28 lines
643 B
C
28 lines
643 B
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* crash_dump.c - Memory preserving reboot related code.
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*
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* Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
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* Copyright (C) IBM Corporation, 2004. All rights reserved
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*/
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#include <linux/errno.h>
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#include <linux/crash_dump.h>
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#include <linux/io.h>
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#include <linux/uio.h>
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#include <linux/uaccess.h>
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ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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size_t csize, unsigned long offset)
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{
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void __iomem *vaddr;
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if (!csize)
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return 0;
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vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
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csize = copy_to_iter(vaddr + offset, csize, iter);
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iounmap(vaddr);
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return csize;
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}
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