include/asm-x86/pgtable.h

   1 #ifndef _ASM_X86_PGTABLE_H
   2 #define _ASM_X86_PGTABLE_H
   3
   4 #define USER_PTRS_PER_PGD       ((TASK_SIZE-1)/PGDIR_SIZE+1)
   5 #define FIRST_USER_ADDRESS      0
   6
   7 #define _PAGE_BIT_PRESENT       0
   8 #define _PAGE_BIT_RW            1
   9 #define _PAGE_BIT_USER          2
  10 #define _PAGE_BIT_PWT           3
  11 #define _PAGE_BIT_PCD           4
  12 #define _PAGE_BIT_ACCESSED      5
  13 #define _PAGE_BIT_DIRTY         6
  14 #define _PAGE_BIT_FILE          6
  15 #define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
  16 #define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
  17 #define _PAGE_BIT_UNUSED1       9       /* available for programmer */
  18 #define _PAGE_BIT_UNUSED2       10
  19 #define _PAGE_BIT_UNUSED3       11
  20 #define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
  21
  22 #define _PAGE_PRESENT   (_AC(1, L)<<_PAGE_BIT_PRESENT)
  23 #define _PAGE_RW        (_AC(1, L)<<_PAGE_BIT_RW)
  24 #define _PAGE_USER      (_AC(1, L)<<_PAGE_BIT_USER)
  25 #define _PAGE_PWT       (_AC(1, L)<<_PAGE_BIT_PWT)
  26 #define _PAGE_PCD       (_AC(1, L)<<_PAGE_BIT_PCD)
  27 #define _PAGE_ACCESSED  (_AC(1, L)<<_PAGE_BIT_ACCESSED)
  28 #define _PAGE_DIRTY     (_AC(1, L)<<_PAGE_BIT_DIRTY)
  29 #define _PAGE_PSE       (_AC(1, L)<<_PAGE_BIT_PSE)      /* 2MB page */
  30 #define _PAGE_GLOBAL    (_AC(1, L)<<_PAGE_BIT_GLOBAL)   /* Global TLB entry */
  31 #define _PAGE_UNUSED1   (_AC(1, L)<<_PAGE_BIT_UNUSED1)
  32 #define _PAGE_UNUSED2   (_AC(1, L)<<_PAGE_BIT_UNUSED2)
  33 #define _PAGE_UNUSED3   (_AC(1, L)<<_PAGE_BIT_UNUSED3)
  34
  35 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  36 #define _PAGE_NX        (_AC(1, ULL) << _PAGE_BIT_NX)
  37 #else
  38 #define _PAGE_NX        0
  39 #endif
  40
  41 /* If _PAGE_PRESENT is clear, we use these: */
  42 #define _PAGE_FILE      _PAGE_DIRTY     /* nonlinear file mapping, saved PTE; unset:swap */
  43 #define _PAGE_PROTNONE  _PAGE_PSE       /* if the user mapped it with PROT_NONE;
  44                                            pte_present gives true */
  45
  46 #define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
  47 #define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
  48
  49 #define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
  50
  51 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
  52 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
  53
  54 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
  55 #define PAGE_COPY_NOEXEC        __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
  56 #define PAGE_COPY_EXEC          __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
  57 #define PAGE_COPY               PAGE_COPY_NOEXEC
  58 #define PAGE_READONLY           __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
  59 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
  60
  61 #ifdef CONFIG_X86_32
  62 #define _PAGE_KERNEL_EXEC \
  63         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
  64 #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
  65
  66 #ifndef __ASSEMBLY__
  67 extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC;
  68 #endif  /* __ASSEMBLY__ */
  69 #else
  70 #define __PAGE_KERNEL_EXEC                                              \
  71         (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
  72 #define __PAGE_KERNEL           (__PAGE_KERNEL_EXEC | _PAGE_NX)
  73 #endif
  74
  75 #define __PAGE_KERNEL_RO                (__PAGE_KERNEL & ~_PAGE_RW)
  76 #define __PAGE_KERNEL_RX                (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
  77 #define __PAGE_KERNEL_NOCACHE           (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
  78 #define __PAGE_KERNEL_VSYSCALL          (__PAGE_KERNEL_RX | _PAGE_USER)
  79 #define __PAGE_KERNEL_VSYSCALL_NOCACHE  (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
  80 #define __PAGE_KERNEL_LARGE             (__PAGE_KERNEL | _PAGE_PSE)
