init_64.c revision b27a43c1e90582facad44de67d02bc9e9f900289
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 unsigned long __meminit 274phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, 275 pgprot_t prot) 276{ 277 unsigned pages = 0; 278 unsigned long last_map_addr = end; 279 int i; 280 281 pte_t *pte = pte_page + pte_index(addr); 282 283 for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { 284 285 if (addr >= end) { 286 if (!after_bootmem) { 287 for(; i < PTRS_PER_PTE; i++, pte++) 288 set_pte(pte, __pte(0)); 289 } 290 break; 291 } 292 293 /* 294 * We will re-use the existing mapping. 295 * Xen for example has some special requirements, like mapping 296 * pagetable pages as RO. So assume someone who pre-setup 297 * these mappings are more intelligent. 298 */ 299 if (pte_val(*pte)) 300 continue; 301 302 if (0) 303 printk(" pte=%p addr=%lx pte=%016lx\n", 304 pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); 305 pages++; 306 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); 307 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; 308 } 309 310 update_page_count(PG_LEVEL_4K, pages); 311 312 return last_map_addr; 313} 314 315static unsigned long __meminit 316phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end, 317 pgprot_t prot) 318{ 319 pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); 320 321 return phys_pte_init(pte, address, end, prot); 322} 323 324static unsigned long __meminit 325phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, 326 unsigned long page_size_mask, pgprot_t prot) 327{ 328 unsigned long pages = 0; 329 unsigned long last_map_addr = end; 330 331 int i = pmd_index(address); 332 333 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { 334 unsigned long pte_phys; 335 pmd_t *pmd = pmd_page + pmd_index(address); 336 pte_t *pte; 337 pgprot_t new_prot = prot; 338 339 if (address >= end) { 340 if (!after_bootmem) { 341 for (; i < PTRS_PER_PMD; i++, pmd++) 342 set_pmd(pmd, __pmd(0)); 343 } 344 break; 345 } 346 347 if (pmd_val(*pmd)) { 348 if (!pmd_large(*pmd)) { 349 spin_lock(&init_mm.page_table_lock); 350 last_map_addr = phys_pte_update(pmd, address, 351 end, prot); 352 spin_unlock(&init_mm.page_table_lock); 353 continue; 354 } 355 /* 356 * If we are ok with PG_LEVEL_2M mapping, then we will 357 * use the existing mapping, 358 * 359 * Otherwise, we will split the large page mapping but 360 * use the same existing protection bits except for 361 * large page, so that we don't violate Intel's TLB 362 * Application note (317080) which says, while changing 363 * the page sizes, new and old translations should 364 * not differ with respect to page frame and 365 * attributes. 366 */ 367 if (page_size_mask & (1 << PG_LEVEL_2M)) 368 continue; 369 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); 370 } 371 372 if (page_size_mask & (1<<PG_LEVEL_2M)) { 373 pages++; 374 spin_lock(&init_mm.page_table_lock); 375 set_pte((pte_t *)pmd, 376 pfn_pte(address >> PAGE_SHIFT, 377 __pgprot(pgprot_val(prot) | _PAGE_PSE))); 378 spin_unlock(&init_mm.page_table_lock); 379 last_map_addr = (address & PMD_MASK) + PMD_SIZE; 380 continue; 381 } 382 383 pte = alloc_low_page(&pte_phys); 384 last_map_addr = phys_pte_init(pte, address, end, new_prot); 385 unmap_low_page(pte); 386 387 spin_lock(&init_mm.page_table_lock); 388 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); 389 spin_unlock(&init_mm.page_table_lock); 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, pgprot_t prot) 398{ 399 pmd_t *pmd = pmd_offset(pud, 0); 400 unsigned long last_map_addr; 401 402 last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot); 