This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / ia64 / kernel / crash_dump.c

diff --git a/arch/ia64/kernel/crash_dump.c b/arch/ia64/kernel/crash_dump.c
new file mode 100644 (file)
index 0000000..83b8c91
--- /dev/null
+++ b/arch/ia64/kernel/crash_dump.c
@@ -0,0 +1,48 @@
+/*
+ *     kernel/crash_dump.c - Memory preserving reboot related code.
+ *
+ *     Created by: Simon Horman <horms@verge.net.au>
+ *     Original code moved from kernel/crash.c
+ *     Original code comment copied from the i386 version of this file
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+
+#include <linux/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.
+ *
+ * Calling copy_to_user() in atomic context is not desirable. Hence first
+ * copying the data to a pre-allocated kernel page and then copying to user
+ * space in non-atomic context.
+ */
+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 = __va(pfn<<PAGE_SHIFT);
+       if (userbuf) {
+               if (copy_to_user(buf, (vaddr + offset), csize)) {
+                       return -EFAULT;
+               }
+       } else
+               memcpy(buf, (vaddr + offset), csize);
+       return csize;
+}
+