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// SPDX-License-Identifier: GPL-2.0
/*
* 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 <linux/uio.h>
#include <linux/uaccess.h>
ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
size_t csize, unsigned long offset)
{
void __iomem *vaddr;
if (!csize)
return 0;
vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
csize = copy_to_iter(vaddr + offset, csize, iter);
iounmap(vaddr);
return csize;
}
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