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Diffstat (limited to 'arch/um/kernel/dtb.c')
-rw-r--r--arch/um/kernel/dtb.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/um/kernel/dtb.c b/arch/um/kernel/dtb.c
new file mode 100644
index 000000000000..ca69d72025f3
--- /dev/null
+++ b/arch/um/kernel/dtb.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/init.h>
+#include <linux/of_fdt.h>
+#include <linux/printk.h>
+#include <linux/memblock.h>
+#include <init.h>
+
+#include "um_arch.h"
+
+static char *dtb __initdata;
+
+void uml_dtb_init(void)
+{
+ long long size;
+ void *area;
+
+ area = uml_load_file(dtb, &size);
+ if (!area)
+ return;
+
+ if (!early_init_dt_scan(area)) {
+ pr_err("invalid DTB %s\n", dtb);
+ memblock_free(area, size);
+ return;
+ }
+
+ unflatten_device_tree();
+ early_init_fdt_scan_reserved_mem();
+}
+
+static int __init uml_dtb_setup(char *line, int *add)
+{
+ dtb = line;
+ return 0;
+}
+
+__uml_setup("dtb=", uml_dtb_setup,
+"dtb=<file>\n"
+" Boot the kernel with the devicetree blob from the specified file.\n"
+);