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); 19 void protect_kernel_text_data(void); 20 #else 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; } 27 #endif 28 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); 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 */ 46