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 (646B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *	kernel/crash_dump.c - Memory preserving reboot related code.
      4 *
      5 *	Created by: Simon Horman <horms@verge.net.au>
      6 *	Original code moved from kernel/crash.c
      7 *	Original code comment copied from the i386 version of this file
      8 */
      9
     10#include <linux/errno.h>
     11#include <linux/types.h>
     12#include <linux/crash_dump.h>
     13#include <linux/uio.h>
     14#include <asm/page.h>
     15
     16ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
     17		size_t csize, unsigned long offset)
     18{
     19	void  *vaddr;
     20
     21	if (!csize)
     22		return 0;
     23	vaddr = __va(pfn<<PAGE_SHIFT);
     24	csize = copy_to_iter(vaddr + offset, csize, iter);
     25	return csize;
     26}
     27