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/*
* 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>
#ifdef DEBUG
#include "private/libc_logging.h"
#define XLOG(...) __libc_format_log(ANDROID_LOG_DEBUG,"libc-cacheflush",__VA_ARGS__)
#endif
/*
* 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()
*
* Use the gcc __clear_cache builtin if possible. This will generate inline synci
* instructions if available or call _flush_cache(start, len, BCACHE) directly
*/
#if defined (__GNUC__)
#define GCC_VERSION ((__GNUC__*10000) + __GNUC_MINOR__*100 + __GNUC_PATCHLEVEL__)
#endif
/* This is the Android signature */
int cacheflush (long start, long end, long flags)
{
if (end < start) {
/*
* It looks like this is really MIPS style cacheflush call
* start => addr
* end => nbytes
*/
#ifdef DEBUG
static int warned = 0;
if (!warned) {
XLOG("called with (start,len) instead of (start,end)");
warned = 1;
}
#endif
end += start;
}
#if !defined(ARCH_MIPS_USE_FLUSHCACHE_SYSCALL) && \
defined(GCC_VERSION) && (GCC_VERSION >= 40300)
#if (__mips_isa_rev >= 2) && (GCC_VERSION < 40403)
/*
* Modify "start" and "end" to avoid GCC 4.3.0-4.4.2 bug in
* mips_expand_synci_loop that may execute synci one more time.
* "start" points to the first byte of the cache line.
* "end" points to the last byte of the line before the last cache line.
* Because size is always a multiple of 4, this is safe to set
* "end" to the last byte.
*/
{
int lineSize;
asm("rdhwr %0, $1" : "=r" (lineSize));
start = start & (-lineSize);
end = (end & (-lineSize)) - 1;
}
#endif
__builtin___clear_cache((char *)start, (char *)end);
#else
_flush_cache((char *)start, end-start, BCACHE);
#endif
return 0;
}
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