cpufunc.h revision 91461 
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 91461 2002-02-28 03:07:48Z 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#include <machine/psl.h>
37
38#define	CRITICAL_FORK	(mfmsr() | PSL_EE | PSL_RI)
39
40#ifdef __GNUC__
41
42static __inline void
43breakpoint(void)
44{
45
46	return;
47}
48
49#endif
50
51/* CPU register mangling inlines */
52
53static __inline void
54mtmsr(unsigned int value)
55{
56
57	__asm __volatile ("mtmsr %0" :: "r"(value));
58}
59
60static __inline unsigned int
61mfmsr(void)
62{
63	unsigned int	value;
64
65	__asm __volatile ("mfmsr %0" : "=r"(value));
66
67	return (value);
68}
69
70static __inline void
71mtdec(unsigned int value)
72{
73
74	__asm __volatile ("mtdec %0" :: "r"(value));
75}
76
77static __inline unsigned int
78mfdec(void)
79{
80	unsigned int	value;
81
82	__asm __volatile ("mfdec %0" : "=r"(value));
83
84	return (value);
85}
86
87/*
88 * Bogus interrupt manipulation
89 */
90static __inline void
91disable_intr(void)
92{
93	unsigned int	msr;
94
95	msr = mfmsr();
96	mtmsr(msr & ~(PSL_EE|PSL_RI));
97}
98
99static __inline void
100enable_intr(void)
101{
102	unsigned int	msr;
103
104	msr = mfmsr();
105	mtmsr(msr | PSL_EE | PSL_RI);
106}
107
108static __inline unsigned int
109save_intr(void)
110{
111	unsigned int	msr;
112
113	msr = mfmsr();
114
115	return msr;
116}
117
118static __inline critical_t
119cpu_critical_enter(void)
120{
121	u_int		msr;
122	critical_t	crit;
123
124	msr = mfmsr();
125	crit = (critical_t)msr;
126	msr &= ~(PSL_EE | PSL_RI);
127	mtmsr(msr);
128
129	return (crit);
130}
131
132static __inline void
133restore_intr(unsigned int msr)
134{
135
136	mtmsr(msr);
137}
138
139static __inline void
140cpu_critical_exit(critical_t msr)
141{
142
143	mtmsr(msr);
144}
145
146static __inline void
147powerpc_mb(void)
148{
149
150	__asm __volatile("eieio; sync" : : : "memory");
151}
152
153static __inline struct pcpu *
154powerpc_get_pcpup(void)
155{
156	struct pcpu	*ret;
157
158	__asm ("mfsprg %0, 0" : "=r"(ret));
159
160	return(ret);
161}
162
163#endif /* _KERNEL */
164
165#endif /* !_MACHINE_CPUFUNC_H_ */
166