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 #include <asm/setup.h>
13 #include <asm/types.h>
14
15 /* PAGE_SHIFT determines the page size */
16 #define PAGE_SHIFT 12
17 #define PAGE_SIZE (1UL << PAGE_SHIFT)
18 #define PAGE_MASK (~(PAGE_SIZE-1))
19
20 #ifdef __KERNEL__
21 #ifndef __ASSEMBLY__
22
clear_page(void * page)23 static inline void clear_page(void *page)
24 {
25 register_pair rp;
26
27 rp.subreg.even = (unsigned long) page;
28 rp.subreg.odd = (unsigned long) 4096;
29 asm volatile (" slr 1,1\n"
30 " mvcl %0,0"
31 : "+&a" (rp) : : "memory", "cc", "1" );
32 }
33
copy_page(void * to,void * from)34 static inline void copy_page(void *to, void *from)
35 {
36 if (MACHINE_HAS_MVPG)
37 asm volatile (" sr 0,0\n"
38 " mvpg %0,%1"
39 : : "a" ((void *)(to)), "a" ((void *)(from))
40 : "memory", "cc", "0" );
41 else
42 asm volatile (" mvc 0(256,%0),0(%1)\n"
43 " mvc 256(256,%0),256(%1)\n"
44 " mvc 512(256,%0),512(%1)\n"
45 " mvc 768(256,%0),768(%1)\n"
46 " mvc 1024(256,%0),1024(%1)\n"
47 " mvc 1280(256,%0),1280(%1)\n"
48 " mvc 1536(256,%0),1536(%1)\n"
49 " mvc 1792(256,%0),1792(%1)\n"
50 " mvc 2048(256,%0),2048(%1)\n"
51 " mvc 2304(256,%0),2304(%1)\n"
52 " mvc 2560(256,%0),2560(%1)\n"
53 " mvc 2816(256,%0),2816(%1)\n"
54 " mvc 3072(256,%0),3072(%1)\n"
55 " mvc 3328(256,%0),3328(%1)\n"
56 " mvc 3584(256,%0),3584(%1)\n"
57 " mvc 3840(256,%0),3840(%1)\n"
58 : : "a"((void *)(to)),"a"((void *)(from))
59 : "memory" );
60 }
61
62 #define clear_user_page(page, vaddr) clear_page(page)
63 #define copy_user_page(to, from, vaddr) copy_page(to, from)
64
65 #define BUG() do { \
66 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
67 __asm__ __volatile__(".long 0"); \
68 } while (0)
69
70 #define PAGE_BUG(page) do { \
71 BUG(); \
72 } while (0)
73
74 /* Pure 2^n version of get_order */
get_order(unsigned long size)75 extern __inline__ int get_order(unsigned long size)
76 {
77 int order;
78
79 size = (size-1) >> (PAGE_SHIFT-1);
80 order = -1;
81 do {
82 size >>= 1;
83 order++;
84 } while (size);
85 return order;
86 }
87
88 /*
89 * These are used to make use of C type-checking..
90 */
91 typedef struct { unsigned long pte; } pte_t;
92 typedef struct { unsigned long pmd; } pmd_t;
93 typedef struct {
94 unsigned long pgd0;
95 unsigned long pgd1;
96 unsigned long pgd2;
97 unsigned long pgd3;
98 } pgd_t;
99 typedef struct { unsigned long pgprot; } pgprot_t;
100
101 #define pte_val(x) ((x).pte)
102 #define pmd_val(x) ((x).pmd)
103 #define pgd_val(x) ((x).pgd0)
104 #define pgprot_val(x) ((x).pgprot)
105
106 #define __pte(x) ((pte_t) { (x) } )
107 #define __pmd(x) ((pmd_t) { (x) } )
108 #define __pgd(x) ((pgd_t) { (x) } )
109 #define __pgprot(x) ((pgprot_t) { (x) } )
110
111 #endif /* !__ASSEMBLY__ */
112
113 /* to align the pointer to the (next) page boundary */
114 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
115
116 #define __PAGE_OFFSET 0x0UL
117 #define PAGE_OFFSET 0x0UL
118 #define __pa(x) (unsigned long)(x)
119 #define __va(x) (void *)(x)
120 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
121 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
122
123 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
124 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
125
126 unsigned int get_storage_key(void);
127 unsigned long pfix_get_page_addr(void *);
128 unsigned long pfix_get_addr(void *);
129
130 #endif /* __KERNEL__ */
131
132 #endif /* _S390_PAGE_H */
133