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| 3 | * crash_dump.c - Memory preserving reboot related code.
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| 4 | *
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| 5 | * Created by: Hariprasad Nellitheertha ([email protected])
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| 6 | * Copyright (C) IBM Corporation, 2004. All rights reserved
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| 7 |
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| 8 | #include <linux/errno.h>
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| 9 | #include <linux/crash_dump.h>
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| 10 | #include <linux/io.h>
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| 11 | #include <linux/uio.h>
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| 12 | #include <linux/uaccess.h>
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| 13 |
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| 14 | ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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| 15 | size_t csize, unsigned long offset)
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| 16 | {
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| 17 | void __iomem *vaddr;
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| 18 |
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| 19 | if (!csize)
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| 20 | return 0;
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| 21 |
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| 22 | vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
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| 23 | csize = copy_to_iter(vaddr + offset, csize, iter);
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| 24 | iounmap(vaddr);
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| 25 |
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| 26 | return csize;
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| 27 | }
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