[src/trunk]: src/sys/arch/powerpc/mpc6xx for MP builds, save and restore sprg...

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

details:   https://anonhg.NetBSD.org/src/rev/edf897ecc09b
branches:  trunk
changeset: 534394:edf897ecc09b
user:      chs <chs%NetBSD.org@localhost>
date:      Wed Jul 24 06:04:43 2002 +0000

description:
for MP builds, save and restore sprg0 (which contains the curcpu pointer)
around restoring OFW's sprg registers while calling into OFW.

diffstat:

 sys/arch/powerpc/mpc6xx/ofw_subr.S |  21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diffs (49 lines):

diff -r ebcfb030ace9 -r edf897ecc09b sys/arch/powerpc/mpc6xx/ofw_subr.S
--- a/sys/arch/powerpc/mpc6xx/ofw_subr.S        Wed Jul 24 05:44:37 2002 +0000
+++ b/sys/arch/powerpc/mpc6xx/ofw_subr.S        Wed Jul 24 06:04:43 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ofw_subr.S,v 1.1 2002/07/06 18:01:23 matt Exp $        */
+/*     $NetBSD: ofw_subr.S,v 1.2 2002/07/24 06:04:43 chs Exp $ */
 
 /*
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -40,6 +40,11 @@
 GLOBAL(ofmsr)
        .long   0,0,0,0,0               /* msr & sprg[0-3] used in OF */
 
+#ifdef MULTIPROCESSOR
+GLOBAL(ofwsprg0save)
+       .long   0
+#endif
+
        .comm   firmstk,NBPG,8
        .comm   openfirmware_entry,4,4  /* openfirmware entry point */
        .comm   ofwsrsave,64,4          /* openfirmware SR savearea */
@@ -107,6 +112,13 @@
        cmpwi   5,0
        bne     1b
 
+#ifdef MULTIPROCESSOR
+       mfsprg  5,0                     /* save current sprg0 (curcpu) */
+       lis     4,ofwsprg0save@ha
+       addi    4,4,ofwsprg0save@l
+       stw     5,0(4)
+#endif
+
        lis     4,_C_LABEL(ofw_pmap)@ha /* load OFW SR */
        addi    4,4,_C_LABEL(ofw_pmap)@l
        lwz     0,PM_KERNELSR(4)
@@ -135,6 +147,13 @@
 
        blrl                            /* call Open Firmware */
 
+#ifdef MULTIPROCESSOR
+       lis     4,ofwsprg0save@ha       /* return saved sprg0 (curcpu) */
+       addi    4,4,ofwsprg0save@l
+       lwz     5,0(4)
+       mtsprg  0,5
+#endif
+
        lis     4,ofwsrsave@ha          /* restore saved SRs */
        addi    4,4,ofwsrsave@l
        li      5,0