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/setup.h>
  56
  57 #include "mm_internal.h"
  58
  59 static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page,
  60                            unsigned long addr, unsigned long end)
  61 {
  62         addr &= PMD_MASK;
  63         for (; addr < end; addr += PMD_SIZE) {
  64                 pmd_t *pmd = pmd_page + pmd_index(addr);
  65
  66                 if (!pmd_present(*pmd))
  67                         set_pmd(pmd, __pmd(addr | pmd_flag));
  68         }
  69 }
  70 static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
  71                           unsigned long addr, unsigned long end)
  72 {
  73         unsigned long next;
  74
  75         for (; addr < end; addr = next) {
  76                 pud_t *pud = pud_page + pud_index(addr);
  77                 pmd_t *pmd;
  78
  79                 next = (addr & PUD_MASK) + PUD_SIZE;
  80                 if (next > end)
  81                         next = end;
  82
  83                 if (pud_present(*pud)) {
  84                         pmd = pmd_offset(pud, 0);
  85                         ident_pmd_init(info->pmd_flag, pmd, addr, next);
  86                         continue;
  87                 }
  88                 pmd = (pmd_t *)info->alloc_pgt_page(info->context);
  89                 if (!pmd)
  90                         return -ENOMEM;
  91                 ident_pmd_init(info->pmd_flag, pmd, addr, next);
  92                 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
  93         }
  94
  95         return 0;
  96 }
  97
  98 int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
  99                               unsigned long addr, unsigned long end)
 100 {
 101         unsigned long next;
 102         int result;
 103         int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0;
 104
 105         for (; addr < end; addr = next) {
 106                 pgd_t *pgd = pgd_page + pgd_index(addr) + off;
 107                 pud_t *pud;
 108
 109                 next = (addr & PGDIR_MASK) + PGDIR_SIZE;
 110                 if (next > end)
 111                         next = end;
 112
 113                 if (pgd_present(*pgd)) {
 114                         pud = pud_offset(pgd, 0);
 115                         result = ident_pud_init(info, pud, addr, next);
 116                         if (result)
 117                                 return result;
 118                         continue;
 119                 }
 120
 121                 pud = (pud_t *)info->alloc_pgt_page(info->context);
 122                 if (!pud)
 123                         return -ENOMEM;
 124                 result = ident_pud_init(info, pud, addr, next);
 125                 if (result)
 126                         return result;
 127                 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
 128         }
 129
 130         return 0;
 131 }
 132
 133 /*
 134  * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
 135  * physical space so we can cache the place of the first one and move
 136  * around without checking the pgd every time.
 137  */
 138
 139 pteval_t __supported_pte_mask __read_mostly = ~0;
 140 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 141
 142 int force_personality32;
 143
 144 /*
 145  * noexec32=on|off
 146  * Control non executable heap for 32bit processes.
 147  * To control the stack too use noexec=off
 148  *
 149  * on   PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
 150  * off  PROT_READ implies PROT_EXEC
 151  */
 152 static int __init nonx32_setup(char *str)
 153 {
 154         if (!strcmp(str, "on"))
 155                 force_personality32 &= ~READ_IMPLIES_EXEC;
 156         else if (!strcmp(str, "off"))
 157                 force_personality32 |= READ_IMPLIES_EXEC;
 158         return 1;
 159 }
 160 __setup("noexec32=", nonx32_setup);
 161
 162 /*
 163  * When memory was added/removed make sure all the processes MM have
 164  * suitable PGD entries in the local PGD level page.
 165  */
 166 void sync_global_pgds(unsigned long start, unsigned long end, int removed)
 167 {
 168         unsigned long address;
 169
 170         for (address = start; address <= end; address += PGDIR_SIZE) {
 171                 const pgd_t *pgd_ref = pgd_offset_k(address);
 172                 struct page *page;
 173
 174                 /*
 175                  * When it is called after memory hot remove, pgd_none()
 176                  * returns true. In this case (removed == 1), we must clear
 177                  * the PGD entries in the local PGD level page.
