/* 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)
/* 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;
}