xref: /openbmc/linux/arch/arm/mm/cache-v4.S (revision 95e9fd10) 
1/*
2 *  linux/arch/arm/mm/cache-v4.S
3 *
4 *  Copyright (C) 1997-2002 Russell king
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/linkage.h>
11#include <linux/init.h>
12#include <asm/page.h>
13#include "proc-macros.S"
14
15/*
16 *	flush_icache_all()
17 *
18 *	Unconditionally clean and invalidate the entire icache.
19 */
20ENTRY(v4_flush_icache_all)
21	mov	pc, lr
22ENDPROC(v4_flush_icache_all)
23
24/*
25 *	flush_user_cache_all()
26 *
27 *	Invalidate all cache entries in a particular address
28 *	space.
29 *
30 *	- mm	- mm_struct describing address space
31 */
32ENTRY(v4_flush_user_cache_all)
33	/* FALLTHROUGH */
34/*
35 *	flush_kern_cache_all()
36 *
37 *	Clean and invalidate the entire cache.
38 */
39ENTRY(v4_flush_kern_cache_all)
40#ifdef CONFIG_CPU_CP15
41	mov	r0, #0
42	mcr	p15, 0, r0, c7, c7, 0		@ flush ID cache
43	mov	pc, lr
44#else
45	/* FALLTHROUGH */
46#endif
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 */
58ENTRY(v4_flush_user_cache_range)
59#ifdef CONFIG_CPU_CP15
60	mov	ip, #0
61	mcreq	p15, 0, ip, c7, c7, 0		@ flush ID cache
62	mov	pc, lr
63#else
64	/* FALLTHROUGH */
65#endif
66
67/*
68 *	coherent_kern_range(start, end)
69 *
70 *	Ensure coherency between the Icache and the Dcache in the
71 *	region described by start.  If you have non-snooping
72 *	Harvard caches, you need to implement this function.
73 *
74 *	- start  - virtual start address
75 *	- end	 - virtual end address
76 */
77ENTRY(v4_coherent_kern_range)
78	/* FALLTHROUGH */
79
80/*
81 *	coherent_user_range(start, end)
82 *
83 *	Ensure coherency between the Icache and the Dcache in the
84 *	region described by start.  If you have non-snooping
85 *	Harvard caches, you need to implement this function.
86 *
87 *	- start  - virtual start address
88 *	- end	 - virtual end address
89 */
90ENTRY(v4_coherent_user_range)
91	mov	r0, #0
92	mov	pc, lr
93
94/*
95 *	flush_kern_dcache_area(void *addr, size_t size)
96 *
97 *	Ensure no D cache aliasing occurs, either with itself or
98 *	the I cache
99 *
100 *	- addr	- kernel address
101 *	- size	- region size
102 */
103ENTRY(v4_flush_kern_dcache_area)
104	/* FALLTHROUGH */
105
106/*
107 *	dma_flush_range(start, end)
108 *
109 *	Clean and invalidate the specified virtual address range.
110 *
111 *	- start  - virtual start address
112 *	- end	 - virtual end address
113 */
114ENTRY(v4_dma_flush_range)
115#ifdef CONFIG_CPU_CP15
116	mov	r0, #0
117	mcr	p15, 0, r0, c7, c7, 0		@ flush ID cache
118#endif
119	mov	pc, lr
120
121/*
122 *	dma_unmap_area(start, size, dir)
123 *	- start	- kernel virtual start address
124 *	- size	- size of region
125 *	- dir	- DMA direction
126 */
127ENTRY(v4_dma_unmap_area)
128	teq	r2, #DMA_TO_DEVICE
129	bne	v4_dma_flush_range
130	/* FALLTHROUGH */
131
132/*
133 *	dma_map_area(start, size, dir)
134 *	- start	- kernel virtual start address
135 *	- size	- size of region
136 *	- dir	- DMA direction
137 */
138ENTRY(v4_dma_map_area)
139	mov	pc, lr
140ENDPROC(v4_dma_unmap_area)
141ENDPROC(v4_dma_map_area)
142
143	__INITDATA
144
145	@ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
146	define_cache_functions v4
147