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 copy_user_page(to, from, vaddr, pg) copy_page(to, from)
69
70 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \
71 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr)
72
73 #ifdef CONFIG_STRICT_MM_TYPECHECKS
74 #define STRICT_MM_TYPECHECKS
75 #endif
76
77 #ifdef STRICT_MM_TYPECHECKS
78
79 typedef struct { unsigned long pgprot; } pgprot_t;
80 typedef struct { unsigned long pte; } pte_t;
81 typedef struct { unsigned long pmd; } pmd_t;
82 typedef struct { unsigned long pud; } pud_t;
83 typedef struct { unsigned long p4d; } p4d_t;
84 typedef struct { unsigned long pgd; } pgd_t;
85
86 #define DEFINE_PGVAL_FUNC(name) \
87 static __always_inline unsigned long name ## _val(name ## _t name) \
88 { \
89 return name.name; \
90 }
91
92 #else /* STRICT_MM_TYPECHECKS */
93
94 typedef unsigned long pgprot_t;
95 typedef unsigned long pte_t;
96 typedef unsigned long pmd_t;
97 typedef unsigned long pud_t;
98 typedef unsigned long p4d_t;
99 typedef unsigned long pgd_t;
100
101 #define DEFINE_PGVAL_FUNC(name) \
102 static __always_inline unsigned long name ## _val(name ## _t name) \
103 { \
104 return name; \
105 }
106
107 #endif /* STRICT_MM_TYPECHECKS */
108
109 DEFINE_PGVAL_FUNC(pgprot)
110 DEFINE_PGVAL_FUNC(pte)
111 DEFINE_PGVAL_FUNC(pmd)
112 DEFINE_PGVAL_FUNC(pud)
113 DEFINE_PGVAL_FUNC(p4d)
114 DEFINE_PGVAL_FUNC(pgd)
115
116 typedef pte_t *pgtable_t;
117
118 #define __pgprot(x) ((pgprot_t) { (x) } )
119 #define __pte(x) ((pte_t) { (x) } )
120 #define __pmd(x) ((pmd_t) { (x) } )
121 #define __pud(x) ((pud_t) { (x) } )
122 #define __p4d(x) ((p4d_t) { (x) } )
123 #define __pgd(x) ((pgd_t) { (x) } )
124
page_set_storage_key(unsigned long addr,unsigned char skey,int mapped)125 static inline void page_set_storage_key(unsigned long addr,
126 unsigned char skey, int mapped)
127 {
128 if (!mapped) {
129 asm volatile(
130 " .insn rrf,0xb22b0000,%[skey],%[addr],8,0"
131 :
132 : [skey] "d" (skey), [addr] "a" (addr)
133 : "memory");
134 } else {
135 asm volatile(
136 " sske %[skey],%[addr]"
137 :
138 : [skey] "d" (skey), [addr] "a" (addr)
139 : "memory");
140 }
141 }
142
page_get_storage_key(unsigned long addr)143 static inline unsigned char page_get_storage_key(unsigned long addr)
144 {
145 unsigned char skey;
146
147 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
148 return skey;
149 }
150
page_reset_referenced(unsigned long addr)151 static inline int page_reset_referenced(unsigned long addr)
152 {
153 int cc;
154
155 asm volatile(
156 " rrbe 0,%[addr]\n"
157 CC_IPM(cc)
158 : CC_OUT(cc, cc)
159 : [addr] "a" (addr)
160 : CC_CLOBBER);
161 return CC_TRANSFORM(cc);
162 }
163
164 int split_pud_page(pud_t *pudp, unsigned long addr);
165
166 /* Bits int the storage key */
167 #define _PAGE_CHANGED 0x02 /* HW changed bit */
168 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
169 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
170 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
171
172 struct page;
173 struct folio;
174 void arch_free_page(struct page *page, int order);
175 void arch_alloc_page(struct page *page, int order);
176
devmem_is_allowed(unsigned long pfn)177 static inline int devmem_is_allowed(unsigned long pfn)
178 {
179 return 0;
180 }
181
182 #define HAVE_ARCH_FREE_PAGE
183 #define HAVE_ARCH_ALLOC_PAGE
184
185 int arch_make_folio_accessible(struct folio *folio);
186 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
187
188 struct vm_layout {
189 unsigned long kaslr_offset;
190 unsigned long kaslr_offset_phys;
191 unsigned long identity_base;
192 unsigned long identity_size;
193 };
194
195 extern struct vm_layout vm_layout;
196
197 #define __kaslr_offset vm_layout.kaslr_offset
198 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys
199 #ifdef CONFIG_RANDOMIZE_IDENTITY_BASE
200 #define __identity_base vm_layout.identity_base
201 #else
202 #define __identity_base 0UL
203 #endif
204 #define ident_map_size vm_layout.identity_size
205
kaslr_offset(void)206 static inline unsigned long kaslr_offset(void)
207 {
208 return __kaslr_offset;
209 }
210
211 extern int __kaslr_enabled;
kaslr_enabled(void)212 static inline int kaslr_enabled(void)
213 {
214 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
215 return __kaslr_enabled;
216 return 0;
217 }
218
219 #define __PAGE_OFFSET __identity_base
220 #define PAGE_OFFSET __PAGE_OFFSET
221
222 #ifdef __DECOMPRESSOR
223
224 #define __pa_nodebug(x) ((unsigned long)(x))
225 #define __pa(x) __pa_nodebug(x)
226 #define __pa32(x) __pa(x)
227 #define __va(x) ((void *)(unsigned long)(x))
228
229 #else /* __DECOMPRESSOR */
230
__pa_nodebug(unsigned long x)231 static inline unsigned long __pa_nodebug(unsigned long x)
232 {
233 if (x < __kaslr_offset)
234 return x - __identity_base;
235 return x - __kaslr_offset + __kaslr_offset_phys;
236 }
237
238 #ifdef CONFIG_DEBUG_VIRTUAL
239
240 unsigned long __phys_addr(unsigned long x, bool is_31bit);
241
242 #else /* CONFIG_DEBUG_VIRTUAL */
243
__phys_addr(unsigned long x,bool is_31bit)244 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
245 {
246 return __pa_nodebug(x);
247 }
248
249 #endif /* CONFIG_DEBUG_VIRTUAL */
250
251 #define __pa(x) __phys_addr((unsigned long)(x), false)
252 #define __pa32(x) __phys_addr((unsigned long)(x), true)
253 #define __va(x) ((void *)((unsigned long)(x) + __identity_base))
254
255 #endif /* __DECOMPRESSOR */
256
257 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
258 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
259
260 #define phys_to_folio(phys) page_folio(phys_to_page(phys))
261 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio))
262
pfn_to_virt(unsigned long pfn)263 static inline void *pfn_to_virt(unsigned long pfn)
264 {
265 return __va(pfn_to_phys(pfn));
266 }
267
virt_to_pfn(const void * kaddr)268 static inline unsigned long virt_to_pfn(const void *kaddr)
269 {
270 return phys_to_pfn(__pa(kaddr));
271 }
272
273 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
274
275 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
276 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
277
278 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
279
280 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
281
282 #endif /* !__ASSEMBLER__ */
283
284 #include <asm-generic/memory_model.h>
285 #include <asm-generic/getorder.h>
286
287 #define AMODE31_SIZE (3 * PAGE_SIZE)
288
289 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
290 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE
291 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
292
293 #define TEXT_OFFSET 0x100000
294
295 #endif /* _S390_PAGE_H */
296