1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/kernel/crash_dump.c b/arch/arm/kernel/crash_dump.c
new file mode 100644
index 000000000..938bd932d
--- /dev/null
+++ b/arch/arm/kernel/crash_dump.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/arm/kernel/crash_dump.c
+ *
+ * Copyright (C) 2010 Nokia Corporation.
+ * Author: Mika Westerberg
+ *
+ * This code is taken from arch/x86/kernel/crash_dump_64.c
+ *   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/uaccess.h>
+#include <linux/io.h>
+#include <linux/uio.h>
+
+ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
+			 size_t csize, unsigned long offset)
+{
+	void *vaddr;
+
+	if (!csize)
+		return 0;
+
+	vaddr = ioremap(__pfn_to_phys(pfn), PAGE_SIZE);
+	if (!vaddr)
+		return -ENOMEM;
+
+	csize = copy_to_iter(vaddr + offset, csize, iter);
+
+	iounmap(vaddr);
+	return csize;
+}