include/asm-i386/page.h

   1 #ifndef _I386_PAGE_H
   2 #define _I386_PAGE_H
   3
   4 /* PAGE_SHIFT determines the page size */
   5 #define PAGE_SHIFT      12
   6 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
   7 #define PAGE_MASK       (~(PAGE_SIZE-1))
   8
   9 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
  10 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
  11
  12 #ifdef __KERNEL__
  13 #ifndef __ASSEMBLY__
  14
  15 #include <linux/config.h>
  16
  17 #ifdef CONFIG_X86_USE_3DNOW
  18
  19 #include <asm/mmx.h>
  20
  21 #define clear_page(page)        mmx_clear_page((void *)(page))
  22 #define copy_page(to,from)      mmx_copy_page(to,from)
  23
  24 #else
  25
  26 /*
  27  *      On older X86 processors it's not a win to use MMX here it seems.
  28  *      Maybe the K6-III ?
  29  */
  30
  31 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  32 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  33
  34 #endif
  35
  36 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  37 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  38
  39 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
  40 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  41
  42 /*
  43  * These are used to make use of C type-checking..
  44  */
  45 extern int nx_enabled;
  46 #ifdef CONFIG_X86_PAE
  47 extern unsigned long long __supported_pte_mask;
  48 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  49 typedef struct { unsigned long long pmd; } pmd_t;
  50 typedef struct { unsigned long long pgd; } pgd_t;
  51 typedef struct { unsigned long long pgprot; } pgprot_t;
  52 #define pmd_val(x)      ((x).pmd)
  53 #define pte_val(x)      ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  54 #define __pmd(x) ((pmd_t) { (x) } )
  55 #define HPAGE_SHIFT     21
  56 #else
  57 typedef struct { unsigned long pte_low; } pte_t;
  58 typedef struct { unsigned long pgd; } pgd_t;
  59 typedef struct { unsigned long pgprot; } pgprot_t;
  60 #define boot_pte_t pte_t /* or would you rather have a typedef */
  61 #define pte_val(x)      ((x).pte_low)
  62 #define HPAGE_SHIFT     22
  63 #endif
  64 #define PTE_MASK        PAGE_MASK
  65
  66 #ifdef CONFIG_HUGETLB_PAGE
  67 #define HPAGE_SIZE      ((1UL) << HPAGE_SHIFT)
  68 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  69 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  70 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  71 #endif
  72
  73 #define pgd_val(x)      ((x).pgd)
  74 #define pgprot_val(x)   ((x).pgprot)
  75
  76 #define __pte(x) ((pte_t) { (x) } )
  77 #define __pgd(x) ((pgd_t) { (x) } )
  78 #define __pgprot(x)     ((pgprot_t) { (x) } )
  79
  80 #endif /* !__ASSEMBLY__ */
  81
  82 /* to align the pointer to the (next) page boundary */
  83 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  84
  85 /*
  86  * This handles the memory map.. We could make this a config
  87  * option, but too many people screw it up, and too few need
  88  * it.
  89  *
  90  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  91  * a virtual address space of one gigabyte, which limits the
  92  * amount of physical memory you can use to about 950MB.
  93  *
  94  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  95  * and CONFIG_HIGHMEM64G options in the kernel configuration.
  96  */
  97
  98 #ifndef __ASSEMBLY__
  99
 100 /*
 101  * This much address space is reserved for vmalloc() and iomap()
 102  * as well as fixmap mappings.
 103  */
 104 extern unsigned int __VMALLOC_RESERVE;
 105
 106 /* Pure 2^n version of get_order */
 107 static __inline__ int get_order(unsigned long size)
 108 {
 109         int order;
 110
 111         size = (size-1) >> (PAGE_SHIFT-1);
 112         order = -1;
 113         do {
 114                 size >>= 1;
 115                 order++;
 116         } while (size);
 117         return order;
 118 }
 119
 120 extern int sysctl_legacy_va_layout;
 121
 122 #endif /* __ASSEMBLY__ */
 123
 124 #ifdef __ASSEMBLY__
 125 #define __PAGE_OFFSET           (0xC0000000)
 126 #else
 127 #define __PAGE_OFFSET           (0xC0000000UL)
 128 #endif
 129
 130
 131 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 132 #define VMALLOC_RESERVE         ((unsigned long)__VMALLOC_RESERVE)
 133 #define MAXMEM                  (-__PAGE_OFFSET-__VMALLOC_RESERVE)
 134 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 135 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 136 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 137 #ifndef CONFIG_DISCONTIGMEM
 138 #define pfn_to_page(pfn)        (mem_map + (pfn))
 139 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 140 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 141 #endif /* !CONFIG_DISCONTIGMEM */
 142 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 143
 144 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 145
 146 #define VM_DATA_DEFAULT_FLAGS \
 147         (VM_READ | VM_WRITE | \
 148         ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
 149                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 150
 151 #endif /* __KERNEL__ */
 152
 153 #endif /* _I386_PAGE_H */