 178                  */
 179                 if (pgd_none(*pgd_ref) && !removed)
 180                         continue;
 181
 182                 spin_lock(&pgd_lock);
 183                 list_for_each_entry(page, &pgd_list, lru) {
 184                         pgd_t *pgd;
 185                         spinlock_t *pgt_lock;
 186
 187                         pgd = (pgd_t *)page_address(page) + pgd_index(address);
 188                         /* the pgt_lock only for Xen */
 189                         pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
 190                         spin_lock(pgt_lock);
 191
 192                         if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
 193                                 BUG_ON(pgd_page_vaddr(*pgd)
 194                                        != pgd_page_vaddr(*pgd_ref));
 195
 196                         if (removed) {
 197                                 if (pgd_none(*pgd_ref) && !pgd_none(*pgd))
 198                                         pgd_clear(pgd);
 199                         } else {
 200                                 if (pgd_none(*pgd))
 201                                         set_pgd(pgd, *pgd_ref);
 202                         }
 203
 204                         spin_unlock(pgt_lock);
 205                 }
 206                 spin_unlock(&pgd_lock);
 207         }
 208 }
 209
 210 /*
 211  * NOTE: This function is marked __ref because it calls __init function
 212  * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
 213  */
 214 static __ref void *spp_getpage(void)
 215 {
 216         void *ptr;
 217
 218         if (after_bootmem)
 219                 ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
 220         else
 221                 ptr = alloc_bootmem_pages(PAGE_SIZE);
 222
 223         if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
 224                 panic("set_pte_phys: cannot allocate page data %s\n",
 225                         after_bootmem ? "after bootmem" : "");
 226         }
 227
 228         pr_debug("spp_getpage %p\n", ptr);
 229
 230         return ptr;
 231 }
 232
 233 static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
 234 {
 235         if (pgd_none(*pgd)) {
 236                 pud_t *pud = (pud_t *)spp_getpage();
 237                 pgd_populate(&init_mm, pgd, pud);
 238                 if (pud != pud_offset(pgd, 0))
 239                         printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
 240                                pud, pud_offset(pgd, 0));
 241         }
 242         return pud_offset(pgd, vaddr);
 243 }
 244
 245 static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
 246 {
 247         if (pud_none(*pud)) {
 248                 pmd_t *pmd = (pmd_t *) spp_getpage();
 249                 pud_populate(&init_mm, pud, pmd);
 250                 if (pmd != pmd_offset(pud, 0))
 251                         printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
 252                                pmd, pmd_offset(pud, 0));
 253         }
 254         return pmd_offset(pud, vaddr);
 255 }
 256
 257 static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
 258 {
 259         if (pmd_none(*pmd)) {
 260                 pte_t *pte = (pte_t *) spp_getpage();
 261                 pmd_populate_kernel(&init_mm, pmd, pte);
 262                 if (pte != pte_offset_kernel(pmd, 0))
 263                         printk(KERN_ERR "PAGETABLE BUG #02!\n");
 264         }
 265         return pte_offset_kernel(pmd, vaddr);
 266 }
 267
 268 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
 269 {
 270         pud_t *pud;
 271         pmd_t *pmd;
 272         pte_t *pte;
 273
 274         pud = pud_page + pud_index(vaddr);
 275         pmd = fill_pmd(pud, vaddr);
 276         pte = fill_pte(pmd, vaddr);
 277
 278         set_pte(pte, new_pte);
 279
 280         /*
 281          * It's enough to flush this one mapping.
 282          * (PGE mappings get flushed as well)
 283          */
 284         __flush_tlb_one(vaddr);
 285 }
 286
 287 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 288 {
 289         pgd_t *pgd;
 290         pud_t *pud_page;
 291
 292         pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
 293
 294         pgd = pgd_offset_k(vaddr);
 295         if (pgd_none(*pgd)) {
 296                 printk(KERN_ERR
 297                         "PGD FIXMAP MISSING, it should be setup in head.S!\n");
 298                 return;
 299         }
 300         pud_page = (pud_t*)pgd_page_vaddr(*pgd);
 301         set_pte_vaddr_pud(pud_page, vaddr, pteval);
 302 }
 303
 304 pmd_t * __init populate_extra_pmd(unsigned long vaddr)
 305 {
 306         pgd_t *pgd;
 307         pud_t *pud;
 308
 309         pgd = pgd_offset_k(vaddr);
 310         pud = fill_pud(pgd, vaddr);
 311         return fill_pmd(pud, vaddr);
 312 }
 313
 314 pte_t * __init populate_extra_pte(unsigned long vaddr)
 315 {
 316         pmd_t *pmd;
 317
 318         pmd = populate_extra_pmd(vaddr);
 319         return fill_pte(pmd, vaddr);
 320 }
 321
 322 /*
 323  * Create large page table mappings for a range of physical addresses.
 324  */
 325 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
 326                                         enum page_cache_mode cache)
 327 {
 328         pgd_t *pgd;
 329         pud_t *pud;
 330         pmd_t *pmd;
 331         pgprot_t prot;
 332
 333         pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
 334                 pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache)));
 335         BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
 336         for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
 337                 pgd = pgd_offset_k((unsigned long)__va(phys));
 338                 if (pgd_none(*pgd)) {
 339                         pud = (pud_t *) spp_getpage();
 340                         set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
 341                                                 _PAGE_USER));
 342                 }
 343                 pud = pud_offset(pgd, (unsigned long)__va(phys));
 344                 if (pud_none(*pud)) {
 345                         pmd = (pmd_t *) spp_getpage();
 346                         set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
 347                                                 _PAGE_USER));
 348                 }
 349                 pmd = pmd_offset(pud, phys);
 350                 BUG_ON(!pmd_none(*pmd));
 351                 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
 352         }
 353 }
 354
 355 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
 356 {
 357         __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
 358 }
 359
 360 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
 361 {
 362         __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
 363 }
 364
 365 /*
 366  * The head.S code sets up the kernel high mapping:
 367  *
 368  *   from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
 369  *
 370  * phys_base holds the negative offset to the kernel, which is added
 371  * to the compile time generated pmds. This results in invalid pmds up
 372  * to the point where we hit the physaddr 0 mapping.
