1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 */
30 /*
31 * This file is part of Lustre, http://www.lustre.org/
32 * Lustre is a trademark of Sun Microsystems, Inc.
33 */
34
35 #ifndef __LNET_LINUX_LIB_LNET_H__
36 #define __LNET_LINUX_LIB_LNET_H__
37
38 #ifndef __LNET_LIB_LNET_H__
39 #error Do not #include this file directly. #include <linux/lnet/lib-lnet.h> instead
40 #endif
41
42 # include <asm/page.h>
43 # include <linux/string.h>
44 # include <asm/io.h>
45 #include "../../libcfs/libcfs.h"
46
47 static inline __u64
lnet_page2phys(struct page * p)48 lnet_page2phys(struct page *p)
49 {
50 /* compiler optimizer will elide unused branches */
51
52 switch (sizeof(typeof(page_to_phys(p)))) {
53 case 4:
54 /* page_to_phys returns a 32 bit physical address. This must
55 * be a 32 bit machine with <= 4G memory and we must ensure we
56 * don't sign extend when converting to 64 bits. */
57 return (unsigned long)page_to_phys(p);
58
59 case 8:
60 /* page_to_phys returns a 64 bit physical address :) */
61 return page_to_phys(p);
62
63 default:
64 LBUG();
65 return 0;
66 }
67 }
68
69 #define LNET_ROUTER
70
71 #endif /* __LNET_LINUX_LIB_LNET_H__ */
72