1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Extensible Firmware Interface 4 * 5 * Based on Extensible Firmware Interface Specification version 0.9 6 * April 30, 1999 7 * 8 * Copyright (C) 1999 VA Linux Systems 9 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 10 * Copyright (C) 1999-2003 Hewlett-Packard Co. 11 * David Mosberger-Tang <davidm@hpl.hp.com> 12 * Stephane Eranian <eranian@hpl.hp.com> 13 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P. 14 * Bjorn Helgaas <bjorn.helgaas@hp.com> 15 * 16 * All EFI Runtime Services are not implemented yet as EFI only 17 * supports physical mode addressing on SoftSDV. This is to be fixed 18 * in a future version. --drummond 1999-07-20 19 * 20 * Implemented EFI runtime services and virtual mode calls. --davidm 21 * 22 * Goutham Rao: <goutham.rao@intel.com> 23 * Skip non-WB memory and ignore empty memory ranges. 24 */ 25 #include <linux/module.h> 26 #include <linux/bootmem.h> 27 #include <linux/crash_dump.h> 28 #include <linux/kernel.h> 29 #include <linux/init.h> 30 #include <linux/types.h> 31 #include <linux/slab.h> 32 #include <linux/time.h> 33 #include <linux/efi.h> 34 #include <linux/kexec.h> 35 #include <linux/mm.h> 36 37 #include <asm/io.h> 38 #include <asm/kregs.h> 39 #include <asm/meminit.h> 40 #include <asm/pgtable.h> 41 #include <asm/processor.h> 42 #include <asm/mca.h> 43 #include <asm/setup.h> 44 #include <asm/tlbflush.h> 45 46 #define EFI_DEBUG 0 47 48 static __initdata unsigned long palo_phys; 49 50 static __initdata efi_config_table_type_t arch_tables[] = { 51 {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys}, 52 {NULL_GUID, NULL, 0}, 53 }; 54 55 extern efi_status_t efi_call_phys (void *, ...); 56 57 static efi_runtime_services_t *runtime; 58 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL; 59 60 #define efi_call_virt(f, args...) (*(f))(args) 61 62 #define STUB_GET_TIME(prefix, adjust_arg) \ 63 static efi_status_t \ 64 prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \ 65 { \ 66 struct ia64_fpreg fr[6]; \ 67 efi_time_cap_t *atc = NULL; \ 68 efi_status_t ret; \ 69 \ 70 if (tc) \ 71 atc = adjust_arg(tc); \ 72 ia64_save_scratch_fpregs(fr); \ 73 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \ 74 adjust_arg(tm), atc); \ 75 ia64_load_scratch_fpregs(fr); \ 76 return ret; \ 77 } 78 79 #define STUB_SET_TIME(prefix, adjust_arg) \ 80 static efi_status_t \ 81 prefix##_set_time (efi_time_t *tm) \ 82 { \ 83 struct ia64_fpreg fr[6]; \ 84 efi_status_t ret; \ 85 \ 86 ia64_save_scratch_fpregs(fr); \ 87 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \ 88 adjust_arg(tm)); \ 89 ia64_load_scratch_fpregs(fr); \ 90 return ret; \ 91 } 92 93 #define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \ 94 static efi_status_t \ 95 prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \ 96 efi_time_t *tm) \ 97 { \ 98 struct ia64_fpreg fr[6]; \ 99 efi_status_t ret; \ 100 \ 101 ia64_save_scratch_fpregs(fr); \ 102 ret = efi_call_##prefix( \ 103 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \ 104 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \ 105 ia64_load_scratch_fpregs(fr); \ 106 return ret; \ 107 } 108 109 #define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \ 110 static efi_status_t \ 111 prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \ 112 { \ 113 struct ia64_fpreg fr[6]; \ 114 efi_time_t *atm = NULL; \ 115 efi_status_t ret; \ 116 \ 117 if (tm) \ 118 atm = adjust_arg(tm); \ 119 ia64_save_scratch_fpregs(fr); \ 120 ret = efi_call_##prefix( \ 121 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \ 122 enabled, atm); \ 123 ia64_load_scratch_fpregs(fr); \ 124 return ret; \ 125 } 126 127 #define STUB_GET_VARIABLE(prefix, adjust_arg) \ 128 static efi_status_t \ 129 prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \ 130 unsigned long *data_size, void *data) \ 131 { \ 132 struct ia64_fpreg fr[6]; \ 133 u32 *aattr = NULL; \ 134 efi_status_t ret; \ 135 \ 136 if (attr) \ 137 aattr = adjust_arg(attr); \ 138 ia64_save_scratch_fpregs(fr); \ 139 ret = efi_call_##prefix( \ 140 (efi_get_variable_t *) __va(runtime->get_variable), \ 141 adjust_arg(name), adjust_arg(vendor), aattr, \ 142 adjust_arg(data_size), adjust_arg(data)); \ 143 ia64_load_scratch_fpregs(fr); \ 144 return ret; \ 145 } 146 147 #define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \ 148 static efi_status_t \ 149 prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \ 150 efi_guid_t *vendor) \ 151 { \ 152 struct ia64_fpreg fr[6]; \ 153 efi_status_t ret; \ 154 \ 155 ia64_save_scratch_fpregs(fr); \ 156 ret = efi_call_##prefix( \ 157 (efi_get_next_variable_t *) __va(runtime->get_next_variable), \ 158 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \ 