cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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crash_dump.c (605B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * This code comes from arch/arm64/kernel/crash_dump.c
      4 * Created by: AKASHI Takahiro <takahiro.akashi@linaro.org>
      5 * Copyright (C) 2017 Linaro Limited
      6 */
      7
      8#include <linux/crash_dump.h>
      9#include <linux/io.h>
     10#include <linux/uio.h>
     11
     12ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
     13			 size_t csize, unsigned long offset)
     14{
     15	void *vaddr;
     16
     17	if (!csize)
     18		return 0;
     19
     20	vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB);
     21	if (!vaddr)
     22		return -ENOMEM;
     23
     24	csize = copy_to_iter(vaddr + offset, csize, iter);
     25
     26	memunmap(vaddr);
     27	return csize;
     28}