1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/arm/mm/cache-v4.S
4 *
5 * Copyright (C) 1997-2002 Russell king
6 */
7 #include <linux/linkage.h>
8 #include <linux/init.h>
9 #include <linux/cfi_types.h>
10 #include <asm/assembler.h>
11 #include <asm/page.h>
12 #include "proc-macros.S"
13
14 /*
15 * flush_icache_all()
16 *
17 * Unconditionally clean and invalidate t
18 */
19 SYM_TYPED_FUNC_START(v4_flush_icache_all)
20 ret lr
21 SYM_FUNC_END(v4_flush_icache_all)
22
23 /*
24 * flush_user_cache_all()
25 *
26 * Invalidate all cache entries in a part
27 * space.
28 *
29 * - mm - mm_struct describing address
30 */
31 SYM_FUNC_ALIAS(v4_flush_user_cache_all, v4_flu
32
33 /*
34 * flush_kern_cache_all()
35 *
36 * Clean and invalidate the entire cache.
37 */
38 SYM_TYPED_FUNC_START(v4_flush_kern_cache_all)
39 #ifdef CONFIG_CPU_CP15
40 mov r0, #0
41 mcr p15, 0, r0, c7, c7, 0
42 ret lr
43 #else
44 ret lr
45 #endif
46 SYM_FUNC_END(v4_flush_kern_cache_all)
47
48 /*
49 * flush_user_cache_range(start, end, fla
50 *
51 * Invalidate a range of cache entries in
52 * address space.
53 *
54 * - start - start address (may not be al
55 * - end - end address (exclusive, may
56 * - flags - vma_area_struct flags descri
57 */
58 SYM_TYPED_FUNC_START(v4_flush_user_cache_range
59 #ifdef CONFIG_CPU_CP15
60 mov ip, #0
61 mcr p15, 0, ip, c7, c7, 0
62 ret lr
63 #else
64 ret lr
65 #endif
66 SYM_FUNC_END(v4_flush_user_cache_range)
67
68 /*
69 * coherent_kern_range(start, end)
70 *
71 * Ensure coherency between the Icache an
72 * region described by start. If you hav
73 * Harvard caches, you need to implement
74 *
75 * - start - virtual start address
76 * - end - virtual end address
77 */
78 SYM_TYPED_FUNC_START(v4_coherent_kern_range)
79 ret lr
80 SYM_FUNC_END(v4_coherent_kern_range)
81
82 /*
83 * coherent_user_range(start, end)
84 *
85 * Ensure coherency between the Icache an
86 * region described by start. If you hav
87 * Harvard caches, you need to implement
88 *
89 * - start - virtual start address
90 * - end - virtual end address
91 */
92 SYM_TYPED_FUNC_START(v4_coherent_user_range)
93 mov r0, #0
94 ret lr
95 SYM_FUNC_END(v4_coherent_user_range)
96
97 /*
98 * flush_kern_dcache_area(void *addr, siz
99 *
100 * Ensure no D cache aliasing occurs, eit
101 * the I cache
102 *
103 * - addr - kernel address
104 * - size - region size
105 */
106 SYM_TYPED_FUNC_START(v4_flush_kern_dcache_area
107 #ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI
108 b v4_dma_flush_range
109 #endif
110 SYM_FUNC_END(v4_flush_kern_dcache_area)
111
112 /*
113 * dma_flush_range(start, end)
114 *
115 * Clean and invalidate the specified vir
116 *
117 * - start - virtual start address
118 * - end - virtual end address
119 */
120 SYM_TYPED_FUNC_START(v4_dma_flush_range)
121 #ifdef CONFIG_CPU_CP15
122 mov r0, #0
123 mcr p15, 0, r0, c7, c7, 0
124 #endif
125 ret lr
126 SYM_FUNC_END(v4_dma_flush_range)
127
128 /*
129 * dma_unmap_area(start, size, dir)
130 * - start - kernel virtual start address
131 * - size - size of region
132 * - dir - DMA direction
133 */
134 SYM_TYPED_FUNC_START(v4_dma_unmap_area)
135 teq r2, #DMA_TO_DEVICE
136 bne v4_dma_flush_range
137 ret lr
138 SYM_FUNC_END(v4_dma_unmap_area)
139
140 /*
141 * dma_map_area(start, size, dir)
142 * - start - kernel virtual start address
143 * - size - size of region
144 * - dir - DMA direction
145 */
146 SYM_TYPED_FUNC_START(v4_dma_map_area)
147 ret lr
148 SYM_FUNC_END(v4_dma_map_area)
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