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  1. #ifndef _ASM_X86_PGTABLE_DEFS_H
  2. #define _ASM_X86_PGTABLE_DEFS_H
  3.  
  4. #include <linux/const.h>
  5. #include <asm/page_types.h>
  6.  
  7. #define FIRST_USER_ADDRESS      0UL
  8.  
  9. #define _PAGE_BIT_PRESENT       0       /* is present */
  10. #define _PAGE_BIT_RW            1       /* writeable */
  11. #define _PAGE_BIT_USER          2       /* userspace addressable */
  12. #define _PAGE_BIT_PWT           3       /* page write through */
  13. #define _PAGE_BIT_PCD           4       /* page cache disabled */
  14. #define _PAGE_BIT_ACCESSED      5       /* was accessed (raised by CPU) */
  15. #define _PAGE_BIT_DIRTY         6       /* was written to (raised by CPU) */
  16. #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  17. #define _PAGE_BIT_PAT           7       /* on 4KB pages */
  18. #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  19. #define _PAGE_BIT_SOFTW1        9       /* available for programmer */
  20. #define _PAGE_BIT_SOFTW2        10      /* " */
  21. #define _PAGE_BIT_SOFTW3        11      /* " */
  22. #define _PAGE_BIT_PAT_LARGE     12      /* On 2MB or 1GB pages */
  23. #define _PAGE_BIT_SOFTW4        58      /* available for programmer */
  24. #define _PAGE_BIT_PKEY_BIT0     59      /* Protection Keys, bit 1/4 */
  25. #define _PAGE_BIT_PKEY_BIT1     60      /* Protection Keys, bit 2/4 */
  26. #define _PAGE_BIT_PKEY_BIT2     61      /* Protection Keys, bit 3/4 */
  27. #define _PAGE_BIT_PKEY_BIT3     62      /* Protection Keys, bit 4/4 */
  28. #define _PAGE_BIT_NX            63      /* No execute: only valid after cpuid check */
  29.  
  30. #define _PAGE_BIT_SPECIAL       _PAGE_BIT_SOFTW1
  31. #define _PAGE_BIT_CPA_TEST      _PAGE_BIT_SOFTW1
  32. #define _PAGE_BIT_HIDDEN        _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
  33. #define _PAGE_BIT_SOFT_DIRTY    _PAGE_BIT_SOFTW3 /* software dirty tracking */
  34. #define _PAGE_BIT_DEVMAP        _PAGE_BIT_SOFTW4
  35.  
  36. /* If _PAGE_BIT_PRESENT is clear, we use these: */
  37. /* - if the user mapped it with PROT_NONE; pte_present gives true */
  38. #define _PAGE_BIT_PROTNONE      _PAGE_BIT_GLOBAL
  39.  
  40. #define _PAGE_PRESENT   (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
  41. #define _PAGE_RW        (_AT(pteval_t, 1) << _PAGE_BIT_RW)
  42. #define _PAGE_USER      (_AT(pteval_t, 1) << _PAGE_BIT_USER)
  43. #define _PAGE_PWT       (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
  44. #define _PAGE_PCD       (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
  45. #define _PAGE_ACCESSED  (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
  46. #define _PAGE_DIRTY     (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
  47. #define _PAGE_PSE       (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
  48. #define _PAGE_GLOBAL    (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
  49. #define _PAGE_SOFTW1    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
  50. #define _PAGE_SOFTW2    (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW2)
  51. #define _PAGE_PAT       (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
  52. #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
  53. #define _PAGE_SPECIAL   (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
  54. #define _PAGE_CPA_TEST  (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
  55. #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
  56. #define _PAGE_PKEY_BIT0 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT0)
  57. #define _PAGE_PKEY_BIT1 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT1)
  58. #define _PAGE_PKEY_BIT2 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT2)
  59. #define _PAGE_PKEY_BIT3 (_AT(pteval_t, 1) << _PAGE_BIT_PKEY_BIT3)
  60. #else
  61. #define _PAGE_PKEY_BIT0 (_AT(pteval_t, 0))
  62. #define _PAGE_PKEY_BIT1 (_AT(pteval_t, 0))
  63. #define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
  64. #define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
  65. #endif
  66. #define __HAVE_ARCH_PTE_SPECIAL
  67.  
  68. #define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
  69.                          _PAGE_PKEY_BIT1 | \
  70.                          _PAGE_PKEY_BIT2 | \
  71.                          _PAGE_PKEY_BIT3)
  72.  
