1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <unistd.h> 30 #include <sys/cachectl.h> 31 32 #include <async_safe/log.h> 33 34 // Linux historically defines a cacheflush(3) routine for MIPS 35 // with this signature: 36 37 // int cacheflush(char *addr, int nbytes, int cache); 38 39 // Android defines an alternate cacheflush routine which exposes the 40 // ARM system call interface: 41 42 // int cacheflush (long start, long end, long flags) 43 44 // This is an attempt to maintain compatibility between the historical MIPS 45 // usage for software previously ported to MIPS and Android specific 46 // uses of cacheflush(). 47 48 int cacheflush(long start, long end, long /*flags*/) { 49 if (end < start) { 50 // It looks like this is really a MIPS-style cacheflush call. 51 static bool warned = false; 52 if (!warned) { 53 async_safe_format_log(ANDROID_LOG_WARN, "libc", 54 "cacheflush called with (start,len) instead of (start,end)"); 55 warned = true; 56 } 57 end += start; 58 } 59 60 // Use the GCC builtin. This will generate inline synci instructions if available, 61 // or call _flush_cache(start, len, BCACHE) directly. 62 __builtin___clear_cache(reinterpret_cast<char*>(start), reinterpret_cast<char*>(end)); 63 return 0; 64 } 65
