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Writing Device Drivers     Oracle Solaris 11.1 Information Library
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Preface

Part I Designing Device Drivers for the Oracle Solaris Platform

1.  Overview of Oracle Solaris Device Drivers

2.  Oracle Solaris Kernel and Device Tree

3.  Multithreading

4.  Properties

5.  Managing Events and Queueing Tasks

6.  Driver Autoconfiguration

7.  Device Access: Programmed I/O

8.  Interrupt Handlers

9.  Direct Memory Access (DMA)

10.  Mapping Device and Kernel Memory

11.  Device Context Management

12.  Power Management

13.  Hardening Oracle Solaris Drivers

14.  Layered Driver Interface (LDI)

Part II Designing Specific Kinds of Device Drivers

15.  Drivers for Character Devices

Overview of the Character Driver Structure

Character Device Autoconfiguration

Device Access (Character Drivers)

open() Entry Point (Character Drivers)

close() Entry Point (Character Drivers)

I/O Request Handling

User Addresses

Vectored I/O

Differences Between Synchronous and Asynchronous I/O

Data Transfer Methods

Programmed I/O Transfers

DMA Transfers (Synchronous)

DMA Transfers (Asynchronous)

minphys() Entry Point

strategy() Entry Point

Mapping Device Memory

Multiplexing I/O on File Descriptors

Miscellaneous I/O Control

ioctl() Entry Point (Character Drivers)

I/O Control Support for 64-Bit Capable Device Drivers

Handling copyout() Overflow

32-bit and 64-bit Data Structure Macros

How Do the Structure Macros Work?

When to Use Structure Macros

Declaring and Initializing Structure Handles

Operations on Structure Handles

Other Operations

16.  Drivers for Block Devices

17.  SCSI Target Drivers

18.  SCSI Host Bus Adapter Drivers

19.  Drivers for Network Devices

20.  USB Drivers

21.  SR-IOV Drivers

Part III Building a Device Driver

22.  Compiling, Loading, Packaging, and Testing Drivers

23.  Debugging, Testing, and Tuning Device Drivers

24.  Recommended Coding Practices

Part IV Appendixes

A.  Hardware Overview

B.  Summary of Oracle Solaris DDI/DKI Services

C.  Making a Device Driver 64-Bit Ready

D.  Console Frame Buffer Drivers

E.  pci.conf File

Index

Mapping Device Memory

Some devices, such as frame buffers, have memory that is directly accessible to user threads by way of memory mapping. Drivers for these devices typically do not support the read(9E) and write(9E) interfaces. Instead, these drivers support memory mapping with the devmap(9E) entry point. For example, a frame buffer driver might implement the devmap(9E) entry point to enable the frame buffer to be mapped in a user thread.

The devmap(9E) entry point is called to export device memory or kernel memory to user applications. The devmap() function is called from devmap_setup(9F) inside segmap(9E) or on behalf of ddi_devmap_segmap(9F).

The segmap(9E) entry point is responsible for setting up a memory mapping requested by an mmap(2) system call. Drivers for many memory-mapped devices use ddi_devmap_segmap(9F) as the entry point rather than defining their own segmap(9E) routine.

See Chapter 10, Mapping Device and Kernel Memory and Chapter 11, Device Context Management for details.