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 <linux/const.h>
13 #include <asm/types.h>
14
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)
21
22 #define HPAGE_SHIFT 20
23 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
24 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
25 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
26
27 #define ARCH_HAS_SETCLEAR_HUGE_PTE
28 #define ARCH_HAS_HUGE_PTE_TYPE
29 #define ARCH_HAS_PREPARE_HUGEPAGE
30 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
31
32 #include <asm/setup.h>
33 #ifndef __ASSEMBLY__
34
clear_page(void * page)35 static inline void clear_page(void *page)
36 {
37 if (MACHINE_HAS_PFMF) {
38 asm volatile(
39 " .insn rre,0xb9af0000,%0,%1"
40 : : "d" (0x10000), "a" (page) : "memory", "cc");
41 } else {
42 register unsigned long reg1 asm ("1") = 0;
43 register void *reg2 asm ("2") = page;
44 register unsigned long reg3 asm ("3") = 4096;
45 asm volatile(
46 " mvcl 2,0"
47 : "+d" (reg2), "+d" (reg3) : "d" (reg1)
48 : "memory", "cc");
49 }
50 }
51
copy_page(void * to,void * from)52 static inline void copy_page(void *to, void *from)
53 {
54 if (MACHINE_HAS_MVPG) {
55 register unsigned long reg0 asm ("0") = 0;
56 asm volatile(
57 " mvpg %0,%1"
58 : : "a" (to), "a" (from), "d" (reg0)
59 : "memory", "cc");
60 } else
61 asm volatile(
62 " mvc 0(256,%0),0(%1)\n"
63 " mvc 256(256,%0),256(%1)\n"
64 " mvc 512(256,%0),512(%1)\n"
65 " mvc 768(256,%0),768(%1)\n"
66 " mvc 1024(256,%0),1024(%1)\n"
67 " mvc 1280(256,%0),1280(%1)\n"
68 " mvc 1536(256,%0),1536(%1)\n"
69 " mvc 1792(256,%0),1792(%1)\n"
70 " mvc 2048(256,%0),2048(%1)\n"
71 " mvc 2304(256,%0),2304(%1)\n"
72 " mvc 2560(256,%0),2560(%1)\n"
73 " mvc 2816(256,%0),2816(%1)\n"
74 " mvc 3072(256,%0),3072(%1)\n"
75 " mvc 3328(256,%0),3328(%1)\n"
76 " mvc 3584(256,%0),3584(%1)\n"
77 " mvc 3840(256,%0),3840(%1)\n"
78 : : "a" (to), "a" (from) : "memory");
79 }
80
81 #define clear_user_page(page, vaddr, pg) clear_page(page)
82 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
83
84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
85 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
86 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
87
88 /*
89 * These are used to make use of C type-checking..
90 */
91
92 typedef struct { unsigned long pgprot; } pgprot_t;
93 typedef struct { unsigned long pgste; } pgste_t;
94 typedef struct { unsigned long pte; } pte_t;
95 typedef struct { unsigned long pmd; } pmd_t;
96 typedef struct { unsigned long pud; } pud_t;
97 typedef struct { unsigned long pgd; } pgd_t;
98 typedef pte_t *pgtable_t;
99
100 #define pgprot_val(x) ((x).pgprot)
101 #define pgste_val(x) ((x).pgste)
102 #define pte_val(x) ((x).pte)
103 #define pmd_val(x) ((x).pmd)
104 #define pud_val(x) ((x).pud)
105 #define pgd_val(x) ((x).pgd)
106
107 #define __pgste(x) ((pgste_t) { (x) } )
108 #define __pte(x) ((pte_t) { (x) } )
109 #define __pmd(x) ((pmd_t) { (x) } )
110 #define __pud(x) ((pud_t) { (x) } )
111 #define __pgd(x) ((pgd_t) { (x) } )
112 #define __pgprot(x) ((pgprot_t) { (x) } )
113
page_set_storage_key(unsigned long addr,unsigned char skey,int mapped)114 static inline void page_set_storage_key(unsigned long addr,
115 unsigned char skey, int mapped)
116 {
117 if (!mapped)
118 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
119 : : "d" (skey), "a" (addr));
120 else
121 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
122 }
123
page_get_storage_key(unsigned long addr)124 static inline unsigned char page_get_storage_key(unsigned long addr)
125 {
126 unsigned char skey;
127
128 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
129 return skey;
130 }
131
page_reset_referenced(unsigned long addr)132 static inline int page_reset_referenced(unsigned long addr)
133 {
134 unsigned int ipm;
135
136 asm volatile(
137 " rrbe 0,%1\n"
138 " ipm %0\n"
139 : "=d" (ipm) : "a" (addr) : "cc");
140 return !!(ipm & 0x20000000);
141 }
142
143 /* Bits int the storage key */
144 #define _PAGE_CHANGED 0x02 /* HW changed bit */
145 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
146 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
147 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
148
149 /*
150 * Test and clear dirty bit in storage key.
151 * We can't clear the changed bit atomically. This is a potential
152 * race against modification of the referenced bit. This function
153 * should therefore only be called if it is not mapped in any
154 * address space.
155 */
156 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
page_test_and_clear_dirty(unsigned long pfn,int mapped)157 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped)
158 {
159 unsigned char skey;
160
161 skey = page_get_storage_key(pfn << PAGE_SHIFT);
162 if (!(skey & _PAGE_CHANGED))
163 return 0;
164 page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped);
165 return 1;
166 }
167
168 /*
169 * Test and clear referenced bit in storage key.
170 */
171 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
page_test_and_clear_young(unsigned long pfn)172 static inline int page_test_and_clear_young(unsigned long pfn)
173 {
174 return page_reset_referenced(pfn << PAGE_SHIFT);
175 }
176
177 struct page;
178 void arch_free_page(struct page *page, int order);
179 void arch_alloc_page(struct page *page, int order);
180 void arch_set_page_states(int make_stable);
181
devmem_is_allowed(unsigned long pfn)182 static inline int devmem_is_allowed(unsigned long pfn)
183 {
184 return 0;
185 }
186
187 #define HAVE_ARCH_FREE_PAGE
188 #define HAVE_ARCH_ALLOC_PAGE
189
190 #endif /* !__ASSEMBLY__ */
191
192 #define __PAGE_OFFSET 0x0UL
193 #define PAGE_OFFSET 0x0UL
194 #define __pa(x) (unsigned long)(x)
195 #define __va(x) (void *)(unsigned long)(x)
196 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
197 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
198 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
199
200 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
201 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
202
203 #include <asm-generic/memory_model.h>
204 #include <asm-generic/getorder.h>
205
206 #define __HAVE_ARCH_GATE_AREA 1
207
208 #endif /* _S390_PAGE_H */
209