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    FreeBSD Device Drivers

    • FreeBSD Device Drivers

    • By:

    • Publisher: No Starch Press

    • Pub. Date:

    • Print ISBN-13: 978-1-59327-204-3

    • Pages in Print Edition: 352

    • Subscriber Rating: 0 out of 5 rating0 [0 Ratings]

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    Overview

    FreeBSD Device Drivers is the first and only book to teach readers how to develop device drivers for the FreeBSD operating system.

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    Table of Contents

     

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    FreeBSD Device Drivers

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    About the Technical Reviewer

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    Foreword

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    Acknowledgments

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    Introduction
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    Who Is This Book For?

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    Prerequisites

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    Contents at a Glance

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    Welcome Aboard!

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    1 Token    1. Building and Running Modules
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    Types of Device Drivers

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    Loadable Kernel Modules
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    Module Event Handler

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    DECLARE_MODULE Macro

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    Hello, world!

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    Compiling and Loading

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    Character Drivers
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    d_foo Functions

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    Character Device Switch Table

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    make_dev and destroy_dev Functions

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    Mostly Harmless
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    echo_write Function

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    echo_read Function

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    echo_modevent Function

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    DEV_MODULE Macro

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    Don’t Panic

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    Block Drivers Are Gone

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    Conclusion

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    1 Token    2. Allocating Memory
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    Memory Management Routines

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    malloc_type Structures
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    MALLOC_DEFINE Macro

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    MALLOC_DECLARE Macro

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    Tying Everything Together

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    Contiguous Physical Memory Management Routines

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    A Straightforward Example

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    Conclusion

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    1 Token    3. Device Communication and Control
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    ioctl

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    Defining ioctl Commands

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    Implementing ioctl
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    echo_write Function

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    echo_set_buffer_size Function

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    echo_ioctl Function

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    echo_modevent Function

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    Don’t Panic

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    Invoking ioctl

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    sysctl

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    Implementing sysctls, Part 1

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    sysctl Context Management Routines

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    Creating Dynamic sysctls
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    SYSCTL_STATIC_CHILDREN Macro

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    SYSCTL_CHILDREN Macro

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    Implementing sysctls, Part 2
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    sysctl_set_buffer_size Function

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    Don’t Panic

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    Conclusion

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    4. Thread Synchronization
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    A Simple Synchronization Problem

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    A More Complex Synchronization Problem
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    race_new Function

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    race_find Function

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    race_destroy Function

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    race_ioctl Function

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    race_modevent Function

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    The Root of the Problem

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    Preventing Race Conditions

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    Mutexes
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    Spin Mutexes

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    Sleep Mutexes

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    Mutex Management Routines

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    Implementing Mutexes
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    race_modevent Function

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    Don’t Panic

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    Shared/Exclusive Locks

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    Shared/Exclusive Lock Management Routines

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    Implementing Shared/Exclusive Locks

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    Reader/Writer Locks

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    Reader/Writer Lock Management Routines

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    Condition Variables

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    Condition Variable Management Routines

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    General Guidelines
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    Avoid Recursing on Exclusive Locks

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    Avoid Holding Exclusive Locks for Long Periods of Time

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    Conclusion

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    1 Token    5. Delaying Execution
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    Voluntary Context Switching, or Sleeping

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    Implementing Sleeps and Condition Variables
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    sleep_modevent Function

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    load Function

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    sleep_thread Function

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    sysctl_debug_sleep_test Function

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    unload Function

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    Don’t Panic

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    Kernel Event Handlers

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    Callouts

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    Callouts and Race Conditions

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    Taskqueues
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    Global Taskqueues

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    Taskqueue Management Routines

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    Conclusion

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    1 Token    6. Case Study: Virtual Null Modem
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    Prerequisites

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    Code Analysis
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    nmdm_modevent Function

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    nmdm_clone Function

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    nmdm_alloc Function

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    nmdm_outwakeup Function

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    nmdm_task_tty Function

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    nmdm_inwakeup Function

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    nmdm_modem Function

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    nmdm_param Function

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    nmdm_timeout Function

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    bits_per_char Function

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    Don’t Panic

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    Conclusion

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    1 Token    7. Newbus and Resource Allocation

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    Autoconfiguration and Newbus Drivers
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    device_foo Functions

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    Device Method Table

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    DRIVER_MODULE Macro

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    Tying Everything Together
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    foo_pci_probe Function

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    foo_pci_attach Function

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    d_foo Functions

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    foo_pci_detach Function

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    Don’t Panic

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    Hardware Resource Management

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    Conclusion

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    1 Token    8. Interrupt Handling
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    Registering an Interrupt Handler

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    Interrupt Handlers in FreeBSD

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    Implementing an Interrupt Handler
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    pint_identify Function

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    pint_probe Function

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    pint_attach Function

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    pint_detach Function

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    pint_open Function

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    pint_close Function

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    pint_write Function

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    pint_read Function

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    pint_intr Function

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    Don’t Panic

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    Generating Interrupts on the Parallel Port

