allow reading fdt in tests

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/fdt/init.c b/tests/fdt/init.c
new file mode 100644
index 0000000..c6c35dd
--- /dev/null
+++ b/tests/fdt/init.c
@@ -0,0 +1,29 @@
+#include <common/test.h>
+#include <libfdt.h>
+
+START(pid, tid, d0, d1, d2, d3)
+{
+	UNUSED(d2);
+	UNUSED(d3);
+
+	check(pid == 0, "wrong src process ID");
+	check(tid == 1, "wrong root thread ID");
+	check(d0 == SYS_USER_SPAWNED, "wrong op");
+	printf("fdt at %lx\n", d1);
+
+	void *fdt = (void *)d1;
+
+	int chosen_offset = fdt_path_offset(fdt, "/chosen");
+	check(chosen_offset > 0, "couldn't find /chosen");
+
+	const char *stdout =
+		fdt_getprop(fdt, chosen_offset, "stdout-path", NULL);
+
+	check(stdout != NULL, "couldn't find stdout-path");
+
+	/* ideally we would also parse the stdout node and check that it is some
+	 * reasonable value, but I'm not sure if we can trust the Qemu fdt to be
+	 * stable. The above is suspicious enough I suppose */
+	printf("found stdout at: %s\n", stdout);
+	ok();
+}