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>
16 #include <asm/syscalls.h>
19 * If you attempt to flush anything more than this, you need superuser
20 * privileges. The value is completely arbitrary.
22 #define CACHEFLUSH_MAX_LEN 1024
24 void invalidate_dcache_region(void *start, size_t size)
26 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;
38 flush_dcache_line(start);
42 flush_dcache_line((void *)end);
46 /* remaining cachelines only need invalidation */
47 for (v = begin; v < end; v += linesz)
48 invalidate_dcache_line((void *)v);
52 void clean_dcache_region(void *start, size_t size)
54 unsigned long v, begin, end, linesz;
56 linesz = boot_cpu_data.dcache.linesz;
57 begin = (unsigned long)start & ~(linesz - 1);
58 end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
60 for (v = begin; v < end; v += linesz)
61 clean_dcache_line((void *)v);
65 void flush_dcache_region(void *start, size_t size)
67 unsigned long v, begin, end, linesz;
69 linesz = boot_cpu_data.dcache.linesz;
70 begin = (unsigned long)start & ~(linesz - 1);
71 end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
73 for (v = begin; v < end; v += linesz)
74 flush_dcache_line((void *)v);
78 void invalidate_icache_region(void *start, size_t size)
80 unsigned long v, begin, end, linesz;
82 linesz = boot_cpu_data.icache.linesz;
83 begin = (unsigned long)start & ~(linesz - 1);
84 end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
86 for (v = begin; v < end; v += linesz)
87 invalidate_icache_line((void *)v);
90 static inline void __flush_icache_range(unsigned long start, unsigned long end)
92 unsigned long v, linesz;
94 linesz = boot_cpu_data.dcache.linesz;
95 for (v = start; v < end; v += linesz) {
96 clean_dcache_line((void *)v);
97 invalidate_icache_line((void *)v);
100 flush_write_buffer();
104 * This one is called after a module has been loaded.
106 void flush_icache_range(unsigned long start, unsigned long end)
108 unsigned long linesz;
110 linesz = boot_cpu_data.dcache.linesz;
111 __flush_icache_range(start & ~(linesz - 1),
112 (end + linesz - 1) & ~(linesz - 1));
114 EXPORT_SYMBOL(flush_icache_range);
117 * This one is called from __do_fault() and do_swap_page().
119 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
121 if (vma->vm_flags & VM_EXEC) {
122 void *v = page_address(page);
123 __flush_icache_range((unsigned long)v, (unsigned long)v + PAGE_SIZE);
127 asmlinkage int sys_cacheflush(int operation, void __user *addr, size_t len)
131 if (len > CACHEFLUSH_MAX_LEN) {
133 if (!capable(CAP_SYS_ADMIN))
138 if (!access_ok(VERIFY_WRITE, addr, len))
143 flush_icache_range((unsigned long)addr,
144 (unsigned long)addr + len);
155 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
156 unsigned long vaddr, void *dst, const void *src,
159 memcpy(dst, src, len);
160 if (vma->vm_flags & VM_EXEC)
161 flush_icache_range((unsigned long)dst,
162 (unsigned long)dst + len);