arch/x86/mm/init_64.c

   1 /*
   2  *  linux/arch/x86_64/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright (C) 2000  Pavel Machek <pavel@ucw.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/memblock.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/pci.h>
  27 #include <linux/pfn.h>
  28 #include <linux/poison.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/module.h>
  31 #include <linux/memory.h>
  32 #include <linux/memory_hotplug.h>
  33 #include <linux/nmi.h>
  34 #include <linux/gfp.h>
  35 #include <linux/kcore.h>
  36
  37 #include <asm/processor.h>
  38 #include <asm/bios_ebda.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/pgalloc.h>
  42 #include <asm/dma.h>
  43 #include <asm/fixmap.h>
  44 #include <asm/e820.h>
  45 #include <asm/apic.h>
  46 #include <asm/tlb.h>
  47 #include <asm/mmu_context.h>
  48 #include <asm/proto.h>
  49 #include <asm/smp.h>
  50 #include <asm/sections.h>
  51 #include <asm/kdebug.h>
  52 #include <asm/numa.h>
  53 #include <asm/cacheflush.h>
  54 #include <asm/init.h>
  55 #include <asm/uv/uv.h>
  56 #include <asm/setup.h>
  57
  58 #include "mm_internal.h"
  59
  60 static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page,
  61                            unsigned long addr, unsigned long end)
  62 {
  63         addr &= PMD_MASK;
  64         for (; addr < end; addr += PMD_SIZE) {
  65                 pmd_t *pmd = pmd_page + pmd_index(addr);
  66
  67                 if (!pmd_present(*pmd))
  68                         set_pmd(pmd, __pmd(addr | pmd_flag));
  69         }
  70 }
  71 static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
  72                           unsigned long addr, unsigned long end)
  73 {
  74         unsigned long next;
  75
  76         for (; addr < end; addr = next) {
  77                 pud_t *pud = pud_page + pud_index(addr);
  78                 pmd_t *pmd;
  79
  80                 next = (addr & PUD_MASK) + PUD_SIZE;
  81                 if (next > end)
  82                         next = end;
  83
  84                 if (pud_present(*pud)) {
  85                         pmd = pmd_offset(pud, 0);
  86                         ident_pmd_init(info->pmd_flag, pmd, addr, next);
  87                         continue;
  88                 }
  89                 pmd = (pmd_t *)info->alloc_pgt_page(info->context);
  90                 if (!pmd)
  91                         return -ENOMEM;
  92                 ident_pmd_init(info->pmd_flag, pmd, addr, next);
  93                 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
  94         }
  95
  96         return 0;
  97 }
  98
  99 int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
 100                               unsigned long addr, unsigned long end)
 101 {
 102         unsigned long next;
 103         int result;
 104         int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0;
 105
 106         for (; addr < end; addr = next) {
 107                 pgd_t *pgd = pgd_page + pgd_index(addr) + off;
 108                 pud_t *pud;
 109
 110                 next = (addr & PGDIR_MASK) + PGDIR_SIZE;
 111                 if (next > end)
 112                         next = end;
 113
 114                 if (pgd_present(*pgd)) {
 115                         pud = pud_offset(pgd, 0);
 116                         result = ident_pud_init(info, pud, addr, next);
 117                         if (result)
 118                                 return result;
 119                         continue;
 120                 }
 121
 122                 pud = (pud_t *)info->alloc_pgt_page(info->context);
 123                 if (!pud)
 124                         return -ENOMEM;
 125                 result = ident_pud_init(info, pud, addr, next);
 126                 if (result)
 127                         return result;
 128                 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int __init parse_direct_gbpages_off(char *arg)
 135 {
 136         direct_gbpages = 0;
 137         return 0;
 138 }
 139 early_param("nogbpages", parse_direct_gbpages_off);
 140
 141 static int __init parse_direct_gbpages_on(char *arg)
 142 {
 143         direct_gbpages = 1;
 144         return 0;
 145 }
 146 early_param("gbpages", parse_direct_gbpages_on);
 147
 148 /*
 149  * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
 150  * physical space so we can cache the place of the first one and move
 151  * around without checking the pgd every time.
 152  */
 153
 154 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
 155 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 156
 157 int force_personality32;
 158
 159 /*
 160  * noexec32=on|off
 161  * Control non executable heap for 32bit processes.
 162  * To control the stack too use noexec=off
 163  *
 164  * on   PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
 165  * off  PROT_READ implies PROT_EXEC
 166  */
 167 static int __init nonx32_setup(char *str)
 168 {
 169         if (!strcmp(str, "on"))
 170                 force_personality32 &= ~READ_IMPLIES_EXEC;
 171         else if (!strcmp(str, "off"))
 172                 force_personality32 |= READ_IMPLIES_EXEC;
 173         return 1;
 174 }
 175 __setup("noexec32=", nonx32_setup);
 176
 177 /*
 178  * When memory was added/removed make sure all the processes MM have
 179  * suitable PGD entries in the local PGD level page.
