init_64.c revision e22146e610bb7aed63282148740ab1d1b91e1d90
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 __meminitdata 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 89void show_mem(void) 90{ 91 long i, total = 0, reserved = 0; 92 long shared = 0, cached = 0; 93 struct page *page; 94 pg_data_t *pgdat; 95 96 printk(KERN_INFO "Mem-info:\n"); 97 show_free_areas(); 98 for_each_online_pgdat(pgdat) { 99 for (i = 0; i < pgdat->node_spanned_pages; ++i) { 100 /* 101 * This loop can take a while with 256 GB and 102 * 4k pages so defer the NMI watchdog: 103 */ 104 if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) 105 touch_nmi_watchdog(); 106 107 if (!pfn_valid(pgdat->node_start_pfn + i)) 108 continue; 109 110 page = pfn_to_page(pgdat->node_start_pfn + i); 111 total++; 112 if (PageReserved(page)) 113 reserved++; 114 else if (PageSwapCache(page)) 115 cached++; 116 else if (page_count(page)) 117 shared += page_count(page) - 1; 118 } 119 } 120 printk(KERN_INFO "%lu pages of RAM\n", total); 121 printk(KERN_INFO "%lu reserved pages\n", reserved); 122 printk(KERN_INFO "%lu pages shared\n", shared); 123 printk(KERN_INFO "%lu pages swap cached\n", cached); 124} 125 126int after_bootmem; 127 128static __init void *spp_getpage(void) 129{ 130 void *ptr; 131 132 if (after_bootmem) 133 ptr = (void *) get_zeroed_page(GFP_ATOMIC); 134 else 135 ptr = alloc_bootmem_pages(PAGE_SIZE); 136 137 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { 138 panic("set_pte_phys: cannot allocate page data %s\n", 139 after_bootmem ? "after bootmem" : ""); 140 } 141 142 pr_debug("spp_getpage %p\n", ptr); 143 144 return ptr; 145} 146 147void 148set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) 149{ 150 pud_t *pud; 151 pmd_t *pmd; 152 pte_t *pte; 153 154 pud = pud_page + pud_index(vaddr); 155 if (pud_none(*pud)) { 156 pmd = (pmd_t *) spp_getpage(); 157 pud_populate(&init_mm, pud, pmd); 158 if (pmd != pmd_offset(pud, 0)) { 159 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", 160 pmd, pmd_offset(pud, 0)); 161 return; 162 } 163 } 164 pmd = pmd_offset(pud, vaddr); 165 if (pmd_none(*pmd)) { 166 pte = (pte_t *) spp_getpage(); 167 pmd_populate_kernel(&init_mm, pmd, pte); 168 if (pte != pte_offset_kernel(pmd, 0)) { 169 printk(KERN_ERR "PAGETABLE BUG #02!\n"); 170 return; 171 } 172 } 173 174 pte = pte_offset_kernel(pmd, vaddr); 175 if (!pte_none(*pte) && pte_val(new_pte) && 176 pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) 177 pte_ERROR(*pte); 178 set_pte(pte, new_pte); 179 180 /* 181 * It's enough to flush this one mapping. 182 * (PGE mappings get flushed as well) 183 */ 184 __flush_tlb_one(vaddr); 185} 186 187void 188set_pte_vaddr(unsigned long vaddr, pte_t pteval) 189{ 190 pgd_t *pgd; 191 pud_t *pud_page; 192 193 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); 194 195 pgd = pgd_offset_k(vaddr); 196 if (pgd_none(*pgd)) { 197 printk(KERN_ERR 198 "PGD FIXMAP MISSING, it should be setup in head.S!\n"); 199 return; 200 } 201 pud_page = (pud_t*)pgd_page_vaddr(*pgd); 202 set_pte_vaddr_pud(pud_page, vaddr, pteval); 203} 204 205/* 206 * Create large page table mappings for a range of physical addresses. 207 */ 208static void __init __init_extra_mapping(unsigned long phys, unsigned long size, 209 pgprot_t prot) 210{ 211 pgd_t *pgd; 212 pud_t *pud; 213 pmd_t *pmd; 214 215 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); 216 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { 217 pgd = pgd_offset_k((unsigned long)__va(phys)); 218 if (pgd_none(*pgd)) { 219 pud = (pud_t *) spp_getpage(); 220 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | 221 _PAGE_USER)); 222 } 223 pud = pud_offset(pgd, (unsigned long)__va(phys)); 224 if (pud_none(*pud)) { 225 pmd = (pmd_t *) spp_getpage(); 226 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | 227 _PAGE_USER)); 228 } 229 pmd = pmd_offset(pud, phys); 230 BUG_ON(!pmd_none(*pmd)); 231 set_pmd(pmd, __pmd(phys | pgprot_val(prot))); 232 } 233} 234 