1/* 2 * Extensible Firmware Interface 3 * 4 * Based on Extensible Firmware Interface Specification version 0.9 5 * April 30, 1999 6 * 7 * Copyright (C) 1999 VA Linux Systems 8 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 9 * Copyright (C) 1999-2003 Hewlett-Packard Co. 10 * David Mosberger-Tang <davidm@hpl.hp.com> 11 * Stephane Eranian <eranian@hpl.hp.com> 12 * (c) Copyright 2006 Hewlett-Packard Development Company, L.P. 13 * Bjorn Helgaas <bjorn.helgaas@hp.com> 14 * 15 * All EFI Runtime Services are not implemented yet as EFI only 16 * supports physical mode addressing on SoftSDV. This is to be fixed 17 * in a future version. --drummond 1999-07-20 18 * 19 * Implemented EFI runtime services and virtual mode calls. --davidm 20 * 21 * Goutham Rao: <goutham.rao@intel.com> 22 * Skip non-WB memory and ignore empty memory ranges. 23 */ 24#include <linux/module.h> 25#include <linux/bootmem.h> 26#include <linux/kernel.h> 27#include <linux/init.h> 28#include <linux/types.h> 29#include <linux/slab.h> 30#include <linux/time.h> 31#include <linux/efi.h> 32#include <linux/kexec.h> 33#include <linux/mm.h> 34 35#include <asm/io.h> 36#include <asm/kregs.h> 37#include <asm/meminit.h> 38#include <asm/pgtable.h> 39#include <asm/processor.h> 40#include <asm/mca.h> 41#include <asm/tlbflush.h> 42 43#define EFI_DEBUG 0 44 45extern efi_status_t efi_call_phys (void *, ...); 46 47struct efi efi; 48EXPORT_SYMBOL(efi); 49static efi_runtime_services_t *runtime; 50static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL; 51 52#define efi_call_virt(f, args...) (*(f))(args) 53 54#define STUB_GET_TIME(prefix, adjust_arg) \ 55static efi_status_t \ 56prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \ 57{ \ 58 struct ia64_fpreg fr[6]; \ 59 efi_time_cap_t *atc = NULL; \ 60 efi_status_t ret; \ 61 \ 62 if (tc) \ 63 atc = adjust_arg(tc); \ 64 ia64_save_scratch_fpregs(fr); \ 65 ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), \ 66 adjust_arg(tm), atc); \ 67 ia64_load_scratch_fpregs(fr); \ 68 return ret; \ 69} 70 71#define STUB_SET_TIME(prefix, adjust_arg) \ 72static efi_status_t \ 73prefix##_set_time (efi_time_t *tm) \ 74{ \ 75 struct ia64_fpreg fr[6]; \ 76 efi_status_t ret; \ 77 \ 78 ia64_save_scratch_fpregs(fr); \ 79 ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), \ 80 adjust_arg(tm)); \ 81 ia64_load_scratch_fpregs(fr); \ 82 return ret; \ 83} 84 85#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \ 86static efi_status_t \ 87prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, \ 88 efi_time_t *tm) \ 89{ \ 90 struct ia64_fpreg fr[6]; \ 91 efi_status_t ret; \ 92 \ 93 ia64_save_scratch_fpregs(fr); \ 94 ret = efi_call_##prefix( \ 95 (efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \ 96 adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \ 97 ia64_load_scratch_fpregs(fr); \ 98 return ret; \ 99} 100 101#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \ 102static efi_status_t \ 103prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \ 104{ \ 105 struct ia64_fpreg fr[6]; \ 106 efi_time_t *atm = NULL; \ 107 efi_status_t ret; \ 108 \ 109 if (tm) \ 110 atm = adjust_arg(tm); \ 111 ia64_save_scratch_fpregs(fr); \ 112 ret = efi_call_##prefix( \ 113 (efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \ 114 enabled, atm); \ 115 ia64_load_scratch_fpregs(fr); \ 116 return ret; \ 117} 118 119#define STUB_GET_VARIABLE(prefix, adjust_arg) \ 120static efi_status_t \ 121prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \ 122 unsigned long *data_size, void *data) \ 123{ \ 124 struct ia64_fpreg fr[6]; \ 125 u32 *aattr = NULL; \ 126 efi_status_t ret; \ 127 \ 128 if (attr) \ 129 aattr = adjust_arg(attr); \ 130 ia64_save_scratch_fpregs(fr); \ 131 ret = efi_call_##prefix( \ 132 (efi_get_variable_t *) __va(runtime->get_variable), \ 133 adjust_arg(name), adjust_arg(vendor), aattr, \ 134 adjust_arg(data_size), adjust_arg(data)); \ 135 ia64_load_scratch_fpregs(fr); \ 136 return ret; \ 137} 138 139#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \ 140static efi_status_t \ 141prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, \ 142 efi_guid_t *vendor) \ 143{ \ 144 struct ia64_fpreg fr[6]; \ 145 efi_status_t ret; \ 146 \ 147 ia64_save_scratch_fpregs(fr); \ 148 ret = efi_call_##prefix( \ 149 (efi_get_next_variable_t *) __va(runtime->get_next_variable), \ 150 adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \ 151 ia64_load_scratch_fpregs(fr); \ 152 return ret; \ 153} 154 155#define STUB_SET_VARIABLE(prefix, adjust_arg) \ 156static efi_status_t \ 157prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, \ 158 unsigned long attr, unsigned long data_size, \ 159 void *data) \ 160{ \ 161 struct ia64_fpreg fr[6]; \ 162 efi_status_t ret; \ 163 \ 164 ia64_save_scratch_fpregs(fr); \ 