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clean up cpu_switchto() a little - no need to flushw or membar 

excessively.  optimise an rdpr.  tested by tnn.
This commit is contained in:
mrg 2007-05-28 20:09:50 +00:00
parent 36a21907e2
commit 8f8cea5c68
1 changed files with 2 additions and 5 deletions
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7
sys/arch/sparc64/sparc64/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.249 2007/05/23 08:16:43 martin Exp $ */
/* $NetBSD: locore.s,v 1.250 2007/05/28 20:09:50 mrg Exp $ */
/*
* Copyright (c) 1996-2002 Eduardo Horvath
@ -6625,7 +6625,6 @@ ENTRY(cpu_idle)
* the old lwp switched away from
*/
ENTRY(cpu_switchto)
flushw
save %sp, -CC64FSZ, %sp
/*
* REGISTER USAGE AT THIS POINT:
@ -6644,21 +6643,19 @@ ENTRY(cpu_switchto)
*/
flushw ! save all register windows except this one
membar #Sync
rdpr %pstate, %o1 ! oldpstate = %pstate;
wrpr %g0, PSTATE_KERN, %pstate ! make sure we're on normal globals
! with traps turned off
brz,pn %i0, 1f
sethi %hi(CPCB), %l6
rdpr %pstate, %o1 ! oldpstate = %pstate;
LDPTR [%i0 + L_ADDR], %l5
stx %i7, [%l5 + PCB_PC]
stx %i6, [%l5 + PCB_SP]
sth %o1, [%l5 + PCB_PSTATE]
rdpr %cwp, %o2 ! Useless
stb %o2, [%l5 + PCB_CWP]