LXR linux/include/asm-x86

   1#ifndef _X86_64_PGTABLE_H
   2#define _X86_64_PGTABLE_H
   3
   4#include <linux/const.h>
   5#ifndef __ASSEMBLY__
   6
   7/*
   8 * This file contains the functions and defines necessary to modify and use
   9 * the x86-64 page table tree.
  10 */
  11#include <asm/processor.h>
  12#include <asm/bitops.h>
  13#include <linux/threads.h>
  14#include <asm/pda.h>
  15
  16extern pud_t level3_kernel_pgt[512];
  17extern pud_t level3_ident_pgt[512];
  18extern pmd_t level2_kernel_pgt[512];
  19extern pgd_t init_level4_pgt[];
  20extern unsigned long __supported_pte_mask;
  21
  22#define swapper_pg_dir init_level4_pgt
  23
  24extern void paging_init(void);
  25extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
  26
  27/*
  28 * ZERO_PAGE is a global shared page that is always zero: used
  29 * for zero-mapped memory areas etc..
  30 */
  31extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
  32#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  33
  34#endif /* !__ASSEMBLY__ */
  35
  36/*
  37 * PGDIR_SHIFT determines what a top-level page table entry can map
  38 */
  39#define PGDIR_SHIFT     39
  40#define PTRS_PER_PGD    512
  41
  42/*
  43 * 3rd level page
  44 */
  45#define PUD_SHIFT       30
  46#define PTRS_PER_PUD    512
  47
  48/*
  49 * PMD_SHIFT determines the size of the area a middle-level
  50 * page table can map
  51 */
  52#define PMD_SHIFT       21
  53#define PTRS_PER_PMD    512
  54
  55/*
  56 * entries per page directory level
  57 */
  58#define PTRS_PER_PTE    512
  59
  60#ifndef __ASSEMBLY__
  61
  62#define pte_ERROR(e) \
  63        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
  64#define pmd_ERROR(e) \
  65        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
  66#define pud_ERROR(e) \
  67        printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
  68#define pgd_ERROR(e) \
  69        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
  70
  71#define pgd_none(x)     (!pgd_val(x))
  72#define pud_none(x)     (!pud_val(x))
  73
  74static inline void set_pte(pte_t *dst, pte_t val)
  75{
  76        pte_val(*dst) = pte_val(val);
  77} 
  78#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  79
  80static inline void set_pmd(pmd_t *dst, pmd_t val)
  81{
  82        pmd_val(*dst) = pmd_val(val); 
  83} 
  84
  85static inline void set_pud(pud_t *dst, pud_t val)
  86{
  87        pud_val(*dst) = pud_val(val);
  88}
  89
  90static inline void pud_clear (pud_t *pud)
  91{
  92        set_pud(pud, __pud(0));
  93}
  94
  95static inline void set_pgd(pgd_t *dst, pgd_t val)
  96{
  97        pgd_val(*dst) = pgd_val(val); 
  98} 
  99
 100static inline void pgd_clear (pgd_t * pgd)
 101{
 102        set_pgd(pgd, __pgd(0));
 103}
 104
 105#define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
 106
 107struct mm_struct;
 108
 109static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
 110{
 111        pte_t pte;
 112        if (full) {
 113                pte = *ptep;
 114                *ptep = __pte(0);
 115        } else {
 116                pte = ptep_get_and_clear(mm, addr, ptep);
 117        }
 118        return pte;
 119}
 120
 121#define pte_same(a, b)          ((a).pte == (b).pte)
 122
 123#define pte_pgprot(a)   (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
 124
 125#endif /* !__ASSEMBLY__ */
 126
 127#define PMD_SIZE        (_AC(1,UL) << PMD_SHIFT)
 128#define PMD_MASK        (~(PMD_SIZE-1))
 129#define PUD_SIZE        (_AC(1,UL) << PUD_SHIFT)
 130#define PUD_MASK        (~(PUD_SIZE-1))
 131#define PGDIR_SIZE      (_AC(1,UL) << PGDIR_SHIFT)
 132#define PGDIR_MASK      (~(PGDIR_SIZE-1))
 133
 134#define USER_PTRS_PER_PGD       ((TASK_SIZE-1)/PGDIR_SIZE+1)
 135#define FIRST_USER_ADDRESS      0
 136
 137#define MAXMEM           _AC(0x3fffffffffff, UL)
 138#define VMALLOC_START    _AC(0xffffc20000000000, UL)
 139#define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 140#define MODULES_VADDR    _AC(0xffffffff88000000, UL)
 141#define MODULES_END      _AC(0xfffffffffff00000, UL)
 142#define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 143
 144#define _PAGE_BIT_PRESENT       0
 145#define _PAGE_BIT_RW            1
 146#define _PAGE_BIT_USER          2
 147#define _PAGE_BIT_PWT           3
 148#define _PAGE_BIT_PCD           4
 149#define _PAGE_BIT_ACCESSED      5
 150#define _PAGE_BIT_DIRTY         6
 151#define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
