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 CONFIG_PAGE_SHIFT
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 _AC(0, UL)
23 /* storage-protection override */
24 #define PAGE_SPO_ACC 9
25 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
26
27 #define HPAGE_SHIFT 20
28 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
29 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
30 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
31 #define HUGE_MAX_HSTATE 2
32
33 #define ARCH_HAS_SETCLEAR_HUGE_PTE
34 #define ARCH_HAS_HUGE_PTE_TYPE
35 #define ARCH_HAS_PREPARE_HUGEPAGE
36 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
37
38 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
39
40 #include <asm/setup.h>
41 #ifndef __ASSEMBLY__
42
43 void __storage_key_init_range(unsigned long start, unsigned long end);
44
45 static inline void storage_key_init_range(unsigned long start, unsigned long end)
46 {
47 if (PAGE_DEFAULT_KEY != 0)
48 __storage_key_init_range(start, end);
49 }
50
51 #define clear_page(page) memset((page), 0, PAGE_SIZE)
52
53 /*
54 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
55 * bypass caches when copying a page. Especially when copying huge pages
56 * this keeps L1 and L2 data caches alive.
57 */
58 static inline void copy_page(void *to, void *from)
59 {
60 union register_pair dst, src;
61
62 dst.even = (unsigned long) to;
63 dst.odd = 0x1000;
64 src.even = (unsigned long) from;
65 src.odd = 0xb0001000;
66
67 asm volatile(
68 " mvcl %[dst],%[src]"
69 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair)
70 : : "memory", "cc");
71 }
72
73 #define clear_user_page(page, vaddr, pg) clear_page(page)
74 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
75
76 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \
77 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false)
78
79 /*
80 * These are used to make use of C type-checking..
81 */
82
83 typedef struct { unsigned long pgprot; } pgprot_t;
84 typedef struct { unsigned long pgste; } pgste_t;
85 typedef struct { unsigned long pte; } pte_t;
86 typedef struct { unsigned long pmd; } pmd_t;
87 typedef struct { unsigned long pud; } pud_t;
88 typedef struct { unsigned long p4d; } p4d_t;
89 typedef struct { unsigned long pgd; } pgd_t;
90 typedef pte_t *pgtable_t;
91
92 #define pgprot_val(x) ((x).pgprot)
93 #define pgste_val(x) ((x).pgste)
94
95 static inline unsigned long pte_val(pte_t pte)
96 {
97 return pte.pte;
98 }
99
100 static inline unsigned long pmd_val(pmd_t pmd)
101 {
102 return pmd.pmd;
103 }
104
105 static inline unsigned long pud_val(pud_t pud)
106 {
107 return pud.pud;
108 }
109
110 static inline unsigned long p4d_val(p4d_t p4d)
111 {
112 return p4d.p4d;
113 }
114
115 static inline unsigned long pgd_val(pgd_t pgd)
116 {
117 return pgd.pgd;
118 }
119
120 #define __pgste(x) ((pgste_t) { (x) } )
121 #define __pte(x) ((pte_t) { (x) } )
122 #define __pmd(x) ((pmd_t) { (x) } )
123 #define __pud(x) ((pud_t) { (x) } )
124 #define __p4d(x) ((p4d_t) { (x) } )
125 #define __pgd(x) ((pgd_t) { (x) } )
126 #define __pgprot(x) ((pgprot_t) { (x) } )
127
128 static inline void page_set_storage_key(unsigned long addr,
129 unsigned char skey, int mapped)
130 {
131 if (!mapped)
132 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
133 : : "d" (skey), "a" (addr));
134 else
135 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
136 }
137
138 static inline unsigned char page_get_storage_key(unsigned long addr)
139 {
140 unsigned char skey;
141
142 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
143 return skey;
144 }
145
146 static inline int page_reset_referenced(unsigned long addr)
147 {
148 int cc;
149
150 asm volatile(
151 " rrbe 0,%1\n"
152 " ipm %0\n"
153 " srl %0,28\n"
154 : "=d" (cc) : "a" (addr) : "cc");
155 return cc;
156 }
157
158 /* Bits int the storage key */
159 #define _PAGE_CHANGED 0x02 /* HW changed bit */
160 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
161 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
162 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
163
164 struct page;
165 struct folio;
166 void arch_free_page(struct page *page, int order);
167 void arch_alloc_page(struct page *page, int order);
168
169 static inline int devmem_is_allowed(unsigned long pfn)
170 {
171 return 0;
172 }
173
174 #define HAVE_ARCH_FREE_PAGE
175 #define HAVE_ARCH_ALLOC_PAGE
176
177 int arch_make_folio_accessible(struct folio *folio);
178 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
179 int arch_make_page_accessible(struct page *page);
180 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
181
182 struct vm_layout {
183 unsigned long kaslr_offset;
184 unsigned long kaslr_offset_phys;
185 unsigned long identity_base;
186 unsigned long identity_size;
187 };
188
189 extern struct vm_layout vm_layout;
190
191 #define __kaslr_offset vm_layout.kaslr_offset
192 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys
193 #define __identity_base vm_layout.identity_base
194 #define ident_map_size vm_layout.identity_size
195
196 static inline unsigned long kaslr_offset(void)
197 {
198 return __kaslr_offset;
199 }
200
201 extern int __kaslr_enabled;
202 static inline int kaslr_enabled(void)
203 {
204 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
205 return __kaslr_enabled;
206 return 0;
207 }
208
209 #define __PAGE_OFFSET __identity_base
210 #define PAGE_OFFSET __PAGE_OFFSET
211
212 #ifdef __DECOMPRESSOR
213
214 #define __pa_nodebug(x) ((unsigned long)(x))
215 #define __pa(x) __pa_nodebug(x)
216 #define __pa32(x) __pa(x)
217 #define __va(x) ((void *)(unsigned long)(x))
218
219 #else /* __DECOMPRESSOR */
220
221 static inline unsigned long __pa_nodebug(unsigned long x)
222 {
223 if (x < __kaslr_offset)
224 return x - __identity_base;
225 return x - __kaslr_offset + __kaslr_offset_phys;
226 }
227
228 #ifdef CONFIG_DEBUG_VIRTUAL
229
230 unsigned long __phys_addr(unsigned long x, bool is_31bit);
231
232 #else /* CONFIG_DEBUG_VIRTUAL */
233
234 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
235 {
236 return __pa_nodebug(x);
237 }
238
239 #endif /* CONFIG_DEBUG_VIRTUAL */
240
241 #define __pa(x) __phys_addr((unsigned long)(x), false)
242 #define __pa32(x) __phys_addr((unsigned long)(x), true)
243 #define __va(x) ((void *)((unsigned long)(x) + __identity_base))
244
245 #endif /* __DECOMPRESSOR */
246
247 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
248 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
249
250 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
251 #define phys_to_folio(phys) page_folio(phys_to_page(phys))
252 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
253 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio))
254
255 static inline void *pfn_to_virt(unsigned long pfn)
256 {
257 return __va(pfn_to_phys(pfn));
258 }
259
260 static inline unsigned long virt_to_pfn(const void *kaddr)
261 {
262 return phys_to_pfn(__pa(kaddr));
263 }
264
265 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
266
267 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
268 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
269
270 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
271
272 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
273
274 #endif /* !__ASSEMBLY__ */
275
276 #include <asm-generic/memory_model.h>
277 #include <asm-generic/getorder.h>
278
279 #define AMODE31_SIZE (3 * PAGE_SIZE)
280
281 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
282 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE
283 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
284
285 #define TEXT_OFFSET 0x100000
286
287 #endif /* _S390_PAGE_H */
288
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