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authorPaul Mundt <lethal@linux-sh.org>2007-04-27 06:25:57 +0400
committerPaul Mundt <lethal@hera.kernel.org>2007-05-07 06:11:56 +0400
commit4d5ade5b29c618e97a8988efb6967cb4dd0e2183 (patch)
tree376d71458747e23e7f5171b9914b0d516cad7c7b /arch/sh/kernel/crash_dump.c
parentdb62e5bd297d1f325811c5495ad23de36db0fdd4 (diff)
downloadlinux-4d5ade5b29c618e97a8988efb6967cb4dd0e2183.tar.xz
sh: kdump support.
This adds support for kexec based crash dumps. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/crash_dump.c')
-rw-r--r--arch/sh/kernel/crash_dump.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/sh/kernel/crash_dump.c b/arch/sh/kernel/crash_dump.c
new file mode 100644
index 000000000000..4a2ecbe27d8e
--- /dev/null
+++ b/arch/sh/kernel/crash_dump.c
@@ -0,0 +1,46 @@
+/*
+ * 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 <linux/io.h>
+#include <asm/uaccess.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;
+}