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author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 09:17:24 (GMT) |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 09:17:24 (GMT) |
commit | 250c22777fe1ccd7ac588579a6c16db4c0161cc5 (patch) | |
tree | 55c317efb7d792ec6fdae1d1937c67a502c48dec /arch/x86/kernel/crash_dump_64.c | |
parent | 2db55d344e529492545cb3b755c7e9ba8e4fa94e (diff) | |
download | linux-fsl-qoriq-250c22777fe1ccd7ac588579a6c16db4c0161cc5.tar.xz |
x86_64: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/crash_dump_64.c')
-rw-r--r-- | arch/x86/kernel/crash_dump_64.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c new file mode 100644 index 0000000..942deac --- /dev/null +++ b/arch/x86/kernel/crash_dump_64.c @@ -0,0 +1,47 @@ +/* + * kernel/crash_dump.c - 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 <asm/uaccess.h> +#include <asm/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(pfn << PAGE_SHIFT, PAGE_SIZE); + + if (userbuf) { + if (copy_to_user(buf, (vaddr + offset), csize)) { + iounmap(vaddr); + return -EFAULT; + } + } else + memcpy(buf, (vaddr + offset), csize); + + iounmap(vaddr); + return csize; +} |