403 __flush_tlb_all(); 404 return last_map_addr; 405} 406 407static unsigned long __meminit 408phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, 409 unsigned long page_size_mask) 410{ 411 unsigned long pages = 0; 412 unsigned long last_map_addr = end; 413 int i = pud_index(addr); 414 415 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { 416 unsigned long pmd_phys; 417 pud_t *pud = pud_page + pud_index(addr); 418 pmd_t *pmd; 419 pgprot_t prot = PAGE_KERNEL; 420 421 if (addr >= end) 422 break; 423 424 if (!after_bootmem && 425 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { 426 set_pud(pud, __pud(0)); 427 continue; 428 } 429 430 if (pud_val(*pud)) { 431 if (!pud_large(*pud)) { 432 last_map_addr = phys_pmd_update(pud, addr, end, 433 page_size_mask, prot); 434 continue; 435 } 436 /* 437 * If we are ok with PG_LEVEL_1G mapping, then we will 438 * use the existing mapping. 439 * 440 * Otherwise, we will split the gbpage mapping but use 441 * the same existing protection bits except for large 442 * page, so that we don't violate Intel's TLB 443 * Application note (317080) which says, while changing 444 * the page sizes, new and old translations should 445 * not differ with respect to page frame and 446 * attributes. 447 */ 448 if (page_size_mask & (1 << PG_LEVEL_1G)) 449 continue; 450 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); 451 } 452 453 if (page_size_mask & (1<<PG_LEVEL_1G)) { 454 pages++; 455 spin_lock(&init_mm.page_table_lock); 456 set_pte((pte_t *)pud, 457 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); 458 spin_unlock(&init_mm.page_table_lock); 459 last_map_addr = (addr & PUD_MASK) + PUD_SIZE; 460 continue; 461 } 462 463 pmd = alloc_low_page(&pmd_phys); 464 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, 465 prot); 466 unmap_low_page(pmd); 467 468 spin_lock(&init_mm.page_table_lock); 469 pud_populate(&init_mm, pud, __va(pmd_phys)); 470 spin_unlock(&init_mm.page_table_lock); 471 } 472 __flush_tlb_all(); 473 474 update_page_count(PG_LEVEL_1G, pages); 475 476 return last_map_addr; 477} 478 479static unsigned long __meminit 480phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, 481 unsigned long page_size_mask) 482{ 483 pud_t *pud; 484 485 pud = (pud_t *)pgd_page_vaddr(*pgd); 486 487 return phys_pud_init(pud, addr, end, page_size_mask); 488} 489 490static void __init find_early_table_space(unsigned long end, int use_pse, 491 int use_gbpages) 492{ 493 unsigned long puds, pmds, ptes, tables, start; 494 495 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; 496 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); 497 if (use_gbpages) { 498 unsigned long extra; 499 extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); 500 pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; 501 } else 502 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; 503 tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); 504 505 if (use_pse) { 506 unsigned long extra; 507 extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); 508 ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; 509 } else 510 ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; 511 tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE); 512 513 /* 514 * RED-PEN putting page tables only on node 0 could 515 * cause a hotspot and fill up ZONE_DMA. The page tables 516 * need roughly 0.5KB per GB. 517 */ 518 start = 0x8000; 519 table_start = find_e820_area(start, end, tables, PAGE_SIZE); 520 if (table_start == -1UL) 521 panic("Cannot find space for the kernel page tables"); 522 523 table_start >>= PAGE_SHIFT; 524 table_end = table_start; 525 table_top = table_start + (tables >> PAGE_SHIFT); 526 527 printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", 528 end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); 529} 530 531static void __init init_gbpages(void) 532{ 533 if (direct_gbpages && cpu_has_gbpages) 534 printk(KERN_INFO "Using GB pages for direct mapping\n"); 535 else 536 direct_gbpages = 0; 537} 538 539static unsigned long __init kernel_physical_mapping_init(unsigned long start, 540 unsigned long end, 541 unsigned long page_size_mask) 542{ 543 544 unsigned long next, last_map_addr = end; 545 546 start = (unsigned long)__va(start); 547 end = (unsigned long)__va(end); 548 549 for (; start < end; start = next) { 550 pgd_t *pgd = pgd_offset_k(start); 551 unsigned long pud_phys; 552 pud_t *pud; 553 554 next = (start + PGDIR_SIZE) & PGDIR_MASK; 555 if (next > end) 556 next = end; 557 558 if (pgd_val(*pgd)) { 559 last_map_addr = phys_pud_update(pgd, __pa(start), 560 __pa(end), page_size_mask); 561 continue; 562 } 563 564 pud = alloc_low_page(&pud_phys); 565 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), 566 page_size_mask); 567 unmap_low_page(pud); 568 569 spin_lock(&init_mm.page_table_lock); 570 pgd_populate(&init_mm, pgd, __va(pud_phys)); 571 spin_unlock(&init_mm.page_table_lock); 572 } 573 __flush_tlb_all(); 574 575 return last_map_addr; 576} 577 578struct map_range { 579 unsigned long start; 580 unsigned long end; 581 unsigned page_size_mask; 582}; 583 584#define NR_RANGE_MR 5 585 586static int save_mr(struct map_range *mr, int nr_range, 587 unsigned long start_pfn, unsigned long end_pfn, 588 unsigned long page_size_mask) 589{ 590 591 if (start_pfn < end_pfn) { 592 if (nr_range >= NR_RANGE_MR) 593 panic("run out of range for init_memory_mapping\n"); 594 mr[nr_range].start = start_pfn<<PAGE_SHIFT; 595 mr[nr_range].end = end_pfn<<PAGE_SHIFT; 596 mr[nr_range].page_size_mask = page_size_mask; 597 nr_range++; 598 } 599 600 return nr_range; 601} 602 603/* 604 * Setup the direct mapping of the physical memory at PAGE_OFFSET. 605 * This runs before bootmem is initialized and gets pages directly from 606 * the physical memory. To access them they are temporarily mapped. 607 */ 608unsigned long __init_refok init_memory_mapping(unsigned long start, 609 unsigned long end) 610{ 611 unsigned long last_map_addr = 0; 612 unsigned long page_size_mask = 0; 613 unsigned long start_pfn, end_pfn; 614 615 struct map_range mr[NR_RANGE_MR]; 616 int nr_range, i; 617 int use_pse, use_gbpages; 618 619 printk(KERN_INFO "init_memory_mapping\n"); 620 621 /* 622 * Find space for the kernel direct mapping tables. 623 * 624 * Later we should allocate these tables in the local node of the 625 * memory mapped. Unfortunately this is done currently before the 626 * nodes are discovered. 627 */ 628 if (!after_bootmem) 629 init_gbpages(); 630 631#ifdef CONFIG_DEBUG_PAGEALLOC 632 /* 633 * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. 634 * This will simplify cpa(), which otherwise needs to support splitting 635 * large pages into small in interrupt context, etc. 636 */ 637 use_pse = use_gbpages = 0; 638#else 639 use_pse = cpu_has_pse; 640 use_gbpages = direct_gbpages; 641#endif 642 643 if (use_gbpages) 644 page_size_mask |= 1 << PG_LEVEL_1G; 645 if (use_pse) 646 page_size_mask |= 1 << PG_LEVEL_2M; 647 648 memset(mr, 0, sizeof(mr)); 649 nr_range = 0; 650 651 /* head if not big page alignment ?