init_64.c revision 28dd033f43ca957cd751e02652b36c6fa364ca18
1/* 2 * linux/arch/x86_64/mm/init.c 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> 6 * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> 7 */ 8 9#include <linux/signal.h> 10#include <linux/sched.h> 11#include <linux/kernel.h> 12#include <linux/errno.h> 13#include <linux/string.h> 14#include <linux/types.h> 15#include <linux/ptrace.h> 16#include <linux/mman.h> 17#include <linux/mm.h> 18#include <linux/swap.h> 19#include <linux/smp.h> 20#include <linux/init.h> 21#include <linux/initrd.h> 22#include <linux/pagemap.h> 23#include <linux/bootmem.h> 24#include <linux/proc_fs.h> 25#include <linux/pci.h> 26#include <linux/pfn.h> 27#include <linux/poison.h> 28#include <linux/dma-mapping.h> 29#include <linux/module.h> 30#include <linux/memory_hotplug.h> 31#include <linux/nmi.h> 32 33#include <asm/processor.h> 34#include <asm/system.h> 35#include <asm/uaccess.h> 36#include <asm/pgtable.h> 37#include <asm/pgalloc.h> 38#include <asm/dma.h> 39#include <asm/fixmap.h> 40#include <asm/e820.h> 41#include <asm/apic.h> 42#include <asm/tlb.h> 43#include <asm/mmu_context.h> 44#include <asm/proto.h> 45#include <asm/smp.h> 46#include <asm/sections.h> 47#include <asm/kdebug.h> 48#include <asm/numa.h> 49#include <asm/cacheflush.h> 50 51/* 52 * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. 53 * The direct mapping extends to max_pfn_mapped, so that we can directly access 54 * apertures, ACPI and other tables without having to play with fixmaps. 55 */ 56unsigned long max_low_pfn_mapped; 57unsigned long max_pfn_mapped; 58 59static unsigned long dma_reserve __initdata; 60 61DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 62 63int direct_gbpages 64#ifdef CONFIG_DIRECT_GBPAGES 65 = 1 66#endif 67; 68 69static int __init parse_direct_gbpages_off(char *arg) 70{ 71 direct_gbpages = 0; 72 return 0; 73} 74early_param("nogbpages", parse_direct_gbpages_off); 75 76static int __init parse_direct_gbpages_on(char *arg) 77{ 78 direct_gbpages = 1; 79 return 0; 80} 81early_param("gbpages", parse_direct_gbpages_on); 82 83/* 84 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the 85 * physical space so we can cache the place of the first one and move 86 * around without checking the pgd every time. 87 */ 88 89int after_bootmem; 90 91/* 92 * NOTE: This function is marked __ref because it calls __init function 93 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. 94 */ 95static __ref void *spp_getpage(void) 96{ 97 void *ptr; 98 99 if (after_bootmem) 100 ptr = (void *) get_zeroed_page(GFP_ATOMIC); 101 else 102 ptr = alloc_bootmem_pages(PAGE_SIZE); 103 104 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { 105 panic("set_pte_phys: cannot allocate page data %s\n", 106 after_bootmem ? "after bootmem" : ""); 107 } 108 109 pr_debug("spp_getpage %p\n", ptr); 110 111 return ptr; 112} 113 114void 115set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) 116{ 117 pud_t *pud; 118 pmd_t *pmd; 119 pte_t *pte; 120 121 pud = pud_page + pud_index(vaddr); 122 if (pud_none(*pud)) { 123 pmd = (pmd_t *) spp_getpage(); 124 pud_populate(&init_mm, pud, pmd); 125 if (pmd != pmd_offset(pud, 0)) { 126 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", 127 pmd, pmd_offset(pud, 0)); 128 return; 129 } 130 } 131 pmd = pmd_offset(pud, vaddr); 132 if (pmd_none(*pmd)) { 133 pte = (pte_t *) spp_getpage(); 134 pmd_populate_kernel(&init_mm, pmd, pte); 135 if (pte != pte_offset_kernel(pmd, 0)) { 136 printk(KERN_ERR "PAGETABLE BUG #02!\n"); 137 return; 138 } 139 } 140 141 pte = pte_offset_kernel(pmd, vaddr); 142 if (!pte_none(*pte) && pte_val(new_pte) && 143 pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) 144 pte_ERROR(*pte); 145 set_pte(pte, new_pte); 146 147 /* 148 * It's enough to flush this one mapping. 149 * (PGE mappings get flushed as well) 150 */ 151 __flush_tlb_one(vaddr); 152} 153 154void 155set_pte_vaddr(unsigned long vaddr, pte_t pteval) 156{ 157 pgd_t *pgd; 158 pud_t *pud_page; 159 160 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); 161 162 pgd = pgd_offset_k(vaddr); 163 if (pgd_none(*pgd)) { 164 printk(KERN_ERR 165 "PGD FIXMAP MISSING, it should be setup in head.S!