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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31 #include <linux/kernel.h> 32 #include <linux/init.h> 33 #include <linux/efi.h> 34 #include <linux/efi-bgrt.h> 35 #include <linux/export.h> 36 #include <linux/bootmem.h> 37 #include <linux/slab.h> 38 #include <linux/memblock.h> 39 #include <linux/spinlock.h> 40 #include <linux/uaccess.h> 41 #include <linux/time.h> 42 #include <linux/io.h> 43 #include <linux/reboot.h> 44 #include <linux/bcd.h> 45 #include <linux/ucs2_string.h> 46 47 #include <asm/setup.h> 48 #include <asm/efi.h> 49 #include <asm/time.h> 50 #include <asm/cacheflush.h> 51 #include <asm/tlbflush.h> 52 #include <asm/x86_init.h> 53 #include <asm/rtc.h> 54 55 #define EFI_DEBUG 1 56 57 /* 58 * There's some additional metadata associated with each 59 * variable. Intel's reference implementation is 60 bytes - bump that 60 * to account for potential alignment constraints 61 */ 62 #define VAR_METADATA_SIZE 64 63 64 struct efi __read_mostly efi = { 65 .mps = EFI_INVALID_TABLE_ADDR, 66 .acpi = EFI_INVALID_TABLE_ADDR, 67 .acpi20 = EFI_INVALID_TABLE_ADDR, 68 .smbios = EFI_INVALID_TABLE_ADDR, 69 .sal_systab = EFI_INVALID_TABLE_ADDR, 70 .boot_info = EFI_INVALID_TABLE_ADDR, 71 .hcdp = EFI_INVALID_TABLE_ADDR, 72 .uga = EFI_INVALID_TABLE_ADDR, 73 .uv_systab = EFI_INVALID_TABLE_ADDR, 74 }; 75 EXPORT_SYMBOL(efi); 76 77 struct efi_memory_map memmap; 78 79 static struct efi efi_phys __initdata; 80 static efi_system_table_t efi_systab __initdata; 81 82 static u64 efi_var_store_size; 83 static u64 efi_var_remaining_size; 84 static u64 efi_var_max_var_size; 85 static u64 boot_used_size; 86 static u64 boot_var_size; 87 static u64 active_size; 88 89 unsigned long x86_efi_facility; 90 91 /* 92 * Returns 1 if 'facility' is enabled, 0 otherwise. 93 */ 94 int efi_enabled(int facility) 95 { 96 return test_bit(facility, &x86_efi_facility) != 0; 97 } 98 EXPORT_SYMBOL(efi_enabled); 99 100 static bool __initdata disable_runtime = false; 101 static int __init setup_noefi(char *arg) 102 { 103 disable_runtime = true; 104 return 0; 105 } 106 early_param("noefi", setup_noefi); 107 108 int add_efi_memmap; 109 EXPORT_SYMBOL(add_efi_memmap); 110 111 static int __init setup_add_efi_memmap(char *arg) 112 { 113 add_efi_memmap = 1; 114 return 0; 115 } 116 early_param("add_efi_memmap", setup_add_efi_memmap); 117 118 static bool efi_no_storage_paranoia; 119 120 static int __init setup_storage_paranoia(char *arg) 121 { 122 efi_no_storage_paranoia = true; 123 return 0; 124 } 125 early_param("efi_no_storage_paranoia", setup_storage_paranoia); 126 127 128 static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) 129 { 130 unsigned long flags; 131 efi_status_t status; 132 133 spin_lock_irqsave(&rtc_lock, flags); 134 status = efi_call_virt2(get_time, tm, tc); 135 spin_unlock_irqrestore(&rtc_lock, flags); 136 return status; 137 } 138 139 static efi_status_t virt_efi_set_time(efi_time_t *tm) 140 { 141 unsigned long flags; 142 efi_status_t status; 143 144 spin_lock_irqsave(&rtc_lock, flags); 145 status = efi_call_virt1(set_time, tm); 146 spin_unlock_irqrestore(&rtc_lock, flags); 147 return status; 148 } 149 150 static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, 151 efi_bool_t *pending, 152 efi_time_t *tm) 153 { 154 unsigned long flags; 155 efi_status_t status; 156 157 spin_lock_irqsave(&rtc_lock, flags); 158 status = efi_call_virt3(get_wakeup_time, 159 enabled, pending, tm); 160 spin_unlock_irqrestore(&rtc_lock, flags); 161 return status; 162 } 163 164 static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) 165 { 166 unsigned long flags; 167 efi_status_t status; 168 169 spin_lock_irqsave(&rtc_lock, flags); 170 status = efi_call_virt2(set_wakeup_time, 171 enabled, tm); 172 spin_unlock_irqrestore(&rtc_lock, flags); 173 return status; 174 } 175 176 static efi_status_t virt_efi_get_variable(efi_char16_t *name, 177 efi_guid_t *vendor, 178 u32 *attr, 179 unsigned long *data_size, 180 void *data) 