165 ret = efi_call_##prefix( \ 166 (efi_set_variable_t *) __va(runtime->set_variable), \ 167 adjust_arg(name), adjust_arg(vendor), attr, data_size, \ 168 adjust_arg(data)); \ 169 ia64_load_scratch_fpregs(fr); \ 170 return ret; \ 171} 172 173#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \ 174static efi_status_t \ 175prefix##_get_next_high_mono_count (u32 *count) \ 176{ \ 177 struct ia64_fpreg fr[6]; \ 178 efi_status_t ret; \ 179 \ 180 ia64_save_scratch_fpregs(fr); \ 181 ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \ 182 __va(runtime->get_next_high_mono_count), \ 183 adjust_arg(count)); \ 184 ia64_load_scratch_fpregs(fr); \ 185 return ret; \ 186} 187 188#define STUB_RESET_SYSTEM(prefix, adjust_arg) \ 189static void \ 190prefix##_reset_system (int reset_type, efi_status_t status, \ 191 unsigned long data_size, efi_char16_t *data) \ 192{ \ 193 struct ia64_fpreg fr[6]; \ 194 efi_char16_t *adata = NULL; \ 195 \ 196 if (data) \ 197 adata = adjust_arg(data); \ 198 \ 199 ia64_save_scratch_fpregs(fr); \ 200 efi_call_##prefix( \ 201 (efi_reset_system_t *) __va(runtime->reset_system), \ 202 reset_type, status, data_size, adata); \ 203 /* should not return, but just in case... */ \ 204 ia64_load_scratch_fpregs(fr); \ 205} 206 207#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg)) 208 209STUB_GET_TIME(phys, phys_ptr) 210STUB_SET_TIME(phys, phys_ptr) 211STUB_GET_WAKEUP_TIME(phys, phys_ptr) 212STUB_SET_WAKEUP_TIME(phys, phys_ptr) 213STUB_GET_VARIABLE(phys, phys_ptr) 214STUB_GET_NEXT_VARIABLE(phys, phys_ptr) 215STUB_SET_VARIABLE(phys, phys_ptr) 216STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr) 217STUB_RESET_SYSTEM(phys, phys_ptr) 218 219#define id(arg) arg 220 221STUB_GET_TIME(virt, id) 222STUB_SET_TIME(virt, id) 223STUB_GET_WAKEUP_TIME(virt, id) 224STUB_SET_WAKEUP_TIME(virt, id) 225STUB_GET_VARIABLE(virt, id) 226STUB_GET_NEXT_VARIABLE(virt, id) 227STUB_SET_VARIABLE(virt, id) 228STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id) 229STUB_RESET_SYSTEM(virt, id) 230 231void 232efi_gettimeofday (struct timespec *ts) 233{ 234 efi_time_t tm; 235 236 if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS) { 237 memset(ts, 0, sizeof(*ts)); 238 return; 239 } 240 241 ts->tv_sec = mktime(tm.year, tm.month, tm.day, 242 tm.hour, tm.minute, tm.second); 243 ts->tv_nsec = tm.nanosecond; 244} 245 246static int 247is_memory_available (efi_memory_desc_t *md) 248{ 249 if (!(md->attribute & EFI_MEMORY_WB)) 250 return 0; 251 252 switch (md->type) { 253 case EFI_LOADER_CODE: 254 case EFI_LOADER_DATA: 255 case EFI_BOOT_SERVICES_CODE: 256 case EFI_BOOT_SERVICES_DATA: 257 case EFI_CONVENTIONAL_MEMORY: 258 return 1; 259 } 260 return 0; 261} 262 263typedef struct kern_memdesc { 264 u64 attribute; 265 u64 start; 266 u64 num_pages; 267} kern_memdesc_t; 268 269static kern_memdesc_t *kern_memmap; 270 271#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT) 272 273static inline u64 274kmd_end(kern_memdesc_t *kmd) 275{ 276 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT)); 277} 278 279static inline u64 280efi_md_end(efi_memory_desc_t *md) 281{ 282 return (md->phys_addr + efi_md_size(md)); 283} 284 285static inline int 286efi_wb(efi_memory_desc_t *md) 287{ 288 return (md->attribute & EFI_MEMORY_WB); 289} 290 291static inline int 292efi_uc(efi_memory_desc_t *md) 293{ 294 return (md->attribute & EFI_MEMORY_UC); 295} 296 297static void 298walk (efi_freemem_callback_t callback, void *arg, u64 attr) 299{ 300 kern_memdesc_t *k; 301 u64 start, end, voff; 302 303 voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET; 304 for (k = kern_memmap; k->start != ~0UL; k++) { 305 if (k->attribute != attr) 306 continue; 307 start = PAGE_ALIGN(k->start); 308 end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK; 309 if (start < end) 310 if ((*callback)(start + voff, end + voff, arg) < 0) 311 return; 312 } 313} 314 315/* 316 * Walk the EFI memory map and call CALLBACK once for each EFI memory 317 * descriptor that has memory that is available for OS use. 318 */ 319void 320efi_memmap_walk (efi_freemem_callback_t callback, void *arg) 321{ 322 walk(callback, arg, EFI_MEMORY_WB); 323} 324 325/* 326 * Walk the EFI memory map and call CALLBACK once for each EFI memory 327 * descriptor that has memory that is available for uncached allocator. 