| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <unistd.h> |
| #include <sys/cachectl.h> |
| |
| #include "private/libc_logging.h" |
| |
| // Linux historically defines a cacheflush(3) routine for MIPS |
| // with this signature: |
| |
| // int cacheflush(char *addr, int nbytes, int cache); |
| |
| // Android defines an alternate cacheflush routine which exposes the |
| // ARM system call interface: |
| |
| // int cacheflush (long start, long end, long flags) |
| |
| // This is an attempt to maintain compatibility between the historical MIPS |
| // usage for software previously ported to MIPS and Android specific |
| // uses of cacheflush(). |
| |
| int cacheflush(long start, long end, long /*flags*/) { |
| if (end < start) { |
| // It looks like this is really a MIPS-style cacheflush call. |
| static bool warned = false; |
| if (!warned) { |
| __libc_format_log(ANDROID_LOG_WARN, "libc", "cacheflush called with (start,len) instead of (start,end)"); |
| warned = true; |
| } |
| end += start; |
| } |
| |
| // Use the GCC builtin. This will generate inline synci instructions if available, |
| // or call _flush_cache(start, len, BCACHE) directly. |
| __builtin___clear_cache(reinterpret_cast<char*>(start), reinterpret_cast<char*>(end)); |
| return 0; |
| } |