235void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) 236{ 237 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); 238} 239 240void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) 241{ 242 __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); 243} 244 245/* 246 * The head.S code sets up the kernel high mapping: 247 * 248 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) 249 * 250 * phys_addr holds the negative offset to the kernel, which is added 251 * to the compile time generated pmds. This results in invalid pmds up 252 * to the point where we hit the physaddr 0 mapping. 253 * 254 * We limit the mappings to the region from _text to _end. _end is 255 * rounded up to the 2MB boundary. This catches the invalid pmds as 256 * well, as they are located before _text: 257 */ 258void __init cleanup_highmap(void) 259{ 260 unsigned long vaddr = __START_KERNEL_map; 261 unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1; 262 pmd_t *pmd = level2_kernel_pgt; 263 pmd_t *last_pmd = pmd + PTRS_PER_PMD; 264 265 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { 266 if (pmd_none(*pmd)) 267 continue; 268 if (vaddr < (unsigned long) _text || vaddr > end) 269 set_pmd(pmd, __pmd(0)); 270 } 271} 272 273static unsigned long __initdata table_start; 274static unsigned long __meminitdata table_end; 275static unsigned long __meminitdata table_top; 276 277static __meminit void *alloc_low_page(unsigned long *phys) 278{ 279 unsigned long pfn = table_end++; 280 void *adr; 281 282 if (after_bootmem) { 283 adr = (void *)get_zeroed_page(GFP_ATOMIC); 284 *phys = __pa(adr); 285 286 return adr; 287 } 288 289 if (pfn >= table_top) 290 panic("alloc_low_page: ran out of memory"); 291 292 adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); 293 memset(adr, 0, PAGE_SIZE); 294 *phys = pfn * PAGE_SIZE; 295 return adr; 296} 297 298static __meminit void unmap_low_page(void *adr) 299{ 300 if (after_bootmem) 301 return; 302 303 early_iounmap(adr, PAGE_SIZE); 304} 305 306static unsigned long __meminit 307phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end) 308{ 309 unsigned pages = 0; 310 unsigned long last_map_addr = end; 311 int i; 312 313 pte_t *pte = pte_page + pte_index(addr); 314 315 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { 316 317 if (addr >= end) { 318 if (!after_bootmem) { 319 for(; i < PTRS_PER_PTE; i++, pte++) 320 set_pte(pte, __pte(0)); 321 } 322 break; 323 } 324 325 if (pte_val(*pte)) 326 continue; 327 328 if (0) 329 printk(" pte=%p addr=%lx pte=%016lx\n", 330 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); 331 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL)); 332 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; 333 pages++; 334 } 335 update_page_count(PG_LEVEL_4K, pages); 336 337 return last_map_addr; 338} 339 340static unsigned long __meminit 341phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end) 342{ 343 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); 344 345 return phys_pte_init(pte, address, end); 346} 347 348static unsigned long __meminit 349phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, 350 unsigned long page_size_mask) 351{ 352 unsigned long pages = 0; 353 unsigned long last_map_addr = end; 354 355 int i = pmd_index(address); 356 357 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { 358 unsigned long pte_phys; 359 pmd_t *pmd = pmd_page + pmd_index(address); 360 pte_t *pte; 361 362 if (address >= end) { 363 if (!after_bootmem) { 364 for (; i < PTRS_PER_PMD; i++, pmd++) 365 set_pmd(pmd, __pmd(0)); 366 } 367 break; 368 } 369 370 if (pmd_val(*pmd)) { 371 if (!pmd_large(*pmd)) 372 last_map_addr = phys_pte_update(pmd, address, 373 end); 374 continue; 375 } 376 377 if (page_size_mask & (1<<PG_LEVEL_2M)) { 378 pages++; 379 set_pte((pte_t *)pmd, 380 pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); 381 last_map_addr = (address & PMD_MASK) + PMD_SIZE; 382 continue; 383 } 384 385 pte = alloc_low_page(&pte_phys); 