Current File : //lib/modules/3.10.0-1160.88.1.el7.centos.plus.x86_64/source/arch/x86/include/asm/crash-driver.h
#ifndef _ASM_X86_CRASH_DRIVER_H
#define _ASM_X86_CRASH_DRIVER_H
/*
* linux/include/x86/crash-driver.h
*
* Copyright (c) 2004 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifdef __KERNEL__
#include <linux/mm.h>
#include <linux/highmem.h>
#include <asm/mmzone.h>
extern int page_is_ram(unsigned long);
static inline void *
map_virtual(u64 offset, struct page **pp)
{
struct page *page;
unsigned long pfn;
void *vaddr;
pfn = (unsigned long)(offset >> PAGE_SHIFT);
if (!page_is_ram(pfn)) {
printk(KERN_INFO
"crash memory driver: !page_is_ram(pfn: %lx)\n", pfn);
return NULL;
}
if (!pfn_valid(pfn)) {
printk(KERN_INFO
"crash memory driver: invalid pfn: %lx )\n", pfn);
return NULL;
}
page = pfn_to_page(pfn);
vaddr = kmap(page);
if (!vaddr) {
printk(KERN_INFO
"crash memory driver: pfn: %lx kmap(page: %lx) failed\n",
pfn, (unsigned long)page);
return NULL;
}
*pp = page;
return (vaddr + (offset & (PAGE_SIZE-1)));
}
static inline void unmap_virtual(struct page *page)
{
kunmap(page);
}
#endif /* __KERNEL__ */
#endif /* _ASM_X86_CRASH_DRIVER_H */
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