Add a way to look up basic PCI info for an ACPI device. It works for retrieving

the base bus number and segment which is what we're using them for. It should
work generically, however I only tested it to look up PCI bridge devices.
The logic is a subset of what is done in AcpiEvPciConfigRegionSetup when setting
up the operation region for a PCI device.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41365 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/drivers/ACPI.h

@@ -135,6 +135,15 @@ enum {
 	ACPI_ALLOCATE_BUFFER = -1,
 };
 
+
+typedef struct acpi_pci_info {
+	uint16	segment;
+	uint16	bus;
+	uint16	device;
+	uint16	function;
+} acpi_pci_info;
+
+
 /*
  * acpi_status should return ACPI specific error codes, not BeOS ones.
  */
@@ -248,6 +257,10 @@ struct acpi_module_info {
 					size_t size);
 	status_t	(*enter_sleep_state)(uint8 state);
 	status_t	(*reboot)(void);
+
+	/* PCI specific info */
+	status_t	(*get_pci_info)(acpi_handle pciRootBridge, acpi_handle device,
+					acpi_pci_info *info);
 };