[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>

1 files changed, 37 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/iseries/lpardata.c b/arch/powerpc/platforms/iseries/lpardata.c
index 8162049bb04d..dc8470850a81 100644
--- a/arch/powerpc/platforms/iseries/lpardata.c
+++ b/arch/powerpc/platforms/iseries/lpardata.c
@@ -18,6 +18,7 @@
 #include <asm/paca.h>
 #include <asm/iseries/lpar_map.h>
 #include <asm/iseries/it_lp_queue.h>
+#include <asm/iseries/alpaca.h>
 
 #include "naca.h"
 #include "vpd_areas.h"
@@ -159,6 +160,40 @@ struct SpCommArea xSpCommArea = {
         .xFormat = 1,
 };
 
+#define ALPACA_INIT(number)                                             \
+{                                                                       \
+        .lppaca_ptr = &lppaca[number],                                  \
+        .reg_save_ptr = &iseries_reg_save[number],                      \
+}
+
+struct alpaca alpaca[] = {
+        ALPACA_INIT( 0),
+#if NR_CPUS > 1
+        ALPACA_INIT( 1), ALPACA_INIT( 2), ALPACA_INIT( 3),
+#if NR_CPUS > 4
+        ALPACA_INIT( 4), ALPACA_INIT( 5), ALPACA_INIT( 6), ALPACA_INIT( 7),
+#if NR_CPUS > 8
+        ALPACA_INIT( 8), ALPACA_INIT( 9), ALPACA_INIT(10), ALPACA_INIT(11),
+        ALPACA_INIT(12), ALPACA_INIT(13), ALPACA_INIT(14), ALPACA_INIT(15),
+        ALPACA_INIT(16), ALPACA_INIT(17), ALPACA_INIT(18), ALPACA_INIT(19),
+        ALPACA_INIT(20), ALPACA_INIT(21), ALPACA_INIT(22), ALPACA_INIT(23),
+        ALPACA_INIT(24), ALPACA_INIT(25), ALPACA_INIT(26), ALPACA_INIT(27),
+        ALPACA_INIT(28), ALPACA_INIT(29), ALPACA_INIT(30), ALPACA_INIT(31),
+#if NR_CPUS > 32
+        ALPACA_INIT(32), ALPACA_INIT(33), ALPACA_INIT(34), ALPACA_INIT(35),
+        ALPACA_INIT(36), ALPACA_INIT(37), ALPACA_INIT(38), ALPACA_INIT(39),
+        ALPACA_INIT(40), ALPACA_INIT(41), ALPACA_INIT(42), ALPACA_INIT(43),
+        ALPACA_INIT(44), ALPACA_INIT(45), ALPACA_INIT(46), ALPACA_INIT(47),
+        ALPACA_INIT(48), ALPACA_INIT(49), ALPACA_INIT(50), ALPACA_INIT(51),
+        ALPACA_INIT(52), ALPACA_INIT(53), ALPACA_INIT(54), ALPACA_INIT(55),
+        ALPACA_INIT(56), ALPACA_INIT(57), ALPACA_INIT(58), ALPACA_INIT(59),
+        ALPACA_INIT(60), ALPACA_INIT(61), ALPACA_INIT(62), ALPACA_INIT(63),
+#endif
+#endif
+#endif
+#endif
+};
+
 /* The LparMap data is now located at offset 0x6000 in head.S
  * It was put there so that the HvReleaseData could address it
  * with a 32-bit offset as required by the iSeries hypervisor
@@ -185,7 +220,7 @@ struct ItVpdAreas itVpdAreas = {
         .xSlicVpdLens = {                       /* VPD lengths */
                 0,0,0,                  /*  0 - 2 */
                 sizeof(xItExtVpdPanel), /*       3 Extended VPD   */
-                sizeof(struct paca_struct),     /*       4 length of Paca  */
+                sizeof(struct alpaca),  /*       4 length of (fake) Paca  */
                 0,                      /*       5 */
                 sizeof(struct ItIplParmsReal),/* 6 length of IPL parms */
                 26992,                  /*       7 length of MS VPD */
@@ -203,7 +238,7 @@ struct ItVpdAreas itVpdAreas = {
         .xSlicVpdAdrs = {                       /* VPD addresses */
                 0,0,0,                  /*       0 -  2 */
                 &xItExtVpdPanel,        /*       3 Extended VPD */
-                &paca[0],               /*       4 first Paca */
+                &alpaca[0],             /*       4 first (fake) Paca */
                 0,                      /*       5 */
                 &xItIplParmsReal,       /*       6 IPL parms */
                 &xMsVpd,                /*       7 MS Vpd */