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 __ASSEMBLY__
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 /*
75 * These are used to make use of C type-checking..
76 */
77
78 typedef struct { unsigned long pgprot; } pgprot_t;
79 typedef struct { unsigned long pgste; } pgste_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 typedef pte_t *pgtable_t;
86
87 #define pgprot_val(x) ((x).pgprot)
88 #define pgste_val(x) ((x).pgste)
89
pte_val(pte_t pte)90 static inline unsigned long pte_val(pte_t pte)
91 {
92 return pte.pte;
93 }
94
pmd_val(pmd_t pmd)95 static inline unsigned long pmd_val(pmd_t pmd)
96 {
97 return pmd.pmd;
98 }
99
pud_val(pud_t pud)100 static inline unsigned long pud_val(pud_t pud)
101 {
102 return pud.pud;
103 }
104
p4d_val(p4d_t p4d)105 static inline unsigned long p4d_val(p4d_t p4d)
106 {
107 return p4d.p4d;
108 }
109
pgd_val(pgd_t pgd)110 static inline unsigned long pgd_val(pgd_t pgd)
111 {
112 return pgd.pgd;
113 }
114
115 #define __pgste(x) ((pgste_t) { (x) } )
116 #define __pte(x) ((pte_t) { (x) } )
117 #define __pmd(x) ((pmd_t) { (x) } )
118 #define __pud(x) ((pud_t) { (x) } )
119 #define __p4d(x) ((p4d_t) { (x) } )
120 #define __pgd(x) ((pgd_t) { (x) } )
121 #define __pgprot(x) ((pgprot_t) { (x) } )
122
page_set_storage_key(unsigned long addr,unsigned char skey,int mapped)123 static inline void page_set_storage_key(unsigned long addr,
124 unsigned char skey, int mapped)
125 {
126 if (!mapped)
127 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
128 : : "d" (skey), "a" (addr));
129 else
130 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
131 }
132
page_get_storage_key(unsigned long addr)133 static inline unsigned char page_get_storage_key(unsigned long addr)
134 {
135 unsigned char skey;
136
137 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
138 return skey;
139 }
140
page_reset_referenced(unsigned long addr)141 static inline int page_reset_referenced(unsigned long addr)
142 {
143 int cc;
144
145 asm volatile(
146 " rrbe 0,%[addr]\n"
147 CC_IPM(cc)
148 : CC_OUT(cc, cc)
149 : [addr] "a" (addr)
150 : CC_CLOBBER);
151 return CC_TRANSFORM(cc);
152 }
153
154 /* Bits int the storage key */
155 #define _PAGE_CHANGED 0x02 /* HW changed bit */
156 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
157 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
158 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
159
160 struct page;
161 struct folio;
162 void arch_free_page(struct page *page, int order);
163 void arch_alloc_page(struct page *page, int order);
164
devmem_is_allowed(unsigned long pfn)165 static inline int devmem_is_allowed(unsigned long pfn)
166 {
167 return 0;
168 }
169
170 #define HAVE_ARCH_FREE_PAGE
171 #define HAVE_ARCH_ALLOC_PAGE
172
173 int arch_make_folio_accessible(struct folio *folio);
174 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
175
176 struct vm_layout {
177 unsigned long kaslr_offset;
178 unsigned long kaslr_offset_phys;
179 unsigned long identity_base;
180 unsigned long identity_size;
181 };
182
183 extern struct vm_layout vm_layout;
184
185 #define __kaslr_offset vm_layout.kaslr_offset
186 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys
187 #ifdef CONFIG_RANDOMIZE_IDENTITY_BASE
188 #define __identity_base vm_layout.identity_base
189 #else
190 #define __identity_base 0UL
191 #endif
192 #define ident_map_size vm_layout.identity_size
193
kaslr_offset(void)194 static inline unsigned long kaslr_offset(void)
195 {
196 return __kaslr_offset;
197 }
198
199 extern int __kaslr_enabled;
kaslr_enabled(void)200 static inline int kaslr_enabled(void)
201 {
202 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
203 return __kaslr_enabled;
204 return 0;
205 }
206
207 #define __PAGE_OFFSET __identity_base
208 #define PAGE_OFFSET __PAGE_OFFSET
209
210 #ifdef __DECOMPRESSOR
211
212 #define __pa_nodebug(x) ((unsigned long)(x))
213 #define __pa(x) __pa_nodebug(x)
214 #define __pa32(x) __pa(x)
215 #define __va(x) ((void *)(unsigned long)(x))
216
217 #else /* __DECOMPRESSOR */
218
__pa_nodebug(unsigned long x)219 static inline unsigned long __pa_nodebug(unsigned long x)
220 {
221 if (x < __kaslr_offset)
222 return x - __identity_base;
223 return x - __kaslr_offset + __kaslr_offset_phys;
224 }
225
226 #ifdef CONFIG_DEBUG_VIRTUAL
227
228 unsigned long __phys_addr(unsigned long x, bool is_31bit);
229
230 #else /* CONFIG_DEBUG_VIRTUAL */
231
__phys_addr(unsigned long x,bool is_31bit)232 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
233 {
234 return __pa_nodebug(x);
235 }
236
237 #endif /* CONFIG_DEBUG_VIRTUAL */
238
239 #define __pa(x) __phys_addr((unsigned long)(x), false)
240 #define __pa32(x) __phys_addr((unsigned long)(x), true)
241 #define __va(x) ((void *)((unsigned long)(x) + __identity_base))
242
243 #endif /* __DECOMPRESSOR */
244
245 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
246 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
247
248 #define phys_to_folio(phys) page_folio(phys_to_page(phys))
249 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio))
250
pfn_to_virt(unsigned long pfn)251 static inline void *pfn_to_virt(unsigned long pfn)
252 {
253 return __va(pfn_to_phys(pfn));
254 }
255
virt_to_pfn(const void * kaddr)256 static inline unsigned long virt_to_pfn(const void *kaddr)
257 {
258 return phys_to_pfn(__pa(kaddr));
259 }
260
261 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
262
263 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
264 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
265
266 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
267
268 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
269
270 #endif /* !__ASSEMBLY__ */
271
272 #include <asm-generic/memory_model.h>
273 #include <asm-generic/getorder.h>
274
275 #define AMODE31_SIZE (3 * PAGE_SIZE)
276
277 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
278 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE
279 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
280
281 #define TEXT_OFFSET 0x100000
282
283 #endif /* _S390_PAGE_H */
284