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>

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

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 */

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,

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);

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