2 * Copyright (C) 2004-2006 Atmel Corporation
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.
9 #include <linux/highmem.h>
10 #include <linux/unistd.h>
12 #include <asm/cacheflush.h>
13 #include <asm/cachectl.h>
14 #include <asm/processor.h>
15 #include <asm/uaccess.h>
18 * If you attempt to flush anything more than this, you need superuser
19 * privileges. The value is completely arbitrary.
21 #define CACHEFLUSH_MAX_LEN 1024
23 void invalidate_dcache_region(void *start
, size_t size
)
25 unsigned long v
, begin
, end
, linesz
, mask
;
28 linesz
= boot_cpu_data
.dcache
.linesz
;
31 /* when first and/or last cachelines are shared, flush them
32 * instead of invalidating ... never discard valid data!
34 begin
= (unsigned long)start
;
35 end
= begin
+ size
- 1;
38 flush_dcache_line(start
);
42 if ((end
& mask
) != mask
) {
43 flush_dcache_line((void *)end
);
48 /* remaining cachelines only need invalidation */
49 for (v
= begin
; v
<= end
; v
+= linesz
)
50 invalidate_dcache_line((void *)v
);
55 void clean_dcache_region(void *start
, size_t size
)
57 unsigned long v
, begin
, end
, linesz
;
59 linesz
= boot_cpu_data
.dcache
.linesz
;
60 begin
= (unsigned long)start
& ~(linesz
- 1);
61 end
= ((unsigned long)start
+ size
+ linesz
- 1) & ~(linesz
- 1);
63 for (v
= begin
; v
< end
; v
+= linesz
)
64 clean_dcache_line((void *)v
);
68 void flush_dcache_region(void *start
, size_t size
)
70 unsigned long v
, begin
, end
, linesz
;
72 linesz
= boot_cpu_data
.dcache
.linesz
;
73 begin
= (unsigned long)start
& ~(linesz
- 1);
74 end
= ((unsigned long)start
+ size
+ linesz
- 1) & ~(linesz
- 1);
76 for (v
= begin
; v
< end
; v
+= linesz
)
77 flush_dcache_line((void *)v
);
81 void invalidate_icache_region(void *start
, size_t size
)
83 unsigned long v
, begin
, end
, linesz
;
85 linesz
= boot_cpu_data
.icache
.linesz
;
86 begin
= (unsigned long)start
& ~(linesz
- 1);
87 end
= ((unsigned long)start
+ size
+ linesz
- 1) & ~(linesz
- 1);
89 for (v
= begin
; v
< end
; v
+= linesz
)
90 invalidate_icache_line((void *)v
);
93 static inline void __flush_icache_range(unsigned long start
, unsigned long end
)
95 unsigned long v
, linesz
;
97 linesz
= boot_cpu_data
.dcache
.linesz
;
98 for (v
= start
; v
< end
; v
+= linesz
) {
99 clean_dcache_line((void *)v
);
100 invalidate_icache_line((void *)v
);
103 flush_write_buffer();
107 * This one is called after a module has been loaded.
109 void flush_icache_range(unsigned long start
, unsigned long end
)
111 unsigned long linesz
;
113 linesz
= boot_cpu_data
.dcache
.linesz
;
114 __flush_icache_range(start
& ~(linesz
- 1),
115 (end
+ linesz
- 1) & ~(linesz
- 1));
119 * This one is called from do_no_page(), do_swap_page() and install_page().
121 void flush_icache_page(struct vm_area_struct
*vma
, struct page
*page
)
123 if (vma
->vm_flags
& VM_EXEC
) {
124 void *v
= kmap(page
);
125 __flush_icache_range((unsigned long)v
, (unsigned long)v
+ PAGE_SIZE
);
131 * This one is used by copy_to_user_page()
133 void flush_icache_user_range(struct vm_area_struct
*vma
, struct page
*page
,
134 unsigned long addr
, int len
)
136 if (vma
->vm_flags
& VM_EXEC
)
137 flush_icache_range(addr
, addr
+ len
);
140 asmlinkage
int sys_cacheflush(int operation
, void __user
*addr
, size_t len
)
144 if (len
> CACHEFLUSH_MAX_LEN
) {
146 if (!capable(CAP_SYS_ADMIN
))
151 if (!access_ok(VERIFY_WRITE
, addr
, len
))
156 flush_icache_range((unsigned long)addr
,
157 (unsigned long)addr
+ len
);