1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright 2017, Michael Ellerman, IBM Corporation.
4 */
5 #ifndef _LINUX_SET_MEMORY_H_
6 #define _LINUX_SET_MEMORY_H_
7
8 #ifdef CONFIG_ARCH_HAS_SET_MEMORY
9 #include <asm/set_memory.h>
10 #else
11 static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
12 static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
13 static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
14 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
15 #endif
16
17 #ifndef set_memory_rox
18 static inline int set_memory_rox(unsigned long addr, int numpages)
19 {
20 int ret = set_memory_ro(addr, numpages);
21 if (ret)
22 return ret;
23 return set_memory_x(addr, numpages);
24 }
25 #endif
26
27 #ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP
28 static inline int set_direct_map_invalid_noflush(struct page *page)
29 {
30 return 0;
31 }
32 static inline int set_direct_map_default_noflush(struct page *page)
33 {
34 return 0;
35 }
36
37 static inline bool kernel_page_present(struct page *page)
38 {
39 return true;
40 }
41 #else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
42 /*
43 * Some architectures, e.g. ARM64 can disable direct map modifications at
44 * boot time. Let them overrive this query.
45 */
46 #ifndef can_set_direct_map
47 static inline bool can_set_direct_map(void)
48 {
49 return true;
50 }
51 #define can_set_direct_map can_set_direct_map
52 #endif
53 #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
54
55 #ifdef CONFIG_X86_64
56 int set_mce_nospec(unsigned long pfn);
57 int clear_mce_nospec(unsigned long pfn);
58 #else
59 static inline int set_mce_nospec(unsigned long pfn)
60 {
61 return 0;
62 }
63 static inline int clear_mce_nospec(unsigned long pfn)
64 {
65 return 0;
66 }
67 #endif
68
69 #ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
70 static inline int set_memory_encrypted(unsigned long addr, int numpages)
71 {
72 return 0;
73 }
74
75 static inline int set_memory_decrypted(unsigned long addr, int numpages)
76 {
77 return 0;
78 }
79 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
80
81 #endif /* _LINUX_SET_MEMORY_H_ */
82
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