159 ia64_load_scratch_fpregs(fr); \ 160 return ret; \ 161 } 162 163 #define STUB_SET_VARIABLE(prefix, adjust_arg) \ 164 static efi_status_t \ 165 prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \ 166 u32 attr, unsigned long data_size, \ 167 void *data) \ 168 { \ 169 struct ia64_fpreg fr[6]; \ 170 efi_status_t ret; \ 171 \ 172 ia64_save_scratch_fpregs(fr); \ 173 ret = efi_call_##prefix( \ 174 (efi_set_variable_t *) __va(runtime->set_variable), \ 175 adjust_arg(name), adjust_arg(vendor), attr, data_size, \ 176 adjust_arg(data)); \ 177 ia64_load_scratch_fpregs(fr); \ 178 return ret; \ 179 } 180 181 #define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \ 182 static efi_status_t \ 183 prefix##_get_next_high_mono_count (u32 *count) \ 184 { \ 185 struct ia64_fpreg fr[6]; \ 186 efi_status_t ret; \ 187 \ 188 ia64_save_scratch_fpregs(fr); \ 189 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \ 190 __va(runtime->get_next_high_mono_count), \ 191 adjust_arg(count)); \ 192 ia64_load_scratch_fpregs(fr); \ 193 return ret; \ 194 } 195 196 #define STUB_RESET_SYSTEM(prefix, adjust_arg) \ 197 static void \ 198 prefix##_reset_system (int reset_type, efi_status_t status, \ 199 unsigned long data_size, efi_char16_t *data) \ 200 { \ 201 struct ia64_fpreg fr[6]; \ 202 efi_char16_t *adata = NULL; \ 203 \ 204 if (data) \ 205 adata = adjust_arg(data); \ 206 \ 207 ia64_save_scratch_fpregs(fr); \ 208 efi_call_##prefix( \ 209 (efi_reset_system_t *) __va(runtime->reset_system), \ 210 reset_type, status, data_size, adata); \ 211 /* should not return, but just in case... */ \ 212 ia64_load_scratch_fpregs(fr); \ 213 } 214 215 #define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg)) 216 217 STUB_GET_TIME(phys, phys_ptr) 218 STUB_SET_TIME(phys, phys_ptr) 219 STUB_GET_WAKEUP_TIME(phys, phys_ptr) 220 STUB_SET_WAKEUP_TIME(phys, phys_ptr) 221 STUB_GET_VARIABLE(phys, phys_ptr) 222 STUB_GET_NEXT_VARIABLE(phys, phys_ptr) 223 STUB_SET_VARIABLE(phys, phys_ptr) 224 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr) 225 STUB_RESET_SYSTEM(phys, phys_ptr) 226 227 #define id(arg) arg 228 229 STUB_GET_TIME(virt, id) 230 STUB_SET_TIME(virt, id) 231 STUB_GET_WAKEUP_TIME(virt, id) 232 STUB_SET_WAKEUP_TIME(virt, id) 233 STUB_GET_VARIABLE(virt, id) 234 STUB_GET_NEXT_VARIABLE(virt, id) 235 STUB_SET_VARIABLE(virt, id) 236 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id) 237 STUB_RESET_SYSTEM(virt, id) 238 239 void 240 efi_gettimeofday (struct timespec64 *ts) 241 { 242 efi_time_t tm; 243 244 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) { 245 memset(ts, 0, sizeof(*ts)); 246 return; 247 } 248 249 ts->tv_sec = mktime64(tm.year, tm.month, tm.day, 250 tm.hour, tm.minute, tm.second); 251 ts->tv_nsec = tm.nanosecond; 252 } 253 254 static int 255 is_memory_available (efi_memory_desc_t *md) 256 { 257 if (!(md->attribute & EFI_MEMORY_WB)) 258 return 0; 259 260 switch (md->type) { 261 case EFI_LOADER_CODE: 262 case EFI_LOADER_DATA: 263 case EFI_BOOT_SERVICES_CODE: 264 case EFI_BOOT_SERVICES_DATA: 265 case EFI_CONVENTIONAL_MEMORY: 266 return 1; 267 } 268 return 0; 269 } 270 271 typedef struct kern_memdesc { 272 u64 attribute; 273 u64 start; 274 u64 num_pages; 275 } kern_memdesc_t; 276 277 static kern_memdesc_t *kern_memmap; 278 279 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT) 280 281 static inline u64 282 kmd_end(kern_memdesc_t *kmd) 283 { 284 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT)); 285 } 286 287 static inline u64 288 efi_md_end(efi_memory_desc_t *md) 289 { 290 return (md->phys_addr + efi_md_size(md)); 291 } 292 293 static inline int 294 efi_wb(efi_memory_desc_t *md) 295 { 296 return (md->attribute & EFI_MEMORY_WB); 297 } 298 299 static inline int 300 efi_uc(efi_memory_desc_t *md) 301 { 302 return (md->attribute & EFI_MEMORY_UC); 303 } 304 305 static void 306 walk (efi_freemem_callback_t callback, void *arg, u64 attr) 307 { 308 kern_memdesc_t *k; 309 u64 start, end, voff; 310 311 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET; 312 for (k = kern_memmap; k->start != ~0UL; k++) { 313 if (k->attribute != attr) 314 continue; 315 start = PAGE_ALIGN(k->start); 316 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK; 317 if (start < end) 318 if ((*callback)(start + voff, end + voff, arg) < 0) 319 return; 320 } 321 } 322 323 /* 324 * Walk the EFI memory map and call CALLBACK once for each EFI memory 325 * descriptor that has memory that is available for OS use. 326 */ 327 void 328 efi_memmap_walk (efi_freemem_callback_t callback, void *arg) 329 { 330 walk(callback, arg, EFI_MEMORY_WB); 331 } 332 333 /* 334 * Walk the EFI memory map and call CALLBACK once for each EFI memory 335 * descriptor that has memory that is available for uncached allocator. 