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 45 extern efi_status_t efi_call_phys (void *, ...); 46 47 struct efi efi; 48 EXPORT_SYMBOL(efi); 49 static efi_runtime_services_t *runtime; 50 static 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) \ 55 static efi_status_t \ 56 prefix##_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) \ 72 static efi_status_t \ 73 prefix##_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) \ 86 static efi_status_t \ 87 prefix##_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) \ 102 static efi_status_t \ 103 prefix##_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) \ 120 static efi_status_t \ 121 prefix##_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) \ 140 static efi_status_t \ 141 prefix##_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) \ 156 static efi_status_t \ 157 prefix##_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) \ 174 static efi_status_t \ 175 prefix##_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) \ 189 static void \ 190 prefix##_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)) 208 209 STUB_GET_TIME(phys, phys_ptr) 210 STUB_SET_TIME(phys, phys_ptr) 211 STUB_GET_WAKEUP_TIME(phys, phys_ptr) 212 STUB_SET_WAKEUP_TIME(phys, phys_ptr) 213 STUB_GET_VARIABLE(phys, phys_ptr) 214 STUB_GET_NEXT_VARIABLE(phys, phys_ptr) 215 STUB_SET_VARIABLE(phys, phys_ptr) 216 STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr) 217 STUB_RESET_SYSTEM(phys, phys_ptr) 218 219 #define id(arg) arg 220 221 STUB_GET_TIME(virt, id) 222 STUB_SET_TIME(virt, id) 223 STUB_GET_WAKEUP_TIME(virt, id) 224 STUB_SET_WAKEUP_TIME(virt, id) 225 STUB_GET_VARIABLE(virt, id) 226 STUB_GET_NEXT_VARIABLE(virt, id) 227 STUB_SET_VARIABLE(virt, id) 228 STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id) 229 STUB_RESET_SYSTEM(virt, id) 230 231 void 232 efi_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 } 245 246 static int 247 is_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 } 262 263 typedef struct kern_memdesc { 264 u64 attribute; 265 u64 start; 266 u64 num_pages; 267 } kern_memdesc_t; 268 269 static kern_memdesc_t *kern_memmap; 270 271 #define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT) 272 273 static inline u64 274 kmd_end(kern_memdesc_t *kmd) 275 { 276 return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT)); 277 } 278 279 static inline u64 280 efi_md_end(efi_memory_desc_t *md) 281 { 282 return (md->phys_addr + efi_md_size(md)); 283 } 284 285 static inline int 286 efi_wb(efi_memory_desc_t *md) 287 { 288 return (md->attribute & EFI_MEMORY_WB); 289 } 290 291 static inline int 292 efi_uc(efi_memory_desc_t *md) 293 { 294 return (md->attribute & EFI_MEMORY_UC); 295 } 296 297 static void 298 walk (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 */ 319 void 320 efi_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 */ 329 void 330 efi_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 */ 340 void * 341 efi_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 } 407 408 409 static 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 */ 424 static 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 } 442 443 void 444 efi_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 } 463 464 void __init 465 efi_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 } 625 626 void 627 efi_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 #if 0 651 md->virt_addr = ia64_remap(md->phys_addr, 652 (_PAGE_A | 653 _PAGE_P | 654 _PAGE_D | 655 _PAGE_MA_WC | 656 _PAGE_PL_0 | 657 _PAGE_AR_RW)); 658 #else 659 printk(KERN_INFO "EFI_MEMORY_WC mapping\n"); 660 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 661 #endif 662 } else if (md->attribute & EFI_MEMORY_WT) { 663 #if 0 664 md->virt_addr = ia64_remap(md->phys_addr, 665 (_PAGE_A | 666 _PAGE_P | 667 _PAGE_D | 668 _PAGE_MA_WT | 669 _PAGE_PL_0 | 670 _PAGE_AR_RW)); 671 #else 672 printk(KERN_INFO "EFI_MEMORY_WT mapping\n"); 673 md->virt_addr = (u64) ioremap(md->phys_addr, 0); 674 #endif 675 } 676 } 677 } 678 679 status = efi_call_phys(__va(runtime->set_virtual_address_map), 680 ia64_boot_param->efi_memmap_size, 681 efi_desc_size, 682 ia64_boot_param->efi_memdesc_version, 683 ia64_boot_param->efi_memmap); 684 if (status != EFI_SUCCESS) { 685 printk(KERN_WARNING "warning: unable to switch EFI into " 686 "virtual mode (status=%lu)\n", status); 687 return; 688 } 689 690 /* 691 * Now that EFI is in virtual mode, we call the EFI functions more 692 * efficiently: 693 */ 694 efi.get_time = virt_get_time; 695 efi.set_time = virt_set_time; 696 efi.get_wakeup_time = virt_get_wakeup_time; 697 efi.set_wakeup_time = virt_set_wakeup_time; 698 efi.get_variable = virt_get_variable; 699 efi.get_next_variable = virt_get_next_variable; 700 efi.set_variable = virt_set_variable; 701 efi.get_next_high_mono_count = virt_get_next_high_mono_count; 702 efi.reset_system = virt_reset_system; 703 } 704 705 /* 706 * Walk the EFI memory map looking for the I/O port range. There can only be 707 * one entry of this type, other I/O port ranges should be described via ACPI. 708 */ 709 u64 710 efi_get_iobase (void) 711 { 712 void *efi_map_start, *efi_map_end, *p; 713 efi_memory_desc_t *md; 714 u64 efi_desc_size; 715 716 efi_map_start = __va(ia64_boot_param->efi_memmap); 717 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 718 efi_desc_size = ia64_boot_param->efi_memdesc_size; 719 720 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 721 md = p; 722 if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) { 723 if (md->attribute & EFI_MEMORY_UC) 724 return md->phys_addr; 725 } 726 } 727 return 0; 728 } 729 730 static struct kern_memdesc * 731 kern_memory_descriptor (unsigned long phys_addr) 732 { 733 struct kern_memdesc *md; 734 735 for (md = kern_memmap; md->start != ~0UL; md++) { 736 if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT)) 737 return md; 738 } 739 return NULL; 740 } 741 742 static efi_memory_desc_t * 743 efi_memory_descriptor (unsigned long phys_addr) 744 { 745 void *efi_map_start, *efi_map_end, *p; 746 efi_memory_desc_t *md; 747 u64 efi_desc_size; 748 749 efi_map_start = __va(ia64_boot_param->efi_memmap); 750 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 751 efi_desc_size = ia64_boot_param->efi_memdesc_size; 752 753 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 754 md = p; 755 756 if (phys_addr - md->phys_addr < efi_md_size(md)) 757 return md; 758 } 759 return NULL; 760 } 761 762 static int 763 efi_memmap_intersects (unsigned long phys_addr, unsigned long size) 764 { 765 void *efi_map_start, *efi_map_end, *p; 766 efi_memory_desc_t *md; 767 u64 efi_desc_size; 768 unsigned