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_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
  22 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
  23
  24 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
  25 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
  26
  27 #define PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
  28 #define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
  29
  30 #define HPAGE_SHIFT             PMD_SHIFT
  31 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  32 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  33 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  34
  35 #define HUGE_MAX_HSTATE 2
  36
  37 #ifndef __ASSEMBLY__
  38 #include <linux/types.h>
  39 #endif
  40
  41 #ifdef CONFIG_X86_64
  42 #include <asm/page_64.h>
  43 #else
  44 #include <asm/page_32.h>
  45 #endif  /* CONFIG_X86_64 */
  46
  47 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  48
  49 #define VM_DATA_DEFAULT_FLAGS \
  50         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  51          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  52
  53
  54 #ifndef __ASSEMBLY__
  55
  56 typedef struct { pgdval_t pgd; } pgd_t;
  57 typedef struct { pgprotval_t pgprot; } pgprot_t;
  58
  59 extern int page_is_ram(unsigned long pagenr);
  60 extern int devmem_is_allowed(unsigned long pagenr);
  61 extern void map_devmem(unsigned long pfn, unsigned long size,
  62                        pgprot_t vma_prot);
  63 extern void unmap_devmem(unsigned long pfn, unsigned long size,
  64                          pgprot_t vma_prot);
  65
  66 extern unsigned long max_low_pfn_mapped;
  67 extern unsigned long max_pfn_mapped;
  68
  69 struct page;
  70
  71 static inline void clear_user_page(void *page, unsigned long vaddr,
  72                                 struct page *pg)
  73 {
  74         clear_page(page);
  75 }
  76
  77 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  78                                 struct page *topage)
  79 {
  80         copy_page(to, from);
  81 }
  82
  83 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  84         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  85 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  86
  87 static inline pgd_t native_make_pgd(pgdval_t val)
  88 {
  89         return (pgd_t) { val };
  90 }
  91
  92 static inline pgdval_t native_pgd_val(pgd_t pgd)
  93 {
  94         return pgd.pgd;
  95 }
  96
  97 #if PAGETABLE_LEVELS >= 3
  98 #if PAGETABLE_LEVELS == 4
  99 typedef struct { pudval_t pud; } pud_t;
 100
 101 static inline pud_t native_make_pud(pmdval_t val)
 102 {
 103         return (pud_t) { val };
 104 }
 105
 106 static inline pudval_t native_pud_val(pud_t pud)
 107 {
 108         return pud.pud;
 109 }
 110 #else   /* PAGETABLE_LEVELS == 3 */
 111 #include <asm-generic/pgtable-nopud.h>
 112
 113 static inline pudval_t native_pud_val(pud_t pud)
 114 {
 115         return native_pgd_val(pud.pgd);
 116 }
 117 #endif  /* PAGETABLE_LEVELS == 4 */
 118
 119 typedef struct { pmdval_t pmd; } pmd_t;
 120
 121 static inline pmd_t native_make_pmd(pmdval_t val)
 122 {
 123         return (pmd_t) { val };
 124 }
 125
 126 static inline pmdval_t native_pmd_val(pmd_t pmd)
 127 {
 128         return pmd.pmd;
 129 }
 130 #else  /* PAGETABLE_LEVELS == 2 */
 131 #include <asm-generic/pgtable-nopmd.h>
 132
 133 static inline pmdval_t native_pmd_val(pmd_t pmd)
 134 {
 135         return native_pgd_val(pmd.pud.pgd);
 136 }
 137 #endif  /* PAGETABLE_LEVELS >= 3 */
 138
 139 static inline pte_t native_make_pte(pteval_t val)
 140 {
 141         return (pte_t) { .pte = val };
 142 }
 143
 144 static inline pteval_t native_pte_val(pte_t pte)
 145 {
 146         return pte.pte;
 147 }
 148
 149 static inline pteval_t native_pte_flags(pte_t pte)
 150 {
 151         return native_pte_val(pte) & PTE_FLAGS_MASK;
 152 }
 153
 154 #define pgprot_val(x)   ((x).pgprot)
 155 #define __pgprot(x)     ((pgprot_t) { (x) } )
 156
 157 #ifdef CONFIG_PARAVIRT
 158 #include <asm/paravirt.h>
 159 #else  /* !CONFIG_PARAVIRT */
 160
 161 #define pgd_val(x)      native_pgd_val(x)
 162 #define __pgd(x)        native_make_pgd(x)
 163
 164 #ifndef __PAGETABLE_PUD_FOLDED
 165 #define pud_val(x)      native_pud_val(x)
 166 #define __pud(x)        native_make_pud(x)
 167 #endif
 168
 169 #ifndef __PAGETABLE_PMD_FOLDED
 170 #define pmd_val(x)      native_pmd_val(x)
 171 #define __pmd(x)        native_make_pmd(x)
 172 #endif
 173
 174 #define pte_val(x)      native_pte_val(x)
 175 #define pte_flags(x)    native_pte_flags(x)
 176 #define __pte(x)        native_make_pte(x)
 177
 178 #endif  /* CONFIG_PARAVIRT */
 179
 180 #define __pa(x)         __phys_addr((unsigned long)(x))
 181 /* __pa_symbol should be used for C visible symbols.
 182    This seems to be the official gcc blessed way to do such arithmetic. */
 183 #define __pa_symbol(x)  __pa(__phys_reloc_hide((unsigned long)(x)))
 184
 185 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 186
 187 #define __boot_va(x)            __va(x)
 188 #define __boot_pa(x)            __pa(x)
 189
 190 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 191 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 192 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 193
 194 #endif  /* __ASSEMBLY__ */
 195
 196 #include <asm-generic/memory_model.h>
 197 #include <asm-generic/page.h>
 198
 199 #define __HAVE_ARCH_GATE_AREA 1
 200
 201 #endif  /* __KERNEL__ */
 202 #endif  /* _ASM_X86_PAGE_H */