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 /* to align the pointer to the (next) page boundary */
  38 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  39
  40 #ifndef __ASSEMBLY__
  41 #include <linux/types.h>
  42 #endif
  43
  44 #ifdef CONFIG_X86_64
  45 #include <asm/page_64.h>
  46 #else
  47 #include <asm/page_32.h>
  48 #endif  /* CONFIG_X86_64 */
  49
  50 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  51
  52 #define VM_DATA_DEFAULT_FLAGS \
  53         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  54          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  55
  56
  57 #ifndef __ASSEMBLY__
  58
  59 typedef struct { pgdval_t pgd; } pgd_t;
  60 typedef struct { pgprotval_t pgprot; } pgprot_t;
  61
  62 extern int page_is_ram(unsigned long pagenr);
  63 extern int devmem_is_allowed(unsigned long pagenr);
  64 extern void map_devmem(unsigned long pfn, unsigned long size,
  65                        pgprot_t vma_prot);
  66 extern void unmap_devmem(unsigned long pfn, unsigned long size,
  67                          pgprot_t vma_prot);
  68
  69 extern unsigned long max_low_pfn_mapped;
  70 extern unsigned long max_pfn_mapped;
  71
  72 struct page;
  73
  74 static inline void clear_user_page(void *page, unsigned long vaddr,
  75                                 struct page *pg)
  76 {
  77         clear_page(page);
  78 }
  79
  80 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  81                                 struct page *topage)
  82 {
  83         copy_page(to, from);
  84 }
  85
  86 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  87         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  88 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  89
  90 static inline pgd_t native_make_pgd(pgdval_t val)
  91 {
  92         return (pgd_t) { val };
  93 }
  94
  95 static inline pgdval_t native_pgd_val(pgd_t pgd)
  96 {
  97         return pgd.pgd;
  98 }
  99
 100 #if PAGETABLE_LEVELS >= 3
 101 #if PAGETABLE_LEVELS == 4
 102 typedef struct { pudval_t pud; } pud_t;
 103
 104 static inline pud_t native_make_pud(pmdval_t val)
 105 {
 106         return (pud_t) { val };
 107 }
 108
 109 static inline pudval_t native_pud_val(pud_t pud)
 110 {
 111         return pud.pud;
 112 }
 113 #else   /* PAGETABLE_LEVELS == 3 */
 114 #include <asm-generic/pgtable-nopud.h>
 115
 116 static inline pudval_t native_pud_val(pud_t pud)
 117 {
 118         return native_pgd_val(pud.pgd);
 119 }
 120 #endif  /* PAGETABLE_LEVELS == 4 */
 121
 122 typedef struct { pmdval_t pmd; } pmd_t;
 123
 124 static inline pmd_t native_make_pmd(pmdval_t val)
 125 {
 126         return (pmd_t) { val };
 127 }
 128
 129 static inline pmdval_t native_pmd_val(pmd_t pmd)
 130 {
 131         return pmd.pmd;
 132 }
 133 #else  /* PAGETABLE_LEVELS == 2 */
 134 #include <asm-generic/pgtable-nopmd.h>
 135
 136 static inline pmdval_t native_pmd_val(pmd_t pmd)
 137 {
 138         return native_pgd_val(pmd.pud.pgd);
 139 }
 140 #endif  /* PAGETABLE_LEVELS >= 3 */
 141
 142 static inline pte_t native_make_pte(pteval_t val)
 143 {
 144         return (pte_t) { .pte = val };
 145 }
 146
 147 static inline pteval_t native_pte_val(pte_t pte)
 148 {
 149         return pte.pte;
 150 }
 151
 152 static inline pteval_t native_pte_flags(pte_t pte)
 153 {
 154         return native_pte_val(pte) & PTE_FLAGS_MASK;
 155 }
 156
 157 #define pgprot_val(x)   ((x).pgprot)
 158 #define __pgprot(x)     ((pgprot_t) { (x) } )
 159
 160 #ifdef CONFIG_PARAVIRT
 161 #include <asm/paravirt.h>
 162 #else  /* !CONFIG_PARAVIRT */
 163
 164 #define pgd_val(x)      native_pgd_val(x)
 165 #define __pgd(x)        native_make_pgd(x)
 166
 167 #ifndef __PAGETABLE_PUD_FOLDED
 168 #define pud_val(x)      native_pud_val(x)
 169 #define __pud(x)        native_make_pud(x)
 170 #endif
 171
 172 #ifndef __PAGETABLE_PMD_FOLDED
 173 #define pmd_val(x)      native_pmd_val(x)
 174 #define __pmd(x)        native_make_pmd(x)
 175 #endif
 176
 177 #define pte_val(x)      native_pte_val(x)
 178 #define pte_flags(x)    native_pte_flags(x)
 179 #define __pte(x)        native_make_pte(x)
 180
 181 #endif  /* CONFIG_PARAVIRT */
 182
 183 #define __pa(x)         __phys_addr((unsigned long)(x))
 184 /* __pa_symbol should be used for C visible symbols.
 185    This seems to be the official gcc blessed way to do such arithmetic. */
 186 #define __pa_symbol(x)  __pa(__phys_reloc_hide((unsigned long)(x)))
 187
 188 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 189
 190 #define __boot_va(x)            __va(x)
 191 #define __boot_pa(x)            __pa(x)
 192
 193 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 194 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 195 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 196
 197 #endif  /* __ASSEMBLY__ */
 198
 199 #include <asm-generic/memory_model.h>
 200 #include <asm-generic/page.h>
 201
 202 #define __HAVE_ARCH_GATE_AREA 1
 203
 204 #endif  /* __KERNEL__ */
 205 #endif  /* _ASM_X86_PAGE_H */