include/asm-x86_64/pgtable.h

   1 #ifndef _X86_64_PGTABLE_H
   2 #define _X86_64_PGTABLE_H
   3
   4 /*
   5  * This file contains the functions and defines necessary to modify and use
   6  * the x86-64 page table tree.
   7  */
   8 #include <asm/processor.h>
   9 #include <asm/fixmap.h>
  10 #include <asm/bitops.h>
  11 #include <linux/threads.h>
  12 #include <asm/pda.h>
  13
  14 extern pud_t level3_kernel_pgt[512];
  15 extern pud_t level3_physmem_pgt[512];
  16 extern pud_t level3_ident_pgt[512];
  17 extern pmd_t level2_kernel_pgt[512];
  18 extern pgd_t init_level4_pgt[];
  19 extern pgd_t boot_level4_pgt[];
  20 extern unsigned long __supported_pte_mask;
  21
  22 #define swapper_pg_dir init_level4_pgt
  23
  24 extern int nonx_setup(char *str);
  25 extern void paging_init(void);
  26 extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
  27
  28 extern unsigned long pgkern_mask;
  29
  30 /*
  31  * ZERO_PAGE is a global shared page that is always zero: used
  32  * for zero-mapped memory areas etc..
  33  */
  34 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
  35 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  36
  37 /*
  38  * PGDIR_SHIFT determines what a top-level page table entry can map
  39  */
  40 #define PGDIR_SHIFT     39
  41 #define PTRS_PER_PGD    512
  42
  43 /*
  44  * 3rd level page
  45  */
  46 #define PUD_SHIFT       30
  47 #define PTRS_PER_PUD    512
  48
  49 /*
  50  * PMD_SHIFT determines the size of the area a middle-level
  51  * page table can map
  52  */
  53 #define PMD_SHIFT       21
  54 #define PTRS_PER_PMD    512
  55
  56 /*
  57  * entries per page directory level
  58  */
  59 #define PTRS_PER_PTE    512
  60
  61 #define pte_ERROR(e) \
  62         printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
  63 #define pmd_ERROR(e) \
  64         printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
  65 #define pud_ERROR(e) \
  66         printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
  67 #define pgd_ERROR(e) \
  68         printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
  69
  70 #define pgd_none(x)     (!pgd_val(x))
  71 #define pud_none(x)     (!pud_val(x))
  72
  73 static inline void set_pte(pte_t *dst, pte_t val)
  74 {
  75         pte_val(*dst) = pte_val(val);
  76 }
  77 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  78
  79 static inline void set_pmd(pmd_t *dst, pmd_t val)
  80 {
  81         pmd_val(*dst) = pmd_val(val);
  82 }
  83
  84 static inline void set_pud(pud_t *dst, pud_t val)
  85 {
  86         pud_val(*dst) = pud_val(val);
  87 }
  88
  89 static inline void pud_clear (pud_t *pud)
  90 {
  91         set_pud(pud, __pud(0));
  92 }
  93
  94 static inline void set_pgd(pgd_t *dst, pgd_t val)
  95 {
  96         pgd_val(*dst) = pgd_val(val);
  97 }
  98
  99 static inline void pgd_clear (pgd_t * pgd)
 100 {
 101         set_pgd(pgd, __pgd(0));
 102 }
 103
 104 #define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
 105
 106 struct mm_struct;
 107
 108 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
 109 {
 110         pte_t pte;
 111         if (full) {
 112                 pte = *ptep;
 113                 *ptep = __pte(0);
 114         } else {
 115                 pte = ptep_get_and_clear(mm, addr, ptep);
 116         }
 117         return pte;
 118 }
 119
 120 #define pte_same(a, b)          ((a).pte == (b).pte)
 121
 122 #define pte_pgprot(a)   (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
 123
 124 #define PMD_SIZE        (1UL << PMD_SHIFT)
 125 #define PMD_MASK        (~(PMD_SIZE-1))
 126 #define PUD_SIZE        (1UL << PUD_SHIFT)
 127 #define PUD_MASK        (~(PUD_SIZE-1))
 128 #define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
 129 #define PGDIR_MASK      (~(PGDIR_SIZE-1))
 130
 131 #define USER_PTRS_PER_PGD       ((TASK_SIZE-1)/PGDIR_SIZE+1)
 132 #define FIRST_USER_ADDRESS      0
 133
 134 #ifndef __ASSEMBLY__
 135 #define MAXMEM           0x3fffffffffffUL
 136 #define VMALLOC_START    0xffffc20000000000UL
 137 #define VMALLOC_END      0xffffe1ffffffffffUL
 138 #define MODULES_VADDR    0xffffffff88000000UL
 139 #define MODULES_END      0xfffffffffff00000UL
 140 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 141
 142 #define _PAGE_BIT_PRESENT       0
 143 #define _PAGE_BIT_RW            1
 144 #define _PAGE_BIT_USER          2
 145 #define _PAGE_BIT_PWT           3
 146 #define _PAGE_BIT_PCD           4
 147 #define _PAGE_BIT_ACCESSED      5
 148 #define _PAGE_BIT_DIRTY         6
 149 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
