kernel: pci: Add PCI lookup routine

This commit adds a new 'lookup_type_t' for representing the various
kinds of lookups one can perform on the PCI bus. The actual code to
drive the lookups is exposed as the pci_bus_lookup() routine.

When doing a lookup of a PCI device, you must specify the kind of lookup
to perform. If a PCI_LU_CLASSREV is requested, only the PCI class and
subclass fields in the PCI lookup are used.

If the PCI_LU_VENDEV is requested, only the PCI vendor ID and device ID
are used in the lookup.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/sys/include/io/pci/pci.h b/src/sys/include/io/pci/pci.h
index bc39647..cff5f0a 100644
--- a/src/sys/include/io/pci/pci.h
+++ b/src/sys/include/io/pci/pci.h
@@ -58,6 +58,20 @@ struct pci_device {
     TAILQ_ENTRY(pci_device) link;
 };
 
+typedef enum {
+    PCI_LU_VENDEV,      /* Vendor / device */
+    PCI_LU_CLASSREV,    /* Class / subclass */
+} lookup_type_t;
+
+/*
+ * Lookup a device on the PCI(e) bus by using the pci_descriptor
+ * as a lookup key.
+ *
+ * @lookup: Lookup descriptor that must match a device
+ * @type:  Lookup type
+ */
+int pci_bus_lookup(struct pci_device *lookup, lookup_type_t type);
+
 /*
  * Read from a specific register on a specific PCI
  * enabled device.