1 files changed, 27 insertions, 0 deletions
diff --git a/arch/sh/kernel/crash_dump.c b/arch/sh/kernel/crash_dump.c
new file mode 100644
index 0000000000..19ce6a950a
--- /dev/null
+++ b/arch/sh/kernel/crash_dump.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *	crash_dump.c - Memory preserving reboot related code.
+ *
+ *	Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
+ *	Copyright (C) IBM Corporation, 2004. All rights reserved
+ */
+#include <linux/errno.h>
+#include <linux/crash_dump.h>
+#include <linux/io.h>
+#include <linux/uio.h>
+#include <linux/uaccess.h>
+
+ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
+			 size_t csize, unsigned long offset)
+{
+	void  __iomem *vaddr;
+
+	if (!csize)
+		return 0;
+
+	vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+	csize = copy_to_iter(vaddr + offset, csize, iter);
+	iounmap(vaddr);
+
+	return csize;
+}