  73. #ifdef CONFIG_KMEMCHECK
  74. #define _PAGE_HIDDEN    (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
  75. #else
  76. #define _PAGE_HIDDEN    (_AT(pteval_t, 0))
  77. #endif
  78.  
  79. /*
  80.  * The same hidden bit is used by kmemcheck, but since kmemcheck
  81.  * works on kernel pages while soft-dirty engine on user space,
  82.  * they do not conflict with each other.
  83.  */
  84.  
  85. #ifdef CONFIG_MEM_SOFT_DIRTY
  86. #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
  87. #else
  88. #define _PAGE_SOFT_DIRTY        (_AT(pteval_t, 0))
  89. #endif
  90.  
  91. /*
  92.  * Tracking soft dirty bit when a page goes to a swap is tricky.
  93.  * We need a bit which can be stored in pte _and_ not conflict
  94.  * with swap entry format. On x86 bits 6 and 7 are *not* involved
  95.  * into swap entry computation, but bit 6 is used for nonlinear
  96.  * file mapping, so we borrow bit 7 for soft dirty tracking.
  97.  *
  98.  * Please note that this bit must be treated as swap dirty page
  99.  * mark if and only if the PTE has present bit clear!
  100.  */
  101. #ifdef CONFIG_MEM_SOFT_DIRTY
  102. #define _PAGE_SWP_SOFT_DIRTY    _PAGE_PSE
  103. #else
  104. #define _PAGE_SWP_SOFT_DIRTY    (_AT(pteval_t, 0))
  105. #endif
  106.  
  107. #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  108. #define _PAGE_NX        (_AT(pteval_t, 1) << _PAGE_BIT_NX)
  109. #define _PAGE_DEVMAP    (_AT(u64, 1) << _PAGE_BIT_DEVMAP)
  110. #define __HAVE_ARCH_PTE_DEVMAP
  111. #else
  112. #define _PAGE_NX        (_AT(pteval_t, 0))
  113. #define _PAGE_DEVMAP    (_AT(pteval_t, 0))
  114. #endif
  115.  
  116. #define _PAGE_PROTNONE  (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
  117.  
  118. #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |        \
  119.                          _PAGE_ACCESSED | _PAGE_DIRTY)
  120. #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |    \
  121.                          _PAGE_DIRTY)
  122.  
  123. /*
  124.  * Set of bits not changed in pte_modify.  The pte's
  125.  * protection key is treated like _PAGE_RW, for
  126.  * instance, and is *not* included in this mask since
  127.  * pte_modify() does modify it.
  128.  */
  129. #define _PAGE_CHG_MASK  (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT |         \
  130.                          _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
  131.                          _PAGE_SOFT_DIRTY)
  132. #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
  133.  
  134. /*
  135.  * The cache modes defined here are used to translate between pure SW usage
  136.  * and the HW defined cache mode bits and/or PAT entries.
  137.  *
  138.  * The resulting bits for PWT, PCD and PAT should be chosen in a way
  139.  * to have the WB mode at index 0 (all bits clear). This is the default
  140.  * right now and likely would break too much if changed.
  141.  */
  142. #ifndef __ASSEMBLY__
  143. enum page_cache_mode {
  144.         _PAGE_CACHE_MODE_WB = 0,
  145.         _PAGE_CACHE_MODE_WC = 1,
  146.         _PAGE_CACHE_MODE_UC_MINUS = 2,
  147.         _PAGE_CACHE_MODE_UC = 3,
  148.         _PAGE_CACHE_MODE_WT = 4,
  149.         _PAGE_CACHE_MODE_WP = 5,
  150.         _PAGE_CACHE_MODE_NUM = 8
  151. };
  152. #endif
  153.  
  154. #define _PAGE_CACHE_MASK        (_PAGE_PAT | _PAGE_PCD | _PAGE_PWT)
  155. #define _PAGE_NOCACHE           (cachemode2protval(_PAGE_CACHE_MODE_UC))
  156.  
  157. #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  158. #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
  159.                                  _PAGE_ACCESSED | _PAGE_NX)
  160.  
  161. #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW |     \
  162.                                          _PAGE_USER | _PAGE_ACCESSED)
  163. #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  164.                                          _PAGE_ACCESSED | _PAGE_NX)
  165. #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  166.                                          _PAGE_ACCESSED)
  167. #define PAGE_COPY               PAGE_COPY_NOEXEC
  168. #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  169.                                          _PAGE_ACCESSED | _PAGE_NX)
  170. #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER |   \
  171.                                          _PAGE_ACCESSED)
  172.  
  173. #define __PAGE_KERNEL_EXEC                                              \
  174.         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
  175. #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
  176.  
  177. #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
  178. #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
  179. #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_NOCACHE)
  180. #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
  181. #define __PAGE_KERNEL_VVAR              (__PAGE_KERNEL_RO | _PAGE_USER)
  182. #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
  183. #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
  184.  
  185. #define __PAGE_KERNEL_IO                (__PAGE_KERNEL)
  186. #define __PAGE_KERNEL_IO_NOCACHE        (__PAGE_KERNEL_NOCACHE)
  187.  
  188. #define PAGE_KERNEL                     __pgprot(__PAGE_KERNEL)
  189. #define PAGE_KERNEL_RO                  __pgprot(__PAGE_KERNEL_RO)
  190. #define PAGE_KERNEL_EXEC                __pgprot(__PAGE_KERNEL_EXEC)
  191. #define PAGE_KERNEL_RX                  __pgprot(__PAGE_KERNEL_RX)
  192. #define PAGE_KERNEL_NOCACHE             __pgprot(__PAGE_KERNEL_NOCACHE)
  193. #define PAGE_KERNEL_LARGE               __pgprot(__PAGE_KERNEL_LARGE)
  194. #define PAGE_KERNEL_LARGE_EXEC          __pgprot(__PAGE_KERNEL_LARGE_EXEC)
  195. #define PAGE_KERNEL_VSYSCALL            __pgprot(__PAGE_KERNEL_VSYSCALL)
  196. #define PAGE_KERNEL_VVAR                __pgprot(__PAGE_KERNEL_VVAR)
  197.  
  198. #define PAGE_KERNEL_IO                  __pgprot(__PAGE_KERNEL_IO)
  199. #define PAGE_KERNEL_IO_NOCACHE          __pgprot(__PAGE_KERNEL_IO_NOCACHE)
  200.  
  201. /*         xwr */
  202. #define __P000  PAGE_NONE
  203. #define __P001  PAGE_READONLY
  204. #define __P010  PAGE_COPY
  205. #define __P011  PAGE_COPY
  206. #define __P100  PAGE_READONLY_EXEC
  207. #define __P101  PAGE_READONLY_EXEC
  208. #define __P110  PAGE_COPY_EXEC
  209. #define __P111  PAGE_COPY_EXEC
  210.  
  211. #define __S000  PAGE_NONE
  212. #define __S001  PAGE_READONLY
  213. #define __S010  PAGE_SHARED
  214. #define __S011  PAGE_SHARED
  215. #define __S100  PAGE_READONLY_EXEC
  216. #define __S101  PAGE_READONLY_EXEC
  217. #define __S110  PAGE_SHARED_EXEC
  218. #define __S111  PAGE_SHARED_EXEC
  219.  
  220. /*
  221.  * early identity mapping  pte attrib macros.
  222.  */
  223. #ifdef CONFIG_X86_64
  224. #define __PAGE_KERNEL_IDENT_LARGE_EXEC  __PAGE_KERNEL_LARGE_EXEC
  225. #else
  226. #define PTE_IDENT_ATTR   0x003          /* PRESENT+RW */
  227. #define PDE_IDENT_ATTR   0x063          /* PRESENT+RW+DIRTY+ACCESSED */
  228. #define PGD_IDENT_ATTR   0x001          /* PRESENT (no other attributes) */
  229. #endif
  230.  
  231. #ifdef CONFIG_X86_32
  232. # include <asm/pgtable_32_types.h>
  233. #else
  234. # include <asm/pgtable_64_types.h>
  235. #endif
  236.  
  237. #ifndef __ASSEMBLY__
  238.  
  239. #include <linux/types.h>
  240.  
  241. /* Extracts the PFN from a (pte|pmd|pud|pgd)val_t of a 4KB page */
  242. #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
  243.  
  244. /*
  245.  *  Extracts the flags from a (pte|pmd|pud|pgd)val_t
  246.  *  This includes the protection key value.
  247.  */
  248. #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
  249.  
  250. typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
  251.  
  252. typedef struct { pgdval_t pgd; } pgd_t;
  253.  
  254. static inline pgd_t native_make_pgd(pgdval_t val)
  255. {
  256.         return (pgd_t) { val };
  257. }
  258.  