 373  *
 374  * We limit the mappings to the region from _text to _brk_end.  _brk_end
 375  * is rounded up to the 2MB boundary. This catches the invalid pmds as
 376  * well, as they are located before _text:
 377  */
 378 void __init cleanup_highmap(void)
 379 {
 380         unsigned long vaddr = __START_KERNEL_map;
 381         unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
 382         unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
 383         pmd_t *pmd = level2_kernel_pgt;
 384
 385         /*
 386          * Native path, max_pfn_mapped is not set yet.
 387          * Xen has valid max_pfn_mapped set in
 388          *      arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
 389          */
 390         if (max_pfn_mapped)
 391                 vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
 392
 393         for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
 394                 if (pmd_none(*pmd))
 395                         continue;
 396                 if (vaddr < (unsigned long) _text || vaddr > end)
 397                         set_pmd(pmd, __pmd(0));
 398         }
 399 }
 400
 401 static unsigned long __meminit
 402 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
 403               pgprot_t prot)
 404 {
 405         unsigned long pages = 0, next;
 406         unsigned long last_map_addr = end;
 407         int i;
 408
 409         pte_t *pte = pte_page + pte_index(addr);
 410
 411         for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) {
 412                 next = (addr & PAGE_MASK) + PAGE_SIZE;
 413                 if (addr >= end) {
 414                         if (!after_bootmem &&
 415                             !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) &&
 416                             !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN))
 417                                 set_pte(pte, __pte(0));
 418                         continue;
 419                 }
 420
 421                 /*
 422                  * We will re-use the existing mapping.
 423                  * Xen for example has some special requirements, like mapping
 424                  * pagetable pages as RO. So assume someone who pre-setup
 425                  * these mappings are more intelligent.
 426                  */
 427                 if (pte_val(*pte)) {
 428                         if (!after_bootmem)
 429                                 pages++;
 430                         continue;
 431                 }
 432
 433                 if (0)
 434                         printk("   pte=%p addr=%lx pte=%016lx\n",
 435                                pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
 436                 pages++;
 437                 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
 438                 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
 439         }
 440
 441         update_page_count(PG_LEVEL_4K, pages);
 442
 443         return last_map_addr;
 444 }
 445
 446 static unsigned long __meminit
 447 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
 448               unsigned long page_size_mask, pgprot_t prot)
 449 {
 450         unsigned long pages = 0, next;
 451         unsigned long last_map_addr = end;
 452
 453         int i = pmd_index(address);
 454
 455         for (; i < PTRS_PER_PMD; i++, address = next) {
 456                 pmd_t *pmd = pmd_page + pmd_index(address);
 457                 pte_t *pte;
 458                 pgprot_t new_prot = prot;
 459
 460                 next = (address & PMD_MASK) + PMD_SIZE;
 461                 if (address >= end) {
 462                         if (!after_bootmem &&
 463                             !e820_any_mapped(address & PMD_MASK, next, E820_RAM) &&
 464                             !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN))
 465                                 set_pmd(pmd, __pmd(0));
 466                         continue;
 467                 }
 468
 469                 if (pmd_val(*pmd)) {
 470                         if (!pmd_large(*pmd)) {
 471                                 spin_lock(&init_mm.page_table_lock);
 472                                 pte = (pte_t *)pmd_page_vaddr(*pmd);
 473                                 last_map_addr = phys_pte_init(pte, address,
 474                                                                 end, prot);
 475                                 spin_unlock(&init_mm.page_table_lock);
 476                                 continue;
 477                         }
 478                         /*
 479                          * If we are ok with PG_LEVEL_2M mapping, then we will
 480                          * use the existing mapping,
 481                          *
 482                          * Otherwise, we will split the large page mapping but
 483                          * use the same existing protection bits except for
 484                          * large page, so that we don't violate Intel's TLB
 485                          * Application note (317080) which says, while changing
 486                          * the page sizes, new and old translations should
 487                          * not differ with respect to page frame and
 488                          * attributes.
