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Define single-instruction implementations of setsoft*() and siroff(),

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and declare ssir as volatile.  This avoids the problem of lost softints
should a hard interrupt cause a softint to be flagged while we are
clearing a different one.

Idea from atari mtpr.h, modified/optimized by me.
This commit is contained in:
scottr 1997-01-20 05:08:00 +00:00
parent b8b7d0ba0c
commit d19b3500e3
1 changed files with 13 additions and 9 deletions
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22
sys/arch/mac68k/include/cpu.h
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@ -1,4 +1,4 @@
/* $NetBSD: cpu.h,v 1.43 1996/10/15 14:42:49 scottr Exp $ */
/* $NetBSD: cpu.h,v 1.44 1997/01/20 05:08:00 scottr Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -134,16 +134,20 @@ int want_resched; /* resched() was called */
/*
* simulated software interrupt register
*/
extern unsigned char ssir;
extern volatile u_int8_t ssir;
#define SIR_NET 0x1
#define SIR_CLOCK 0x2
#define SIR_SERIAL 0x4
#define SIR_NET 0x01
#define SIR_CLOCK 0x02
#define SIR_SERIAL 0x04
#define siroff(x) ssir &= ~(x)
#define setsoftnet() ssir |= SIR_NET
#define setsoftclock() ssir |= SIR_CLOCK
#define setsoftserial() ssir |= SIR_SERIAL
#define siroff(mask) \
__asm __volatile ( "andb %0,_ssir" : : "ir" (~(mask)));
#define setsoftnet() \
__asm __volatile ( "orb %0,_ssir" : : "i" (SIR_NET))
#define setsoftclock() \
__asm __volatile ( "orb %0,_ssir" : : "i" (SIR_CLOCK))
#define setsoftserial() \
__asm __volatile ( "orb %0,_ssir" : : "i" (SIR_SERIAL))
#define CPU_CONSDEV 1
#define CPU_MAXID 2