  259. static inline pgdval_t native_pgd_val(pgd_t pgd)
  260. {
  261.         return pgd.pgd;
  262. }
  263.  
  264. static inline pgdval_t pgd_flags(pgd_t pgd)
  265. {
  266.         return native_pgd_val(pgd) & PTE_FLAGS_MASK;
  267. }
  268.  
  269. #if CONFIG_PGTABLE_LEVELS > 3
  270. typedef struct { pudval_t pud; } pud_t;
  271.  
  272. static inline pud_t native_make_pud(pmdval_t val)
  273. {
  274.         return (pud_t) { val };
  275. }
  276.  
  277. static inline pudval_t native_pud_val(pud_t pud)
  278. {
  279.         return pud.pud;
  280. }
  281. #else
  282. #include <asm-generic/pgtable-nopud.h>
  283.  
  284. static inline pudval_t native_pud_val(pud_t pud)
  285. {
  286.         return native_pgd_val(pud.pgd);
  287. }
  288. #endif
  289.  
  290. #if CONFIG_PGTABLE_LEVELS > 2
  291. typedef struct { pmdval_t pmd; } pmd_t;
  292.  
  293. static inline pmd_t native_make_pmd(pmdval_t val)
  294. {
  295.         return (pmd_t) { val };
  296. }
  297.  
  298. static inline pmdval_t native_pmd_val(pmd_t pmd)
  299. {
  300.         return pmd.pmd;
  301. }
  302. #else
  303. #include <asm-generic/pgtable-nopmd.h>
  304.  
  305. static inline pmdval_t native_pmd_val(pmd_t pmd)
  306. {
  307.         return native_pgd_val(pmd.pud.pgd);
  308. }
  309. #endif
  310.  
  311. static inline pudval_t pud_pfn_mask(pud_t pud)
  312. {
  313.         if (native_pud_val(pud) & _PAGE_PSE)
  314.                 return PHYSICAL_PUD_PAGE_MASK;
  315.         else
  316.                 return PTE_PFN_MASK;
  317. }
  318.  
  319. static inline pudval_t pud_flags_mask(pud_t pud)
  320. {
  321.         return ~pud_pfn_mask(pud);
  322. }
  323.  
  324. static inline pudval_t pud_flags(pud_t pud)
  325. {
  326.         return native_pud_val(pud) & pud_flags_mask(pud);
  327. }
  328.  
  329. static inline pmdval_t pmd_pfn_mask(pmd_t pmd)
  330. {
  331.         if (native_pmd_val(pmd) & _PAGE_PSE)
  332.                 return PHYSICAL_PMD_PAGE_MASK;
  333.         else
  334.                 return PTE_PFN_MASK;
  335. }
  336.  
  337. static inline pmdval_t pmd_flags_mask(pmd_t pmd)
  338. {
  339.         return ~pmd_pfn_mask(pmd);
  340. }
  341.  
  342. static inline pmdval_t pmd_flags(pmd_t pmd)
  343. {
  344.         return native_pmd_val(pmd) & pmd_flags_mask(pmd);
  345. }
  346.  
  347. static inline pte_t native_make_pte(pteval_t val)
  348. {
  349.         return (pte_t) { .pte = val };
  350. }
  351.  
  352. static inline pteval_t native_pte_val(pte_t pte)
  353. {
  354.         return pte.pte;
  355. }
  356.  
  357. static inline pteval_t pte_flags(pte_t pte)
  358. {
  359.         return native_pte_val(pte) & PTE_FLAGS_MASK;
  360. }
  361.  
  362. #define pgprot_val(x)   ((x).pgprot)
  363. #define __pgprot(x)     ((pgprot_t) { (x) } )
  364.  
  365. extern uint16_t __cachemode2pte_tbl[_PAGE_CACHE_MODE_NUM];
  366. extern uint8_t __pte2cachemode_tbl[8];
  367.  
  368. #define __pte2cm_idx(cb)                                \
  369.         ((((cb) >> (_PAGE_BIT_PAT - 2)) & 4) |          \
  370.          (((cb) >> (_PAGE_BIT_PCD - 1)) & 2) |          \
  371.          (((cb) >> _PAGE_BIT_PWT) & 1))
  372. #define __cm_idx2pte(i)                                 \
  373.         ((((i) & 4) << (_PAGE_BIT_PAT - 2)) |           \
  374.          (((i) & 2) << (_PAGE_BIT_PCD - 1)) |           \
  375.          (((i) & 1) << _PAGE_BIT_PWT))
  376.  
