1/*
2 * Copyright 2011, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef FLUSH_CPU_CACHE_H
18#define FLUSH_CPU_CACHE_H
19
20#if defined(__arm__) || defined(__mips__)
21
22// Note: Though we wish to use the gcc builtin function __clear_cache to
23// invalidate the instruction cache; however, the toolchain of Android
24// has not supported it properly.  We are going to use cacheflush system
25// call to invalidate the instruction cache.
26//
27// As a side note, Dalvik VM use the same system call to invalidate the
28// instruction as well.
29
30#include <unistd.h>
31
32#define FLUSH_CPU_CACHE(BEGIN, END) \
33  cacheflush(((long)(BEGIN)), ((long)(END)), 0)
34
35#if 0 && defined(__mips__)
36
37// Note: Following code does not work with Android Toolchain, though they
38// works while using standalone mips-linux-gnu-gcc.
39
40#include <sys/cachectl.h>
41#define FLUSH_CPU_CACHE(BEGIN, END) \
42  _flush_cache(reinterpret_cast<char*>(BEGIN), END-BEGIN+1, BCACHE);
43
44#endif
45
46#else
47
48#define FLUSH_CPU_CACHE(BEGIN, END) do { } while (0)
49
50#endif
51
52#endif // FLUSH_CPU_CACHE_H
53