 180  */
 181 void sync_global_pgds(unsigned long start, unsigned long end)
 182 {
 183         unsigned long address;
 184
 185         for (address = start; address <= end; address += PGDIR_SIZE) {
 186                 const pgd_t *pgd_ref = pgd_offset_k(address);
 187                 struct page *page;
 188
 189                 if (pgd_none(*pgd_ref))
 190                         continue;
 191
 192                 spin_lock(&pgd_lock);
 193                 list_for_each_entry(page, &pgd_list, lru) {
 194                         pgd_t *pgd;
 195                         spinlock_t *pgt_lock;
 196
 197                         pgd = (pgd_t *)page_address(page) + pgd_index(address);
 198                         /* the pgt_lock only for Xen */
 199                         pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
 200                         spin_lock(pgt_lock);
 201
 202                         if (pgd_none(*pgd))
 203                                 set_pgd(pgd, *pgd_ref);
 204                         else
 205                                 BUG_ON(pgd_page_vaddr(*pgd)
 206                                        != pgd_page_vaddr(*pgd_ref));
 207
 208                         spin_unlock(pgt_lock);
 209                 }
 210                 spin_unlock(&pgd_lock);
 211         }
 212 }
 213
 214 /*
 215  * NOTE: This function is marked __ref because it calls __init function
 216  * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
 217  */
 218 static __ref void *spp_getpage(void)
 219 {
 220         void *ptr;
 221
 222         if (after_bootmem)
 223                 ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
 224         else
 225                 ptr = alloc_bootmem_pages(PAGE_SIZE);
 226
 227         if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
 228                 panic("set_pte_phys: cannot allocate page data %s\n",
 229                         after_bootmem ? "after bootmem" : "");
 230         }
 231
 232         pr_debug("spp_getpage %p\n", ptr);
 233
 234         return ptr;
 235 }
 236
 237 static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
 238 {
 239         if (pgd_none(*pgd)) {
 240                 pud_t *pud = (pud_t *)spp_getpage();
 241                 pgd_populate(&init_mm, pgd, pud);
 242                 if (pud != pud_offset(pgd, 0))
 243                         printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
 244                                pud, pud_offset(pgd, 0));
 245         }
 246         return pud_offset(pgd, vaddr);
 247 }
 248
 249 static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
 250 {
 251         if (pud_none(*pud)) {
 252                 pmd_t *pmd = (pmd_t *) spp_getpage();
 253                 pud_populate(&init_mm, pud, pmd);
 254                 if (pmd != pmd_offset(pud, 0))
 255                         printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
 256                                pmd, pmd_offset(pud, 0));
 257         }
 258         return pmd_offset(pud, vaddr);
 259 }
 260
 261 static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
 262 {
 263         if (pmd_none(*pmd)) {
 264                 pte_t *pte = (pte_t *) spp_getpage();
 265                 pmd_populate_kernel(&init_mm, pmd, pte);
 266                 if (pte != pte_offset_kernel(pmd, 0))
 267                         printk(KERN_ERR "PAGETABLE BUG #02!\n");
 268         }
 269         return pte_offset_kernel(pmd, vaddr);
 270 }
 271
 272 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
 273 {
 274         pud_t *pud;
 275         pmd_t *pmd;
 276         pte_t *pte;
 277
 278         pud = pud_page + pud_index(vaddr);
 279         pmd = fill_pmd(pud, vaddr);
 280         pte = fill_pte(pmd, vaddr);
 281
 282         set_pte(pte, new_pte);
 283
 284         /*
 285          * It's enough to flush this one mapping.
 286          * (PGE mappings get flushed as well)
 287          */
 288         __flush_tlb_one(vaddr);
 289 }
 290
 291 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 292 {
 293         pgd_t *pgd;
 294         pud_t *pud_page;
 295
 296         pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
 297
 298         pgd = pgd_offset_k(vaddr);
 299         if (pgd_none(*pgd)) {
 300                 printk(KERN_ERR
 301                         "PGD FIXMAP MISSING, it should be setup in head.S!\n");
 302                 return;
 303         }
 304         pud_page = (pud_t*)pgd_page_vaddr(*pgd);
 305         set_pte_vaddr_pud(pud_page, vaddr, pteval);
 306 }
 307
 308 pmd_t * __init populate_extra_pmd(unsigned long vaddr)
 309 {
 310         pgd_t *pgd;
 311         pud_t *pud;
 312
 313         pgd = pgd_offset_k(vaddr);
 314         pud = fill_pud(pgd, vaddr);
 315         return fill_pmd(pud, vaddr);
 316 }
 317
 318 pte_t * __init populate_extra_pte(unsigned long vaddr)
 319 {
 320         pmd_t *pmd;
 321
 322         pmd = populate_extra_pmd(vaddr);
 323         return fill_pte(pmd, vaddr);
 324 }
 325
 326 /*
 327  * Create large page table mappings for a range of physical addresses.
 328  */
 329 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
 330                                                 pgprot_t prot)
 331 {
 332         pgd_t *pgd;
 333         pud_t *pud;
 334         pmd_t *pmd;
 335
 336         BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
 337         for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
 338                 pgd = pgd_offset_k((unsigned long)__va(phys));
 339                 if (pgd_none(*pgd)) {
 340                         pud = (pud_t *) spp_getpage();
 341                         set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
 342                                                 _PAGE_USER));
 343                 }
 344                 pud = pud_offset(pgd, (unsigned long)__va(phys));
 345                 if (pud_none(*pud)) {
 346                         pmd = (pmd_t *) spp_getpage();
 347                         set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
 348                                                 _PAGE_USER));
 349                 }
 350                 pmd = pmd_offset(pud, phys);
 351                 BUG_ON(!pmd_none(*pmd));
 352                 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
 353         }
 354 }
 355
 356 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
 357 {
 358         __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
 359 }
 360
 361 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
 362 {
 363         __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
 364 }
 365
 366 /*
 367  * The head.S code sets up the kernel high mapping:
 368  *
 369  *   from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
 370  *
 371  * phys_base holds the negative offset to the kernel, which is added
 372  * to the compile time generated pmds. This results in invalid pmds up
 373  * to the point where we hit the physaddr 0 mapping.
 374  *
 375  * We limit the mappings to the region from _text to _brk_end.  _brk_end
 376  * is rounded up to the 2MB boundary. This catches the invalid pmds as
 377  * well, as they are located before _text:
 378  */
 379 void __init cleanup_highmap(void)
 380 {
 381         unsigned long vaddr = __START_KERNEL_map;
 382         unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
 383         unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
 384         pmd_t *pmd = level2_kernel_pgt;
 385
 386         /*
 387          * Native path, max_pfn_mapped is not set yet.