  377. static inline unsigned long cachemode2protval(enum page_cache_mode pcm)
  378. {
  379.         if (likely(pcm == 0))
  380.                 return 0;
  381.         return __cachemode2pte_tbl[pcm];
  382. }
  383. static inline pgprot_t cachemode2pgprot(enum page_cache_mode pcm)
  384. {
  385.         return __pgprot(cachemode2protval(pcm));
  386. }
  387. static inline enum page_cache_mode pgprot2cachemode(pgprot_t pgprot)
  388. {
  389.         unsigned long masked;
  390.  
  391.         masked = pgprot_val(pgprot) & _PAGE_CACHE_MASK;
  392.         if (likely(masked == 0))
  393.                 return 0;
  394.         return __pte2cachemode_tbl[__pte2cm_idx(masked)];
  395. }
  396. static inline pgprot_t pgprot_4k_2_large(pgprot_t pgprot)
  397. {
  398.         pgprotval_t val = pgprot_val(pgprot);
  399.         pgprot_t new;
  400.  
  401.         pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
  402.                 ((val & _PAGE_PAT) << (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
  403.         return new;
  404. }
  405. static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
  406. {
  407.         pgprotval_t val = pgprot_val(pgprot);
  408.         pgprot_t new;
  409.  
  410.         pgprot_val(new) = (val & ~(_PAGE_PAT | _PAGE_PAT_LARGE)) |
  411.                           ((val & _PAGE_PAT_LARGE) >>
  412.                            (_PAGE_BIT_PAT_LARGE - _PAGE_BIT_PAT));
  413.         return new;
  414. }
  415.  
  416.  
  417. typedef struct page *pgtable_t;
  418.  
  419. extern pteval_t __supported_pte_mask;
  420. extern void set_nx(void);
  421. extern int nx_enabled;
  422.  
  423. #define pgprot_writecombine     pgprot_writecombine
  424. extern pgprot_t pgprot_writecombine(pgprot_t prot);
  425.  
  426. #define pgprot_writethrough     pgprot_writethrough
  427. extern pgprot_t pgprot_writethrough(pgprot_t prot);
  428.  
  429. /* Indicate that x86 has its own track and untrack pfn vma functions */
  430. #define __HAVE_PFNMAP_TRACKING
  431.  
  432. #define __HAVE_PHYS_MEM_ACCESS_PROT
  433. struct file;
  434. pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
  435.                               unsigned long size, pgprot_t vma_prot);
  436. int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
  437.                               unsigned long size, pgprot_t *vma_prot);
  438.  
  439. /* Install a pte for a particular vaddr in kernel space. */
  440. void set_pte_vaddr(unsigned long vaddr, pte_t pte);
  441.  
  442. #ifdef CONFIG_X86_32
  443. extern void native_pagetable_init(void);
  444. #else
  445. #define native_pagetable_init        paging_init
  446. #endif
  447.  
  448. struct seq_file;
  449. extern void arch_report_meminfo(struct seq_file *m);
  450.  
  451. enum pg_level {
  452.         PG_LEVEL_NONE,
  453.         PG_LEVEL_4K,
  454.         PG_LEVEL_2M,
  455.         PG_LEVEL_1G,
  456.         PG_LEVEL_NUM
  457. };
  458.  
  459. #ifdef CONFIG_PROC_FS
  460. extern void update_page_count(int level, unsigned long pages);
  461. #else
  462. static inline void update_page_count(int level, unsigned long pages) { }
  463. #endif
  464.  
  465. /*
  466.  * Helper function that returns the kernel pagetable entry controlling
  467.  * the virtual address 'address'. NULL means no pagetable entry present.
  468.  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
  469.  * as a pte too.
  470.  */
  471. extern pte_t *lookup_address(unsigned long address, unsigned int *level);
  472. extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
  473.                                     unsigned int *level);
  474. extern pmd_t *lookup_pmd_address(unsigned long address);
  475. extern phys_addr_t slow_virt_to_phys(void *__address);
  476. extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
  477.                                    unsigned numpages, unsigned long page_flags);
  478. void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
  479.                                unsigned numpages);
  480. #endif  /* !__ASSEMBLY__ */
  481.  
  482. #endif /* _ASM_X86_PGTABLE_DEFS_H */
  483.