fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-s390 / page.h
blobceec3826a67c03729d090d7251fc93db677f8d45
1 /*
2 * include/asm-s390/page.h
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 */
9 #ifndef _S390_PAGE_H
10 #define _S390_PAGE_H
12 #include <linux/const.h>
13 #include <asm/types.h>
15 /* PAGE_SHIFT determines the page size */
16 #define PAGE_SHIFT 12
17 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
18 #define PAGE_MASK (~(PAGE_SIZE-1))
19 #define PAGE_DEFAULT_ACC 0
20 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
22 #ifdef __KERNEL__
23 #include <asm/setup.h>
24 #ifndef __ASSEMBLY__
26 static inline void clear_page(void *page)
28 register unsigned long reg1 asm ("1") = 0;
29 register void *reg2 asm ("2") = page;
30 register unsigned long reg3 asm ("3") = 4096;
31 asm volatile(
32 " mvcl 2,0"
33 : "+d" (reg2), "+d" (reg3) : "d" (reg1) : "memory", "cc");
36 static inline void copy_page(void *to, void *from)
38 if (MACHINE_HAS_MVPG) {
39 register unsigned long reg0 asm ("0") = 0;
40 asm volatile(
41 " mvpg %0,%1"
42 : : "a" (to), "a" (from), "d" (reg0)
43 : "memory", "cc");
44 } else
45 asm volatile(
46 " mvc 0(256,%0),0(%1)\n"
47 " mvc 256(256,%0),256(%1)\n"
48 " mvc 512(256,%0),512(%1)\n"
49 " mvc 768(256,%0),768(%1)\n"
50 " mvc 1024(256,%0),1024(%1)\n"
51 " mvc 1280(256,%0),1280(%1)\n"
52 " mvc 1536(256,%0),1536(%1)\n"
53 " mvc 1792(256,%0),1792(%1)\n"
54 " mvc 2048(256,%0),2048(%1)\n"
55 " mvc 2304(256,%0),2304(%1)\n"
56 " mvc 2560(256,%0),2560(%1)\n"
57 " mvc 2816(256,%0),2816(%1)\n"
58 " mvc 3072(256,%0),3072(%1)\n"
59 " mvc 3328(256,%0),3328(%1)\n"
60 " mvc 3584(256,%0),3584(%1)\n"
61 " mvc 3840(256,%0),3840(%1)\n"
62 : : "a" (to), "a" (from) : "memory");
65 #define clear_user_page(page, vaddr, pg) clear_page(page)
66 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
68 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
69 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
70 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
73 * These are used to make use of C type-checking..
76 typedef struct { unsigned long pgprot; } pgprot_t;
77 typedef struct { unsigned long pte; } pte_t;
79 #define pte_val(x) ((x).pte)
80 #define pgprot_val(x) ((x).pgprot)
82 #ifndef __s390x__
84 typedef struct { unsigned long pmd; } pmd_t;
85 typedef struct {
86 unsigned long pgd0;
87 unsigned long pgd1;
88 unsigned long pgd2;
89 unsigned long pgd3;
90 } pgd_t;
92 #define pmd_val(x) ((x).pmd)
93 #define pgd_val(x) ((x).pgd0)
95 #else /* __s390x__ */
97 typedef struct {
98 unsigned long pmd0;
99 unsigned long pmd1;
100 } pmd_t;
101 typedef struct { unsigned long pgd; } pgd_t;
103 #define pmd_val(x) ((x).pmd0)
104 #define pmd_val1(x) ((x).pmd1)
105 #define pgd_val(x) ((x).pgd)
107 #endif /* __s390x__ */
109 #define __pte(x) ((pte_t) { (x) } )
110 #define __pmd(x) ((pmd_t) { (x) } )
111 #define __pgd(x) ((pgd_t) { (x) } )
112 #define __pgprot(x) ((pgprot_t) { (x) } )
114 /* default storage key used for all pages */
115 extern unsigned int default_storage_key;
117 static inline void
118 page_set_storage_key(unsigned long addr, unsigned int skey)
120 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
123 static inline unsigned int
124 page_get_storage_key(unsigned long addr)
126 unsigned int skey;
128 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0));
129 return skey;
132 extern unsigned long max_pfn;
134 static inline int pfn_valid(unsigned long pfn)
136 unsigned long dummy;
137 int ccode;
139 if (pfn >= max_pfn)
140 return 0;
142 asm volatile(
143 " lra %0,0(%2)\n"
144 " ipm %1\n"
145 " srl %1,28\n"
146 : "=d" (dummy), "=d" (ccode)
147 : "a" (pfn << PAGE_SHIFT)
148 : "cc");
149 return !ccode;
152 #endif /* !__ASSEMBLY__ */
154 /* to align the pointer to the (next) page boundary */
155 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
157 #define __PAGE_OFFSET 0x0UL
158 #define PAGE_OFFSET 0x0UL
159 #define __pa(x) (unsigned long)(x)
160 #define __va(x) (void *)(unsigned long)(x)
161 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
162 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
163 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
165 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
166 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
168 #include <asm-generic/memory_model.h>
169 #include <asm-generic/page.h>
171 #endif /* __KERNEL__ */
173 #endif /* _S390_PAGE_H */