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-rw-r--r--arch/um/kernel/initrd.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/um/kernel/initrd.c b/arch/um/kernel/initrd.c
new file mode 100644
index 0000000000..47b8cb1a11
--- /dev/null
+++ b/arch/um/kernel/initrd.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ */
+
+#include <linux/init.h>
+#include <linux/memblock.h>
+#include <linux/initrd.h>
+#include <asm/types.h>
+#include <init.h>
+#include <os.h>
+
+#include "um_arch.h"
+
+/* Changed by uml_initrd_setup, which is a setup */
+static char *initrd __initdata = NULL;
+
+int __init read_initrd(void)
+{
+ unsigned long long size;
+ void *area;
+
+ if (!initrd)
+ return 0;
+
+ area = uml_load_file(initrd, &size);
+ if (!area)
+ return 0;
+
+ initrd_start = (unsigned long) area;
+ initrd_end = initrd_start + size;
+ return 0;
+}
+
+static int __init uml_initrd_setup(char *line, int *add)
+{
+ initrd = line;
+ return 0;
+}
+
+__uml_setup("initrd=", uml_initrd_setup,
+"initrd=<initrd image>\n"
+" This is used to boot UML from an initrd image. The argument is the\n"
+" name of the file containing the image.\n\n"
+);