1 /*
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
9 #include <linux/highmem.h>
10 #include <linux/unistd.h>
11
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>
17
18 /*
19 * If you attempt to flush anything more than this, you need superuser
20 * privileges. The value is completely arbitrary.
21 */
22 #define CACHEFLUSH_MAX_LEN 1024
23
invalidate_dcache_region(void * start,size_t size)24 void invalidate_dcache_region(void *start, size_t size)
25 {
26 unsigned long v, begin, end, linesz, mask;
27
28 linesz = boot_cpu_data.dcache.linesz;
29 mask = linesz - 1;
30
31 /* when first and/or last cachelines are shared, flush them
32 * instead of invalidating ... never discard valid data!
33 */
34 begin = (unsigned long)start;
35 end = begin + size;
36
37 if (begin & mask) {
38 flush_dcache_line(start);
39 begin += linesz;
40 }
41 if (end & mask) {
42 flush_dcache_line((void *)end);
43 end &= ~mask;
44 }
45
46 /* remaining cachelines only need invalidation */
47 for (v = begin; v < end; v += linesz)
48 invalidate_dcache_line((void *)v);
49 flush_write_buffer();
50 }
51
clean_dcache_region(void * start,size_t size)52 void clean_dcache_region(void *start, size_t size)
53 {
54 unsigned long v, begin, end, linesz;
55
56 linesz = boot_cpu_data.dcache.linesz;
57 begin = (unsigned long)start & ~(linesz - 1);
58 end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
59
60 for (v = begin; v < end; v += linesz)
61 clean_dcache_line((void *)v);
62 flush_write_buffer();
63 }
64
flush_dcache_region(void * start,size_t size)65 void flush_dcache_region(void *start, size_t size)
66 {
67 unsigned long v, begin, end, linesz;
68
69 linesz = boot_cpu_data.dcache.linesz;
70 begin = (unsigned long)start & ~(linesz - 1);
71 end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
72
73 for (v = begin; v < end; v += linesz)
74 flush_dcache_line((void *)v);
75 flush_write_buffer();
76 }
77
invalidate_icache_region(void * start,size_t size)78 void invalidate_icache_region(void *start, size_t size)
79 {
80 unsigned long v, begin, end, linesz;
81
82 linesz = boot_cpu_data.icache.linesz;
83 begin = (unsigned long)start & ~(linesz - 1);
84 end = ((unsigned long)start + size + linesz - 1) & ~(linesz - 1);
85
86 for (v = begin; v < end; v += linesz)
87 invalidate_icache_line((void *)v);
88 }
89
__flush_icache_range(unsigned long start,unsigned long end)90 static inline void __flush_icache_range(unsigned long start, unsigned long end)
91 {
92 unsigned long v, linesz;
93
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);
98 }
99
100 flush_write_buffer();
101 }
102
103 /*
104 * This one is called after a module has been loaded.
105 */
flush_icache_range(unsigned long start,unsigned long end)106 void flush_icache_range(unsigned long start, unsigned long end)
107 {
108 unsigned long linesz;
109
110 linesz = boot_cpu_data.dcache.linesz;
111 __flush_icache_range(start & ~(linesz - 1),
112 (end + linesz - 1) & ~(linesz - 1));
113 }
114 EXPORT_SYMBOL(flush_icache_range);
115
116 /*
117 * This one is called from __do_fault() and do_swap_page().
118 */
flush_icache_page(struct vm_area_struct * vma,struct page * page)119 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
120 {
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);
124 }
125 }
126
sys_cacheflush(int operation,void __user * addr,size_t len)127 asmlinkage int sys_cacheflush(int operation, void __user *addr, size_t len)
128 {
129 int ret;
130
131 if (len > CACHEFLUSH_MAX_LEN) {
132 ret = -EPERM;
133 if (!capable(CAP_SYS_ADMIN))
134 goto out;
135 }
136
137 ret = -EFAULT;
138 if (!access_ok(VERIFY_WRITE, addr, len))
139 goto out;
140
141 switch (operation) {
142 case CACHE_IFLUSH:
143 flush_icache_range((unsigned long)addr,
144 (unsigned long)addr + len);
145 ret = 0;
146 break;
147 default:
148 ret = -EINVAL;
149 }
150
151 out:
152 return ret;
153 }
154
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long vaddr,void * dst,const void * src,unsigned long len)155 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
156 unsigned long vaddr, void *dst, const void *src,
157 unsigned long len)
158 {
159 memcpy(dst, src, len);
160 if (vma->vm_flags & VM_EXEC)
161 flush_icache_range((unsigned long)dst,
162 (unsigned long)dst + len);
163 }
164