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
19ssize_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}

 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
19ssize_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}