Root/
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 | } |
61 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9