75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
#ifndef _ASM_X86_64_CRASH_H
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#define _ASM_X86_64_CRASH_H
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/*
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* linux/include/asm-x86_64/crash.h
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*
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* Copyright (c) 2004 Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifdef __KERNEL__
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <asm/mmzone.h>
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extern int page_is_ram(unsigned long);
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static inline void *
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map_virtual(u64 offset, struct page **pp)
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{
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struct page *page;
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unsigned long pfn;
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void *vaddr;
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pfn = (unsigned long)(offset >> PAGE_SHIFT);
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if (!page_is_ram(pfn)) {
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printk(KERN_INFO
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"crash memory driver: !page_is_ram(pfn: %lx)\n", pfn);
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return NULL;
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}
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if (!pfn_valid(pfn)) {
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printk(KERN_INFO
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"crash memory driver: invalid pfn: %lx )\n", pfn);
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return NULL;
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}
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page = pfn_to_page(pfn);
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vaddr = kmap(page);
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if (!vaddr) {
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printk(KERN_INFO
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"crash memory driver: pfn: %lx kmap(page: %lx) failed\n",
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pfn, (unsigned long)page);
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return NULL;
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}
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*pp = page;
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return (vaddr + (offset & (PAGE_SIZE-1)));
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}
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static inline void unmap_virtual(struct page *page)
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{
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kunmap(page);
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_64_CRASH_H */
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