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
11static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
12static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
13static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
14static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
15#endif
16
17#ifndef set_memory_rox
18static 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
28static inline int set_direct_map_invalid_noflush(struct page *page)
29{
30 return 0;
31}
32static inline int set_direct_map_default_noflush(struct page *page)
33{
34 return 0;
35}
36
37static 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
47static 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
56int set_mce_nospec(unsigned long pfn);
57int clear_mce_nospec(unsigned long pfn);
58#else
59static inline int set_mce_nospec(unsigned long pfn)
60{
61 return 0;
62}
63static inline int clear_mce_nospec(unsigned long pfn)
64{
65 return 0;
66}
67#endif
68
69#ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
70static inline int set_memory_encrypted(unsigned long addr, int numpages)
71{
72 return 0;
73}
74
75static 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

source code of linux/include/linux/set_memory.h