[src/trunk]: src/sys/arch/mips/mips Fix a bug in cpu_switch() introduced with...

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

details:   https://anonhg.NetBSD.org/src/rev/9232b1834813
branches:  trunk
changeset: 481537:9232b1834813
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Tue Feb 01 18:49:03 2000 +0000

description:
Fix a bug in cpu_switch() introduced with the MIPSX_CPU_IDLE changes; we
have a 1 instruction delay after a load before the register contents are
valid on the R2000/R3000.

diffstat:

 sys/arch/mips/mips/locore.S |  4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diffs (25 lines):

diff -r eb03ab326431 -r 9232b1834813 sys/arch/mips/mips/locore.S
--- a/sys/arch/mips/mips/locore.S       Tue Feb 01 18:38:50 2000 +0000
+++ b/sys/arch/mips/mips/locore.S       Tue Feb 01 18:49:03 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.S,v 1.86 2000/01/28 15:18:32 takemura Exp $     */
+/*     $NetBSD: locore.S,v 1.87 2000/02/01 18:49:03 thorpej Exp $      */
 
 /*
  * Copyright (c) 1992, 1993
@@ -304,6 +304,7 @@
        sw      t0, uvmexp+UVMEXP_SWTCH
        bne     t1, zero, 1f
        lw      t2, _C_LABEL(mips_locore_jumpvec) + MIPSX_CPU_IDLE
+       nop                                     # for r2000/r3000
        jal     ra, t2
        nop
 1:
@@ -323,6 +324,7 @@
        li      t2, -1                          # t2 = lowest bit set
        bne     t0, zero, 1f
        lw      t3, _C_LABEL(mips_locore_jumpvec) + MIPSX_CPU_IDLE
+       nop                                     # for r2000/r3000
        jal     ra, t3
        nop
 1: