1 files changed, 5 insertions, 0 deletions
diff --git a/pci.h b/pci.h
index b751c6f..b4a4f80 100644
--- a/pci.h
+++ b/pci.h
@@ -60,6 +60,11 @@ extern void pci_config_maskw(int bdf, int addr, uint16_t off, uint16_t on);
 
 extern int pci_next(int bdf, int *pmax);
 
+#define PCI_DEVFN(slot, func)	((((slot) & 0x1f) << 3) | ((func) & 0x07))
+#define PCI_BUS(devfn)		((devfn) >> 8)
+#define PCI_SLOT(devfn)		(((devfn) >> 3) & 0x1f)
+#define PCI_FUNC(devfn)		((devfn) & 0x07)
+
 #define foreachpci(BDF, MAX)				\
 	for (MAX = 0x0100, BDF = pci_next(0, &MAX);	\
 	     BDF >= 0;					\