 489                          */
 490                         if (page_size_mask & (1 << PG_LEVEL_2M)) {
 491                                 if (!after_bootmem)
 492                                         pages++;
 493                                 last_map_addr = next;
 494                                 continue;
 495                         }
 496                         new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
 497                 }
 498
 499                 if (page_size_mask & (1<<PG_LEVEL_2M)) {
 500                         pages++;
 501                         spin_lock(&init_mm.page_table_lock);
 502                         set_pte((pte_t *)pmd,
 503                                 pfn_pte((address & PMD_MASK) >> PAGE_SHIFT,
 504                                         __pgprot(pgprot_val(prot) | _PAGE_PSE)));
 505                         spin_unlock(&init_mm.page_table_lock);
 506                         last_map_addr = next;
 507                         continue;
 508                 }
 509
 510                 pte = alloc_low_page();
 511                 last_map_addr = phys_pte_init(pte, address, end, new_prot);
 512
 513                 spin_lock(&init_mm.page_table_lock);
 514                 pmd_populate_kernel(&init_mm, pmd, pte);
 515                 spin_unlock(&init_mm.page_table_lock);
 516         }
 517         update_page_count(PG_LEVEL_2M, pages);
 518         return last_map_addr;
 519 }
 520
 521 static unsigned long __meminit
 522 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
 523                          unsigned long page_size_mask)
 524 {
 525         unsigned long pages = 0, next;
 526         unsigned long last_map_addr = end;
 527         int i = pud_index(addr);
 528
 529         for (; i < PTRS_PER_PUD; i++, addr = next) {
 530                 pud_t *pud = pud_page + pud_index(addr);
 531                 pmd_t *pmd;
 532                 pgprot_t prot = PAGE_KERNEL;
 533
 534                 next = (addr & PUD_MASK) + PUD_SIZE;
 535                 if (addr >= end) {
 536                         if (!after_bootmem &&
 537                             !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) &&
 538                             !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN))
 539                                 set_pud(pud, __pud(0));
 540                         continue;
 541                 }
 542
 543                 if (pud_val(*pud)) {
 544                         if (!pud_large(*pud)) {
 545                                 pmd = pmd_offset(pud, 0);
 546                                 last_map_addr = phys_pmd_init(pmd, addr, end,
 547                                                          page_size_mask, prot);
 548                                 __flush_tlb_all();
 549                                 continue;
 550                         }
 551                         /*
 552                          * If we are ok with PG_LEVEL_1G mapping, then we will
 553                          * use the existing mapping.
 554                          *
 555                          * Otherwise, we will split the gbpage mapping but use
 556                          * the same existing protection  bits except for large
 557                          * page, so that we don't violate Intel's TLB
 558                          * Application note (317080) which says, while changing
 559                          * the page sizes, new and old translations should
 560                          * not differ with respect to page frame and
 561                          * attributes.
 562                          */
 563                         if (page_size_mask & (1 << PG_LEVEL_1G)) {
 564                                 if (!after_bootmem)
 565                                         pages++;
 566                                 last_map_addr = next;
 567                                 continue;
 568                         }
 569                         prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
 570                 }
 571
 572                 if (page_size_mask & (1<<PG_LEVEL_1G)) {
 573                         pages++;
 574                         spin_lock(&init_mm.page_table_lock);
 575                         set_pte((pte_t *)pud,
 576                                 pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT,
 577                                         PAGE_KERNEL_LARGE));
 578                         spin_unlock(&init_mm.page_table_lock);
 579                         last_map_addr = next;
 580                         continue;
 581                 }
 582
 583                 pmd = alloc_low_page();
 584                 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
 585                                               prot);
 586
 587                 spin_lock(&init_mm.page_table_lock);
 588                 pud_populate(&init_mm, pud, pmd);
 589                 spin_unlock(&init_mm.page_table_lock);
 590         }
 591         __flush_tlb_all();
 592
 593         update_page_count(PG_LEVEL_1G, pages);
 594
 595         return last_map_addr;
 596 }
 597
 598 unsigned long __meminit
 599 kernel_physical_mapping_init(unsigned long start,
 600                              unsigned long end,
 601                              unsigned long page_size_mask)
 602 {
 603         bool pgd_changed = false;
 604         unsigned long next, last_map_addr = end;
 605         unsigned long addr;
 606
 607         start = (unsigned long)__va(start);
 608         end = (unsigned long)__va(end);
 609         addr = start;
 610
 611         for (; start < end; start = next) {
 612                 pgd_t *pgd = pgd_offset_k(start);
 613                 pud_t *pud;
 614
 615                 next = (start & PGDIR_MASK) + PGDIR_SIZE;
 616
 617                 if (pgd_val(*pgd)) {
 618                         pud = (pud_t *)pgd_page_vaddr(*pgd);
 619                         last_map_addr = phys_pud_init(pud, __pa(start),
 620                                                  __pa(end), page_size_mask);
 621                         continue;
 622                 }
 623
 624                 pud = alloc_low_page();
 625                 last_map_addr = phys_pud_init(pud, __pa(start), __pa(end),
 626                                                  page_size_mask);
 627
 628                 spin_lock(&init_mm.page_table_lock);
 629                 pgd_populate(&init_mm, pgd, pud);
 630                 spin_unlock(&init_mm.page_table_lock);
 631                 pgd_changed = true;
 632         }
 633
 634         if (pgd_changed)
 635                 sync_global_pgds(addr, end - 1, 0);
 636
 637         __flush_tlb_all();
 638
 639         return last_map_addr;
 640 }
 641
 642 #ifndef CONFIG_NUMA
 643 void __init initmem_init(void)
 644 {
 645         memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
 646 }
 647 #endif
 648
 649 void __init paging_init(void)
 650 {
 651         sparse_memory_present_with_active_regions(MAX_NUMNODES);
 652         sparse_init();
 653
 654         /*
 655          * clear the default setting with node 0
 656          * note: don't use nodes_clear here, that is really clearing when
 657          *       numa support is not compiled in, and later node_set_state
 658          *       will not set it back.