336 */ 337 void 338 efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg) 339 { 340 walk(callback, arg, EFI_MEMORY_UC); 341 } 342 343 /* 344 * Look for the PAL_CODE region reported by EFI and map it using an 345 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor 346 * Abstraction Layer chapter 11 in ADAG 347 */ 348 void * 349 efi_get_pal_addr (void) 350 { 351 void *efi_map_start, *efi_map_end, *p; 352 efi_memory_desc_t *md; 353 u64 efi_desc_size; 354 int pal_code_count = 0; 355 u64 vaddr, mask; 356 357 efi_map_start = __va(ia64_boot_param->efi_memmap); 358 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 359 efi_desc_size = ia64_boot_param->efi_memdesc_size; 360 361 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 362 md = p; 363 if (md->type != EFI_PAL_CODE) 364 continue; 365 366 if (++pal_code_count > 1) { 367 printk(KERN_ERR "Too many EFI Pal Code memory ranges, " 368 "dropped @ %llx\n", md->phys_addr); 369 continue; 370 } 371 /* 372 * The only ITLB entry in region 7 that is used is the one 373 * installed by __start(). That entry covers a 64MB range. 374 */ 375 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1); 376 vaddr = PAGE_OFFSET + md->phys_addr; 377 378 /* 379 * We must check that the PAL mapping won't overlap with the 380 * kernel mapping. 381 * 382 * PAL code is guaranteed to be aligned on a power of 2 between 383 * 4k and 256KB and that only one ITR is needed to map it. This 384 * implies that the PAL code is always aligned on its size, 385 * i.e., the closest matching page size supported by the TLB. 386 * Therefore PAL code is guaranteed never to cross a 64MB unless 387 * it is bigger than 64MB (very unlikely!). So for now the 388 * following test is enough to determine whether or not we need 389 * a dedicated ITR for the PAL code. 390 */ 391 if ((vaddr & mask) == (KERNEL_START & mask)) { 392 printk(KERN_INFO "%s: no need to install ITR for PAL code\n", 393 __func__); 394 continue; 395 } 396 397 if (efi_md_size(md) > IA64_GRANULE_SIZE) 398 panic("Whoa! PAL code size bigger than a granule!"); 399 400 #if EFI_DEBUG 401 mask = ~((1 << IA64_GRANULE_SHIFT) - 1); 402 403 printk(KERN_INFO "CPU %d: mapping PAL code " 404 "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n", 405 smp_processor_id(), md->phys_addr, 406 md->phys_addr + efi_md_size(md), 407 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE); 408 #endif 409 return __va(md->phys_addr); 410 } 411 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n", 412 __func__); 413 return NULL; 414 } 415 416 417 static u8 __init palo_checksum(u8 *buffer, u32 length) 418 { 419 u8 sum = 0; 420 u8 *end = buffer + length; 421 422 while (buffer < end) 423 sum = (u8) (sum + *(buffer++)); 424 425 return sum; 426 } 427 428 /* 429 * Parse and handle PALO table which is published at: 430 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf 431 */ 432 static void __init handle_palo(unsigned long phys_addr) 433 { 434 struct palo_table *palo = __va(phys_addr); 435 u8 checksum; 436 437 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) { 438 printk(KERN_INFO "PALO signature incorrect.\n"); 439 return; 440 } 441 442 checksum = palo_checksum((u8 *)palo, palo->length); 443 if (checksum) { 444 printk(KERN_INFO "PALO checksum incorrect.\n"); 445 return; 446 } 447 448 setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO); 449 } 450 451 void 452 efi_map_pal_code (void) 453 { 454 void *pal_vaddr = efi_get_pal_addr (); 455 u64 psr; 456 457 if (!pal_vaddr) 458 return; 459 460 /* 461 * Cannot write to CRx with PSR.ic=1 462 */ 463 psr = ia64_clear_ic(); 464 ia64_itr(0x1, IA64_TR_PALCODE, 465 GRANULEROUNDDOWN((unsigned long) pal_vaddr), 466 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)), 467 IA64_GRANULE_SHIFT); 468 ia64_set_psr(psr); /* restore psr */ 469 } 470 471 void __init 472 efi_init (void) 473 { 474 void *efi_map_start, *efi_map_end; 475 efi_char16_t *c16; 476 u64 efi_desc_size; 477 char *cp, vendor[100] = "unknown"; 478 int i; 479 480 set_bit(EFI_BOOT, &efi.flags); 481 set_bit(EFI_64BIT, &efi.flags); 482 483 /* 484 * It's too early to be able to use the standard kernel command line 485 * support... 486 */ 487 for (cp = boot_command_line; *cp; ) { 488 if (memcmp(cp, "mem=", 4) == 0) { 489 mem_limit = memparse(cp + 4, &cp); 490 } else if (memcmp(cp, "max_addr=", 9) == 0) { 491 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp)); 492 } else if (memcmp(cp, "min_addr=", 9) == 0) { 493 min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp)); 494 } else { 495 while (*cp != ' ' && *cp) 496 ++cp; 497 while (*cp == ' ') 498 ++cp; 499 } 500 } 501 if (min_addr != 0UL) 502 printk(KERN_INFO "Ignoring memory below %lluMB\n", 503 min_addr >> 20); 504 if (max_addr != ~0UL) 505 printk(KERN_INFO "Ignoring memory above %lluMB\n", 506 max_addr >> 20); 507 508 efi.systab = __va(ia64_boot_param->efi_systab); 509 510 /* 511 * Verify the EFI Table 512 */ 513 if (efi.systab == NULL) 514 panic("Whoa! Can't find EFI system table.