long end; 769 770 efi_map_start = __va(ia64_boot_param->efi_memmap); 771 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 772 efi_desc_size = ia64_boot_param->efi_memdesc_size; 773 774 end = phys_addr + size; 775 776 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 777 md = p; 778 if (md->phys_addr < end && efi_md_end(md) > phys_addr) 779 return 1; 780 } 781 return 0; 782 } 783 784 u32 785 efi_mem_type (unsigned long phys_addr) 786 { 787 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 788 789 if (md) 790 return md->type; 791 return 0; 792 } 793 794 u64 795 efi_mem_attributes (unsigned long phys_addr) 796 { 797 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 798 799 if (md) 800 return md->attribute; 801 return 0; 802 } 803 EXPORT_SYMBOL(efi_mem_attributes); 804 805 u64 806 efi_mem_attribute (unsigned long phys_addr, unsigned long size) 807 { 808 unsigned long end = phys_addr + size; 809 efi_memory_desc_t *md = efi_memory_descriptor(phys_addr); 810 u64 attr; 811 812 if (!md) 813 return 0; 814 815 /* 816 * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells 817 * the kernel that firmware needs this region mapped. 818 */ 819 attr = md->attribute & ~EFI_MEMORY_RUNTIME; 820 do { 821 unsigned long md_end = efi_md_end(md); 822 823 if (end <= md_end) 824 return attr; 825 826 md = efi_memory_descriptor(md_end); 827 if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr) 828 return 0; 829 } while (md); 830 return 0; /* never reached */ 831 } 832 833 u64 834 kern_mem_attribute (unsigned long phys_addr, unsigned long size) 835 { 836 unsigned long end = phys_addr + size; 837 struct kern_memdesc *md; 838 u64 attr; 839 840 /* 841 * This is a hack for ioremap calls before we set up kern_memmap. 842 * Maybe we should do efi_memmap_init() earlier instead. 843 */ 844 if (!kern_memmap) { 845 attr = efi_mem_attribute(phys_addr, size); 846 if (attr & EFI_MEMORY_WB) 847 return EFI_MEMORY_WB; 848 return 0; 849 } 850 851 md = kern_memory_descriptor(phys_addr); 852 if (!md) 853 return 0; 854 855 attr = md->attribute; 856 do { 857 unsigned long md_end = kmd_end(md); 858 859 if (end <= md_end) 860 return attr; 861 862 md = kern_memory_descriptor(md_end); 863 if (!md || md->attribute != attr) 864 return 0; 865 } while (md); 866 return 0; /* never reached */ 867 } 868 EXPORT_SYMBOL(kern_mem_attribute); 869 870 int 871 valid_phys_addr_range (unsigned long phys_addr, unsigned long size) 872 { 873 u64 attr; 874 875 /* 876 * /dev/mem reads and writes use copy_to_user(), which implicitly 877 * uses a granule-sized kernel identity mapping. It's really 878 * only safe to do this for regions in kern_memmap. For more 879 * details, see Documentation/ia64/aliasing.txt. 880 */ 881 attr = kern_mem_attribute(phys_addr, size); 882 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) 883 return 1; 884 return 0; 885 } 886 887 int 888 valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size) 889 { 890 unsigned long phys_addr = pfn << PAGE_SHIFT; 891 u64 attr; 892 893 attr = efi_mem_attribute(phys_addr, size); 894 895 /* 896 * /dev/mem mmap uses normal user pages, so we don't need the entire 897 * granule, but the entire region we're mapping must support the same 898 * attribute. 