 659          */
 660         node_clear_state(0, N_MEMORY);
 661         if (N_MEMORY != N_NORMAL_MEMORY)
 662                 node_clear_state(0, N_NORMAL_MEMORY);
 663
 664         zone_sizes_init();
 665 }
 666
 667 /*
 668  * Memory hotplug specific functions
 669  */
 670 #ifdef CONFIG_MEMORY_HOTPLUG
 671 /*
 672  * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
 673  * updating.
 674  */
 675 static void  update_end_of_memory_vars(u64 start, u64 size)
 676 {
 677         unsigned long end_pfn = PFN_UP(start + size);
 678
 679         if (end_pfn > max_pfn) {
 680                 max_pfn = end_pfn;
 681                 max_low_pfn = end_pfn;
 682                 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 683         }
 684 }
 685
 686 /*
 687  * Memory is added always to NORMAL zone. This means you will never get
 688  * additional DMA/DMA32 memory.
 689  */
 690 int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
 691 {
 692         struct pglist_data *pgdat = NODE_DATA(nid);
 693         struct zone *zone = pgdat->node_zones +
 694                 zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
 695         unsigned long start_pfn = start >> PAGE_SHIFT;
 696         unsigned long nr_pages = size >> PAGE_SHIFT;
 697         int ret;
 698
 699         init_memory_mapping(start, start + size);
 700
 701         ret = __add_pages(nid, zone, start_pfn, nr_pages);
 702         WARN_ON_ONCE(ret);
 703
 704         /* update max_pfn, max_low_pfn and high_memory */
 705         update_end_of_memory_vars(start, size);
 706
 707         return ret;
 708 }
 709 EXPORT_SYMBOL_GPL(arch_add_memory);
 710
 711 #define PAGE_INUSE 0xFD
 712
 713 static void __meminit free_pagetable(struct page *page, int order)
 714 {
 715         unsigned long magic;
 716         unsigned int nr_pages = 1 << order;
 717
 718         /* bootmem page has reserved flag */
 719         if (PageReserved(page)) {
 720                 __ClearPageReserved(page);
 721
 722                 magic = (unsigned long)page->lru.next;
 723                 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
 724                         while (nr_pages--)
 725                                 put_page_bootmem(page++);
 726                 } else
 727                         while (nr_pages--)
 728                                 free_reserved_page(page++);
 729         } else
 730                 free_pages((unsigned long)page_address(page), order);
 731 }
 732
 733 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
 734 {
 735         pte_t *pte;
 736         int i;
 737
 738         for (i = 0; i < PTRS_PER_PTE; i++) {
 739                 pte = pte_start + i;
 740                 if (pte_val(*pte))
 741                         return;
 742         }
 743
 744         /* free a pte talbe */
 745         free_pagetable(pmd_page(*pmd), 0);
 746         spin_lock(&init_mm.page_table_lock);
 747         pmd_clear(pmd);
 748         spin_unlock(&init_mm.page_table_lock);
 749 }
 750
 751 static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
 752 {
 753         pmd_t *pmd;
 754         int i;
 755
 756         for (i = 0; i < PTRS_PER_PMD; i++) {
 757                 pmd = pmd_start + i;
 758                 if (pmd_val(*pmd))
 759                         return;
 760         }
 761
 762         /* free a pmd talbe */
 763         free_pagetable(pud_page(*pud), 0);
 764         spin_lock(&init_mm.page_table_lock);
 765         pud_clear(pud);
 766         spin_unlock(&init_mm.page_table_lock);
 767 }
 768
 769 /* Return true if pgd is changed, otherwise return false. */
 770 static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd)
 771 {
 772         pud_t *pud;
 773         int i;
 774
 775         for (i = 0; i < PTRS_PER_PUD; i++) {
 776                 pud = pud_start + i;
 777                 if (pud_val(*pud))
 778                         return false;
 779         }
 780
 781         /* free a pud table */
 782         free_pagetable(pgd_page(*pgd), 0);
 783         spin_lock(&init_mm.page_table_lock);
 784         pgd_clear(pgd);
 785         spin_unlock(&init_mm.page_table_lock);
 786
 787         return true;
 788 }
 789
 790 static void __meminit
 791 remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
 792                  bool direct)
 793 {
 794         unsigned long next, pages = 0;
 795         pte_t *pte;
 796         void *page_addr;
 797         phys_addr_t phys_addr;
 798
 799         pte = pte_start + pte_index(addr);
 800         for (; addr < end; addr = next, pte++) {
 801                 next = (addr + PAGE_SIZE) & PAGE_MASK;
 802                 if (next > end)
 803                         next = end;
 804
 805                 if (!pte_present(*pte))
 806                         continue;
 807
 808                 /*
 809                  * We mapped [0,1G) memory as identity mapping when
 810                  * initializing, in arch/x86/kernel/head_64.S. These
 811                  * pagetables cannot be removed.
