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| 3 | * arch/arm/kernel/crash_dump.c
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| 4 | *
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| 5 | * Copyright (C) 2010 Nokia Corporation.
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| 6 | * Author: Mika Westerberg
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| 7 | *
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| 8 | * This code is taken from arch/x86/kernel/crash_dump_64.c
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| 9 | * Created by: Hariprasad Nellitheertha ([email protected])
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| 10 | * Copyright (C) IBM Corporation, 2004. All rights reserved
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| 11 |
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| 12 |
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| 13 | #include <linux/errno.h>
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| 14 | #include <linux/crash_dump.h>
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| 15 | #include <linux/uaccess.h>
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| 16 | #include <linux/io.h>
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| 17 | #include <linux/uio.h>
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| 18 |
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| 19 | ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
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| 20 | size_t csize, unsigned long offset)
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| 21 | {
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| 22 | void *vaddr;
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| 23 |
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| 24 | if (!csize)
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| 25 | return 0;
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| 26 |
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| 27 | vaddr = ioremap(__pfn_to_phys(pfn), PAGE_SIZE);
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| 28 | if (!vaddr)
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| 29 | return -ENOMEM;
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| 30 |
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| 31 | csize = copy_to_iter(vaddr + offset, csize, iter);
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| 32 |
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| 33 | iounmap(vaddr);
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| 34 | return csize;
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| 35 | }
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