*/ 652 start_pfn = start >> PAGE_SHIFT; 653 end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT) 654 << (PMD_SHIFT - PAGE_SHIFT); 655 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 656 657 /* big page (2M) range*/ 658 start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) 659 << (PMD_SHIFT - PAGE_SHIFT); 660 end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT) 661 << (PUD_SHIFT - PAGE_SHIFT); 662 if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT))) 663 end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)); 664 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 665 page_size_mask & (1<<PG_LEVEL_2M)); 666 667 /* big page (1G) range */ 668 start_pfn = end_pfn; 669 end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); 670 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 671 page_size_mask & 672 ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); 673 674 /* tail is not big page (1G) alignment */ 675 start_pfn = end_pfn; 676 end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); 677 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 678 page_size_mask & (1<<PG_LEVEL_2M)); 679 680 /* tail is not big page (2M) alignment */ 681 start_pfn = end_pfn; 682 end_pfn = end>>PAGE_SHIFT; 683 nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); 684 685 /* try to merge same page size and continuous */ 686 for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { 687 unsigned long old_start; 688 if (mr[i].end != mr[i+1].start || 689 mr[i].page_size_mask != mr[i+1].page_size_mask) 690 continue; 691 /* move it */ 692 old_start = mr[i].start; 693 memmove(&mr[i], &mr[i+1], 694 (nr_range - 1 - i) * sizeof (struct map_range)); 695 mr[i].start = old_start; 696 nr_range--; 697 } 698 699 for (i = 0; i < nr_range; i++) 700 printk(KERN_DEBUG " %010lx - %010lx page %s\n", 701 mr[i].start, mr[i].end, 702 (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( 703 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); 704 705 if (!after_bootmem) 706 find_early_table_space(end, use_pse, use_gbpages); 707 708 for (i = 0; i < nr_range; i++) 709 last_map_addr = kernel_physical_mapping_init( 710 mr[i].start, mr[i].end, 711 mr[i].page_size_mask); 712 713 if (!after_bootmem) 714 mmu_cr4_features = read_cr4(); 715 __flush_tlb_all(); 716 717 if (!after_bootmem && table_end > table_start) 718 reserve_early(table_start << PAGE_SHIFT, 719 table_end << PAGE_SHIFT, "PGTABLE"); 720 721 printk(KERN_INFO "last_map_addr: %lx end: %lx\n", 722 last_map_addr, end); 723 724 if (!after_bootmem) 725 early_memtest(start, end); 726 727 return last_map_addr >> PAGE_SHIFT; 728} 729 730#ifndef CONFIG_NUMA 731void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) 732{ 733 unsigned long bootmap_size, bootmap; 734 735 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; 736 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, 737 PAGE_SIZE); 738 if (bootmap == -1L) 739 panic("Cannot find bootmem map of size %ld\n", bootmap_size); 740 /* don't touch min_low_pfn */ 741 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, 742 0, end_pfn); 743 e820_register_active_regions(0, start_pfn, end_pfn); 744 free_bootmem_with_active_regions(0, end_pfn); 745 early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); 746 reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); 747} 748 749void __init paging_init(void) 750{ 751 unsigned long max_zone_pfns[MAX_NR_ZONES]; 752 753 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 754 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; 755 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; 756 max_zone_pfns[ZONE_NORMAL] = max_pfn; 757 758 memory_present(0, 0, max_pfn); 759 sparse_init(); 760 free_area_init_nodes(max_zone_pfns); 761} 762#endif 763 764/* 765 * Memory hotplug specific functions 766 */ 767#ifdef CONFIG_MEMORY_HOTPLUG 768/* 769 * Memory is added always to NORMAL zone. This means you will never get 770 * additional DMA/DMA32 memory. 