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 (643B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *	crash_dump.c - Memory preserving reboot related code.
      4 *
      5 *	Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
      6 *	Copyright (C) IBM Corporation, 2004. All rights reserved
      7 */
      8#include <linux/errno.h>
      9#include <linux/crash_dump.h>
     10#include <linux/io.h>
     11#include <linux/uio.h>
     12#include <linux/uaccess.h>
     13
     14ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
     15			 size_t csize, unsigned long offset)
     16{
     17	void  __iomem *vaddr;
     18
     19	if (!csize)
     20		return 0;
     21
     22	vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
     23	csize = copy_to_iter(vaddr + offset, csize, iter);
     24	iounmap(vaddr);
     25
     26	return csize;
     27}