Automated Presentation of directory hardware/GIO_DRVR4.0.5/

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README file from "GIO_DRVR4.0.5" directory 


                  README for toolbox/hardware/GIO_DRVR4.0.5


                       GIO Device Driver Writing Guide

  

    The files in this directory contain information needed to write a device
    driver for a GIO board.  All of the information included in this 
    directory is based on IRIX 4.0.x.  Information on how to write a GIO 
    driver for IRIX 5.x will be included in the next version of the "IRIX 
    Device Driver Programming Guide" document.

    The files in this directory are:

    gio_4.ps    A postscript file of the chapter "Writing Kernel Level
                GIO Device Drivers for IRIX 4.0.x".  This is a 26 page
                document intended as an addition to the existing "IRIX
                Device Driver Programming Guide".  It contains a 
                description of the specific needs of a GIO device driver
                and includes segments of source code as examples.  

                The chapter has sections addressing the following 
                topics:

                    *  Determining GIO Device Addresses

                    *  Including GIO Device Drivers in the Kernel

                    *  Writing edtinit()

                    *  GIO-Specific System Calls

                    *  GIO Interrupt Handler

                    *  Programmed I/O (PIO)

                    *  DMA Operations

                    *  GIO Devices with Hardware Supported Scatter-
                       Gather Capability

                    *  DMA on GIO Devices with No Scatter-Gather
                       Capability

                    *  Device Driver Example 
                
                The device driver example is for a mythical (i.e. non-
                existent) device.  Even though the example is for a 
                non-existent device, it does compile cleanly.  It can 
                be used as a starting point for creating your own GIO 
                device driver.   


    gio_4.txt   This file is an ascii text version of the GIO device 
                driver chapter.  


    gbd.c       This is the example source code for the driver documented
                in the chapter.  Consult the chapter for instructions on
                how to compile this code.
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