set_memory.h

 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 __must_check set_memory_ro(unsigned long addr, int numpages) { return 0; }
12static inline int __must_check set_memory_rw(unsigned long addr, int numpages) { return 0; }
13static inline int __must_check set_memory_x(unsigned long addr,  int numpages) { return 0; }
14static inline int __must_check 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 int set_direct_map_valid_noflush(struct page *page,
38					       unsigned nr, bool valid)
39{
40	return 0;
41}
42
43static inline bool kernel_page_present(struct page *page)
44{
45	return true;
46}
47#else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
48/*
49 * Some architectures, e.g. ARM64 can disable direct map modifications at
50 * boot time. Let them overrive this query.
51 */
52#ifndef can_set_direct_map
53static inline bool can_set_direct_map(void)
54{
55	return true;
56}
57#define can_set_direct_map can_set_direct_map
58#endif
59#endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
60
61#ifdef CONFIG_X86_64
62int set_mce_nospec(unsigned long pfn);
63int clear_mce_nospec(unsigned long pfn);
64#else
65static inline int set_mce_nospec(unsigned long pfn)
66{
67	return 0;
68}
69static inline int clear_mce_nospec(unsigned long pfn)
70{
71	return 0;
72}
73#endif
74
75#ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
76static inline int set_memory_encrypted(unsigned long addr, int numpages)
77{
78	return 0;
79}
80
81static inline int set_memory_decrypted(unsigned long addr, int numpages)
82{
83	return 0;
84}
85#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
86
87#endif /* _LINUX_SET_MEMORY_H_ */