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