include/asm-x86/page.h

   1 #ifndef _ASM_X86_PAGE_H
   2 #define _ASM_X86_PAGE_H
   3
   4 #include <linux/const.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      12
   8 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
   9 #define PAGE_MASK       (~(PAGE_SIZE-1))
  10
  11 #ifdef __KERNEL__
  12
  13 #define __PHYSICAL_MASK         ((phys_addr_t)(1ULL << __PHYSICAL_MASK_SHIFT) - 1)
  14 #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  15
  16 /* Cast PAGE_MASK to a signed type so that it is sign-extended if
  17    virtual addresses are 32-bits but physical addresses are larger
  18    (ie, 32-bit PAE). */
  19 #define PHYSICAL_PAGE_MASK      (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
  20
  21 /* PTE_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
  22 #define PTE_MASK                ((pteval_t)PHYSICAL_PAGE_MASK)
  23
  24 #define PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
  25 #define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
  26
  27 #define HPAGE_SHIFT             PMD_SHIFT
  28 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  29 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  30 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  31
  32 /* to align the pointer to the (next) page boundary */
  33 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  34
  35 #ifndef __ASSEMBLY__
  36 #include <linux/types.h>
  37 #endif
  38
  39 #ifdef CONFIG_X86_64
  40 #include <asm/page_64.h>
  41 #else
  42 #include <asm/page_32.h>
  43 #endif  /* CONFIG_X86_64 */
  44
  45 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  46
  47 #define VM_DATA_DEFAULT_FLAGS \
  48         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  49          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  50
  51
  52 #ifndef __ASSEMBLY__
  53
  54 extern int page_is_ram(unsigned long pagenr);
  55 extern int devmem_is_allowed(unsigned long pagenr);
  56
  57 extern unsigned long max_pfn_mapped;
  58
  59 struct page;
  60
  61 static inline void clear_user_page(void *page, unsigned long vaddr,
  62                                 struct page *pg)
  63 {
  64         clear_page(page);
  65 }
  66
  67 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  68                                 struct page *topage)
  69 {
  70         copy_page(to, from);
  71 }
  72
  73 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  74         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  75 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  76
  77 typedef struct { pgdval_t pgd; } pgd_t;
  78 typedef struct { pgprotval_t pgprot; } pgprot_t;
  79
  80 static inline pgd_t native_make_pgd(pgdval_t val)
  81 {
  82         return (pgd_t) { val };
  83 }
  84
  85 static inline pgdval_t native_pgd_val(pgd_t pgd)
  86 {
  87         return pgd.pgd;
  88 }
  89
  90 #if PAGETABLE_LEVELS >= 3
  91 #if PAGETABLE_LEVELS == 4
  92 typedef struct { pudval_t pud; } pud_t;
  93
  94 static inline pud_t native_make_pud(pmdval_t val)
  95 {
  96         return (pud_t) { val };
  97 }
  98
  99 static inline pudval_t native_pud_val(pud_t pud)
 100 {
 101         return pud.pud;
 102 }
 103 #else   /* PAGETABLE_LEVELS == 3 */
 104 #include <asm-generic/pgtable-nopud.h>
 105
 106 static inline pudval_t native_pud_val(pud_t pud)
 107 {
 108         return native_pgd_val(pud.pgd);
 109 }
 110 #endif  /* PAGETABLE_LEVELS == 4 */
 111
 112 typedef struct { pmdval_t pmd; } pmd_t;
 113
 114 static inline pmd_t native_make_pmd(pmdval_t val)
 115 {
 116         return (pmd_t) { val };
 117 }
 118
 119 static inline pmdval_t native_pmd_val(pmd_t pmd)
 120 {
 121         return pmd.pmd;
 122 }
 123 #else  /* PAGETABLE_LEVELS == 2 */
 124 #include <asm-generic/pgtable-nopmd.h>
 125
 126 static inline pmdval_t native_pmd_val(pmd_t pmd)
 127 {
 128         return native_pgd_val(pmd.pud.pgd);
 129 }
 130 #endif  /* PAGETABLE_LEVELS >= 3 */
 131
 132 static inline pte_t native_make_pte(pteval_t val)
 133 {
 134         return (pte_t) { .pte = val };
 135 }
 136
 137 static inline pteval_t native_pte_val(pte_t pte)
 138 {
 139         return pte.pte;
 140 }
 141
 142 #define pgprot_val(x)   ((x).pgprot)
 143 #define __pgprot(x)     ((pgprot_t) { (x) } )
 144
 145 #ifdef CONFIG_PARAVIRT
 146 #include <asm/paravirt.h>
 147 #else  /* !CONFIG_PARAVIRT */
 148
 149 #define pgd_val(x)      native_pgd_val(x)
 150 #define __pgd(x)        native_make_pgd(x)
 151
 152 #ifndef __PAGETABLE_PUD_FOLDED
 153 #define pud_val(x)      native_pud_val(x)
 154 #define __pud(x)        native_make_pud(x)
 155 #endif
 156
 157 #ifndef __PAGETABLE_PMD_FOLDED
 158 #define pmd_val(x)      native_pmd_val(x)
 159 #define __pmd(x)        native_make_pmd(x)
 160 #endif
 161
 162 #define pte_val(x)      native_pte_val(x)
 163 #define __pte(x)        native_make_pte(x)
 164
 165 #endif  /* CONFIG_PARAVIRT */
 166
 167 #define __pa(x)         __phys_addr((unsigned long)(x))
 168 /* __pa_symbol should be used for C visible symbols.
 169    This seems to be the official gcc blessed way to do such arithmetic. */
 170 #define __pa_symbol(x)  __pa(__phys_reloc_hide((unsigned long)(x)))
 171
 172 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 173
 174 #define __boot_va(x)            __va(x)
 175 #define __boot_pa(x)            __pa(x)
 176
 177 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 178 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 179 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 180
 181 #endif  /* __ASSEMBLY__ */
 182
 183 #include <asm-generic/memory_model.h>
 184 #include <asm-generic/page.h>
 185
 186 #define __HAVE_ARCH_GATE_AREA 1
 187
 188 #endif  /* __KERNEL__ */
 189 #endif  /* _ASM_X86_PAGE_H */