 388          * Xen has valid max_pfn_mapped set in
 389          *      arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
 390          */
 391         if (max_pfn_mapped)
 392                 vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
 393
 394         for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
 395                 if (pmd_none(*pmd))
 396                         continue;
 397                 if (vaddr < (unsigned long) _text || vaddr > end)
 398                         set_pmd(pmd, __pmd(0));
 399         }
 400 }
 401
 402 static unsigned long __meminit
 403 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
 404               pgprot_t prot)
 405 {
 406         unsigned long pages = 0, next;
 407         unsigned long last_map_addr = end;
 408         int i;
 409
 410         pte_t *pte = pte_page + pte_index(addr);
 411
 412         for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) {
 413                 next = (addr & PAGE_MASK) + PAGE_SIZE;
 414                 if (addr >= end) {
 415                         if (!after_bootmem &&
 416                             !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) &&
 417                             !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN))
 418                                 set_pte(pte, __pte(0));
 419                         continue;
 420                 }
 421
 422                 /*
 423                  * We will re-use the existing mapping.
 424                  * Xen for example has some special requirements, like mapping
 425                  * pagetable pages as RO. So assume someone who pre-setup
 426                  * these mappings are more intelligent.
 427                  */
 428                 if (pte_val(*pte)) {
 429                         if (!after_bootmem)
 430                                 pages++;
 431                         continue;
 432                 }
 433
 434                 if (0)
 435                         printk("   pte=%p addr=%lx pte=%016lx\n",
 436                                pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
 437                 pages++;
 438                 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
 439                 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
 440         }
 441
 442         update_page_count(PG_LEVEL_4K, pages);
 443
 444         return last_map_addr;
 445 }
 446
 447 static unsigned long __meminit
 448 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
 449               unsigned long page_size_mask, pgprot_t prot)
 450 {
 451         unsigned long pages = 0, next;
 452         unsigned long last_map_addr = end;
 453
 454         int i = pmd_index(address);
 455
 456         for (; i < PTRS_PER_PMD; i++, address = next) {
 457                 pmd_t *pmd = pmd_page + pmd_index(address);
 458                 pte_t *pte;
 459                 pgprot_t new_prot = prot;
 460
 461                 next = (address & PMD_MASK) + PMD_SIZE;
 462                 if (address >= end) {
 463                         if (!after_bootmem &&
 464                             !e820_any_mapped(address & PMD_MASK, next, E820_RAM) &&
 465                             !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN))
 466                                 set_pmd(pmd, __pmd(0));
 467                         continue;
 468                 }
 469
 470                 if (pmd_val(*pmd)) {
 471                         if (!pmd_large(*pmd)) {
 472                                 spin_lock(&init_mm.page_table_lock);
 473                                 pte = (pte_t *)pmd_page_vaddr(*pmd);
 474                                 last_map_addr = phys_pte_init(pte, address,
 475                                                                 end, prot);
 476                                 spin_unlock(&init_mm.page_table_lock);
 477                                 continue;
 478                         }
 479                         /*
 480                          * If we are ok with PG_LEVEL_2M mapping, then we will
 481                          * use the existing mapping,
 482                          *
 483                          * Otherwise, we will split the large page mapping but
 484                          * use the same existing protection bits except for
 485                          * large page, so that we don't violate Intel's TLB
 486                          * Application note (317080) which says, while changing
 487                          * the page sizes, new and old translations should
 488                          * not differ with respect to page frame and
 489                          * attributes.
 490                          */
 491                         if (page_size_mask & (1 << PG_LEVEL_2M)) {
 492                                 if (!after_bootmem)
 493                                         pages++;
 494                                 last_map_addr = next;
 495                                 continue;
 496                         }
 497                         new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
 498                 }
 499
 500                 if (page_size_mask & (1<<PG_LEVEL_2M)) {
 501                         pages++;
 502                         spin_lock(&init_mm.page_table_lock);
 503                         set_pte((pte_t *)pmd,
 504                                 pfn_pte((address & PMD_MASK) >> PAGE_SHIFT,
 505                                         __pgprot(pgprot_val(prot) | _PAGE_PSE)));
 506                         spin_unlock(&init_mm.page_table_lock);
 507                         last_map_addr = next;
 508                         continue;
 509                 }
 510
 511                 pte = alloc_low_page();
 512                 last_map_addr = phys_pte_init(pte, address, end, new_prot);
 513
 514                 spin_lock(&init_mm.page_table_lock);
 515                 pmd_populate_kernel(&init_mm, pmd, pte);
 516                 spin_unlock(&init_mm.page_table_lock);
 517         }
 518         update_page_count(PG_LEVEL_2M, pages);
 519         return last_map_addr;
 520 }
 521
 522 static unsigned long __meminit
 523 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
 524                          unsigned long page_size_mask)
 525 {
 526         unsigned long pages = 0, next;
 527         unsigned long last_map_addr = end;
 528         int i = pud_index(addr);
 529
 530         for (; i < PTRS_PER_PUD; i++, addr = next) {
 531                 pud_t *pud = pud_page + pud_index(addr);
 532                 pmd_t *pmd;
 533                 pgprot_t prot = PAGE_KERNEL;
 534
 535                 next = (addr & PUD_MASK) + PUD_SIZE;
 536                 if (addr >= end) {
 537                         if (!after_bootmem &&
 538                             !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) &&
 539                             !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN))
 540                                 set_pud(pud, __pud(0));
 541                         continue;
 542                 }
 543
 544                 if (pud_val(*pud)) {
 545                         if (!pud_large(*pud)) {
 546                                 pmd = pmd_offset(pud, 0);
 547                                 last_map_addr = phys_pmd_init(pmd, addr, end,
 548                                                          page_size_mask, prot);
 549                                 __flush_tlb_all();
 550                                 continue;
 551                         }
 552                         /*
 553                          * If we are ok with PG_LEVEL_1G mapping, then we will
 554                          * use the existing mapping.
