1 #ifndef _ALPHA_PAGE_H
2 #define _ALPHA_PAGE_H
3
4 /* PAGE_SHIFT determines the page size */
5 #define PAGE_SHIFT 13
6 #define PAGE_SIZE (1UL << PAGE_SHIFT)
7 #define PAGE_MASK (~(PAGE_SIZE-1))
8
9 #ifdef __KERNEL__
10
11 #ifndef __ASSEMBLY__
12
13 #define STRICT_MM_TYPECHECKS
14
15 /*
16 * A _lot_ of the kernel time is spent clearing pages, so
17 * do this as fast as we possibly can. Also, doing this
18 * as a separate inline function (rather than memset())
19 * results in clearer kernel profiles as we see _who_ is
20 * doing page clearing or copying.
21 */
22 static inline void clear_page(void * page)
23 {
24 unsigned long count = PAGE_SIZE/64;
25 unsigned long *ptr = (unsigned long *)page;
26
27 do {
28 ptr[0] = 0;
29 ptr[1] = 0;
30 ptr[2] = 0;
31 ptr[3] = 0;
32 count--;
33 ptr[4] = 0;
34 ptr[5] = 0;
35 ptr[6] = 0;
36 ptr[7] = 0;
37 ptr += 8;
38 } while (count);
39 }
40
41 #define clear_user_page(page, vaddr) clear_page(page)
42
43 static inline void copy_page(void * _to, void * _from)
44 {
45 unsigned long count = PAGE_SIZE/64;
46 unsigned long *to = (unsigned long *)_to;
47 unsigned long *from = (unsigned long *)_from;
48
49 do {
50 unsigned long a,b,c,d,e,f,g,h;
51 a = from[0];
52 b = from[1];
53 c = from[2];
54 d = from[3];
55 e = from[4];
56 f = from[5];
57 g = from[6];
58 h = from[7];
59 count--;
60 from += 8;
61 to[0] = a;
62 to[1] = b;
63 to[2] = c;
64 to[3] = d;
65 to[4] = e;
66 to[5] = f;
67 to[6] = g;
68 to[7] = h;
69 to += 8;
70 } while (count);
71 }
72
73 #define copy_user_page(to, from, vaddr) copy_page(to, from)
74
75 #ifdef STRICT_MM_TYPECHECKS
76 /*
77 * These are used to make use of C type-checking..
78 */
79 typedef struct { unsigned long pte; } pte_t;
80 typedef struct { unsigned long pmd; } pmd_t;
81 typedef struct { unsigned long pgd; } pgd_t;
82 typedef struct { unsigned long pgprot; } pgprot_t;
83
84 #define pte_val(x) ((x).pte)
85 #define pmd_val(x) ((x).pmd)
86 #define pgd_val(x) ((x).pgd)
87 #define pgprot_val(x) ((x).pgprot)
88
89 #define __pte(x) ((pte_t) { (x) } )
90 #define __pgd(x) ((pgd_t) { (x) } )
91 #define __pgprot(x) ((pgprot_t) { (x) } )
92
93 #else
94 /*
95 * .. while these make it easier on the compiler
96 */
97 typedef unsigned long pte_t;
98 typedef unsigned long pmd_t;
99 typedef unsigned long pgd_t;
100 typedef unsigned long pgprot_t;
101
102 #define pte_val(x) (x)
103 #define pmd_val(x) (x)
104 #define pgd_val(x) (x)
105 #define pgprot_val(x) (x)
106
107 #define __pte(x) (x)
108 #define __pgd(x) (x)
109 #define __pgprot(x) (x)
110
111 #endif /* STRICT_MM_TYPECHECKS */
112
113 #define BUG() __asm__ __volatile__("call_pal 129 # bugchk")
114 #define PAGE_BUG(page) BUG()
115
116 /* Pure 2^n version of get_order */
117 extern __inline__ int get_order(unsigned long size)
118 {
119 int order;
120
121 size = (size-1) >> (PAGE_SHIFT-1);
122 order = -1;
123 do {
124 size >>= 1;
125 order++;
126 } while (size);
127 return order;
128 }
129
130 #endif /* !ASSEMBLY */
131
132 /* to align the pointer to the (next) page boundary */
133 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
134
135 #ifdef USE_48_BIT_KSEG
136 #define PAGE_OFFSET 0xffff800000000000
137 #else
138 #define PAGE_OFFSET 0xfffffc0000000000
139 #endif
140
141 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
142 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
143 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
144 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
145
146 #endif /* __KERNEL__ */
147
148 #endif /* _ALPHA_PAGE_H */
149
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