\n"); 166 return; 167 } 168 pud_page = (pud_t*)pgd_page_vaddr(*pgd); 169 set_pte_vaddr_pud(pud_page, vaddr, pteval); 170} 171 172/* 173 * Create large page table mappings for a range of physical addresses. 174 */ 175static void __init __init_extra_mapping(unsigned long phys, unsigned long size, 176 pgprot_t prot) 177{ 178 pgd_t *pgd; 179 pud_t *pud; 180 pmd_t *pmd; 181 182 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); 183 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { 184 pgd = pgd_offset_k((unsigned long)__va(phys)); 185 if (pgd_none(*pgd)) { 186 pud = (pud_t *) spp_getpage(); 187 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | 188 _PAGE_USER)); 189 } 190 pud = pud_offset(pgd, (unsigned long)__va(phys)); 191 if (pud_none(*pud)) { 192 pmd = (pmd_t *) spp_getpage(); 193 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | 194 _PAGE_USER)); 195 } 196 pmd = pmd_offset(pud, phys); 197 BUG_ON(!pmd_none(*pmd)); 198 set_pmd(pmd, __pmd(phys | pgprot_val(prot))); 199 } 200} 201 202void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) 203{ 204 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); 205} 206 207void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) 208{ 209 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); 210} 211 212/* 213 * The head.S code sets up the kernel high mapping: 214 * 215 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) 216 * 217 * phys_addr holds the negative offset to the kernel, which is added 218 * to the compile time generated pmds. This results in invalid pmds up 219 * to the point where we hit the physaddr 0 mapping. 220 * 221 * We limit the mappings to the region from _text to _end. _end is 222 * rounded up to the 2MB boundary. This catches the invalid pmds as 223 * well, as they are located before _text: 224 */ 225void __init cleanup_highmap(void) 226{ 227 unsigned long vaddr = __START_KERNEL_map; 228 unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1; 229 pmd_t *pmd = level2_kernel_pgt; 230 pmd_t *last_pmd = pmd + PTRS_PER_PMD; 231 232 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { 233 if (pmd_none(*pmd)) 234 continue; 235 if (vaddr < (unsigned long) _text || vaddr > end) 236 set_pmd(pmd, __pmd(0)); 237 } 238} 239 240static unsigned long __initdata table_start; 241static unsigned long __meminitdata table_end; 242static unsigned long __meminitdata table_top; 243 244static __ref void *alloc_low_page(unsigned long *phys) 245{ 246 unsigned long pfn = table_end++; 247 void *adr; 248 249 if (after_bootmem) { 250 adr = (void *)get_zeroed_page(GFP_ATOMIC); 251 *phys = __pa(adr); 252 253 return adr; 254 } 255 256 if (pfn >= table_top) 257 panic("alloc_low_page: ran out of memory"); 258 259 adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); 260 memset(adr, 0, PAGE_SIZE); 261 *phys = pfn * PAGE_SIZE; 262 return adr; 263} 264 265static __ref void unmap_low_page(void *adr) 266{ 267 if (after_bootmem) 268 return; 269 270 early_iounmap(adr, PAGE_SIZE); 271} 272 273static int physical_mapping_iter; 274 275static unsigned long __meminit 276phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end) 277{ 278 unsigned pages = 0; 279 unsigned long last_map_addr = end; 280 int i; 281 282 pte_t *pte = pte_page + pte_index(addr); 283 284 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { 285 286 if (addr >= end) { 287 if (!after_bootmem) { 288 for(; i < PTRS_PER_PTE; i++, pte++) 289 set_pte(pte, __pte(0)); 290 } 291 break; 292 } 293 294 if (pte_val(*pte)) 295 goto repeat_set_pte; 296 297 if (0) 298 printk(" pte=%p addr=%lx pte=%016lx\n", 299 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); 300 pages++; 301repeat_set_pte: 302 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL)); 303 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; 304 } 305 306 if (physical_mapping_iter == 1) 307 update_page_count(PG_LEVEL_4K, pages); 308 309 return last_map_addr; 310} 311 312static unsigned long __meminit 313phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end) 314{ 315 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); 316 317 return phys_pte_init(pte, address, end); 318} 319 320static unsigned long __meminit 321phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, 322 unsigned long page_size_mask) 323{ 324 unsigned long pages = 0; 325 unsigned long last_map_addr = end; 326 327 int i = pmd_index(address); 328 329 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { 330 unsigned long pte_phys; 331 pmd_t *pmd = pmd_page + pmd_index(address); 332 pte_t *pte; 333 334 if (address >= end) { 335 if (!after_bootmem) { 336 for (; i < PTRS_PER_PMD; i++, pmd++) 337 set_pmd(pmd, __pmd(0)); 338 } 339 break; 340 } 341 342 if (pmd_val(*pmd)) { 343 if (!pmd_large(*pmd)) { 344 spin_lock(&init_mm.page_table_lock); 345 last_map_addr = phys_pte_update(pmd, address, 346 end); 347 spin_unlock(&init_mm.page_table_lock); 348 continue; 349 } 350 goto repeat_set_pte; 351 } 352 353 if (page_size_mask & (1<<PG_LEVEL_2M)) { 354 pages++; 355repeat_set_pte: 356 spin_lock(&init_mm.page_table_lock); 357 set_pte((pte_t *)pmd, 358 pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); 359 spin_unlock(&init_mm.page_table_lock); 360 last_map_addr = (address & PMD_MASK) + PMD_SIZE; 361 continue; 362 } 363 364 pte = alloc_low_page(&pte_phys); 365 last_map_addr = phys_pte_init(pte, address, end); 366 unmap_low_page(pte); 367 368 spin_lock(&init_mm.page_table_lock); 369 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); 370 spin_unlock(&init_mm.page_table_lock); 371 } 372 if (physical_mapping_iter == 1) 373 update_page_count(PG_LEVEL_2M, pages); 374 return last_map_addr; 375} 376 377static unsigned long __meminit 378phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end, 379 unsigned long page_size_mask) 380{ 381 pmd_t *pmd = pmd_offset(pud, 0); 382 unsigned long last_map_addr; 383 384 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask); 385 __flush_tlb_all(); 386 return last_map_addr; 387} 388 389static unsigned long __meminit 390phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, 391 unsigned long page_size_mask) 392{ 393 unsigned long pages = 0; 394 unsigned long last_map_addr = end; 395 int i = pud_index(addr); 396 397 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { 398 unsigned long pmd_phys; 399 pud_t *pud = pud_page + pud_index(addr); 400 pmd_t *pmd; 401 402 if (addr >= end) 403 break; 404 405 if (!after_bootmem && 406 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { 407 set_pud(pud, __pud(0)); 408 continue; 409 } 410 411 if (pud_val(*pud)) { 412 if (!pud_large(*pud)) { 413 last_map_addr = phys_pmd_update(pud, addr, end, 414 page_size_mask); 415 continue; 416 } 417 418 goto repeat_set_pte; 419 } 420 421 if (page_size_mask & (1<<PG_LEVEL_1G)) { 422 pages++; 423repeat_set_pte: 424 spin_lock(&init_mm.page_table_lock); 425 set_pte((pte_t *)pud, 426 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); 427 spin_unlock(&init_mm.page_table_lock); 428 last_map_addr = (addr & PUD_MASK) + PUD_SIZE; 429 continue; 430 } 431 432 pmd = alloc_low_page(&pmd_phys); 433 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask); 434 unmap_low_page(pmd); 435 436 spin_lock(&init_mm.page_table_lock); 437 pud_populate(&init_mm, pud, __va(pmd_phys)); 438 spin_unlock(&init_mm.page_table_lock); 439 } 440 __flush_tlb_all(); 441 442 if (physical_mapping_iter == 1) 443 update_page_count(PG_LEVEL_1G, pages); 444 445 return last_map_addr; 446} 447 448static unsigned long __meminit 449phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, 450 unsigned long page_size_mask) 451{ 452 pud_t *pud; 453 454 pud = (pud_t *)pgd_page_vaddr(*pgd); 455 456 return phys_pud_init(pud, addr, end, page_size_mask); 457} 458 459static void __init find_early_table_space(unsigned long end, int use_pse, 460 int use_gbpages) 461{ 462 unsigned long puds, pmds, ptes, tables, start; 463 464 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; 465 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); 466 if (use_gbpages) { 467 unsigned long extra; 468 extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); 469 pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; 470 } else 471 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; 472 tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); 473 474 if (use_pse) { 475 unsigned long extra; 476 extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); 477 ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; 478 } else 479 ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; 480 tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE); 481 482 /* 483 * RED-PEN putting page tables only on node 0 could 484 * cause a hotspot and fill up ZONE_DMA. The page tables 485 * need roughly 0.5KB per GB. 486 */ 487 start = 0x8000; 488 table_start = find_e820_area(start, end, tables, PAGE_SIZE); 489 if (table_start == -1UL) 490 panic("Cannot find space for the kernel page tables"); 491 492 table_start >>= PAGE_SHIFT; 493 table_end = table_start; 494 table_top = table_start + (tables >> PAGE_SHIFT); 495 496 printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", 497 end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); 498} 499 500static void __init init_gbpages(void) 501{ 502 if (direct_gbpages && cpu_has_gbpages) 503 printk(KERN_INFO "Using GB pages for direct mapping\n"); 504 else 505 direct_gbpages = 0; 506} 507 508static int is_kernel(unsigned long pfn) 509{ 510 unsigned long pg_addresss = pfn << PAGE_SHIFT; 511 512 if (pg_addresss >= (unsigned long) __pa(_text) && 513 pg_addresss < (unsigned long) __pa(_end)) 514 return 1; 515 516 return 0; 517} 518 519static unsigned long __init kernel_physical_mapping_init(unsigned long start, 520 unsigned long end, 521 unsigned long page_size_mask) 522{ 523 524 unsigned long next, last_map_addr; 525 u64 cached_supported_pte_mask = __supported_pte_mask; 526 unsigned long cache_start = start; 527 unsigned long cache_end = end; 528 529 /* 530 * First iteration will setup identity mapping using large/small pages 531 * based on page_size_mask, with other attributes same as set by 532 * the early code in head_64.S 533 * 534 * Second iteration will setup the appropriate attributes 535 * as desired for the kernel identity mapping. 536 * 537 * This two pass mechanism conforms to the TLB app note which says: 538 * 539 * "Software should not write to a paging-structure entry in a way 540 * that would change, for any linear address, both the page size 541 * and either the page frame or attributes." 542 * 543 * For now, only difference between very early PTE attributes used in 544 * head_64.S and here is _PAGE_NX. 545 */ 546 BUILD_BUG_ON((__PAGE_KERNEL_LARGE & ~__PAGE_KERNEL_IDENT_LARGE_EXEC) 547 != _PAGE_NX); 548 __supported_pte_mask &= ~(_PAGE_NX); 549 physical_mapping_iter = 1; 550 551repeat: 552 last_map_addr = cache_end; 553 554 start = (unsigned long)__va(cache_start); 555 end = (unsigned long)__va(cache_end); 556 557 for (; start < end; start = next) { 558 pgd_t *pgd = pgd_offset_k(start); 559 unsigned long pud_phys; 560 pud_t *pud; 561 562 next = (start + PGDIR_SIZE) & PGDIR_MASK; 563 if (next > end) 564 next = end; 565 566 if (pgd_val(*pgd)) { 567 /* 568 * Static identity mappings will be overwritten 569 * with run-time mappings. For example, this allows 570 * the static 0-1GB identity mapping to be mapped 571 * non-executable with this. 572 */ 573 if (is_kernel(pte_pfn(*((pte_t *) pgd)))) 574 goto realloc; 575 576 last_map_addr = phys_pud_update(pgd, __pa(start), 577 __pa(end), page_size_mask); 578 continue; 579 } 580 581realloc: 582 pud = alloc_low_page(&pud_phys); 583 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), 584 page_size_mask); 585 unmap_low_page(pud); 586 587 spin_lock(&init_mm.page_table_lock); 588 pgd_populate(&init_mm, pgd, __va(pud_phys)); 589 spin_unlock(&init_mm.page_table_lock); 590 } 591 __flush_tlb_all(); 592 593 if (physical_mapping_iter == 1) { 594 physical_mapping_iter = 2; 595 /* 596 * Second iteration will set the actual desired PTE attributes. 