cpufunc.h revision 87702 
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 87702 2001-12-11 23:33:44Z jhb $
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#ifdef __GNUC__
39
40static __inline void
41breakpoint(void)
42{
43
44	return;
45}
46
47#endif
48
49/* CPU register mangling inlines */
50
51static __inline void
52mtmsr(unsigned int value)
53{
54
55	__asm __volatile ("mtmsr %0" :: "r"(value));
56}
57
58static __inline unsigned int
59mfmsr(void)
60{
61	unsigned int	value;
62
63	__asm __volatile ("mfmsr %0" : "=r"(value));
64
65	return (value);
66}
67
68static __inline void
69mtdec(unsigned int value)
70{
71
72	__asm __volatile ("mtdec %0" :: "r"(value));
73}
74
75static __inline unsigned int
76mfdec(void)
77{
78	unsigned int	value;
79
80	__asm __volatile ("mfdec %0" : "=r"(value));
81
82	return (value);
83}
84
85/*
86 * Bogus interrupt manipulation
87 */
88static __inline void
89disable_intr(void)
90{
91	unsigned int	msr;
92
93	msr = mfmsr();
94	mtmsr(msr & ~PSL_EE);
95}
96
97static __inline void
98enable_intr(void)
99{
100	unsigned int	msr;
101
102	msr = mfmsr();
103	mtmsr(msr | PSL_EE);
104}
105
106static __inline unsigned int
107save_intr(void)
108{
109	unsigned int	msr;
110
111	msr = mfmsr();
112
113	return msr;
114}
115
116static __inline critical_t
117critical_enter(void)
118{
119
120	return ((critical_t)save_intr());
121}
122
123static __inline void
124restore_intr(unsigned int msr)
125{
126
127	mtmsr(msr);
128}
129
130static __inline void
131critical_exit(critical_t msr)
132{
133
134	return (restore_intr((unsigned int)msr));
135}
136
137static __inline void
138powerpc_mb(void)
139{
140
141	__asm __volatile("eieio; sync" : : : "memory");
142}
143
144static __inline struct pcpu *
145powerpc_get_pcpup(void)
146{
147	struct pcpu	*ret;
148
149	__asm ("mfsprg %0, 0" : "=r"(ret));
150
151	return(ret);
152}
153
154#endif /* _KERNEL */
155
156#endif /* !_MACHINE_CPUFUNC_H_ */
157