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 #include <asm/asm.h>
14
15 #include <vdso/page.h>
16
17 #define PAGE_DEFAULT_ACC _AC(0, UL)
18 /* storage-protection override */
19 #define PAGE_SPO_ACC 9
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 #define HUGE_MAX_HSTATE 2
27
28 #define ARCH_HAS_SETCLEAR_HUGE_PTE
29 #define ARCH_HAS_HUGE_PTE_TYPE
30 #define ARCH_HAS_PREPARE_HUGEPAGE
31 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
32
33 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
34
35 #include <asm/setup.h>
36 #ifndef __ASSEMBLER__
37
38 void __storage_key_init_range(unsigned long start, unsigned long end);
39
storage_key_init_range(unsigned long start,unsigned long end)40 static inline void storage_key_init_range(unsigned long start, unsigned long end)
41 {
42 if (PAGE_DEFAULT_KEY != 0)
43 __storage_key_init_range(start, end);
44 }
45
46 #define clear_page(page) memset((page), 0, PAGE_SIZE)
47
48 /*
49 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
50 * bypass caches when copying a page. Especially when copying huge pages
51 * this keeps L1 and L2 data caches alive.
52 */
copy_page(void * to,void * from)53 static inline void copy_page(void *to, void *from)
54 {
55 union register_pair dst, src;
56
57 dst.even = (unsigned long) to;
58 dst.odd = 0x1000;
59 src.even = (unsigned long) from;
60 src.odd = 0xb0001000;
61
62 asm volatile(
63 " mvcl %[dst],%[src]"
64 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair)
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 vma_alloc_zeroed_movable_folio(vma, vaddr) \
72 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr)
73
74 #ifdef CONFIG_STRICT_MM_TYPECHECKS
75 #define STRICT_MM_TYPECHECKS
76 #endif
77
78 #ifdef STRICT_MM_TYPECHECKS
79
80 typedef struct { unsigned long pgprot; } pgprot_t;
81 typedef struct { unsigned long pgste; } pgste_t;
82 typedef struct { unsigned long pte; } pte_t;
83 typedef struct { unsigned long pmd; } pmd_t;
84 typedef struct { unsigned long pud; } pud_t;
85 typedef struct { unsigned long p4d; } p4d_t;
86 typedef struct { unsigned long pgd; } pgd_t;
87
88 #define DEFINE_PGVAL_FUNC(name) \
89 static __always_inline unsigned long name ## _val(name ## _t name) \
90 { \
91 return name.name; \
92 }
93
94 #else /* STRICT_MM_TYPECHECKS */
95
96 typedef unsigned long pgprot_t;
97 typedef unsigned long pgste_t;
98 typedef unsigned long pte_t;
99 typedef unsigned long pmd_t;
100 typedef unsigned long pud_t;
101 typedef unsigned long p4d_t;
102 typedef unsigned long pgd_t;
103
104 #define DEFINE_PGVAL_FUNC(name) \
105 static __always_inline unsigned long name ## _val(name ## _t name) \
106 { \
107 return name; \
108 }
109
110 #endif /* STRICT_MM_TYPECHECKS */
111
112 DEFINE_PGVAL_FUNC(pgprot)
113 DEFINE_PGVAL_FUNC(pgste)
114 DEFINE_PGVAL_FUNC(pte)
115 DEFINE_PGVAL_FUNC(pmd)
116 DEFINE_PGVAL_FUNC(pud)
117 DEFINE_PGVAL_FUNC(p4d)
118 DEFINE_PGVAL_FUNC(pgd)
119
120 typedef pte_t *pgtable_t;
121
122 #define __pgprot(x) ((pgprot_t) { (x) } )
123 #define __pgste(x) ((pgste_t) { (x) } )
124 #define __pte(x) ((pte_t) { (x) } )
125 #define __pmd(x) ((pmd_t) { (x) } )
126 #define __pud(x) ((pud_t) { (x) } )
127 #define __p4d(x) ((p4d_t) { (x) } )
128 #define __pgd(x) ((pgd_t) { (x) } )
129
page_set_storage_key(unsigned long addr,unsigned char skey,int mapped)130 static inline void page_set_storage_key(unsigned long addr,
131 unsigned char skey, int mapped)
132 {
133 if (!mapped) {
134 asm volatile(
135 " .insn rrf,0xb22b0000,%[skey],%[addr],8,0"
136 :
137 : [skey] "d" (skey), [addr] "a" (addr)
138 : "memory");
139 } else {
140 asm volatile(
141 " sske %[skey],%[addr]"
142 :
143 : [skey] "d" (skey), [addr] "a" (addr)
144 : "memory");
145 }
146 }
147
page_get_storage_key(unsigned long addr)148 static inline unsigned char page_get_storage_key(unsigned long addr)
149 {
150 unsigned char skey;
151
152 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
153 return skey;
154 }
155
page_reset_referenced(unsigned long addr)156 static inline int page_reset_referenced(unsigned long addr)
157 {
158 int cc;
159