 812                  */
 813                 phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
 814                 if (phys_addr < (phys_addr_t)0x40000000)
 815                         return;
 816
 817                 if (IS_ALIGNED(addr, PAGE_SIZE) &&
 818                     IS_ALIGNED(next, PAGE_SIZE)) {
 819                         /*
 820                          * Do not free direct mapping pages since they were
 821                          * freed when offlining, or simplely not in use.
 822                          */
 823                         if (!direct)
 824                                 free_pagetable(pte_page(*pte), 0);
 825
 826                         spin_lock(&init_mm.page_table_lock);
 827                         pte_clear(&init_mm, addr, pte);
 828                         spin_unlock(&init_mm.page_table_lock);
 829
 830                         /* For non-direct mapping, pages means nothing. */
 831                         pages++;
 832                 } else {
 833                         /*
 834                          * If we are here, we are freeing vmemmap pages since
 835                          * direct mapped memory ranges to be freed are aligned.
 836                          *
 837                          * If we are not removing the whole page, it means
 838                          * other page structs in this page are being used and
 839                          * we canot remove them. So fill the unused page_structs
 840                          * with 0xFD, and remove the page when it is wholly
 841                          * filled with 0xFD.
 842                          */
 843                         memset((void *)addr, PAGE_INUSE, next - addr);
 844
 845                         page_addr = page_address(pte_page(*pte));
 846                         if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
 847                                 free_pagetable(pte_page(*pte), 0);
 848
 849                                 spin_lock(&init_mm.page_table_lock);
 850                                 pte_clear(&init_mm, addr, pte);
 851                                 spin_unlock(&init_mm.page_table_lock);
 852                         }
 853                 }
 854         }
 855
 856         /* Call free_pte_table() in remove_pmd_table(). */
 857         flush_tlb_all();
 858         if (direct)
 859                 update_page_count(PG_LEVEL_4K, -pages);
 860 }
 861
 862 static void __meminit
 863 remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
 864                  bool direct)
 865 {
 866         unsigned long next, pages = 0;
 867         pte_t *pte_base;
 868         pmd_t *pmd;
 869         void *page_addr;
 870
 871         pmd = pmd_start + pmd_index(addr);
 872         for (; addr < end; addr = next, pmd++) {
 873                 next = pmd_addr_end(addr, end);
 874
 875                 if (!pmd_present(*pmd))
 876                         continue;
 877
 878                 if (pmd_large(*pmd)) {
 879                         if (IS_ALIGNED(addr, PMD_SIZE) &&
 880                             IS_ALIGNED(next, PMD_SIZE)) {
 881                                 if (!direct)
 882                                         free_pagetable(pmd_page(*pmd),
 883                                                        get_order(PMD_SIZE));
 884
 885                                 spin_lock(&init_mm.page_table_lock);
 886                                 pmd_clear(pmd);
 887                                 spin_unlock(&init_mm.page_table_lock);
 888                                 pages++;
 889                         } else {
 890                                 /* If here, we are freeing vmemmap pages. */
 891                                 memset((void *)addr, PAGE_INUSE, next - addr);
 892
 893                                 page_addr = page_address(pmd_page(*pmd));
 894                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 895                                                 PMD_SIZE)) {
 896                                         free_pagetable(pmd_page(*pmd),
 897                                                        get_order(PMD_SIZE));
 898
 899                                         spin_lock(&init_mm.page_table_lock);
 900                                         pmd_clear(pmd);
 901                                         spin_unlock(&init_mm.page_table_lock);
 902                                 }
 903                         }
 904
 905                         continue;
 906                 }
 907
 908                 pte_base = (pte_t *)pmd_page_vaddr(*pmd);
 909                 remove_pte_table(pte_base, addr, next, direct);
 910                 free_pte_table(pte_base, pmd);
 911         }
 912
 913         /* Call free_pmd_table() in remove_pud_table(). */
 914         if (direct)
 915                 update_page_count(PG_LEVEL_2M, -pages);
 916 }
 917
 918 static void __meminit
 919 remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
 920                  bool direct)
 921 {
 922         unsigned long next, pages = 0;
 923         pmd_t *pmd_base;
 924         pud_t *pud;
 925         void *page_addr;
 926
 927         pud = pud_start + pud_index(addr);
 928         for (; addr < end; addr = next, pud++) {
 929                 next = pud_addr_end(addr, end);
 930
 931                 if (!pud_present(*pud))
 932                         continue;
 933
 934                 if (pud_large(*pud)) {
 935                         if (IS_ALIGNED(addr, PUD_SIZE) &&
 936                             IS_ALIGNED(next, PUD_SIZE)) {
 937                                 if (!direct)
 938                                         free_pagetable(pud_page(*pud),
 939                                                        get_order(PUD_SIZE));
 940
 941                                 spin_lock(&init_mm.page_table_lock);
 942                                 pud_clear(pud);
 943                                 spin_unlock(&init_mm.page_table_lock);