328 */ 329void 330efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg) 331{ 332 walk(callback, arg, EFI_MEMORY_UC); 333} 334 335/* 336 * Look for the PAL_CODE region reported by EFI and map it using an 337 * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor 338 * Abstraction Layer chapter 11 in ADAG 339 */ 340void * 341efi_get_pal_addr (void) 342{ 343 void *efi_map_start, *efi_map_end, *p; 344 efi_memory_desc_t *md; 345 u64 efi_desc_size; 346 int pal_code_count = 0; 347 u64 vaddr, mask; 348 349 efi_map_start = __va(ia64_boot_param->efi_memmap); 350 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 351 efi_desc_size = ia64_boot_param->efi_memdesc_size; 352 353 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 354 md = p; 355 if (md->type != EFI_PAL_CODE) 356 continue; 357 358 if (++pal_code_count > 1) { 359 printk(KERN_ERR "Too many EFI Pal Code memory ranges, " 360 "dropped @ %llx\n", md->phys_addr); 361 continue; 362 } 363 /* 364 * The only ITLB entry in region 7 that is used is the one 365 * installed by __start(). That entry covers a 64MB range. 366 */ 367 mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1); 368 vaddr = PAGE_OFFSET + md->phys_addr; 369 370 /* 371 * We must check that the PAL mapping won't overlap with the 372 * kernel mapping. 373 * 374 * PAL code is guaranteed to be aligned on a power of 2 between 375 * 4k and 256KB and that only one ITR is needed to map it. This 376 * implies that the PAL code is always aligned on its size, 377 * i.e., the closest matching page size supported by the TLB. 378 * Therefore PAL code is guaranteed never to cross a 64MB unless 379 * it is bigger than 64MB (very unlikely!). So for now the 380 * following test is enough to determine whether or not we need 381 * a dedicated ITR for the PAL code. 382 */ 383 if ((vaddr & mask) == (KERNEL_START & mask)) { 384 printk(KERN_INFO "%s: no need to install ITR for PAL code\n", 385 __func__); 386 continue; 387 } 388 389 if (efi_md_size(md) > IA64_GRANULE_SIZE) 390 panic("Whoa! PAL code size bigger than a granule!"); 391 392#if EFI_DEBUG 393 mask = ~((1 << IA64_GRANULE_SHIFT) - 1); 394 395 printk(KERN_INFO "CPU %d: mapping PAL code " 396 "[0x%lx-0x%lx) into [0x%lx-0x%lx)\n", 397 smp_processor_id(), md->phys_addr, 398 md->phys_addr + efi_md_size(md), 399 vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE); 400#endif 401 return __va(md->phys_addr); 402 } 403 printk(KERN_WARNING "%s: no PAL-code memory-descriptor found\n", 404 __func__); 405 return NULL; 406} 407 408 409static u8 __init palo_checksum(u8 *buffer, u32 length) 410{ 411 u8 sum = 0; 412 u8 *end = buffer + length; 413 414 while (buffer < end) 415 sum = (u8) (sum + *(buffer++)); 416 417 return sum; 418} 419 420/* 421 * Parse and handle PALO table which is published at: 422 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf 423 */ 424static void __init handle_palo(unsigned long palo_phys) 425{ 426 struct palo_table *palo = __va(palo_phys); 427 u8 checksum; 428 429 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) { 430 printk(KERN_INFO "PALO signature incorrect.\n"); 431 return; 432 } 433 434 checksum = palo_checksum((u8 *)palo, palo->length); 435 if (checksum) { 436 printk(KERN_INFO "PALO checksum incorrect.\n"); 437 return; 438 } 439 440 setup_ptcg_sem(palo->max_tlb_purges, NPTCG_FROM_PALO); 441} 442 443void 444efi_map_pal_code (void) 445{ 446 void *pal_vaddr = efi_get_pal_addr (); 447 u64 psr; 448 449 if (!pal_vaddr) 450 return; 451 452 /* 453 * Cannot write to CRx with PSR.ic=1 454 */ 455 psr = ia64_clear_ic(); 456 ia64_itr(0x1, IA64_TR_PALCODE, 457 GRANULEROUNDDOWN((unsigned long) pal_vaddr), 458 pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)), 459 IA64_GRANULE_SHIFT); 460 paravirt_dv_serialize_data(); 461 ia64_set_psr(psr); /* restore psr */ 462} 463 464void __init 465efi_init (void) 466{ 467 void *efi_map_start, *efi_map_end; 468 efi_config_table_t *config_tables; 469 efi_char16_t *c16; 470 u64 efi_desc_size; 471 char *cp, vendor[100] = "unknown"; 472 int i; 473 unsigned long palo_phys; 474 475 /* 476 * It's too early to be able to use the standard kernel command line 477 * support... 478 */ 479 for (cp = boot_command_line; *cp; ) { 480 if (memcmp(cp, "mem=", 4) == 0) { 481 mem_limit = memparse(cp + 4, &cp); 482 } else if (memcmp(cp, "max_addr=", 9) == 0) { 483 max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp)); 484 } else if (memcmp(cp, "min_addr=", 9) == 0) { 485 min_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp)); 486 } else { 487 while (*cp != ' ' && *cp) 488 ++cp; 489 while (*cp == ' ') 490 ++cp; 491 } 492 } 493 if (min_addr != 0UL) 494 printk(KERN_INFO "Ignoring memory below %lluMB\n", 495 min_addr >> 20); 496 if (max_addr != ~0UL) 497 printk(KERN_INFO "Ignoring memory above %lluMB\n", 498 max_addr >> 20); 499 500 efi.systab = __va(ia64_boot_param->efi_systab); 501 502 /* 503 * Verify the EFI Table 504 */ 505 if (efi.systab == NULL) 506 panic("Whoa! Can't find EFI system table.\n"); 507 if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 508 panic("Whoa! EFI system table signature incorrect\n"); 509 if ((efi.systab->hdr.revision >> 16) == 0) 510 printk(KERN_WARNING "Warning: EFI system table version " 511 "%d.