Add a function host_pcib_get_bnsno() that attempts to determine the bus

number of the child bus of a host to PCI bridge by reading from proprietary
configuration registers in the host to PCI bridge devices.

Approved by:	re

1 files changed, 4 insertions, 0 deletions

diff --git a/sys/dev/pci/pcib_private.h b/sys/dev/pci/pcib_private.h
index ec25172..b6ef8b8 100644
--- a/sys/dev/pci/pcib_private.h
+++ b/sys/dev/pci/pcib_private.h
@@ -58,6 +58,10 @@ struct pcib_softc
     u_int8_t	seclat;		/* secondary bus latency timer */
 };
 
+typedef u_int32_t pci_read_config_fn(int b, int s, int f, int reg, int width);
+
+int		host_pcib_get_busno(pci_read_config_fn read_config, int bus,
+    int slot, int func, u_int8_t *busnum);
 int		pcib_attach(device_t dev);
 void		pcib_attach_common(device_t dev);
 int		pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result);