 944                                 pages++;
 945                         } else {
 946                                 /* If here, we are freeing vmemmap pages. */
 947                                 memset((void *)addr, PAGE_INUSE, next - addr);
 948
 949                                 page_addr = page_address(pud_page(*pud));
 950                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 951                                                 PUD_SIZE)) {
 952                                         free_pagetable(pud_page(*pud),
 953                                                        get_order(PUD_SIZE));
 954
 955                                         spin_lock(&init_mm.page_table_lock);
 956                                         pud_clear(pud);
 957                                         spin_unlock(&init_mm.page_table_lock);
 958                                 }
 959                         }
 960
 961                         continue;
 962                 }
 963
 964                 pmd_base = (pmd_t *)pud_page_vaddr(*pud);
 965                 remove_pmd_table(pmd_base, addr, next, direct);
 966                 free_pmd_table(pmd_base, pud);
 967         }
 968
 969         if (direct)
 970                 update_page_count(PG_LEVEL_1G, -pages);
 971 }
 972
 973 /* start and end are both virtual address. */
 974 static void __meminit
 975 remove_pagetable(unsigned long start, unsigned long end, bool direct)
 976 {
 977         unsigned long next;
 978         unsigned long addr;
 979         pgd_t *pgd;
 980         pud_t *pud;
 981         bool pgd_changed = false;
 982
 983         for (addr = start; addr < end; addr = next) {
 984                 next = pgd_addr_end(addr, end);
 985
 986                 pgd = pgd_offset_k(addr);
 987                 if (!pgd_present(*pgd))
 988                         continue;
 989
 990                 pud = (pud_t *)pgd_page_vaddr(*pgd);
 991                 remove_pud_table(pud, addr, 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, 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;
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          * We align all_end to PMD_SIZE because the existing mapping
1127          * is a full PMD. If we would align _brk_end to PAGE_SIZE we
1128          * split the PMD and the reminder between _brk_end and the end
1129          * of the PMD will remain mapped executable.
1130          *
1131          * Any PMD which was setup after the one which covers _brk_end
1132          * has been zapped already via cleanup_highmem().
1133          */
1134         all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
1135         set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT);
1136
1137         rodata_test();
1138
1139 #ifdef CONFIG_CPA_DEBUG
1140         printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
1141         set_memory_rw(start, (end-start) >> PAGE_SHIFT);
1142
1143         printk(KERN_INFO "Testing CPA: again\n");
1144         set_memory_ro(start, (end-start) >> PAGE_SHIFT);
1145 #endif
1146
1147         free_init_pages("unused kernel",
1148                         (unsigned long) __va(__pa_symbol(text_end)),
1149                         (unsigned long) __va(__pa_symbol(rodata_start)));
1150         free_init_pages("unused kernel",
1151                         (unsigned long) __va(__pa_symbol(rodata_end)),
1152                         (unsigned long) __va(__pa_symbol(_sdata)));
1153
1154         debug_checkwx();
1155 }
1156
1157 #endif
1158
1159 int kern_addr_valid(unsigned long addr)
1160 {
1161         unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
1162         pgd_t *pgd;
1163         pud_t *pud;
1164         pmd_t *pmd;
1165         pte_t *pte;
1166
1167         if (above != 0 && above != -1UL)
1168                 return 0;
1169
1170         pgd = pgd_offset_k(addr);
1171         if (pgd_none(*pgd))
1172                 return 0;
1173
1174         pud = pud_offset(pgd, addr);
1175         if (pud_none(*pud))
1176                 return 0;
1177
1178         if (pud_large(*pud))
1179                 return pfn_valid(pud_pfn(*pud));
1180
1181         pmd = pmd_offset(pud, addr);
1182         if (pmd_none(*pmd))
1183                 return 0;
1184
1185         if (pmd_large(*pmd))
1186                 return pfn_valid(pmd_pfn(*pmd));
1187
1188         pte = pte_offset_kernel(pmd, addr);
1189         if (pte_none(*pte))
1190                 return 0;
1191
1192         return pfn_valid(pte_pfn(*pte));
1193 }
1194
1195 static unsigned long probe_memory_block_size(void)
1196 {
1197         /* start from 2g */
1198         unsigned long bz = 1UL<<31;
1199
1200         if (totalram_pages >= (64ULL << (30 - PAGE_SHIFT))) {
1201                 pr_info("Using 2GB memory block size for large-memory system\n");
1202                 return 2UL * 1024 * 1024 * 1024;
1203         }
1204
1205         /* less than 64g installed */
1206         if ((max_pfn << PAGE_SHIFT) < (16UL << 32))
1207                 return MIN_MEMORY_BLOCK_SIZE;
1208
1209         /* get the tail size */
1210         while (bz > MIN_MEMORY_BLOCK_SIZE) {
1211                 if (!((max_pfn << PAGE_SHIFT) & (bz - 1)))
1212                         break;
1213                 bz >>= 1;
1214         }
1215
1216         printk(KERN_DEBUG "memory block size : %ldMB\n", bz >> 20);
1217
1218         return bz;
1219 }
1220
1221 static unsigned long memory_block_size_probed;
1222 unsigned long memory_block_size_bytes(void)
1223 {
1224         if (!memory_block_size_probed)
1225                 memory_block_size_probed = probe_memory_block_size();
1226
1227         return memory_block_size_probed;
1228 }
1229
1230 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1231 /*
1232  * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
1233  */
1234 static long __meminitdata addr_start, addr_end;
1235 static void __meminitdata *p_start, *p_end;