386 last_map_addr = phys_pte_init(pte, address, end); 387 unmap_low_page(pte); 388 389 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); 390 } 391 update_page_count(PG_LEVEL_2M, pages); 392 return last_map_addr; 393} 394 395static unsigned long __meminit 396phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end, 397 unsigned long page_size_mask) 398{ 399 pmd_t *pmd = pmd_offset(pud, 0); 400 unsigned long last_map_addr; 401 402 spin_lock(&init_mm.page_table_lock); 403 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask); 404 spin_unlock(&init_mm.page_table_lock); 405 __flush_tlb_all(); 406 return last_map_addr; 407} 408 409static unsigned long __meminit 410phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, 411 unsigned long page_size_mask) 412{ 413 unsigned long pages = 0; 414 unsigned long last_map_addr = end; 415 int i = pud_index(addr); 416 417 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { 418 unsigned long pmd_phys; 419 pud_t *pud = pud_page + pud_index(addr); 420 pmd_t *pmd; 421 422 if (addr >= end) 423 break; 424 425 if (!after_bootmem && 426 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { 427 set_pud(pud, __pud(0)); 428 continue; 429 } 430 431 if (pud_val(*pud)) { 432 if (!pud_large(*pud)) 433 last_map_addr = phys_pmd_update(pud, addr, end, 434 page_size_mask); 435 continue; 436 } 437 438 if (page_size_mask & (1<<PG_LEVEL_1G)) { 439 pages++; 440 set_pte((pte_t *)pud, 441 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); 442 last_map_addr = (addr & PUD_MASK) + PUD_SIZE; 443 continue; 444 } 445 446 pmd = alloc_low_page(&pmd_phys); 447 448 spin_lock(&init_mm.page_table_lock); 449 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask); 450 unmap_low_page(pmd); 451 pud_populate(&init_mm, pud, __va(pmd_phys)); 452 spin_unlock(&init_mm.page_table_lock); 453 454 } 455 __flush_tlb_all(); 456 update_page_count(PG_LEVEL_1G, pages); 457 458 return last_map_addr; 459} 460 461static unsigned long __meminit 462phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, 463 unsigned long page_size_mask) 464{ 465 pud_t *pud; 466 467 pud = (pud_t *)pgd_page_vaddr(*pgd); 468 469 return phys_pud_init(pud, addr, end, page_size_mask); 470} 471 472static void __init find_early_table_space(unsigned long end) 473{ 474 unsigned long puds, pmds, ptes, tables, start; 475 476 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; 477 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); 478 if (direct_gbpages) { 479 unsigned long extra; 480 extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); 481 pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; 482 } else 483 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; 484 tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); 485 486 if (cpu_has_pse) { 487 unsigned long extra; 488 extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); 489 ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; 490 } else 491 ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; 492 tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE); 493 494 /* 495 * RED-PEN putting page tables only on node 0 could 496 * cause a hotspot and fill up ZONE_DMA. The page tables 497 * need roughly 0.5KB per GB. 498 */ 499 start = 0x8000; 500 table_start = find_e820_area(start, end, tables, PAGE_SIZE); 501 if (table_start == -1UL) 502 panic("Cannot find space for the kernel page tables"); 503 504 table_start >>= PAGE_SHIFT; 505 table_end = table_start; 506 table_top = table_start + (tables >> PAGE_SHIFT); 507 508 printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", 509 end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); 510} 511 512static void __init init_gbpages(void) 513{ 514 if (direct_gbpages && cpu_has_gbpages) 515 printk(KERN_INFO "Using GB pages for direct mapping\n"); 516 else 517 direct_gbpages = 0; 518} 519 520#ifdef CONFIG_MEMTEST 521 522static void __init memtest(unsigned long start_phys, unsigned long size, 