1 #ifndef __ASM_SH_PAGE_H
2 #define __ASM_SH_PAGE_H
3
4 /*
5 * Copyright (C) 1999 Niibe Yutaka
6 */
7
8 /*
9 [ P0/U0 (virtual) ] 0x00000000 <------ User space
10 [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
11 [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
12 [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
13 [ P4 control ] 0xE0000000
14 */
15
16 #include <linux/config.h>
17
18 /* PAGE_SHIFT determines the page size */
19 #define PAGE_SHIFT 12
20 #define PAGE_SIZE (1UL << PAGE_SHIFT)
21 #define PAGE_MASK (~(PAGE_SIZE-1))
22 #define PTE_MASK PAGE_MASK
23
24 #ifdef __KERNEL__
25 #ifndef __ASSEMBLY__
26
27 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
28 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
29
30 #if defined(__sh3__)
31 #define clear_user_page(page, vaddr) clear_page(page)
32 #define copy_user_page(to, from, vaddr) copy_page(to, from)
33 #elif defined(__SH4__)
34 extern void clear_user_page(void *to, unsigned long address);
35 extern void copy_user_page(void *to, void *from, unsigned long address);
36 #endif
37
38 /*
39 * These are used to make use of C type-checking..
40 */
41 typedef struct { unsigned long pte; } pte_t;
42 typedef struct { unsigned long pmd; } pmd_t;
43 typedef struct { unsigned long pgd; } pgd_t;
44 typedef struct { unsigned long pgprot; } pgprot_t;
45
46 #define pte_val(x) ((x).pte)
47 #define pmd_val(x) ((x).pmd)
48 #define pgd_val(x) ((x).pgd)
49 #define pgprot_val(x) ((x).pgprot)
50
51 #define __pte(x) ((pte_t) { (x) } )
52 #define __pmd(x) ((pmd_t) { (x) } )
53 #define __pgd(x) ((pgd_t) { (x) } )
54 #define __pgprot(x) ((pgprot_t) { (x) } )
55
56 #endif /* !__ASSEMBLY__ */
57
58 /* to align the pointer to the (next) page boundary */
59 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
60
61 /*
62 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
63 *
64 * arch/sh/vmlinux.lds.S
65 *
66 * which has the same constant encoded..
67 */
68
69 #define __MEMORY_START CONFIG_MEMORY_START
70
71 #define PAGE_OFFSET (0x80000000UL)
72 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
73 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
74 #define virt_to_page(kaddr) (mem_map + ((__pa(kaddr)-__MEMORY_START) >> PAGE_SHIFT))
75 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
76
77 #ifndef __ASSEMBLY__
78
79 /*
80 * Tell the user there is some problem.
81 */
82 #define BUG() do { \
83 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
84 asm volatile("nop"); \
85 } while (0)
86
87 #define PAGE_BUG(page) do { \
88 BUG(); \
89 } while (0)
90
91 /* Pure 2^n version of get_order */
92 extern __inline__ int get_order(unsigned long size)
93 {
94 int order;
95
96 size = (size-1) >> (PAGE_SHIFT-1);
97 order = -1;
98 do {
99 size >>= 1;
100 order++;
101 } while (size);
102 return order;
103 }
104
105 #endif
106
107 #endif /* __KERNEL__ */
108
109 #endif /* __ASM_SH_PAGE_H */
110
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