1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright 2017, Michael Ellerman, IBM Corporation. 4 */ 5 #ifndef _LINUX_SET_MEMORY_H_ 6 #define _LINUX_SET_MEMORY_H_ 7 8 #ifdef CONFIG_ARCH_HAS_SET_MEMORY 9 #include <asm/set_memory.h> 10 #else 11 static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; } 12 static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; } 13 static inline int set_memory_x(unsigned long addr, int numpages) { return 0; } 14 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; } 15 #endif 16 17 #ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP 18 static inline int set_direct_map_invalid_noflush(struct page *page) 19 { 20 return 0; 21 } 22 static inline int set_direct_map_default_noflush(struct page *page) 23 { 24 return 0; 25 } 26 27 static inline bool kernel_page_present(struct page *page) 28 { 29 return true; 30 } 31 #else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */ 32 /* 33 * Some architectures, e.g. ARM64 can disable direct map modifications at 34 * boot time. Let them overrive this query. 35 */ 36 #ifndef can_set_direct_map 37 static inline bool can_set_direct_map(void) 38 { 39 return true; 40 } 41 #define can_set_direct_map can_set_direct_map 42 #endif 43 #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */ 44 45 #ifndef set_mce_nospec 46 static inline int set_mce_nospec(unsigned long pfn, bool unmap) 47 { 48 return 0; 49 } 50 #endif 51 52 #ifndef clear_mce_nospec 53 static inline int clear_mce_nospec(unsigned long pfn) 54 { 55 return 0; 56 } 57 #endif 58 59 #ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT 60 static inline int set_memory_encrypted(unsigned long addr, int numpages) 61 { 62 return 0; 63 } 64 65 static inline int set_memory_decrypted(unsigned long addr, int numpages) 66 { 67 return 0; 68 } 69 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 70 71 #endif /* _LINUX_SET_MEMORY_H_ */ 72