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/memremap.h>
  34 #include <linux/nmi.h>
  35 #include <linux/gfp.h>
  36 #include <linux/kcore.h>
  37
  38 #include <asm/processor.h>
  39 #include <asm/bios_ebda.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/pgalloc.h>
  43 #include <asm/dma.h>
  44 #include <asm/fixmap.h>
  45 #include <asm/e820.h>
  46 #include <asm/apic.h>
  47 #include <asm/tlb.h>
  48 #include <asm/mmu_context.h>
  49 #include <asm/proto.h>
  50 #include <asm/smp.h>
  51 #include <asm/sections.h>
  52 #include <asm/kdebug.h>
  53 #include <asm/numa.h>
  54 #include <asm/cacheflush.h>
  55 #include <asm/init.h>
  56 #include <asm/uv/uv.h>
  57 #include <asm/setup.h>
  58
  59 #include "mm_internal.h"
  60
  61 static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page,
  62                            unsigned long addr, unsigned long end)
  63 {
  64         addr &= PMD_MASK;
  65         for (; addr < end; addr += PMD_SIZE) {
  66                 pmd_t *pmd = pmd_page + pmd_index(addr);
  67
  68                 if (!pmd_present(*pmd))
  69                         set_pmd(pmd, __pmd(addr | pmd_flag));
  70         }
  71 }
  72 static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
  73                           unsigned long addr, unsigned long end)
  74 {
  75         unsigned long next;
  76
  77         for (; addr < end; addr = next) {
  78                 pud_t *pud = pud_page + pud_index(addr);
  79                 pmd_t *pmd;
  80
  81                 next = (addr & PUD_MASK) + PUD_SIZE;
  82                 if (next > end)
  83                         next = end;
  84
  85                 if (pud_present(*pud)) {
  86                         pmd = pmd_offset(pud, 0);
  87                         ident_pmd_init(info->pmd_flag, pmd, addr, next);
  88                         continue;
  89                 }
  90                 pmd = (pmd_t *)info->alloc_pgt_page(info->context);
  91                 if (!pmd)
  92                         return -ENOMEM;
  93                 ident_pmd_init(info->pmd_flag, pmd, addr, next);
  94                 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
  95         }
  96
  97         return 0;
  98 }
  99
 100 int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
 101                               unsigned long addr, unsigned long end)
 102 {
 103         unsigned long next;
 104         int result;
 105         int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0;
 106
 107         for (; addr < end; addr = next) {
 108                 pgd_t *pgd = pgd_page + pgd_index(addr) + off;
 109                 pud_t *pud;
 110
 111                 next = (addr & PGDIR_MASK) + PGDIR_SIZE;
 112                 if (next > end)
 113                         next = end;
 114
 115                 if (pgd_present(*pgd)) {
 116                         pud = pud_offset(pgd, 0);
 117                         result = ident_pud_init(info, pud, addr, next);
 118                         if (result)
 119                                 return result;
 120                         continue;
 121                 }
 122
 123                 pud = (pud_t *)info->alloc_pgt_page(info->context);
 124                 if (!pud)
 125                         return -ENOMEM;
 126                 result = ident_pud_init(info, pud, addr, next);
 127                 if (result)
 128                         return result;
 129                 set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
 130         }
 131
 132         return 0;
 133 }
 134
 135 /*
 136  * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
 137  * physical space so we can cache the place of the first one and move
 138  * around without checking the pgd every time.
 139  */
 140
 141 pteval_t __supported_pte_mask __read_mostly = ~0;
 142 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 143
 144 int force_personality32;
 145
 146 /*
 147  * noexec32=on|off
 148  * Control non executable heap for 32bit processes.
 149  * To control the stack too use noexec=off
 150  *
 151  * on   PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
 152  * off  PROT_READ implies PROT_EXEC
 153  */
 154 static int __init nonx32_setup(char *str)
 155 {
 156         if (!strcmp(str, "on"))
 157                 force_personality32 &= ~READ_IMPLIES_EXEC;
 158         else if (!strcmp(str, "off"))
 159                 force_personality32 |= READ_IMPLIES_EXEC;
 160         return 1;
 161 }
 162 __setup("noexec32=", nonx32_setup);
 163
 164 /*
 165  * When memory was added/removed make sure all the processes MM have
 166  * suitable PGD entries in the local PGD level page.
 167  */
 168 void sync_global_pgds(unsigned long start, unsigned long end, int removed)
 169 {
 170         unsigned long address;
 171
 172         for (address = start; address <= end; address += PGDIR_SIZE) {
 173                 const pgd_t *pgd_ref = pgd_offset_k(address);
 174                 struct page *page;
 175
 176                 /*
 177                  * When it is called after memory hot remove, pgd_none()
 178                  * returns true. In this case (removed == 1), we must clear
 179                  * the PGD entries in the local PGD level page.