597 */ 598 __supported_pte_mask = cached_supported_pte_mask; 599 goto repeat; 600 } 601 602 return last_map_addr; 603} 604 605struct map_range { 606 unsigned long start; 607 unsigned long end; 608 unsigned page_size_mask; 609}; 610 611#define NR_RANGE_MR 5 612 613static int save_mr(struct map_range *mr, int nr_range, 614 unsigned long start_pfn, unsigned long end_pfn, 615 unsigned long page_size_mask) 616{ 617 618 if (start_pfn < end_pfn) { 619 if (nr_range >= NR_RANGE_MR) 620 panic("run out of range for init_memory_mapping\n"); 621 mr[nr_range].start = start_pfn<<PAGE_SHIFT; 622 mr[nr_range].end = end_pfn<<PAGE_SHIFT; 623 mr[nr_range].page_size_mask = page_size_mask; 624 nr_range++; 625 } 626 627 return nr_range; 628} 629 630/* 631 * Setup the direct mapping of the physical memory at PAGE_OFFSET. 632 * This runs before bootmem is initialized and gets pages directly from 633 * the physical memory. To access them they are temporarily mapped. 634 */ 635unsigned long __init_refok init_memory_mapping(unsigned long start, 636 unsigned long end) 637{ 638 unsigned long last_map_addr = 0; 639 unsigned long page_size_mask = 0; 640 unsigned long start_pfn, end_pfn; 641 642 struct map_range mr[NR_RANGE_MR]; 643 int nr_range, i; 644 int use_pse, use_gbpages; 645 646 printk(KERN_INFO "init_memory_mapping\n"); 647 648 /* 649 * Find space for the kernel direct mapping tables. 650 * 651 * Later we should allocate these tables in the local node of the 652 * memory mapped. Unfortunately this is done currently before the 653 * nodes are discovered. 654 */ 655 if (!after_bootmem) 656 init_gbpages(); 657 658#ifdef CONFIG_DEBUG_PAGEALLOC 659 /* 660 * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. 661 * This will simplify cpa(), which otherwise needs to support splitting 662 * large pages into small in interrupt context, etc. 663 */ 664 use_pse = use_gbpages = 0; 665#else 666 use_pse = cpu_has_pse; 667 use_gbpages = direct_gbpages; 668#endif 669 670 if (use_gbpages) 671 page_size_mask |= 1 << PG_LEVEL_1G; 672 if (use_pse) 673 page_size_mask |= 1 << PG_LEVEL_2M; 674 675 memset(mr, 0, sizeof(mr)); 676 nr_range = 0; 677 678 /* head if not big page alignment ?*/ 679 start_pfn = start >> PAGE_SHIFT; 680 end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT) 681 << (PMD_SHIFT - PAGE_SHIFT); 682 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 683 684 /* big page (2M) range*/ 685 start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) 686 << (PMD_SHIFT - PAGE_SHIFT); 687 end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT) 688 << (PUD_SHIFT - PAGE_SHIFT); 689 if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT))) 690 end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)); 691 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 692 page_size_mask & (1<<PG_LEVEL_2M)); 693 694 /* big page (1G) range */ 695 start_pfn = end_pfn; 696 end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); 697 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 698 page_size_mask & 699 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); 700 701 /* tail is not big page (1G) alignment */ 702 start_pfn = end_pfn; 703 end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); 704 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 705 page_size_mask & (1<<PG_LEVEL_2M)); 706 707 /* tail is not big page (2M) alignment */ 708 start_pfn = end_pfn; 709 end_pfn = end>>PAGE_SHIFT; 710 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 711 712 /* try to merge same page size and continuous */ 713 for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { 714 unsigned long old_start; 715 if (mr[i].end != mr[i+1].start || 716 mr[i].page_size_mask != mr[i+1].page_size_mask) 717 continue; 718 /* move it */ 719 old_start = mr[i].start; 720 memmove(&mr[i], &mr[i+1], 721 (nr_range - 1 - i) * sizeof (struct map_range)); 722 mr[i].start = old_start; 723 nr_range--; 724 } 725 726 for (i = 0; i < nr_range; i++) 727 printk(KERN_DEBUG " %010lx - %010lx page %s\n", 728 mr[i].start, mr[i].end, 729 (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( 730 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); 731 732 if (!after_bootmem) 733 find_early_table_space(end, use_pse, use_gbpages); 734 735 for (i = 0; i < nr_range; i++) 736 last_map_addr = kernel_physical_mapping_init( 737 mr[i].start, mr[i].end, 738 mr[i].page_size_mask); 