alpha/ia64/powerpc autoconf patch

The patch below makes it possible to insert hooks before and after
boot-time device configuration on alpha, ia64 and powerpc like we
can on other architectures. This is needed to allow boot-time USB
bus exploration to happen at the right time.

Could somebody with access to appropriate hardware check to see if
this change causes any problems?

Thanks,

Ian

Index: alpha/alpha/autoconf.c
===================================================================
RCS file: /home/ncvs/src/sys/alpha/alpha/autoconf.c,v
retrieving revision 1.60
diff -u -r1.60 autoconf.c
--- alpha/alpha/autoconf.c	28 Jul 2004 21:54:56 -0000	1.60
+++ alpha/alpha/autoconf.c	17 Mar 2005 20:33:30 -0000
_at__at_ -54,27 +54,21 _at__at_
 #include <cam/cam_xpt_sim.h>
 #include <cam/cam_debug.h>
 
+static void	configure_first(void *);
 static void	configure(void *);
-SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL)
+static void	configure_final(void *);
 
-static void	configure_finish(void);
-static void	configure_start(void);
+SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
+/* SI_ORDER_SECOND is hookable */
+SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
+/* SI_ORDER_MIDDLE is hookable */
+SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
 
 #ifdef DEV_ISA
 #include <isa/isavar.h>
 device_t isa_bus_device = 0;
 #endif
 
-static void
-configure_start()
-{
-}
-
-static void
-configure_finish()
-{
-}
-
 #if 0
 
 static int
_at__at_ -164,9 +158,13 _at__at_
  * Determine i/o configuration for a machine.
  */
 static void
+configure_first(void *dummy)
+{
+}
+
+static void
 configure(void *dummy)
 {
-	configure_start();
 
 	device_add_child(root_bus, platform.iobus, 0);
 
_at__at_ -179,8 +177,11 _at__at_
 	if (isa_bus_device)
 		isa_probe_children(isa_bus_device);
 #endif
+}
 
-	configure_finish();
+static void
+configure_final(void *dummy)
+{
 
 	/*
 	 * Now we're ready to handle (pending) interrupts.
Index: ia64/ia64/autoconf.c
===================================================================
RCS file: /home/ncvs/src/sys/ia64/ia64/autoconf.c,v
retrieving revision 1.20
diff -u -r1.20 autoconf.c
--- ia64/ia64/autoconf.c	28 Jul 2004 21:54:56 -0000	1.20
+++ ia64/ia64/autoconf.c	17 Mar 2005 20:33:30 -0000
_at__at_ -49,8 +49,15 _at__at_
 #include <cam/cam_xpt_sim.h>
 #include <cam/cam_debug.h>
 
+static void	configure_first(void *);
 static void	configure(void *);
-SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL)
+static void	configure_final(void *);
+
+SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
+/* SI_ORDER_SECOND is hookable */
+SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
+/* SI_ORDER_MIDDLE is hookable */
+SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
 
 #ifdef BOOTP
 void bootpc_init(void);
_at__at_ -65,6 +72,11 _at__at_
  * Determine i/o configuration for a machine.
  */
 static void
+configure_first(void *dummy)
+{
+}
+
+static void
 configure(void *dummy)
 {
 	device_add_child(root_bus, "nexus", 0);
_at__at_ -78,6 +90,11 _at__at_
 	if (isa_bus_device)
 		isa_probe_children(isa_bus_device);
 #endif
+}
+
+static void
+configure_final(void *dummy)
+{
 
 	/*
 	 * Now we're ready to handle (pending) interrupts.
Index: powerpc/powerpc/autoconf.c
===================================================================
RCS file: /home/ncvs/src/sys/powerpc/powerpc/autoconf.c,v
retrieving revision 1.12
diff -u -r1.12 autoconf.c
--- powerpc/powerpc/autoconf.c	3 Apr 2003 21:36:33 -0000	1.12
+++ powerpc/powerpc/autoconf.c	17 Mar 2005 20:33:30 -0000
_at__at_ -35,17 +35,34 _at__at_
 
 static device_t nexusdev;
 
+static void	configure_first(void *);
 static void	configure(void *);
-SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL)
+static void	configure_final(void *);
+
+SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
+/* SI_ORDER_SECOND is hookable */
+SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
+/* SI_ORDER_MIDDLE is hookable */
+SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
 
 /*
  * Determine i/o configuration for a machine.
  */
 static void
+configure_first(void *dummy)
+{
+}
+
+static void
 configure(void *dummy)
 {
 	nexusdev = device_add_child(root_bus, "nexus", 0);
 	root_bus_configure();
+}
+
+static void
+configure_final(void *dummy)
+{
 
 	/*
 	 * Enable device interrupts