%02d, expected 1.00 or greater\n", 512 efi.systab->hdr.revision >> 16, 513 efi.systab->hdr.revision & 0xffff); 514 515 config_tables = __va(efi.systab->tables); 516 517 /* Show what we know for posterity */ 518 c16 = __va(efi.systab->fw_vendor); 519 if (c16) { 520 for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i) 521 vendor[i] = *c16++; 522 vendor[i] = '\0'; 523 } 524 525 printk(KERN_INFO "EFI v%u.%.02u by %s:", 526 efi.systab->hdr.revision >> 16, 527 efi.systab->hdr.revision & 0xffff, vendor); 528 529 efi.mps = EFI_INVALID_TABLE_ADDR; 530 efi.acpi = EFI_INVALID_TABLE_ADDR; 531 efi.acpi20 = EFI_INVALID_TABLE_ADDR; 532 efi.smbios = EFI_INVALID_TABLE_ADDR; 533 efi.sal_systab = EFI_INVALID_TABLE_ADDR; 534 efi.boot_info = EFI_INVALID_TABLE_ADDR; 535 efi.hcdp = EFI_INVALID_TABLE_ADDR; 536 efi.uga = EFI_INVALID_TABLE_ADDR; 537 538 palo_phys = EFI_INVALID_TABLE_ADDR; 539 540 for (i = 0; i < (int) efi.systab->nr_tables; i++) { 541 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) { 542 efi.mps = config_tables[i].table; 543 printk(" MPS=0x%lx", config_tables[i].table); 544 } else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) { 545 efi.acpi20 = config_tables[i].table; 546 printk(" ACPI 2.0=0x%lx", config_tables[i].table); 547 } else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) { 548 efi.acpi = config_tables[i].table; 549 printk(" ACPI=0x%lx", config_tables[i].table); 550 } else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) { 551 efi.smbios = config_tables[i].table; 552 printk(" SMBIOS=0x%lx", config_tables[i].table); 553 } else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) { 554 efi.sal_systab = config_tables[i].table; 555 printk(" SALsystab=0x%lx", config_tables[i].table); 556 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) { 557 efi.hcdp = config_tables[i].table; 558 printk(" HCDP=0x%lx", config_tables[i].table); 559 } else if (efi_guidcmp(config_tables[i].guid, 560 PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID) == 0) { 561 palo_phys = config_tables[i].table; 562 printk(" PALO=0x%lx", config_tables[i].table); 563 } 564 } 565 printk("\n"); 566 567 if (palo_phys != EFI_INVALID_TABLE_ADDR) 568 handle_palo(palo_phys); 569 570 runtime = __va(efi.systab->runtime); 571 efi.get_time = phys_get_time; 572 efi.set_time = phys_set_time; 573 efi.get_wakeup_time = phys_get_wakeup_time; 574 efi.set_wakeup_time = phys_set_wakeup_time; 575 efi.get_variable = phys_get_variable; 576 efi.get_next_variable = phys_get_next_variable; 577 efi.set_variable = phys_set_variable; 578 efi.get_next_high_mono_count = phys_get_next_high_mono_count; 579 efi.reset_system = phys_reset_system; 580 581 efi_map_start = __va(ia64_boot_param->efi_memmap); 582 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 583 efi_desc_size = ia64_boot_param->efi_memdesc_size; 584 585#if EFI_DEBUG 586 /* print EFI memory map: */ 587 { 588 efi_memory_desc_t *md; 589 void *p; 590 591 for (i = 0, p = efi_map_start; p < efi_map_end; 592 ++i, p += efi_desc_size) 593 { 594 const char *unit; 595 unsigned long size; 596 597 md = p; 598 size = md->num_pages << EFI_PAGE_SHIFT; 599 600 if ((size >> 40) > 0) { 601 size >>= 40; 602 unit = "TB"; 603 } else if ((size >> 30) > 0) { 604 size >>= 30; 605 unit = "GB"; 606 } else if ((size >> 20) > 0) { 607 size >>= 20; 608 unit = "MB"; 609 } else { 610 size >>= 10; 611 unit = "KB"; 612 } 613 614 printk("mem%02d: type=%2u, attr=0x%016lx, " 615 "range=[0x%016lx-0x%016lx) (%4lu%s)\n", 616 i, md->type, md->attribute, md->phys_addr, 617 md->phys_addr + efi_md_size(md), size, unit); 618 } 619 } 620#endif 621 622 efi_map_pal_code(); 623 efi_enter_virtual_mode(); 624} 625 626void 627efi_enter_virtual_mode (void) 628{ 629 void *efi_map_start, *efi_map_end, *p; 630 efi_memory_desc_t *md; 631 efi_status_t status; 632 u64 efi_desc_size; 633 634 efi_map_start = __va(ia64_boot_param->efi_memmap); 635 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 636 efi_desc_size = ia64_boot_param->efi_memdesc_size; 637 638 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 639 md = p; 640 if (md->attribute & EFI_MEMORY_RUNTIME) { 641 /* 642 * Some descriptors have multiple bits set, so the 643 * order of the tests is relevant. 