899 */ 900 if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC) 901 return 1; 902 903 /* 904 * Intel firmware doesn't tell us about all the MMIO regions, so 905 * in general we have to allow mmap requests. But if EFI *does* 906 * tell us about anything inside this region, we should deny it. 907 * The user can always map a smaller region to avoid the overlap. 908 */ 909 if (efi_memmap_intersects(phys_addr, size)) 910 return 0; 911 912 return 1; 913 } 914 915 pgprot_t 916 phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size, 917 pgprot_t vma_prot) 918 { 919 unsigned long phys_addr = pfn << PAGE_SHIFT; 920 u64 attr; 921 922 /* 923 * For /dev/mem mmap, we use user mappings, but if the region is 924 * in kern_memmap (and hence may be covered by a kernel mapping), 925 * we must use the same attribute as the kernel mapping. 926 */ 927 attr = kern_mem_attribute(phys_addr, size); 928 if (attr & EFI_MEMORY_WB) 929 return pgprot_cacheable(vma_prot); 930 else if (attr & EFI_MEMORY_UC) 931 return pgprot_noncached(vma_prot); 932 933 /* 934 * Some chipsets don't support UC access to memory. If 935 * WB is supported, we prefer that. 936 */ 937 if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) 938 return pgprot_cacheable(vma_prot); 939 940 return pgprot_noncached(vma_prot); 941 } 942 943 int __init 944 efi_uart_console_only(void) 945 { 946 efi_status_t status; 947 char *s, name[] = "ConOut"; 948 efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID; 949 efi_char16_t *utf16, name_utf16[32]; 950 unsigned char data[1024]; 951 unsigned long size = sizeof(data); 952 struct efi_generic_dev_path *hdr, *end_addr; 953 int uart = 0; 954 955 /* Convert to UTF-16 */ 956 utf16 = name_utf16; 957 s = name; 958 while (*s) 959 *utf16++ = *s++ & 0x7f; 960 *utf16 = 0; 961 962 status = efi.get_variable(name_utf16, &guid, NULL, &size, data); 963 if (status != EFI_SUCCESS) { 964 printk(KERN_ERR "No EFI %s variable?\n", name); 965 return 0; 966 } 967 968 hdr = (struct efi_generic_dev_path *) data; 969 end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size); 970 while (hdr < end_addr) { 971 if (hdr->type == EFI_DEV_MSG && 972 hdr->sub_type == EFI_DEV_MSG_UART) 973 uart = 1; 974 else if (hdr->type == EFI_DEV_END_PATH || 975 hdr->type == EFI_DEV_END_PATH2) { 976 if (!uart) 977 return 0; 978 if (hdr->sub_type == EFI_DEV_END_ENTIRE) 979 return 1; 980 uart = 0; 981 } 982 hdr = (struct efi_generic_dev_path *)((u8 *) hdr + hdr->length); 983 } 984 printk(KERN_ERR "Malformed %s value\n", name); 985 return 0; 986 } 987 988 /* 989 * Look for the first granule aligned memory descriptor memory 990 * that is big enough to hold EFI memory map. Make sure this 991 * descriptor is atleast granule sized so it does not get trimmed 992 */ 993 struct kern_memdesc * 994 find_memmap_space (void) 995 { 996 u64 contig_low=0, contig_high=0; 997 u64 as = 0, ae; 998 void *efi_map_start, *efi_map_end, *p, *q; 999 efi_memory_desc_t *md, *pmd = NULL, *check_md; 1000 u64 space_needed, efi_desc_size; 1001 unsigned long total_mem = 0; 1002 1003 efi_map_start = __va(ia64_boot_param->efi_memmap); 1004 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1005 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1006 1007 /* 1008 * Worst case: we need 3 kernel descriptors for each efi descriptor 1009 * (if every entry has a WB part in the middle, and UC head and tail), 1010 * plus one for the end marker. 