 555                          *
 556                          * Otherwise, we will split the gbpage mapping but use
 557                          * the same existing protection  bits except for large
 558                          * page, so that we don't violate Intel's TLB
 559                          * Application note (317080) which says, while changing
 560                          * the page sizes, new and old translations should
 561                          * not differ with respect to page frame and
 562                          * attributes.
 563                          */
 564                         if (page_size_mask & (1 << PG_LEVEL_1G)) {
 565                                 if (!after_bootmem)
 566                                         pages++;
 567                                 last_map_addr = next;
 568                                 continue;
 569                         }
 570                         prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
 571                 }
 572
 573                 if (page_size_mask & (1<<PG_LEVEL_1G)) {
 574                         pages++;
 575                         spin_lock(&init_mm.page_table_lock);
 576                         set_pte((pte_t *)pud,
 577                                 pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT,
 578                                         PAGE_KERNEL_LARGE));
 579                         spin_unlock(&init_mm.page_table_lock);
 580                         last_map_addr = next;
 581                         continue;
 582                 }
 583
 584                 pmd = alloc_low_page();
 585                 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
 586                                               prot);
 587
 588                 spin_lock(&init_mm.page_table_lock);
 589                 pud_populate(&init_mm, pud, pmd);
 590                 spin_unlock(&init_mm.page_table_lock);
 591         }
 592         __flush_tlb_all();
 593
 594         update_page_count(PG_LEVEL_1G, pages);
 595
 596         return last_map_addr;
 597 }
 598
 599 unsigned long __meminit
 600 kernel_physical_mapping_init(unsigned long start,
 601                              unsigned long end,
 602                              unsigned long page_size_mask)
 603 {
 604         bool pgd_changed = false;
 605         unsigned long next, last_map_addr = end;
 606         unsigned long addr;
 607
 608         start = (unsigned long)__va(start);
 609         end = (unsigned long)__va(end);
 610         addr = start;
 611
 612         for (; start < end; start = next) {
 613                 pgd_t *pgd = pgd_offset_k(start);
 614                 pud_t *pud;
 615
 616                 next = (start & PGDIR_MASK) + PGDIR_SIZE;
 617
 618                 if (pgd_val(*pgd)) {
 619                         pud = (pud_t *)pgd_page_vaddr(*pgd);
 620                         last_map_addr = phys_pud_init(pud, __pa(start),
 621                                                  __pa(end), page_size_mask);
 622                         continue;
 623                 }
 624
 625                 pud = alloc_low_page();
 626                 last_map_addr = phys_pud_init(pud, __pa(start), __pa(end),
 627                                                  page_size_mask);
 628
 629                 spin_lock(&init_mm.page_table_lock);
 630                 pgd_populate(&init_mm, pgd, pud);
 631                 spin_unlock(&init_mm.page_table_lock);
 632                 pgd_changed = true;
 633         }
 634
 635         if (pgd_changed)
 636                 sync_global_pgds(addr, end - 1);
 637
 638         __flush_tlb_all();
 639
 640         return last_map_addr;
 641 }
 642
 643 #ifndef CONFIG_NUMA
 644 void __init initmem_init(void)
 645 {
 646         memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
 647 }
 648 #endif
 649
 650 void __init paging_init(void)
 651 {
 652         sparse_memory_present_with_active_regions(MAX_NUMNODES);
 653         sparse_init();
 654
 655         /*
 656          * clear the default setting with node 0
 657          * note: don't use nodes_clear here, that is really clearing when
 658          *       numa support is not compiled in, and later node_set_state
 659          *       will not set it back.
 660          */
 661         node_clear_state(0, N_MEMORY);
 662         if (N_MEMORY != N_NORMAL_MEMORY)
 663                 node_clear_state(0, N_NORMAL_MEMORY);
 664
 665         zone_sizes_init();
 666 }
 667
 668 /*
 669  * Memory hotplug specific functions
 670  */
 671 #ifdef CONFIG_MEMORY_HOTPLUG
 672 /*
 673  * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
 674  * updating.
 675  */
 676 static void  update_end_of_memory_vars(u64 start, u64 size)
 677 {
 678         unsigned long end_pfn = PFN_UP(start + size);
 679
 680         if (end_pfn > max_pfn) {
 681                 max_pfn = end_pfn;
 682                 max_low_pfn = end_pfn;
 683                 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 684         }
 685 }
 686
 687 /*
 688  * Memory is added always to NORMAL zone. This means you will never get
 689  * additional DMA/DMA32 memory.
