arch/x86/include/asm/pgtable.h

   1 #ifndef _ASM_X86_PGTABLE_H
   2 #define _ASM_X86_PGTABLE_H
   3
   4 #define FIRST_USER_ADDRESS      0
   5
   6 #define _PAGE_BIT_PRESENT       0       /* is present */
   7 #define _PAGE_BIT_RW            1       /* writeable */
   8 #define _PAGE_BIT_USER          2       /* userspace addressable */
   9 #define _PAGE_BIT_PWT           3       /* page write through */
  10 #define _PAGE_BIT_PCD           4       /* page cache disabled */
  11 #define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
  12 #define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
  13 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  14 #define _PAGE_BIT_PAT           7       /* on 4KB pages */
  15 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  16 #define _PAGE_BIT_UNUSED1       9       /* available for programmer */
  17 #define _PAGE_BIT_IOMAP         10      /* flag used to indicate IO mapping */
  18 #define _PAGE_BIT_UNUSED3       11
  19 #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  20 #define _PAGE_BIT_SPECIAL       _PAGE_BIT_UNUSED1
  21 #define _PAGE_BIT_CPA_TEST      _PAGE_BIT_UNUSED1
  22 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
  23
  24 /* If _PAGE_BIT_PRESENT is clear, we use these: */
  25 /* - if the user mapped it with PROT_NONE; pte_present gives true */
  26 #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  27 /* - set: nonlinear file mapping, saved PTE; unset:swap */
  28 #define _PAGE_BIT_FILE          _PAGE_BIT_DIRTY
  29
  30 #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  31 #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  32 #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  33 #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  34 #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  35 #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  36 #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  37 #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  38 #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  39 #define _PAGE_UNUSED1   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
  40 #define _PAGE_IOMAP     (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
  41 #define _PAGE_UNUSED3   (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
  42 #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  43 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  44 #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  45 #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  46 #define __HAVE_ARCH_PTE_SPECIAL
  47
  48 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  49 #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
  50 #else
  51 #define _PAGE_NX        (_AT(pteval_t, 0))
  52 #endif
  53
  54 #define _PAGE_FILE      (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
  55 #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  56
  57 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  58                          _PAGE_ACCESSED | _PAGE_DIRTY)
  59 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  60                          _PAGE_DIRTY)
  61
  62 /* Set of bits not changed in pte_modify */
  63 #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
  64                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
  65
  66 #define _PAGE_CACHE_MASK        (_PAGE_PCD | _PAGE_PWT)
  67 #define _PAGE_CACHE_WB          (0)
  68 #define _PAGE_CACHE_WC          (_PAGE_PWT)
  69 #define _PAGE_CACHE_UC_MINUS    (_PAGE_PCD)
  70 #define _PAGE_CACHE_UC          (_PAGE_PCD | _PAGE_PWT)
  71
  72 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  73 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  74                                  _PAGE_ACCESSED | _PAGE_NX)
  75
  76 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
  77                                          _PAGE_USER | _PAGE_ACCESSED)
  78 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  79                                          _PAGE_ACCESSED | _PAGE_NX)
  80 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  81                                          _PAGE_ACCESSED)
  82 #define PAGE_COPY               PAGE_COPY_NOEXEC
  83 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  84                                          _PAGE_ACCESSED | _PAGE_NX)
  85 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  86                                          _PAGE_ACCESSED)
  87
  88 #define __PAGE_KERNEL_EXEC                                              \
