1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arch/arm/kernel/crash_dump.c
4 *
5 * Copyright (C) 2010 Nokia Corporation.
6 * Author: Mika Westerberg
7 *
8 * This code is taken from arch/x86/kernel/crash_dump_64.c
9 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
10 * Copyright (C) IBM Corporation, 2004. All rights reserved
11 */
12
13 #include <linux/errno.h>
14 #include <linux/crash_dump.h>
15 #include <linux/uaccess.h>
16 #include <linux/io.h>
17 #include <linux/uio.h>
18
19 ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
20 size_t csize, unsigned long offset)
21 {
22 void *vaddr;
23
24 if (!csize)
25 return 0;
26
27 vaddr = ioremap(__pfn_to_phys(pfn), PAGE_SIZE);
28 if (!vaddr)
29 return -ENOMEM;
30
31 csize = copy_to_iter(vaddr + offset, csize, iter);
32
33 iounmap(vaddr);
34 return csize;
35 }
36
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