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Linux/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 PMD_PAGE_SIZE           (_AC(1, UL) << PMD_SHIFT)
 13 #define PMD_PAGE_MASK           (~(PMD_PAGE_SIZE-1))
 14 
 15 #define PUD_PAGE_SIZE           (_AC(1, UL) << PUD_SHIFT)
 16 #define PUD_PAGE_MASK           (~(PUD_PAGE_SIZE-1))
 17 
 18 #define __PHYSICAL_MASK         ((phys_addr_t)((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
 19 #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
 20 
 21 /* Cast *PAGE_MASK to a signed type so that it is sign-extended if
 22    virtual addresses are 32-bits but physical addresses are larger
 23    (ie, 32-bit PAE). */
 24 #define PHYSICAL_PAGE_MASK      (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
 25 #define PHYSICAL_PMD_PAGE_MASK  (((signed long)PMD_PAGE_MASK) & __PHYSICAL_MASK)
 26 #define PHYSICAL_PUD_PAGE_MASK  (((signed long)PUD_PAGE_MASK) & __PHYSICAL_MASK)
 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 #define __PHYSICAL_START        ALIGN(CONFIG_PHYSICAL_START, \
 42                                       CONFIG_PHYSICAL_ALIGN)
 43 
 44 #define __START_KERNEL          (__START_KERNEL_map + __PHYSICAL_START)
 45 
 46 #ifdef CONFIG_X86_64
 47 #include <asm/page_64_types.h>
 48 #define IOREMAP_MAX_ORDER       (PUD_SHIFT)
 49 #else
 50 #include <asm/page_32_types.h>
 51 #define IOREMAP_MAX_ORDER       (PMD_SHIFT)
 52 #endif  /* CONFIG_X86_64 */
 53 
 54 #ifndef __ASSEMBLY__
 55 
 56 extern int devmem_is_allowed(unsigned long pagenr);
 57 
 58 extern unsigned long max_low_pfn_mapped;
 59 extern unsigned long max_pfn_mapped;
 60 
 61 static inline phys_addr_t get_max_mapped(void)
 62 {
 63         return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT;
 64 }
 65 
 66 bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn);
 67 
 68 extern unsigned long init_memory_mapping(unsigned long start,
 69                                          unsigned long end);
 70 
 71 extern void initmem_init(void);
 72 
 73 #endif  /* !__ASSEMBLY__ */
 74 
 75 #endif  /* _ASM_X86_PAGE_DEFS_H */
 76 

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