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