diff options
Diffstat (limited to 'kernel/arch/x86/kernel/crash_dump_64.c')
-rw-r--r-- | kernel/arch/x86/kernel/crash_dump_64.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/kernel/arch/x86/kernel/crash_dump_64.c b/kernel/arch/x86/kernel/crash_dump_64.c new file mode 100644 index 000000000..afa64adb7 --- /dev/null +++ b/kernel/arch/x86/kernel/crash_dump_64.c @@ -0,0 +1,49 @@ +/* + * Memory preserving reboot related code. + * + * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) + * Copyright (C) IBM Corporation, 2004. All rights reserved + */ + +#include <linux/errno.h> +#include <linux/crash_dump.h> +#include <linux/uaccess.h> +#include <linux/io.h> + +/** + * copy_oldmem_page - copy one page from "oldmem" + * @pfn: page frame number to be copied + * @buf: target memory address for the copy; this can be in kernel address + * space or user address space (see @userbuf) + * @csize: number of bytes to copy + * @offset: offset in bytes into the page (based on pfn) to begin the copy + * @userbuf: if set, @buf is in user address space, use copy_to_user(), + * otherwise @buf is in kernel address space, use memcpy(). + * + * Copy a page from "oldmem". For this page, there is no pte mapped + * in the current kernel. We stitch up a pte, similar to kmap_atomic. + */ +ssize_t copy_oldmem_page(unsigned long pfn, char *buf, + size_t csize, unsigned long offset, int userbuf) +{ + void *vaddr; + + if (!csize) + return 0; + + vaddr = ioremap_cache(pfn << PAGE_SHIFT, PAGE_SIZE); + if (!vaddr) + return -ENOMEM; + + if (userbuf) { + if (copy_to_user(buf, vaddr + offset, csize)) { + iounmap(vaddr); + return -EFAULT; + } + } else + memcpy(buf, vaddr + offset, csize); + + set_iounmap_nonlazy(); + iounmap(vaddr); + return csize; +} |