  89         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
  90 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
  91
  92 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
  93 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
  94 #define __PAGE_KERNEL_EXEC_NOCACHE      (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
  95 #define __PAGE_KERNEL_WC                (__PAGE_KERNEL | _PAGE_CACHE_WC)
  96 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
  97 #define __PAGE_KERNEL_UC_MINUS          (__PAGE_KERNEL | _PAGE_PCD)
  98 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
  99 #define __PAGE_KERNEL_VSYSCALL_NOCACHE  (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
 100 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
 101 #define __PAGE_KERNEL_LARGE_NOCACHE     (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
 102 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
 103
 104 #define __PAGE_KERNEL_IO                (__PAGE_KERNEL | _PAGE_IOMAP)
 105 #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
 106 #define __PAGE_KERNEL_IO_UC_MINUS       (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
 107 #define __PAGE_KERNEL_IO_WC             (__PAGE_KERNEL_WC | _PAGE_IOMAP)
 108
 109 #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
 110 #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
 111 #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
 112 #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
 113 #define PAGE_KERNEL_WC                  __pgprot(__PAGE_KERNEL_WC)
 114 #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
 115 #define PAGE_KERNEL_UC_MINUS            __pgprot(__PAGE_KERNEL_UC_MINUS)
 116 #define PAGE_KERNEL_EXEC_NOCACHE        __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
 117 #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
 118 #define PAGE_KERNEL_LARGE_NOCACHE       __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
 119 #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
 120 #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
 121 #define PAGE_KERNEL_VSYSCALL_NOCACHE    __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
 122
 123 #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
 124 #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
 125 #define PAGE_KERNEL_IO_UC_MINUS         __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
 126 #define PAGE_KERNEL_IO_WC               __pgprot(__PAGE_KERNEL_IO_WC)
 127
 128 /*         xwr */
 129 #define __P000  PAGE_NONE
 130 #define __P001  PAGE_READONLY
 131 #define __P010  PAGE_COPY
 132 #define __P011  PAGE_COPY
 133 #define __P100  PAGE_READONLY_EXEC
 134 #define __P101  PAGE_READONLY_EXEC
 135 #define __P110  PAGE_COPY_EXEC
 136 #define __P111  PAGE_COPY_EXEC
 137
 138 #define __S000  PAGE_NONE
 139 #define __S001  PAGE_READONLY
 140 #define __S010  PAGE_SHARED
 141 #define __S011  PAGE_SHARED
 142 #define __S100  PAGE_READONLY_EXEC
 143 #define __S101  PAGE_READONLY_EXEC
 144 #define __S110  PAGE_SHARED_EXEC
 145 #define __S111  PAGE_SHARED_EXEC
 146
 147 /*
 148  * early identity mapping  pte attrib macros.
 149  */
 150 #ifdef CONFIG_X86_64
 151 #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
 152 #else
 153 /*
 154  * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
 155  * bits are combined, this will alow user to access the high address mapped
 156  * VDSO in the presence of CONFIG_COMPAT_VDSO
 157  */
 158 #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
 159 #define PDE_IDENT_ATTR   0x067          /* PRESENT+RW+USER+DIRTY+ACCESSED */
 160 #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
 161 #endif
 162
 163 /*
 164  * Macro to mark a page protection value as UC-
 165  */
 166 #define pgprot_noncached(prot)                                  \
 167         ((boot_cpu_data.x86 > 3)                                \
 168          ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS))  \
 169          : (prot))
 170
 171 #ifndef __ASSEMBLY__
 172
 173 #define pgprot_writecombine     pgprot_writecombine
 174 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 175
 176 /*
 177  * ZERO_PAGE is a global shared page that is always zero: used
 178  * for zero-mapped memory areas etc..
 179  */
 180 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 181 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
 182
 183 extern spinlock_t pgd_lock;
 184 extern struct list_head pgd_list;
 185
 186 /*
 187  * The following only work if pte_present() is true.
 188  * Undefined behaviour if not..