 152#define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
 153#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
 154
 155#define _PAGE_PRESENT   0x001
 156#define _PAGE_RW        0x002
 157#define _PAGE_USER      0x004
 158#define _PAGE_PWT       0x008
 159#define _PAGE_PCD       0x010
 160#define _PAGE_ACCESSED  0x020
 161#define _PAGE_DIRTY     0x040
 162#define _PAGE_PSE       0x080   /* 2MB page */
 163#define _PAGE_FILE      0x040   /* nonlinear file mapping, saved PTE; unset:swap */
 164#define _PAGE_GLOBAL    0x100   /* Global TLB entry */
 165
 166#define _PAGE_PROTNONE  0x080   /* If not present */
 167#define _PAGE_NX        (_AC(1,UL)<<_PAGE_BIT_NX)
 168
 169#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 170#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
 171
 172#define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 173
 174#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 175#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
 176#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
 177#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
 178#define PAGE_COPY PAGE_COPY_NOEXEC
 179#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 180#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
 181#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 182#define __PAGE_KERNEL \
 183        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
 184#define __PAGE_KERNEL_EXEC \
 185        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
 186#define __PAGE_KERNEL_NOCACHE \
 187        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
 188#define __PAGE_KERNEL_RO \
 189        (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
 190#define __PAGE_KERNEL_VSYSCALL \
 191        (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 192#define __PAGE_KERNEL_VSYSCALL_NOCACHE \
 193        (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
 194#define __PAGE_KERNEL_LARGE \
 195        (__PAGE_KERNEL | _PAGE_PSE)
 196#define __PAGE_KERNEL_LARGE_EXEC \
 197        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 198
 199#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
 200
 201#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
 202#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
 203#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
 204#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 205#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
 206#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
 207#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
 208#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
 209
 210/*         xwr */
 211#define __P000  PAGE_NONE
 212#define __P001  PAGE_READONLY
 213#define __P010  PAGE_COPY
 214#define __P011  PAGE_COPY
 215#define __P100  PAGE_READONLY_EXEC
 216#define __P101  PAGE_READONLY_EXEC
 217#define __P110  PAGE_COPY_EXEC
 218#define __P111  PAGE_COPY_EXEC
 219
 220#define __S000  PAGE_NONE
 221#define __S001  PAGE_READONLY
 222#define __S010  PAGE_SHARED
 223#define __S011  PAGE_SHARED
 224#define __S100  PAGE_READONLY_EXEC
 225#define __S101  PAGE_READONLY_EXEC
 226#define __S110  PAGE_SHARED_EXEC
 227#define __S111  PAGE_SHARED_EXEC
 228
 229#ifndef __ASSEMBLY__
 230
 231static inline unsigned long pgd_bad(pgd_t pgd)
 232{
 233        return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 234}
 235
 236static inline unsigned long pud_bad(pud_t pud)
 237{
 238        return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 239}
 240
 241static inline unsigned long pmd_bad(pmd_t pmd)
 242{
 243        return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
 244}
 245
 246#define pte_none(x)     (!pte_val(x))
 247#define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 248#define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 249
 250#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
 251                                                   right? */
 252#define pte_page(x)     pfn_to_page(pte_pfn(x))
 253#define pte_pfn(x)  ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 254
 255static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 256{
 257        pte_t pte;
 258        pte_val(pte) = (page_nr << PAGE_SHIFT);
 259        pte_val(pte) |= pgprot_val(pgprot);
 260        pte_val(pte) &= __supported_pte_mask;
 261        return pte;
 262}
 263
 264/*
 265 * The following only work if pte_present() is true.
 266 * Undefined behaviour if not..