 180                  */
 181                 if (pgd_none(*pgd_ref) && !removed)
 182                         continue;
 183
 184                 spin_lock(&pgd_lock);
 185                 list_for_each_entry(page, &pgd_list, lru) {
 186                         pgd_t *pgd;
 187                         spinlock_t *pgt_lock;
 188
 189                         pgd = (pgd_t *)page_address(page) + pgd_index(address);
 190                         /* the pgt_lock only for Xen */
 191                         pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
 192                         spin_lock(pgt_lock);
 193
 194                         if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
 195                                 BUG_ON(pgd_page_vaddr(*pgd)
 196                                        != pgd_page_vaddr(*pgd_ref));
 197
 198                         if (removed) {
 199                                 if (pgd_none(*pgd_ref) && !pgd_none(*pgd))
 200                                         pgd_clear(pgd);
 201                         } else {
 202                                 if (pgd_none(*pgd))
 203                                         set_pgd(pgd, *pgd_ref);
 204                         }
 205
 206                         spin_unlock(pgt_lock);
 207                 }
 208                 spin_unlock(&pgd_lock);
 209         }
 210 }
 211
 212 /*
 213  * NOTE: This function is marked __ref because it calls __init function
 214  * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
 215  */
 216 static __ref void *spp_getpage(void)
 217 {
 218         void *ptr;
 219
 220         if (after_bootmem)
 221                 ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
 222         else
 223                 ptr = alloc_bootmem_pages(PAGE_SIZE);
 224
 225         if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
 226                 panic("set_pte_phys: cannot allocate page data %s\n",
 227                         after_bootmem ? "after bootmem" : "");
 228         }
 229
 230         pr_debug("spp_getpage %p\n", ptr);
 231
 232         return ptr;
 233 }
 234
 235 static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
 236 {
 237         if (pgd_none(*pgd)) {
 238                 pud_t *pud = (pud_t *)spp_getpage();
 239                 pgd_populate(&init_mm, pgd, pud);
 240                 if (pud != pud_offset(pgd, 0))
 241                         printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
 242                                pud, pud_offset(pgd, 0));
 243         }
 244         return pud_offset(pgd, vaddr);
 245 }
 246
 247 static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
 248 {
 249         if (pud_none(*pud)) {
 250                 pmd_t *pmd = (pmd_t *) spp_getpage();
 251                 pud_populate(&init_mm, pud, pmd);
 252                 if (pmd != pmd_offset(pud, 0))
 253                         printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
 254                                pmd, pmd_offset(pud, 0));
 255         }
 256         return pmd_offset(pud, vaddr);
 257 }
 258
 259 static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
 260 {
 261         if (pmd_none(*pmd)) {
 262                 pte_t *pte = (pte_t *) spp_getpage();
 263                 pmd_populate_kernel(&init_mm, pmd, pte);
 264                 if (pte != pte_offset_kernel(pmd, 0))
 265                         printk(KERN_ERR "PAGETABLE BUG #02!\n");
 266         }
 267         return pte_offset_kernel(pmd, vaddr);
 268 }
 269
 270 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
 271 {
 272         pud_t *pud;
 273         pmd_t *pmd;
 274         pte_t *pte;
 275
 276         pud = pud_page + pud_index(vaddr);
 277         pmd = fill_pmd(pud, vaddr);
 278         pte = fill_pte(pmd, vaddr);
 279
 280         set_pte(pte, new_pte);
 281
 282         /*
 283          * It's enough to flush this one mapping.
 284          * (PGE mappings get flushed as well)
 285          */
 286         __flush_tlb_one(vaddr);
 287 }
 288
 289 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 290 {
 291         pgd_t *pgd;
 292         pud_t *pud_page;
 293
 294         pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
 295
 296         pgd = pgd_offset_k(vaddr);
 297         if (pgd_none(*pgd)) {
 298                 printk(KERN_ERR
 299                         "PGD FIXMAP MISSING, it should be setup in head.S!\n");
 300                 return;
 301         }
 302         pud_page = (pud_t*)pgd_page_vaddr(*pgd);
 303         set_pte_vaddr_pud(pud_page, vaddr, pteval);
 304 }
 305
 306 pmd_t * __init populate_extra_pmd(unsigned long vaddr)
 307 {
 308         pgd_t *pgd;
 309         pud_t *pud;
 310
 311         pgd = pgd_offset_k(vaddr);
 312         pud = fill_pud(pgd, vaddr);
 313         return fill_pmd(pud, vaddr);
 314 }
 315
 316 pte_t * __init populate_extra_pte(unsigned long vaddr)
 317 {
 318         pmd_t *pmd;
 319
 320         pmd = populate_extra_pmd(vaddr);
 321         return fill_pte(pmd, vaddr);
 322 }
 323
 324 /*
 325  * Create large page table mappings for a range of physical addresses.
 326  */
 327 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
 328                                         enum page_cache_mode cache)
 329 {
 330         pgd_t *pgd;
 331         pud_t *pud;
 332         pmd_t *pmd;
 333         pgprot_t prot;
 334
 335         pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
 336                 pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache)));
 337         BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
 338         for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
 339                 pgd = pgd_offset_k((unsigned long)__va(phys));
 340                 if (pgd_none(*pgd)) {
 341                         pud = (pud_t *) spp_getpage();
 342                         set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
 343                                                 _PAGE_USER));
 344                 }
 345                 pud = pud_offset(pgd, (unsigned long)__va(phys));
 346                 if (pud_none(*pud)) {
 347                         pmd = (pmd_t *) spp_getpage();
 348                         set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
 349                                                 _PAGE_USER));
 350                 }
 351                 pmd = pmd_offset(pud, phys);
 352                 BUG_ON(!pmd_none(*pmd));
 353                 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
 354         }
 355 }
 356
 357 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
 358 {
 359         __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
 360 }
 361
 362 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
 363 {
 364         __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
 365 }
 366
 367 /*
 368  * The head.S code sets up the kernel high mapping:
 369  *
 370  *   from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
 371  *
 372  * phys_base holds the negative offset to the kernel, which is added
 373  * to the compile time generated pmds. This results in invalid pmds up
 374  * to the point where we hit the physaddr 0 mapping.
