[src/trunk]: src/sys/arch/macppc/macppc Switch to the idle stack in the idle ...

[tsubai <tsubai%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3bd0512425f1
branches:  trunk
changeset: 500749:3bd0512425f1
user:      tsubai <tsubai%NetBSD.org@localhost>
date:      Sun Dec 17 22:57:35 2000 +0000

description:
Switch to the idle stack in the idle loop.

diffstat:

 sys/arch/macppc/macppc/locore.S |  26 +++++++++++++++++++++++---
 1 files changed, 23 insertions(+), 3 deletions(-)

diffs (51 lines):

diff -r 30012f9dc601 -r 3bd0512425f1 sys/arch/macppc/macppc/locore.S
--- a/sys/arch/macppc/macppc/locore.S   Sun Dec 17 22:55:53 2000 +0000
+++ b/sys/arch/macppc/macppc/locore.S   Sun Dec 17 22:57:35 2000 +0000
@@ -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 @@
  * 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 @@
 #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.