181 { 182 return efi_call_virt5(get_variable, 183 name, vendor, attr, 184 data_size, data); 185 } 186 187 static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, 188 efi_char16_t *name, 189 efi_guid_t *vendor) 190 { 191 efi_status_t status; 192 static bool finished = false; 193 static u64 var_size; 194 195 status = efi_call_virt3(get_next_variable, 196 name_size, name, vendor); 197 198 if (status == EFI_NOT_FOUND) { 199 finished = true; 200 if (var_size < boot_used_size) { 201 boot_var_size = boot_used_size - var_size; 202 active_size += boot_var_size; 203 } else { 204 printk(KERN_WARNING FW_BUG "efi: Inconsistent initial sizes\n"); 205 } 206 } 207 208 if (boot_used_size && !finished) { 209 unsigned long size; 210 u32 attr; 211 efi_status_t s; 212 void *tmp; 213 214 s = virt_efi_get_variable(name, vendor, &attr, &size, NULL); 215 216 if (s != EFI_BUFFER_TOO_SMALL || !size) 217 return status; 218 219 tmp = kmalloc(size, GFP_ATOMIC); 220 221 if (!tmp) 222 return status; 223 224 s = virt_efi_get_variable(name, vendor, &attr, &size, tmp); 225 226 if (s == EFI_SUCCESS && (attr & EFI_VARIABLE_NON_VOLATILE)) { 227 var_size += size; 228 var_size += ucs2_strsize(name, 1024); 229 active_size += size; 230 active_size += VAR_METADATA_SIZE; 231 active_size += ucs2_strsize(name, 1024); 232 } 233 234 kfree(tmp); 235 } 236 237 return status; 238 } 239 240 static efi_status_t virt_efi_set_variable(efi_char16_t *name, 241 efi_guid_t *vendor, 242 u32 attr, 243 unsigned long data_size, 244 void *data) 245 { 246 efi_status_t status; 247 u32 orig_attr = 0; 248 unsigned long orig_size = 0; 249 250 status = virt_efi_get_variable(name, vendor, &orig_attr, &orig_size, 251 NULL); 252 253 if (status != EFI_BUFFER_TOO_SMALL) 254 orig_size = 0; 255 256 status = efi_call_virt5(set_variable, 257 name, vendor, attr, 258 data_size, data); 259 260 if (status == EFI_SUCCESS) { 261 if (orig_size) { 262 active_size -= orig_size; 263 active_size -= ucs2_strsize(name, 1024); 264 active_size -= VAR_METADATA_SIZE; 265 } 266 if (data_size) { 267 active_size += data_size; 268 active_size += ucs2_strsize(name, 1024); 269 active_size += VAR_METADATA_SIZE; 270 } 271 } 272 273 return status; 274 } 275 276 static efi_status_t virt_efi_query_variable_info(u32 attr, 277 u64 *storage_space, 278 u64 *remaining_space, 279 u64 *max_variable_size) 280 { 281 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 282 return EFI_UNSUPPORTED; 283 284 return efi_call_virt4(query_variable_info, attr, storage_space, 285 remaining_space, max_variable_size); 286 } 287 288 static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) 289 { 290 return efi_call_virt1(get_next_high_mono_count, count); 291 } 292 293 static void virt_efi_reset_system(int reset_type, 294 efi_status_t status, 295 unsigned long data_size, 296 efi_char16_t *data) 297 { 298 efi_call_virt4(reset_system, reset_type, status, 299 data_size, data); 300 } 301 302 static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, 303 unsigned long count, 304 unsigned long sg_list) 305 { 306 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 307 return EFI_UNSUPPORTED; 308 309 return efi_call_virt3(update_capsule, capsules, count, sg_list); 310 } 311 312 static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, 313 unsigned long count, 314 u64 *max_size, 315 int *reset_type) 316 { 317 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 318 return EFI_UNSUPPORTED; 319 320 return efi_call_virt4(query_capsule_caps, capsules, count, max_size, 321 reset_type); 322 } 323 324 static efi_status_t __init phys_efi_set_virtual_address_map( 325 unsigned long memory_map_size, 326 unsigned long descriptor_size, 327 u32 descriptor_version, 328 efi_memory_desc_t *virtual_map) 329 { 330 efi_status_t status; 331 332 efi_call_phys_prelog(); 333 status = efi_call_phys4(efi_phys.set_virtual_address_map, 334 memory_map_size, descriptor_size, 335 descriptor_version, virtual_map); 336 efi_call_phys_epilog(); 337 return status; 338 } 339 