1011 */ 1012 space_needed = sizeof(kern_memdesc_t) * 1013 (3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1); 1014 1015 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { 1016 md = p; 1017 if (!efi_wb(md)) { 1018 continue; 1019 } 1020 if (pmd == NULL || !efi_wb(pmd) || 1021 efi_md_end(pmd) != md->phys_addr) { 1022 contig_low = GRANULEROUNDUP(md->phys_addr); 1023 contig_high = efi_md_end(md); 1024 for (q = p + efi_desc_size; q < efi_map_end; 1025 q += efi_desc_size) { 1026 check_md = q; 1027 if (!efi_wb(check_md)) 1028 break; 1029 if (contig_high != check_md->phys_addr) 1030 break; 1031 contig_high = efi_md_end(check_md); 1032 } 1033 contig_high = GRANULEROUNDDOWN(contig_high); 1034 } 1035 if (!is_memory_available(md) || md->type == EFI_LOADER_DATA) 1036 continue; 1037 1038 /* Round ends inward to granule boundaries */ 1039 as = max(contig_low, md->phys_addr); 1040 ae = min(contig_high, efi_md_end(md)); 1041 1042 /* keep within max_addr= and min_addr= command line arg */ 1043 as = max(as, min_addr); 1044 ae = min(ae, max_addr); 1045 if (ae <= as) 1046 continue; 1047 1048 /* avoid going over mem= command line arg */ 1049 if (total_mem + (ae - as) > mem_limit) 1050 ae -= total_mem + (ae - as) - mem_limit; 1051 1052 if (ae <= as) 1053 continue; 1054 1055 if (ae - as > space_needed) 1056 break; 1057 } 1058 if (p >= efi_map_end) 1059 panic("Can't allocate space for kernel memory descriptors"); 1060 1061 return __va(as); 1062 } 1063 1064 /* 1065 * Walk the EFI memory map and gather all memory available for kernel 1066 * to use. We can allocate partial granules only if the unavailable 1067 * parts exist, and are WB. 1068 */ 1069 unsigned long 1070 efi_memmap_init(u64 *s, u64 *e) 1071 { 1072 struct kern_memdesc *k, *prev = NULL; 1073 u64 contig_low=0, contig_high=0; 1074 u64 as, ae, lim; 1075 void *efi_map_start, *efi_map_end, *p, *q; 1076 efi_memory_desc_t *md, *pmd = NULL, *check_md; 1077 u64 efi_desc_size; 1078 unsigned long total_mem = 0; 1079 1080 k = kern_memmap = find_memmap_space(); 1081 1082 efi_map_start = __va(ia64_boot_param->efi_memmap); 1083 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1084 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1085 1086 for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) { 1087 md = p; 1088 if (!efi_wb(md)) { 1089 if (efi_uc(md) && 1090 (md->type == EFI_CONVENTIONAL_MEMORY || 1091 md->type == EFI_BOOT_SERVICES_DATA)) { 1092 k->attribute = EFI_MEMORY_UC; 1093 k->start = md->phys_addr; 1094 k->num_pages = md->num_pages; 1095 k++; 1096 } 1097 continue; 1098 } 1099 if (pmd == NULL || !efi_wb(pmd) || 1100 efi_md_end(pmd) != md->phys_addr) { 1101 contig_low = GRANULEROUNDUP(md->phys_addr); 1102 contig_high = efi_md_end(md); 1103 for (q = p + efi_desc_size; q < efi_map_end; 1104 q += efi_desc_size) { 1105 check_md = q; 1106 if (!efi_wb(check_md)) 1107 break; 1108 if (contig_high != check_md->phys_addr) 1109 break; 1110 contig_high = efi_md_end(check_md); 1111 } 1112 contig_high = GRANULEROUNDDOWN(contig_high); 1113 } 1114 if (!is_memory_available(md)) 1115 continue; 1116 1117 #ifdef CONFIG_CRASH_DUMP 1118 /* saved_max_pfn should ignore max_addr= command line arg */ 1119 if (saved_max_pfn < (efi_md_end(md) >> PAGE_SHIFT)) 1120 saved_max_pfn = (efi_md_end(md) >> PAGE_SHIFT); 1121 #endif 1122 /* 1123 * Round ends