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Use atomic operations to manipulate the SSIR, and fix a problem introduced 

with the spllowersoftclock() changes where more interrupts than necessary
were blocked while software interrupts were being processed.
This commit is contained in:
thorpej 1999-08-10 18:53:03 +00:00
parent d0740fb357
commit b701be7c86
2 changed files with 14 additions and 15 deletions
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19
sys/arch/alpha/alpha/machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.177 1999/06/29 07:21:30 ross Exp $ */
/* $NetBSD: machdep.c,v 1.178 1999/08/10 18:53:03 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@ -80,7 +80,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.177 1999/06/29 07:21:30 ross Exp $");
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.178 1999/08/10 18:53:03 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1939,12 +1939,7 @@ do_sir()
{
u_int64_t n;
do {
(void)splhigh();
n = ssir;
ssir = 0;
splsoft(); /* don't recurse through spl0() */
while ((n = alpha_atomic_loadlatch_q(&ssir, 0)) != 0) {
#define COUNT_SOFT uvmexp.softs++
#define DO_SIR(bit, fn) \
@ -1963,15 +1958,17 @@ do_sir()
#undef COUNT_SOFT
#undef DO_SIR
} while (ssir != 0);
}
}
int
spl0()
{
if (ssir)
do_sir(); /* it lowers the IPL itself */
if (ssir) {
(void) alpha_pal_swpipl(ALPHA_PSL_IPL_SOFT);
do_sir();
}
return (alpha_pal_swpipl(ALPHA_PSL_IPL_0));
}

10
sys/arch/alpha/include/intr.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: intr.h,v 1.20 1999/08/05 18:08:08 thorpej Exp $ */
/* $NetBSD: intr.h,v 1.21 1999/08/10 18:53:03 thorpej Exp $ */
/*
* Copyright (c) 1997 Christopher G. Demetriou. All rights reserved.
@ -87,9 +87,11 @@ extern u_int64_t ssir;
#define SIR_CLOCK 0x2
#define SIR_SERIAL 0x4
#define setsoftnet() ssir |= SIR_NET
#define setsoftclock() ssir |= SIR_CLOCK
#define setsoftserial() ssir |= SIR_SERIAL
#define setsoft(x) alpha_atomic_setbits_q(&ssir, (x))
#define setsoftnet() setsoft(SIR_NET)
#define setsoftclock() setsoft(SIR_CLOCK)
#define setsoftserial() setsoft(SIR_SERIAL)
/*
* Interprocessor interrupts. In order how we want them processed.