\n"); 515 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 516 panic("Whoa! EFI system table signature incorrect\n"); 517 if ((efi.systab->hdr.revision >> 16) == 0) 518 printk(KERN_WARNING "Warning: EFI system table version " 519 "%d.%02d, expected 1.00 or greater\n", 520 efi.systab->hdr.revision >> 16, 521 efi.systab->hdr.revision & 0xffff); 522 523 /* Show what we know for posterity */ 524 c16 = __va(efi.systab->fw_vendor); 525 if (c16) { 526 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i) 527 vendor[i] = *c16++; 528 vendor[i] = '\0'; 529 } 530 531 printk(KERN_INFO "EFI v%u.%.02u by %s:", 532 efi.systab->hdr.revision >> 16, 533 efi.systab->hdr.revision & 0xffff, vendor); 534 535 palo_phys = EFI_INVALID_TABLE_ADDR; 536 537 if (efi_config_init(arch_tables) != 0) 538 return; 539 540 if (palo_phys != EFI_INVALID_TABLE_ADDR) 541 handle_palo(palo_phys); 542 543 runtime = __va(efi.systab->runtime); 544 efi.get_time = phys_get_time; 545 efi.set_time = phys_set_time; 546 efi.get_wakeup_time = phys_get_wakeup_time; 547 efi.set_wakeup_time = phys_set_wakeup_time; 548 efi.get_variable = phys_get_variable; 549 efi.get_next_variable = phys_get_next_variable; 550 efi.set_variable = phys_set_variable; 551 efi.get_next_high_mono_count = phys_get_next_high_mono_count; 552 efi.reset_system = phys_reset_system; 553 554 efi_map_start = __va(ia64_boot_param->efi_memmap); 555 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 556 efi_desc_size = ia64_boot_param->efi_memdesc_size; 557 558 #if EFI_DEBUG 559 /* print EFI memory map: */ 560 { 561 efi_memory_desc_t *md; 562 void *p; 563 564 for (i = 0, p = efi_map_start; p < efi_map_end; 565 ++i, p += efi_desc_size) 566 { 567 const char *unit; 568 unsigned long size; 569 char buf[64]; 570 571 md = p; 572 size = md->num_pages << EFI_PAGE_SHIFT; 573 574 if ((size >> 40) > 0) { 575 size >>= 40; 576 unit = "TB"; 577 } else if ((size >> 30) > 0) { 578 size >>= 30; 579 unit = "GB"; 580 } else if ((size >> 20) > 0) { 581 size >>= 20; 582 unit = "MB"; 583 } else { 584 size >>= 10; 585 unit = "KB"; 586 } 587 588 printk("mem%02d: %s " 589 "range=[0x%016lx-0x%016lx) (%4lu%s)\n", 590 i, efi_md_typeattr_format(buf, sizeof(buf), md), 591 md->phys_addr, 592 md->phys_addr + efi_md_size(md), size, unit); 593 } 594 } 595 #endif 596 597 efi_map_pal_code(); 598 efi_enter_virtual_mode(); 599 } 600 601 void 602 efi_enter_virtual_mode (void) 603 { 604 void *efi_map_start, *efi_map_end, *p; 605 efi_memory_desc_t *md; 606 efi_status_t status; 607 u64 efi_desc_size; 608 609 efi_map_start = __va(ia64_boot_param->efi_memmap); 610 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 611 efi_desc_size = ia64_boot_param->efi_memdesc_size; 612 613 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 614 md = p; 615 if (md->attribute & EFI_MEMORY_RUNTIME) { 616 /* 617 * Some descriptors have multiple bits set, so the 618 * order of the tests is relevant. 619 */ 620 if (md->attribute & EFI_MEMORY_WB) { 621 md->virt_addr = (u64) __va(md->phys_addr); 622 } else if (md->attribute & EFI_MEMORY_UC) { 623 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 624 } else if (md->attribute & EFI_MEMORY_WC) { 625 #if 0 626 md->virt_addr = ia64_remap(md->phys_addr, 627 (_PAGE_A | 628 _PAGE_P | 629 _PAGE_D | 630 _PAGE_MA_WC | 631 _PAGE_PL_0 | 632 _PAGE_AR_RW)); 633 #else 634 printk(KERN_INFO "EFI_MEMORY_WC mapping\n"); 635 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 636 #endif 637 } else if (md->attribute & EFI_MEMORY_WT) { 638 #if 0 639 md->virt_addr = ia64_remap(md->phys_addr, 640 (_PAGE_A | 641 _PAGE_P | 642 _PAGE_D | 643 _PAGE_MA_WT | 644 _PAGE_PL_0 | 645 _PAGE_AR_RW)); 646 #else 647 printk(KERN_INFO "EFI_MEMORY_WT mapping\n"); 648 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 649 #endif 650 } 651 } 652 } 653 654 status = efi_call_phys(__va(runtime->set_virtual_address_map), 655 ia64_boot_param->efi_memmap_size, 656 efi_desc_size, 657 ia64_boot_param->efi_memdesc_version, 658 ia64_boot_param->efi_memmap); 659 if (status != EFI_SUCCESS) { 660 printk(KERN_WARNING "warning: unable to switch EFI into " 661 "virtual mode (status=%lu)\n", status); 662 return; 663 } 664 665 set_bit(EFI_RUNTIME_SERVICES, &efi.flags); 666 667 /* 668 * Now that EFI is in virtual mode, we call the EFI functions more 669 * efficiently: 