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 typedef struct { pgdval_t pgd; } pgd_t;
  55 typedef struct { pgprotval_t pgprot; } pgprot_t;
  56
  57 extern int page_is_ram(unsigned long pagenr);
  58 extern int devmem_is_allowed(unsigned long pagenr);
  59 extern void map_devmem(unsigned long pfn, unsigned long size,
  60                        pgprot_t vma_prot);
  61 extern void unmap_devmem(unsigned long pfn, unsigned long size,
  62                          pgprot_t vma_prot);
  63
  64 extern unsigned long max_low_pfn_mapped;
  65 extern unsigned long max_pfn_mapped;
  66
  67 struct page;
  68
  69 static inline void clear_user_page(void *page, unsigned long vaddr,
  70                                 struct page *pg)
  71 {
  72         clear_page(page);
  73 }
  74
  75 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  76                                 struct page *topage)
  77 {
  78         copy_page(to, from);
  79 }
  80
  81 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  82         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  83 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  84
  85 static inline pgd_t native_make_pgd(pgdval_t val)
  86 {
  87         return (pgd_t) { val };
  88 }
  89
  90 static inline pgdval_t native_pgd_val(pgd_t pgd)
  91 {
  92         return pgd.pgd;
  93 }
  94
  95 #if PAGETABLE_LEVELS >= 3
  96 #if PAGETABLE_LEVELS == 4
  97 typedef struct { pudval_t pud; } pud_t;
  98
  99 static inline pud_t native_make_pud(pmdval_t val)
 100 {
 101         return (pud_t) { val };
 102 }
 103
 104 static inline pudval_t native_pud_val(pud_t pud)
 105 {
 106         return pud.pud;
 107 }
 108 #else   /* PAGETABLE_LEVELS == 3 */
 109 #include <asm-generic/pgtable-nopud.h>
 110
 111 static inline pudval_t native_pud_val(pud_t pud)
 112 {
 113         return native_pgd_val(pud.pgd);
 114 }
 115 #endif  /* PAGETABLE_LEVELS == 4 */
 116
 117 typedef struct { pmdval_t pmd; } pmd_t;
 118
 119 static inline pmd_t native_make_pmd(pmdval_t val)
 120 {
 121         return (pmd_t) { val };
 122 }
 123
 124 static inline pmdval_t native_pmd_val(pmd_t pmd)
 125 {
 126         return pmd.pmd;
 127 }
 128 #else  /* PAGETABLE_LEVELS == 2 */
 129 #include <asm-generic/pgtable-nopmd.h>
 130
 131 static inline pmdval_t native_pmd_val(pmd_t pmd)
 132 {
 133         return native_pgd_val(pmd.pud.pgd);
 134 }
 135 #endif  /* PAGETABLE_LEVELS >= 3 */
 136
 137 static inline pte_t native_make_pte(pteval_t val)
 138 {
 139         return (pte_t) { .pte = val };
 140 }
 141
 142 static inline pteval_t native_pte_val(pte_t pte)
 143 {
 144         return pte.pte;
 145 }
 146
 147 #define pgprot_val(x)   ((x).pgprot)
 148 #define __pgprot(x)     ((pgprot_t) { (x) } )
 149
 150 #ifdef CONFIG_PARAVIRT
 151 #include <asm/paravirt.h>
 152 #else  /* !CONFIG_PARAVIRT */
 153
 154 #define pgd_val(x)      native_pgd_val(x)
 155 #define __pgd(x)        native_make_pgd(x)
 156
 157 #ifndef __PAGETABLE_PUD_FOLDED
 158 #define pud_val(x)      native_pud_val(x)
 159 #define __pud(x)        native_make_pud(x)
 160 #endif
 161
 162 #ifndef __PAGETABLE_PMD_FOLDED
 163 #define pmd_val(x)      native_pmd_val(x)
 164 #define __pmd(x)        native_make_pmd(x)
 165 #endif
 166
 167 #define pte_val(x)      native_pte_val(x)
 168 #define pte_flags(x)    native_pte_val(x)
 169 #define __pte(x)        native_make_pte(x)
 170
 171 #endif  /* CONFIG_PARAVIRT */
 172
 173 #define __pa(x)         __phys_addr((unsigned long)(x))
 174 /* __pa_symbol should be used for C visible symbols.
 175    This seems to be the official gcc blessed way to do such arithmetic. */
 176 #define __pa_symbol(x)  __pa(__phys_reloc_hide((unsigned long)(x)))
 177
 178 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 179
 180 #define __boot_va(x)            __va(x)
 181 #define __boot_pa(x)            __pa(x)
 182
 183 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 184 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 185 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 186
 187 #endif  /* __ASSEMBLY__ */
 188
 189 #include <asm-generic/memory_model.h>
 190 #include <asm-generic/page.h>
 191
 192 #define __HAVE_ARCH_GATE_AREA 1
 193
 194 #endif  /* __KERNEL__ */
 195 #endif  /* _ASM_X86_PAGE_H */