 690  */
 691 int arch_add_memory(int nid, u64 start, u64 size)
 692 {
 693         struct pglist_data *pgdat = NODE_DATA(nid);
 694         struct zone *zone = pgdat->node_zones +
 695                 zone_for_memory(nid, start, size, ZONE_NORMAL);
 696         unsigned long start_pfn = start >> PAGE_SHIFT;
 697         unsigned long nr_pages = size >> PAGE_SHIFT;
 698         int ret;
 699
 700         init_memory_mapping(start, start + size);
 701
 702         ret = __add_pages(nid, zone, start_pfn, nr_pages);
 703         WARN_ON_ONCE(ret);
 704
 705         /* update max_pfn, max_low_pfn and high_memory */
 706         update_end_of_memory_vars(start, size);
 707
 708         return ret;
 709 }
 710 EXPORT_SYMBOL_GPL(arch_add_memory);
 711
 712 #define PAGE_INUSE 0xFD
 713
 714 static void __meminit free_pagetable(struct page *page, int order)
 715 {
 716         unsigned long magic;
 717         unsigned int nr_pages = 1 << order;
 718
 719         /* bootmem page has reserved flag */
 720         if (PageReserved(page)) {
 721                 __ClearPageReserved(page);
 722
 723                 magic = (unsigned long)page->lru.next;
 724                 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
 725                         while (nr_pages--)
 726                                 put_page_bootmem(page++);
 727                 } else
 728                         while (nr_pages--)
 729                                 free_reserved_page(page++);
 730         } else
 731                 free_pages((unsigned long)page_address(page), order);
 732 }
 733
 734 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
 735 {
 736         pte_t *pte;
 737         int i;
 738
 739         for (i = 0; i < PTRS_PER_PTE; i++) {
 740                 pte = pte_start + i;
 741                 if (pte_val(*pte))
 742                         return;
 743         }
 744
 745         /* free a pte talbe */
 746         free_pagetable(pmd_page(*pmd), 0);
 747         spin_lock(&init_mm.page_table_lock);
 748         pmd_clear(pmd);
 749         spin_unlock(&init_mm.page_table_lock);
 750 }
 751
 752 static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
 753 {
 754         pmd_t *pmd;
 755         int i;
 756
 757         for (i = 0; i < PTRS_PER_PMD; i++) {
 758                 pmd = pmd_start + i;
 759                 if (pmd_val(*pmd))
 760                         return;
 761         }
 762
 763         /* free a pmd talbe */
 764         free_pagetable(pud_page(*pud), 0);
 765         spin_lock(&init_mm.page_table_lock);
 766         pud_clear(pud);
 767         spin_unlock(&init_mm.page_table_lock);
 768 }
 769
 770 /* Return true if pgd is changed, otherwise return false. */
 771 static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd)
 772 {
 773         pud_t *pud;
 774         int i;
 775
 776         for (i = 0; i < PTRS_PER_PUD; i++) {
 777                 pud = pud_start + i;
 778                 if (pud_val(*pud))
 779                         return false;
 780         }
 781
 782         /* free a pud table */
 783         free_pagetable(pgd_page(*pgd), 0);
 784         spin_lock(&init_mm.page_table_lock);
 785         pgd_clear(pgd);
 786         spin_unlock(&init_mm.page_table_lock);
 787
 788         return true;
 789 }
 790
 791 static void __meminit
 792 remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
 793                  bool direct)
 794 {
 795         unsigned long next, pages = 0;
 796         pte_t *pte;
 797         void *page_addr;
 798         phys_addr_t phys_addr;
 799
 800         pte = pte_start + pte_index(addr);
 801         for (; addr < end; addr = next, pte++) {
 802                 next = (addr + PAGE_SIZE) & PAGE_MASK;
 803                 if (next > end)
 804                         next = end;
 805
 806                 if (!pte_present(*pte))
 807                         continue;
 808
 809                 /*
 810                  * We mapped [0,1G) memory as identity mapping when
 811                  * initializing, in arch/x86/kernel/head_64.S. These
 812                  * pagetables cannot be removed.
 813                  */
 814                 phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
 815                 if (phys_addr < (phys_addr_t)0x40000000)
 816                         return;
 817
 818                 if (IS_ALIGNED(addr, PAGE_SIZE) &&
 819                     IS_ALIGNED(next, PAGE_SIZE)) {
 820                         /*
 821                          * Do not free direct mapping pages since they were
 822                          * freed when offlining, or simplely not in use.
 823                          */
 824                         if (!direct)
 825                                 free_pagetable(pte_page(*pte), 0);
 826
 827                         spin_lock(&init_mm.page_table_lock);
 828                         pte_clear(&init_mm, addr, pte);
 829                         spin_unlock(&init_mm.page_table_lock);
 830
 831                         /* For non-direct mapping, pages means nothing. */
 832                         pages++;
 833                 } else {
 834                         /*
 835                          * If we are here, we are freeing vmemmap pages since
 836                          * direct mapped memory ranges to be freed are aligned.
 837                          *
 838                          * If we are not removing the whole page, it means
 839                          * other page structs in this page are being used and
 840                          * we canot remove them. So fill the unused page_structs
 841                          * with 0xFD, and remove the page when it is wholly
 842                          * filled with 0xFD.
 843                          */
 844                         memset((void *)addr, PAGE_INUSE, next - addr);
 845
 846                         page_addr = page_address(pte_page(*pte));
 847                         if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
 848                                 free_pagetable(pte_page(*pte), 0);
 849
 850                                 spin_lock(&init_mm.page_table_lock);
 851                                 pte_clear(&init_mm, addr, pte);
 852                                 spin_unlock(&init_mm.page_table_lock);
 853                         }
 854                 }
 855         }
 856
 857         /* Call free_pte_table() in remove_pmd_table(). */
 858         flush_tlb_all();
 859         if (direct)
 860                 update_page_count(PG_LEVEL_4K, -pages);
 861 }
 862
 863 static void __meminit
 864 remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
 865                  bool direct)
 866 {
 867         unsigned long next, pages = 0;
 868         pte_t *pte_base;
 869         pmd_t *pmd;
 870         void *page_addr;
 871
 872         pmd = pmd_start + pmd_index(addr);
 873         for (; addr < end; addr = next, pmd++) {
 874                 next = pmd_addr_end(addr, end);
 875
 876                 if (!pmd_present(*pmd))
 877                         continue;
 878
 879                 if (pmd_large(*pmd)) {
 880                         if (IS_ALIGNED(addr, PMD_SIZE) &&
 881                             IS_ALIGNED(next, PMD_SIZE)) {
 882                                 if (!direct)
 883                                         free_pagetable(pmd_page(*pmd),
 884                                                        get_order(PMD_SIZE));
 885
 886                                 spin_lock(&init_mm.page_table_lock);
 887                                 pmd_clear(pmd);
 888                                 spin_unlock(&init_mm.page_table_lock);
 889                                 pages++;