 375  *
 376  * We limit the mappings to the region from _text to _brk_end.  _brk_end
 377  * is rounded up to the 2MB boundary. This catches the invalid pmds as
 378  * well, as they are located before _text:
 379  */
 380 void __init cleanup_highmap(void)
 381 {
 382         unsigned long vaddr = __START_KERNEL_map;
 383         unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
 384         unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
 385         pmd_t *pmd = level2_kernel_pgt;
 386
 387         /*
 388          * Native path, max_pfn_mapped is not set yet.
 389          * Xen has valid max_pfn_mapped set in
 390          *      arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
 391          */
 392         if (max_pfn_mapped)
 393                 vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
 394
 395         for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
 396                 if (pmd_none(*pmd))
 397                         continue;
 398                 if (vaddr < (unsigned long) _text || vaddr > end)
 399                         set_pmd(pmd, __pmd(0));
 400         }
 401 }
 402
 403 static unsigned long __meminit
 404 phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
 405               pgprot_t prot)
 406 {
 407         unsigned long pages = 0, next;
 408         unsigned long last_map_addr = end;
 409         int i;
 410
 411         pte_t *pte = pte_page + pte_index(addr);
 412
 413         for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) {
 414                 next = (addr & PAGE_MASK) + PAGE_SIZE;
 415                 if (addr >= end) {
 416                         if (!after_bootmem &&
 417                             !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) &&
 418                             !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN))
 419                                 set_pte(pte, __pte(0));
 420                         continue;
 421                 }
 422
 423                 /*
 424                  * We will re-use the existing mapping.
 425                  * Xen for example has some special requirements, like mapping
 426                  * pagetable pages as RO. So assume someone who pre-setup
 427                  * these mappings are more intelligent.
 428                  */
 429                 if (pte_val(*pte)) {
 430                         if (!after_bootmem)
 431                                 pages++;
 432                         continue;
 433                 }
 434
 435                 if (0)
 436                         printk("   pte=%p addr=%lx pte=%016lx\n",
 437                                pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte);
 438                 pages++;
 439                 set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot));
 440                 last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE;
 441         }
 442
 443         update_page_count(PG_LEVEL_4K, pages);
 444
 445         return last_map_addr;
 446 }
 447
 448 static unsigned long __meminit
 449 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
 450               unsigned long page_size_mask, pgprot_t prot)
 451 {
 452         unsigned long pages = 0, next;
 453         unsigned long last_map_addr = end;
 454
 455         int i = pmd_index(address);
 456
 457         for (; i < PTRS_PER_PMD; i++, address = next) {
 458                 pmd_t *pmd = pmd_page + pmd_index(address);
 459                 pte_t *pte;
 460                 pgprot_t new_prot = prot;
 461
 462                 next = (address & PMD_MASK) + PMD_SIZE;
 463                 if (address >= end) {
 464                         if (!after_bootmem &&
 465                             !e820_any_mapped(address & PMD_MASK, next, E820_RAM) &&
 466                             !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN))
 467                                 set_pmd(pmd, __pmd(0));
 468                         continue;
 469                 }
 470
 471                 if (pmd_val(*pmd)) {
 472                         if (!pmd_large(*pmd)) {
 473                                 spin_lock(&init_mm.page_table_lock);
 474                                 pte = (pte_t *)pmd_page_vaddr(*pmd);
 475                                 last_map_addr = phys_pte_init(pte, address,
 476                                                                 end, prot);
 477                                 spin_unlock(&init_mm.page_table_lock);
 478                                 continue;
 479                         }
 480                         /*
 481                          * If we are ok with PG_LEVEL_2M mapping, then we will
 482                          * use the existing mapping,
 483                          *
 484                          * Otherwise, we will split the large page mapping but
 485                          * use the same existing protection bits except for
 486                          * large page, so that we don't violate Intel's TLB
 487                          * Application note (317080) which says, while changing
 488                          * the page sizes, new and old translations should
 489                          * not differ with respect to page frame and
 490                          * attributes.
 491                          */
 492                         if (page_size_mask & (1 << PG_LEVEL_2M)) {
 493                                 if (!after_bootmem)
 494                                         pages++;
 495                                 last_map_addr = next;
 496                                 continue;
 497                         }
 498                         new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
 499                 }
 500
 501                 if (page_size_mask & (1<<PG_LEVEL_2M)) {
 502                         pages++;
 503                         spin_lock(&init_mm.page_table_lock);
 504                         set_pte((pte_t *)pmd,
 505                                 pfn_pte((address & PMD_MASK) >> PAGE_SHIFT,
 506                                         __pgprot(pgprot_val(prot) | _PAGE_PSE)));
 507                         spin_unlock(&init_mm.page_table_lock);
 508                         last_map_addr = next;
 509                         continue;
 510                 }
 511
 512                 pte = alloc_low_page();
 513                 last_map_addr = phys_pte_init(pte, address, end, new_prot);
 514
 515                 spin_lock(&init_mm.page_table_lock);
 516                 pmd_populate_kernel(&init_mm, pmd, pte);
 517                 spin_unlock(&init_mm.page_table_lock);
 518         }
 519         update_page_count(PG_LEVEL_2M, pages);
 520         return last_map_addr;
 521 }
 522
 523 static unsigned long __meminit
 524 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
 525                          unsigned long page_size_mask)
 526 {
 527         unsigned long pages = 0, next;
 528         unsigned long last_map_addr = end;
 529         int i = pud_index(addr);
 530
 531         for (; i < PTRS_PER_PUD; i++, addr = next) {
 532                 pud_t *pud = pud_page + pud_index(addr);
 533                 pmd_t *pmd;
 534                 pgprot_t prot = PAGE_KERNEL;
 535
 536                 next = (addr & PUD_MASK) + PUD_SIZE;
 537                 if (addr >= end) {
 538                         if (!after_bootmem &&
 539                             !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) &&
 540                             !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN))
 541                                 set_pud(pud, __pud(0));
 542                         continue;
 543                 }
 544
 545                 if (pud_val(*pud)) {
 546                         if (!pud_large(*pud)) {
 547                                 pmd = pmd_offset(pud, 0);
 548                                 last_map_addr = phys_pmd_init(pmd, addr, end,
 549                                                          page_size_mask, prot);
 550                                 __flush_tlb_all();
 551                                 continue;
 552                         }
 553                         /*
 554                          * If we are ok with PG_LEVEL_1G mapping, then we will
 555                          * use the existing mapping.
