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 extern void clear_page(void *to);
28 extern void copy_page(void *to, void *from);
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 extern void __clear_user_page(void *to, void *orig_to);
37 extern void __copy_user_page(void *to, void *from, void *orig_to);
38 #endif
39
40 /*
41 * These are used to make use of C type-checking..
42 */
43 typedef struct { unsigned long pte; } pte_t;
44 typedef struct { unsigned long pmd; } pmd_t;
45 typedef struct { unsigned long pgd; } pgd_t;
46 typedef struct { unsigned long pgprot; } pgprot_t;
47
48 #define pte_val(x) ((x).pte)
49 #define pmd_val(x) ((x).pmd)
50 #define pgd_val(x) ((x).pgd)
51 #define pgprot_val(x) ((x).pgprot)
52
53 #define __pte(x) ((pte_t) { (x) } )
54 #define __pmd(x) ((pmd_t) { (x) } )
55 #define __pgd(x) ((pgd_t) { (x) } )
56 #define __pgprot(x) ((pgprot_t) { (x) } )
57
58 #endif /* !__ASSEMBLY__ */
59
60 /* to align the pointer to the (next) page boundary */
61 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
62
63 /*
64 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
65 *
66 * arch/sh/vmlinux.lds.S
67 *
68 * which has the same constant encoded..
69 */
70
71 #define __MEMORY_START CONFIG_MEMORY_START
72 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
73 #ifdef CONFIG_DISCONTIGMEM
74 /* Just for HP690, for now.. */
75 #define __MEMORY_START_2ND (__MEMORY_START+0x02000000)
76 #define __MEMORY_SIZE_2ND 0x001000000 /* 16MB */
77 #endif
78
79 #define PAGE_OFFSET (0x80000000UL)
80 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
81 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
82
83 #ifndef CONFIG_DISCONTIGMEM
84 #define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
85 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
86 #define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
87 #endif
88
89 #define virt_to_page(kaddr) phys_to_page(__pa(kaddr))
90
91 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
92 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
93
94 #ifndef __ASSEMBLY__
95
96 /*
97 * Tell the user there is some problem.
98 */
99 #define BUG() do { \
100 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
101 asm volatile("nop"); \
102 } while (0)
103
104 #define PAGE_BUG(page) do { \
105 BUG(); \
106 } while (0)
107
108 /* Pure 2^n version of get_order */
get_order(unsigned long size)109 static __inline__ int get_order(unsigned long size)
110 {
111 int order;
112
113 size = (size-1) >> (PAGE_SHIFT-1);
114 order = -1;
115 do {
116 size >>= 1;
117 order++;
118 } while (size);
119 return order;
120 }
121
122 #endif
123
124 #endif /* __KERNEL__ */
125
126 #endif /* __ASM_SH_PAGE_H */
127