intr.h revision 1.2 
1/*	$NetBSD: intr.h,v 1.2 1997/04/14 06:25:32 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Scott Reynolds for
18 *      the NetBSD Project.
19 * 4. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#ifndef _MAC68K_INTR_H_
35#define _MAC68K_INTR_H_
36
37#ifdef _KERNEL
38/*
39 * spl functions; all but spl0 are done in-line
40 */
41
42#define _spl(s)								\
43({									\
44        register int _spl_r;						\
45									\
46        __asm __volatile ("clrl %0; movew sr,%0; movew %1,sr" :		\
47                "&=d" (_spl_r) : "di" (s));				\
48        _spl_r;								\
49})
50
51#define _splraise(s)							\
52({									\
53	register int _spl_r;						\
54									\
55	__asm __volatile ("clrl %0; movew sr,%0;" : "&=d" (_spl_r) : );	\
56	if ((_spl_r & PSL_IPL) < ((s) & PSL_IPL))			\
57		__asm __volatile ("movew %0,sr;" : : "di" (s));		\
58	_spl_r;								\
59})
60
61/* spl0 requires checking for software interrupts */
62#define spl1()  _spl(PSL_S|PSL_IPL1)
63#define spl2()  _spl(PSL_S|PSL_IPL2)
64#define spl3()  _spl(PSL_S|PSL_IPL3)
65#define spl4()  _spl(PSL_S|PSL_IPL4)
66#define spl5()  _spl(PSL_S|PSL_IPL5)
67#define spl6()  _spl(PSL_S|PSL_IPL6)
68#define spl7()  _spl(PSL_S|PSL_IPL7)
69
70/*
71 * These should be used for:
72 * 1) ensuring mutual exclusion (why use processor level?)
73 * 2) allowing faster devices to take priority
74 *
75 * Note that on the Mac, most things are masked at spl1, almost
76 * everything at spl2, and everything but the panic switch and
77 * power at spl4.
78 */
79#define	splsoftclock()	spl1()	/* disallow softclock */
80#define	splsoftnet()	spl1()	/* disallow network */
81#define	spltty()	spl1()	/* disallow tty (softserial & ADB) */
82#define	splbio()	spl2()	/* disallow block I/O */
83#define	splnet()	spl2()	/* disallow network */
84#define	splimp()	spl2()	/* mutual exclusion for memory allocation */
85#define	splclock()	spl2()	/* disallow clock (and other) interrupts */
86#define	splstatclock()	spl2()	/* ditto */
87#define	splzs()		spl4()	/* disallow serial hw interrupts */
88#define	spladb()	spl7()	/* disallow adb interrupts */
89#define	splhigh()	spl7()	/* disallow everything */
90#define	splsched()	spl7()	/* disallow scheduling */
91
92/* watch out for side effects */
93#define splx(s)         ((s) & PSL_IPL ? _spl(s) : spl0())
94
95/*
96 * simulated software interrupt register
97 */
98extern volatile u_int8_t ssir;
99
100#define	SIR_NET		0x01
101#define	SIR_CLOCK	0x02
102#define	SIR_SERIAL	0x04
103
104#define	siron(mask)	\
105	__asm __volatile ( "orb %0,_ssir" : : "i" (mask))
106#define	siroff(mask)	\
107	__asm __volatile ( "andb %0,_ssir" : : "ir" (~(mask)));
108
109#define	setsoftnet()	siron(SIR_NET)
110#define	setsoftclock()	siron(SIR_CLOCK)
111#define	setsoftserial()	siron(SIR_SERIAL)
112
113/* locore.s */
114int	spl0 __P((void));
115#endif /* _KERNEL */
116
117#endif /* _MAC68K_INTR_H_ */
118