 890                         } else {
 891                                 /* If here, we are freeing vmemmap pages. */
 892                                 memset((void *)addr, PAGE_INUSE, next - addr);
 893
 894                                 page_addr = page_address(pmd_page(*pmd));
 895                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 896                                                 PMD_SIZE)) {
 897                                         free_pagetable(pmd_page(*pmd),
 898                                                        get_order(PMD_SIZE));
 899
 900                                         spin_lock(&init_mm.page_table_lock);
 901                                         pmd_clear(pmd);
 902                                         spin_unlock(&init_mm.page_table_lock);
 903                                 }
 904                         }
 905
 906                         continue;
 907                 }
 908
 909                 pte_base = (pte_t *)pmd_page_vaddr(*pmd);
 910                 remove_pte_table(pte_base, addr, next, direct);
 911                 free_pte_table(pte_base, pmd);
 912         }
 913
 914         /* Call free_pmd_table() in remove_pud_table(). */
 915         if (direct)
 916                 update_page_count(PG_LEVEL_2M, -pages);
 917 }
 918
 919 static void __meminit
 920 remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
 921                  bool direct)
 922 {
 923         unsigned long next, pages = 0;
 924         pmd_t *pmd_base;
 925         pud_t *pud;
 926         void *page_addr;
 927
 928         pud = pud_start + pud_index(addr);
 929         for (; addr < end; addr = next, pud++) {
 930                 next = pud_addr_end(addr, end);
 931
 932                 if (!pud_present(*pud))
 933                         continue;
 934
 935                 if (pud_large(*pud)) {
 936                         if (IS_ALIGNED(addr, PUD_SIZE) &&
 937                             IS_ALIGNED(next, PUD_SIZE)) {
 938                                 if (!direct)
 939                                         free_pagetable(pud_page(*pud),
 940                                                        get_order(PUD_SIZE));
 941
 942                                 spin_lock(&init_mm.page_table_lock);
 943                                 pud_clear(pud);
 944                                 spin_unlock(&init_mm.page_table_lock);
 945                                 pages++;
 946                         } else {
 947                                 /* If here, we are freeing vmemmap pages. */
 948                                 memset((void *)addr, PAGE_INUSE, next - addr);
 949
 950                                 page_addr = page_address(pud_page(*pud));
 951                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 952                                                 PUD_SIZE)) {
 953                                         free_pagetable(pud_page(*pud),
 954                                                        get_order(PUD_SIZE));
 955
 956                                         spin_lock(&init_mm.page_table_lock);
 957                                         pud_clear(pud);
 958                                         spin_unlock(&init_mm.page_table_lock);
 959                                 }
 960                         }
 961
 962                         continue;
 963                 }
 964
 965                 pmd_base = (pmd_t *)pud_page_vaddr(*pud);
 966                 remove_pmd_table(pmd_base, addr, next, direct);
 967                 free_pmd_table(pmd_base, pud);
 968         }
 969
 970         if (direct)
 971                 update_page_count(PG_LEVEL_1G, -pages);
 972 }
 973
 974 /* start and end are both virtual address. */
 975 static void __meminit
 976 remove_pagetable(unsigned long start, unsigned long end, bool direct)
 977 {
 978         unsigned long next;
 979         pgd_t *pgd;
 980         pud_t *pud;
 981         bool pgd_changed = false;
 982
 983         for (; start < end; start = next) {
 984                 next = pgd_addr_end(start, end);
 985
 986                 pgd = pgd_offset_k(start);
 987                 if (!pgd_present(*pgd))
 988                         continue;
 989
 990                 pud = (pud_t *)pgd_page_vaddr(*pgd);
 991                 remove_pud_table(pud, start, next, direct);
 992                 if (free_pud_table(pud, pgd))
 993                         pgd_changed = true;
 994         }
 995
 996         if (pgd_changed)
 997                 sync_global_pgds(start, end - 1);
 998
 999         flush_tlb_all();
1000 }
1001
1002 void __ref vmemmap_free(unsigned long start, unsigned long end)
1003 {
1004         remove_pagetable(start, end, false);
1005 }
1006
1007 #ifdef CONFIG_MEMORY_HOTREMOVE
1008 static void __meminit
1009 kernel_physical_mapping_remove(unsigned long start, unsigned long end)
1010 {
1011         start = (unsigned long)__va(start);
1012         end = (unsigned long)__va(end);
1013
1014         remove_pagetable(start, end, true);
1015 }
1016
1017 int __ref arch_remove_memory(u64 start, u64 size)
1018 {
1019         unsigned long start_pfn = start >> PAGE_SHIFT;
1020         unsigned long nr_pages = size >> PAGE_SHIFT;
1021         struct zone *zone;
1022         int ret;
1023
1024         zone = page_zone(pfn_to_page(start_pfn));
1025         kernel_physical_mapping_remove(start, start + size);
1026         ret = __remove_pages(zone, start_pfn, nr_pages);
1027         WARN_ON_ONCE(ret);
1028
1029         return ret;
1030 }
1031 #endif
1032 #endif /* CONFIG_MEMORY_HOTPLUG */
1033
1034 static struct kcore_list kcore_vsyscall;
1035
1036 static void __init register_page_bootmem_info(void)
1037 {
1038 #ifdef CONFIG_NUMA
1039         int i;
1040
1041         for_each_online_node(i)
1042                 register_page_bootmem_info_node(NODE_DATA(i));
1043 #endif
1044 }
1045
1046 void __init mem_init(void)
1047 {
1048         pci_iommu_alloc();
1049
1050         /* clear_bss() already clear the empty_zero_page */
1051
1052         register_page_bootmem_info();
1053
1054         /* this will put all memory onto the freelists */
1055         free_all_bootmem();
1056         after_bootmem = 1;
1057
1058         /* Register memory areas for /proc/kcore */
1059         kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
1060                          PAGE_SIZE, KCORE_OTHER);
1061
1062         mem_init_print_info(NULL);
1063 }
1064
1065 #ifdef CONFIG_DEBUG_RODATA
1066 const int rodata_test_data = 0xC3;
1067 EXPORT_SYMBOL_GPL(rodata_test_data);
1068
1069 int kernel_set_to_readonly;
1070
1071 void set_kernel_text_rw(void)
1072 {
1073         unsigned long start = PFN_ALIGN(_text);
1074         unsigned long end = PFN_ALIGN(__stop___ex_table);
1075
1076         if (!kernel_set_to_readonly)
1077                 return;
1078
1079         pr_debug("Set kernel text: %lx - %lx for read write\n",
1080                  start, end);
1081
1082         /*
1083          * Make the kernel identity mapping for text RW. Kernel text
1084          * mapping will always be RO. Refer to the comment in
1085          * static_protections() in pageattr.c
1086          */
1087         set_memory_rw(start, (end - start) >> PAGE_SHIFT);
1088 }
1089
1090 void set_kernel_text_ro(void)
1091 {
1092         unsigned long start = PFN_ALIGN(_text);
1093         unsigned long end = PFN_ALIGN(__stop___ex_table);
1094
1095         if (!kernel_set_to_readonly)
1096                 return;
1097
1098         pr_debug("Set kernel text: %lx - %lx for read only\n",
1099                  start, end);
1100
1101         /*
1102          * Set the kernel identity mapping for text RO.
