1 #ifndef _PPC_PAGE_H
2 #define _PPC_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 #include <linux/config.h>
11
12 #define PAGE_OFFSET 0xc0000000
13 #define KERNELBASE PAGE_OFFSET
14
15 #ifndef __ASSEMBLY__
16 #include <asm/system.h> /* for xmon definition */
17
18 #ifdef CONFIG_XMON
19 #define BUG() do { \
20 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
21 xmon(0); \
22 } while (0)
23 #else
24 #define BUG() do { \
25 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
26 __asm__ __volatile__(".long 0x0"); \
27 } while (0)
28 #endif
29 #define PAGE_BUG(page) do { BUG(); } while (0)
30
31 #define STRICT_MM_TYPECHECKS
32
33 #ifdef STRICT_MM_TYPECHECKS
34 /*
35 * These are used to make use of C type-checking..
36 */
37 typedef struct { unsigned long pte; } pte_t;
38 typedef struct { unsigned long pmd; } pmd_t;
39 typedef struct { unsigned long pgd; } pgd_t;
40 typedef struct { unsigned long pgprot; } pgprot_t;
41
42 #define pte_val(x) ((x).pte)
43 #define pmd_val(x) ((x).pmd)
44 #define pgd_val(x) ((x).pgd)
45 #define pgprot_val(x) ((x).pgprot)
46
47 #define __pte(x) ((pte_t) { (x) } )
48 #define __pmd(x) ((pmd_t) { (x) } )
49 #define __pgd(x) ((pgd_t) { (x) } )
50 #define __pgprot(x) ((pgprot_t) { (x) } )
51
52 #else
53 /*
54 * .. while these make it easier on the compiler
55 */
56 typedef unsigned long pte_t;
57 typedef unsigned long pmd_t;
58 typedef unsigned long pgd_t;
59 typedef unsigned long pgprot_t;
60
61 #define pte_val(x) (x)
62 #define pmd_val(x) (x)
63 #define pgd_val(x) (x)
64 #define pgprot_val(x) (x)
65
66 #define __pte(x) (x)
67 #define __pmd(x) (x)
68 #define __pgd(x) (x)
69 #define __pgprot(x) (x)
70
71 #endif
72
73
74 /* align addr on a size boundry - adjust address up if needed -- Cort */
75 #define _ALIGN(addr,size) (((addr)+size-1)&(~(size-1)))
76
77 /* to align the pointer to the (next) page boundary */
78 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
79
80 extern void clear_page(void *page);
81 extern void copy_page(void *to, void *from);
82 #define clear_user_page(page, vaddr) clear_page(page)
83 #define copy_user_page(to, from, vaddr) copy_page(to, from)
84
85 /* map phys->virtual and virtual->phys for RAM pages */
86 static inline unsigned long ___pa(unsigned long v)
87 {
88 unsigned long p;
89 asm volatile ("1: addis %0, %1, %2;"
90 ".section \".vtop_fixup\",\"aw\";"
91 ".align 1;"
92 ".long 1b;"
93 ".previous;"
94 : "=r" (p)
95 : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
96
97 return p;
98 }
99 static inline void* ___va(unsigned long p)
100 {
101 unsigned long v;
102 asm volatile ("1: addis %0, %1, %2;"
103 ".section \".ptov_fixup\",\"aw\";"
104 ".align 1;"
105 ".long 1b;"
106 ".previous;"
107 : "=r" (v)
108 : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
109
110 return (void*) v;
111 }
112 #define __pa(x) ___pa ((unsigned long)(x))
113 #define __va(x) ___va ((unsigned long)(x))
114
115 #define MAP_PAGE_RESERVED (1<<15)
116 #define virt_to_page(kaddr) (mem_map + (((unsigned long)kaddr-PAGE_OFFSET) >> PAGE_SHIFT))
117 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
118
119 extern unsigned long get_zero_page_fast(void);
120
121 /* Pure 2^n version of get_order */
122 extern __inline__ int get_order(unsigned long size)
123 {
124 int order;
125
126 size = (size-1) >> (PAGE_SHIFT-1);
127 order = -1;
128 do {
129 size >>= 1;
130 order++;
131 } while (size);
132 return order;
133 }
134
135 #endif /* __ASSEMBLY__ */
136 #endif /* __KERNEL__ */
137 #endif /* _PPC_PAGE_H */
138
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