i386/linux-2.3.21/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 #ifdef __KERNEL__
  10 #ifndef __ASSEMBLY__
  11
  12 #define STRICT_MM_TYPECHECKS
  13
  14 #include <linux/config.h>
  15
  16 #ifdef CONFIG_X86_USE_3DNOW
  17
  18 #include <asm/mmx.h>
  19
  20 #define clear_page(page)        mmx_clear_page(page)
  21 #define copy_page(to,from)      mmx_copy_page(to,from)
  22
  23 #else
  24
  25 /*
  26  *      On older X86 processors its not a win to use MMX here it seems.
  27  *      Maybe the K6-III ?
  28  */
  29
  30 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  31 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  32
  33 #endif
  34
  35 #ifdef STRICT_MM_TYPECHECKS
  36 /*
  37  * These are used to make use of C type-checking..
  38  */
  39 typedef struct { unsigned long pte; } pte_t;
  40 typedef struct { unsigned long pmd; } pmd_t;
  41 typedef struct { unsigned long pgd; } pgd_t;
  42 typedef struct { unsigned long pgprot; } pgprot_t;
  43
  44 #define pte_val(x)      ((x).pte)
  45 #define pmd_val(x)      ((x).pmd)
  46 #define pgd_val(x)      ((x).pgd)
  47 #define pgprot_val(x)   ((x).pgprot)
  48
  49 #define __pte(x)        ((pte_t) { (x) } )
  50 #define __pmd(x)        ((pmd_t) { (x) } )
  51 #define __pgd(x)        ((pgd_t) { (x) } )
  52 #define __pgprot(x)     ((pgprot_t) { (x) } )
  53
  54 #else
  55 /*
  56  * .. while these make it easier on the compiler
  57  */
  58 typedef unsigned long pte_t;
  59 typedef unsigned long pmd_t;
  60 typedef unsigned long pgd_t;
  61 typedef unsigned long pgprot_t;
  62
  63 #define pte_val(x)      (x)
  64 #define pmd_val(x)      (x)
  65 #define pgd_val(x)      (x)
  66 #define pgprot_val(x)   (x)
  67
  68 #define __pte(x)        (x)
  69 #define __pmd(x)        (x)
  70 #define __pgd(x)        (x)
  71 #define __pgprot(x)     (x)
  72
  73 #endif
  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 /*
  80  * This handles the memory map.. We could make this a config
  81  * option, but too many people screw it up, and too few need
  82  * it.
  83  *
  84  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  85  * a virtual address space of one gigabyte, which limits the
  86  * amount of physical memory you can use to about 950MB. If
  87  * you want to use more physical memory, change this define.
  88  *
  89  * For example, if you have 2GB worth of physical memory, you
  90  * could change this define to 0x80000000, which gives the
  91  * kernel 2GB of virtual memory (enough to most of your physical memory
  92  * as the kernel needs a bit extra for various io-memory mappings)
  93  *
  94  * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
  95  *
  96  *      arch/i386/vmlinux.lds
  97  *
  98  * which has the same constant encoded..
  99  */
 100
 101 #include <asm/page_offset.h>
 102
 103 #define __PAGE_OFFSET           (PAGE_OFFSET_RAW)
 104
 105 #ifndef __ASSEMBLY__
 106
 107 #define BUG() do { \
 108         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
 109         __asm__ __volatile__(".byte 0x0f,0x0b"); \
 110 } while (0)
 111
 112 #define PAGE_BUG(page) do { \
 113         BUG(); \
 114 } while (0)
 115
 116 #endif /* __ASSEMBLY__ */
 117
 118 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 119 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 120 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 121 #define MAP_NR(addr)            (__pa(addr) >> PAGE_SHIFT)
 122 #define PHYSMAP_NR(addr)        ((unsigned long)(addr) >> PAGE_SHIFT)
 123
 124 #endif /* __KERNEL__ */
 125
 126 #endif /* _I386_PAGE_H */