1103          */
1104         set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1105 }
1106
1107 void mark_rodata_ro(void)
1108 {
1109         unsigned long start = PFN_ALIGN(_text);
1110         unsigned long rodata_start = PFN_ALIGN(__start_rodata);
1111         unsigned long end = (unsigned long) &__end_rodata_hpage_align;
1112         unsigned long text_end = PFN_ALIGN(&__stop___ex_table);
1113         unsigned long rodata_end = PFN_ALIGN(&__end_rodata);
1114         unsigned long all_end = PFN_ALIGN(&_end);
1115
1116         printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
1117                (end - start) >> 10);
1118         set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1119
1120         kernel_set_to_readonly = 1;
1121
1122         /*
1123          * The rodata/data/bss/brk section (but not the kernel text!)
1124          * should also be not-executable.
1125          */
1126         set_memory_nx(rodata_start, (all_end - rodata_start) >> PAGE_SHIFT);
1127
1128         rodata_test();
1129
1130 #ifdef CONFIG_CPA_DEBUG
1131         printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
1132         set_memory_rw(start, (end-start) >> PAGE_SHIFT);
1133
1134         printk(KERN_INFO "Testing CPA: again\n");
1135         set_memory_ro(start, (end-start) >> PAGE_SHIFT);
1136 #endif
1137
1138         free_init_pages("unused kernel",
1139                         (unsigned long) __va(__pa_symbol(text_end)),
1140                         (unsigned long) __va(__pa_symbol(rodata_start)));
1141         free_init_pages("unused kernel",
1142                         (unsigned long) __va(__pa_symbol(rodata_end)),
1143                         (unsigned long) __va(__pa_symbol(_sdata)));
1144 }
1145
1146 #endif
1147
1148 int kern_addr_valid(unsigned long addr)
1149 {
1150         unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
1151         pgd_t *pgd;
1152         pud_t *pud;
1153         pmd_t *pmd;
1154         pte_t *pte;
1155
1156         if (above != 0 && above != -1UL)
1157                 return 0;
1158
1159         pgd = pgd_offset_k(addr);
1160         if (pgd_none(*pgd))
1161                 return 0;
1162
1163         pud = pud_offset(pgd, addr);
1164         if (pud_none(*pud))
1165                 return 0;
1166
1167         if (pud_large(*pud))
1168                 return pfn_valid(pud_pfn(*pud));
1169
1170         pmd = pmd_offset(pud, addr);
1171         if (pmd_none(*pmd))
1172                 return 0;
1173
1174         if (pmd_large(*pmd))
1175                 return pfn_valid(pmd_pfn(*pmd));
1176
1177         pte = pte_offset_kernel(pmd, addr);
1178         if (pte_none(*pte))
1179                 return 0;
1180
1181         return pfn_valid(pte_pfn(*pte));
1182 }
1183
1184 /*
1185  * A pseudo VMA to allow ptrace access for the vsyscall page.  This only
1186  * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
1187  * not need special handling anymore:
1188  */
1189 static const char *gate_vma_name(struct vm_area_struct *vma)
1190 {
1191         return "[vsyscall]";
1192 }
1193 static struct vm_operations_struct gate_vma_ops = {
1194         .name = gate_vma_name,
1195 };
1196 static struct vm_area_struct gate_vma = {
1197         .vm_start       = VSYSCALL_ADDR,
1198         .vm_end         = VSYSCALL_ADDR + PAGE_SIZE,
1199         .vm_page_prot   = PAGE_READONLY_EXEC,
1200         .vm_flags       = VM_READ | VM_EXEC,
1201         .vm_ops         = &gate_vma_ops,
1202 };
1203
1204 struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
1205 {
1206 #ifdef CONFIG_IA32_EMULATION
1207         if (!mm || mm->context.ia32_compat)
1208                 return NULL;
1209 #endif
1210         return &gate_vma;
1211 }
1212
1213 int in_gate_area(struct mm_struct *mm, unsigned long addr)
1214 {
1215         struct vm_area_struct *vma = get_gate_vma(mm);
1216
1217         if (!vma)
1218                 return 0;
1219
1220         return (addr >= vma->vm_start) && (addr < vma->vm_end);
1221 }
1222
1223 /*
1224  * Use this when you have no reliable mm, typically from interrupt
1225  * context. It is less reliable than using a task's mm and may give
1226  * false positives.
