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 pagerange_is_ram(unsigned long start, unsigned long end);
  61 extern int devmem_is_allowed(unsigned long pagenr);
  62 extern void map_devmem(unsigned long pfn, unsigned long size,
  63                        pgprot_t vma_prot);
  64 extern void unmap_devmem(unsigned long pfn, unsigned long size,
  65                          pgprot_t vma_prot);
  66
  67 extern unsigned long max_low_pfn_mapped;
  68 extern unsigned long max_pfn_mapped;
  69
  70 struct page;
  71
  72 static inline void clear_user_page(void *page, unsigned long vaddr,
  73                                 struct page *pg)
  74 {
  75         clear_page(page);
  76 }
  77
  78 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  79                                 struct page *topage)
  80 {
  81         copy_page(to, from);
  82 }
  83
  84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  85         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  86 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  87
  88 static inline pgd_t native_make_pgd(pgdval_t val)
  89 {
  90         return (pgd_t) { val };
  91 }
  92
  93 static inline pgdval_t native_pgd_val(pgd_t pgd)
  94 {
  95         return pgd.pgd;
  96 }
  97
  98 #if PAGETABLE_LEVELS >= 3
  99 #if PAGETABLE_LEVELS == 4
 100 typedef struct { pudval_t pud; } pud_t;
 101
 102 static inline pud_t native_make_pud(pmdval_t val)
 103 {
 104         return (pud_t) { val };
 105 }
 106
 107 static inline pudval_t native_pud_val(pud_t pud)
 108 {
 109         return pud.pud;
 110 }
 111 #else   /* PAGETABLE_LEVELS == 3 */
 112 #include <asm-generic/pgtable-nopud.h>
 113
 114 static inline pudval_t native_pud_val(pud_t pud)
 115 {
 116         return native_pgd_val(pud.pgd);
 117 }
 118 #endif  /* PAGETABLE_LEVELS == 4 */
 119
 120 typedef struct { pmdval_t pmd; } pmd_t;
 121
 122 static inline pmd_t native_make_pmd(pmdval_t val)
 123 {
 124         return (pmd_t) { val };
 125 }
 126
 127 static inline pmdval_t native_pmd_val(pmd_t pmd)
 128 {
 129         return pmd.pmd;
 130 }
 131 #else  /* PAGETABLE_LEVELS == 2 */
 132 #include <asm-generic/pgtable-nopmd.h>
 133
 134 static inline pmdval_t native_pmd_val(pmd_t pmd)
 135 {
 136         return native_pgd_val(pmd.pud.pgd);
 137 }
 138 #endif  /* PAGETABLE_LEVELS >= 3 */
 139
 140 static inline pte_t native_make_pte(pteval_t val)
 141 {
 142         return (pte_t) { .pte = val };
 143 }
 144
 145 static inline pteval_t native_pte_val(pte_t pte)
 146 {
 147         return pte.pte;
 148 }
 149
 150 static inline pteval_t native_pte_flags(pte_t pte)
 151 {
 152         return native_pte_val(pte) & PTE_FLAGS_MASK;
 153 }
 154
 155 #define pgprot_val(x)   ((x).pgprot)
 156 #define __pgprot(x)     ((pgprot_t) { (x) } )
 157
 158 #ifdef CONFIG_PARAVIRT
 159 #include <asm/paravirt.h>
 160 #else  /* !CONFIG_PARAVIRT */
 161
 162 #define pgd_val(x)      native_pgd_val(x)
 163 #define __pgd(x)        native_make_pgd(x)
 164
 165 #ifndef __PAGETABLE_PUD_FOLDED
 166 #define pud_val(x)      native_pud_val(x)
 167 #define __pud(x)        native_make_pud(x)
 168 #endif
 169
 170 #ifndef __PAGETABLE_PMD_FOLDED
 171 #define pmd_val(x)      native_pmd_val(x)
 172 #define __pmd(x)        native_make_pmd(x)
 173 #endif
 174
 175 #define pte_val(x)      native_pte_val(x)
 176 #define pte_flags(x)    native_pte_flags(x)
 177 #define __pte(x)        native_make_pte(x)
 178
 179 #endif  /* CONFIG_PARAVIRT */
 180
 181 #define __pa(x)         __phys_addr((unsigned long)(x))
 182 #define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x))
 183 /* __pa_symbol should be used for C visible symbols.
 184    This seems to be the official gcc blessed way to do such arithmetic. */
 185 #define __pa_symbol(x)  __pa(__phys_reloc_hide((unsigned long)(x)))
 186
 187 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 188
 189 #define __boot_va(x)            __va(x)
 190 #define __boot_pa(x)            __pa(x)
 191
 192 /*
 193  * virt_to_page(kaddr) returns a valid pointer if and only if
 194  * virt_addr_valid(kaddr) returns true.
 195  */
 196 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 197 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 198 extern bool __virt_addr_valid(unsigned long kaddr);
 199 #define virt_addr_valid(kaddr)  __virt_addr_valid((unsigned long) (kaddr))
 200
 201 #endif  /* __ASSEMBLY__ */
 202
 203 #include <asm-generic/memory_model.h>
 204 #include <asm-generic/page.h>
 205
 206 #define __HAVE_ARCH_GATE_AREA 1
 207
 208 #endif  /* __KERNEL__ */
 209 #endif /* ASM_X86__PAGE_H */