1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2019 SiFive
6 #ifndef _ASM_RISCV_SET_MEMORY_H
7 #define _ASM_RISCV_SET_MEMORY_H
11 * Functions to change memory attributes.
14 int set_memory_ro(unsigned long addr, int numpages);
15 int set_memory_rw(unsigned long addr, int numpages);
16 int set_memory_x(unsigned long addr, int numpages);
17 int set_memory_nx(unsigned long addr, int numpages);
18 int set_memory_rw_nx(unsigned long addr, int numpages);
19 void protect_kernel_text_data(void);
21 static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
22 static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
23 static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
24 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
25 static inline void protect_kernel_text_data(void) {}
26 static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
29 int set_direct_map_invalid_noflush(struct page *page);
30 int set_direct_map_default_noflush(struct page *page);
31 bool kernel_page_present(struct page *page);
33 #endif /* __ASSEMBLY__ */
35 #ifdef CONFIG_STRICT_KERNEL_RWX
37 #define SECTION_ALIGN (1 << 21)
39 #define SECTION_ALIGN (1 << 22)
41 #else /* !CONFIG_STRICT_KERNEL_RWX */
42 #define SECTION_ALIGN L1_CACHE_BYTES
43 #endif /* CONFIG_STRICT_KERNEL_RWX */
45 #endif /* _ASM_RISCV_SET_MEMORY_H */