 556                          *
 557                          * Otherwise, we will split the gbpage mapping but use
 558                          * the same existing protection  bits except for large
 559                          * page, so that we don't violate Intel's TLB
 560                          * Application note (317080) which says, while changing
 561                          * the page sizes, new and old translations should
 562                          * not differ with respect to page frame and
 563                          * attributes.
 564                          */
 565                         if (page_size_mask & (1 << PG_LEVEL_1G)) {
 566                                 if (!after_bootmem)
 567                                         pages++;
 568                                 last_map_addr = next;
 569                                 continue;
 570                         }
 571                         prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
 572                 }
 573
 574                 if (page_size_mask & (1<<PG_LEVEL_1G)) {
 575                         pages++;
 576                         spin_lock(&init_mm.page_table_lock);
 577                         set_pte((pte_t *)pud,
 578                                 pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT,
 579                                         PAGE_KERNEL_LARGE));
 580                         spin_unlock(&init_mm.page_table_lock);
 581                         last_map_addr = next;
 582                         continue;
 583                 }
 584
 585                 pmd = alloc_low_page();
 586                 last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
 587                                               prot);
 588
 589                 spin_lock(&init_mm.page_table_lock);
 590                 pud_populate(&init_mm, pud, pmd);
 591                 spin_unlock(&init_mm.page_table_lock);
 592         }
 593         __flush_tlb_all();
 594
 595         update_page_count(PG_LEVEL_1G, pages);
 596
 597         return last_map_addr;
 598 }
 599
 600 unsigned long __meminit
 601 kernel_physical_mapping_init(unsigned long start,
 602                              unsigned long end,
 603                              unsigned long page_size_mask)
 604 {
 605         bool pgd_changed = false;
 606         unsigned long next, last_map_addr = end;
 607         unsigned long addr;
 608
 609         start = (unsigned long)__va(start);
 610         end = (unsigned long)__va(end);
 611         addr = start;
 612
 613         for (; start < end; start = next) {
 614                 pgd_t *pgd = pgd_offset_k(start);
 615                 pud_t *pud;
 616
 617                 next = (start & PGDIR_MASK) + PGDIR_SIZE;
 618
 619                 if (pgd_val(*pgd)) {
 620                         pud = (pud_t *)pgd_page_vaddr(*pgd);
 621                         last_map_addr = phys_pud_init(pud, __pa(start),
 622                                                  __pa(end), page_size_mask);
 623                         continue;
 624                 }
 625
 626                 pud = alloc_low_page();
 627                 last_map_addr = phys_pud_init(pud, __pa(start), __pa(end),
 628                                                  page_size_mask);
 629
 630                 spin_lock(&init_mm.page_table_lock);
 631                 pgd_populate(&init_mm, pgd, pud);
 632                 spin_unlock(&init_mm.page_table_lock);
 633                 pgd_changed = true;
 634         }
 635
 636         if (pgd_changed)
 637                 sync_global_pgds(addr, end - 1, 0);
 638
 639         __flush_tlb_all();
 640
 641         return last_map_addr;
 642 }
 643
 644 #ifndef CONFIG_NUMA
 645 void __init initmem_init(void)
 646 {
 647         memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
 648 }
 649 #endif
 650
 651 void __init paging_init(void)
 652 {
 653         sparse_memory_present_with_active_regions(MAX_NUMNODES);
 654         sparse_init();
 655
 656         /*
 657          * clear the default setting with node 0
 658          * note: don't use nodes_clear here, that is really clearing when
 659          *       numa support is not compiled in, and later node_set_state
 660          *       will not set it back.
 661          */
 662         node_clear_state(0, N_MEMORY);
 663         if (N_MEMORY != N_NORMAL_MEMORY)
 664                 node_clear_state(0, N_NORMAL_MEMORY);
 665
 666         zone_sizes_init();
 667 }
 668
 669 /*
 670  * Memory hotplug specific functions
 671  */
 672 #ifdef CONFIG_MEMORY_HOTPLUG
 673 /*
 674  * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
 675  * updating.
 676  */
 677 static void  update_end_of_memory_vars(u64 start, u64 size)
 678 {
 679         unsigned long end_pfn = PFN_UP(start + size);
 680
 681         if (end_pfn > max_pfn) {
 682                 max_pfn = end_pfn;
 683                 max_low_pfn = end_pfn;
 684                 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 685         }
 686 }
 687
 688 /*
 689  * Memory is added always to NORMAL zone. This means you will never get
 690  * additional DMA/DMA32 memory.