340 static efi_status_t __init phys_efi_get_time(efi_time_t *tm, 341 efi_time_cap_t *tc) 342 { 343 unsigned long flags; 344 efi_status_t status; 345 346 spin_lock_irqsave(&rtc_lock, flags); 347 efi_call_phys_prelog(); 348 status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm), 349 virt_to_phys(tc)); 350 efi_call_phys_epilog(); 351 spin_unlock_irqrestore(&rtc_lock, flags); 352 return status; 353 } 354 355 int efi_set_rtc_mmss(unsigned long nowtime) 356 { 357 efi_status_t status; 358 efi_time_t eft; 359 efi_time_cap_t cap; 360 struct rtc_time tm; 361 362 status = efi.get_time(&eft, &cap); 363 if (status != EFI_SUCCESS) { 364 pr_err("Oops: efitime: can't read time!\n"); 365 return -1; 366 } 367 368 rtc_time_to_tm(nowtime, &tm); 369 if (!rtc_valid_tm(&tm)) { 370 eft.year = tm.tm_year + 1900; 371 eft.month = tm.tm_mon + 1; 372 eft.day = tm.tm_mday; 373 eft.minute = tm.tm_min; 374 eft.second = tm.tm_sec; 375 eft.nanosecond = 0; 376 } else { 377 printk(KERN_ERR 378 "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n", 379 __FUNCTION__, nowtime); 380 return -1; 381 } 382 383 status = efi.set_time(&eft); 384 if (status != EFI_SUCCESS) { 385 pr_err("Oops: efitime: can't write time!\n"); 386 return -1; 387 } 388 return 0; 389 } 390 391 unsigned long efi_get_time(void) 392 { 393 efi_status_t status; 394 efi_time_t eft; 395 efi_time_cap_t cap; 396 397 status = efi.get_time(&eft, &cap); 398 if (status != EFI_SUCCESS) 399 pr_err("Oops: efitime: can't read time!\n"); 400 401 return mktime(eft.year, eft.month, eft.day, eft.hour, 402 eft.minute, eft.second); 403 } 404 405 /* 406 * Tell the kernel about the EFI memory map. This might include 407 * more than the max 128 entries that can fit in the e820 legacy 408 * (zeropage) memory map. 409 */ 410 411 static void __init do_add_efi_memmap(void) 412 { 413 void *p; 414 415 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 416 efi_memory_desc_t *md = p; 417 unsigned long long start = md->phys_addr; 418 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; 419 int e820_type; 420 421 switch (md->type) { 422 case EFI_LOADER_CODE: 423 case EFI_LOADER_DATA: 424 case EFI_BOOT_SERVICES_CODE: 425 case EFI_BOOT_SERVICES_DATA: 426 case EFI_CONVENTIONAL_MEMORY: 427 if (md->attribute & EFI_MEMORY_WB) 428 e820_type = E820_RAM; 429 else 430 e820_type = E820_RESERVED; 431 break; 432 case EFI_ACPI_RECLAIM_MEMORY: 433 e820_type = E820_ACPI; 434 break; 435 case EFI_ACPI_MEMORY_NVS: 436 e820_type = E820_NVS; 437 break; 438 case EFI_UNUSABLE_MEMORY: 439 e820_type = E820_UNUSABLE; 440 break; 441 default: 442 /* 443 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE 444 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO 445 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE 446 */ 447 e820_type = E820_RESERVED; 448 break; 449 } 450 e820_add_region(start, size, e820_type); 451 } 452 sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); 453 } 454 455 int __init efi_memblock_x86_reserve_range(void) 456 { 457 struct efi_info *e = &boot_params.efi_info; 458 unsigned long pmap; 459 460 #ifdef CONFIG_X86_32 461 /* Can't handle data above 4GB at this time */ 462 if (e->efi_memmap_hi) { 463 pr_err("Memory map is above 4GB, disabling EFI.\n"); 464 return -EINVAL; 465 } 466 pmap = e->efi_memmap; 467 #else 468 pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); 469 #endif 470 memmap.phys_map = (void *)pmap; 471 memmap.nr_map = e->efi_memmap_size / 472 e->efi_memdesc_size; 473 memmap.desc_size = e->efi_memdesc_size; 474 memmap.desc_version = e->efi_memdesc_version; 475 476 memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); 477 478 return 0; 479 } 480 481 #if EFI_DEBUG 482 static void __init print_efi_memmap(void) 483 { 484 efi_memory_desc_t *md; 485 void *p; 486 int i; 487 488 for (p = memmap.map, i = 0; 489 p < memmap.map_end; 490 p += memmap.desc_size, i++) { 491 md = p; 492 pr_info("mem%02u: type=%u, attr=0x%llx, " 493 "range=[0x%016llx-0x%016llx) (%lluMB)\n", 494 