xref: /openbmc/linux/arch/arm/mm/cache-v4.S (revision 8e774e02) 
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 <asm/assembler.h>
10#include <asm/page.h>
11#include "proc-macros.S"
12
13/*
14 *	flush_icache_all()
15 *
16 *	Unconditionally clean and invalidate the entire icache.
17 */
18ENTRY(v4_flush_icache_all)
19	ret	lr
20ENDPROC(v4_flush_icache_all)
21
22/*
23 *	flush_user_cache_all()
24 *
25 *	Invalidate all cache entries in a particular address
26 *	space.
27 *
28 *	- mm	- mm_struct describing address space
29 */
30ENTRY(v4_flush_user_cache_all)
31	/* FALLTHROUGH */
32/*
33 *	flush_kern_cache_all()
34 *
35 *	Clean and invalidate the entire cache.
36 */
37ENTRY(v4_flush_kern_cache_all)
38#ifdef CONFIG_CPU_CP15
39	mov	r0, #0
40	mcr	p15, 0, r0, c7, c7, 0		@ flush ID cache
41	ret	lr
42#else
43	/* FALLTHROUGH */
44#endif
45
46/*
47 *	flush_user_cache_range(start, end, flags)
48 *
49 *	Invalidate a range of cache entries in the specified
50 *	address space.
51 *
52 *	- start - start address (may not be aligned)
53 *	- end	- end address (exclusive, may not be aligned)
54 *	- flags	- vma_area_struct flags describing address space
55 */
56ENTRY(v4_flush_user_cache_range)
57#ifdef CONFIG_CPU_CP15
58	mov	ip, #0
59	mcr	p15, 0, ip, c7, c7, 0		@ flush ID cache
60	ret	lr
61#else
62	/* FALLTHROUGH */
63#endif
64
65/*
66 *	coherent_kern_range(start, end)
67 *
68 *	Ensure coherency between the Icache and the Dcache in the
69 *	region described by start.  If you have non-snooping
70 *	Harvard caches, you need to implement this function.
71 *
72 *	- start  - virtual start address
73 *	- end	 - virtual end address
74 */
75ENTRY(v4_coherent_kern_range)
76	/* FALLTHROUGH */
77
78/*
79 *	coherent_user_range(start, end)
80 *
81 *	Ensure coherency between the Icache and the Dcache in the
82 *	region described by start.  If you have non-snooping
83 *	Harvard caches, you need to implement this function.
84 *
85 *	- start  - virtual start address
86 *	- end	 - virtual end address
87 */
88ENTRY(v4_coherent_user_range)
89	mov	r0, #0
90	ret	lr
91
92/*
93 *	flush_kern_dcache_area(void *addr, size_t size)
94 *
95 *	Ensure no D cache aliasing occurs, either with itself or
96 *	the I cache
97 *
98 *	- addr	- kernel address
99 *	- size	- region size
100 */
101ENTRY(v4_flush_kern_dcache_area)
102	/* FALLTHROUGH */
103
104/*
105 *	dma_flush_range(start, end)
106 *
107 *	Clean and invalidate the specified virtual address range.
108 *
109 *	- start  - virtual start address
110 *	- end	 - virtual end address
111 */
112ENTRY(v4_dma_flush_range)
113#ifdef CONFIG_CPU_CP15
114	mov	r0, #0
115	mcr	p15, 0, r0, c7, c7, 0		@ flush ID cache
116#endif
117	ret	lr
118
119/*
120 *	dma_unmap_area(start, size, dir)
121 *	- start	- kernel virtual start address
122 *	- size	- size of region
123 *	- dir	- DMA direction
124 */
125ENTRY(v4_dma_unmap_area)
126	teq	r2, #DMA_TO_DEVICE
127	bne	v4_dma_flush_range
128	/* FALLTHROUGH */
129
130/*
131 *	dma_map_area(start, size, dir)
132 *	- start	- kernel virtual start address
133 *	- size	- size of region
134 *	- dir	- DMA direction
135 */
136ENTRY(v4_dma_map_area)
137	ret	lr
138ENDPROC(v4_dma_unmap_area)
139ENDPROC(v4_dma_map_area)
140
141	.globl	v4_flush_kern_cache_louis
142	.equ	v4_flush_kern_cache_louis, v4_flush_kern_cache_all
143
144	__INITDATA
145
146	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
147	define_cache_functions v4
148