739 740 if (!after_bootmem) 741 mmu_cr4_features = read_cr4(); 742 __flush_tlb_all(); 743 744 if (!after_bootmem && table_end > table_start) 745 reserve_early(table_start << PAGE_SHIFT, 746 table_end << PAGE_SHIFT, "PGTABLE"); 747 748 printk(KERN_INFO "last_map_addr: %lx end: %lx\n", 749 last_map_addr, end); 750 751 if (!after_bootmem) 752 early_memtest(start, end); 753 754 return last_map_addr >> PAGE_SHIFT; 755} 756 757#ifndef CONFIG_NUMA 758void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) 759{ 760 unsigned long bootmap_size, bootmap; 761 762 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; 763 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, 764 PAGE_SIZE); 765 if (bootmap == -1L) 766 panic("Cannot find bootmem map of size %ld\n", bootmap_size); 767 /* don't touch min_low_pfn */ 768 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, 769 0, end_pfn); 770 e820_register_active_regions(0, start_pfn, end_pfn); 771 free_bootmem_with_active_regions(0, end_pfn); 772 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); 773 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); 774} 775 776void __init paging_init(void) 777{ 778 unsigned long max_zone_pfns[MAX_NR_ZONES]; 779 780 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 781 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; 782 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; 783 max_zone_pfns[ZONE_NORMAL] = max_pfn; 784 785 memory_present(0, 0, max_pfn); 786 sparse_init(); 787 free_area_init_nodes(max_zone_pfns); 788} 789#endif 790 791/* 792 * Memory hotplug specific functions 793 */ 794#ifdef CONFIG_MEMORY_HOTPLUG 795/* 796 * Memory is added always to NORMAL zone. This means you will never get 797 * additional DMA/DMA32 memory. 798 */ 799int arch_add_memory(int nid, u64 start, u64 size) 800{ 801 struct pglist_data *pgdat = NODE_DATA(nid); 802 struct zone *zone = pgdat->node_zones + ZONE_NORMAL; 803 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; 804 unsigned long nr_pages = size >> PAGE_SHIFT; 805 int ret; 806 807 last_mapped_pfn = init_memory_mapping(start, start + size-1); 808 if (last_mapped_pfn > max_pfn_mapped) 809 max_pfn_mapped = last_mapped_pfn; 810 811 ret = __add_pages(zone, start_pfn, nr_pages); 812 WARN_ON(1); 813 814 return ret; 815} 816EXPORT_SYMBOL_GPL(arch_add_memory); 817 818#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) 819int memory_add_physaddr_to_nid(u64 start) 820{ 821 return 0; 822} 823EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 824#endif 825 826#endif /* CONFIG_MEMORY_HOTPLUG */ 827 828/* 829 * devmem_is_allowed() checks to see if /dev/mem access to a certain address 830 * is valid. The argument is a physical page number. 831 * 832 * 833 * On x86, access has to be given to the first megabyte of ram because that area 834 * contains bios code and data regions used by X and dosemu and similar apps. 835 * Access has to be given to non-kernel-ram areas as well, these contain the PCI 836 * mmio resources as well as potential bios/acpi data regions. 837 */ 838int devmem_is_allowed(unsigned long pagenr) 839{ 840 if (pagenr <= 256) 841 return 1; 842 if (!page_is_ram(pagenr)) 843 return 1; 844 return 0; 845} 846 847 848static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, 849 kcore_modules, kcore_vsyscall; 850 851void __init mem_init(void) 852{ 853 long codesize, reservedpages, datasize, initsize; 854 855 pci_iommu_alloc(); 856 857 /* clear_bss() already clear the empty_zero_page */ 858 859 reservedpages = 0; 860 861 /* this will put all low memory onto the freelists */ 862#ifdef CONFIG_NUMA 863 totalram_pages = numa_free_all_bootmem(); 864#else 865 totalram_pages = free_all_bootmem(); 866#endif 867 reservedpages = max_pfn - totalram_pages - 868 absent_pages_in_range(0, max_pfn); 869 after_bootmem = 1; 870 871 codesize = (unsigned long) &_etext - (unsigned long) &_text; 872 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 873 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 874 875 /* Register memory areas for /proc/kcore */ 876 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 877 