include/asm-x86_64/page.h

   1 #ifndef _X86_64_PAGE_H
   2 #define _X86_64_PAGE_H
   3
   4 #include <linux/config.h>
   5
   6 /* PAGE_SHIFT determines the page size */
   7 #define PAGE_SHIFT      12
   8 #ifdef __ASSEMBLY__
   9 #define PAGE_SIZE       (0x1 << PAGE_SHIFT)
  10 #else
  11 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  12 #endif
  13 #define PAGE_MASK       (~(PAGE_SIZE-1))
  14 #define PHYSICAL_PAGE_MASK      (~(PAGE_SIZE-1) & (__PHYSICAL_MASK << PAGE_SHIFT))
  15
  16 #define THREAD_ORDER 1
  17 #ifdef __ASSEMBLY__
  18 #define THREAD_SIZE  (1 << (PAGE_SHIFT + THREAD_ORDER))
  19 #else
  20 #define THREAD_SIZE  (1UL << (PAGE_SHIFT + THREAD_ORDER))
  21 #endif
  22 #define CURRENT_MASK (~(THREAD_SIZE-1))
  23
  24 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
  25 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
  26
  27 #define HPAGE_SHIFT PMD_SHIFT
  28 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  29 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  30 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  31
  32 #ifdef __KERNEL__
  33 #ifndef __ASSEMBLY__
  34
  35 void clear_page(void *);
  36 void copy_page(void *, void *);
  37
  38 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  39 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  40
  41 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
  42 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  43 /*
  44  * These are used to make use of C type-checking..
  45  */
  46 typedef struct { unsigned long pte; } pte_t;
  47 typedef struct { unsigned long pmd; } pmd_t;
  48 typedef struct { unsigned long pud; } pud_t;
  49 typedef struct { unsigned long pgd; } pgd_t;
  50 #define PTE_MASK        PHYSICAL_PAGE_MASK
  51
  52 typedef struct { unsigned long pgprot; } pgprot_t;
  53
  54 #define pte_val(x)      ((x).pte)
  55 #define pmd_val(x)      ((x).pmd)
  56 #define pud_val(x)      ((x).pud)
  57 #define pgd_val(x)      ((x).pgd)
  58 #define pgprot_val(x)   ((x).pgprot)
  59
  60 #define __pte(x) ((pte_t) { (x) } )
  61 #define __pmd(x) ((pmd_t) { (x) } )
  62 #define __pud(x) ((pud_t) { (x) } )
  63 #define __pgd(x) ((pgd_t) { (x) } )
  64 #define __pgprot(x)     ((pgprot_t) { (x) } )
  65
  66 #define __START_KERNEL          0xffffffff80100000UL
  67 #define __START_KERNEL_map      0xffffffff80000000UL
  68 #define __PAGE_OFFSET           0xffff810000000000UL
  69
  70 #else
  71 #define __START_KERNEL          0xffffffff80100000
  72 #define __START_KERNEL_map      0xffffffff80000000
  73 #define __PAGE_OFFSET           0xffff810000000000
  74 #endif /* !__ASSEMBLY__ */
  75
  76 /* to align the pointer to the (next) page boundary */
  77 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  78
  79 /* See Documentation/x86_64/mm.txt for a description of the memory map. */
  80 #define __PHYSICAL_MASK_SHIFT   46
  81 #define __PHYSICAL_MASK         ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
  82 #define __VIRTUAL_MASK_SHIFT    48
  83 #define __VIRTUAL_MASK          ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
  84
  85 #define KERNEL_TEXT_SIZE  (40UL*1024*1024)
  86 #define KERNEL_TEXT_START 0xffffffff80000000UL
  87
  88 #ifndef __ASSEMBLY__
  89
  90 #include <asm/bug.h>
  91
  92 /* Pure 2^n version of get_order */
  93 extern __inline__ int get_order(unsigned long size)
  94 {
  95         int order;
  96
  97         size = (size-1) >> (PAGE_SHIFT-1);
  98         order = -1;
  99         do {
 100                 size >>= 1;
 101                 order++;
 102         } while (size);
 103         return order;
 104 }
 105
 106 #endif /* __ASSEMBLY__ */
 107
 108 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 109
 110 /* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
 111    Otherwise you risk miscompilation. */
 112 #define __pa(x)                 (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
 113 /* __pa_symbol should be used for C visible symbols.
 114    This seems to be the official gcc blessed way to do such arithmetic. */
 115 #define __pa_symbol(x)          \
 116         ({unsigned long v;  \
 117           asm("" : "=r" (v) : "0" (x)); \
 118           __pa(v); })
 119
 120 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 121 #ifndef CONFIG_DISCONTIGMEM
 122 #define pfn_to_page(pfn)        (mem_map + (pfn))
 123 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 124 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 125 #endif
 126
 127 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 128 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 129 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 130
 131 #define VM_DATA_DEFAULT_FLAGS \
 132         (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
 133          VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 134
 135 #define __HAVE_ARCH_GATE_AREA 1
 136
 137 #endif /* __KERNEL__ */
 138
 139 #endif /* _X86_64_PAGE_H */