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Switch to the idle stack in the idle loop.

This commit is contained in:
tsubai 2000-12-17 22:57:35 +00:00
parent 927b45cf65
commit 00940e9045
1 changed files with 23 additions and 3 deletions
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26
sys/arch/macppc/macppc/locore.S
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@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.30 2000/12/04 17:05:51 tsubai Exp $ */
/* $NetBSD: locore.S,v 1.31 2000/12/17 22:57:35 tsubai Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -345,11 +345,31 @@ ofw_back:
* When we get here, interrupts are off (MSR[EE]=0) and sched_lock is held.
*/
ASENTRY(Idle)
#if defined(MULTIPROCESSOR)
/* Switch to the idle PCB unless we're already running on it. */
cmpwi 30,0 /* old process was exiting? */
beq idle_loop
mfsr 10,USER_SR /* save USER_SR for copyin/copyout */
mfcr 11 /* save cr */
mr 12,2 /* save r2 */
stwu 1,-SFRAMELEN(1) /* still running on old stack */
stmw 10,8(1)
lwz 3,P_ADDR(30)
stw 1,PCB_SP(3) /* save SP */
GET_CPUINFO(7)
lwz 6,CI_IDLE_PCB(7)
addi 1,6,USPACE-16 /* 16 bytes are reserved at stack top */
li 30,0 /* we are now on idle stack */
#endif
idle_loop:
lis 8,_C_LABEL(sched_whichqs)@ha
lwz 9,_C_LABEL(sched_whichqs)@l(8)
or. 9,9,9
bne- .Lsw1 /* at least one queue non-empty */
bne+ .Lsw1 /* at least one queue non-empty */
#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
bl _C_LABEL(sched_unlock_idle)
@ -379,7 +399,7 @@ ASENTRY(Idle)
#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
bl _C_LABEL(sched_lock_idle)
#endif
b _ASM_LABEL(Idle)
b idle_loop
/*
* switchexit gets called from cpu_exit to complete the exit procedure.