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 #include <linux/types.h>
   6
   7 /* PAGE_SHIFT determines the page size */
   8 #define PAGE_SHIFT      12
   9 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  10 #define PAGE_MASK       (~(PAGE_SIZE-1))
  11
  12 #define __PHYSICAL_MASK         ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
  13 #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  14
  15 /* Cast PAGE_MASK to a signed type so that it is sign-extended if
  16    virtual addresses are 32-bits but physical addresses are larger
  17    (ie, 32-bit PAE). */
  18 #define PHYSICAL_PAGE_MASK      (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
  19
  20 #define PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
  21 #define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
  22
  23 #define HPAGE_SHIFT             PMD_SHIFT
  24 #define HPAGE_SIZE              (_AC(1,UL) << HPAGE_SHIFT)
  25 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  26 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  27
  28 #define HUGE_MAX_HSTATE 2
  29
  30 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
  31
  32 #define VM_DATA_DEFAULT_FLAGS \
  33         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
  34          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
  35
  36 #ifdef CONFIG_X86_64
  37 #include <asm/page_64_types.h>
  38 #else
  39 #include <asm/page_32_types.h>
  40 #endif  /* CONFIG_X86_64 */
  41
  42 #ifndef __ASSEMBLY__
  43
  44 extern int devmem_is_allowed(unsigned long pagenr);
  45
  46 extern unsigned long max_low_pfn_mapped;
  47 extern unsigned long max_pfn_mapped;
  48
  49 static inline phys_addr_t get_max_mapped(void)
  50 {
  51         return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
  52 }
  53
  54 extern unsigned long init_memory_mapping(unsigned long start,
  55                                          unsigned long end);
  56
  57 extern void initmem_init(void);
  58 extern void free_initmem(void);
  59
  60 #endif  /* !__ASSEMBLY__ */
  61
  62 #endif  /* _ASM_X86_PAGE_DEFS_H */