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 878 VMALLOC_END-VMALLOC_START); 879 kclist_add(&kcore_kernel, &_stext, _end - _stext); 880 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); 881 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, 882 VSYSCALL_END - VSYSCALL_START); 883 884 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 885 "%ldk reserved, %ldk data, %ldk init)\n", 886 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 887 max_pfn << (PAGE_SHIFT-10), 888 codesize >> 10, 889 reservedpages << (PAGE_SHIFT-10), 890 datasize >> 10, 891 initsize >> 10); 892} 893 894void free_init_pages(char *what, unsigned long begin, unsigned long end) 895{ 896 unsigned long addr = begin; 897 898 if (addr >= end) 899 return; 900 901 /* 902 * If debugging page accesses then do not free this memory but 903 * mark them not present - any buggy init-section access will 904 * create a kernel page fault: 905 */ 906#ifdef CONFIG_DEBUG_PAGEALLOC 907 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", 908 begin, PAGE_ALIGN(end)); 909 set_memory_np(begin, (end - begin) >> PAGE_SHIFT); 910#else 911 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); 912 913 for (; addr < end; addr += PAGE_SIZE) { 914 ClearPageReserved(virt_to_page(addr)); 915 init_page_count(virt_to_page(addr)); 916 memset((void *)(addr & ~(PAGE_SIZE-1)), 917 POISON_FREE_INITMEM, PAGE_SIZE); 918 free_page(addr); 919 totalram_pages++; 920 } 921#endif 922} 923 924void free_initmem(void) 925{ 926 free_init_pages("unused kernel memory", 927 (unsigned long)(&__init_begin), 928 (unsigned long)(&__init_end)); 929} 930 931#ifdef CONFIG_DEBUG_RODATA 932const int rodata_test_data = 0xC3; 933EXPORT_SYMBOL_GPL(rodata_test_data); 934 935void mark_rodata_ro(void) 936{ 937 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); 938 unsigned long rodata_start = 939 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; 940 941#ifdef CONFIG_DYNAMIC_FTRACE 942 /* Dynamic tracing modifies the kernel text section */ 943 start = rodata_start; 944#endif 945 946 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", 947 (end - start) >> 10); 948 set_memory_ro(start, (end - start) >> PAGE_SHIFT); 949 950 /* 951 * The rodata section (but not the kernel text!) should also be 952 * not-executable. 953 */ 954 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); 955 956 rodata_test(); 957 958#ifdef CONFIG_CPA_DEBUG 959 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); 960 set_memory_rw(start, (end-start) >> PAGE_SHIFT); 961 962 printk(KERN_INFO "Testing CPA: again\n"); 963 set_memory_ro(start, (end-start) >> PAGE_SHIFT); 964#endif 965} 966 967#endif 968 969#ifdef CONFIG_BLK_DEV_INITRD 970void free_initrd_mem(unsigned long start, unsigned long end) 971{ 972 free_init_pages("initrd memory", start, end); 973} 974#endif 975 976int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, 977 int flags) 978{ 979#ifdef CONFIG_NUMA 980 int nid, next_nid; 981 int ret; 982#endif 983 unsigned long pfn = phys >> PAGE_SHIFT; 984 985 if (pfn >= max_pfn) { 986 /* 987 * This can happen with kdump kernels when accessing 988 * firmware tables: 989 */ 990 if (pfn < max_pfn_mapped) 991 return -EFAULT; 992 993 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", 994 phys, len); 995 return -EFAULT; 996 } 997 998 /* Should check here against the e820 map to avoid double free */ 999#ifdef CONFIG_NUMA 1000 nid = phys_to_nid(phys); 1001 next_nid = phys_to_nid(phys + len - 1); 1002 if (nid == next_nid) 1003 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); 1004 else 1005 ret = reserve_bootmem(phys, len, flags); 1006 1007 if (ret != 0) 1008 return ret; 1009 1010#else 1011 reserve_bootmem(phys, len, BOOTMEM_DEFAULT); 1012#endif 1013 1014 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { 1015 dma_reserve += len / PAGE_SIZE; 1016 set_dma_reserve(dma_reserve); 1017 } 1018 1019 return 0; 1020} 1021 1022int kern_addr_valid(unsigned long addr) 1023{ 1024 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; 1025 pgd_t *pgd; 1026 pud_t *pud; 1027 pmd_t *pmd; 1028 pte_t *pte; 1029 1030 if (above != 0 && above != -1UL) 