]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - kernel/crash_dump.c
2 * kernel/crash_dump.c - Memory preserving reboot related code.
4 * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
5 * Copyright (C) IBM Corporation, 2004. All rights reserved
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>
16 #include <asm/uaccess.h>
18 /* Stores the physical address of elf header of crash image. */
19 unsigned long long elfcorehdr_addr
= ELFCORE_ADDR_MAX
;
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.
25 ssize_t
copy_oldmem_page(unsigned long pfn
, char *buf
,
26 size_t csize
, unsigned long offset
, int userbuf
)
33 page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
37 vaddr
= kmap_atomic_pfn(pfn
, KM_PTE0
);
38 copy_page(page
, vaddr
);
39 kunmap_atomic(vaddr
, KM_PTE0
);
42 if (copy_to_user(buf
, (page
+ offset
), csize
)) {
47 memcpy(buf
, (page
+ offset
), csize
);