523 unsigned pattern) 524{ 525 unsigned long i; 526 unsigned long *start; 527 unsigned long start_bad; 528 unsigned long last_bad; 529 unsigned long val; 530 unsigned long start_phys_aligned; 531 unsigned long count; 532 unsigned long incr; 533 534 switch (pattern) { 535 case 0: 536 val = 0UL; 537 break; 538 case 1: 539 val = -1UL; 540 break; 541 case 2: 542 val = 0x5555555555555555UL; 543 break; 544 case 3: 545 val = 0xaaaaaaaaaaaaaaaaUL; 546 break; 547 default: 548 return; 549 } 550 551 incr = sizeof(unsigned long); 552 start_phys_aligned = ALIGN(start_phys, incr); 553 count = (size - (start_phys_aligned - start_phys))/incr; 554 start = __va(start_phys_aligned); 555 start_bad = 0; 556 last_bad = 0; 557 558 for (i = 0; i < count; i++) 559 start[i] = val; 560 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { 561 if (*start != val) { 562 if (start_phys_aligned == last_bad + incr) { 563 last_bad += incr; 564 } else { 565 if (start_bad) { 566 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", 567 val, start_bad, last_bad + incr); 568 reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); 569 } 570 start_bad = last_bad = start_phys_aligned; 571 } 572 } 573 } 574 if (start_bad) { 575 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", 576 val, start_bad, last_bad + incr); 577 reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); 578 } 579 580} 581 582/* default is disabled */ 583static int memtest_pattern __initdata; 584 585static int __init parse_memtest(char *arg) 586{ 587 if (arg) 588 memtest_pattern = simple_strtoul(arg, NULL, 0); 589 return 0; 590} 591 592early_param("memtest", parse_memtest); 593 594static void __init early_memtest(unsigned long start, unsigned long end) 595{ 596 u64 t_start, t_size; 597 unsigned pattern; 598 599 if (!memtest_pattern) 600 return; 601 602 printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); 603 for (pattern = 0; pattern < memtest_pattern; pattern++) { 604 t_start = start; 605 t_size = 0; 606 while (t_start < end) { 607 t_start = find_e820_area_size(t_start, &t_size, 1); 608 609 /* done ? */ 610 if (t_start >= end) 611 break; 612 if (t_start + t_size > end) 613 t_size = end - t_start; 614 615 printk(KERN_CONT "\n %016llx - %016llx pattern %d", 616 (unsigned long long)t_start, 617 (unsigned long long)t_start + t_size, pattern); 618 619 memtest(t_start, t_size, pattern); 620 621 t_start += t_size; 622 } 623 } 624 printk(KERN_CONT "\n"); 625} 626#else 627static void __init early_memtest(unsigned long start, unsigned long end) 628{ 629} 630#endif 631 632static unsigned long __init kernel_physical_mapping_init(unsigned long start, 633 unsigned long end, 634 unsigned long page_size_mask) 635{ 636 637 unsigned long next, last_map_addr = end; 638 639 start = (unsigned long)__va(start); 640 end = (unsigned long)__va(end); 641 642 for (; start < end; start = next) { 643 pgd_t *pgd = pgd_offset_k(start); 644 unsigned long pud_phys; 645 pud_t *pud; 646 647 next = (start + PGDIR_SIZE) & PGDIR_MASK; 648 if (next > end) 649 next = end; 650 651 if (pgd_val(*pgd)) { 652 last_map_addr = phys_pud_update(pgd, __pa(start), 653 __pa(end), page_size_mask); 654 continue; 655 } 656 657 if (after_bootmem) 658 pud = pud_offset(pgd, start & PGDIR_MASK); 659 else 660 pud = alloc_low_page(&pud_phys); 661 662 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), 663 page_size_mask); 664 unmap_low_page(pud); 665 pgd_populate(&init_mm, pgd_offset_k(start), 666 __va(pud_phys)); 667 } 668 669 return last_map_addr; 670} 671 672struct map_range { 673 unsigned long start; 674 unsigned long end; 675 unsigned page_size_mask; 676}; 677 678#define NR_RANGE_MR 5 679 680static int save_mr(struct map_range *mr, int nr_range, 681 unsigned long start_pfn, unsigned long end_pfn, 682 unsigned long page_size_mask) 683{ 684 685 if (start_pfn < end_pfn) { 686 if (nr_range >= NR_RANGE_MR) 687 panic("run out of range for init_memory_mapping\n"); 688 mr[nr_range].start = start_pfn<<PAGE_SHIFT; 689 mr[nr_range].end = end_pfn<<PAGE_SHIFT; 690 mr[nr_range].page_size_mask = page_size_mask; 691 nr_range++; 692 } 693 694 return nr_range; 695} 696 697/* 698 * Setup the direct mapping of the physical memory at PAGE_OFFSET. 