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    Conclusion

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    1 Token    9. Case Study: Parallel Port Printer Driver

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    Code Analysis
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    lpt_identify Function

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    lpt_probe Function

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    lpt_detect Function

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    lpt_port_test Function

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    lpt_attach Function

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    lpt_detach Function

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    lpt_open Function

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    lpt_read Function

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    lpt_write Function

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    lpt_intr Function

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    lpt_timeout Function

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    lpt_push_bytes Function

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    lpt_close Function

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    lpt_ioctl Function

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    lpt_request_ppbus Function

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    lpt_release_ppbus Function

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    Conclusion

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    1 Token    10. Managing and Using Resources

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    I/O Ports and I/O Memory
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    Reading from I/O Ports and I/O Memory

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    Writing to I/O Ports and I/O Memory

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    Stream Operations

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    Memory Barriers

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    Tying Everything Together
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    led_identify Function

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    led_probe Function

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    led_attach Function

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    led_detach Function

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    led_open Function

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    led_close Function

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    led_read Function

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    led_write Function

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    Conclusion

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    1 Token    11. Case Study: Intelligent Platform Management Interface Driver

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    Code Analysis
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    ipmi_pci_probe Function

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    ipmi_pci_match Function

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    ipmi_pci_attach Function

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    ipmi2_pci_probe Function

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    ipmi2_pci_attach Function

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    Conclusion

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    1 Token    12. Direct Memory Access

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    Implementing DMA
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    Initiating a DMA Data Transfer

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    Dismantling DMA

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    Creating DMA Tags

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    Tearing Down DMA Tags

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    DMA Map Management Routines, Part 1

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    Loading (DMA) Buffers into DMA Maps
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    bus_dma_segment Structures

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    bus_dmamap_load Function

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    bus_dmamap_load_mbuf Function

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    bus_dmamap_load_mbuf_sg Function

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    bus_dmamap_load_uio Function

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    bus_dmamap_unload Function

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    DMA Map Management Routines, Part 2

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    A Straightforward Example

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    Synchronizing DMA Buffers

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    Conclusion

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    1 Token    13. Storage Drivers

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    disk Structures
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    Descriptive Fields

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    Storage Device Methods

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    Mandatory Media Properties

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    Optional Media Properties

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    Driver Private Data

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    disk Structure Management Routines

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    Block I/O Structures

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    Block I/O Queues

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    Tying Everything Together
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    at45d_attach Function

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    at45d_delayed_attach Function

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    at45d_get_info Function

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    at45d_wait_for_device_ready Function

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    at45d_get_status Function

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    at45d_strategy Function

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    at45d_task Function

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    Block I/O Completion Routines

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    Conclusion

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    1 Token    14. Common Access Method
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    How CAM Works

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    A (Somewhat) Simple Example
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    mfip_attach Function

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    mfip_detach Function

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    mfip_action Function

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    mfip_poll Function

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    mfip_start Function

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    mfip_done Function

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    SIM Registration Routines
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    cam_simq_alloc Function

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    cam_sim_alloc Function

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    xpt_bus_register Function

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    Action Routines
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    XPT_PATH_INQ

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    XPT_RESET_BUS

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    XPT_GET_TRAN_SETTINGS

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    XPT_SET_TRAN_SETTINGS

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    XPT_SCSI_IO

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    XPT_RESET_DEV

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    Conclusion

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    1 Token    15. USB Drivers
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    About USB Devices

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    More About USB Devices

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    USB Configuration Structures
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    Mandatory Fields

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    Optional Fields

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    USB Transfer Flags

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    USB Transfers (in FreeBSD)

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    USB Configuration Structure Management Routines

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    USB Methods Structure

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    Tying Everything Together
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    ulpt_probe Function

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    ulpt_attach Function

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    ulpt_detach Function

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    ulpt_open Function

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    ulpt_reset Function

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    unlpt_open Function

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    ulpt_close Function

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    ulpt_ioctl Function

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    ulpt_watchdog Function

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    ulpt_start_read Function

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    ulpt_stop_read Function

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    ulpt_start_write Function

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    ulpt_stop_write Function

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    ulpt_write_callback Function

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    ulpt_read_callback Function

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    ulpt_status_callback Function

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    Conclusion

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    1 Token    16. Network Drivers, Part 1: Data Structures
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    Network Interface Structures

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    Network Interface Structure Management Routines
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    ether_ifattach Function

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    ether_ifdetach Function

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    Network Interface Media Structures

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    Network Interface Media Structure Management Routines

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    Hello, world!

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    mbuf Structures

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    Message Signaled Interrupts

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    Implementing MSI

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    MSI Management Routines

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    Conclusion

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    1 Token    17. Network Drivers, Part 2: Packet Reception and Transmission

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    Packet Reception
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    em_rxeof Function

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    em_handle_rx Function

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    Packet Transmission
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    em_start_locked Function

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    em_txeof Function

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    Post Packet Transmission

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    Conclusion

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    References

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    Index

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    About the Author

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    Colophon

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