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28 lines
605 B
28 lines
605 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* This code comes from arch/arm64/kernel/crash_dump.c |
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* Created by: AKASHI Takahiro <[email protected]> |
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* Copyright (C) 2017 Linaro Limited |
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*/ |
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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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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 *vaddr; |
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if (!csize) |
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return 0; |
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vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB); |
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if (!vaddr) |
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return -ENOMEM; |
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csize = copy_to_iter(vaddr + offset, csize, iter); |
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memunmap(vaddr); |
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return csize; |
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}
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