1 files changed, 101 insertions, 0 deletions
diff --git a/libc/arch-mips/bionic/cacheflush.c b/libc/arch-mips/bionic/cacheflush.c
new file mode 100644
index 0000000..05085b6
--- /dev/null
+++ b/libc/arch-mips/bionic/cacheflush.c
@@ -0,0 +1,101 @@
+/*
+ * 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 <logd.h>
+#define  XLOG(...)   \
+	__libc_android_log_print(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;
+}