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1/*
2 * include/asm-s390/page.h
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
7 */
8
9#ifndef _S390_PAGE_H
10#define _S390_PAGE_H
11
12#include <linux/const.h>
13#include <asm/types.h>
14
15/* PAGE_SHIFT determines the page size */
16#define PAGE_SHIFT 12
17#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
18#define PAGE_MASK (~(PAGE_SIZE-1))
19#define PAGE_DEFAULT_ACC 0
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
27#define ARCH_HAS_SETCLEAR_HUGE_PTE
28#define ARCH_HAS_HUGE_PTE_TYPE
29#define ARCH_HAS_PREPARE_HUGEPAGE
30#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
31
32#include <asm/setup.h>
33#ifndef __ASSEMBLY__
34
35static inline void clear_page(void *page)
36{
37 if (MACHINE_HAS_PFMF) {
38 asm volatile(
39 " .insn rre,0xb9af0000,%0,%1"
40 : : "d" (0x10000), "a" (page) : "memory", "cc");
41 } else {
42 register unsigned long reg1 asm ("1") = 0;
43 register void *reg2 asm ("2") = page;
44 register unsigned long reg3 asm ("3") = 4096;
45 asm volatile(
46 " mvcl 2,0"
47 : "+d" (reg2), "+d" (reg3) : "d" (reg1)
48 : "memory", "cc");
49 }
50}
51
52static inline void copy_page(void *to, void *from)
53{
54 if (MACHINE_HAS_MVPG) {
55 register unsigned long reg0 asm ("0") = 0;
56 asm volatile(
57 " mvpg %0,%1"
58 : : "a" (to), "a" (from), "d" (reg0)
59 : "memory", "cc");
60 } else
61 asm volatile(
62 " mvc 0(256,%0),0(%1)\n"
63 " mvc 256(256,%0),256(%1)\n"
64 " mvc 512(256,%0),512(%1)\n"
65 " mvc 768(256,%0),768(%1)\n"
66 " mvc 1024(256,%0),1024(%1)\n"
67 " mvc 1280(256,%0),1280(%1)\n"
68 " mvc 1536(256,%0),1536(%1)\n"
69 " mvc 1792(256,%0),1792(%1)\n"
70 " mvc 2048(256,%0),2048(%1)\n"
71 " mvc 2304(256,%0),2304(%1)\n"
72 " mvc 2560(256,%0),2560(%1)\n"
73 " mvc 2816(256,%0),2816(%1)\n"
74 " mvc 3072(256,%0),3072(%1)\n"
75 " mvc 3328(256,%0),3328(%1)\n"
76 " mvc 3584(256,%0),3584(%1)\n"
77 " mvc 3840(256,%0),3840(%1)\n"
78 : : "a" (to), "a" (from) : "memory");
79}
80
81#define clear_user_page(page, vaddr, pg) clear_page(page)
82#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
83
84#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
85 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
86#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
87
88/*
89 * These are used to make use of C type-checking..
90 */
91
92typedef struct { unsigned long pgprot; } pgprot_t;
93typedef struct { unsigned long pgste; } pgste_t;
94typedef struct { unsigned long pte; } pte_t;
95typedef struct { unsigned long pmd; } pmd_t;
96typedef struct { unsigned long pud; } pud_t;
97typedef struct { unsigned long pgd; } pgd_t;
98typedef pte_t *pgtable_t;
99
100#define pgprot_val(x) ((x).pgprot)
101#define pgste_val(x) ((x).pgste)
102#define pte_val(x) ((x).pte)
103#define pmd_val(x) ((x).pmd)
104#define pud_val(x) ((x).pud)
105#define pgd_val(x) ((x).pgd)
106
107#define __pgste(x) ((pgste_t) { (x) } )
108#define __pte(x) ((pte_t) { (x) } )
109#define __pmd(x) ((pmd_t) { (x) } )
110#define __pud(x) ((pud_t) { (x) } )
111#define __pgd(x) ((pgd_t) { (x) } )
112#define __pgprot(x) ((pgprot_t) { (x) } )
113
114static inline void page_set_storage_key(unsigned long addr,
115 unsigned char skey, int mapped)
116{
117 if (!mapped)
118 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
119 : : "d" (skey), "a" (addr));
120 else
121 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
122}
123
124static inline unsigned char page_get_storage_key(unsigned long addr)
125{
126 unsigned char skey;
127
128 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
129 return skey;
130}
131
132static inline int page_reset_referenced(unsigned long addr)
133{
134 unsigned int ipm;
135
136 asm volatile(
137 " rrbe 0,%1\n"
138 " ipm %0\n"
139 : "=d" (ipm) : "a" (addr) : "cc");
140 return !!(ipm & 0x20000000);
141}
142
143/* Bits int the storage key */
144#define _PAGE_CHANGED 0x02 /* HW changed bit */
145#define _PAGE_REFERENCED 0x04 /* HW referenced bit */
146#define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
147#define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
148
149/*
150 * Test and clear dirty bit in storage key.
151 * We can't clear the changed bit atomically. This is a potential
152 * race against modification of the referenced bit. This function
153 * should therefore only be called if it is not mapped in any
154 * address space.