 189  */
 190 static inline int pte_dirty(pte_t pte)
 191 {
 192         return pte_flags(pte) & _PAGE_DIRTY;
 193 }
 194
 195 static inline int pte_young(pte_t pte)
 196 {
 197         return pte_flags(pte) & _PAGE_ACCESSED;
 198 }
 199
 200 static inline int pte_write(pte_t pte)
 201 {
 202         return pte_flags(pte) & _PAGE_RW;
 203 }
 204
 205 static inline int pte_file(pte_t pte)
 206 {
 207         return pte_flags(pte) & _PAGE_FILE;
 208 }
 209
 210 static inline int pte_huge(pte_t pte)
 211 {
 212         return pte_flags(pte) & _PAGE_PSE;
 213 }
 214
 215 static inline int pte_global(pte_t pte)
 216 {
 217         return pte_flags(pte) & _PAGE_GLOBAL;
 218 }
 219
 220 static inline int pte_exec(pte_t pte)
 221 {
 222         return !(pte_flags(pte) & _PAGE_NX);
 223 }
 224
 225 static inline int pte_special(pte_t pte)
 226 {
 227         return pte_flags(pte) & _PAGE_SPECIAL;
 228 }
 229
 230 static inline unsigned long pte_pfn(pte_t pte)
 231 {
 232         return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
 233 }
 234
 235 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 236
 237 static inline int pmd_large(pmd_t pte)
 238 {
 239         return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 240                 (_PAGE_PSE | _PAGE_PRESENT);
 241 }
 242
 243 static inline pte_t pte_mkclean(pte_t pte)
 244 {
 245         return __pte(pte_val(pte) & ~_PAGE_DIRTY);
 246 }
 247
 248 static inline pte_t pte_mkold(pte_t pte)
 249 {
 250         return __pte(pte_val(pte) & ~_PAGE_ACCESSED);
 251 }
 252
 253 static inline pte_t pte_wrprotect(pte_t pte)
 254 {
 255         return __pte(pte_val(pte) & ~_PAGE_RW);
 256 }
 257
 258 static inline pte_t pte_mkexec(pte_t pte)
 259 {
 260         return __pte(pte_val(pte) & ~_PAGE_NX);
 261 }
 262
 263 static inline pte_t pte_mkdirty(pte_t pte)
 264 {
 265         return __pte(pte_val(pte) | _PAGE_DIRTY);
 266 }
 267
 268 static inline pte_t pte_mkyoung(pte_t pte)
 269 {
 270         return __pte(pte_val(pte) | _PAGE_ACCESSED);
 271 }
 272
 273 static inline pte_t pte_mkwrite(pte_t pte)
 274 {
 275         return __pte(pte_val(pte) | _PAGE_RW);
 276 }
 277
 278 static inline pte_t pte_mkhuge(pte_t pte)
 279 {
 280         return __pte(pte_val(pte) | _PAGE_PSE);
 281 }
 282
 283 static inline pte_t pte_clrhuge(pte_t pte)
 284 {
 285         return __pte(pte_val(pte) & ~_PAGE_PSE);
 286 }
 287
 288 static inline pte_t pte_mkglobal(pte_t pte)
 289 {
 290         return __pte(pte_val(pte) | _PAGE_GLOBAL);
 291 }
 292
 293 static inline pte_t pte_clrglobal(pte_t pte)
 294 {
 295         return __pte(pte_val(pte) & ~_PAGE_GLOBAL);
 296 }
 297
 298 static inline pte_t pte_mkspecial(pte_t pte)
 299 {
 300         return __pte(pte_val(pte) | _PAGE_SPECIAL);
 301 }
 302
 303 extern pteval_t __supported_pte_mask;
 304
 305 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 306 {
 307         return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
 308                       pgprot_val(pgprot)) & __supported_pte_mask);
 309 }
 310
 311 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 312 {
 313         return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
 314                       pgprot_val(pgprot)) & __supported_pte_mask);
 315 }
 316
 317 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 318 {
 319         pteval_t val = pte_val(pte);
 320
 321         /*
 322          * Chop off the NX bit (if present), and add the NX portion of
 323          * the newprot (if present):
 324          */
 325         val &= _PAGE_CHG_MASK;
 326         val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
 327
 328         return __pte(val);
 329 }
 330
 331 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
 332 #define pgprot_modify pgprot_modify
 333 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 334 {
 335         pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
 336         pgprotval_t addbits = pgprot_val(newprot);
 337         return __pgprot(preservebits | addbits);
 338 }
 339
 340 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
 341
 342 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
 343
 344 static inline int is_new_memtype_allowed(unsigned long flags,
 345                                                 unsigned long new_flags)
 346 {
 347         /*
 348          * Certain new memtypes are not allowed with certain
 349          * requested memtype:
 350          * - request is uncached, return cannot be write-back
 351          * - request is write-combine, return cannot be write-back
 352          */
 353         if ((flags == _PAGE_CACHE_UC_MINUS &&
 354              new_flags == _PAGE_CACHE_WB) ||
 355             (flags == _PAGE_CACHE_WC &&
 356              new_flags == _PAGE_CACHE_WB)) {
 357                 return 0;
 358         }
 359
 360         return 1;
 361 }
 362
 363 #ifndef __ASSEMBLY__
 364 /* Indicate that x86 has its own track and untrack pfn vma functions */
 365 #define __HAVE_PFNMAP_TRACKING
 366
 367 #define __HAVE_PHYS_MEM_ACCESS_PROT
 368 struct file;
 369 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 370                               unsigned long size, pgprot_t vma_prot);
 371 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 372                               unsigned long size, pgprot_t *vma_prot);
 373 #endif
 374
 375 /* Install a pte for a particular vaddr in kernel space. */
 376 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 377
 378 #ifdef CONFIG_X86_32
 379 extern void native_pagetable_setup_start(pgd_t *base);
 380 extern void native_pagetable_setup_done(pgd_t *base);
 381 #else
 382 static inline void native_pagetable_setup_start(pgd_t *base) {}
 383 static inline void native_pagetable_setup_done(pgd_t *base) {}
 384 #endif
 385
 386 struct seq_file;
 387 extern void arch_report_meminfo(struct seq_file *m);
 388
 389 #ifdef CONFIG_PARAVIRT
 390 #include <asm/paravirt.h>
 391 #else  /* !CONFIG_PARAVIRT */
 392 #define set_pte(ptep, pte)              native_set_pte(ptep, pte)
 393 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
 394
 395 #define set_pte_present(mm, addr, ptep, pte)                            \
 396         native_set_pte_present(mm, addr, ptep, pte)
 397 #define set_pte_atomic(ptep, pte)                                       \
 398         native_set_pte_atomic(ptep, pte)
 399
 400 #define set_pmd(pmdp, pmd)              native_set_pmd(pmdp, pmd)
 401
 402 #ifndef __PAGETABLE_PUD_FOLDED
 403 #define set_pgd(pgdp, pgd)              native_set_pgd(pgdp, pgd)
 404 #define pgd_clear(pgd)                  native_pgd_clear(pgd)
 405 #endif
 406
 407 #ifndef set_pud
 408 # define set_pud(pudp, pud)             native_set_pud(pudp, pud)
 409 #endif
 410
 411 #ifndef __PAGETABLE_PMD_FOLDED
 412 #define pud_clear(pud)                  native_pud_clear(pud)
 413 #endif
 414
 415 #define pte_clear(mm, addr, ptep)       native_pte_clear(mm, addr, ptep)
 416 #define pmd_clear(pmd)                  native_pmd_clear(pmd)
 417
 418 #define pte_update(mm, addr, ptep)              do { } while (0)
 419 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 420
 421 static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
 422 {
 423         native_pagetable_setup_start(base);
 424 }
 425
 426 static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
 427 {
 428         native_pagetable_setup_done(base);
 429 }
 430 #endif  /* CONFIG_PARAVIRT */
 431
 432 #endif  /* __ASSEMBLY__ */
 433
 434 #ifdef CONFIG_X86_32
 435 # include "pgtable_32.h"
 436 #else
 437 # include "pgtable_64.h"
 438 #endif
 439
 440 /*
 441  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 442  *
 443  * this macro returns the index of the entry in the pgd page which would
 444  * control the given virtual address
 445  */
 446 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 447
 448 /*
 449  * pgd_offset() returns a (pgd_t *)
 450  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 451  */
 452 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
 453 /*
 454  * a shortcut which implies the use of the kernel's pgd, instead
 455  * of a process's
 456  */
 457 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
 458
 459
 460 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 461 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 462
 463 #ifndef __ASSEMBLY__
 464
 465 enum {
 466         PG_LEVEL_NONE,
 467         PG_LEVEL_4K,
 468         PG_LEVEL_2M,
 469         PG_LEVEL_1G,
 470         PG_LEVEL_NUM
 471 };
 472
 473 #ifdef CONFIG_PROC_FS
 474 extern void update_page_count(int level, unsigned long pages);
 475 #else
 476 static inline void update_page_count(int level, unsigned long pages) { }
 477 #endif
 478
 479 /*
 480  * Helper function that returns the kernel pagetable entry controlling
 481  * the virtual address 'address'. NULL means no pagetable entry present.