670 */ 671 efi.get_time = virt_get_time; 672 efi.set_time = virt_set_time; 673 efi.get_wakeup_time = virt_get_wakeup_time; 674 efi.set_wakeup_time = virt_set_wakeup_time; 675 efi.get_variable = virt_get_variable; 676 efi.get_next_variable = virt_get_next_variable; 677 efi.set_variable = virt_set_variable; 678 efi.get_next_high_mono_count = virt_get_next_high_mono_count; 679 efi.reset_system = virt_reset_system; 680 } 681 682 /* 683 * Walk the EFI memory map looking for the I/O port range. There can only be 684 * one entry of this type, other I/O port ranges should be described via ACPI. 685 */ 686 u64 687 efi_get_iobase (void) 688 { 689 void *efi_map_start, *efi_map_end, *p; 690 efi_memory_desc_t *md; 691 u64 efi_desc_size; 692 693 efi_map_start = __va(ia64_boot_param->efi_memmap); 694 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 695 efi_desc_size = ia64_boot_param->efi_memdesc_size; 696 697 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 698 md = p; 699 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) { 700 if (md->attribute & EFI_MEMORY_UC) 701 return md->phys_addr; 702 } 703 } 704 return 0; 705 } 706 707 static struct kern_memdesc * 708 kern_memory_descriptor (unsigned long phys_addr) 709 { 710 struct kern_memdesc *md; 711 712 for (md = kern_memmap; md->start != ~0UL; md++) { 713 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT)) 714 return md; 715 } 716 return NULL; 717 } 718 719 static efi_memory_desc_t * 720 efi_memory_descriptor (unsigned long phys_addr) 721 { 722 void *efi_map_start, *efi_map_end, *p; 723 efi_memory_desc_t *md; 724 u64 efi_desc_size; 725 726 efi_map_start = __va(ia64_boot_param->efi_memmap); 727 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 728 efi_desc_size = ia64_boot_param->efi_memdesc_size; 729 730 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 731 md = p; 732 733 if (phys_addr - md->phys_addr < efi_md_size(md)) 734 return md; 735 } 736 return NULL; 737 } 738 739 static int 740 efi_memmap_intersects (unsigned long phys_addr, unsigned long size) 741 { 742 void *efi_map_start, *efi_map_end, *p; 743 efi_memory_desc_t *md; 744 u64 efi_desc_size; 745 unsigned long end; 746 747 efi_map_start = __va(ia64_boot_param->efi_memmap); 748 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 749 efi_desc_size = ia64_boot_param->efi_memdesc_size; 750 751 end = phys_addr + size; 752 753 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 754 md = p; 755 if (md->phys_addr < end && efi_md_end(md) > phys_addr) 756 return 1; 757 } 758 return 0; 759 } 760 761 int 762 efi_mem_type (unsigned long phys_addr) 763 { 764 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 765 766 if (md) 767 return md->type; 768 return -EINVAL; 769 } 770 771 u64 772 efi_mem_attributes (unsigned long phys_addr) 773 { 774 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 775 776 if (md) 777 return md->attribute; 778 return 0; 779 } 780 EXPORT_SYMBOL(efi_mem_attributes); 781 782 u64 783 efi_mem_attribute (unsigned long phys_addr, unsigned long size) 784 { 785 unsigned long end = phys_addr + size; 786 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 787 u64 attr; 788 789 if (!md) 790 return 0; 791 792 /* 793 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells 794 * the kernel that firmware needs this region mapped. 795 */ 796 attr = md->attribute & ~EFI_MEMORY_RUNTIME; 797 do { 798 unsigned long md_end = efi_md_end(md); 799 800 if (end <= md_end) 801 return attr; 802 803 md = efi_memory_descriptor(md_end); 804 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr) 805 return 0; 806 } while (md); 807 return 0; /* never reached */ 808 } 809 810 u64 811 kern_mem_attribute (unsigned long phys_addr, unsigned long size) 812 { 813 unsigned long end = phys_addr + size; 814 struct kern_memdesc *md; 815 u64 attr; 816 817 /* 818 * This is a hack for ioremap calls before we set up kern_memmap. 819 * Maybe we should do efi_memmap_init() earlier instead. 820 */ 821 if (!kern_memmap) { 822 attr = efi_mem_attribute(phys_addr, size); 823 if (attr & EFI_MEMORY_WB) 824 return EFI_MEMORY_WB; 825 return 0; 826 } 827 828 md = kern_memory_descriptor(phys_addr); 829 if (!md) 830 return 0; 831 832 attr = md->attribute; 833 do { 834 unsigned long md_end = kmd_end(md); 835 836 if (end <= md_end) 837 return attr; 838 839 md = kern_memory_descriptor(md_end); 840 if (!md || md->attribute != attr) 841 return 0; 842 } while (md); 843 return 0; /* never reached */ 844 } 845 EXPORT_SYMBOL(kern_mem_attribute); 846 847 int 848 valid_phys_addr_range (phys_addr_t phys_addr, unsigned long size) 849 { 850 u64 attr; 851 852 /* 853 * /dev/mem reads and writes use copy_to_user(), which implicitly 854 * uses a granule-sized kernel identity mapping. It's really 855 * only safe to do this for regions in kern_memmap. For more 856 * details, see Documentation/ia64/aliasing.txt. 857 */ 858 attr = kern_mem_attribute(phys_addr, size); 859 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) 860 return 1; 861 return 0; 862 } 863 864 int 865 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size) 866 { 867 unsigned long phys_addr = pfn << PAGE_SHIFT; 868 u64 attr; 869 870 attr = efi_mem_attribute(phys_addr, size); 871 872 /* 873 * /dev/mem mmap uses normal user pages, so we don't need the entire 874 * granule, but the entire region we're mapping must support the same 875 * attribute. 