 150 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
 151 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
 152
 153 #define _PAGE_PRESENT   0x001
 154 #define _PAGE_RW        0x002
 155 #define _PAGE_USER      0x004
 156 #define _PAGE_PWT       0x008
 157 #define _PAGE_PCD       0x010
 158 #define _PAGE_ACCESSED  0x020
 159 #define _PAGE_DIRTY     0x040
 160 #define _PAGE_PSE       0x080   /* 2MB page */
 161 #define _PAGE_FILE      0x040   /* nonlinear file mapping, saved PTE; unset:swap */
 162 #define _PAGE_GLOBAL    0x100   /* Global TLB entry */
 163
 164 #define _PAGE_PROTNONE  0x080   /* If not present */
 165 #define _PAGE_NX        (1UL<<_PAGE_BIT_NX)
 166
 167 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 168 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
 169
 170 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 171
 172 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 173 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
 174 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
 175 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
 176 #define PAGE_COPY PAGE_COPY_NOEXEC
 177 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 178 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
 179 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 180 #define __PAGE_KERNEL \
 181         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
 182 #define __PAGE_KERNEL_EXEC \
 183         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
 184 #define __PAGE_KERNEL_NOCACHE \
 185         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
 186 #define __PAGE_KERNEL_RO \
 187         (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
 188 #define __PAGE_KERNEL_VSYSCALL \
 189         (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 190 #define __PAGE_KERNEL_VSYSCALL_NOCACHE \
 191         (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
 192 #define __PAGE_KERNEL_LARGE \
 193         (__PAGE_KERNEL | _PAGE_PSE)
 194 #define __PAGE_KERNEL_LARGE_EXEC \
 195         (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 196
 197 #define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
 198
 199 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
 200 #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
 201 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
 202 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
 203 #define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
 204 #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
 205 #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
 206 #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
 207
 208 /*         xwr */
 209 #define __P000  PAGE_NONE
 210 #define __P001  PAGE_READONLY
 211 #define __P010  PAGE_COPY
 212 #define __P011  PAGE_COPY
 213 #define __P100  PAGE_READONLY_EXEC
 214 #define __P101  PAGE_READONLY_EXEC
 215 #define __P110  PAGE_COPY_EXEC
 216 #define __P111  PAGE_COPY_EXEC
 217
 218 #define __S000  PAGE_NONE
 219 #define __S001  PAGE_READONLY
 220 #define __S010  PAGE_SHARED
 221 #define __S011  PAGE_SHARED
 222 #define __S100  PAGE_READONLY_EXEC
 223 #define __S101  PAGE_READONLY_EXEC
 224 #define __S110  PAGE_SHARED_EXEC
 225 #define __S111  PAGE_SHARED_EXEC
 226
 227 static inline unsigned long pgd_bad(pgd_t pgd)
 228 {
 229        unsigned long val = pgd_val(pgd);
 230        val &= ~PTE_MASK;
 231        val &= ~(_PAGE_USER | _PAGE_DIRTY);
 232        return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);
 233 }
 234
 235 static inline unsigned long pud_bad(pud_t pud)
 236 {
 237        unsigned long val = pud_val(pud);
 238        val &= ~PTE_MASK;
 239        val &= ~(_PAGE_USER | _PAGE_DIRTY);
 240        return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);
 241 }
 242
 243 #define pte_none(x)     (!pte_val(x))
 244 #define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
 245 #define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 246
 247 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
 248                                                    right? */
 249 #define pte_page(x)     pfn_to_page(pte_pfn(x))
 250 #define pte_pfn(x)  ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 251
 252 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 253 {
 254         pte_t pte;
 255         pte_val(pte) = (page_nr << PAGE_SHIFT);
 256         pte_val(pte) |= pgprot_val(pgprot);
 257         pte_val(pte) &= __supported_pte_mask;
 258         return pte;
 259 }
 260
 261 /*
 262  * The following only work if pte_present() is true.
 263  * Undefined behaviour if not..