771 */ 772int arch_add_memory(int nid, u64 start, u64 size) 773{ 774 struct pglist_data *pgdat = NODE_DATA(nid); 775 struct zone *zone = pgdat->node_zones + ZONE_NORMAL; 776 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; 777 unsigned long nr_pages = size >> PAGE_SHIFT; 778 int ret; 779 780 last_mapped_pfn = init_memory_mapping(start, start + size-1); 781 if (last_mapped_pfn > max_pfn_mapped) 782 max_pfn_mapped = last_mapped_pfn; 783 784 ret = __add_pages(zone, start_pfn, nr_pages); 785 WARN_ON(1); 786 787 return ret; 788} 789EXPORT_SYMBOL_GPL(arch_add_memory); 790 791#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) 792int memory_add_physaddr_to_nid(u64 start) 793{ 794 return 0; 795} 796EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 797#endif 798 799#endif /* CONFIG_MEMORY_HOTPLUG */ 800 801/* 802 * devmem_is_allowed() checks to see if /dev/mem access to a certain address 803 * is valid. The argument is a physical page number. 804 * 805 * 806 * On x86, access has to be given to the first megabyte of ram because that area 807 * contains bios code and data regions used by X and dosemu and similar apps. 808 * Access has to be given to non-kernel-ram areas as well, these contain the PCI 809 * mmio resources as well as potential bios/acpi data regions. 810 */ 811int devmem_is_allowed(unsigned long pagenr) 812{ 813 if (pagenr <= 256) 814 return 1; 815 if (!page_is_ram(pagenr)) 816 return 1; 817 return 0; 818} 819 820 821static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, 822 kcore_modules, kcore_vsyscall; 823 824void __init mem_init(void) 825{ 826 long codesize, reservedpages, datasize, initsize; 827 828 pci_iommu_alloc(); 829 830 /* clear_bss() already clear the empty_zero_page */ 831 832 reservedpages = 0; 833 834 /* this will put all low memory onto the freelists */ 835#ifdef CONFIG_NUMA 836 totalram_pages = numa_free_all_bootmem(); 837#else 838 totalram_pages = free_all_bootmem(); 839#endif 840 reservedpages = max_pfn - totalram_pages - 841 absent_pages_in_range(0, max_pfn); 842 after_bootmem = 1; 843 844 codesize = (unsigned long) &_etext - (unsigned long) &_text; 845 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 846 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 847 848 /* Register memory areas for /proc/kcore */ 849 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 850 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 851 VMALLOC_END-VMALLOC_START); 852 kclist_add(&kcore_kernel, &_stext, _end - _stext); 853 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); 854 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, 855 VSYSCALL_END - VSYSCALL_START); 856 857 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " 858 "%ldk reserved, %ldk data, %ldk init)\n", 859 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 860 max_pfn << (PAGE_SHIFT-10), 861 codesize >> 10, 862 reservedpages << (PAGE_SHIFT-10), 863 datasize >> 10, 864 initsize >> 10); 865} 866 867void free_init_pages(char *what, unsigned long begin, unsigned long end) 868{ 869 unsigned long addr = begin; 870 871 if (addr >= end) 872 return; 873 874 /* 875 * If debugging page accesses then do not free this memory but 876 * mark them not present - any buggy init-section access will 877 * create a kernel page fault: 878 */ 879#ifdef CONFIG_DEBUG_PAGEALLOC 880 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", 