2 * 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/errno.h>
9 #include <linux/crash_dump.h>
10 #include <linux/uaccess.h>
13 /* Stores the physical address of elf header of crash image. */
14 unsigned long long elfcorehdr_addr
= ELFCORE_ADDR_MAX
;
17 * copy_oldmem_page - copy one page from "oldmem"
18 * @pfn: page frame number to be copied
19 * @buf: target memory address for the copy; this can be in kernel address
20 * space or user address space (see @userbuf)
21 * @csize: number of bytes to copy
22 * @offset: offset in bytes into the page (based on pfn) to begin the copy
23 * @userbuf: if set, @buf is in user address space, use copy_to_user(),
24 * otherwise @buf is in kernel address space, use memcpy().
26 * Copy a page from "oldmem". For this page, there is no pte mapped
27 * in the current kernel. We stitch up a pte, similar to kmap_atomic.
29 ssize_t
copy_oldmem_page(unsigned long pfn
, char *buf
,
30 size_t csize
, unsigned long offset
, int userbuf
)
37 vaddr
= ioremap_cache(pfn
<< PAGE_SHIFT
, PAGE_SIZE
);
42 if (copy_to_user(buf
, vaddr
+ offset
, csize
)) {
47 memcpy(buf
, vaddr
+ offset
, csize
);
49 set_iounmap_nonlazy();
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