1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2000
5 * Author(s): Hartmut Penner (hp@de.ibm.com)
6 */
7
8 #ifndef _S390_PAGE_H
9 #define _S390_PAGE_H
10
11 #include <linux/const.h>
12 #include <asm/types.h>
13
14 #define _PAGE_SHIFT 12
15 #define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT)
16 #define _PAGE_MASK (~(_PAGE_SIZE - 1))
17
18 /* PAGE_SHIFT determines the page size */
19 #define PAGE_SHIFT _PAGE_SHIFT
20 #define PAGE_SIZE _PAGE_SIZE
21 #define PAGE_MASK _PAGE_MASK
22 #define PAGE_DEFAULT_ACC 0
23 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
24
25 #define HPAGE_SHIFT 20
26 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
27 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
28 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
29 #define HUGE_MAX_HSTATE 2
30
31 #define ARCH_HAS_SETCLEAR_HUGE_PTE
32 #define ARCH_HAS_HUGE_PTE_TYPE
33 #define ARCH_HAS_PREPARE_HUGEPAGE
34 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
35
36 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
37
38 #include <asm/setup.h>
39 #ifndef __ASSEMBLY__
40
41 void __storage_key_init_range(unsigned long start, unsigned long end);
42
storage_key_init_range(unsigned long start,unsigned long end)43 static inline void storage_key_init_range(unsigned long start, unsigned long end)
44 {
45 if (PAGE_DEFAULT_KEY != 0)
46 __storage_key_init_range(start, end);
47 }
48
49 #define clear_page(page) memset((page), 0, PAGE_SIZE)
50
51 /*
52 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
53 * bypass caches when copying a page. Especially when copying huge pages
54 * this keeps L1 and L2 data caches alive.
55 */
copy_page(void * to,void * from)56 static inline void copy_page(void *to, void *from)
57 {
58 register void *reg2 asm ("2") = to;
59 register unsigned long reg3 asm ("3") = 0x1000;
60 register void *reg4 asm ("4") = from;
61 register unsigned long reg5 asm ("5") = 0xb0001000;
62 asm volatile(
63 " mvcl 2,4"
64 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
65 : : "memory", "cc");
66 }
67
68 #define clear_user_page(page, vaddr, pg) clear_page(page)
69 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
70
71 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
72 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
73 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
74
75 /*
76 * These are used to make use of C type-checking..
77 */
78
79 typedef struct { unsigned long pgprot; } pgprot_t;
80 typedef struct { unsigned long pgste; } pgste_t;
81 typedef struct { unsigned long pte; } pte_t;
82 typedef struct { unsigned long pmd; } pmd_t;
83 typedef struct { unsigned long pud; } pud_t;
84 typedef struct { unsigned long p4d; } p4d_t;
85 typedef struct { unsigned long pgd; } pgd_t;
86 typedef pte_t *pgtable_t;
87
88 #define pgprot_val(x) ((x).pgprot)
89 #define pgste_val(x) ((x).pgste)
90 #define pte_val(x) ((x).pte)
91 #define pmd_val(x) ((x).pmd)
92 #define pud_val(x) ((x).pud)
93 #define p4d_val(x) ((x).p4d)
94 #define pgd_val(x) ((x).pgd)
95
96 #define __pgste(x) ((pgste_t) { (x) } )
97 #define __pte(x) ((pte_t) { (x) } )
98 #define __pmd(x) ((pmd_t) { (x) } )
99 #define __pud(x) ((pud_t) { (x) } )
100 #define __p4d(x) ((p4d_t) { (x) } )
101 #define __pgd(x) ((pgd_t) { (x) } )
102 #define __pgprot(x) ((pgprot_t) { (x) } )
103
page_set_storage_key(unsigned long addr,unsigned char skey,int mapped)104 static inline void page_set_storage_key(unsigned long addr,
105 unsigned char skey, int mapped)
106 {
107 if (!mapped)
108 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
109 : : "d" (skey), "a" (addr));
110 else
111 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
112 }
113
page_get_storage_key(unsigned long addr)114 static inline unsigned char page_get_storage_key(unsigned long addr)
115 {
116 unsigned char skey;
117
118 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
119 return skey;
120 }
121
page_reset_referenced(unsigned long addr)122 static inline int page_reset_referenced(unsigned long addr)
123 {
124 int cc;
125
126 asm volatile(
127 " rrbe 0,%1\n"
128 " ipm %0\n"
129 " srl %0,28\n"
130 : "=d" (cc) : "a" (addr) : "cc");
131 return cc;
132 }
133
134 /* Bits int the storage key */
135 #define _PAGE_CHANGED 0x02 /* HW changed bit */
136 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
137 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
138 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
139
140 struct page;
141 void arch_free_page(struct page *page, int order);
142 void arch_alloc_page(struct page *page, int order);
143 void arch_set_page_dat(struct page *page, int order);
144 void arch_set_page_nodat(struct page *page, int order);
145 int arch_test_page_nodat(struct page *page);
146 void arch_set_page_states(int make_stable);
147
devmem_is_allowed(unsigned long pfn)148 static inline int devmem_is_allowed(unsigned long pfn)
149 {
150 return 0;
151 }
152
153 #define HAVE_ARCH_FREE_PAGE
154 #define HAVE_ARCH_ALLOC_PAGE
155
156 #if IS_ENABLED(CONFIG_PGSTE)
157 int arch_make_page_accessible(struct page *page);
158 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
159 #endif
160
161 #endif /* !__ASSEMBLY__ */
162
163 #define __PAGE_OFFSET 0x0UL
164 #define PAGE_OFFSET 0x0UL
165
166 #define __pa(x) ((unsigned long)(x))
167 #define __va(x) ((void *)(unsigned long)(x))
168
169 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
170 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
171
172 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
173 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
174
175 #define pfn_to_virt(pfn) __va(pfn_to_phys(pfn))
176 #define virt_to_pfn(kaddr) (phys_to_pfn(__pa(kaddr)))
177 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
178
179 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
180 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
181
182 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
183
184 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
185
186 #include <asm-generic/memory_model.h>
187 #include <asm-generic/getorder.h>
188
189 #endif /* _S390_PAGE_H */
190