i, md->type, md->attribute, md->phys_addr, 495 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), 496 (md->num_pages >> (20 - EFI_PAGE_SHIFT))); 497 } 498 } 499 #endif /* EFI_DEBUG */ 500 501 void __init efi_reserve_boot_services(void) 502 { 503 void *p; 504 505 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 506 efi_memory_desc_t *md = p; 507 u64 start = md->phys_addr; 508 u64 size = md->num_pages << EFI_PAGE_SHIFT; 509 510 if (md->type != EFI_BOOT_SERVICES_CODE && 511 md->type != EFI_BOOT_SERVICES_DATA) 512 continue; 513 /* Only reserve where possible: 514 * - Not within any already allocated areas 515 * - Not over any memory area (really needed, if above?) 516 * - Not within any part of the kernel 517 * - Not the bios reserved area 518 */ 519 if ((start+size >= __pa_symbol(_text) 520 && start <= __pa_symbol(_end)) || 521 !e820_all_mapped(start, start+size, E820_RAM) || 522 memblock_is_region_reserved(start, size)) { 523 /* Could not reserve, skip it */ 524 md->num_pages = 0; 525 memblock_dbg("Could not reserve boot range " 526 "[0x%010llx-0x%010llx]\n", 527 start, start+size-1); 528 } else 529 memblock_reserve(start, size); 530 } 531 } 532 533 void __init efi_unmap_memmap(void) 534 { 535 clear_bit(EFI_MEMMAP, &x86_efi_facility); 536 if (memmap.map) { 537 early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size); 538 memmap.map = NULL; 539 } 540 } 541 542 void __init efi_free_boot_services(void) 543 { 544 void *p; 545 546 if (!efi_is_native()) 547 return; 548 549 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 550 efi_memory_desc_t *md = p; 551 unsigned long long start = md->phys_addr; 552 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; 553 554 if (md->type != EFI_BOOT_SERVICES_CODE && 555 md->type != EFI_BOOT_SERVICES_DATA) 556 continue; 557 558 /* Could not reserve boot area */ 559 if (!size) 560 continue; 561 562 free_bootmem_late(start, size); 563 } 564 565 efi_unmap_memmap(); 566 } 567 568 static int __init efi_systab_init(void *phys) 569 { 570 if (efi_enabled(EFI_64BIT)) { 571 efi_system_table_64_t *systab64; 572 u64 tmp = 0; 573 574 systab64 = early_ioremap((unsigned long)phys, 575 sizeof(*systab64)); 576 if (systab64 == NULL) { 577 pr_err("Couldn't map the system table!\n"); 578 return -ENOMEM; 579 } 580 581 efi_systab.hdr = systab64->hdr; 582 efi_systab.fw_vendor = systab64->fw_vendor; 583 tmp |= systab64->fw_vendor; 584 efi_systab.fw_revision = systab64->fw_revision; 585 efi_systab.con_in_handle = systab64->con_in_handle; 586 tmp |= systab64->con_in_handle; 587 efi_systab.con_in = systab64->con_in; 588 tmp |= systab64->con_in; 589 efi_systab.con_out_handle = systab64->con_out_handle; 590 tmp |= systab64->con_out_handle; 591 efi_systab.con_out = systab64->con_out; 592 tmp |= systab64->con_out; 593 efi_systab.stderr_handle = systab64->stderr_handle; 594 tmp |= systab64->stderr_handle; 595 efi_systab.stderr = systab64->stderr; 596 tmp |= systab64->stderr; 597 efi_systab.runtime = (void *)(unsigned long)systab64->runtime; 598 tmp |= systab64->runtime; 599 efi_systab.boottime = (void *)(unsigned long)systab64->boottime; 600 tmp |= systab64->boottime; 601 efi_systab.nr_tables = systab64->nr_tables; 602 efi_systab.tables = systab64->tables; 603 tmp |= systab64->tables; 604 605 early_iounmap(systab64, sizeof(*systab64)); 606 #ifdef CONFIG_X86_32 607 if (tmp >> 32) { 608 pr_err("EFI data located above 4GB, disabling EFI.\n"); 609 return -EINVAL; 610 } 611 #endif 612 } else { 613 efi_system_table_32_t *systab32; 614 615 systab32 = early_ioremap((unsigned long)phys, 616 sizeof(*systab32)); 617 if (systab32 == NULL) { 618 pr_err("Couldn't map the system table!