1227  */
1228 int in_gate_area_no_mm(unsigned long addr)
1229 {
1230         return (addr & PAGE_MASK) == VSYSCALL_ADDR;
1231 }
1232
1233 static unsigned long probe_memory_block_size(void)
1234 {
1235         /* start from 2g */
1236         unsigned long bz = 1UL<<31;
1237
1238 #ifdef CONFIG_X86_UV
1239         if (is_uv_system()) {
1240                 printk(KERN_INFO "UV: memory block size 2GB\n");
1241                 return 2UL * 1024 * 1024 * 1024;
1242         }
1243 #endif
1244
1245         /* less than 64g installed */
1246         if ((max_pfn << PAGE_SHIFT) < (16UL << 32))
1247                 return MIN_MEMORY_BLOCK_SIZE;
1248
1249         /* get the tail size */
1250         while (bz > MIN_MEMORY_BLOCK_SIZE) {
1251                 if (!((max_pfn << PAGE_SHIFT) & (bz - 1)))
1252                         break;
1253                 bz >>= 1;
1254         }
1255
1256         printk(KERN_DEBUG "memory block size : %ldMB\n", bz >> 20);
1257
1258         return bz;
1259 }
1260
1261 static unsigned long memory_block_size_probed;
1262 unsigned long memory_block_size_bytes(void)
1263 {
1264         if (!memory_block_size_probed)
1265                 memory_block_size_probed = probe_memory_block_size();
1266
1267         return memory_block_size_probed;
1268 }
1269
1270 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1271 /*
1272  * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
1273  */
1274 static long __meminitdata addr_start, addr_end;
1275 static void __meminitdata *p_start, *p_end;
1276 static int __meminitdata node_start;
1277
1278 static int __meminit vmemmap_populate_hugepages(unsigned long start,
1279                                                 unsigned long end, int node)
1280 {
1281         unsigned long addr;
1282         unsigned long next;
1283         pgd_t *pgd;
1284         pud_t *pud;
1285         pmd_t *pmd;
1286
1287         for (addr = start; addr < end; addr = next) {
1288                 next = pmd_addr_end(addr, end);
1289
1290                 pgd = vmemmap_pgd_populate(addr, node);
1291                 if (!pgd)
1292                         return -ENOMEM;
1293
1294                 pud = vmemmap_pud_populate(pgd, addr, node);
1295                 if (!pud)
1296                         return -ENOMEM;
1297
1298                 pmd = pmd_offset(pud, addr);
1299                 if (pmd_none(*pmd)) {
1300                         void *p;
1301
1302                         p = vmemmap_alloc_block_buf(PMD_SIZE, node);
1303                         if (p) {
1304                                 pte_t entry;
1305
1306                                 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
1307                                                 PAGE_KERNEL_LARGE);
1308                                 set_pmd(pmd, __pmd(pte_val(entry)));
1309
1310                                 /* check to see if we have contiguous blocks */
1311                                 if (p_end != p || node_start != node) {
1312                                         if (p_start)
1313                                                 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1314                                                        addr_start, addr_end-1, p_start, p_end-1, node_start);
1315                                         addr_start = addr;
1316                                         node_start = node;
1317                                         p_start = p;
1318                                 }
1319
1320                                 addr_end = addr + PMD_SIZE;
1321                                 p_end = p + PMD_SIZE;
1322                                 continue;
1323                         }
1324                 } else if (pmd_large(*pmd)) {
1325                         vmemmap_verify((pte_t *)pmd, node, addr, next);
1326                         continue;
1327                 }
1328                 pr_warn_once("vmemmap: falling back to regular page backing\n");
1329                 if (vmemmap_populate_basepages(addr, next, node))
1330                         return -ENOMEM;
1331         }
1332         return 0;
1333 }
1334
1335 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
1336 {
1337         int err;
1338
1339         if (cpu_has_pse)
1340                 err = vmemmap_populate_hugepages(start, end, node);
1341         else
1342                 err = vmemmap_populate_basepages(start, end, node);
1343         if (!err)
1344                 sync_global_pgds(start, end - 1);
1345         return err;
1346 }
1347
1348 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
1349 void register_page_bootmem_memmap(unsigned long section_nr,
1350                                   struct page *start_page, unsigned long size)
1351 {
1352         unsigned long addr = (unsigned long)start_page;
1353         unsigned long end = (unsigned long)(start_page + size);
1354         unsigned long next;
1355         pgd_t *pgd;
1356         pud_t *pud;
1357         pmd_t *pmd;
1358         unsigned int nr_pages;
1359         struct page *page;
1360
1361         for (; addr < end; addr = next) {
1362                 pte_t *pte = NULL;
1363
1364                 pgd = pgd_offset_k(addr);
1365                 if (pgd_none(*pgd)) {
1366                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1367                         continue;
1368                 }
1369                 get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
1370
1371                 pud = pud_offset(pgd, addr);
1372                 if (pud_none(*pud)) {
1373                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1374                         continue;
1375                 }
1376                 get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
1377
1378                 if (!cpu_has_pse) {
1379                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1380                         pmd = pmd_offset(pud, addr);
1381                         if (pmd_none(*pmd))
1382                                 continue;
1383                         get_page_bootmem(section_nr, pmd_page(*pmd),
1384                                          MIX_SECTION_INFO);
1385
1386                         pte = pte_offset_kernel(pmd, addr);
1387                         if (pte_none(*pte))
1388                                 continue;
1389                         get_page_bootmem(section_nr, pte_page(*pte),
1390                                          SECTION_INFO);
1391                 } else {
1392                         next = pmd_addr_end(addr, end);
1393
1394                         pmd = pmd_offset(pud, addr);
1395                         if (pmd_none(*pmd))
1396                                 continue;
1397
1398                         nr_pages = 1 << (get_order(PMD_SIZE));
1399                         page = pmd_page(*pmd);
1400                         while (nr_pages--)
1401                                 get_page_bootmem(section_nr, page++,
1402                                                  SECTION_INFO);
1403                 }
1404         }
1405 }
1406 #endif
1407
1408 void __meminit vmemmap_populate_print_last(void)
1409 {
1410         if (p_start) {
1411                 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1412                         addr_start, addr_end-1, p_start, p_end-1, node_start);
1413                 p_start = NULL;
1414                 p_end = NULL;
1415                 node_start = 0;
1416         }
1417 }
1418 #endif