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
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);
set_kernel_memory(char * startp,char * endp,int (* set_memory)(unsigned long start,int num_pages))19 static __always_inline int set_kernel_memory(char *startp, char *endp,
20 int (*set_memory)(unsigned long start,
21 int num_pages))
22 {
23 unsigned long start = (unsigned long)startp;
24 unsigned long end = (unsigned long)endp;
25 int num_pages = PAGE_ALIGN(end - start) >> PAGE_SHIFT;
26
27 return set_memory(start, num_pages);
28 }
29 #else
set_memory_ro(unsigned long addr,int numpages)30 static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
set_memory_rw(unsigned long addr,int numpages)31 static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
set_memory_x(unsigned long addr,int numpages)32 static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
set_memory_nx(unsigned long addr,int numpages)33 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
set_memory_rw_nx(unsigned long addr,int numpages)34 static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; }
set_kernel_memory(char * startp,char * endp,int (* set_memory)(unsigned long start,int num_pages))35 static inline int set_kernel_memory(char *startp, char *endp,
36 int (*set_memory)(unsigned long start,
37 int num_pages))
38 {
39 return 0;
40 }
41 #endif
42
43 int set_direct_map_invalid_noflush(struct page *page);
44 int set_direct_map_default_noflush(struct page *page);
45 bool kernel_page_present(struct page *page);
46
47 #endif /* __ASSEMBLY__ */
48
49 #ifdef CONFIG_STRICT_KERNEL_RWX
50 #ifdef CONFIG_64BIT
51 #define SECTION_ALIGN (1 << 21)
52 #else
53 #define SECTION_ALIGN (1 << 22)
54 #endif
55 #else /* !CONFIG_STRICT_KERNEL_RWX */
56 #define SECTION_ALIGN L1_CACHE_BYTES
57 #endif /* CONFIG_STRICT_KERNEL_RWX */
58
59 #endif /* _ASM_RISCV_SET_MEMORY_H */
60