| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2019 SiFive |
| */ |
| |
| #ifndef _ASM_RISCV_SET_MEMORY_H |
| #define _ASM_RISCV_SET_MEMORY_H |
| |
| #ifndef __ASSEMBLY__ |
| /* |
| * Functions to change memory attributes. |
| */ |
| #ifdef CONFIG_MMU |
| int set_memory_ro(unsigned long addr, int numpages); |
| int set_memory_rw(unsigned long addr, int numpages); |
| int set_memory_x(unsigned long addr, int numpages); |
| int set_memory_nx(unsigned long addr, int numpages); |
| int set_memory_rw_nx(unsigned long addr, int numpages); |
| void protect_kernel_text_data(void); |
| #else |
| static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; } |
| static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; } |
| static inline int set_memory_x(unsigned long addr, int numpages) { return 0; } |
| static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; } |
| static inline void protect_kernel_text_data(void) {} |
| static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; } |
| #endif |
| |
| int set_direct_map_invalid_noflush(struct page *page); |
| int set_direct_map_default_noflush(struct page *page); |
| bool kernel_page_present(struct page *page); |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #ifdef CONFIG_STRICT_KERNEL_RWX |
| #ifdef CONFIG_64BIT |
| #define SECTION_ALIGN (1 << 21) |
| #else |
| #define SECTION_ALIGN (1 << 22) |
| #endif |
| #else /* !CONFIG_STRICT_KERNEL_RWX */ |
| #define SECTION_ALIGN L1_CACHE_BYTES |
| #endif /* CONFIG_STRICT_KERNEL_RWX */ |
| |
| #endif /* _ASM_RISCV_SET_MEMORY_H */ |