644 */ 645 if (md->attribute & EFI_MEMORY_WB) { 646 md->virt_addr = (u64) __va(md->phys_addr); 647 } else if (md->attribute & EFI_MEMORY_UC) { 648 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 649 } else if (md->attribute & EFI_MEMORY_WC) { 650 printk(KERN_INFO "EFI_MEMORY_WC mapping\n"); 651 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 652 } else if (md->attribute & EFI_MEMORY_WT) { 653 printk(KERN_INFO "EFI_MEMORY_WT mapping\n"); 654 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 655 } 656 } 657 } 658 659 status = efi_call_phys(__va(runtime->set_virtual_address_map), 660 ia64_boot_param->efi_memmap_size, 661 efi_desc_size, 662 ia64_boot_param->efi_memdesc_version, 663 ia64_boot_param->efi_memmap); 664 if (status != EFI_SUCCESS) { 665 printk(KERN_WARNING "warning: unable to switch EFI into " 666 "virtual mode (status=%lu)\n", status); 667 return; 668 } 669 670 /* 671 * Now that EFI is in virtual mode, we call the EFI functions more 672 * efficiently: 673 */ 674 efi.get_time = virt_get_time; 675 efi.set_time = virt_set_time; 676 efi.get_wakeup_time = virt_get_wakeup_time; 677 efi.set_wakeup_time = virt_set_wakeup_time; 678 efi.get_variable = virt_get_variable; 679 efi.get_next_variable = virt_get_next_variable; 680 efi.set_variable = virt_set_variable; 681 efi.get_next_high_mono_count = virt_get_next_high_mono_count; 682 efi.reset_system = virt_reset_system; 683} 684 685/* 686 * Walk the EFI memory map looking for the I/O port range. There can only be 687 * one entry of this type, other I/O port ranges should be described via ACPI. 688 */ 689u64 690efi_get_iobase (void) 691{ 692 void *efi_map_start, *efi_map_end, *p; 693 efi_memory_desc_t *md; 694 u64 efi_desc_size; 695 696 efi_map_start = __va(ia64_boot_param->efi_memmap); 697 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 698 efi_desc_size = ia64_boot_param->efi_memdesc_size; 699 700 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 701 md = p; 702 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) { 703 if (md->attribute & EFI_MEMORY_UC) 704 return md->phys_addr; 705 } 706 } 707 return 0; 708} 709 710static struct kern_memdesc * 711kern_memory_descriptor (unsigned long phys_addr) 712{ 713 struct kern_memdesc *md; 714 715 for (md = kern_memmap; md->start != ~0UL; md++) { 716 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT)) 717 return md; 718 } 719 return NULL; 720} 721 722static efi_memory_desc_t * 723efi_memory_descriptor (unsigned long phys_addr) 724{ 725 void *efi_map_start, *efi_map_end, *p; 726 efi_memory_desc_t *md; 727 u64 efi_desc_size; 728 729 efi_map_start = __va(ia64_boot_param->efi_memmap); 730 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 731 efi_desc_size = ia64_boot_param->efi_memdesc_size; 732 733 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 734 md = p; 735 736 if (phys_addr - md->phys_addr < efi_md_size(md)) 737 return md; 738 } 739 return NULL; 740} 741 742static int 743efi_memmap_intersects (unsigned long phys_addr, unsigned long size) 744{ 745 void *efi_map_start, *efi_map_end, *p; 746 efi_memory_desc_t *md; 747 u64 efi_desc_size; 748 unsigned long end; 749 750 efi_map_start = __va(ia64_boot_param->efi_memmap); 751 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 752 efi_desc_size = ia64_boot_param->efi_memdesc_size; 753 754 end = phys_addr + size; 755 756 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 757 md = p; 758 if (md->phys_addr < end && efi_md_end(md) > phys_addr) 759 return 1; 760 } 761 return 0; 762} 763 764u32 765efi_mem_type (unsigned long phys_addr) 766{ 767 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 768 769 if (md) 770 return md->type; 771 return 0; 772} 773 774u64 775efi_mem_attributes (unsigned long phys_addr) 776{ 777 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 778 779 if (md) 780 return md->attribute; 781 return 0; 782} 783EXPORT_SYMBOL(efi_mem_attributes); 784 785u64 786efi_mem_attribute (unsigned long phys_addr, unsigned long size) 787{ 788 unsigned long end = phys_addr + size; 789 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 790 u64 attr; 791 792 if (!md) 793 return 0; 794 795 /* 796 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells 797 * the kernel that firmware needs this region mapped. 798 */ 799 attr = md->attribute & ~EFI_MEMORY_RUNTIME; 800 do { 801 unsigned long md_end = efi_md_end(md); 802 803 if (end <= md_end) 804 return attr; 805 806 md = efi_memory_descriptor(md_end); 807 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr) 808 return 0; 809 } while (md); 810 return 0; /* never reached */ 811} 812 813u64 814kern_mem_attribute (unsigned long phys_addr, unsigned long size) 815{ 816 unsigned long end = phys_addr + size; 817 struct kern_memdesc *md; 818 u64 attr; 819 820 /* 821 * This is a hack for ioremap calls before we set up kern_memmap. 822 * Maybe we should do efi_memmap_init() earlier instead. 