diff options
Diffstat (limited to 'kernel/crash_dump.c')
-rw-r--r-- | kernel/crash_dump.c | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/kernel/crash_dump.c b/kernel/crash_dump.c deleted file mode 100644 index 334c37f5218a..000000000000 --- a/kernel/crash_dump.c +++ /dev/null | |||
@@ -1,61 +0,0 @@ | |||
1 | /* | ||
2 | * kernel/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 | |||
8 | #include <linux/smp_lock.h> | ||
9 | #include <linux/errno.h> | ||
10 | #include <linux/proc_fs.h> | ||
11 | #include <linux/bootmem.h> | ||
12 | #include <linux/highmem.h> | ||
13 | #include <linux/crash_dump.h> | ||
14 | |||
15 | #include <asm/io.h> | ||
16 | #include <asm/uaccess.h> | ||
17 | |||
18 | /* Stores the physical address of elf header of crash image. */ | ||
19 | unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; | ||
20 | |||
21 | /** | ||
22 | * copy_oldmem_page - copy one page from "oldmem" | ||
23 | * @pfn: page frame number to be copied | ||
24 | * @buf: target memory address for the copy; this can be in kernel address | ||
25 | * space or user address space (see @userbuf) | ||
26 | * @csize: number of bytes to copy | ||
27 | * @offset: offset in bytes into the page (based on pfn) to begin the copy | ||
28 | * @userbuf: if set, @buf is in user address space, use copy_to_user(), | ||
29 | * otherwise @buf is in kernel address space, use memcpy(). | ||
30 | * | ||
31 | * Copy a page from "oldmem". For this page, there is no pte mapped | ||
32 | * in the current kernel. We stitch up a pte, similar to kmap_atomic. | ||
33 | */ | ||
34 | ssize_t copy_oldmem_page(unsigned long pfn, char *buf, | ||
35 | size_t csize, unsigned long offset, int userbuf) | ||
36 | { | ||
37 | void *page, *vaddr; | ||
38 | |||
39 | if (!csize) | ||
40 | return 0; | ||
41 | |||
42 | page = kmalloc(PAGE_SIZE, GFP_KERNEL); | ||
43 | if (!page) | ||
44 | return -ENOMEM; | ||
45 | |||
46 | vaddr = kmap_atomic_pfn(pfn, KM_PTE0); | ||
47 | copy_page(page, vaddr); | ||
48 | kunmap_atomic(vaddr, KM_PTE0); | ||
49 | |||
50 | if (userbuf) { | ||
51 | if (copy_to_user(buf, (page + offset), csize)) { | ||
52 | kfree(page); | ||
53 | return -EFAULT; | ||
54 | } | ||
55 | } else { | ||
56 | memcpy(buf, (page + offset), csize); | ||
57 | } | ||
58 | |||
59 | kfree(page); | ||
60 | return csize; | ||
61 | } | ||