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Writing Device Drivers     Oracle Solaris 10 1/13 Information Library
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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

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 Solaris DDI/DKI Services

C.  Making a Device Driver 64-Bit Ready

D.  Console Frame Buffer Drivers

Solaris Consoles and the Kernel Terminal Emulator

x86 Platform Console Communication

SPARC Platform Console Communication

Console Visual I/O Interfaces

I/O Control Interfaces

Polled I/O Interfaces

Video Mode Change Callback Interface

Implementing the Visual I/O Interfaces in Console Frame Buffer Drivers








Implementing Polled I/O in Console Frame Buffer Drivers

Frame Buffer Specific Configuration Module

The X Window System Frame Buffer Specific DDX Module

Developing, Testing, and Debugging Console Frame Buffer Drivers

Testing the I/O Control Interfaces

Testing the Polled I/O Interfaces

Testing the Video Mode Change Callback Function

Additional Suggestions for Testing Console Frame Buffer Drivers

E.  pci.conf File


Developing, Testing, and Debugging Console Frame Buffer Drivers

Debugging a console frame buffer driver on an active system can be problematic.

This section offers some suggestions to help you develop, test, and debug console frame buffer drivers.

Testing the I/O Control Interfaces

To test the ioctl commands, create additional ioctl entry points that are callable from a user application. Be sure to copy in the arguments appropriately. Use the ddi_copyin(9F) and ddi_copyout(9F) routines to transfer data to and from user address space. Then write an application to validate rendering, scrolling, and cursor behavior. This way, these ioctl commands do not affect your console while you develop and test the commands.

To ensure that the ioctl commands are working correctly, boot the system and log in. Check whether you get expected behavior when you execute commands such as prstat(1M), ls(1), vi(1), and man(1).

Execute the following script to validate that ANSI color is working correctly:

printf "\n\n\n\e[37;40m             Color List       \e[m\n\n"
printf "\e[30m Color 30 black\e[m\n"
printf "\e[31m Color 31 red\e[m\n"
printf "\e[32m Color 32 green\e[m\n"
printf "\e[33m Color 33 yellow\e[m\n"
printf "\e[34m Color 34 blue\e[m\n"
printf "\e[35m Color 35 purple\e[m\n"
printf "\e[36m Color 36 cyan\e[m\n"
printf "\e[37m Color 37 white\e[m\n\n"
printf "\e[40m Backlight 40 black \e[m\n"
printf "\e[41m Backlight 41 red   \e[m\n"
printf "\e[34;42m Backlight 42 green \e[m\n"
printf "\e[43m Backlight 43 yellow\e[m\n"
printf "\e[37;44m Backlight 44 blue  \e[m\n"
printf "\e[45m Backlight 45 purple\e[m\n"
printf "\e[30;46m Backlight 46 cyan  \e[m\n"
printf "\e[30;47m Backlight 47 white \e[m\n\n"

Testing the Polled I/O Interfaces

The polled I/O interfaces are only available under the following circumstances:

The polled I/O interfaces only become available at a certain point in the boot process. Polled I/O requests issued from the OpenBoot PROM before the system is running are not rendered. Similarly, kmdb prompts issued before the console is configured are not rendered.

To test the polled I/O interfaces, enter the OpenBoot PROM by using the L1+A keystroke sequence. To validate that the polled I/O interfaces are being used, type the following command at the OpenBoot PROM ok prompt:

ok 1b emit ." [32m This is a test" 1b emit ." [m"

The polled I/O interfaces are working properly if the following statements are true:

Testing the Video Mode Change Callback Function

To determine whether the video mode change callback function is working properly, log in to the system and use fbconfig(1M) to change the resolution and depth of the frame buffer several times. If the console continues to display text properly, the video mode change callback function is working correctly. The kernel terminal emulator might adjust the font size to accommodate different screen sizes, but that is not significant to the console frame buffer driver.

To determine whether the X Window System and the console frame buffer driver interact correctly, switch between the X Window System and the command line several times while modifying the X Window System's video resolution and the command line resolution in different ways. If the X Window System exits and the console characters are not displayed correctly, either the X Window System did not notify the driver console code that the video mode changed or the driver did not call the kernel terminal emulator's video mode change callback function.

Additional Suggestions for Testing Console Frame Buffer Drivers

During boot, the system sends messages to /var/adm/messages if the system fails to locate or successfully load a kernel terminal emulator compatible frame buffer driver. To monitor these messages, type the following command in a separate window:

% tail -f /var/adm/messages

To avoid problems with USB while debugging the driver, change the EEPROM input-device NVRAM configuration parameter to use a serial port instead of the keyboard. See the eeprom(1M) man page for more information about this parameter.