 482  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
 483  * as a pte too.
 484  */
 485 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 486
 487 /* local pte updates need not use xchg for locking */
 488 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 489 {
 490         pte_t res = *ptep;
 491
 492         /* Pure native function needs no input for mm, addr */
 493         native_pte_clear(NULL, 0, ptep);
 494         return res;
 495 }
 496
 497 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 498                                      pte_t *ptep , pte_t pte)
 499 {
 500         native_set_pte(ptep, pte);
 501 }
 502
 503 #ifndef CONFIG_PARAVIRT
 504 /*
 505  * Rules for using pte_update - it must be called after any PTE update which
 506  * has not been done using the set_pte / clear_pte interfaces.  It is used by
 507  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 508  * updates should either be sets, clears, or set_pte_atomic for P->P
 509  * transitions, which means this hook should only be called for user PTEs.
 510  * This hook implies a P->P protection or access change has taken place, which
 511  * requires a subsequent TLB flush.  The notification can optionally be delayed
 512  * until the TLB flush event by using the pte_update_defer form of the
 513  * interface, but care must be taken to assure that the flush happens while
 514  * still holding the same page table lock so that the shadow and primary pages
 515  * do not become out of sync on SMP.
 516  */
 517 #define pte_update(mm, addr, ptep)              do { } while (0)
 518 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 519 #endif
 520
 521 /*
 522  * We only update the dirty/accessed state if we set
 523  * the dirty bit by hand in the kernel, since the hardware
 524  * will do the accessed bit for us, and we don't want to
 525  * race with other CPU's that might be updating the dirty
 526  * bit at the same time.
 527  */
 528 struct vm_area_struct;
 529
 530 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 531 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 532                                  unsigned long address, pte_t *ptep,
 533                                  pte_t entry, int dirty);
 534
 535 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 536 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
 537                                      unsigned long addr, pte_t *ptep);
 538
 539 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 540 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
 541                                   unsigned long address, pte_t *ptep);
 542
 543 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 544 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 545                                        pte_t *ptep)
 546 {
 547         pte_t pte = native_ptep_get_and_clear(ptep);
 548         pte_update(mm, addr, ptep);
 549         return pte;
 550 }
 551
 552 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 553 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 554                                             unsigned long addr, pte_t *ptep,
 555                                             int full)
 556 {
 557         pte_t pte;
 558         if (full) {
 559                 /*
 560                  * Full address destruction in progress; paravirt does not
 561                  * care about updates and native needs no locking
 562                  */
 563                 pte = native_local_ptep_get_and_clear(ptep);
 564         } else {
 565                 pte = ptep_get_and_clear(mm, addr, ptep);
 566         }
 567         return pte;
 568 }
 569
 570 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 571 static inline void ptep_set_wrprotect(struct mm_struct *mm,
 572                                       unsigned long addr, pte_t *ptep)
 573 {
 574         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
 575         pte_update(mm, addr, ptep);
 576 }
 577
 578 /*
 579  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 580  *
 581  *  dst - pointer to pgd range anwhere on a pgd page
 582  *  src - ""
 583  *  count - the number of pgds to copy.
 584  *
 585  * dst and src can be on the same page, but the range must not overlap,
 586  * and must not cross a page boundary.
 587  */
 588 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 589 {
 590        memcpy(dst, src, count * sizeof(pgd_t));
 591 }
 592
 593
 594 #include <asm-generic/pgtable.h>
 595 #endif  /* __ASSEMBLY__ */
 596
 597 #endif /* _ASM_X86_PGTABLE_H */