cause a cache alias on sparc and see if that works correctly.

2 files changed, 95 insertions, 0 deletions

diff --git a/regress/sys/kern/mmap2/Makefile b/regress/sys/kern/mmap2/Makefile
new file mode 100644
index 00000000000..a3e3952faeb
--- /dev/null
+++ b/regress/sys/kern/mmap2/Makefile
@@ -0,0 +1,4 @@
+#	$OpenBSD: Makefile,v 1.1 2002/01/03 15:03:42 art Exp $
+
+PROG=	mmaptest
+.include <bsd.regress.mk>
diff --git a/regress/sys/kern/mmap2/mmaptest.c b/regress/sys/kern/mmap2/mmaptest.c
new file mode 100644
index 00000000000..408d353d47c
--- /dev/null
+++ b/regress/sys/kern/mmap2/mmaptest.c
@@ -0,0 +1,91 @@
+/*	$OpenBSD: mmaptest.c,v 1.1 2002/01/03 15:03:42 art Exp $	*/
+/*
+ * Copyright (c) 2001 Artur Grabowski <art@openbsd.org>
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 2. 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. 
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+
+/*
+ * Map the same object in two places in memory.
+ * Should cause a cache alias on sparc.
+ */
+
+#define MAGIC "The voices in my head are trying to ignore me."
+
+int
+main()
+{
+	char fname[25] = "/tmp/mmaptestXXXXXXXXXX";
+	int page_size;
+	int fd;
+	char *v1, *v2;
+
+	if ((fd = mkstemp(fname)) < 0)
+		err(1, "mkstemp");
+
+	if (remove(fname) < 0)
+		err(1, "remove");
+
+	if ((page_size = sysconf(_SC_PAGESIZE)) < 0)
+		err(1, "sysconf");
+
+	if (ftruncate(fd, 2 * page_size) < 0)
+		err(1, "ftruncate");
+
+	/* map two pages, then map the first page over the second */
+
+	v1 = mmap(NULL, 2 * page_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+	if (v1 == MAP_FAILED)
+		err(1, "mmap 1");
+
+	/* No need to unmap, mmap is supposed to do that for us if MAP_FIXED */
+
+	v2 = mmap(v1 + page_size, page_size, PROT_READ|PROT_WRITE,
+	    MAP_SHARED|MAP_FIXED, fd, 0);
+	if (v2 == MAP_FAILED)
+		err(1, "mmap 2");
+
+	memcpy(v1, MAGIC, sizeof(MAGIC));
+
+	if (memcmp(v2, MAGIC, sizeof(MAGIC)) != 0)
+		err(1, "comparsion 1 failed");
+
+	if (memcmp(v1, v2, sizeof(MAGIC)) != 0)
+		err(1, "comparsion 2 failed");
+
+	if (munmap(v1, 2 * page_size) < 0)
+		err(1, "munmap");
+
+	close(fd);
+}
+