 264  */
 265 #define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
 266 static inline int pte_user(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
 267 static inline int pte_read(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
 268 static inline int pte_exec(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
 269 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 270 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 271 static inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_RW; }
 272 static inline int pte_file(pte_t pte)           { return pte_val(pte) & _PAGE_FILE; }
 273 static inline int pte_huge(pte_t pte)           { return pte_val(pte) & _PAGE_PSE; }
 274
 275 static inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 276 static inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
 277 static inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
 278 static inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
 279 static inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
 280 static inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 281 static inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
 282 static inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
 283 static inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
 284 static inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 285 static inline pte_t pte_mkhuge(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; }
 286
 287 struct vm_area_struct;
 288
 289 static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 290 {
 291         if (!pte_dirty(*ptep))
 292                 return 0;
 293         return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
 294 }
 295
 296 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
 297 {
 298         if (!pte_young(*ptep))
 299                 return 0;
 300         return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
 301 }
 302
 303 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 304 {
 305         clear_bit(_PAGE_BIT_RW, &ptep->pte);
 306 }
 307
 308 /*
 309  * Macro to mark a page protection value as "uncacheable".
 310  */
 311 #define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
 312
 313 static inline int pmd_large(pmd_t pte) {
 314         return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE;
 315 }
 316
 317
 318 /*
 319  * Conversion functions: convert a page and protection to a page entry,
 320  * and a page entry and page directory to the page they refer to.
 321  */
 322
 323 /*
 324  * Level 4 access.
 325  */
 326 #define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
 327 #define pgd_page(pgd)           (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
 328 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 329 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
 330 #define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
 331 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
 332 #define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
 333
 334 /* PUD - Level3 access */
 335 /* to find an entry in a page-table-directory. */
 336 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
 337 #define pud_page(pud)           (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
 338 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
 339 #define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
 340 #define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
 341
 342 /* PMD  - Level 2 access */
 343 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
 344 #define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 345
 346 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
 347 #define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
 348                         pmd_index(address))
 349 #define pmd_none(x)     (!pmd_val(x))
 350 #define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
 351 #define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
 352 #define pmd_bad(x)      ((pmd_val(x) & (~PTE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE )
 353 #define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
 354 #define pmd_pfn(x)  ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
 355
 356 #define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
 357 #define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
 358 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
 359
 360 /* PTE - Level 1 access. */
 361
 362 /* page, protection -> pte */
 363 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 364 #define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
 365
 366 /* physical address -> PTE */
 367 static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
 368 {
 369         pte_t pte;
 370         pte_val(pte) = physpage | pgprot_val(pgprot);
 371         return pte;
 372 }
 373
 374 /* Change flags of a PTE */
 375 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 376 {
 377         pte_val(pte) &= _PAGE_CHG_MASK;
 378         pte_val(pte) |= pgprot_val(newprot);
 379         pte_val(pte) &= __supported_pte_mask;
 380        return pte;
 381 }
 382
 383 #define pte_index(address) \
 384                 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 385 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
 386                         pte_index(address))
 387
 388 /* x86-64 always has all page tables mapped. */
 389 #define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
 390 #define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
 391 #define pte_unmap(pte) /* NOP */
 392 #define pte_unmap_nested(pte) /* NOP */
 393
 394 #define update_mmu_cache(vma,address,pte) do { } while (0)
 395
 396 /* We only update the dirty/accessed state if we set
 397  * the dirty bit by hand in the kernel, since the hardware
 398  * will do the accessed bit for us, and we don't want to
 399  * race with other CPU's that might be updating the dirty
 400  * bit at the same time. */
 401 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 402 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 403         do {                                                              \
 404                 if (__dirty) {                                            \
 405                         set_pte(__ptep, __entry);                         \
 406                         flush_tlb_page(__vma, __address);                 \
 407                 }                                                         \
 408         } while (0)
 409
 410 /* Encode and de-code a swap entry */
 411 #define __swp_type(x)                   (((x).val >> 1) & 0x3f)
 412 #define __swp_offset(x)                 ((x).val >> 8)
 413 #define __swp_entry(type, offset)       ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
 414 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 415 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 416
 417 extern spinlock_t pgd_lock;
 418 extern struct page *pgd_list;
 419 void vmalloc_sync_all(void);
 420
 421 #endif /* !__ASSEMBLY__ */
 422
 423 extern int kern_addr_valid(unsigned long addr);
 424
 425 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 426                 remap_pfn_range(vma, vaddr, pfn, size, prot)
 427
 428 #define MK_IOSPACE_PFN(space, pfn)      (pfn)
 429 #define GET_IOSPACE(pfn)                0
 430 #define GET_PFN(pfn)                    (pfn)
 431
 432 #define HAVE_ARCH_UNMAPPED_AREA
 433
 434 #define pgtable_cache_init()   do { } while (0)
 435 #define check_pgt_cache()      do { } while (0)
 436
 437 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
 438 #define HAVE_PAGE_AGP 1
 439
 440 /* fs/proc/kcore.c */
 441 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
 442 #define kc_offset_to_vaddr(o) \
 443    (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
 444
 445 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 446 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
 447 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 448 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 449 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 450 #define __HAVE_ARCH_PTE_SAME
 451 #include <asm-generic/pgtable.h>
 452
 453 #endif /* _X86_64_PGTABLE_H */