823 */ 824 if (!kern_memmap) { 825 attr = efi_mem_attribute(phys_addr, size); 826 if (attr & EFI_MEMORY_WB) 827 return EFI_MEMORY_WB; 828 return 0; 829 } 830 831 md = kern_memory_descriptor(phys_addr); 832 if (!md) 833 return 0; 834 835 attr = md->attribute; 836 do { 837 unsigned long md_end = kmd_end(md); 838 839 if (end <= md_end) 840 return attr; 841 842 md = kern_memory_descriptor(md_end); 843 if (!md || md->attribute != attr) 844 return 0; 845 } while (md); 846 return 0; /* never reached */ 847} 848EXPORT_SYMBOL(kern_mem_attribute); 849 850int 851valid_phys_addr_range (unsigned long phys_addr, unsigned long size) 852{ 853 u64 attr; 854 855 /* 856 * /dev/mem reads and writes use copy_to_user(), which implicitly 857 * uses a granule-sized kernel identity mapping. It's really 858 * only safe to do this for regions in kern_memmap. For more 859 * details, see Documentation/ia64/aliasing.txt. 860 */ 861 attr = kern_mem_attribute(phys_addr, size); 862 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) 863 return 1; 864 return 0; 865} 866 867int 868valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size) 869{ 870 unsigned long phys_addr = pfn << PAGE_SHIFT; 871 u64 attr; 872 873 attr = efi_mem_attribute(phys_addr, size); 874 875 /* 876 * /dev/mem mmap uses normal user pages, so we don't need the entire 877 * granule, but the entire region we're mapping must support the same 878 * attribute. 879 */ 880 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) 881 return 1; 882 883 /* 884 * Intel firmware doesn't tell us about all the MMIO regions, so 885 * in general we have to allow mmap requests. But if EFI *does* 886 * tell us about anything inside this region, we should deny it. 887 * The user can always map a smaller region to avoid the overlap. 888 */ 889 if (efi_memmap_intersects(phys_addr, size)) 890 return 0; 891 892 return 1; 893} 894 895pgprot_t 896phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, 897 pgprot_t vma_prot) 898{ 899 unsigned long phys_addr = pfn << PAGE_SHIFT; 900 u64 attr; 901 902 /* 903 * For /dev/mem mmap, we use user mappings, but if the region is 904 * in kern_memmap (and hence may be covered by a kernel mapping), 905 * we must use the same attribute as the kernel mapping. 906 */ 907 attr = kern_mem_attribute(phys_addr, size); 908 if (attr & EFI_MEMORY_WB) 909 return pgprot_cacheable(vma_prot); 910 else if (attr & EFI_MEMORY_UC) 911 return pgprot_noncached(vma_prot); 912 913 /* 914 * Some chipsets don't support UC access to memory. If 915 * WB is supported, we prefer that. 916 */ 917 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) 918 return pgprot_cacheable(vma_prot); 919 920 return pgprot_noncached(vma_prot); 921} 922 923int __init 924efi_uart_console_only(void) 925{ 926 efi_status_t status; 927 char *s, name[] = "ConOut"; 928 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID; 929 efi_char16_t *utf16, name_utf16[32]; 930 unsigned char data[1024]; 931 unsigned long size = sizeof(data); 932 struct efi_generic_dev_path *hdr, *end_addr; 933 int uart = 0; 934 935 /* Convert to UTF-16 */ 936 utf16 = name_utf16; 937 s = name; 938 while (*s) 939 *utf16++ = *s++ & 0x7f; 940 *utf16 = 0; 941 942 status = efi.get_variable(name_utf16, &guid, NULL, &size, data); 943 if (status != EFI_SUCCESS) { 944 printk(KERN_ERR "No EFI %s variable?\n", name); 945 return 0; 946 } 947 948 hdr = (struct efi_generic_dev_path *) data; 949 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size); 950 while (hdr < end_addr) { 951 if (hdr->type == EFI_DEV_MSG && 952 hdr->sub_type == EFI_DEV_MSG_UART) 953 uart = 1; 954 else if (hdr->type == EFI_DEV_END_PATH || 955 hdr->type == EFI_DEV_END_PATH2) { 956 if (!uart) 957 return 0; 958 if (hdr->sub_type == EFI_DEV_END_ENTIRE) 959 return 1; 960 uart = 0; 961 } 962 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length); 963 } 964 printk(KERN_ERR "Malformed %s value\n", name); 965 return 0; 966} 967 968/* 969 * Look for the first granule aligned memory descriptor memory 970 * that is big enough to hold EFI memory map. Make sure this 971 * descriptor is atleast granule sized so it does not get trimmed 972 */ 973struct kern_memdesc * 974find_memmap_space (void) 975{ 976 u64 contig_low=0, contig_high=0; 977 u64 as = 0, ae; 978 void *efi_map_start, *efi_map_end, *p, *q; 979 efi_memory_desc_t *md, *pmd = NULL, *check_md; 980 u64 space_needed, efi_desc_size; 981 unsigned long total_mem = 0; 982 983 efi_map_start = __va(ia64_boot_param->efi_memmap); 984 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 985 efi_desc_size = ia64_boot_param->efi_memdesc_size; 986 987 /* 988 * Worst case: we need 3 kernel descriptors for each efi descriptor 989 * (if every entry has a WB part in the middle, and UC head and tail), 990 * plus one for the end marker. 