876 */ 877 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) 878 return 1; 879 880 /* 881 * Intel firmware doesn't tell us about all the MMIO regions, so 882 * in general we have to allow mmap requests. But if EFI *does* 883 * tell us about anything inside this region, we should deny it. 884 * The user can always map a smaller region to avoid the overlap. 885 */ 886 if (efi_memmap_intersects(phys_addr, size)) 887 return 0; 888 889 return 1; 890 } 891 892 pgprot_t 893 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, 894 pgprot_t vma_prot) 895 { 896 unsigned long phys_addr = pfn << PAGE_SHIFT; 897 u64 attr; 898 899 /* 900 * For /dev/mem mmap, we use user mappings, but if the region is 901 * in kern_memmap (and hence may be covered by a kernel mapping), 902 * we must use the same attribute as the kernel mapping. 903 */ 904 attr = kern_mem_attribute(phys_addr, size); 905 if (attr & EFI_MEMORY_WB) 906 return pgprot_cacheable(vma_prot); 907 else if (attr & EFI_MEMORY_UC) 908 return pgprot_noncached(vma_prot); 909 910 /* 911 * Some chipsets don't support UC access to memory. If 912 * WB is supported, we prefer that. 913 */ 914 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) 915 return pgprot_cacheable(vma_prot); 916 917 return pgprot_noncached(vma_prot); 918 } 919 920 int __init 921 efi_uart_console_only(void) 922 { 923 efi_status_t status; 924 char *s, name[] = "ConOut"; 925 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID; 926 efi_char16_t *utf16, name_utf16[32]; 927 unsigned char data[1024]; 928 unsigned long size = sizeof(data); 929 struct efi_generic_dev_path *hdr, *end_addr; 930 int uart = 0; 931 932 /* Convert to UTF-16 */ 933 utf16 = name_utf16; 934 s = name; 935 while (*s) 936 *utf16++ = *s++ & 0x7f; 937 *utf16 = 0; 938 939 status = efi.get_variable(name_utf16, &guid, NULL, &size, data); 940 if (status != EFI_SUCCESS) { 941 printk(KERN_ERR "No EFI %s variable?\n", name); 942 return 0; 943 } 944 945 hdr = (struct efi_generic_dev_path *) data; 946 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size); 947 while (hdr < end_addr) { 948 if (hdr->type == EFI_DEV_MSG && 949 hdr->sub_type == EFI_DEV_MSG_UART) 950 uart = 1; 951 else if (hdr->type == EFI_DEV_END_PATH || 952 hdr->type == EFI_DEV_END_PATH2) { 953 if (!uart) 954 return 0; 955 if (hdr->sub_type == EFI_DEV_END_ENTIRE) 956 return 1; 957 uart = 0; 958 } 959 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length); 960 } 961 printk(KERN_ERR "Malformed %s value\n", name); 962 return 0; 963 } 964 965 /* 966 * Look for the first granule aligned memory descriptor memory 967 * that is big enough to hold EFI memory map. Make sure this 968 * descriptor is at least granule sized so it does not get trimmed 969 */ 970 struct kern_memdesc * 971 find_memmap_space (void) 972 { 973 u64 contig_low=0, contig_high=0; 974 u64 as = 0, ae; 975 void *efi_map_start, *efi_map_end, *p, *q; 976 efi_memory_desc_t *md, *pmd = NULL, *check_md; 977 u64 space_needed, efi_desc_size; 978 unsigned long total_mem = 0; 979 980 efi_map_start = __va(ia64_boot_param->efi_memmap); 981 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 982 efi_desc_size = ia64_boot_param->efi_memdesc_size; 983 984 /* 985 * Worst case: we need 3 kernel descriptors for each efi descriptor 986 * (if every entry has a WB part in the middle, and UC head and tail), 987 * plus one for the end marker. 