1 files changed, 38 insertions, 0 deletions

diff --git a/tests/vm/mmap-shuffle.c b/tests/vm/mmap-shuffle.c
new file mode 100644
index 0000000..29921ad
--- /dev/null
+++ b/tests/vm/mmap-shuffle.c
@@ -0,0 +1,38 @@
+/* Creates a 128 kB file and repeatedly shuffles data in it
+   through a memory mapping. */
+
+#include <stdio.h>
+#include <string.h>
+#include <syscall.h>
+#include "tests/arc4.h"
+#include "tests/cksum.h"
+#include "tests/lib.h"
+#include "tests/main.h"
+
+#define SIZE (128 * 1024)
+
+static char *buf = (char *) 0x10000000;
+
+void
+test_main (void)
+{
+  size_t i;
+  int handle;
+
+  /* Create file, mmap. */
+  CHECK (create ("buffer", SIZE), "create \"buffer\"");
+  CHECK ((handle = open ("buffer")) > 1, "open \"buffer\"");
+  CHECK (mmap (handle, buf) != MAP_FAILED, "mmap \"buffer\"");
+
+  /* Initialize. */
+  for (i = 0; i < SIZE; i++)
+    buf[i] = i * 257;
+  msg ("init: cksum=%lu", cksum (buf, SIZE));
+    
+  /* Shuffle repeatedly. */
+  for (i = 0; i < 10; i++)
+    {
+      shuffle (buf, SIZE, 1);
+      msg ("shuffle %zu: cksum=%lu", i, cksum (buf, SIZE));
+    }
+}