\n"); 619 return -ENOMEM; 620 } 621 622 efi_systab.hdr = systab32->hdr; 623 efi_systab.fw_vendor = systab32->fw_vendor; 624 efi_systab.fw_revision = systab32->fw_revision; 625 efi_systab.con_in_handle = systab32->con_in_handle; 626 efi_systab.con_in = systab32->con_in; 627 efi_systab.con_out_handle = systab32->con_out_handle; 628 efi_systab.con_out = systab32->con_out; 629 efi_systab.stderr_handle = systab32->stderr_handle; 630 efi_systab.stderr = systab32->stderr; 631 efi_systab.runtime = (void *)(unsigned long)systab32->runtime; 632 efi_systab.boottime = (void *)(unsigned long)systab32->boottime; 633 efi_systab.nr_tables = systab32->nr_tables; 634 efi_systab.tables = systab32->tables; 635 636 early_iounmap(systab32, sizeof(*systab32)); 637 } 638 639 efi.systab = &efi_systab; 640 641 /* 642 * Verify the EFI Table 643 */ 644 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { 645 pr_err("System table signature incorrect!\n"); 646 return -EINVAL; 647 } 648 if ((efi.systab->hdr.revision >> 16) == 0) 649 pr_err("Warning: System table version " 650 "%d.%02d, expected 1.00 or greater!\n", 651 efi.systab->hdr.revision >> 16, 652 efi.systab->hdr.revision & 0xffff); 653 654 return 0; 655 } 656 657 static int __init efi_config_init(u64 tables, int nr_tables) 658 { 659 void *config_tables, *tablep; 660 int i, sz; 661 662 if (efi_enabled(EFI_64BIT)) 663 sz = sizeof(efi_config_table_64_t); 664 else 665 sz = sizeof(efi_config_table_32_t); 666 667 /* 668 * Let's see what config tables the firmware passed to us. 669 */ 670 config_tables = early_ioremap(tables, nr_tables * sz); 671 if (config_tables == NULL) { 672 pr_err("Could not map Configuration table!\n"); 673 return -ENOMEM; 674 } 675 676 tablep = config_tables; 677 pr_info(""); 678 for (i = 0; i < efi.systab->nr_tables; i++) { 679 efi_guid_t guid; 680 unsigned long table; 681 682 if (efi_enabled(EFI_64BIT)) { 683 u64 table64; 684 guid = ((efi_config_table_64_t *)tablep)->guid; 685 table64 = ((efi_config_table_64_t *)tablep)->table; 686 table = table64; 687 #ifdef CONFIG_X86_32 688 if (table64 >> 32) { 689 pr_cont("\n"); 690 pr_err("Table located above 4GB, disabling EFI.\n"); 691 early_iounmap(config_tables, 692 efi.systab->nr_tables * sz); 693 return -EINVAL; 694 } 695 #endif 696 } else { 697 guid = ((efi_config_table_32_t *)tablep)->guid; 698 table = ((efi_config_table_32_t *)tablep)->table; 699 } 700 if (!efi_guidcmp(guid, MPS_TABLE_GUID)) { 701 efi.mps = table; 702 pr_cont(" MPS=0x%lx ", table); 703 } else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) { 704 efi.acpi20 = table; 705 pr_cont(" ACPI 2.0=0x%lx ", table); 706 } else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) { 707 efi.acpi = table; 708 pr_cont(" ACPI=0x%lx ", table); 709 } else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) { 710 efi.smbios = table; 711 pr_cont(" SMBIOS=0x%lx ", table); 712 #ifdef CONFIG_X86_UV 713 } else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) { 714 efi.uv_systab = table; 715 pr_cont(" UVsystab=0x%lx ", table); 716 #endif 717 } else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) { 718 efi.hcdp = table; 719 pr_cont(" HCDP=0x%lx ", table); 720 } else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) { 721 efi.uga = table; 722 pr_cont(" UGA=0x%lx ", table); 723 } 724 tablep += sz; 725 } 726 pr_cont("\n"); 727 early_iounmap(config_tables, efi.systab->nr_tables * sz); 728 return 0; 729 } 730 731 static int __init efi_runtime_init(void) 732 { 733 efi_runtime_services_t *runtime; 734 735 /* 736 * Check out the runtime services table. We need to map 737 * the runtime services table so that we can grab the physical 738 * address of several of the EFI runtime functions, needed to 739 * set the firmware into virtual mode. 740 */ 741 runtime = early_ioremap((unsigned long)efi.systab->runtime, 742 sizeof(efi_runtime_services_t)); 743 if (!runtime) { 744 pr_err("Could not map the runtime service table!\n"); 745 return -ENOMEM; 746 } 747 /* 748 * We will only need *early* access to the following 749 * two EFI runtime services before set_virtual_address_map 750 * is invoked. 