[POWERPC] iSeries: Use alternate paca structure for booting
The iSeries HV only needs the first two fields of the paca statically
initialised, so create an alternate paca that contains only those and
switch to our real paca immediately after boot.
This is in order to make the 1024 cpu patches easier since they will no
longer have to statically initialise the pacas for iSeries.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S
index 5381038..c775cd4 100644
--- a/arch/powerpc/platforms/iseries/exception.S
+++ b/arch/powerpc/platforms/iseries/exception.S
@@ -38,11 +38,19 @@
.globl system_reset_iSeries
system_reset_iSeries:
- mfspr r13,SPRN_SPRG3 /* Get paca address */
+ mfspr r13,SPRN_SPRG3 /* Get alpaca address */
+ LOAD_REG_IMMEDIATE(r23, alpaca)
+ li r0,ALPACA_SIZE
+ sub r23,r13,r23
+ divdu r23,r23,r0 /* r23 has cpu number */
+ LOAD_REG_IMMEDIATE(r13, paca)
+ mulli r0,r23,PACA_SIZE
+ add r13,r13,r0
+ mtspr SPRN_SPRG3,r13 /* Save it away for the future */
mfmsr r24
ori r24,r24,MSR_RI
mtmsrd r24 /* RI on */
- lhz r24,PACAPACAINDEX(r13) /* Get processor # */
+ mr r24,r23
cmpwi 0,r24,0 /* Are we processor 0? */
bne 1f
b .__start_initialization_iSeries /* Start up the first processor */