diff --git a/sys/alpha/pci/tsunami.c b/sys/alpha/pci/tsunami.c
index 48cdd457e94..5468a62ca0d 100644
--- a/sys/alpha/pci/tsunami.c
+++ b/sys/alpha/pci/tsunami.c
@@ -275,9 +275,13 @@ tsunami_check_abort(void)
 	KV(TSUNAMI_CONF(h) | ((b) << 16) | ((s) << 11) | ((f) << 8) | (r))
 
 #define CFGREAD(h, b, s, f, r, op, width, type)			\
-	int bus = tsunami_bus_within_hose(h, b) ? b : 0;	\
-	vm_offset_t va = TSUNAMI_CFGADDR(bus, s, f, r, h);	\
+	int bus;						\
+        vm_offset_t va;						\
 	type data;						\
+	if (h == (u_int8_t)-1)					\
+		h = tsunami_hose_from_bus(b);			\
+	bus = tsunami_bus_within_hose(h, b) ? b : 0;		\
+	va = TSUNAMI_CFGADDR(bus, s, f, r, h);			\
 	tsunami_clear_abort();					\
 	if (badaddr((caddr_t)va, width)) {			\
 		tsunami_check_abort();				\
@@ -289,8 +293,12 @@ tsunami_check_abort(void)
 	return data;			
 
 #define CFWRITE(h, b, s, f, r, data, op, width)			\
-	int bus = tsunami_bus_within_hose(h, b) ? b : 0;	\
-	vm_offset_t va = TSUNAMI_CFGADDR(bus, s, f, r, h);	\
+	int bus;						\
+        vm_offset_t va;						\
+	if (h == (u_int8_t)-1)					\
+		h = tsunami_hose_from_bus(b);			\
+	bus = tsunami_bus_within_hose(h, b) ? b : 0;		\
+	va = TSUNAMI_CFGADDR(bus, s, f, r, h);			\
 	tsunami_clear_abort();					\
 	if (badaddr((caddr_t)va, width)) 			\
 		return;						\
diff --git a/sys/alpha/pci/tsunami_pci.c b/sys/alpha/pci/tsunami_pci.c
index 6f7af8820f1..634260c476d 100644
--- a/sys/alpha/pci/tsunami_pci.c
+++ b/sys/alpha/pci/tsunami_pci.c
@@ -41,7 +41,7 @@
 
 static devclass_t	pcib_devclass;
 
-int tsunami_hoses[TSUNAMI_MAXHOSES] = {0,0,0,0};
+int tsunami_hoses[TSUNAMI_MAXHOSES+1] = {0,-1,-1,-1,-1};
 
 int
 tsunami_bus_within_hose(int hose, int bus)
@@ -49,6 +49,19 @@ tsunami_bus_within_hose(int hose, int bus)
 	return(bus - tsunami_hoses[hose]);
 }
 
+int 
+tsunami_hose_from_bus(int bus)
+{
+	int i;
+	for(i = 1; i <= TSUNAMI_MAXHOSES && tsunami_hoses[i] != -1; i++){
+		if(tsunami_hoses[i] > bus)
+			return i-1;
+	}
+	return i-1;
+	
+}
+
+
 static int
 tsunami_pcib_probe(device_t dev)
 {
diff --git a/sys/alpha/pci/tsunamivar.h b/sys/alpha/pci/tsunamivar.h
index f82351f702f..89cb2aba65c 100644
--- a/sys/alpha/pci/tsunamivar.h
+++ b/sys/alpha/pci/tsunamivar.h
@@ -28,3 +28,4 @@
 
 extern void tsunami_init(void);
 extern int tsunami_bus_within_hose(int, int);
+extern int tsunami_hose_from_bus(int);
diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index 4305b6cfd81..bfdf9d0452e 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -845,7 +845,7 @@ pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 		case 4:
 		case 2:
 		case 1:
-			probe.hose = 0; /* XXXXX */
+			probe.hose = -1;
 			probe.bus = io->pi_sel.pc_bus;
 			probe.slot = io->pi_sel.pc_dev;
 			probe.func = io->pi_sel.pc_func;
@@ -866,7 +866,7 @@ pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 		case 4:
 		case 2:
 		case 1:
-			probe.hose = 0; /* XXXXX */
+			probe.hose = -1; 
 			probe.bus = io->pi_sel.pc_bus;
 			probe.slot = io->pi_sel.pc_dev;
 			probe.func = io->pi_sel.pc_func;
diff --git a/sys/pci/pci.c b/sys/pci/pci.c
index 4305b6cfd81..bfdf9d0452e 100644
--- a/sys/pci/pci.c
+++ b/sys/pci/pci.c
@@ -845,7 +845,7 @@ pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 		case 4:
 		case 2:
 		case 1:
-			probe.hose = 0; /* XXXXX */
+			probe.hose = -1;
 			probe.bus = io->pi_sel.pc_bus;
 			probe.slot = io->pi_sel.pc_dev;
 			probe.func = io->pi_sel.pc_func;
@@ -866,7 +866,7 @@ pci_ioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
 		case 4:
 		case 2:
 		case 1:
-			probe.hose = 0; /* XXXXX */
+			probe.hose = -1; 
 			probe.bus = io->pi_sel.pc_bus;
 			probe.slot = io->pi_sel.pc_dev;
 			probe.func = io->pi_sel.pc_func;