1 /*
2 * include/asm-s390/page.h
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 */
8
9 #ifndef _S390_PAGE_H
10 #define _S390_PAGE_H
11
12 /* PAGE_SHIFT determines the page size */
13 #define PAGE_SHIFT 12
14 #define PAGE_SIZE (1UL << PAGE_SHIFT)
15 #define PAGE_MASK (~(PAGE_SIZE-1))
16
17 #ifdef __KERNEL__
18 #ifndef __ASSEMBLY__
19
20 #define STRICT_MM_TYPECHECKS
21
22 #define BUG() do { \
23 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
24 __asm__ __volatile__(".word 0x0000"); \
25 } while (0)
26
27 #define PAGE_BUG(page) do { \
28 BUG(); \
29 } while (0)
30
31 /* Pure 2^n version of get_order */
32 extern __inline__ int get_order(unsigned long size)
33 {
34 int order;
35
36 size = (size-1) >> (PAGE_SHIFT-1);
37 order = -1;
38 do {
39 size >>= 1;
40 order++;
41 } while (size);
42 return order;
43 }
44
45 /*
46 * gcc uses builtin, i.e. MVCLE for both operations
47 */
48
49 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
50 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
51
52 #ifdef STRICT_MM_TYPECHECKS
53 /*
54 * These are used to make use of C type-checking..
55 */
56 typedef struct { unsigned long pte; } pte_t;
57 typedef struct { unsigned long pmd; } pmd_t;
58 typedef struct {
59 unsigned long pgd0;
60 unsigned long pgd1;
61 unsigned long pgd2;
62 unsigned long pgd3;
63 } pgd_t;
64 typedef struct { unsigned long pgprot; } pgprot_t;
65
66 #define pte_val(x) ((x).pte)
67 #define pmd_val(x) ((x).pmd)
68 #define pgd_val(x) ((x).pgd0)
69 #define pgprot_val(x) ((x).pgprot)
70
71 #define __pte(x) ((pte_t) { (x) } )
72 #define __pmd(x) ((pmd_t) { (x) } )
73 #define __pgd(x) ((pgd_t) { (x) } )
74 #define __pgprot(x) ((pgprot_t) { (x) } )
75
76 #else
77 /*
78 * .. while these make it easier on the compiler
79 */
80 typedef unsigned long pte_t;
81 typedef unsigned long pmd_t;
82 typedef struct {
83 unsigned long pgd0;
84 unsigned long pgd1;
85 unsigned long pgd2;
86 unsigned long pgd3;
87 } pgd_t;
88 typedef unsigned long pgprot_t;
89
90 #define pte_val(x) (x)
91 #define pmd_val(x) (x)
92 #define pgd_val(x) (x)
93 #define pgprot_val(x) (x)
94
95 #define __pte(x) (x)
96 #define __pmd(x) (x)
97 #define __pgd(x) (x)
98 #define __pgprot(x) (x)
99
100 #endif
101 #endif /* !__ASSEMBLY__ */
102
103 /* to align the pointer to the (next) page boundary */
104 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
105
106 /*
107 *
108 *
109 */
110
111 #define __PAGE_OFFSET (0x0)
112 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
113 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
114 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
115 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
116 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
117
118 #endif /* __KERNEL__ */
119
120 #endif /* _S390_PAGE_H */
121
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