699 * This runs before bootmem is initialized and gets pages directly from 700 * the physical memory. To access them they are temporarily mapped. 701 */ 702unsigned long __init_refok init_memory_mapping(unsigned long start, 703 unsigned long end) 704{ 705 unsigned long last_map_addr = 0; 706 unsigned long page_size_mask = 0; 707 unsigned long start_pfn, end_pfn; 708 709 struct map_range mr[NR_RANGE_MR]; 710 int nr_range, i; 711 712 printk(KERN_INFO "init_memory_mapping\n"); 713 714 /* 715 * Find space for the kernel direct mapping tables. 716 * 717 * Later we should allocate these tables in the local node of the 718 * memory mapped. Unfortunately this is done currently before the 719 * nodes are discovered. 720 */ 721 if (!after_bootmem) 722 init_gbpages(); 723 724 if (direct_gbpages) 725 page_size_mask |= 1 << PG_LEVEL_1G; 726 if (cpu_has_pse) 727 page_size_mask |= 1 << PG_LEVEL_2M; 728 729 memset(mr, 0, sizeof(mr)); 730 nr_range = 0; 731 732 /* head if not big page alignment ?*/ 733 start_pfn = start >> PAGE_SHIFT; 734 end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT) 735 << (PMD_SHIFT - PAGE_SHIFT); 736 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 737 738 /* big page (2M) range*/ 739 start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) 740 << (PMD_SHIFT - PAGE_SHIFT); 741 end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT) 742 << (PUD_SHIFT - PAGE_SHIFT); 743 if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT))) 744 end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)); 745 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 746 page_size_mask & (1<<PG_LEVEL_2M)); 747 748 /* big page (1G) range */ 749 start_pfn = end_pfn; 750 end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); 751 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 752 page_size_mask & 753 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); 754 755 /* tail is not big page (1G) alignment */ 756 start_pfn = end_pfn; 757 end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); 758 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 759 page_size_mask & (1<<PG_LEVEL_2M)); 760 761 /* tail is not big page (2M) alignment */ 762 start_pfn = end_pfn; 763 end_pfn = end>>PAGE_SHIFT; 764 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 765 766 /* try to merge same page size and continuous */ 767 for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { 768 unsigned long old_start; 769 if (mr[i].end != mr[i+1].start || 770 mr[i].page_size_mask != mr[i+1].page_size_mask) 771 continue; 772 /* move it */ 773 old_start = mr[i].start; 774 memmove(&mr[i], &mr[i+1], 775 (nr_range - 1 - i) * sizeof (struct map_range)); 776 mr[i].start = old_start; 777 nr_range--; 778 } 779 780 for (i = 0; i < nr_range; i++) 781 printk(KERN_DEBUG " %010lx - %010lx page %s\n", 782 mr[i].start, mr[i].end, 783 (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( 784 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); 785 786 if (!after_bootmem) 787 find_early_table_space(end); 788 789 for (i = 0; i < nr_range; i++) 790 last_map_addr = kernel_physical_mapping_init( 791 mr[i].start, mr[i].end, 792 mr[i].page_size_mask); 793 794 if (!after_bootmem) 795 mmu_cr4_features = read_cr4(); 796 __flush_tlb_all(); 797 798 if (!after_bootmem && table_end > table_start) 799 reserve_early(table_start << PAGE_SHIFT, 800 table_end << PAGE_SHIFT, "PGTABLE"); 801 802 printk(KERN_INFO "last_map_addr: %lx end: %lx\n", 803 last_map_addr, end); 804 805 if (!after_bootmem) 806 early_memtest(start, end); 807 808 return last_map_addr >> PAGE_SHIFT; 809} 810 811#ifndef CONFIG_NUMA 812void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) 813{ 814 unsigned long bootmap_size, bootmap; 