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67742c81 MW |
1 | /* |
2 | * arch/arm/kernel/crash_dump.c | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation. | |
5 | * Author: Mika Westerberg | |
6 | * | |
7 | * This code is taken from arch/x86/kernel/crash_dump_64.c | |
8 | * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) | |
9 | * Copyright (C) IBM Corporation, 2004. All rights reserved | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/errno.h> | |
17 | #include <linux/crash_dump.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/io.h> | |
20 | ||
21 | /* stores the physical address of elf header of crash image */ | |
22 | unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; | |
23 | ||
24 | /** | |
25 | * copy_oldmem_page() - copy one page from old kernel memory | |
26 | * @pfn: page frame number to be copied | |
27 | * @buf: buffer where the copied page is placed | |
28 | * @csize: number of bytes to copy | |
29 | * @offset: offset in bytes into the page | |
30 | * @userbuf: if set, @buf is int he user address space | |
31 | * | |
32 | * This function copies one page from old kernel memory into buffer pointed by | |
33 | * @buf. If @buf is in userspace, set @userbuf to %1. Returns number of bytes | |
34 | * copied or negative error in case of failure. | |
35 | */ | |
36 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, | |
37 | size_t csize, unsigned long offset, | |
38 | int userbuf) | |
39 | { | |
40 | void *vaddr; | |
41 | ||
42 | if (!csize) | |
43 | return 0; | |
44 | ||
45 | vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); | |
46 | if (!vaddr) | |
47 | return -ENOMEM; | |
48 | ||
49 | if (userbuf) { | |
50 | if (copy_to_user(buf, vaddr + offset, csize)) { | |
51 | iounmap(vaddr); | |
52 | return -EFAULT; | |
53 | } | |
54 | } else { | |
55 | memcpy(buf, vaddr + offset, csize); | |
56 | } | |
57 | ||
58 | iounmap(vaddr); | |
59 | return csize; | |
60 | } |