 691  */
 692 int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
 693 {
 694         struct pglist_data *pgdat = NODE_DATA(nid);
 695         struct zone *zone = pgdat->node_zones +
 696                 zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
 697         unsigned long start_pfn = start >> PAGE_SHIFT;
 698         unsigned long nr_pages = size >> PAGE_SHIFT;
 699         int ret;
 700
 701         init_memory_mapping(start, start + size);
 702
 703         ret = __add_pages(nid, zone, start_pfn, nr_pages);
 704         WARN_ON_ONCE(ret);
 705
 706         /* update max_pfn, max_low_pfn and high_memory */
 707         update_end_of_memory_vars(start, size);
 708
 709         return ret;
 710 }
 711 EXPORT_SYMBOL_GPL(arch_add_memory);
 712
 713 #define PAGE_INUSE 0xFD
 714
 715 static void __meminit free_pagetable(struct page *page, int order)
 716 {
 717         unsigned long magic;
 718         unsigned int nr_pages = 1 << order;
 719         struct vmem_altmap *altmap = to_vmem_altmap((unsigned long) page);
 720
 721         if (altmap) {
 722                 vmem_altmap_free(altmap, nr_pages);
 723                 return;
 724         }
 725
 726         /* bootmem page has reserved flag */
 727         if (PageReserved(page)) {
 728                 __ClearPageReserved(page);
 729
 730                 magic = (unsigned long)page->lru.next;
 731                 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
 732                         while (nr_pages--)
 733                                 put_page_bootmem(page++);
 734                 } else
 735                         while (nr_pages--)
 736                                 free_reserved_page(page++);
 737         } else
 738                 free_pages((unsigned long)page_address(page), order);
 739 }
 740
 741 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
 742 {
 743         pte_t *pte;
 744         int i;
 745
 746         for (i = 0; i < PTRS_PER_PTE; i++) {
 747                 pte = pte_start + i;
 748                 if (pte_val(*pte))
 749                         return;
 750         }
 751
 752         /* free a pte talbe */
 753         free_pagetable(pmd_page(*pmd), 0);
 754         spin_lock(&init_mm.page_table_lock);
 755         pmd_clear(pmd);
 756         spin_unlock(&init_mm.page_table_lock);
 757 }
 758
 759 static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
 760 {
 761         pmd_t *pmd;
 762         int i;
 763
 764         for (i = 0; i < PTRS_PER_PMD; i++) {
 765                 pmd = pmd_start + i;
 766                 if (pmd_val(*pmd))
 767                         return;
 768         }
 769
 770         /* free a pmd talbe */
 771         free_pagetable(pud_page(*pud), 0);
 772         spin_lock(&init_mm.page_table_lock);
 773         pud_clear(pud);
 774         spin_unlock(&init_mm.page_table_lock);
 775 }
 776
 777 /* Return true if pgd is changed, otherwise return false. */
 778 static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd)
 779 {
 780         pud_t *pud;
 781         int i;
 782
 783         for (i = 0; i < PTRS_PER_PUD; i++) {
 784                 pud = pud_start + i;
 785                 if (pud_val(*pud))
 786                         return false;
 787         }
 788
 789         /* free a pud table */
 790         free_pagetable(pgd_page(*pgd), 0);
 791         spin_lock(&init_mm.page_table_lock);
 792         pgd_clear(pgd);
 793         spin_unlock(&init_mm.page_table_lock);
 794
 795         return true;
 796 }
 797
 798 static void __meminit
 799 remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
 800                  bool direct)
 801 {
 802         unsigned long next, pages = 0;
 803         pte_t *pte;
 804         void *page_addr;
 805         phys_addr_t phys_addr;
 806
 807         pte = pte_start + pte_index(addr);
 808         for (; addr < end; addr = next, pte++) {
 809                 next = (addr + PAGE_SIZE) & PAGE_MASK;
 810                 if (next > end)
 811                         next = end;
 812
 813                 if (!pte_present(*pte))
 814                         continue;
 815
 816                 /*
 817                  * We mapped [0,1G) memory as identity mapping when
 818                  * initializing, in arch/x86/kernel/head_64.S. These
 819                  * pagetables cannot be removed.
 820                  */
 821                 phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
 822                 if (phys_addr < (phys_addr_t)0x40000000)
 823                         return;
 824
 825                 if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) {
 826                         /*
 827                          * Do not free direct mapping pages since they were
 828                          * freed when offlining, or simplely not in use.
 829                          */
 830                         if (!direct)
 831                                 free_pagetable(pte_page(*pte), 0);
 832
 833                         spin_lock(&init_mm.page_table_lock);
 834                         pte_clear(&init_mm, addr, pte);
 835                         spin_unlock(&init_mm.page_table_lock);
 836
 837                         /* For non-direct mapping, pages means nothing. */
 838                         pages++;
 839                 } else {
 840                         /*
 841                          * If we are here, we are freeing vmemmap pages since
 842                          * direct mapped memory ranges to be freed are aligned.
 843                          *
 844                          * If we are not removing the whole page, it means
 845                          * other page structs in this page are being used and
 846                          * we canot remove them. So fill the unused page_structs
 847                          * with 0xFD, and remove the page when it is wholly
 848                          * filled with 0xFD.