815 816 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; 817 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, 818 PAGE_SIZE); 819 if (bootmap == -1L) 820 panic("Cannot find bootmem map of size %ld\n", bootmap_size); 821 /* don't touch min_low_pfn */ 822 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, 823 0, end_pfn); 824 e820_register_active_regions(0, start_pfn, end_pfn); 825 free_bootmem_with_active_regions(0, end_pfn); 826 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); 827 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); 828} 829 830void __init paging_init(void) 831{ 832 unsigned long max_zone_pfns[MAX_NR_ZONES]; 833 834 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 835 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; 836 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; 837 max_zone_pfns[ZONE_NORMAL] = max_pfn; 838 839 memory_present(0, 0, max_pfn); 840 sparse_init(); 841 free_area_init_nodes(max_zone_pfns); 842} 843#endif 844 845/* 846 * Memory hotplug specific functions 847 */ 848#ifdef CONFIG_MEMORY_HOTPLUG 849/* 850 * Memory is added always to NORMAL zone. This means you will never get 851 * additional DMA/DMA32 memory. 852 */ 853int arch_add_memory(int nid, u64 start, u64 size) 854{ 855 struct pglist_data *pgdat = NODE_DATA(nid); 856 struct zone *zone = pgdat->node_zones + ZONE_NORMAL; 857 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; 858 unsigned long nr_pages = size >> PAGE_SHIFT; 859 int ret; 860 861 last_mapped_pfn = init_memory_mapping(start, start + size-1); 862 if (last_mapped_pfn > max_pfn_mapped) 863 max_pfn_mapped = last_mapped_pfn; 864 865 ret = __add_pages(zone, start_pfn, nr_pages); 866 WARN_ON(1); 867 868 return ret; 869} 870EXPORT_SYMBOL_GPL(arch_add_memory); 871 872#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) 873int memory_add_physaddr_to_nid(u64 start) 874{ 875 return 0; 876} 877EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 878#endif 879 880#endif /* CONFIG_MEMORY_HOTPLUG */ 881 882/* 883 * devmem_is_allowed() checks to see if /dev/mem access to a certain address 884 * is valid. The argument is a physical page number. 885 * 886 * 887 * On x86, access has to be given to the first megabyte of ram because that area 888 * contains bios code and data regions used by X and dosemu and similar apps. 889 * Access has to be given to non-kernel-ram areas as well, these contain the PCI 890 * mmio resources as well as potential bios/acpi data regions. 891 */ 892int devmem_is_allowed(unsigned long pagenr) 893{ 894 if (pagenr <= 256) 895 return 1; 896 if (!page_is_ram(pagenr)) 897 return 1; 898 return 0; 899} 900 901 902static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, 903 kcore_modules, kcore_vsyscall; 904 905void __init mem_init(void) 906{ 907 long codesize, reservedpages, datasize, initsize; 908 909 pci_iommu_alloc(); 910 911 /* clear_bss() already clear the empty_zero_page */ 912 913 reservedpages = 0; 914 915 /* this will put all low memory onto the freelists */ 916#ifdef CONFIG_NUMA 917 totalram_pages = numa_free_all_bootmem(); 918#else 919 totalram_pages = free_all_bootmem(); 920#endif 921 reservedpages = max_pfn - totalram_pages - 922 absent_pages_in_range(0, max_pfn); 923 after_bootmem = 1; 924 925 codesize = (unsigned long) &_etext - (unsigned long) &_text; 926 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 927 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 928 929 /* Register memory areas for /proc/kcore */ 930 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 931 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 932 VMALLOC_END-VMALLOC_START); 933 kclist_add(&kcore_kernel, &_stext, _end - _stext); 934 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); 935 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, 936 VSYSCALL_END - VSYSCALL_START); 937 938 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 939 "%ldk reserved, %ldk data, %ldk init)\n", 