Linux Device Driver (3edtion)原版 1. An Introduction to Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 The Role of the Device Driver 2 Splitting the Kernel 4 Classes of Devices and Modules 5 Security Issues 8 Version Numbering 10 License Terms 11 Joining the Kernel Development Community 12 Overview of the Book 12 2. Building and Running Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Setting Up Your Test System 15 The Hello World Module 16 Kernel Modules Versus Applications 18 Compiling and Loading 22 The Kernel Symbol Table 28 Preliminaries 30 Initialization and Shutdown 31 Module Parameters 35 Doing It in User Space 37 Quick Reference 39 3. Char Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 The Design of scull 42 Major and Minor Numbers 43 Some Important Data Structures 49 ,ldr3TOC.fm.4587 Page v Thursday, January 20, 2005 9:30 AMvi | Table of Contents Char Device Registration 55 open and release 58 scull’s Memory Usage 60 read and write 63 Playing with the New Devices 70 Quick Reference 70 4. Debugging Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Debugging Support in the Kernel 73 Debugging by Printing 75 Debugging by Querying 82 Debugging by Watching 91 Debugging System Faults 93 Debuggers and Related Tools 99 5. Concurrency and Race Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Pitfalls in scull 107 Concurrency and Its Management 107 Semaphores and Mutexes 109 Completions 114 Spinlocks 116 Locking Traps 121 Alternatives to Locking 123 Quick Reference 130 6. Advanced Char Driver Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 ioctl 135 Blocking I/O 147 poll and select 163 Asynchronous Notification 169 Seeking a Device 171 Access Control on a Device File 173 Quick Reference 179