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Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -07001/*
2 * Copyright (C) 2004-2006 Atmel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#ifndef __ASM_AVR32_CACHEFLUSH_H
9#define __ASM_AVR32_CACHEFLUSH_H
10
11/* Keep includes the same across arches. */
12#include <linux/mm.h>
13
14#define CACHE_OP_ICACHE_INVALIDATE 0x01
15#define CACHE_OP_DCACHE_INVALIDATE 0x0b
16#define CACHE_OP_DCACHE_CLEAN 0x0c
17#define CACHE_OP_DCACHE_CLEAN_INVAL 0x0d
18
19/*
20 * Invalidate any cacheline containing virtual address vaddr without
21 * writing anything back to memory.
22 *
23 * Note that this function may corrupt unrelated data structures when
24 * applied on buffers that are not cacheline aligned in both ends.
25 */
26static inline void invalidate_dcache_line(void *vaddr)
27{
28 asm volatile("cache %0[0], %1"
29 :
30 : "r"(vaddr), "n"(CACHE_OP_DCACHE_INVALIDATE)
31 : "memory");
32}
33
34/*
35 * Make sure any cacheline containing virtual address vaddr is written
36 * to memory.
37 */
38static inline void clean_dcache_line(void *vaddr)
39{
40 asm volatile("cache %0[0], %1"
41 :
42 : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN)
43 : "memory");
44}
45
46/*
47 * Make sure any cacheline containing virtual address vaddr is written
48 * to memory and then invalidate it.
49 */
50static inline void flush_dcache_line(void *vaddr)
51{
52 asm volatile("cache %0[0], %1"
53 :
54 : "r"(vaddr), "n"(CACHE_OP_DCACHE_CLEAN_INVAL)
55 : "memory");
56}
57
58/*
59 * Invalidate any instruction cacheline containing virtual address
60 * vaddr.
61 */
62static inline void invalidate_icache_line(void *vaddr)
63{
64 asm volatile("cache %0[0], %1"
65 :
66 : "r"(vaddr), "n"(CACHE_OP_ICACHE_INVALIDATE)
67 : "memory");
68}
69
70/*
71 * Applies the above functions on all lines that are touched by the
72 * specified virtual address range.
73 */
74void invalidate_dcache_region(void *start, size_t len);
75void clean_dcache_region(void *start, size_t len);
76void flush_dcache_region(void *start, size_t len);
77void invalidate_icache_region(void *start, size_t len);
78
79/*
80 * Make sure any pending writes are completed before continuing.
81 */
82#define flush_write_buffer() asm volatile("sync 0" : : : "memory")
83
84/*
85 * The following functions are called when a virtual mapping changes.
86 * We do not need to flush anything in this case.
87 */
88#define flush_cache_all() do { } while (0)
89#define flush_cache_mm(mm) do { } while (0)
90#define flush_cache_range(vma, start, end) do { } while (0)
91#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
92#define flush_cache_vmap(start, end) do { } while (0)
93#define flush_cache_vunmap(start, end) do { } while (0)
94
95/*
96 * I think we need to implement this one to be able to reliably
97 * execute pages from RAMDISK. However, if we implement the
98 * flush_dcache_*() functions, it might not be needed anymore.
99 *
100 * #define flush_icache_page(vma, page) do { } while (0)
101 */
102extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
103
104/*
105 * These are (I think) related to D-cache aliasing. We might need to
106 * do something here, but only for certain configurations. No such
107 * configurations exist at this time.
108 */
109#define flush_dcache_page(page) do { } while (0)
110#define flush_dcache_mmap_lock(page) do { } while (0)
111#define flush_dcache_mmap_unlock(page) do { } while (0)
112
113/*
114 * These are for I/D cache coherency. In this case, we do need to
115 * flush with all configurations.
116 */
117extern void flush_icache_range(unsigned long start, unsigned long end);
118extern void flush_icache_user_range(struct vm_area_struct *vma,
119 struct page *page,
120 unsigned long addr, int len);
121
122#define copy_to_user_page(vma, page, vaddr, dst, src, len) do { \
123 memcpy(dst, src, len); \
124 flush_icache_user_range(vma, page, vaddr, len); \
125} while(0)
126#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
127 memcpy(dst, src, len)
128
129#endif /* __ASM_AVR32_CACHEFLUSH_H */