881 begin, PAGE_ALIGN(end)); 882 set_memory_np(begin, (end - begin) >> PAGE_SHIFT); 883#else 884 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); 885 886 for (; addr < end; addr += PAGE_SIZE) { 887 ClearPageReserved(virt_to_page(addr)); 888 init_page_count(virt_to_page(addr)); 889 memset((void *)(addr & ~(PAGE_SIZE-1)), 890 POISON_FREE_INITMEM, PAGE_SIZE); 891 free_page(addr); 892 totalram_pages++; 893 } 894#endif 895} 896 897void free_initmem(void) 898{ 899 free_init_pages("unused kernel memory", 900 (unsigned long)(&__init_begin), 901 (unsigned long)(&__init_end)); 902} 903 904#ifdef CONFIG_DEBUG_RODATA 905const int rodata_test_data = 0xC3; 906EXPORT_SYMBOL_GPL(rodata_test_data); 907 908void mark_rodata_ro(void) 909{ 910 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); 911 unsigned long rodata_start = 912 ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; 913 914#ifdef CONFIG_DYNAMIC_FTRACE 915 /* Dynamic tracing modifies the kernel text section */ 916 start = rodata_start; 917#endif 918 919 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", 920 (end - start) >> 10); 921 set_memory_ro(start, (end - start) >> PAGE_SHIFT); 922 923 /* 924 * The rodata section (but not the kernel text!) should also be 925 * not-executable. 926 */ 927 set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); 928 929 rodata_test(); 930 931#ifdef CONFIG_CPA_DEBUG 932 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); 933 set_memory_rw(start, (end-start) >> PAGE_SHIFT); 934 935 printk(KERN_INFO "Testing CPA: again\n"); 936 set_memory_ro(start, (end-start) >> PAGE_SHIFT); 937#endif 938} 939 940#endif 941 942#ifdef CONFIG_BLK_DEV_INITRD 943void free_initrd_mem(unsigned long start, unsigned long end) 944{ 945 free_init_pages("initrd memory", start, end); 946} 947#endif 948 949int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, 950 int flags) 951{ 952#ifdef CONFIG_NUMA 953 int nid, next_nid; 954 int ret; 955#endif 956 unsigned long pfn = phys >> PAGE_SHIFT; 957 958 if (pfn >= max_pfn) { 959 /* 960 * This can happen with kdump kernels when accessing 961 * firmware tables: 962 */ 963 if (pfn < max_pfn_mapped) 964 return -EFAULT; 965 966 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", 967 phys, len); 968 return -EFAULT; 969 } 970 971 /* Should check here against the e820 map to avoid double free */ 972#ifdef CONFIG_NUMA 973 nid = phys_to_nid(phys); 974 next_nid = phys_to_nid(phys + len - 1); 975 if (nid == next_nid) 976 ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); 977 else 978 ret = reserve_bootmem(phys, len, flags); 979 980 if (ret != 0) 981 return ret; 982 983#else 984 reserve_bootmem(phys, len, BOOTMEM_DEFAULT); 985#endif 986 987 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { 988 dma_reserve += len / PAGE_SIZE; 989 set_dma_reserve(dma_reserve); 990 } 991 992 return 0; 993} 994 995int kern_addr_valid(unsigned long addr) 996{ 997 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; 998 pgd_t *pgd; 999 pud_t *pud; 1000 pmd_t *pmd; 1001 pte_t *pte; 1002 1003 if (above != 0 && above != -1UL) 1004 return 0; 1005 1006 pgd = pgd_offset_k(addr); 1007 if (pgd_none(*pgd)) 1008 return 0; 1009 1010 pud = pud_offset(pgd, addr); 1011 if (pud_none(*pud)) 1012 return 0; 1013 1014 pmd = pmd_offset(pud, addr); 1015 if (pmd_none(*pmd)) 1016 return 0; 1017 1018 if (pmd_large(*pmd)) 1019 return pfn_valid(pmd_pfn(*pmd)); 1020 1021 pte = pte_offset_kernel(pmd, addr); 1022 if (pte_none(*pte)) 1023 return 0; 1024 1025 return pfn_valid(pte_pfn(*pte)); 1026} 1027 1028/* 1029 * A pseudo VMA to allow ptrace access for the