1236 static int __meminitdata node_start;
1237
1238 static int __meminit vmemmap_populate_hugepages(unsigned long start,
1239                                                 unsigned long end, int node)
1240 {
1241         unsigned long addr;
1242         unsigned long next;
1243         pgd_t *pgd;
1244         pud_t *pud;
1245         pmd_t *pmd;
1246
1247         for (addr = start; addr < end; addr = next) {
1248                 next = pmd_addr_end(addr, end);
1249
1250                 pgd = vmemmap_pgd_populate(addr, node);
1251                 if (!pgd)
1252                         return -ENOMEM;
1253
1254                 pud = vmemmap_pud_populate(pgd, addr, node);
1255                 if (!pud)
1256                         return -ENOMEM;
1257
1258                 pmd = pmd_offset(pud, addr);
1259                 if (pmd_none(*pmd)) {
1260                         void *p;
1261
1262                         p = vmemmap_alloc_block_buf(PMD_SIZE, node);
1263                         if (p) {
1264                                 pte_t entry;
1265
1266                                 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
1267                                                 PAGE_KERNEL_LARGE);
1268                                 set_pmd(pmd, __pmd(pte_val(entry)));
1269
1270                                 /* check to see if we have contiguous blocks */
1271                                 if (p_end != p || node_start != node) {
1272                                         if (p_start)
1273                                                 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1274                                                        addr_start, addr_end-1, p_start, p_end-1, node_start);
1275                                         addr_start = addr;
1276                                         node_start = node;
1277                                         p_start = p;
1278                                 }
1279
1280                                 addr_end = addr + PMD_SIZE;
1281                                 p_end = p + PMD_SIZE;
1282                                 continue;
1283                         }
1284                 } else if (pmd_large(*pmd)) {
1285                         vmemmap_verify((pte_t *)pmd, node, addr, next);
1286                         continue;
1287                 }
1288                 pr_warn_once("vmemmap: falling back to regular page backing\n");
1289                 if (vmemmap_populate_basepages(addr, next, node))
1290                         return -ENOMEM;
1291         }
1292         return 0;
1293 }
1294
1295 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
1296 {
1297         int err;
1298
1299         if (cpu_has_pse)
1300                 err = vmemmap_populate_hugepages(start, end, node);
1301         else
1302                 err = vmemmap_populate_basepages(start, end, node);
1303         if (!err)
1304                 sync_global_pgds(start, end - 1, 0);
1305         return err;
1306 }
1307
1308 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
1309 void register_page_bootmem_memmap(unsigned long section_nr,
1310                                   struct page *start_page, unsigned long size)
1311 {
1312         unsigned long addr = (unsigned long)start_page;
1313         unsigned long end = (unsigned long)(start_page + size);
1314         unsigned long next;
1315         pgd_t *pgd;
1316         pud_t *pud;
1317         pmd_t *pmd;
1318         unsigned int nr_pages;
1319         struct page *page;
1320
1321         for (; addr < end; addr = next) {
1322                 pte_t *pte = NULL;
1323
1324                 pgd = pgd_offset_k(addr);
1325                 if (pgd_none(*pgd)) {
1326                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1327                         continue;
1328                 }
1329                 get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
1330
1331                 pud = pud_offset(pgd, addr);
1332                 if (pud_none(*pud)) {
1333                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1334                         continue;
1335                 }
1336                 get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
1337
1338                 if (!cpu_has_pse) {
1339                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1340                         pmd = pmd_offset(pud, addr);
1341                         if (pmd_none(*pmd))
1342                                 continue;
1343                         get_page_bootmem(section_nr, pmd_page(*pmd),
1344                                          MIX_SECTION_INFO);
1345
1346                         pte = pte_offset_kernel(pmd, addr);
1347                         if (pte_none(*pte))
1348                                 continue;
1349                         get_page_bootmem(section_nr, pte_page(*pte),
1350                                          SECTION_INFO);
1351                 } else {
1352                         next = pmd_addr_end(addr, end);
1353
1354                         pmd = pmd_offset(pud, addr);
1355                         if (pmd_none(*pmd))
1356                                 continue;
1357
1358                         nr_pages = 1 << (get_order(PMD_SIZE));
1359                         page = pmd_page(*pmd);
1360                         while (nr_pages--)
1361                                 get_page_bootmem(section_nr, page++,
1362                                                  SECTION_INFO);
1363                 }
1364         }
1365 }
1366 #endif
1367
1368 void __meminit vmemmap_populate_print_last(void)
1369 {
1370         if (p_start) {
1371                 printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1372                         addr_start, addr_end-1, p_start, p_end-1, node_start);
1373                 p_start = NULL;
1374                 p_end = NULL;
1375                 node_start = 0;
1376         }
1377 }
1378 #endif