inward to granule boundaries 1124 * Give trimmings to uncached allocator 1125 */ 1126 if (md->phys_addr < contig_low) { 1127 lim = min(efi_md_end(md), contig_low); 1128 if (efi_uc(md)) { 1129 if (k > kern_memmap && 1130 (k-1)->attribute == EFI_MEMORY_UC && 1131 kmd_end(k-1) == md->phys_addr) { 1132 (k-1)->num_pages += 1133 (lim - md->phys_addr) 1134 >> EFI_PAGE_SHIFT; 1135 } else { 1136 k->attribute = EFI_MEMORY_UC; 1137 k->start = md->phys_addr; 1138 k->num_pages = (lim - md->phys_addr) 1139 >> EFI_PAGE_SHIFT; 1140 k++; 1141 } 1142 } 1143 as = contig_low; 1144 } else 1145 as = md->phys_addr; 1146 1147 if (efi_md_end(md) > contig_high) { 1148 lim = max(md->phys_addr, contig_high); 1149 if (efi_uc(md)) { 1150 if (lim == md->phys_addr && k > kern_memmap && 1151 (k-1)->attribute == EFI_MEMORY_UC && 1152 kmd_end(k-1) == md->phys_addr) { 1153 (k-1)->num_pages += md->num_pages; 1154 } else { 1155 k->attribute = EFI_MEMORY_UC; 1156 k->start = lim; 1157 k->num_pages = (efi_md_end(md) - lim) 1158 >> EFI_PAGE_SHIFT; 1159 k++; 1160 } 1161 } 1162 ae = contig_high; 1163 } else 1164 ae = efi_md_end(md); 1165 1166 /* keep within max_addr= and min_addr= command line arg */ 1167 as = max(as, min_addr); 1168 ae = min(ae, max_addr); 1169 if (ae <= as) 1170 continue; 1171 1172 /* avoid going over mem= command line arg */ 1173 if (total_mem + (ae - as) > mem_limit) 1174 ae -= total_mem + (ae - as) - mem_limit; 1175 1176 if (ae <= as) 1177 continue; 1178 if (prev && kmd_end(prev) == md->phys_addr) { 1179 prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT; 1180 total_mem += ae - as; 1181 continue; 1182 } 1183 k->attribute = EFI_MEMORY_WB; 1184 k->start = as; 1185 k->num_pages = (ae - as) >> EFI_PAGE_SHIFT; 1186 total_mem += ae - as; 1187 prev = k++; 1188 } 1189 k->start = ~0L; /* end-marker */ 1190 1191 /* reserve the memory we are using for kern_memmap */ 1192 *s = (u64)kern_memmap; 1193 *e = (u64)++k; 1194 1195 return total_mem; 1196 } 1197 1198 void 1199 efi_initialize_iomem_resources(struct resource *code_resource, 1200 struct resource *data_resource, 1201 struct resource *bss_resource) 1202 { 1203 struct resource *res; 1204 void *efi_map_start, *efi_map_end, *p; 1205 efi_memory_desc_t *md; 1206 u64 efi_desc_size; 1207 char *name; 1208 unsigned long flags; 1209 1210 efi_map_start = __va(ia64_boot_param->efi_memmap); 1211 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1212 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1213 1214 res = NULL; 1215 1216 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1217 md = p; 1218 1219 if (md->num_pages == 0) /* should not happen */ 1220 continue; 1221 1222 flags = IORESOURCE_MEM | IORESOURCE_BUSY; 1223 switch (md->type) { 1224 1225 case EFI_MEMORY_MAPPED_IO: 1226 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 1227 continue; 1228 1229 case EFI_LOADER_CODE: 1230 case EFI_LOADER_DATA: 1231 case EFI_BOOT_SERVICES_DATA: 1232 case EFI_BOOT_SERVICES_CODE: 1233 case EFI_CONVENTIONAL_MEMORY: 1234 if (md->attribute & EFI_MEMORY_WP) { 1235 name = "System ROM"; 1236 flags |= IORESOURCE_READONLY; 1237 } else if (md->attribute == EFI_MEMORY_UC) 1238 name = "Uncached RAM"; 1239 else 1240 name = "System RAM"; 1241 break; 1242 1243 case EFI_ACPI_MEMORY_NVS: 1244 name = "ACPI Non-volatile Storage"; 1245 break; 1246 1247 case EFI_UNUSABLE_MEMORY: 