 849                          */
 850                         memset((void *)addr, PAGE_INUSE, next - addr);
 851
 852                         page_addr = page_address(pte_page(*pte));
 853                         if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
 854                                 free_pagetable(pte_page(*pte), 0);
 855
 856                                 spin_lock(&init_mm.page_table_lock);
 857                                 pte_clear(&init_mm, addr, pte);
 858                                 spin_unlock(&init_mm.page_table_lock);
 859                         }
 860                 }
 861         }
 862
 863         /* Call free_pte_table() in remove_pmd_table(). */
 864         flush_tlb_all();
 865         if (direct)
 866                 update_page_count(PG_LEVEL_4K, -pages);
 867 }
 868
 869 static void __meminit
 870 remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
 871                  bool direct)
 872 {
 873         unsigned long next, pages = 0;
 874         pte_t *pte_base;
 875         pmd_t *pmd;
 876         void *page_addr;
 877
 878         pmd = pmd_start + pmd_index(addr);
 879         for (; addr < end; addr = next, pmd++) {
 880                 next = pmd_addr_end(addr, end);
 881
 882                 if (!pmd_present(*pmd))
 883                         continue;
 884
 885                 if (pmd_large(*pmd)) {
 886                         if (IS_ALIGNED(addr, PMD_SIZE) &&
 887                             IS_ALIGNED(next, PMD_SIZE)) {
 888                                 if (!direct)
 889                                         free_pagetable(pmd_page(*pmd),
 890                                                        get_order(PMD_SIZE));
 891
 892                                 spin_lock(&init_mm.page_table_lock);
 893                                 pmd_clear(pmd);
 894                                 spin_unlock(&init_mm.page_table_lock);
 895                                 pages++;
 896                         } else {
 897                                 /* If here, we are freeing vmemmap pages. */
 898                                 memset((void *)addr, PAGE_INUSE, next - addr);
 899
 900                                 page_addr = page_address(pmd_page(*pmd));
 901                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 902                                                 PMD_SIZE)) {
 903                                         free_pagetable(pmd_page(*pmd),
 904                                                        get_order(PMD_SIZE));
 905
 906                                         spin_lock(&init_mm.page_table_lock);
 907                                         pmd_clear(pmd);
 908                                         spin_unlock(&init_mm.page_table_lock);
 909                                 }
 910                         }
 911
 912                         continue;
 913                 }
 914
 915                 pte_base = (pte_t *)pmd_page_vaddr(*pmd);
 916                 remove_pte_table(pte_base, addr, next, direct);
 917                 free_pte_table(pte_base, pmd);
 918         }
 919
 920         /* Call free_pmd_table() in remove_pud_table(). */
 921         if (direct)
 922                 update_page_count(PG_LEVEL_2M, -pages);
 923 }
 924
 925 static void __meminit
 926 remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
 927                  bool direct)
 928 {
 929         unsigned long next, pages = 0;
 930         pmd_t *pmd_base;
 931         pud_t *pud;
 932         void *page_addr;
 933
 934         pud = pud_start + pud_index(addr);
 935         for (; addr < end; addr = next, pud++) {
 936                 next = pud_addr_end(addr, end);
 937
 938                 if (!pud_present(*pud))
 939                         continue;
 940
 941                 if (pud_large(*pud)) {
 942                         if (IS_ALIGNED(addr, PUD_SIZE) &&
 943                             IS_ALIGNED(next, PUD_SIZE)) {
 944                                 if (!direct)
 945                                         free_pagetable(pud_page(*pud),
 946                                                        get_order(PUD_SIZE));
 947
 948                                 spin_lock(&init_mm.page_table_lock);
 949                                 pud_clear(pud);
 950                                 spin_unlock(&init_mm.page_table_lock);
 951                                 pages++;
 952                         } else {
 953                                 /* If here, we are freeing vmemmap pages. */
 954                                 memset((void *)addr, PAGE_INUSE, next - addr);
 955
 956                                 page_addr = page_address(pud_page(*pud));
 957                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 958                                                 PUD_SIZE)) {
 959                                         free_pagetable(pud_page(*pud),
 960                                                        get_order(PUD_SIZE));
 961
 962                                         spin_lock(&init_mm.page_table_lock);
 963                                         pud_clear(pud);
 964                                         spin_unlock(&init_mm.page_table_lock);
 965                                 }
 966                         }
 967
 968                         continue;
 969                 }
 970
 971                 pmd_base = (pmd_t *)pud_page_vaddr(*pud);
 972                 remove_pmd_table(pmd_base, addr, next, direct);
 973                 free_pmd_table(pmd_base, pud);
 974         }
 975
 976         if (direct)
 977                 update_page_count(PG_LEVEL_1G, -pages);