1031 return 0; 1032 1033 pgd = pgd_offset_k(addr); 1034 if (pgd_none(*pgd)) 1035 return 0; 1036 1037 pud = pud_offset(pgd, addr); 1038 if (pud_none(*pud)) 1039 return 0; 1040 1041 pmd = pmd_offset(pud, addr); 1042 if (pmd_none(*pmd)) 1043 return 0; 1044 1045 if (pmd_large(*pmd)) 1046 return pfn_valid(pmd_pfn(*pmd)); 1047 1048 pte = pte_offset_kernel(pmd, addr); 1049 if (pte_none(*pte)) 1050 return 0; 1051 1052 return pfn_valid(pte_pfn(*pte)); 1053} 1054 1055/* 1056 * A pseudo VMA to allow ptrace access for the vsyscall page. This only 1057 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does 1058 * not need special handling anymore: 1059 */ 1060static struct vm_area_struct gate_vma = { 1061 .vm_start = VSYSCALL_START, 1062 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), 1063 .vm_page_prot = PAGE_READONLY_EXEC, 1064 .vm_flags = VM_READ | VM_EXEC 1065}; 1066 1067struct vm_area_struct *get_gate_vma(struct task_struct *tsk) 1068{ 1069#ifdef CONFIG_IA32_EMULATION 1070 if (test_tsk_thread_flag(tsk, TIF_IA32)) 1071 return NULL; 1072#endif 1073 return &gate_vma; 1074} 1075 1076int in_gate_area(struct task_struct *task, unsigned long addr) 1077{ 1078 struct vm_area_struct *vma = get_gate_vma(task); 1079 1080 if (!vma) 1081 return 0; 1082 1083 return (addr >= vma->vm_start) && (addr < vma->vm_end); 1084} 1085 1086/* 1087 * Use this when you have no reliable task/vma, typically from interrupt 1088 * context. It is less reliable than using the task's vma and may give 1089 * false positives: 1090 */ 1091int in_gate_area_no_task(unsigned long addr) 1092{ 1093 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); 1094} 1095 1096const char *arch_vma_name(struct vm_area_struct *vma) 1097{ 1098 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) 1099 return "[vdso]"; 1100 if (vma == &gate_vma) 1101 return "[vsyscall]"; 1102 return NULL; 1103} 1104 1105#ifdef CONFIG_SPARSEMEM_VMEMMAP 1106/* 1107 * Initialise the sparsemem vmemmap using huge-pages at the PMD level. 1108 */ 1109static long __meminitdata addr_start, addr_end; 1110static void __meminitdata *p_start, *p_end; 1111static int __meminitdata node_start; 1112 1113int __meminit 1114vmemmap_populate(struct page *start_page, unsigned long size, int node) 1115{ 1116 unsigned long addr = (unsigned long)start_page; 1117 unsigned long end = (unsigned long)(start_page + size); 1118 unsigned long next; 1119 pgd_t *pgd; 1120 pud_t *pud; 1121 pmd_t *pmd; 1122 1123 for (; addr < end; addr = next) { 1124 void *p = NULL; 1125 1126 pgd = vmemmap_pgd_populate(addr, node); 1127 if (!pgd) 1128 return -ENOMEM; 1129 1130 pud = vmemmap_pud_populate(pgd, addr, node); 1131 if (!pud) 1132 return -ENOMEM; 1133 1134 if (!cpu_has_pse) { 1135 next = (addr + PAGE_SIZE) & PAGE_MASK; 1136 pmd = vmemmap_pmd_populate(pud, addr, node); 1137 1138 if (!pmd) 1139 return -ENOMEM; 1140 1141 p = vmemmap_pte_populate(pmd, addr, node); 1142 1143 if (!p) 1144 return -ENOMEM; 1145 1146 addr_end = addr + PAGE_SIZE; 1147 p_end = p + PAGE_SIZE; 1148 } else { 1149 next = pmd_addr_end(addr, end); 1150 1151 pmd = pmd_offset(pud, addr); 1152 if (pmd_none(*pmd)) { 1153 pte_t entry; 1154 1155 p = vmemmap_alloc_block(PMD_SIZE, node); 1156 if (!p) 1157 return -ENOMEM; 1158 1159 entry = pfn_pte(__pa(p) >> PAGE_SHIFT, 1160 PAGE_KERNEL_LARGE); 1161 set_pmd(pmd, __pmd(pte_val(entry))); 1162 1163 /* check to see if we have contiguous blocks */ 1164 if (p_end != p || node_start != node) { 1165 if (p_start) 1166 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", 1167 addr_start, addr_end-1, p_start, p_end-1, node_start); 1168 addr_start = addr; 1169 node_start = node; 1170 p_start = p; 1171 } 1172 1173 addr_end = addr + PMD_SIZE; 1174 p_end = p + PMD_SIZE; 1175 } else 1176 vmemmap_verify((pte_t *)pmd, node, addr, next); 1177 } 1178 1179 } 1180 return 0; 1181} 1182 1183void __meminit vmemmap_populate_print_last(void) 1184{ 1185 if (p_start) { 1186 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", 1187 addr_start, addr_end-1, p_start, p_end-1, node_start); 1188 p_start = NULL; 1189 p_end = NULL; 1190 node_start = 0; 1191 } 1192} 1193#endif 1194