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 pte_low, pte_high; } pte_t;
41 typedef struct { unsigned long long pmd; } pmd_t;
42 typedef struct { unsigned long long pgd; } pgd_t;
43 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
44 #else
45 typedef struct { unsigned long pte_low; } pte_t;
46 typedef struct { unsigned long pmd; } pmd_t;
47 typedef struct { unsigned long pgd; } pgd_t;
48 #define pte_val(x) ((x).pte_low)
49 #endif
50 #define PTE_MASK PAGE_MASK
51
52 typedef struct { unsigned long pgprot; } pgprot_t;
53
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 * and CONFIG_HIGHMEM64G options in the kernel configuration.
79 */
80
81 #define __PAGE_OFFSET (0xC0000000)
82
83 #ifndef __ASSEMBLY__
84
85 /*
86 * Tell the user there is some problem. Beep too, so we can
87 * see^H^H^Hhear bugs in early bootup as well!
88 */
89 #define BUG() do { \
90 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
91 __asm__ __volatile__(".byte 0x0f,0x0b"); \
92 } while (0)
93
94 #define PAGE_BUG(page) do { \
95 BUG(); \
96 } while (0)
97
98 /* Pure 2^n version of get_order */
99 extern __inline__ int get_order(unsigned long size)
100 {
101 int order;
102
103 size = (size-1) >> (PAGE_SHIFT-1);
104 order = -1;
105 do {
106 size >>= 1;
107 order++;
108 } while (size);
109 return order;
110 }
111
112 #endif /* __ASSEMBLY__ */
113
114 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
115 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
116 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
117 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
118 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
119
120
121 #endif /* __KERNEL__ */
122
123 #endif /* _I386_PAGE_H */
124
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