991 */ 992 space_needed = sizeof(kern_memdesc_t) * 993 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1); 994 995 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { 996 md = p; 997 if (!efi_wb(md)) { 998 continue; 999 } 1000 if (pmd == NULL || !efi_wb(pmd) || 1001 efi_md_end(pmd) != md->phys_addr) { 1002 contig_low = GRANULEROUNDUP(md->phys_addr); 1003 contig_high = efi_md_end(md); 1004 for (q = p + efi_desc_size; q < efi_map_end; 1005 q += efi_desc_size) { 1006 check_md = q; 1007 if (!efi_wb(check_md)) 1008 break; 1009 if (contig_high != check_md->phys_addr) 1010 break; 1011 contig_high = efi_md_end(check_md); 1012 } 1013 contig_high = GRANULEROUNDDOWN(contig_high); 1014 } 1015 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA) 1016 continue; 1017 1018 /* Round ends inward to granule boundaries */ 1019 as = max(contig_low, md->phys_addr); 1020 ae = min(contig_high, efi_md_end(md)); 1021 1022 /* keep within max_addr= and min_addr= command line arg */ 1023 as = max(as, min_addr); 1024 ae = min(ae, max_addr); 1025 if (ae <= as) 1026 continue; 1027 1028 /* avoid going over mem= command line arg */ 1029 if (total_mem + (ae - as) > mem_limit) 1030 ae -= total_mem + (ae - as) - mem_limit; 1031 1032 if (ae <= as) 1033 continue; 1034 1035 if (ae - as > space_needed) 1036 break; 1037 } 1038 if (p >= efi_map_end) 1039 panic("Can't allocate space for kernel memory descriptors"); 1040 1041 return __va(as); 1042} 1043 1044/* 1045 * Walk the EFI memory map and gather all memory available for kernel 1046 * to use. We can allocate partial granules only if the unavailable 1047 * parts exist, and are WB. 1048 */ 1049unsigned long 1050efi_memmap_init(u64 *s, u64 *e) 1051{ 1052 struct kern_memdesc *k, *prev = NULL; 1053 u64 contig_low=0, contig_high=0; 1054 u64 as, ae, lim; 1055 void *efi_map_start, *efi_map_end, *p, *q; 1056 efi_memory_desc_t *md, *pmd = NULL, *check_md; 1057 u64 efi_desc_size; 1058 unsigned long total_mem = 0; 1059 1060 k = kern_memmap = find_memmap_space(); 1061 1062 efi_map_start = __va(ia64_boot_param->efi_memmap); 1063 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1064 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1065 1066 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { 1067 md = p; 1068 if (!efi_wb(md)) { 1069 if (efi_uc(md) && 1070 (md->type == EFI_CONVENTIONAL_MEMORY || 1071 md->type == EFI_BOOT_SERVICES_DATA)) { 1072 k->attribute = EFI_MEMORY_UC; 1073 k->start = md->phys_addr; 1074 k->num_pages = md->num_pages; 1075 k++; 1076 } 1077 continue; 1078 } 1079 if (pmd == NULL || !efi_wb(pmd) || 1080 efi_md_end(pmd) != md->phys_addr) { 1081 contig_low = GRANULEROUNDUP(md->phys_addr); 1082 contig_high = efi_md_end(md); 1083 for (q = p + efi_desc_size; q < efi_map_end; 1084 q += efi_desc_size) { 1085 check_md = q; 1086 if (!efi_wb(check_md)) 1087 break; 1088 if (contig_high != check_md->phys_addr) 1089 break; 1090 contig_high = efi_md_end(check_md); 1091 } 1092 contig_high = GRANULEROUNDDOWN(contig_high); 1093 } 1094 if (!is_memory_available(md)) 1095 continue; 1096 1097#ifdef CONFIG_CRASH_DUMP 1098 /* saved_max_pfn should ignore max_addr= command line arg */ 1099 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT)) 1100 saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT); 1101#endif 1102 /* 1103 * Round ends inward to granule boundaries 1104 * Give trimmings to uncached allocator 1105 */ 1106 if (md->phys_addr < contig_low) { 1107 lim = min(efi_md_end(md), contig_low); 1108 if (efi_uc(md)) { 1109 if (k > kern_memmap && 1110 (k-1)->attribute == EFI_MEMORY_UC && 1111 kmd_end(k-1) == md->phys_addr) { 1112 (k-1)->num_pages += 1113 (lim - md->phys_addr) 1114 >> EFI_PAGE_SHIFT; 1115 } else { 1116 k->attribute = EFI_MEMORY_UC; 1117 k->start = md->phys_addr; 1118 k->num_pages = (lim - md->phys_addr) 1119 >> EFI_PAGE_SHIFT; 1120 k++; 1121 } 1122 } 1123 as = contig_low; 1124 } else 1125 as = md->phys_addr; 1126 1127 if (efi_md_end(md) > contig_high) { 1128 lim = max(md->phys_addr, contig_high); 1129 if (efi_uc(md)) { 1130 if (lim == md->phys_addr && k > kern_memmap && 1131 (k-1)->attribute == EFI_MEMORY_UC && 1132 kmd_end(k-1) == md->phys_addr) { 1133 (k-1)->num_pages += md->num_pages; 1134 } else { 1135 k->attribute = EFI_MEMORY_UC; 1136 k->start = lim; 1137 k->num_pages = (efi_md_end(md) - lim) 1138 >> EFI_PAGE_SHIFT; 1139 k++; 1140 } 1141 } 1142 ae = contig_high; 1143 } else 1144 ae = efi_md_end(md); 1145 1146 /* keep within max_addr= and min_addr= command line arg */ 1147 as = max(as, min_addr); 1148 ae = min(ae, max_addr); 1149 if (ae <= as) 1150 continue; 1151 1152 /* avoid going over mem= command line arg */ 1153 if (total_mem + (ae - as) > mem_limit) 1154 ae -= total_mem + (ae - as) - mem_limit; 1155 1156 if (ae <= as) 1157 continue; 1158 if (prev && kmd_end(prev) == md->phys_addr) { 1159 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT; 1160 total_mem += ae - as; 1161 continue; 1162 } 1163 k->attribute = EFI_MEMORY_WB; 1164 k->start = as; 1165 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT; 1166 total_mem += ae - as; 1167 prev = k++; 1168 } 1169 k->start = ~0L; /* end-marker */ 1170 1171 /* reserve