1 /*
2 * include/asm-s390/page.h
3 *
4 * S390 version
5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hpenner@de.ibm.com)
7 */
8
9 #ifndef _S390_PAGE_H
10 #define _S390_PAGE_H
11
12 #include <asm/setup.h>
13
14 /* PAGE_SHIFT determines the page size */
15 #define PAGE_SHIFT 12
16 #define PAGE_SIZE (1UL << PAGE_SHIFT)
17 #define PAGE_MASK (~(PAGE_SIZE-1))
18
19 #ifdef __KERNEL__
20 #ifndef __ASSEMBLY__
21
clear_page(void * page)22 static inline void clear_page(void *page)
23 {
24 asm volatile (" lgr 2,%0\n"
25 " lghi 3,4096\n"
26 " slgr 1,1\n"
27 " mvcl 2,0"
28 : : "a" ((void *) (page))
29 : "memory", "cc", "1", "2", "3" );
30 }
31
copy_page(void * to,void * from)32 static inline void copy_page(void *to, void *from)
33 {
34 if (MACHINE_HAS_MVPG)
35 asm volatile (" sgr 0,0\n"
36 " mvpg %0,%1"
37 : : "a" ((void *)(to)), "a" ((void *)(from))
38 : "memory", "cc", "0" );
39 else
40 asm volatile (" mvc 0(256,%0),0(%1)\n"
41 " mvc 256(256,%0),256(%1)\n"
42 " mvc 512(256,%0),512(%1)\n"
43 " mvc 768(256,%0),768(%1)\n"
44 " mvc 1024(256,%0),1024(%1)\n"
45 " mvc 1280(256,%0),1280(%1)\n"
46 " mvc 1536(256,%0),1536(%1)\n"
47 " mvc 1792(256,%0),1792(%1)\n"
48 " mvc 2048(256,%0),2048(%1)\n"
49 " mvc 2304(256,%0),2304(%1)\n"
50 " mvc 2560(256,%0),2560(%1)\n"
51 " mvc 2816(256,%0),2816(%1)\n"
52 " mvc 3072(256,%0),3072(%1)\n"
53 " mvc 3328(256,%0),3328(%1)\n"
54 " mvc 3584(256,%0),3584(%1)\n"
55 " mvc 3840(256,%0),3840(%1)\n"
56 : : "a"((void *)(to)),"a"((void *)(from))
57 : "memory" );
58 }
59
60 #define clear_user_page(page, vaddr) clear_page(page)
61 #define copy_user_page(to, from, vaddr) copy_page(to, from)
62
63 #define BUG() do { \
64 printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
65 __asm__ __volatile__(".long 0"); \
66 } while (0)
67
68 #define PAGE_BUG(page) do { \
69 BUG(); \
70 } while (0)
71
72 /* Pure 2^n version of get_order */
get_order(unsigned long size)73 extern __inline__ int get_order(unsigned long size)
74 {
75 int order;
76
77 size = (size-1) >> (PAGE_SHIFT-1);
78 order = -1;
79 do {
80 size >>= 1;
81 order++;
82 } while (size);
83 return order;
84 }
85
86 /*
87 * These are used to make use of C type-checking..
88 */
89 typedef struct { unsigned long pte; } pte_t;
90 typedef struct {
91 unsigned long pmd0;
92 unsigned long pmd1;
93 } pmd_t;
94 typedef unsigned int pgd_t;
95 typedef struct { unsigned long pgprot; } pgprot_t;
96
97 #define pte_val(x) ((x).pte)
98 #define pmd_val(x) ((x).pmd0)
99 #define pmd_val1(x) ((x).pmd1)
100
__pgd_val(pgd_t * pgdp)101 static inline unsigned long __pgd_val(pgd_t *pgdp)
102 {
103 unsigned long addr = (unsigned long) pgdp;
104 unsigned long *pgd_slot = (unsigned long *) (addr & -8);
105
106 return *pgd_slot + ((addr & 4) << 11);
107 }
108 #define pgd_val(pgd) __pgd_val(&(pgd))
109
110 #define pgprot_val(x) ((x).pgprot)
111
112 #define __pte(x) ((pte_t) { (x) } )
113 #define __pmd(x) ((pmd_t) { (x) } )
114 #define __pgd(x) ((pgd_t) { (x) } )
115 #define __pgprot(x) ((pgprot_t) { (x) } )
116
117 #endif /* !__ASSEMBLY__ */
118
119 /* to align the pointer to the (next) page boundary */
120 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
121
122 #define __PAGE_OFFSET 0x0UL
123 #define PAGE_OFFSET 0x0UL
124 #define __pa(x) (unsigned long)(x)
125 #define __va(x) (void *)(x)
126 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
127 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
128
129 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
130 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
131
132 #define get_storage_key() 0
133 #define pfix_get_page_addr(addr) (unsigned long)addr
134 #define pfix_get_addr(addr) (unsigned long)addr
135
136 #endif /* __KERNEL__ */
137
138 #endif /* _S390_PAGE_H */
139