751 */ 752 efi_phys.get_time = (efi_get_time_t *)runtime->get_time; 753 efi_phys.set_virtual_address_map = 754 (efi_set_virtual_address_map_t *) 755 runtime->set_virtual_address_map; 756 /* 757 * Make efi_get_time can be called before entering 758 * virtual mode. 759 */ 760 efi.get_time = phys_efi_get_time; 761 early_iounmap(runtime, sizeof(efi_runtime_services_t)); 762 763 return 0; 764 } 765 766 static int __init efi_memmap_init(void) 767 { 768 /* Map the EFI memory map */ 769 memmap.map = early_ioremap((unsigned long)memmap.phys_map, 770 memmap.nr_map * memmap.desc_size); 771 if (memmap.map == NULL) { 772 pr_err("Could not map the memory map!\n"); 773 return -ENOMEM; 774 } 775 memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); 776 777 if (add_efi_memmap) 778 do_add_efi_memmap(); 779 780 return 0; 781 } 782 783 void __init efi_init(void) 784 { 785 efi_char16_t *c16; 786 char vendor[100] = "unknown"; 787 int i = 0; 788 void *tmp; 789 struct setup_data *data; 790 struct efi_var_bootdata *efi_var_data; 791 u64 pa_data; 792 793 #ifdef CONFIG_X86_32 794 if (boot_params.efi_info.efi_systab_hi || 795 boot_params.efi_info.efi_memmap_hi) { 796 pr_info("Table located above 4GB, disabling EFI.\n"); 797 return; 798 } 799 efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; 800 #else 801 efi_phys.systab = (efi_system_table_t *) 802 (boot_params.efi_info.efi_systab | 803 ((__u64)boot_params.efi_info.efi_systab_hi<<32)); 804 #endif 805 806 if (efi_systab_init(efi_phys.systab)) 807 return; 808 809 pa_data = boot_params.hdr.setup_data; 810 while (pa_data) { 811 data = early_ioremap(pa_data, sizeof(*efi_var_data)); 812 if (data->type == SETUP_EFI_VARS) { 813 efi_var_data = (struct efi_var_bootdata *)data; 814 815 efi_var_store_size = efi_var_data->store_size; 816 efi_var_remaining_size = efi_var_data->remaining_size; 817 efi_var_max_var_size = efi_var_data->max_var_size; 818 } 819 pa_data = data->next; 820 early_iounmap(data, sizeof(*efi_var_data)); 821 } 822 823 boot_used_size = efi_var_store_size - efi_var_remaining_size; 824 825 set_bit(EFI_SYSTEM_TABLES, &x86_efi_facility); 826 827 /* 828 * Show what we know for posterity 829 */ 830 c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2); 831 if (c16) { 832 for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) 833 vendor[i] = *c16++; 834 vendor[i] = '\0'; 835 } else 836 pr_err("Could not map the firmware vendor!\n"); 837 early_iounmap(tmp, 2); 838 839 pr_info("EFI v%u.%.02u by %s\n", 840 efi.systab->hdr.revision >> 16, 841 efi.systab->hdr.revision & 0xffff, vendor); 842 843 if (efi_config_init(efi.systab->tables, efi.systab->nr_tables)) 844 return; 845 846 set_bit(EFI_CONFIG_TABLES, &x86_efi_facility); 847 848 /* 849 * Note: We currently don't support runtime services on an EFI 850 * that doesn't match the kernel 32/64-bit mode. 851 */ 852 853 if (!efi_is_native()) 854 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); 855 else { 856 if (disable_runtime || efi_runtime_init()) 857 return; 858 set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility); 859 } 860 861 if (efi_memmap_init()) 862 return; 863 864 set_bit(EFI_MEMMAP, &x86_efi_facility); 865 866 #ifdef CONFIG_X86_32 867 if (efi_is_native()) { 868 x86_platform.get_wallclock = efi_get_time; 869 x86_platform.set_wallclock = efi_set_rtc_mmss; 870 } 871 #endif 872 873 #if EFI_DEBUG 874 print_efi_memmap(); 875 #endif 876 } 877 878 void __init efi_late_init(void) 879 { 880 efi_bgrt_init(); 881 } 882 883 void __init efi_set_executable(efi_memory_desc_t *md, bool executable) 884 { 885 u64 addr, npages; 886 887 addr = md->virt_addr; 888 npages = md->num_pages; 889 890 memrange_efi_to_native(&addr, &npages); 891 892 if (executable) 893 set_memory_x(addr, npages); 894 else 895 set_memory_nx(addr, npages); 896 } 897 898 static void __init runtime_code_page_mkexec(void) 899 { 900 efi_memory_desc_t *md; 901 void *p; 902 903 /* Make EFI runtime service code area executable */ 904 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 905 md = p; 906 907 if (md->type != EFI_RUNTIME_SERVICES_CODE) 908 continue; 909 910 efi_set_executable(md, true); 911 } 912 } 913 914 /* 915 * We can't ioremap data in EFI boot services RAM, because we've already mapped 916 * it as RAM. So, look it up in the existing EFI memory map instead. Only 917 * callable after efi_enter_virtual_mode and before efi_free_boot_services. 