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(addr: vaddr + offset, bytes: csize, i: iter); |
32 | |
33 | iounmap(addr: vaddr); |
34 | return csize; |
35 | } |
36 |