cpufunc.h revision 78342 
1/*-
2 * Copyright (c) 1998 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/powerpc/include/cpufunc.h 78342 2001-06-16 07:14:07Z benno $
27 */
28
29#ifndef _MACHINE_CPUFUNC_H_
30#define	_MACHINE_CPUFUNC_H_
31
32#ifdef _KERNEL
33
34#include <sys/types.h>
35
36#ifdef __GNUC__
37
38static __inline void
39breakpoint(void)
40{
41	return;
42}
43
44#endif
45
46/*
47 * Bogus interrupt manipulation
48 */
49static __inline void
50disable_intr(void)
51{
52	u_int32_t	msr;
53
54	msr = 0;
55	__asm __volatile(
56		"mfmsr %0\n\t"
57		"rlwinm %0, %0, 0, 17, 15\n\t"
58		"mtmsr %0"
59		: "+r" (msr));
60
61	return;
62}
63
64static __inline void
65enable_intr(void)
66{
67	u_int32_t	msr;
68
69	msr = 0;
70	__asm __volatile(
71		"mfmsr %0\n\t"
72		"ori %0, %0, 0x8000\n\t"
73		"mtmsr %0"
74		: "+r" (msr));
75
76	return;
77}
78
79static __inline u_int
80save_intr(void)
81{
82	u_int	msr;
83
84	__asm __volatile("mfmsr %0" : "=r" (msr));
85
86	return msr;
87}
88
89static __inline critical_t
90critical_enter(void)
91{
92	return ((critical_t)save_intr());
93}
94
95static __inline void
96restore_intr(u_int msr)
97{
98	__asm __volatile("mtmsr %0" : : "r" (msr));
99
100	return;
101}
102
103static __inline void
104critical_exit(critical_t msr)
105{
106	return (restore_intr((u_int)msr));
107}
108
109static __inline void
110powerpc_mb(void)
111{
112	__asm __volatile("eieio;" : : : "memory");
113}
114
115static __inline void
116*powerpc_get_globalp(void)
117{
118	void *ret;
119
120	__asm __volatile("mfsprg %0, 0" : "=r" (ret));
121
122	return(ret);
123}
124
125#endif /* _KERNEL */
126
127#endif /* !_MACHINE_CPUFUNC_H_ */
128