_mem_attributes(unsigned long phys_addr)
 535 {
 536         efi_memory_desc_t *md;
 537         void *p;
 538
 539         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
 540                 md = p;
 541                 if ((md->phys_addr <= phys_addr) &&
 542                     (phys_addr < (md->phys_addr +
 543                                   (md->num_pages << EFI_PAGE_SHIFT))))
 544                         return md->attribute;
 545         }
 546         return 0;
 547 }