940 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 941 max_pfn << (PAGE_SHIFT-10), 942 codesize >> 10, 943 reservedpages << (PAGE_SHIFT-10), 944 datasize >> 10, 945 initsize >> 10); 946 947 cpa_init(); 948} 949 950void free_init_pages(char *what, unsigned long begin, unsigned long end) 951{ 952 unsigned long addr = begin; 953 954 if (addr >= end) 955 return; 956 957 /* 958 * If debugging page accesses then do not free this memory but 959 * mark them not present - any buggy init-section access will 960 * create a kernel page fault: 961 */ 962#ifdef CONFIG_DEBUG_PAGEALLOC 963 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", 964 begin, PAGE_ALIGN(end)); 965 set_memory_np(begin, (end - begin) >> PAGE_SHIFT); 966#else 967 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); 968 969 for (; addr < end; addr += PAGE_SIZE) { 970 ClearPageReserved(virt_to_page(addr)); 971 init_page_count(virt_to_page(addr)); 972 memset((void *)(addr & ~(PAGE_SIZE-1)), 973 POISON_FREE_INITMEM, PAGE_SIZE); 974 free_page(addr); 975 totalram_pages++; 976 } 977#endif 978} 979 980void free_initmem(void) 981{ 982 free_init_pages("unused kernel memory", 983 (unsigned long)(&__init_begin), 984 (unsigned long)(&__init_end)); 985} 986 987#ifdef CONFIG_DEBUG_RODATA 988const int rodata_test_data = 0xC3; 989EXPORT_SYMBOL_GPL(rodata_test_data); 990 991void mark_rodata_ro(void) 992{ 993 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); 994 unsigned long rodata_start = 995 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; 996 997#ifdef CONFIG_DYNAMIC_FTRACE 998 /* Dynamic tracing modifies the kernel text section */ 999 start = rodata_start; 1000#endif 1001 1002 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", 1003 (end - start) >> 10); 1004 set_memory_ro(start, (end - start) >> PAGE_SHIFT); 1005 1006 /* 1007 * The rodata section (but not the kernel text!) should also be 1008 * not-executable. 1009 */ 1010 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); 1011 1012 rodata_test(); 1013 1014#ifdef CONFIG_CPA_DEBUG 1015 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); 1016 set_memory_rw(start, (end-start) >> PAGE_SHIFT); 1017 1018 printk(KERN_INFO "Testing CPA: again\n"); 1019 set_memory_ro(start, (end-start) >> PAGE_SHIFT); 1020#endif 1021} 1022 1023#endif 1024 1025#ifdef CONFIG_BLK_DEV_INITRD 1026void free_initrd_mem(unsigned long start, unsigned long end) 1027{ 1028 free_init_pages("initrd memory", start, end); 1029} 1030#endif 1031 1032int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, 1033 int flags) 1034{ 1035#ifdef CONFIG_NUMA 1036 int nid, next_nid; 1037 int ret; 1038#endif 1039 unsigned long pfn = phys >> PAGE_SHIFT; 1040 1041 if (pfn >= max_pfn) { 1042 /* 1043 * This can happen with kdump kernels when accessing 1044 * firmware tables: 1045 */ 1046 if (pfn < max_pfn_mapped) 1047 return -EFAULT; 1048 1049 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", 1050 phys, len); 1051 return -EFAULT; 1052 } 1053 1054 /* Should check here against the e820 map to avoid double free */ 1055#ifdef CONFIG_NUMA 1056 nid = phys_to_nid(phys); 1057 next_nid = phys_to_nid(phys + len - 1); 1058 if (nid == next_nid) 1059 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); 1060 else 1061 ret = reserve_bootmem(phys, len, flags); 1062 1063 if (ret != 0) 1064 return ret; 1065 1066#else 1067 reserve_bootmem(phys, len, BOOTMEM_DEFAULT); 1068#endif 1069 1070 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { 1071 dma_reserve += len / PAGE_SIZE; 1072 set_dma_reserve(dma_reserve); 1073 } 1074 1075 return 0; 1076} 1077 1078int kern_addr_valid(unsigned long addr) 1079{ 1080 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; 1081 pgd_t *pgd; 1082 pud_t *pud; 1083 pmd_t *pmd; 1084 pte_t *pte; 1085 1086 if (above != 0 && above != -1UL) 1087 return 0; 1088 1089 pgd = pgd_offset_k(addr); 1090 if (pgd_none(*pgd)) 1091 return 0; 1092 1093 pud = pud_offset(pgd, addr); 1094 if (pud_none(*pud)) 1095 