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