Add basic interrupt handling

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2633 42af7a65-404d-4744-a932-0658087f49c3

drivers/net/enc28j60.h

@@ -114,6 +114,7 @@
 #define EIR_DMAIF           (1 << 5) /* Bit 5: DMA Interrupt */
 #define EIR_PKTIF           (1 << 6) /* Bit 6: Receive Packet Pending Interrupt */
                                      /* Bit 7: Reserved */
+#define EIR_ALLINTS         (0x7b)   /* All interrupts */
 
 /* Ethernet Status Register Bit Definitions */