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No need to block out ZS interrupts in clock_intr() as long as 

we are careful to use the single_inst_* macros.
This commit is contained in:
gwr 1997-03-05 00:01:13 +00:00
parent 9587adc460
commit 88bf00b5bf
1 changed files with 5 additions and 8 deletions
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13
sys/arch/sun3/sun3/clock.c
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@ -1,4 +1,4 @@
/* $NetBSD: clock.c,v 1.36 1997/03/04 23:37:48 gwr Exp $ */ /* $NetBSD: clock.c,v 1.37 1997/03/05 00:01:13 gwr Exp $ */
/* /*
* Copyright (c) 1994 Gordon W. Ross * Copyright (c) 1994 Gordon W. Ross
@ -261,16 +261,16 @@ setstatclockrate(newhz)
/* /*
* This is is called by the "custom" interrupt handler. * This is is called by the "custom" interrupt handler.
* Note that we can get ZS interrupts while this runs,
* and those may touch the interrupt_reg, so we have to
* be careful to use the single_inst_* macros to modify
* the interrupt register atomically.
*/ */
void void
clock_intr(cf) clock_intr(cf)
struct clockframe cf; struct clockframe cf;
{ {
register volatile struct intersil7170 *clk = intersil_clock; register volatile struct intersil7170 *clk = intersil_clock;
int s;
/* Prevent ZS interrupts while we tickle the clock. */
s = splhigh();
/* Read the clock interrupt register. */ /* Read the clock interrupt register. */
(void) clk->clk_intr_reg; (void) clk->clk_intr_reg;
@ -280,9 +280,6 @@ clock_intr(cf)
/* Read the clock intr. reg AGAIN! */ /* Read the clock intr. reg AGAIN! */
(void) clk->clk_intr_reg; (void) clk->clk_intr_reg;
/* Back to normal clock priority. */
splx(s);
/* Call common clock interrupt handler. */ /* Call common clock interrupt handler. */
hardclock(&cf); hardclock(&cf);