Kernel Development Learning Pipeline

Lecture 14: Monday, 22 July 2024

Announcements

1. Midpoint presentation due by midnight tonight

2. E2 due next week

3. P2 released, due in two weeks

Review

1. In L13 we covered:

   1. What is a character device?

   2. Why do we want to use character devices

   3. How does the user interact with character devices?

   4. How does a kernel module implement a character device?

   5. Demo: random number generator

Lecture overview

1. Extend file_operations with write(2), ioctl(2), and llseek(2)

2. Introduce the jiffies counter and HZ constant

3. Discuss the device class system and struct device

4. Overview of MIDI and our simplification

5. Work through the design and implementation of kkey

6. Listen to the sound of the kernel

Slides

Character Devices 2