Enable interrupts on the BSP once all PICs are initialized.

This moves the enabling of interrupts slightly earlier (the old location
was still before devices were enumerated and probed) and does it in the
interrupt code (rather than in the device configuration code).  This
also avoids tripping over an assertion on the first TLB shootdown with
earlier AP startup.

Reviewed by:	kib
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D5710

sys/amd64/amd64/autoconf.c

@@ -100,13 +100,6 @@ configure(dummy)
 	void *dummy;
 {
 
-	/*
-	 * Enable interrupts on the processor.  The interrupts are still
-	 * disabled in the interrupt controllers until interrupt handlers
-	 * are registered.
-	 */
-	enable_intr();
-
 	/* initialize new bus architecture */
 	root_bus_configure();
 

sys/i386/i386/autoconf.c

@@ -101,13 +101,6 @@ configure(dummy)
 	void *dummy;
 {
 
-	/*
-	 * Enable interrupts on the processor.  The interrupts are still
-	 * disabled in the interrupt controllers until interrupt handlers
-	 * are registered.
-	 */
-	enable_intr();
-
 	/* initialize new bus architecture */
 	root_bus_configure();
 

sys/x86/x86/intr_machdep.c

@@ -393,6 +393,21 @@ intr_init(void *dummy __unused)
 }
 SYSINIT(intr_init, SI_SUB_INTR, SI_ORDER_FIRST, intr_init, NULL);
 
+static void
+intr_init_final(void *dummy __unused)
+{
+
+	/*
+	 * Enable interrupts on the BSP after all of the interrupt
+	 * controllers are initialized.  Device interrupts are still
+	 * disabled in the interrupt controllers until interrupt
+	 * handlers are registered.  Interrupts are enabled on each AP
+	 * after their first context switch.
+	 */
+	enable_intr();
+}
+SYSINIT(intr_init_final, SI_SUB_INTR, SI_ORDER_ANY, intr_init_final, NULL);
+
 #ifndef DEV_ATPIC
 /* Initialize the two 8259A's to a known-good shutdown state. */
 void