intr.h revision 1.6 
1/*	$NetBSD: intr.h,v 1.6 1997/10/10 05:54:51 scottr Exp $	*/
2
3/*
4 * Copyright (C) 1997 Scott Reynolds
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#ifndef _MAC68K_INTR_H_
31#define _MAC68K_INTR_H_
32
33#ifdef _KERNEL
34/*
35 * spl functions; all but spl0 are done in-line
36 */
37
38#define _spl(s)								\
39({									\
40        register int _spl_r;						\
41									\
42        __asm __volatile ("clrl %0; movew sr,%0; movew %1,sr" :		\
43                "&=d" (_spl_r) : "di" (s));				\
44        _spl_r;								\
45})
46
47#define _splraise(s)							\
48({									\
49	int _spl_r;							\
50									\
51	__asm __volatile ("						\
52		clrl	d0					;	\
53		movw	sr,d0					;	\
54		movl	d0,%0					;	\
55		andw	#0x700,d0				;	\
56		movw	%1,d1					;	\
57		andw	#0x700,d1				;	\
58		cmpw	d0,d1					;	\
59		jle	1f					;	\
60		movw	%1,sr					;	\
61	    1:"							:	\
62		    "&=d" (_spl_r)				:	\
63		    "di" (s)					:	\
64		    "d0", "d1");					\
65	_spl_r;								\
66})
67
68/* spl0 requires checking for software interrupts */
69#define spl1()  _spl(PSL_S|PSL_IPL1)
70#define spl2()  _spl(PSL_S|PSL_IPL2)
71#define spl3()  _spl(PSL_S|PSL_IPL3)
72#define spl4()  _spl(PSL_S|PSL_IPL4)
73#define spl5()  _spl(PSL_S|PSL_IPL5)
74#define spl6()  _spl(PSL_S|PSL_IPL6)
75#define spl7()  _spl(PSL_S|PSL_IPL7)
76
77/* These spl calls are _not_ to be used by machine-independent code. */
78#define	spladb()	splhigh()
79#define	splzs()		splserial()
80#define	splsoft()	spl1()
81
82/*
83 * These should be used for:
84 * 1) ensuring mutual exclusion (why use processor level?)
85 * 2) allowing faster devices to take priority
86 *
87 * Note that on the Mac, most things are masked at spl1, almost
88 * everything at spl2, and everything but the panic switch and
89 * power at spl4.
90 */
91#define	splsoftclock()	splsoft()
92#define	splsoftnet()	splsoft()
93#define	spltty()	_splraise(PSL_S|PSL_IPL1)
94#define	splbio()	spl2()
95#define	splnet()	spl2()
96#define	splimp()	spl2()
97#define	splclock()	spl2()
98#define	splstatclock()	spl2()
99#define	splsched()	spl3()
100#define	splserial()	spl4()
101#define	splhigh()	spl7()
102
103/* watch out for side effects */
104#define splx(s)         ((s) & PSL_IPL ? _spl(s) : spl0())
105
106/*
107 * simulated software interrupt register
108 */
109extern volatile u_int8_t ssir;
110
111#define	SIR_NET		0x01
112#define	SIR_CLOCK	0x02
113#define	SIR_SERIAL	0x04
114#define SIR_DTMGR	0x08
115
116#define	siron(mask)	\
117	__asm __volatile ( "orb %0,_ssir" : : "i" (mask))
118#define	siroff(mask)	\
119	__asm __volatile ( "andb %0,_ssir" : : "ir" (~(mask)));
120
121#define	setsoftnet()	siron(SIR_NET)
122#define	setsoftclock()	siron(SIR_CLOCK)
123#define	setsoftserial()	siron(SIR_SERIAL)
124#define	setsoftdtmgr()	siron(SIR_DTMGR)
125
126/* locore.s */
127int	spl0 __P((void));
128#endif /* _KERNEL */
129
130#endif /* _MAC68K_INTR_H_ */
131