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 __must_check set_memory_ro(unsigned long addr, int numpages) { return 0; } 12 static inline int __must_check set_memory_rw(unsigned long addr, int numpages) { return 0; } 13 static inline int __must_check set_memory_x(unsigned long addr, int numpages) { return 0; } 14 static inline int __must_check set_memory_nx(unsigned long addr, int numpages) { return 0; } 15 #endif 16 17 #ifndef set_memory_rox 18 static inline int set_memory_rox(unsigned long addr, int numpages) 19 { 20 int ret = set_memory_ro(addr, numpages); 21 if (ret) 22 return ret; 23 return set_memory_x(addr, numpages); 24 } 25 #endif 26 27 #ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP 28 static inline int set_direct_map_invalid_noflush(struct page *page) 29 { 30 return 0; 31 } 32 static inline int set_direct_map_default_noflush(struct page *page) 33 { 34 return 0; 35 } 36 37 static inline int set_direct_map_valid_noflush(struct page *page, 38 unsigned nr, bool valid) 39 { 40 return 0; 41 } 42 43 static inline bool kernel_page_present(struct page *page) 44 { 45 return true; 46 } 47 #else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */ 48 /* 49 * Some architectures, e.g. ARM64 can disable direct map modifications at 50 * boot time. Let them overrive this query. 51 */ 52 #ifndef can_set_direct_map 53 static inline bool can_set_direct_map(void) 54 { 55 return true; 56 } 57 #define can_set_direct_map can_set_direct_map 58 #endif 59 #endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */ 60 61 #ifdef CONFIG_X86_64 62 int set_mce_nospec(unsigned long pfn); 63 int clear_mce_nospec(unsigned long pfn); 64 #else 65 static inline int set_mce_nospec(unsigned long pfn) 66 { 67 return 0; 68 } 69 static inline int clear_mce_nospec(unsigned long pfn) 70 { 71 return 0; 72 } 73 #endif 74 75 #ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT 76 static inline int set_memory_encrypted(unsigned long addr, int numpages) 77 { 78 return 0; 79 } 80 81 static inline int set_memory_decrypted(unsigned long addr, int numpages) 82 { 83 return 0; 84 } 85 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 86 87 #endif /* _LINUX_SET_MEMORY_H_ */ 88