1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_GENERIC_CACHEFLUSH_H
3 #define _ASM_GENERIC_CACHEFLUSH_H
4 
5 struct mm_struct;
6 struct vm_area_struct;
7 struct page;
8 struct address_space;
9 
10 /*
11  * The cache doesn't need to be flushed when TLB entries change when
12  * the cache is mapped to physical memory, not virtual memory
13  */
14 #ifndef flush_cache_all
15 static inline void flush_cache_all(void)
16 {
17 }
18 #endif
19 
20 #ifndef flush_cache_mm
21 static inline void flush_cache_mm(struct mm_struct *mm)
22 {
23 }
24 #endif
25 
26 #ifndef flush_cache_dup_mm
27 static inline void flush_cache_dup_mm(struct mm_struct *mm)
28 {
29 }
30 #endif
31 
32 #ifndef flush_cache_range
33 static inline void flush_cache_range(struct vm_area_struct *vma,
34 				     unsigned long start,
35 				     unsigned long end)
36 {
37 }
38 #endif
39 
40 #ifndef flush_cache_page
41 static inline void flush_cache_page(struct vm_area_struct *vma,
42 				    unsigned long vmaddr,
43 				    unsigned long pfn)
44 {
45 }
46 #endif
47 
48 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
49 static inline void flush_dcache_page(struct page *page)
50 {
51 }
52 
53 static inline void flush_dcache_folio(struct folio *folio) { }
54 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
55 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO
56 #endif
57 
58 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO
59 void flush_dcache_folio(struct folio *folio);
60 #endif
61 
62 #ifndef flush_dcache_mmap_lock
63 static inline void flush_dcache_mmap_lock(struct address_space *mapping)
64 {
65 }
66 #endif
67 
68 #ifndef flush_dcache_mmap_unlock
69 static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
70 {
71 }
72 #endif
73 
74 #ifndef flush_icache_range
75 static inline void flush_icache_range(unsigned long start, unsigned long end)
76 {
77 }
78 #endif
79 
80 #ifndef flush_icache_user_range
81 #define flush_icache_user_range flush_icache_range
82 #endif
83 
84 #ifndef flush_icache_page
85 static inline void flush_icache_page(struct vm_area_struct *vma,
86 				     struct page *page)
87 {
88 }
89 #endif
90 
91 #ifndef flush_icache_user_page
92 static inline void flush_icache_user_page(struct vm_area_struct *vma,
93 					   struct page *page,
94 					   unsigned long addr, int len)
95 {
96 }
97 #endif
98 
99 #ifndef flush_cache_vmap
100 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
101 {
102 }
103 #endif
104 
105 #ifndef flush_cache_vunmap
106 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
107 {
108 }
109 #endif
110 
111 #ifndef copy_to_user_page
112 #define copy_to_user_page(vma, page, vaddr, dst, src, len)	\
113 	do { \
114 		memcpy(dst, src, len); \
115 		flush_icache_user_page(vma, page, vaddr, len); \
116 	} while (0)
117 #endif
118 
119 #ifndef copy_from_user_page
120 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
121 	memcpy(dst, src, len)
122 #endif
123 
124 #endif /* _ASM_GENERIC_CACHEFLUSH_H */
125