return 0; 1096 1097 pmd = pmd_offset(pud, addr); 1098 if (pmd_none(*pmd)) 1099 return 0; 1100 1101 if (pmd_large(*pmd)) 1102 return pfn_valid(pmd_pfn(*pmd)); 1103 1104 pte = pte_offset_kernel(pmd, addr); 1105 if (pte_none(*pte)) 1106 return 0; 1107 1108 return pfn_valid(pte_pfn(*pte)); 1109} 1110 1111/* 1112 * A pseudo VMA to allow ptrace access for the vsyscall page. This only 1113 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does 1114 * not need special handling anymore: 1115 */ 1116static struct vm_area_struct gate_vma = { 1117 .vm_start = VSYSCALL_START, 1118 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), 1119 .vm_page_prot = PAGE_READONLY_EXEC, 1120 .vm_flags = VM_READ | VM_EXEC 1121}; 1122 1123struct vm_area_struct *get_gate_vma(struct task_struct *tsk) 1124{ 1125#ifdef CONFIG_IA32_EMULATION 1126 if (test_tsk_thread_flag(tsk, TIF_IA32)) 1127 return NULL; 1128#endif 1129 return &gate_vma; 1130} 1131 1132int in_gate_area(struct task_struct *task, unsigned long addr) 1133{ 1134 struct vm_area_struct *vma = get_gate_vma(task); 1135 1136 if (!vma) 1137 return 0; 1138 1139 return (addr >= vma->vm_start) && (addr < vma->vm_end); 1140} 1141 1142/* 1143 * Use this when you have no reliable task/vma, typically from interrupt 1144 * context. It is less reliable than using the task's vma and may give 1145 * false positives: 1146 */ 1147int in_gate_area_no_task(unsigned long addr) 1148{ 1149 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); 1150} 1151 1152const char *arch_vma_name(struct vm_area_struct *vma) 1153{ 1154 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) 1155 return "[vdso]"; 1156 if (vma == &gate_vma) 1157 return "[vsyscall]"; 1158 return NULL; 1159} 1160 1161#ifdef CONFIG_SPARSEMEM_VMEMMAP 1162/* 1163 * Initialise the sparsemem vmemmap using huge-pages at the PMD level. 1164 */ 1165static long __meminitdata addr_start, addr_end; 1166static void __meminitdata *p_start, *p_end; 1167static int __meminitdata node_start; 1168 1169int __meminit 1170vmemmap_populate(struct page *start_page, unsigned long size, int node) 1171{ 1172 unsigned long addr = (unsigned long)start_page; 1173 unsigned long end = (unsigned long)(start_page + size); 1174 unsigned long next; 1175 pgd_t *pgd; 1176 pud_t *pud; 1177 pmd_t *pmd; 1178 1179 for (; addr < end; addr = next) { 1180 void *p = NULL; 1181 1182 pgd = vmemmap_pgd_populate(addr, node); 1183 if (!pgd) 1184 return -ENOMEM; 1185 1186 pud = vmemmap_pud_populate(pgd, addr, node); 1187 if (!pud) 1188 return -ENOMEM; 1189 1190 if (!cpu_has_pse) { 1191 next = (addr + PAGE_SIZE) & PAGE_MASK; 1192 pmd = vmemmap_pmd_populate(pud, addr, node); 1193 1194 if (!pmd) 1195 return -ENOMEM; 1196 1197 p = vmemmap_pte_populate(pmd, addr, node); 1198 1199 if (!p) 1200 return -ENOMEM; 1201 1202 addr_end = addr + PAGE_SIZE; 1203 p_end = p + PAGE_SIZE; 1204 } else { 1205 next = pmd_addr_end(addr, end); 1206 1207 pmd = pmd_offset(pud, addr); 1208 if (pmd_none(*pmd)) { 1209 pte_t entry; 1210 1211 p = vmemmap_alloc_block(PMD_SIZE, node); 1212 if (!p) 1213 return -ENOMEM; 1214 1215 entry = pfn_pte(__pa(p) >> PAGE_SHIFT, 1216 PAGE_KERNEL_LARGE); 1217 set_pmd(pmd, __pmd(pte_val(entry))); 1218 1219 /* check to see if we have contiguous blocks */ 1220 if (p_end != p || node_start != node) { 1221 if (p_start) 1222 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", 1223 addr_start, addr_end-1, p_start, p_end-1, node_start); 1224 addr_start = addr; 1225 node_start = node; 1226 p_start = p; 1227 } 1228 1229 addr_end = addr + PMD_SIZE; 1230 p_end = p + PMD_SIZE; 1231 } else 1232 vmemmap_verify((pte_t *)pmd, node, addr, next); 1233 } 1234 1235 } 1236 return 0; 1237} 1238 1239void __meminit vmemmap_populate_print_last(void) 1240{ 1241 if (p_start) { 1242 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", 1243 addr_start, addr_end-1, p_start, p_end-1, node_start); 1244 p_start = NULL; 1245 p_end = NULL; 1246 node_start = 0; 1247 } 1248} 1249#endif 1250