Fetch the initrd address from the DTB blob

The kernel entry has a pointer to the DTB blob as a parameter. From this
pointer we can parse the the DTB blob to find the properties
"chosen->linux,initrd-start" and "chosen->linux,initrd-start". These
properties are guaranteed to have 64-bit addresses which point where the
initrd is in memory, which we need to fetch the binaries to be loaded.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/test/test_dt.c b/test/test_dt.c
new file mode 100644
index 0000000..31f729f
--- /dev/null
+++ b/test/test_dt.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <fbos/dt.h>
+
+int main(void)
+{
+	FILE *fh = fopen("./test/testdata/qemu.dtb", "rb");
+	assert(fh);
+
+	fseek(fh, 0, SEEK_END);
+	long fsize = ftell(fh);
+	rewind(fh);
+
+	uint32_t *contents = malloc((unsigned long)fsize + 1);
+	fread(contents, (unsigned long)fsize, sizeof(uint32_t *), fh);
+	fclose(fh);
+
+	contents[fsize] = 0;
+
+	struct initrd_addr addr = find_dt_initrd_addr(contents);
+	free(contents);
+
+	assert(addr.start == 0x84200000);
+	assert(addr.end == 0x84200c00);
+
+	exit(0);
+}