 978 }
 979
 980 /* start and end are both virtual address. */
 981 static void __meminit
 982 remove_pagetable(unsigned long start, unsigned long end, bool direct)
 983 {
 984         unsigned long next;
 985         unsigned long addr;
 986         pgd_t *pgd;
 987         pud_t *pud;
 988         bool pgd_changed = false;
 989
 990         for (addr = start; addr < end; addr = next) {
 991                 next = pgd_addr_end(addr, end);
 992
 993                 pgd = pgd_offset_k(addr);
 994                 if (!pgd_present(*pgd))
 995                         continue;
 996
 997                 pud = (pud_t *)pgd_page_vaddr(*pgd);
 998                 remove_pud_table(pud, addr, next, direct);
 999                 if (free_pud_table(pud, pgd))
1000                         pgd_changed = true;
1001         }
1002
1003         if (pgd_changed)
1004                 sync_global_pgds(start, end - 1, 1);
1005
1006         flush_tlb_all();
1007 }
1008
1009 void __ref vmemmap_free(unsigned long start, unsigned long end)
1010 {
1011         remove_pagetable(start, end, false);
1012 }
1013
1014 #ifdef CONFIG_MEMORY_HOTREMOVE
1015 static void __meminit
1016 kernel_physical_mapping_remove(unsigned long start, unsigned long end)
1017 {
1018         start = (unsigned long)__va(start);
1019         end = (unsigned long)__va(end);
1020
1021         remove_pagetable(start, end, true);
1022 }
1023
1024 int __ref arch_remove_memory(u64 start, u64 size)
1025 {
1026         unsigned long start_pfn = start >> PAGE_SHIFT;
1027         unsigned long nr_pages = size >> PAGE_SHIFT;
1028         struct page *page = pfn_to_page(start_pfn);
1029         struct vmem_altmap *altmap;
1030         struct zone *zone;
1031         int ret;
1032
1033         /* With altmap the first mapped page is offset from @start */
1034         altmap = to_vmem_altmap((unsigned long) page);
1035         if (altmap)
1036                 page += vmem_altmap_offset(altmap);
1037         zone = page_zone(page);
1038         ret = __remove_pages(zone, start_pfn, nr_pages);
1039         WARN_ON_ONCE(ret);
1040         kernel_physical_mapping_remove(start, start + size);
1041
1042         return ret;
1043 }
1044 #endif
1045 #endif /* CONFIG_MEMORY_HOTPLUG */
1046
1047 static struct kcore_list kcore_vsyscall;
1048
1049 static void __init register_page_bootmem_info(void)
1050 {
1051 #ifdef CONFIG_NUMA
1052         int i;
1053
1054         for_each_online_node(i)
1055                 register_page_bootmem_info_node(NODE_DATA(i));
1056 #endif
1057 }
1058
1059 void __init mem_init(void)
1060 {
1061         pci_iommu_alloc();
1062
1063         /* clear_bss() already clear the empty_zero_page */
1064
1065         register_page_bootmem_info();
1066
1067         /* this will put all memory onto the freelists */
1068         free_all_bootmem();
1069         after_bootmem = 1;
1070
1071         /* Register memory areas for /proc/kcore */
1072         kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
1073                          PAGE_SIZE, KCORE_OTHER);
1074
1075         mem_init_print_info(NULL);
1076 }
1077
1078 #ifdef CONFIG_DEBUG_RODATA
1079 const int rodata_test_data = 0xC3;
1080 EXPORT_SYMBOL_GPL(rodata_test_data);
1081
1082 int kernel_set_to_readonly;
1083
1084 void set_kernel_text_rw(void)
1085 {
1086         unsigned long start = PFN_ALIGN(_text);
1087         unsigned long end = PFN_ALIGN(__stop___ex_table);
1088
1089         if (!kernel_set_to_readonly)
1090                 return;
1091
1092         pr_debug("Set kernel text: %lx - %lx for read write\n",
1093                  start, end);
1094
1095         /*
1096          * Make the kernel identity mapping for text RW. Kernel text
1097          * mapping will always be RO. Refer to the comment in
1098          * static_protections() in pageattr.c
1099          */
1100         set_memory_rw(start, (end - start) >> PAGE_SHIFT);
1101 }
1102
1103 void set_kernel_text_ro(void)
1104 {
1105         unsigned long start = PFN_ALIGN(_text);
1106         unsigned long end = PFN_ALIGN(__stop___ex_table);
1107
1108         if (!kernel_set_to_readonly)
1109                 return;
1110
1111         pr_debug("Set kernel text: %lx - %lx for read only\n",
1112                  start, end);
1113
1114         /*
1115          * Set the kernel identity mapping for text RO.
1116          */
1117         set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1118 }
1119
1120 void mark_rodata_ro(void)
1121 {
1122         unsigned long start = PFN_ALIGN(_text);
1123         unsigned long rodata_start = PFN_ALIGN(__start_rodata);
1124         unsigned long end = (unsigned long) &__end_rodata_hpage_align;
1125         unsigned long text_end = PFN_ALIGN(&__stop___ex_table);
1126         unsigned long rodata_end = PFN_ALIGN(&__end_rodata);
1127         unsigned long all_end;
1128
1129         printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
1130                (end - start) >> 10);
1131         set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1132
1133         kernel_set_to_readonly = 1;
1134
1135         /*
1136          * The rodata/data/bss/brk section (but not the kernel text!)
1137          * should also be not-executable.
1138          *
1139          * We align all_end to PMD_SIZE because the existing mapping
1140          * is a full PMD. If we would align _brk_end to PAGE_SIZE we
1141          * split the PMD and the reminder between _brk_end and the end
1142          * of the PMD will remain mapped executable.
1143          *
1144          * Any PMD which was setup after the one which covers _brk_end
1145          * has been zapped already via cleanup_highmem().