155 */
156#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
157static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped)
158{
159 unsigned char skey;
160
161 skey = page_get_storage_key(pfn << PAGE_SHIFT);
162 if (!(skey & _PAGE_CHANGED))
163 return 0;
164 page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped);
165 return 1;
166}
167
168/*
169 * Test and clear referenced bit in storage key.
170 */
171#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
172static inline int page_test_and_clear_young(unsigned long pfn)
173{
174 return page_reset_referenced(pfn << PAGE_SHIFT);
175}
176
177struct page;
178void arch_free_page(struct page *page, int order);
179void arch_alloc_page(struct page *page, int order);
180void arch_set_page_states(int make_stable);
181
182static inline int devmem_is_allowed(unsigned long pfn)
183{
184 return 0;
185}
186
187#define HAVE_ARCH_FREE_PAGE
188#define HAVE_ARCH_ALLOC_PAGE
189
190#endif /* !__ASSEMBLY__ */
191
192#define __PAGE_OFFSET 0x0UL
193#define PAGE_OFFSET 0x0UL
194#define __pa(x) (unsigned long)(x)
195#define __va(x) (void *)(unsigned long)(x)
196#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
197#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
198#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
199
200#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
201 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
202
203#include <asm-generic/memory_model.h>
204#include <asm-generic/getorder.h>
205
206#define __HAVE_ARCH_GATE_AREA 1
207
208#endif /* _S390_PAGE_H */
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
38void __storage_key_init_range(unsigned long start, unsigned long end);
39
40static 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 */
53static 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
78typedef struct { unsigned long pgprot; } pgprot_t;
79typedef struct { unsigned long pgste; } pgste_t;
80typedef struct { unsigned long pte; } pte_t;
81typedef struct { unsigned long pmd; } pmd_t;
82typedef struct { unsigned long pud; } pud_t;
83typedef struct { unsigned long p4d; } p4d_t;
84typedef struct { unsigned long pgd; } pgd_t;
85typedef pte_t *pgtable_t;
86
87#define pgprot_val(x) ((x).pgprot)
88#define pgste_val(x) ((x).pgste)
89
90static inline unsigned long pte_val(pte_t pte)
91{
92 return pte.pte;
93}
94
95static inline unsigned long pmd_val(pmd_t pmd)
96{
97 return pmd.pmd;
98}
99
100static inline unsigned long pud_val(pud_t pud)
101{
102 return pud.pud;
103}
104
105static inline unsigned long p4d_val(p4d_t p4d)
106{
107 return p4d.p4d;
108}
109
110static 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
123static 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
133static 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
141static 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
160struct page;
161struct folio;
162void arch_free_page(struct page *page, int order);
163void arch_alloc_page(struct page *page, int order);
164
165static 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
173int arch_make_folio_accessible(struct folio *folio);
174#define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE
175
176struct 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
183extern 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#define __identity_base vm_layout.identity_base
188#define ident_map_size vm_layout.identity_size
189
190static inline unsigned long kaslr_offset(void)
191{
192 return __kaslr_offset;
193}
194
195extern int __kaslr_enabled;
196static inline int kaslr_enabled(void)
197{
198 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
199 return __kaslr_enabled;
200 return 0;
201}
202
203#define __PAGE_OFFSET __identity_base
204#define PAGE_OFFSET __PAGE_OFFSET
205
206#ifdef __DECOMPRESSOR
207
208#define __pa_nodebug(x) ((unsigned long)(x))
209#define __pa(x) __pa_nodebug(x)
210#define __pa32(x) __pa(x)
211#define __va(x) ((void *)(unsigned long)(x))
212
213#else /* __DECOMPRESSOR */
214
215static inline unsigned long __pa_nodebug(unsigned long x)
216{
217 if (x < __kaslr_offset)
218 return x - __identity_base;
219 return x - __kaslr_offset + __kaslr_offset_phys;
220}
221
222#ifdef CONFIG_DEBUG_VIRTUAL
223
224unsigned long __phys_addr(unsigned long x, bool is_31bit);
225
226#else /* CONFIG_DEBUG_VIRTUAL */
227
228static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
229{
230 return __pa_nodebug(x);
231}
232
233#endif /* CONFIG_DEBUG_VIRTUAL */
234
235#define __pa(x) __phys_addr((unsigned long)(x), false)
236#define __pa32(x) __phys_addr((unsigned long)(x), true)
237#define __va(x) ((void *)((unsigned long)(x) + __identity_base))
238
239#endif /* __DECOMPRESSOR */
240
241#define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
242#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
243
244#define phys_to_folio(phys) page_folio(phys_to_page(phys))
245#define folio_to_phys(page) pfn_to_phys(folio_pfn(folio))
246
247static inline void *pfn_to_virt(unsigned long pfn)
248{
249 return __va(pfn_to_phys(pfn));
250}
251
252static inline unsigned long virt_to_pfn(const void *kaddr)
253{
254 return phys_to_pfn(__pa(kaddr));
255}
256
257#define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
258
259#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
260#define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
261
262#define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
263
264#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
265
266#endif /* !__ASSEMBLY__ */
267
268#include <asm-generic/memory_model.h>
269#include <asm-generic/getorder.h>
270
271#define AMODE31_SIZE (3 * PAGE_SIZE)
272
273#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
274#define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE
275#define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
276
277#define TEXT_OFFSET 0x100000
278
279#endif /* _S390_PAGE_H */