918 */ 919 void __iomem *efi_lookup_mapped_addr(u64 phys_addr) 920 { 921 void *p; 922 if (WARN_ON(!memmap.map)) 923 return NULL; 924 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 925 efi_memory_desc_t *md = p; 926 u64 size = md->num_pages << EFI_PAGE_SHIFT; 927 u64 end = md->phys_addr + size; 928 if (!(md->attribute & EFI_MEMORY_RUNTIME) && 929 md->type != EFI_BOOT_SERVICES_CODE && 930 md->type != EFI_BOOT_SERVICES_DATA) 931 continue; 932 if (!md->virt_addr) 933 continue; 934 if (phys_addr >= md->phys_addr && phys_addr < end) { 935 phys_addr += md->virt_addr - md->phys_addr; 936 return (__force void __iomem *)(unsigned long)phys_addr; 937 } 938 } 939 return NULL; 940 } 941 942 void efi_memory_uc(u64 addr, unsigned long size) 943 { 944 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; 945 u64 npages; 946 947 npages = round_up(size, page_shift) / page_shift; 948 memrange_efi_to_native(&addr, &npages); 949 set_memory_uc(addr, npages); 950 } 951 952 /* 953 * This function will switch the EFI runtime services to virtual mode. 954 * Essentially, look through the EFI memmap and map every region that 955 * has the runtime attribute bit set in its memory descriptor and update 956 * that memory descriptor with the virtual address obtained from ioremap(). 957 * This enables the runtime services to be called without having to 958 * thunk back into physical mode for every invocation. 959 */ 960 void __init efi_enter_virtual_mode(void) 961 { 962 efi_memory_desc_t *md, *prev_md = NULL; 963 efi_status_t status; 964 unsigned long size; 965 u64 end, systab, start_pfn, end_pfn; 966 void *p, *va, *new_memmap = NULL; 967 int count = 0; 968 969 efi.systab = NULL; 970 971 /* 972 * We don't do virtual mode, since we don't do runtime services, on 973 * non-native EFI 974 */ 975 976 if (!efi_is_native()) { 977 efi_unmap_memmap(); 978 return; 979 } 980 981 /* Merge contiguous regions of the same type and attribute */ 982 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 983 u64 prev_size; 984 md = p; 985 986 if (!prev_md) { 987 prev_md = md; 988 continue; 989 } 990 991 if (prev_md->type != md->type || 992 prev_md->attribute != md->attribute) { 993 prev_md = md; 994 continue; 995 } 996 997 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; 998 999 if (md->phys_addr == (prev_md->phys_addr + prev_size)) { 1000 prev_md->num_pages += md->num_pages; 1001 md->type = EFI_RESERVED_TYPE; 1002 md->attribute = 0; 1003 continue; 1004 } 1005 prev_md = md; 1006 } 1007 1008 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 1009 md = p; 1010 if (!(md->attribute & EFI_MEMORY_RUNTIME) && 1011 md->type != EFI_BOOT_SERVICES_CODE && 1012 md->type != EFI_BOOT_SERVICES_DATA) 1013 continue; 1014 1015 size = md->num_pages << EFI_PAGE_SHIFT; 1016 end = md->phys_addr + size; 1017 1018 start_pfn = PFN_DOWN(md->phys_addr); 1019 end_pfn = PFN_UP(end); 1020 if (pfn_range_is_mapped(start_pfn, end_pfn)) { 1021 va = __va(md->phys_addr); 1022 1023 if (!(md->attribute & EFI_MEMORY_WB)) 1024 efi_memory_uc((u64)(unsigned long)va, size); 1025 } else 1026 va = efi_ioremap(md->phys_addr, size, 1027 md->type, md->attribute); 1028 1029 md->virt_addr = (u64) (unsigned long) va; 1030 1031 if (!va) { 1032 pr_err("ioremap of 0x%llX failed!\n", 1033 (unsigned long long)md->phys_addr); 1034 continue; 1035 } 1036 1037 systab = (u64) (unsigned long) efi_phys.systab; 1038 if (md->phys_addr <= systab && systab < end) { 1039 systab += md->virt_addr - md->phys_addr; 1040 efi.systab = (efi_system_table_t *) (unsigned long) systab; 1041 } 1042 new_memmap = krealloc(new_memmap, 1043 (count + 1) * memmap.desc_size, 1044 GFP_KERNEL); 1045 memcpy(new_memmap + (count * memmap.desc_size), md, 1046 memmap.desc_size); 1047 count++; 1048 } 1049 1050 BUG_ON(!efi.systab); 1051 1052 status = phys_efi_set_virtual_address_map( 1053 memmap.desc_size * count, 1054 memmap.desc_size, 1055 memmap.desc_version, 1056 (efi_memory_desc_t *)__pa(new_memmap)); 1057 1058 if (status != EFI_SUCCESS) { 1059 pr_alert("Unable to switch EFI into virtual mode " 1060 "(status=%lx)!