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Linux kernel mirror (for testing)
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2019 SiFive
4 */
5
6#ifndef _ASM_RISCV_SET_MEMORY_H
7#define _ASM_RISCV_SET_MEMORY_H
8
9#ifndef __ASSEMBLY__
10/*
11 * Functions to change memory attributes.
12 */
13#ifdef CONFIG_MMU
14int set_memory_ro(unsigned long addr, int numpages);
15int set_memory_rw(unsigned long addr, int numpages);
16int set_memory_x(unsigned long addr, int numpages);
17int set_memory_nx(unsigned long addr, int numpages);
18int set_memory_rw_nx(unsigned long addr, int numpages);
19void protect_kernel_text_data(void);
20#else
21static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
22static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
23static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
24static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
25static inline void protect_kernel_text_data(void) {};
26static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
27#endif
28
29int set_direct_map_invalid_noflush(struct page *page);
30int set_direct_map_default_noflush(struct page *page);
31bool kernel_page_present(struct page *page);
32
33#endif /* __ASSEMBLY__ */
34
35#ifdef CONFIG_STRICT_KERNEL_RWX
36#ifdef CONFIG_64BIT
37#define SECTION_ALIGN (1 << 21)
38#else
39#define SECTION_ALIGN (1 << 22)
40#endif
41#else /* !CONFIG_STRICT_KERNEL_RWX */
42#define SECTION_ALIGN L1_CACHE_BYTES
43#endif /* CONFIG_STRICT_KERNEL_RWX */
44
45#endif /* _ASM_RISCV_SET_MEMORY_H */