1146          */
1147         all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
1148         set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT);
1149
1150         rodata_test();
1151
1152 #ifdef CONFIG_CPA_DEBUG
1153         printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
1154         set_memory_rw(start, (end-start) >> PAGE_SHIFT);
1155
1156         printk(KERN_INFO "Testing CPA: again\n");
1157         set_memory_ro(start, (end-start) >> PAGE_SHIFT);
1158 #endif
1159
1160         free_init_pages("unused kernel",
1161                         (unsigned long) __va(__pa_symbol(text_end)),
1162                         (unsigned long) __va(__pa_symbol(rodata_start)));
1163         free_init_pages("unused kernel",
1164                         (unsigned long) __va(__pa_symbol(rodata_end)),
1165                         (unsigned long) __va(__pa_symbol(_sdata)));
1166
1167         debug_checkwx();
1168 }
1169
1170 #endif
1171
1172 int kern_addr_valid(unsigned long addr)
1173 {
1174         unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
1175         pgd_t *pgd;
1176         pud_t *pud;
1177         pmd_t *pmd;
1178         pte_t *pte;
1179
1180         if (above != 0 && above != -1UL)
1181                 return 0;
1182
1183         pgd = pgd_offset_k(addr);
1184         if (pgd_none(*pgd))
1185                 return 0;
1186
1187         pud = pud_offset(pgd, addr);
1188         if (pud_none(*pud))
1189                 return 0;
1190
1191         if (pud_large(*pud))
1192                 return pfn_valid(pud_pfn(*pud));
1193
1194         pmd = pmd_offset(pud, addr);
1195         if (pmd_none(*pmd))
1196                 return 0;
1197
1198         if (pmd_large(*pmd))
1199                 return pfn_valid(pmd_pfn(*pmd));
1200
1201         pte = pte_offset_kernel(pmd, addr);
1202         if (pte_none(*pte))
1203                 return 0;
1204
1205         return pfn_valid(pte_pfn(*pte));
1206 }
1207
1208 static unsigned long probe_memory_block_size(void)
1209 {
1210         unsigned long bz = MIN_MEMORY_BLOCK_SIZE;
1211
1212         /* if system is UV or has 64GB of RAM or more, use large blocks */
1213         if (is_uv_system() || ((max_pfn << PAGE_SHIFT) >= (64UL << 30)))
1214                 bz = 2UL << 30; /* 2GB */
1215
1216         pr_info("x86/mm: 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, struct vmem_altmap *altmap)
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, altmap);
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                                                 pr_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                         } else if (altmap)
1284                                 return -ENOMEM; /* no fallback */
1285                 } else if (pmd_large(*pmd)) {
1286                         vmemmap_verify((pte_t *)pmd, node, addr, next);
1287                         continue;
1288                 }
1289                 pr_warn_once("vmemmap: falling back to regular page backing\n");
1290                 if (vmemmap_populate_basepages(addr, next, node))
1291                         return -ENOMEM;
1292         }
1293         return 0;
1294 }
1295
1296 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
1297 {
1298         struct vmem_altmap *altmap = to_vmem_altmap(start);
1299         int err;
1300
1301         if (cpu_has_pse)
1302                 err = vmemmap_populate_hugepages(start, end, node, altmap);
1303         else if (altmap) {
1304                 pr_err_once("%s: no cpu support for altmap allocations\n",
1305                                 __func__);
1306                 err = -ENOMEM;
1307         } else
1308                 err = vmemmap_populate_basepages(start, end, node);
1309         if (!err)
1310                 sync_global_pgds(start, end - 1, 0);
1311         return err;
1312 }
1313
1314 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
1315 void register_page_bootmem_memmap(unsigned long section_nr,
1316                                   struct page *start_page, unsigned long size)
1317 {
1318         unsigned long addr = (unsigned long)start_page;
1319         unsigned long end = (unsigned long)(start_page + size);
1320         unsigned long next;
1321         pgd_t *pgd;
1322         pud_t *pud;
1323         pmd_t *pmd;
1324         unsigned int nr_pages;
1325         struct page *page;
1326
1327         for (; addr < end; addr = next) {
1328                 pte_t *pte = NULL;
1329
1330                 pgd = pgd_offset_k(addr);
1331                 if (pgd_none(*pgd)) {
1332                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1333                         continue;
1334                 }
1335                 get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
1336
1337                 pud = pud_offset(pgd, addr);
1338                 if (pud_none(*pud)) {
1339                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1340                         continue;
1341                 }
1342                 get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
1343
1344                 if (!cpu_has_pse) {
1345                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1346                         pmd = pmd_offset(pud, addr);
1347                         if (pmd_none(*pmd))
1348                                 continue;
1349                         get_page_bootmem(section_nr, pmd_page(*pmd),
1350                                          MIX_SECTION_INFO);
1351
1352                         pte = pte_offset_kernel(pmd, addr);
1353                         if (pte_none(*pte))
1354                                 continue;
1355                         get_page_bootmem(section_nr, pte_page(*pte),
1356                                          SECTION_INFO);
1357                 } else {
1358                         next = pmd_addr_end(addr, end);
1359
1360                         pmd = pmd_offset(pud, addr);
1361                         if (pmd_none(*pmd))
1362                                 continue;
1363
1364                         nr_pages = 1 << (get_order(PMD_SIZE));
1365                         page = pmd_page(*pmd);
1366                         while (nr_pages--)
1367                                 get_page_bootmem(section_nr, page++,
1368                                                  SECTION_INFO);
1369                 }
1370         }
1371 }
1372 #endif
1373
1374 void __meminit vmemmap_populate_print_last(void)
1375 {
1376         if (p_start) {
1377                 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1378                         addr_start, addr_end-1, p_start, p_end-1, node_start);
1379                 p_start = NULL;
1380                 p_end = NULL;
1381                 node_start = 0;
1382         }
1383 }
1384 #endif