405b8029a6
Change-Id: I2864dea04b3faf2d919165dcaa600af5b16c41c8 Signed-off-by: Chris Dearman <chris@mips.com> Signed-off-by: Raghu Gandham <raghu@mips.com>
101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <unistd.h>
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#include <sys/cachectl.h>
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#ifdef DEBUG
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#include <logd.h>
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#define XLOG(...) \
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__libc_android_log_print(ANDROID_LOG_DEBUG,"libc-cacheflush",__VA_ARGS__)
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#endif
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/*
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* Linux historically defines a cacheflush(3) routine for MIPS
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* with this signature:
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* int cacheflush(char *addr, int nbytes, int cache);
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*
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* Android defines an alternate cacheflush routine which exposes the
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* ARM system call interface:
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* int cacheflush (long start, long end, long flags)
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*
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* This is an attempt to maintain compatibility between the historical MIPS
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* usage for software previously ported to MIPS and Android specific
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* uses of cacheflush()
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*
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* Use the gcc __clear_cache builtin if possible. This will generate inline synci
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* instructions if available or call _flush_cache(start, len, BCACHE) directly
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*/
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#if defined (__GNUC__)
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#define GCC_VERSION ((__GNUC__*10000) + __GNUC_MINOR__*100 + __GNUC_PATCHLEVEL__)
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#endif
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/* This is the Android signature */
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int cacheflush (long start, long end, long flags)
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{
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if (end < start) {
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/*
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* It looks like this is really MIPS style cacheflush call
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* start => addr
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* end => nbytes
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*/
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#ifdef DEBUG
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static int warned = 0;
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if (!warned) {
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XLOG("called with (start,len) instead of (start,end)");
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warned = 1;
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}
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#endif
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end += start;
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}
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#if !defined(ARCH_MIPS_USE_FLUSHCACHE_SYSCALL) && \
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defined(GCC_VERSION) && (GCC_VERSION >= 40300)
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#if (__mips_isa_rev >= 2) && (GCC_VERSION < 40403)
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/*
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* Modify "start" and "end" to avoid GCC 4.3.0-4.4.2 bug in
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* mips_expand_synci_loop that may execute synci one more time.
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* "start" points to the first byte of the cache line.
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* "end" points to the last byte of the line before the last cache line.
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* Because size is always a multiple of 4, this is safe to set
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* "end" to the last byte.
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*/
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{
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int lineSize;
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asm("rdhwr %0, $1" : "=r" (lineSize));
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start = start & (-lineSize);
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end = (end & (-lineSize)) - 1;
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}
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#endif
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__builtin___clear_cache((char *)start, (char *)end);
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#else
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_flush_cache((char *)start, end-start, BCACHE);
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#endif
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return 0;
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}
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