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 #include <linux/config.h>
  13
  14 #ifdef CONFIG_X86_USE_3DNOW
  15
  16 #include <asm/mmx.h>
  17
  18 #define clear_page(page)        mmx_clear_page(page)
  19 #define copy_page(to,from)      mmx_copy_page(to,from)
  20
  21 #else
  22
  23 /*
  24  *      On older X86 processors its not a win to use MMX here it seems.
  25  *      Maybe the K6-III ?
  26  */
  27
  28 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  29 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  30
  31 #endif
  32
  33 #define clear_user_page(page, vaddr)    clear_page(page)
  34 #define copy_user_page(to, from, vaddr) copy_page(to, from)
  35
  36 /*
  37  * These are used to make use of C type-checking..
  38  */
  39 #if CONFIG_X86_PAE
  40 typedef struct { unsigned long long pte; } pte_t;
  41 typedef struct { unsigned long long pmd; } pmd_t;
  42 typedef struct { unsigned long long pgd; } pgd_t;
  43 #define PTE_MASK        (~(unsigned long long) (PAGE_SIZE-1))
  44 #else
  45 typedef struct { unsigned long pte; } pte_t;
  46 typedef struct { unsigned long pmd; } pmd_t;
  47 typedef struct { unsigned long pgd; } pgd_t;
  48 #define PTE_MASK        PAGE_MASK
  49 #endif
  50
  51 typedef struct { unsigned long pgprot; } pgprot_t;
  52
  53 #define pte_val(x)      ((x).pte)
  54 #define pmd_val(x)      ((x).pmd)
  55 #define pgd_val(x)      ((x).pgd)
  56 #define pgprot_val(x)   ((x).pgprot)
  57
  58 #define __pte(x) ((pte_t) { (x) } )
  59 #define __pmd(x) ((pmd_t) { (x) } )
  60 #define __pgd(x) ((pgd_t) { (x) } )
  61 #define __pgprot(x)     ((pgprot_t) { (x) } )
  62
  63 #endif /* !__ASSEMBLY__ */
  64
  65 /* to align the pointer to the (next) page boundary */
  66 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
  67
  68 /*
  69  * This handles the memory map.. We could make this a config
  70  * option, but too many people screw it up, and too few need
  71  * it.
  72  *
  73  * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
  74  * a virtual address space of one gigabyte, which limits the
  75  * amount of physical memory you can use to about 950MB.
  76  *
  77  * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
  78  * amd CONFIG_HIGHMEM64G options in the kernel configuration.
  79  */
  80
  81 #define __PAGE_OFFSET           (0xC0000000)
  82
  83 #ifndef __ASSEMBLY__
  84
  85 extern int console_loglevel;
  86
  87 /*
  88  * Tell the user there is some problem. Beep too, so we can
  89  * see^H^H^Hhear bugs in early bootup as well!
  90  */
  91 #define BUG() do { \
  92         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
  93         __asm__ __volatile__(".byte 0x0f,0x0b"); \
  94 } while (0)
  95
  96 #define PAGE_BUG(page) do { \
  97         BUG(); \
  98 } while (0)
  99
 100 /* Pure 2^n version of get_order */
 101 extern __inline__ int get_order(unsigned long size)
 102 {
 103         int order;
 104
 105         size = (size-1) >> (PAGE_SHIFT-1);
 106         order = -1;
 107         do {
 108                 size >>= 1;
 109                 order++;
 110         } while (size);
 111         return order;
 112 }
 113
 114 #endif /* __ASSEMBLY__ */
 115
 116 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 117 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 118 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 119 #define MAP_NR(addr)            (__pa(addr) >> PAGE_SHIFT)
 120 #define PHYSMAP_NR(addr)        ((unsigned long)(addr) >> PAGE_SHIFT)
 121
 122 #endif /* __KERNEL__ */
 123
 124 #endif /* _I386_PAGE_H */