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Writing Device Drivers
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Part I Designing Device Drivers for the Solaris Platform

1.  Overview of Solaris Device Drivers

2.  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

Power Management Framework

Device Power Management

System Power Management

Device Power Management Model

Power Management Components

Multiple Power Management Components

Power Management States

Power Levels

Power Management Dependencies

Automatic Power Management for Devices

Device Power Management Interfaces

Busy-Idle State Transitions

Device Power State Transitions

power() Entry Point

System Power Management Model

Autoshutdown Threshold

Busy State

Hardware State

Automatic Power Management for Systems

Entry Points Used by System Power Management

detach() Entry Point

attach() Entry Point

Power Management Device Access Example

Power Management Flow of Control

Changes to Power Management Interfaces

13.  Hardening Solaris Drivers

14.  Layered Driver Interface (LDI)

Part II Designing Specific Kinds of Device Drivers

15.  Drivers for Character Devices

16.  Drivers for Block Devices

17.  SCSI Target Drivers

18.  SCSI Host Bus Adapter Drivers

19.  Drivers for Network Devices

20.  USB Drivers

Part III Building a Device Driver

21.  Compiling, Loading, Packaging, and Testing Drivers

22.  Debugging, Testing, and Tuning Device Drivers

23.  Recommended Coding Practices

Part IV Appendixes

A.  Hardware Overview

B.  Summary of Solaris DDI/DKI Services

C.  Making a Device Driver 64-Bit Ready

D.  Console Frame Buffer Drivers


Changes to Power Management Interfaces

Prior to the Solaris 8 release, power management of devices was not automatic. Developers had to add an entry to /etc/power.conf for each device that was to be power-managed. The framework assumed that all devices supported only two power levels: 0 and standard power.

Power assumed an implied dependency of all other components on component 0. When component 0 changed to level 0, a call was made into the driver's detach(9E) with the DDI_PM_SUSPEND command to save the hardware state. When component 0 changed from level 0, a call was made to the attach(9E) routine with the command DDI_PM_RESUME to restore hardware state.

The following interfaces and commands are obsolete, although they are still supported for binary purposes:

Since the Solaris 8 release, devices that export the pm-components property automatically use power management if autopm is enabled.

The framework now knows from the pm-components property which power levels are supported by each device.

The framework makes no assumptions about dependencies among the different components of a device. The device driver is responsible for saving and restoring hardware state as needed when changing power levels.

These changes enable the power management framework to deal with emerging device technology. Power management now results in greater power savings. The framework can detect automatically which devices can save power. The framework can use intermediate power states of the devices. A system can now meet energy consumption goals without powering down the entire system and without any functions.

Table 12-1 Power Management Interfaces

Removed Interfaces
Equivalent Interfaces