Root/
Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
---|---|
1 | /* |
2 | * crash_dump.c - Memory preserving reboot related code. |
3 | * |
4 | * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) |
5 | * Copyright (C) IBM Corporation, 2004. All rights reserved |
6 | */ |
7 | #include <linux/errno.h> |
8 | #include <linux/crash_dump.h> |
9 | #include <linux/io.h> |
10 | #include <asm/uaccess.h> |
11 | |
12 | /** |
13 | * copy_oldmem_page - copy one page from "oldmem" |
14 | * @pfn: page frame number to be copied |
15 | * @buf: target memory address for the copy; this can be in kernel address |
16 | * space or user address space (see @userbuf) |
17 | * @csize: number of bytes to copy |
18 | * @offset: offset in bytes into the page (based on pfn) to begin the copy |
19 | * @userbuf: if set, @buf is in user address space, use copy_to_user(), |
20 | * otherwise @buf is in kernel address space, use memcpy(). |
21 | * |
22 | * Copy a page from "oldmem". For this page, there is no pte mapped |
23 | * in the current kernel. We stitch up a pte, similar to kmap_atomic. |
24 | */ |
25 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, |
26 | size_t csize, unsigned long offset, int userbuf) |
27 | { |
28 | void *vaddr; |
29 | |
30 | if (!csize) |
31 | return 0; |
32 | |
33 | vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); |
34 | |
35 | if (userbuf) { |
36 | if (copy_to_user(buf, (vaddr + offset), csize)) { |
37 | iounmap(vaddr); |
38 | return -EFAULT; |
39 | } |
40 | } else |
41 | memcpy(buf, (vaddr + offset), csize); |
42 | |
43 | iounmap(vaddr); |
44 | return csize; |
45 | } |
46 |
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