the memory we are using for kern_memmap */ 1172 *s = (u64)kern_memmap; 1173 *e = (u64)++k; 1174 1175 return total_mem; 1176} 1177 1178void 1179efi_initialize_iomem_resources(struct resource *code_resource, 1180 struct resource *data_resource, 1181 struct resource *bss_resource) 1182{ 1183 struct resource *res; 1184 void *efi_map_start, *efi_map_end, *p; 1185 efi_memory_desc_t *md; 1186 u64 efi_desc_size; 1187 char *name; 1188 unsigned long flags; 1189 1190 efi_map_start = __va(ia64_boot_param->efi_memmap); 1191 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1192 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1193 1194 res = NULL; 1195 1196 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1197 md = p; 1198 1199 if (md->num_pages == 0) /* should not happen */ 1200 continue; 1201 1202 flags = IORESOURCE_MEM | IORESOURCE_BUSY; 1203 switch (md->type) { 1204 1205 case EFI_MEMORY_MAPPED_IO: 1206 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 1207 continue; 1208 1209 case EFI_LOADER_CODE: 1210 case EFI_LOADER_DATA: 1211 case EFI_BOOT_SERVICES_DATA: 1212 case EFI_BOOT_SERVICES_CODE: 1213 case EFI_CONVENTIONAL_MEMORY: 1214 if (md->attribute & EFI_MEMORY_WP) { 1215 name = "System ROM"; 1216 flags |= IORESOURCE_READONLY; 1217 } else if (md->attribute == EFI_MEMORY_UC) 1218 name = "Uncached RAM"; 1219 else 1220 name = "System RAM"; 1221 break; 1222 1223 case EFI_ACPI_MEMORY_NVS: 1224 name = "ACPI Non-volatile Storage"; 1225 break; 1226 1227 case EFI_UNUSABLE_MEMORY: 1228 name = "reserved"; 1229 flags |= IORESOURCE_DISABLED; 1230 break; 1231 1232 case EFI_RESERVED_TYPE: 1233 case EFI_RUNTIME_SERVICES_CODE: 1234 case EFI_RUNTIME_SERVICES_DATA: 1235 case EFI_ACPI_RECLAIM_MEMORY: 1236 default: 1237 name = "reserved"; 1238 break; 1239 } 1240 1241 if ((res = kzalloc(sizeof(struct resource), 1242 GFP_KERNEL)) == NULL) { 1243 printk(KERN_ERR 1244 "failed to allocate resource for iomem\n"); 1245 return; 1246 } 1247 1248 res->name = name; 1249 res->start = md->phys_addr; 1250 res->end = md->phys_addr + efi_md_size(md) - 1; 1251 res->flags = flags; 1252 1253 if (insert_resource(&iomem_resource, res) < 0) 1254 kfree(res); 1255 else { 1256 /* 1257 * We don't know which region contains 1258 * kernel data so we try it repeatedly and 1259 * let the resource manager test it. 1260 */ 1261 insert_resource(res, code_resource); 1262 insert_resource(res, data_resource); 1263 insert_resource(res, bss_resource); 1264#ifdef CONFIG_KEXEC 1265 insert_resource(res, &efi_memmap_res); 1266 insert_resource(res, &boot_param_res); 1267 if (crashk_res.end > crashk_res.start) 1268 insert_resource(res, &crashk_res); 1269#endif 1270 } 1271 } 1272} 1273 1274#ifdef CONFIG_KEXEC 1275/* find a block of memory aligned to 64M exclude reserved regions 1276 rsvd_regions are sorted 1277 */ 1278unsigned long __init 1279kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n) 1280{ 1281 int i; 1282 u64 start, end; 1283 u64 alignment = 1UL << _PAGE_SIZE_64M; 1284 void *efi_map_start, *efi_map_end, *p; 1285 efi_memory_desc_t *md; 1286 u64 efi_desc_size; 1287 1288 efi_map_start = __va(ia64_boot_param->efi_memmap); 1289 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1290 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1291 1292 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1293 md = p; 1294 if (!efi_wb(md)) 1295 continue; 1296 start = ALIGN(md->phys_addr, alignment); 1297 end = efi_md_end(md); 1298 for (i = 0; i < n; i++) { 1299 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) { 1300 if (__pa(r[i].start) > start + size) 1301 return start; 1302 start = ALIGN(__pa(r[i].end), alignment); 1303 if (i < n-1 && 1304 __pa(r[i+1].start) < start + size) 1305 continue; 1306 else 1307 break; 1308 } 1309 } 1310 if (end > start + size) 1311 return start; 1312 } 1313 1314 printk(KERN_WARNING 1315 "Cannot reserve 0x%lx byte of memory for crashdump\n", size); 1316 return ~0UL; 1317} 1318#endif 1319 1320#ifdef CONFIG_CRASH_DUMP 1321/* locate the size find a the descriptor at a certain address */ 1322unsigned long __init 1323vmcore_find_descriptor_size (unsigned long address) 1324{ 1325 void *efi_map_start, *efi_map_end, *p; 1326 efi_memory_desc_t *md; 1327 u64 efi_desc_size; 1328 unsigned long ret = 0; 1329 1330 efi_map_start = __va(ia64_boot_param->efi_memmap); 1331 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1332 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1333 1334 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1335 md = p; 1336 if (efi_wb(md) && md->type == EFI_LOADER_DATA 1337 && md->phys_addr == address) { 1338 ret = efi_md_size(md); 1339 break; 1340 } 1341 } 1342 1343 if (ret == 0) 1344 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n"); 1345 1346 return ret; 1347} 1348#endif 1349