\n", status); 1061 panic("EFI call to SetVirtualAddressMap() failed!"); 1062 } 1063 1064 /* 1065 * Now that EFI is in virtual mode, update the function 1066 * pointers in the runtime service table to the new virtual addresses. 1067 * 1068 * Call EFI services through wrapper functions. 1069 */ 1070 efi.runtime_version = efi_systab.hdr.revision; 1071 efi.get_time = virt_efi_get_time; 1072 efi.set_time = virt_efi_set_time; 1073 efi.get_wakeup_time = virt_efi_get_wakeup_time; 1074 efi.set_wakeup_time = virt_efi_set_wakeup_time; 1075 efi.get_variable = virt_efi_get_variable; 1076 efi.get_next_variable = virt_efi_get_next_variable; 1077 efi.set_variable = virt_efi_set_variable; 1078 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; 1079 efi.reset_system = virt_efi_reset_system; 1080 efi.set_virtual_address_map = NULL; 1081 efi.query_variable_info = virt_efi_query_variable_info; 1082 efi.update_capsule = virt_efi_update_capsule; 1083 efi.query_capsule_caps = virt_efi_query_capsule_caps; 1084 if (__supported_pte_mask & _PAGE_NX) 1085 runtime_code_page_mkexec(); 1086 1087 kfree(new_memmap); 1088 } 1089 1090 /* 1091 * Convenience functions to obtain memory types and attributes 1092 */ 1093 u32 efi_mem_type(unsigned long phys_addr) 1094 { 1095 efi_memory_desc_t *md; 1096 void *p; 1097 1098 if (!efi_enabled(EFI_MEMMAP)) 1099 return 0; 1100 1101 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 1102 md = p; 1103 if ((md->phys_addr <= phys_addr) && 1104 (phys_addr < (md->phys_addr + 1105 (md->num_pages << EFI_PAGE_SHIFT)))) 1106 return md->type; 1107 } 1108 return 0; 1109 } 1110 1111 u64 efi_mem_attributes(unsigned long phys_addr) 1112 { 1113 efi_memory_desc_t *md; 1114 void *p; 1115 1116 for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { 1117 md = p; 1118 if ((md->phys_addr <= phys_addr) && 1119 (phys_addr < (md->phys_addr + 1120 (md->num_pages << EFI_PAGE_SHIFT)))) 1121 return md->attribute; 1122 } 1123 return 0; 1124 } 1125 1126 /* 1127 * Some firmware has serious problems when using more than 50% of the EFI 1128 * variable store, i.e. it triggers bugs that can brick machines. Ensure that 1129 * we never use more than this safe limit. 1130 * 1131 * Return EFI_SUCCESS if it is safe to write 'size' bytes to the variable 1132 * store. 1133 */ 1134 efi_status_t efi_query_variable_store(u32 attributes, unsigned long size) 1135 { 1136 efi_status_t status; 1137 u64 storage_size, remaining_size, max_size; 1138 1139 status = efi.query_variable_info(attributes, &storage_size, 1140 &remaining_size, &max_size); 1141 if (status != EFI_SUCCESS) 1142 return status; 1143 1144 if (!max_size && remaining_size > size) 1145 printk_once(KERN_ERR FW_BUG "Broken EFI implementation" 1146 " is returning MaxVariableSize=0\n"); 1147 /* 1148 * Some firmware implementations refuse to boot if there's insufficient 1149 * space in the variable store. We account for that by refusing the 1150 * write if permitting it would reduce the available space to under 1151 * 50%. However, some firmware won't reclaim variable space until 1152 * after the used (not merely the actively used) space drops below 1153 * a threshold. We can approximate that case with the value calculated 1154 * above. If both the firmware and our calculations indicate that the 1155 * available space would drop below 50%, refuse the write. 1156 */ 1157 1158 if (!storage_size || size > remaining_size || 1159 (max_size && size > max_size)) 1160 return EFI_OUT_OF_RESOURCES; 1161 1162 if (!efi_no_storage_paranoia && 1163 ((active_size + size + VAR_METADATA_SIZE > storage_size / 2) && 1164 (remaining_size - size < storage_size / 2))) 1165 return EFI_OUT_OF_RESOURCES; 1166 1167 return EFI_SUCCESS; 1168 } 1169 EXPORT_SYMBOL_GPL(efi_query_variable_store); 1170