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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 12
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 0
23#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
24
25#define HPAGE_SHIFT 20
26#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
27#define HPAGE_MASK (~(HPAGE_SIZE - 1))
28#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
29#define HUGE_MAX_HSTATE 2
30
31#define ARCH_HAS_SETCLEAR_HUGE_PTE
32#define ARCH_HAS_HUGE_PTE_TYPE
33#define ARCH_HAS_PREPARE_HUGEPAGE
34#define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
35
36#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
37
38#include <asm/setup.h>
39#ifndef __ASSEMBLY__
40
41void __storage_key_init_range(unsigned long start, unsigned long end);
42
43static inline void storage_key_init_range(unsigned long start, unsigned long end)
44{
45 if (PAGE_DEFAULT_KEY != 0)
46 __storage_key_init_range(start, end);
47}
48
49#define clear_page(page) memset((page), 0, PAGE_SIZE)
50
51/*
52 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
53 * bypass caches when copying a page. Especially when copying huge pages
54 * this keeps L1 and L2 data caches alive.
55 */
56static inline void copy_page(void *to, void *from)
57{
58 union register_pair dst, src;
59
60 dst.even = (unsigned long) to;
61 dst.odd = 0x1000;
62 src.even = (unsigned long) from;
63 src.odd = 0xb0001000;
64
65 asm volatile(
66 " mvcl %[dst],%[src]"
67 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair)
68 : : "memory", "cc");
69}
70
71#define clear_user_page(page, vaddr, pg) clear_page(page)
72#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
73
74#define alloc_zeroed_user_highpage_movable(vma, vaddr) \
75 alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vaddr)
76#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE
77
78/*
79 * These are used to make use of C type-checking..
80 */
81
82typedef struct { unsigned long pgprot; } pgprot_t;
83typedef struct { unsigned long pgste; } pgste_t;
84typedef struct { unsigned long pte; } pte_t;
85typedef struct { unsigned long pmd; } pmd_t;
86typedef struct { unsigned long pud; } pud_t;
87typedef struct { unsigned long p4d; } p4d_t;
88typedef struct { unsigned long pgd; } pgd_t;
89typedef pte_t *pgtable_t;
90
91#define pgprot_val(x) ((x).pgprot)
92#define pgste_val(x) ((x).pgste)
93#define pte_val(x) ((x).pte)
94#define pmd_val(x) ((x).pmd)
95#define pud_val(x) ((x).pud)
96#define p4d_val(x) ((x).p4d)
97#define pgd_val(x) ((x).pgd)
98
99#define __pgste(x) ((pgste_t) { (x) } )
100#define __pte(x) ((pte_t) { (x) } )
101#define __pmd(x) ((pmd_t) { (x) } )
102#define __pud(x) ((pud_t) { (x) } )
103#define __p4d(x) ((p4d_t) { (x) } )
104#define __pgd(x) ((pgd_t) { (x) } )
105#define __pgprot(x) ((pgprot_t) { (x) } )
106
107static inline void page_set_storage_key(unsigned long addr,
108 unsigned char skey, int mapped)
109{
110 if (!mapped)
111 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
112 : : "d" (skey), "a" (addr));
113 else
114 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
115}
116
117static inline unsigned char page_get_storage_key(unsigned long addr)
118{
119 unsigned char skey;
120
121 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
122 return skey;
123}
124
125static inline int page_reset_referenced(unsigned long addr)
126{
127 int cc;
128
129 asm volatile(
130 " rrbe 0,%1\n"
131 " ipm %0\n"
132 " srl %0,28\n"
133 : "=d" (cc) : "a" (addr) : "cc");
134 return cc;
135}
136
137/* Bits int the storage key */
138#define _PAGE_CHANGED 0x02 /* HW changed bit */
139#define _PAGE_REFERENCED 0x04 /* HW referenced bit */
140#define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
141#define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
142
143struct page;
144void arch_free_page(struct page *page, int order);
145void arch_alloc_page(struct page *page, int order);
146void arch_set_page_dat(struct page *page, int order);
147void arch_set_page_nodat(struct page *page, int order);
148int arch_test_page_nodat(struct page *page);
149void arch_set_page_states(int make_stable);
150
151static inline int devmem_is_allowed(unsigned long pfn)
152{
153 return 0;
154}
155
156#define HAVE_ARCH_FREE_PAGE
157#define HAVE_ARCH_ALLOC_PAGE
158
159#if IS_ENABLED(CONFIG_PGSTE)
160int arch_make_page_accessible(struct page *page);
161#define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
162#endif
163
164#endif /* !__ASSEMBLY__ */
165
166#define __PAGE_OFFSET 0x0UL
167#define PAGE_OFFSET 0x0UL
168
169#define __pa(x) ((unsigned long)(x))
170#define __va(x) ((void *)(unsigned long)(x))
171
172#define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
173#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
174
175#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
176#define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
177
178#define pfn_to_virt(pfn) __va(pfn_to_phys(pfn))
179#define virt_to_pfn(kaddr) (phys_to_pfn(__pa(kaddr)))
180#define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
181
182#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
183#define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
184
185#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
186
187#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
188
189#include <asm-generic/memory_model.h>
190#include <asm-generic/getorder.h>
191
192#endif /* _S390_PAGE_H */