160 asm volatile(
161 " rrbe 0,%[addr]\n"
162 CC_IPM(cc)
163 : CC_OUT(cc, cc)
164 : [addr] "a" (addr)
165 : CC_CLOBBER);
166 return CC_TRANSFORM(cc);
167 }
168
169 /* Bits int the storage key */
170 #define _PAGE_CHANGED 0x02 /* HW changed bit */
171 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
172 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
173 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
174
175 struct page;
176 struct folio;
177 void arch_free_page(struct page *page, int order);
178 void arch_alloc_page(struct page *page, int order);
179
devmem_is_allowed(unsigned long pfn)180 static inline int devmem_is_allowed(unsigned long pfn)
181 {
182 return 0;
183 }
184
185 #define HAVE_ARCH_FREE_PAGE
186 #define HAVE_ARCH_ALLOC_PAGE
187
188 int arch_make_folio_accessible(struct folio *folio);
189 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
190
191 struct vm_layout {
192 unsigned long kaslr_offset;
193 unsigned long kaslr_offset_phys;
194 unsigned long identity_base;
195 unsigned long identity_size;
196 };
197
198 extern struct vm_layout vm_layout;
199
200 #define __kaslr_offset vm_layout.kaslr_offset
201 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys
202 #ifdef CONFIG_RANDOMIZE_IDENTITY_BASE
203 #define __identity_base vm_layout.identity_base
204 #else
205 #define __identity_base 0UL
206 #endif
207 #define ident_map_size vm_layout.identity_size
208
kaslr_offset(void)209 static inline unsigned long kaslr_offset(void)
210 {
211 return __kaslr_offset;
212 }
213
214 extern int __kaslr_enabled;
kaslr_enabled(void)215 static inline int kaslr_enabled(void)
216 {
217 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
218 return __kaslr_enabled;
219 return 0;
220 }
221
222 #define __PAGE_OFFSET __identity_base
223 #define PAGE_OFFSET __PAGE_OFFSET
224
225 #ifdef __DECOMPRESSOR
226
227 #define __pa_nodebug(x) ((unsigned long)(x))
228 #define __pa(x) __pa_nodebug(x)
229 #define __pa32(x) __pa(x)
230 #define __va(x) ((void *)(unsigned long)(x))
231
232 #else /* __DECOMPRESSOR */
233
__pa_nodebug(unsigned long x)234 static inline unsigned long __pa_nodebug(unsigned long x)
235 {
236 if (x < __kaslr_offset)
237 return x - __identity_base;
238 return x - __kaslr_offset + __kaslr_offset_phys;
239 }
240
241 #ifdef CONFIG_DEBUG_VIRTUAL
242
243 unsigned long __phys_addr(unsigned long x, bool is_31bit);
244
245 #else /* CONFIG_DEBUG_VIRTUAL */
246
__phys_addr(unsigned long x,bool is_31bit)247 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
248 {
249 return __pa_nodebug(x);
250 }
251
252 #endif /* CONFIG_DEBUG_VIRTUAL */
253
254 #define __pa(x) __phys_addr((unsigned long)(x), false)
255 #define __pa32(x) __phys_addr((unsigned long)(x), true)
256 #define __va(x) ((void *)((unsigned long)(x) + __identity_base))
257
258 #endif /* __DECOMPRESSOR */
259
260 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
261 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
262
263 #define phys_to_folio(phys) page_folio(phys_to_page(phys))
264 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio))
265
pfn_to_virt(unsigned long pfn)266 static inline void *pfn_to_virt(unsigned long pfn)
267 {
268 return __va(pfn_to_phys(pfn));
269 }
270
virt_to_pfn(const void * kaddr)271 static inline unsigned long virt_to_pfn(const void *kaddr)
272 {
273 return phys_to_pfn(__pa(kaddr));
274 }
275
276 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
277
278 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
279 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
280
281 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
282
283 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
284
285 #endif /* !__ASSEMBLER__ */
286
287 #include <asm-generic/memory_model.h>
288 #include <asm-generic/getorder.h>
289
290 #define AMODE31_SIZE (3 * PAGE_SIZE)
291
292 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
293 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE
294 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
295
296 #define TEXT_OFFSET 0x100000
297
298 #endif /* _S390_PAGE_H */
299