 267 */
 268#define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
 269static inline int pte_user(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
 270static inline int pte_read(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
 271static inline int pte_exec(pte_t pte)           { return !(pte_val(pte) & _PAGE_NX); }
 272static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 273static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 274static inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_RW; }
 275static inline int pte_file(pte_t pte)           { return pte_val(pte) & _PAGE_FILE; }
 276static inline int pte_huge(pte_t pte)           { return pte_val(pte) & _PAGE_PSE; }
 277
 278static inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 279static inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 280static inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 281static inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 282static inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
 283static inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 284static inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_NX)); return pte; }
 285static inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 286static inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 287static inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 288static inline pte_t pte_mkhuge(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; }
 289static inline pte_t pte_clrhuge(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_PSE)); return pte; }
 290
 291struct vm_area_struct;
 292
 293static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 294{
 295        if (!pte_dirty(*ptep))
 296                return 0;
 297        return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
 298}
 299
 300static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 301{
 302        if (!pte_young(*ptep))
 303                return 0;
 304        return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
 305}
 306
 307static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 308{
 309        clear_bit(_PAGE_BIT_RW, &ptep->pte);
 310}
 311
 312/*
 313 * Macro to mark a page protection value as "uncacheable".
 314 */
 315#define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
 316
 317static inline int pmd_large(pmd_t pte) { 
 318        return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE; 
 319}       
 320
 321
 322/*
 323 * Conversion functions: convert a page and protection to a page entry,
 324 * and a page entry and page directory to the page they refer to.
 325 */
 326
 327/*
 328 * Level 4 access.
 329 */
 330#define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
 331#define pgd_page(pgd)           (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
 332#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 333#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
 334#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
 335#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
 336#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
 337
 338/* PUD - Level3 access */
 339/* to find an entry in a page-table-directory. */
 340#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
 341#define pud_page(pud)           (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
 342#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 343#define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
 344#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
 345
 346/* PMD  - Level 2 access */
 347#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
 348#define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 349
 350#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 351#define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
 352                        pmd_index(address))
 353#define pmd_none(x)     (!pmd_val(x))
 354#define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 355#define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 356#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
 357#define pmd_pfn(x)  ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 358
 359#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 360#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
 361#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 362
 363/* PTE - Level 1 access. */
 364
 365/* page, protection -> pte */
 366#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 367#define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
 368 
 369/* Change flags of a PTE */
 370static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 371{ 
 372        pte_val(pte) &= _PAGE_CHG_MASK;
 373        pte_val(pte) |= pgprot_val(newprot);
 374        pte_val(pte) &= __supported_pte_mask;
 375       return pte; 
 376}
 377
 378#define pte_index(address) \
 379                (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 380#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
 381                        pte_index(address))
 382
 383/* x86-64 always has all page tables mapped. */
 384#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
 385#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
 386#define pte_unmap(pte) /* NOP */
 387#define pte_unmap_nested(pte) /* NOP */ 
 388
 389#define update_mmu_cache(vma,address,pte) do { } while (0)
 390
 391/* We only update the dirty/accessed state if we set
 392 * the dirty bit by hand in the kernel, since the hardware
 393 * will do the accessed bit for us, and we don't want to
 394 * race with other CPU's that might be updating the dirty
 395 * bit at the same time. */
 396#define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 397#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 398({                                                                        \
 399        int __changed = !pte_same(*(__ptep), __entry);                    \
 400        if (__changed && __dirty) {                                       \
 401                set_pte(__ptep, __entry);                                 \
 402                flush_tlb_page(__vma, __address);                         \
 403        }                                                                 \
 404        __changed;                                                        \
 405})
 406
 407/* Encode and de-code a swap entry */
 408#define __swp_type(x)                   (((x).val >> 1) & 0x3f)
 409#define __swp_offset(x)                 ((x).val >> 8)
 410#define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
 411#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 412#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 413
 414extern spinlock_t pgd_lock;
 415extern struct list_head pgd_list;
 416
 417extern int kern_addr_valid(unsigned long addr); 
 418
 419#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 420                remap_pfn_range(vma, vaddr, pfn, size, prot)
 421
 422#define HAVE_ARCH_UNMAPPED_AREA
 423
 424#define pgtable_cache_init()   do { } while (0)
 425#define check_pgt_cache()      do { } while (0)
 426
 427#define PAGE_AGP    PAGE_KERNEL_NOCACHE
 428#define HAVE_PAGE_AGP 1
 429
 430/* fs/proc/kcore.c */
 431#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 432#define kc_offset_to_vaddr(o) \
 433   (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
 434
 435#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 436#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 437#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 438#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 439#define __HAVE_ARCH_PTEP_SET_WRPROTECT
 440#define __HAVE_ARCH_PTE_SAME
 441#include <asm-generic/pgtable.h>
 442#endif /* !__ASSEMBLY__ */
 443
 444#endif /* _X86_64_PGTABLE_H */
 445