powerpc: Get merged kernel to compile and run on 32-bit SMP powermac.

This updates the powermac SMP code to use the mpic driver instead of
the openpic driver and fixes the SMP-dependent context switch code.
We had a subtle bug where we were using interrupt numbers 256-259 for
IPIs, but ppc32 had NR_IRQS = 256.  Moved the IPIs down to use interrupt
numbers 252-255 instead.

Signed-off-by: Paul Mackerras <paulus@samba.org>

5 files changed, 24 insertions, 15 deletions

diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 7bfa0f0121ff..e73b0699b5f0 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -182,11 +182,9 @@ EXPORT_SYMBOL(flush_tlb_kernel_range);
 EXPORT_SYMBOL(flush_tlb_page);
 EXPORT_SYMBOL(_tlbie);
 #ifdef CONFIG_ALTIVEC
-EXPORT_SYMBOL(last_task_used_altivec);
 EXPORT_SYMBOL(giveup_altivec);
 #endif /* CONFIG_ALTIVEC */
 #ifdef CONFIG_SPE
-EXPORT_SYMBOL(last_task_used_spe);
 EXPORT_SYMBOL(giveup_spe);
 #endif /* CONFIG_SPE */
 #ifdef CONFIG_SMP
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index e3946769dd8e..ae316e9ed581 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -272,11 +272,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
          */
         if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC))
                 giveup_altivec(prev);
-        /* Avoid the trap.  On smp this this never happens since
-         * we don't set last_task_used_altivec -- Cort
-         */
-        if (new->thread.regs && last_task_used_altivec == new)
-                new->thread.regs->msr |= MSR_VEC;
 #endif /* CONFIG_ALTIVEC */
 #ifdef CONFIG_SPE
         /*
@@ -288,12 +283,24 @@ struct task_struct *__switch_to(struct task_struct *prev,
          */
         if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
                 giveup_spe(prev);
+#endif /* CONFIG_SPE */
+
+#else  /* CONFIG_SMP */
+#ifdef CONFIG_ALTIVEC
+        /* Avoid the trap.  On smp this this never happens since
+         * we don't set last_task_used_altivec -- Cort
+         */
+        if (new->thread.regs && last_task_used_altivec == new)
+                new->thread.regs->msr |= MSR_VEC;
+#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_SPE
         /* Avoid the trap.  On smp this this never happens since
          * we don't set last_task_used_spe
          */
         if (new->thread.regs && last_task_used_spe == new)
                 new->thread.regs->msr |= MSR_SPE;
 #endif /* CONFIG_SPE */
+
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_PPC64     /* for now */
diff --git a/arch/powerpc/platforms/powermac/pmac_pic.c b/arch/powerpc/platforms/powermac/pmac_pic.c
index a6b1b577e19f..7ddd5264cc6e 100644
--- a/arch/powerpc/platforms/powermac/pmac_pic.c
+++ b/arch/powerpc/platforms/powermac/pmac_pic.c
@@ -430,7 +430,7 @@ void __init pmac_pic_init(void)
                 prom_get_irq_senses(senses, 0, 128);
                 mpic1 = mpic_alloc(irqctrler->addrs[0].address,
                                    MPIC_PRIMARY | MPIC_WANTS_RESET,
-                                   0, 0, 128, 256, senses, 128, " K2-MPIC  ");
+                                   0, 0, 128, 252, senses, 128, " OpenPIC  ");
                 BUG_ON(mpic1 == NULL);
                 mpic_init(mpic1);               
 
@@ -441,14 +441,15 @@ void __init pmac_pic_init(void)
                                irqctrler2->intrs[0].line);
 
                         pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler2, 0, 0);
-                        prom_get_irq_senses(senses, 128, 128 + 128);
+                        prom_get_irq_senses(senses, 128, 128 + 124);
 
                         /* We don't need to set MPIC_BROKEN_U3 here since we don't have
                          * hypertransport interrupts routed to it
                          */
                         mpic2 = mpic_alloc(irqctrler2->addrs[0].address,
                                            MPIC_BIG_ENDIAN | MPIC_WANTS_RESET,
-                                           0, 128, 128, 0, senses, 128, " U3-MPIC  ");
+                                           0, 128, 124, 0, senses, 124,
+                                           " U3-MPIC  ");
                         BUG_ON(mpic2 == NULL);
                         mpic_init(mpic2);
                         mpic_setup_cascade(irqctrler2->intrs[0].line,
diff --git a/arch/powerpc/platforms/powermac/pmac_smp.c b/arch/powerpc/platforms/powermac/pmac_smp.c
index 995e9095d865..fb996336c58b 100644
--- a/arch/powerpc/platforms/powermac/pmac_smp.c
+++ b/arch/powerpc/platforms/powermac/pmac_smp.c
@@ -48,7 +48,7 @@
 #include <asm/machdep.h>
 #include <asm/pmac_feature.h>
 #include <asm/time.h>
-#include <asm/open_pic.h>
+#include <asm/mpic.h>
 #include <asm/cacheflush.h>
 #include <asm/keylargo.h>
 
@@ -638,14 +638,14 @@ void smp_core99_message_pass(int target, int msg, unsigned long data, int wait)
         }
         switch (target) {
         case MSG_ALL:
-                mpic_send_ipi(msg, mask);
+                mpic_send_ipi(msg, cpus_addr(mask)[0]);
                 break;
         case MSG_ALL_BUT_SELF:
                 cpu_clear(smp_processor_id(), mask);
-                mpic_send_ipi(msg, mask);
+                mpic_send_ipi(msg, cpus_addr(mask)[0]);
                 break;
         default:
-                mpic_send_ipi(msg, cpumask_of_cpu(target));
+                mpic_send_ipi(msg, 1 << target);
                 break;
         }
 }
@@ -678,7 +678,7 @@ int __cpu_disable(void)
         cpu_clear(smp_processor_id(), cpu_online_map);
 
         /* XXX reset cpu affinity here */
-        openpic_set_priority(0xf);
+        mpic_cpu_set_priority(0xf);
         asm volatile("mtdec %0" : : "r" (0x7fffffff));
         mb();
         udelay(20);
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index c660e7d7c643..02b4d2488bfd 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -44,6 +44,9 @@ static struct mpic *mpics;
 static struct mpic *mpic_primary;
 static DEFINE_SPINLOCK(mpic_lock);
 
+#ifdef CONFIG_PPC32     /* XXX for now */
+#define distribute_irqs CONFIG_IRQ_ALL_CPUS
+#endif
 
 /*
  * Register accessor functions