cpufunc.h revision 92880 
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 92880 2002-03-21 13:07:31Z 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(register_t value)
55{
56
57	__asm __volatile ("mtmsr %0" :: "r"(value));
58}
59
60static __inline register_t
61mfmsr(void)
62{
63	register_t	value;
64
65	__asm __volatile ("mfmsr %0" : "=r"(value));
66
67	return (value);
68}
69
70static __inline void
71mtdec(register_t value)
72{
73
74	__asm __volatile ("mtdec %0" :: "r"(value));
75}
76
77static __inline register_t
78mfdec(void)
79{
80	register_t	value;
81
82	__asm __volatile ("mfdec %0" : "=r"(value));
83
84	return (value);
85}
86
87static __inline void
88isync(void)
89{
90
91	__asm __volatile ("isync");
92}
93
94static __inline register_t
95intr_disable(void)
96{
97	register_t	msr;
98
99	msr = mfmsr();
100	mtmsr(msr & ~(PSL_EE|PSL_RI));
101	return (msr);
102}
103
104static __inline void
105intr_restore(register_t msr)
106{
107
108	mtmsr(msr);
109}
110
111static __inline critical_t
112cpu_critical_enter(void)
113{
114	u_int		msr;
115	critical_t	crit;
116
117	msr = mfmsr();
118	crit = (critical_t)msr;
119	msr &= ~(PSL_EE | PSL_RI);
120	mtmsr(msr);
121
122	return (crit);
123}
124
125static __inline void
126restore_intr(unsigned int msr)
127{
128
129	mtmsr(msr);
130}
131
132static __inline void
133cpu_critical_exit(critical_t msr)
134{
135
136	mtmsr(msr);
137}
138
139static __inline void
140powerpc_mb(void)
141{
142
143	__asm __volatile("eieio; sync" : : : "memory");
144}
145
146static __inline struct pcpu *
147powerpc_get_pcpup(void)
148{
149	struct pcpu	*ret;
150
151	__asm ("mfsprg %0, 0" : "=r"(ret));
152
153	return(ret);
154}
155
156#endif /* _KERNEL */
157
158#endif /* !_MACHINE_CPUFUNC_H_ */
159