1248 name = "reserved"; 1249 flags |= IORESOURCE_DISABLED; 1250 break; 1251 1252 case EFI_RESERVED_TYPE: 1253 case EFI_RUNTIME_SERVICES_CODE: 1254 case EFI_RUNTIME_SERVICES_DATA: 1255 case EFI_ACPI_RECLAIM_MEMORY: 1256 default: 1257 name = "reserved"; 1258 break; 1259 } 1260 1261 if ((res = kzalloc(sizeof(struct resource), 1262 GFP_KERNEL)) == NULL) { 1263 printk(KERN_ERR 1264 "failed to allocate resource for iomem\n"); 1265 return; 1266 } 1267 1268 res->name = name; 1269 res->start = md->phys_addr; 1270 res->end = md->phys_addr + efi_md_size(md) - 1; 1271 res->flags = flags; 1272 1273 if (insert_resource(&iomem_resource, res) < 0) 1274 kfree(res); 1275 else { 1276 /* 1277 * We don't know which region contains 1278 * kernel data so we try it repeatedly and 1279 * let the resource manager test it. 1280 */ 1281 insert_resource(res, code_resource); 1282 insert_resource(res, data_resource); 1283 insert_resource(res, bss_resource); 1284 #ifdef CONFIG_KEXEC 1285 insert_resource(res, &efi_memmap_res); 1286 insert_resource(res, &boot_param_res); 1287 if (crashk_res.end > crashk_res.start) 1288 insert_resource(res, &crashk_res); 1289 #endif 1290 } 1291 } 1292 } 1293 1294 #ifdef CONFIG_KEXEC 1295 /* find a block of memory aligned to 64M exclude reserved regions 1296 rsvd_regions are sorted 1297 */ 1298 unsigned long __init 1299 kdump_find_rsvd_region (unsigned long size, struct rsvd_region *r, int n) 1300 { 1301 int i; 1302 u64 start, end; 1303 u64 alignment = 1UL << _PAGE_SIZE_64M; 1304 void *efi_map_start, *efi_map_end, *p; 1305 efi_memory_desc_t *md; 1306 u64 efi_desc_size; 1307 1308 efi_map_start = __va(ia64_boot_param->efi_memmap); 1309 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1310 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1311 1312 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1313 md = p; 1314 if (!efi_wb(md)) 1315 continue; 1316 start = ALIGN(md->phys_addr, alignment); 1317 end = efi_md_end(md); 1318 for (i = 0; i < n; i++) { 1319 if (__pa(r[i].start) >= start && __pa(r[i].end) < end) { 1320 if (__pa(r[i].start) > start + size) 1321 return start; 1322 start = ALIGN(__pa(r[i].end), alignment); 1323 if (i < n-1 && 1324 __pa(r[i+1].start) < start + size) 1325 continue; 1326 else 1327 break; 1328 } 1329 } 1330 if (end > start + size) 1331 return start; 1332 } 1333 1334 printk(KERN_WARNING 1335 "Cannot reserve 0x%lx byte of memory for crashdump\n", size); 1336 return ~0UL; 1337 } 1338 #endif 1339 1340 #ifdef CONFIG_CRASH_DUMP 1341 /* locate the size find a the descriptor at a certain address */ 1342 unsigned long __init 1343 vmcore_find_descriptor_size (unsigned long address) 1344 { 1345 void *efi_map_start, *efi_map_end, *p; 1346 efi_memory_desc_t *md; 1347 u64 efi_desc_size; 1348 unsigned long ret = 0; 1349 1350 efi_map_start = __va(ia64_boot_param->efi_memmap); 1351 efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; 1352 efi_desc_size = ia64_boot_param->efi_memdesc_size; 1353 1354 for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { 1355 md = p; 1356 if (efi_wb(md) && md->type == EFI_LOADER_DATA 1357 && md->phys_addr == address) { 1358 ret = efi_md_size(md); 1359 break; 1360 } 1361 } 1362 1363 if (ret == 0) 1364 printk(KERN_WARNING "Cannot locate EFI vmcore descriptor\n"); 1365 1366 return ret; 1367 } 1368 #endif 1369