Compaq AA-RNG2A-TE Implementing the Interrupt Section, Network Device Driver Configuration Index

12.15 Resetting the Device (SIOCIFRESET ioctl Command) 12–11

12.16Setting Device Characteristics (SIOCIFSETCHAR ioctl

Command)	12–11
12.17 Releasing the Simple Lock and Resetting the IPL	12–13

13 Implementing the Interrupt Section

13.1 Implementing the el_intr Routine		13–1
13.1.1	Setting the IPL and Obtaining the Simple Lock	13–2
13.1.2	Rearming the Next Timeout	13–2
13.1.3	Reading the Interrupt Status	13–3
13.1.4	Processing Completed Receive and Transmit Operations .	13–3
13.1.5	Acknowledging the Interrupt	13–4
13.1.6	Transmitting Pending Frames	13–4
13.1.7	Releasing the Simple Lock and Resetting the IPL	13–4
13.1.8	Indicating That the Interrupt Was Serviced	13–5
13.2 Implementing the el_rint Routine		13–5

13.2.1Counting the Receive Interrupt and Reading the Receive

	Status	13–5
13.2.2	Pulling the Packets from the FIFO Buffer	13–6
13.2.3	Examining the First Part of the Packet	13–7
13.2.4	Copying the Received Packet into the mbuf	13–8
13.2.5	Discarding a Packet	13–9
13.3 Implementing the el_tint Routine		13–10
13.3.1	Counting the Transmit Interrupt	13–10

13.3.2Reading the Transmit Status and Counting All Significant

	Events	13–10
13.3.3	Managing Excessive Data Collisions	13–11
13.3.4	Writing to the Status Register to Obtain the Next Value ..	13–11
13.3.5	Queuing Other Transmits	13–12
13.4 Implementing the el_error Routine		13–12

14Network Device Driver Configuration

Index

Figures

1–1	Sections of a Network Device Driver		1–2
2–1	Window 0	Configuration Registers	2–5
2–2	Window 3	Configuration Registers	2–8
2–3	Window 1	Operational Registers	2–9

viii Contents