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