schulung_tools: add various demos and tools

Different tools have been used by various trainers as demos. Put
all these into master so they are available to all trainers.

ipc_pipe: ipc demo using pipes
ipc_shm: ipc demo using shared memory
libduma: source and instructions for compiling libduma
matrix: demo of good and bad cache access
mtrace: patch and infos for using mtrace with ASLR
rtex: demo of handling page faults

Signed-off-by: John Ogness <john.ogness@linutronix.de>

1 files changed, 60 insertions, 0 deletions

diff --git a/schulung_tools/rtex/main.c b/schulung_tools/rtex/main.c
new file mode 100644
index 0000000..a68baf4
--- /dev/null
+++ b/schulung_tools/rtex/main.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+extern void timestamp(const char *msg, int val);
+extern void testfunc_malloc(void);
+extern void testfunc_deepstack(void);
+extern void setup_rt(unsigned int opts);
+
+static void usage(const char *cmd)
+{
+	printf("usage: %s [opts-bitmask]\n", cmd);
+	printf("  opts-bits:\n");
+	printf("  0x01 = mallopt\n");
+	printf("  0x02 = mlockall\n");
+	printf("  0x04 = prefault-stack\n");
+	printf("  0x08 = prefault-heap\n");
+	printf("  0x10 = run tests\n");
+	printf("\n");
+	printf("  0x10 = no rt tweaks + tests\n");
+	printf("  0x1f = full rt tweaks + tests\n");
+	printf("\n");
+}
+
+int main(int argc, char *argv[])
+{
+	unsigned int i;
+
+	if (argc != 2) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	if (sscanf(argv[1], "%x", &i) != 1) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	printf("options: 0x%x\n", i);
+
+	timestamp("init", -1);
+
+	setup_rt(i);
+
+	timestamp("main setup", -1);
+
+	if (i & 0x10) {
+		for (i = 0; i < 4; i++) {
+			testfunc_malloc();
+			timestamp("testfunc_malloc", i);
+		}
+
+		for (i = 0; i < 4; i++) {
+			testfunc_deepstack();
+			timestamp("testfunc_deepstack", i);
+		}
+	}
+
+	return 0;
+}