Linux kernel mirror (for testing)
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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 the entire icache.
18 */
19SYM_TYPED_FUNC_START(v4_flush_icache_all)
20 ret lr
21SYM_FUNC_END(v4_flush_icache_all)
22
23/*
24 * flush_user_cache_all()
25 *
26 * Invalidate all cache entries in a particular address
27 * space.
28 *
29 * - mm - mm_struct describing address space
30 */
31SYM_FUNC_ALIAS(v4_flush_user_cache_all, v4_flush_kern_cache_all)
32
33/*
34 * flush_kern_cache_all()
35 *
36 * Clean and invalidate the entire cache.
37 */
38SYM_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 @ flush ID cache
42 ret lr
43#else
44 ret lr
45#endif
46SYM_FUNC_END(v4_flush_kern_cache_all)
47
48/*
49 * flush_user_cache_range(start, end, flags)
50 *
51 * Invalidate a range of cache entries in the specified
52 * address space.
53 *
54 * - start - start address (may not be aligned)
55 * - end - end address (exclusive, may not be aligned)
56 * - flags - vma_area_struct flags describing address space
57 */
58SYM_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 @ flush ID cache
62 ret lr
63#else
64 ret lr
65#endif
66SYM_FUNC_END(v4_flush_user_cache_range)
67
68/*
69 * coherent_kern_range(start, end)
70 *
71 * Ensure coherency between the Icache and the Dcache in the
72 * region described by start. If you have non-snooping
73 * Harvard caches, you need to implement this function.
74 *
75 * - start - virtual start address
76 * - end - virtual end address
77 */
78SYM_TYPED_FUNC_START(v4_coherent_kern_range)
79 ret lr
80SYM_FUNC_END(v4_coherent_kern_range)
81
82/*
83 * coherent_user_range(start, end)
84 *
85 * Ensure coherency between the Icache and the Dcache in the
86 * region described by start. If you have non-snooping
87 * Harvard caches, you need to implement this function.
88 *
89 * - start - virtual start address
90 * - end - virtual end address
91 */
92SYM_TYPED_FUNC_START(v4_coherent_user_range)
93 mov r0, #0
94 ret lr
95SYM_FUNC_END(v4_coherent_user_range)
96
97/*
98 * flush_kern_dcache_area(void *addr, size_t size)
99 *
100 * Ensure no D cache aliasing occurs, either with itself or
101 * the I cache
102 *
103 * - addr - kernel address
104 * - size - region size
105 */
106SYM_TYPED_FUNC_START(v4_flush_kern_dcache_area)
107#ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
108 b v4_dma_flush_range
109#endif
110SYM_FUNC_END(v4_flush_kern_dcache_area)
111
112/*
113 * dma_flush_range(start, end)
114 *
115 * Clean and invalidate the specified virtual address range.
116 *
117 * - start - virtual start address
118 * - end - virtual end address
119 */
120SYM_TYPED_FUNC_START(v4_dma_flush_range)
121#ifdef CONFIG_CPU_CP15
122 mov r0, #0
123 mcr p15, 0, r0, c7, c7, 0 @ flush ID cache
124#endif
125 ret lr
126SYM_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 */
134SYM_TYPED_FUNC_START(v4_dma_unmap_area)
135 teq r2, #DMA_TO_DEVICE
136 bne v4_dma_flush_range
137 ret lr
138SYM_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 */
146SYM_TYPED_FUNC_START(v4_dma_map_area)
147 ret lr
148SYM_FUNC_END(v4_dma_map_area)