vsyscall page. This only 1030 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does 1031 * not need special handling anymore: 1032 */ 1033static struct vm_area_struct gate_vma = { 1034 .vm_start = VSYSCALL_START, 1035 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), 1036 .vm_page_prot = PAGE_READONLY_EXEC, 1037 .vm_flags = VM_READ | VM_EXEC 1038}; 1039 1040struct vm_area_struct *get_gate_vma(struct task_struct *tsk) 1041{ 1042#ifdef CONFIG_IA32_EMULATION 1043 if (test_tsk_thread_flag(tsk, TIF_IA32)) 1044 return NULL; 1045#endif 1046 return &gate_vma; 1047} 1048 1049int in_gate_area(struct task_struct *task, unsigned long addr) 1050{ 1051 struct vm_area_struct *vma = get_gate_vma(task); 1052 1053 if (!vma) 1054 return 0; 1055 1056 return (addr >= vma->vm_start) && (addr < vma->vm_end); 1057} 1058 1059/* 1060 * Use this when you have no reliable task/vma, typically from interrupt 1061 * context. It is less reliable than using the task's vma and may give 1062 * false positives: 1063 */ 1064int in_gate_area_no_task(unsigned long addr) 1065{ 1066 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); 1067} 1068 1069const char *arch_vma_name(struct vm_area_struct *vma) 1070{ 1071 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) 1072 return "[vdso]"; 1073 if (vma == &gate_vma) 1074 return "[vsyscall]"; 1075 return NULL; 1076} 1077 1078#ifdef CONFIG_SPARSEMEM_VMEMMAP 1079/* 1080 * Initialise the sparsemem vmemmap using huge-pages at the PMD level. 1081 */ 1082static long __meminitdata addr_start, addr_end; 1083static void __meminitdata *p_start, *p_end; 1084static int __meminitdata node_start; 1085 1086int __meminit 1087vmemmap_populate(struct page *start_page, unsigned long size, int node) 1088{ 1089 unsigned long addr = (unsigned long)start_page; 1090 unsigned long end = (unsigned long)(start_page + size); 1091 unsigned long next; 1092 pgd_t *pgd; 1093 pud_t *pud; 1094 pmd_t *pmd; 1095 1096 for (; addr < end; addr = next) { 1097 void *p = NULL; 1098 1099 pgd = vmemmap_pgd_populate(addr, node); 1100 if (!pgd) 1101 return -ENOMEM; 1102 1103 pud = vmemmap_pud_populate(pgd, addr, node); 1104 if (!pud) 1105 return -ENOMEM; 1106 1107 if (!cpu_has_pse) { 1108 next = (addr + PAGE_SIZE) & PAGE_MASK; 1109 pmd = vmemmap_pmd_populate(pud, addr, node); 1110 1111 if (!pmd) 1112 return -ENOMEM; 1113 1114 p = vmemmap_pte_populate(pmd, addr, node); 1115 1116 if (!p) 1117 return -ENOMEM; 1118 1119 addr_end = addr + PAGE_SIZE; 1120 p_end = p + PAGE_SIZE; 1121 } else { 1122 next = pmd_addr_end(addr, end); 1123 1124 pmd = pmd_offset(pud, addr); 1125 if (pmd_none(*pmd)) { 1126 pte_t entry; 1127 1128 p = vmemmap_alloc_block(PMD_SIZE, node); 1129 if (!p) 1130 return -ENOMEM; 1131 1132 entry = pfn_pte(__pa(p) >> PAGE_SHIFT, 1133 PAGE_KERNEL_LARGE); 1134 set_pmd(pmd, __pmd(pte_val(entry))); 1135 1136 /* check to see if we have contiguous blocks */ 1137 if (p_end != p || node_start != node) { 1138 if (p_start) 1139 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", 1140 addr_start, addr_end-1, p_start, p_end-1, node_start); 1141 addr_start = addr; 1142 node_start = node; 1143 p_start = p; 1144 } 1145 1146 addr_end = addr + PMD_SIZE; 1147 p_end = p + PMD_SIZE; 1148 } else 1149 vmemmap_verify((pte_t *)pmd, node, addr, next); 1150 } 1151 1152 } 1153 return 0; 1154} 1155 1156void __meminit vmemmap_populate_print_last(void) 1157{ 1158 if (p_start) { 1159 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", 1160 addr_start, addr_end-1, p_start, p_end-1, node_start); 1161 p_start = NULL; 1162 p_end = NULL; 1163 node_start = 0; 1164 } 1165} 1166#endif 1167