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// SPDX-License-Identifier: GPL-2.0
/*
* This code comes from arch/arm64/kernel/crash_dump.c
* Created by: AKASHI Takahiro <takahiro.akashi@linaro.org>
* Copyright (C) 2017 Linaro Limited
*/
#include <linux/crash_dump.h>
#include <linux/io.h>
#include <linux/uio.h>
ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
size_t csize, unsigned long offset)
{
void *vaddr;
if (!csize)
return 0;
vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB);
if (!vaddr)
return -ENOMEM;
csize = copy_to_iter(vaddr + offset, csize, iter);
memunmap(vaddr);
return csize;
}
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