  81 #define __PAGE_KERNEL_LARGE_EXEC        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
  82
  83 #ifdef CONFIG_X86_32
  84 # define MAKE_GLOBAL(x)                 __pgprot((x))
  85 #else
  86 # define MAKE_GLOBAL(x)                 __pgprot((x) | _PAGE_GLOBAL)
  87 #endif
  88
  89 #define PAGE_KERNEL                     MAKE_GLOBAL(__PAGE_KERNEL)
  90 #define PAGE_KERNEL_RO                  MAKE_GLOBAL(__PAGE_KERNEL_RO)
  91 #define PAGE_KERNEL_EXEC                MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
  92 #define PAGE_KERNEL_RX                  MAKE_GLOBAL(__PAGE_KERNEL_RX)
  93 #define PAGE_KERNEL_NOCACHE             MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
  94 #define PAGE_KERNEL_LARGE               MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
  95 #define PAGE_KERNEL_LARGE_EXEC          MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
  96 #define PAGE_KERNEL_VSYSCALL            MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
  97 #define PAGE_KERNEL_VSYSCALL_NOCACHE    MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
  98
  99 /*         xwr */
 100 #define __P000  PAGE_NONE
 101 #define __P001  PAGE_READONLY
 102 #define __P010  PAGE_COPY
 103 #define __P011  PAGE_COPY
 104 #define __P100  PAGE_READONLY_EXEC
 105 #define __P101  PAGE_READONLY_EXEC
 106 #define __P110  PAGE_COPY_EXEC
 107 #define __P111  PAGE_COPY_EXEC
 108
 109 #define __S000  PAGE_NONE
 110 #define __S001  PAGE_READONLY
 111 #define __S010  PAGE_SHARED
 112 #define __S011  PAGE_SHARED
 113 #define __S100  PAGE_READONLY_EXEC
 114 #define __S101  PAGE_READONLY_EXEC
 115 #define __S110  PAGE_SHARED_EXEC
 116 #define __S111  PAGE_SHARED_EXEC
 117
 118 #ifndef __ASSEMBLY__
 119 /*
 120  * The following only work if pte_present() is true.
 121  * Undefined behaviour if not..
 122  */
 123 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
 124 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
 125 static inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_RW; }
 126 static inline int pte_file(pte_t pte)           { return pte_val(pte) & _PAGE_FILE; }
 127 static inline int pte_huge(pte_t pte)           { return pte_val(pte) & _PAGE_PSE; }
 128
 129 static inline int pmd_large(pmd_t pte) {
 130         return (pmd_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
 131                 (_PAGE_PSE|_PAGE_PRESENT);
 132 }
 133
 134 static inline pte_t pte_mkclean(pte_t pte)      { return __pte(pte_val(pte) & ~_PAGE_DIRTY); }
 135 static inline pte_t pte_mkold(pte_t pte)        { return __pte(pte_val(pte) & ~_PAGE_ACCESSED); }
 136 static inline pte_t pte_wrprotect(pte_t pte)    { return __pte(pte_val(pte) & ~_PAGE_RW); }
 137 static inline pte_t pte_mkexec(pte_t pte)       { return __pte(pte_val(pte) & ~_PAGE_NX); }
 138 static inline pte_t pte_mkdirty(pte_t pte)      { return __pte(pte_val(pte) | _PAGE_DIRTY); }
 139 static inline pte_t pte_mkyoung(pte_t pte)      { return __pte(pte_val(pte) | _PAGE_ACCESSED); }
 140 static inline pte_t pte_mkwrite(pte_t pte)      { return __pte(pte_val(pte) | _PAGE_RW); }
 141 static inline pte_t pte_mkhuge(pte_t pte)       { return __pte(pte_val(pte) | _PAGE_PSE); }
 142 static inline pte_t pte_clrhuge(pte_t pte)      { return __pte(pte_val(pte) & ~_PAGE_PSE); }
 143
 144 extern pteval_t __supported_pte_mask;
 145
 146 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 147 {
 148         return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
 149                       pgprot_val(pgprot)) & __supported_pte_mask);
 150 }
 151
 152 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 153 {
 154         return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
 155                       pgprot_val(pgprot)) & __supported_pte_mask);
 156 }
 157
 158 #endif  /* __ASSEMBLY__ */
 159
 160 #ifdef CONFIG_X86_32
 161 # include "pgtable_32.h"
 162 #else
 163 # include "pgtable_64.h"
 164 #endif
 165
 166 #endif  /* _ASM_X86_PGTABLE_H */