arch/x86/include/asm/page_types.h

   1 #ifndef _ASM_X86_PAGE_DEFS_H
   2 #define _ASM_X86_PAGE_DEFS_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 #define __PHYSICAL_MASK         ((phys_addr_t)(1ULL << __PHYSICAL_MASK_SHIFT) - 1)
  12 #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  13
  14 /* Cast PAGE_MASK to a signed type so that it is sign-extended if
  15    virtual addresses are 32-bits but physical addresses are larger
  16    (ie, 32-bit PAE). */
  17 #define PHYSICAL_PAGE_MASK      (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
  18
  19 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
  20 #define PTE_PFN_MASK            ((pteval_t)PHYSICAL_PAGE_MASK)
  21
  22 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
  23 #define PTE_FLAGS_MASK          (~PTE_PFN_MASK)
  24
  25 #define PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
  26 #define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
  27
  28 #define HPAGE_SHIFT             PMD_SHIFT
  29 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  30 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  31 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  32
  33 #define HUGE_MAX_HSTATE 2
  34
  35 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  36
  37 #define VM_DATA_DEFAULT_FLAGS \
  38         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  39          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  40
  41 #ifdef CONFIG_X86_64
  42 #include <asm/page_64_types.h>
  43 #else
  44 #include <asm/page_32_types.h>
  45 #endif  /* CONFIG_X86_64 */
  46
  47 #ifndef __ASSEMBLY__
  48
  49 #include <linux/types.h>
  50
  51 typedef struct { pgdval_t pgd; } pgd_t;
  52 typedef struct { pgprotval_t pgprot; } pgprot_t;
  53
  54 #if PAGETABLE_LEVELS > 3
  55 typedef struct { pudval_t pud; } pud_t;
  56 #endif
  57
  58 #if PAGETABLE_LEVELS > 2
  59 typedef struct { pmdval_t pmd; } pmd_t;
  60 #endif
  61
  62 typedef struct page *pgtable_t;
  63
  64 extern int page_is_ram(unsigned long pagenr);
  65 extern int pagerange_is_ram(unsigned long start, unsigned long end);
  66 extern int devmem_is_allowed(unsigned long pagenr);
  67 extern void map_devmem(unsigned long pfn, unsigned long size,
  68                        pgprot_t vma_prot);
  69 extern void unmap_devmem(unsigned long pfn, unsigned long size,
  70                          pgprot_t vma_prot);
  71
  72 extern unsigned long max_low_pfn_mapped;
  73 extern unsigned long max_pfn_mapped;
  74
  75 #endif  /* !__ASSEMBLY__ */
  76
  77 #endif  /* _ASM_X86_PAGE_DEFS_H */