arch/x86/kernel/crash_dump_32.c

// SPDX-License-Identifier: GPL-2.0
/*
 *	Memory preserving reboot related code.
 *
 *	Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
 *	Copyright (C) IBM Corporation, 2004. All rights reserved
 */

#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/highmem.h>
#include <linux/crash_dump.h>

#include <linux/uaccess.h>

static inline bool is_crashed_pfn_valid(unsigned long pfn)
{
#ifndef CONFIG_X86_PAE
	/*
	 * non-PAE kdump kernel executed from a PAE one will crop high pte
	 * bits and poke unwanted space counting again from address 0, we
	 * don't want that. pte must fit into unsigned long. In fact the
	 * test checks high 12 bits for being zero (pfn will be shifted left
	 * by PAGE_SHIFT).
	 */
	return pte_pfn(pfn_pte(pfn, __pgprot(0))) == pfn;
#else
	return true;
#endif
}

/**
 * copy_oldmem_page - copy one page from "oldmem"
 * @pfn: page frame number to be copied
 * @buf: target memory address for the copy; this can be in kernel address
 *	space or user address space (see @userbuf)
 * @csize: number of bytes to copy
 * @offset: offset in bytes into the page (based on pfn) to begin the copy
 * @userbuf: if set, @buf is in user address space, use copy_to_user(),
 *	otherwise @buf is in kernel address space, use memcpy().
 *
 * Copy a page from "oldmem". For this page, there might be no pte mapped
 * in the current kernel.
 */
ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
			 unsigned long offset, int userbuf)
{
	void  *vaddr;

	if (!csize)
		return 0;

	if (!is_crashed_pfn_valid(pfn))
		return -EFAULT;

	vaddr = kmap_local_pfn(pfn);

	if (!userbuf) {
		memcpy(buf, vaddr + offset, csize);
	} else {
		if (copy_to_user(buf, vaddr + offset, csize))
			csize = -EFAULT;
	}

	kunmap_local(vaddr);

	return csize;
}