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