988 */ 989 space_needed = sizeof(kern_memdesc_t) * 990 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1); 991 992 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { 993 md = p; 994 if (!efi_wb(md)) { 995 continue; 996 } 997 if (pmd == NULL || !efi_wb(pmd) || 998 efi_md_end(pmd) != md->phys_addr) { 999 contig_low = GRANULEROUNDUP(md->phys_addr); 1000 contig_high = efi_md_end(md); 1001 for (q = p + efi_desc_size; q < efi_map_end; 1002 q += efi_desc_size) { 1003 check_md = q; 1004 if (!efi_wb(check_md)) 1005 break; 1006 if (contig_high != check_md->phys_addr) 1007 break; 1008 contig_high = efi_md_end(check_md); 1009 } 1010 contig_high = GRANULEROUNDDOWN(contig_high); 1011 } 1012 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA) 1013 continue; 1014 1015 /* Round ends inward to granule boundaries */ 1016 as = max(contig_low, md->phys_addr); 1017 ae = min(contig_high, efi_md_end(md)); 1018 1019 /* keep within max_addr= and min_addr= command line arg */ 1020 as = max(as, min_addr); 1021 ae = min(ae, max_addr); 1022 if (ae <= as) 1023 continue; 1024 1025 /* avoid going over mem= command line arg */ 1026 if (total_mem + (ae - as) > mem_limit) 1027 ae -= total_mem + (ae - as) - mem_limit; 1028 1029 if (ae <= as) 1030 continue; 1031 1032 if (ae - as > space_needed) 1033 break; 1034 } 1035 if (p >= efi_map_end) 1036 panic("Can't allocate space for kernel memory descriptors"); 1037 1038 return __va(as); 1039 } 1040 1041 /* 1042 * Walk the EFI memory map and gather all memory available for kernel 1043 * to use. We can allocate partial granules only if the unavailable 1044 * parts exist, and are WB. 1045 */ 1046 unsigned long 1047 efi_memmap_init(u64 *s, u64 *e) 1048 { 1049 struct kern_memdesc *k, *prev = NULL; 1050 u64 contig_low=0, contig_high=0; 1051 u64 as, ae, lim; 1052 void *efi_map_start, *efi_map_end, *p, *q; 1053 efi_memory_desc_t *md, *pmd = NULL, *check_md; 1054 u64 efi_desc_size; 1055 unsigned long total_mem = 0; 1056 1057 k = kern_memmap = find_memmap_space(); 1058 1059 efi_map_start = __va(ia64_boot_param->efi_memmap); 1060 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1061 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1062 1063 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { 1064 md = p; 1065 if (!efi_wb(md)) { 1066 if (efi_uc(md) && 1067 (md->type == EFI_CONVENTIONAL_MEMORY || 1068 md->type == EFI_BOOT_SERVICES_DATA)) { 1069 k->attribute = EFI_MEMORY_UC; 1070 k->start = md->phys_addr; 1071 k->num_pages = md->num_pages; 1072 k++; 1073 } 1074 continue; 1075 } 1076 if (pmd == NULL || !efi_wb(pmd) || 1077 efi_md_end(pmd) != md->phys_addr) { 1078 contig_low = GRANULEROUNDUP(md->phys_addr); 1079 contig_high = efi_md_end(md); 1080 for (q = p + efi_desc_size; q < efi_map_end; 1081 q += efi_desc_size) { 1082 check_md = q; 1083 if (!efi_wb(check_md)) 1084 break; 1085 if (contig_high != check_md->phys_addr) 1086 break; 1087 contig_high = efi_md_end(check_md); 1088 } 1089 contig_high = GRANULEROUNDDOWN(contig_high); 1090 } 1091 if (!is_memory_available(md)) 1092 continue; 1093 1094 /* 1095 * Round ends inward to granule boundaries 1096 * Give trimmings to uncached allocator 1097 */ 1098 if (md->phys_addr < contig_low) { 1099 lim = min(efi_md_end(md), contig_low); 1100 if (efi_uc(md)) { 1101 if (k > kern_memmap && 1102 (k-1)->attribute == EFI_MEMORY_UC && 1103 kmd_end(k-1) == md->phys_addr) { 1104 (k-1)->num_pages += 1105 (lim - md->phys_addr) 1106 >> EFI_PAGE_SHIFT; 1107 } else { 1108 k->attribute = EFI_MEMORY_UC; 1109 k->start = md->phys_addr; 1110 k->num_pages = (lim - md->phys_addr) 1111 >> EFI_PAGE_SHIFT; 1112 k++; 1113 } 1114 } 1115 as = contig_low; 1116 } else 1117 as = md->phys_addr; 1118 1119 if (efi_md_end(md) > contig_high) { 1120 lim = max(md->phys_addr, contig_high); 1121 if (efi_uc(md)) { 1122 if (lim == md->phys_addr && k > kern_memmap && 1123 (k-1)->attribute == EFI_MEMORY_UC && 1124 kmd_end(k-1) == md->phys_addr) { 1125 (k-1)->num_pages += md->num_pages; 1126 } else { 1127 k->attribute = EFI_MEMORY_UC; 1128 k->start = lim; 1129 k->num_pages = (efi_md_end(md) - lim) 1130 >> EFI_PAGE_SHIFT; 1131 k++; 1132 } 1133 } 1134 ae = contig_high; 1135 } else 1136 ae = efi_md_end(md); 1137 1138 /* keep within max_addr= and min_addr= command line arg */ 1139 as = max(as, min_addr); 1140 ae = min(ae, max_addr); 1141 if (ae <= as) 1142 continue; 1143 1144 /* avoid going over mem= command line arg */ 1145 if (total_mem + (ae - as) > mem_limit) 1146 ae -= total_mem + (ae - as) - mem_limit; 1147 1148 if (ae <= as) 1149 continue; 1150 if (prev && kmd_end(prev) == md->phys_addr) { 1151 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT; 1152 total_mem += ae - as; 1153 continue; 1154 } 1155 k->attribute = EFI_MEMORY_WB; 1156 k->start = as; 1157 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT; 1158 total_mem += ae - as; 1159 prev = k++; 1160 } 1161 k->start = ~0L; /* end-marker */ 1162 1163 /* reserve the memory we are using for kern_memmap */ 1164 *s = (u64)kern_memmap; 1165 *e = (u64)++k; 1166 1167 return total_mem; 1168 } 1169 1170 void 1171 efi_initialize_iomem_resources(struct resource *code_resource, 1172 struct resource *data_resource, 1173 struct resource *bss_resource) 1174 { 1175 struct resource *res; 1176 void *efi_map_start, *efi_map_end, *p; 1177 efi_memory_desc_t *md; 1178 u64 efi_desc_size; 1179 char *name; 1180 unsigned long flags, desc; 1181 1182 efi_map_start = __va(ia64_boot_param->efi_memmap); 1183 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1184 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1185 1186 res = NULL; 1187 1188 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1189 md = p; 1190 1191 if (md->num_pages == 0) /* should not happen */ 1192 continue; 1193 1194 flags = IORESOURCE_MEM | IORESOURCE_BUSY; 1195 desc = IORES_DESC_NONE; 1196 1197 switch (md->type) { 1198 1199 case EFI_MEMORY_MAPPED_IO: 1200 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 1201 continue; 1202 1203 case EFI_LOADER_CODE: 1204 case EFI_LOADER_DATA: 1205 case EFI_BOOT_SERVICES_DATA: 1206 case EFI_BOOT_SERVICES_CODE: 1207 case EFI_CONVENTIONAL_MEMORY: 1208 if (md->attribute & EFI_MEMORY_WP) { 1209 name = "System ROM"; 1210 flags |= IORESOURCE_READONLY; 1211 } else if (md->attribute == EFI_MEMORY_UC) { 1212 name = "Uncached RAM"; 1213 } else { 1214 name = "System RAM"; 1215 flags |= IORESOURCE_SYSRAM; 1216 } 1217 break; 1218 1219 case EFI_ACPI_MEMORY_NVS: 1220 name = "ACPI Non-volatile Storage"; 1221 desc = IORES_DESC_ACPI_NV_STORAGE; 1222 break; 1223 1224 case EFI_UNUSABLE_MEMORY: 1225 name = "reserved"; 1226 flags |= IORESOURCE_DISABLED; 1227 break; 1228 1229 case EFI_PERSISTENT_MEMORY: 1230 name = "Persistent Memory"; 1231 desc = IORES_DESC_PERSISTENT_MEMORY; 1232 break; 1233 1234 case EFI_RESERVED_TYPE: 1235 case EFI_RUNTIME_SERVICES_CODE: 1236 case EFI_RUNTIME_SERVICES_DATA: 1237 case EFI_ACPI_RECLAIM_MEMORY: 1238 default: 1239 name = "reserved"; 1240 break; 1241 } 1242 1243 if ((res = kzalloc(sizeof(struct resource), 1244 GFP_KERNEL)) == NULL) { 1245 printk(KERN_ERR 1246 "failed to allocate resource for iomem\n"); 1247 return; 1248 } 1249 1250 res->name = name; 1251 res->start = md->phys_addr; 1252 res->end = md->phys_addr + efi_md_size(md) - 1; 1253 res->flags = flags; 1254 res->desc = desc; 1255 1256 if (insert_resource(&iomem_resource, res) < 0) 1257 kfree(res); 1258 else { 1259 /* 1260 * We don't know which region contains 1261 * kernel data so we try it repeatedly and 1262 * let the resource manager test it. 1263 */ 1264 insert_resource(res, code_resource); 1265 insert_resource(res, data_resource); 1266 insert_resource(res, bss_resource); 1267 #ifdef CONFIG_KEXEC 1268 insert_resource(res, &efi_memmap_res); 1269 insert_resource(res, &boot_param_res); 1270 if (crashk_res.end > crashk_res.start) 1271 insert_resource(res, &crashk_res); 1272 #endif 1273 } 1274 } 1275 } 1276 1277 #ifdef CONFIG_KEXEC 1278 /* find a block of memory aligned to 64M exclude reserved regions 1279 rsvd_regions are sorted 1280 */ 1281 unsigned long __init 1282 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n) 1283 { 1284 int i; 1285 u64 start, end; 1286 u64 alignment = 1UL << _PAGE_SIZE_64M; 1287 void *efi_map_start, *efi_map_end, *p; 1288 efi_memory_desc_t *md; 1289 u64 efi_desc_size; 1290 1291 efi_map_start = __va(ia64_boot_param->efi_memmap); 1292 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1293 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1294 1295 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1296 md = p; 1297 if (!efi_wb(md)) 1298 continue; 1299 start = ALIGN(md->phys_addr, alignment); 1300 end = efi_md_end(md); 1301 for (i = 0; i < n; i++) { 1302 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) { 1303 if (__pa(r[i].start) > start + size) 1304 return start; 1305 start = ALIGN(__pa(r[i].end), alignment); 1306 if (i < n-1 && 1307 __pa(r[i+1].start) < start + size) 1308 continue; 1309 else 1310 break; 1311 } 1312 } 1313 if (end > start + size) 1314 return start; 1315 } 1316 1317 printk(KERN_WARNING 1318 "Cannot reserve 0x%lx byte of memory for crashdump\n", size); 1319 return ~0UL; 1320 } 1321 #endif 1322 1323 #ifdef CONFIG_CRASH_DUMP 1324 /* locate the size find a the descriptor at a certain address */ 1325 unsigned long __init 1326 vmcore_find_descriptor_size (unsigned long address) 1327 { 1328 void *efi_map_start, *efi_map_end, *p; 1329 efi_memory_desc_t *md; 1330 u64 efi_desc_size; 1331 unsigned long ret = 0; 1332 1333 efi_map_start = __va(ia64_boot_param->efi_memmap); 1334 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1335 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1336 1337 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1338 md = p; 1339 if (efi_wb(md) && md->type == EFI_LOADER_DATA 1340 && md->phys_addr == address) { 1341 ret = efi_md_size(md); 1342 break; 1343 } 1344 } 1345 1346 if (ret == 0) 1347 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n"); 1348 1349 return ret; 1350 } 1351 #endif 1352