FreeBSD Architecture Handbook
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Chapter 10 ISA Device Drivers

Table of Contents
10.1 Synopsis
10.2 Basic Information
10.3 device_t Pointer
10.4 Configuration File and the Order of Identifying and Probing During Auto-Configuration
10.5 Resources
10.6 Bus Memory Mapping
10.7 DMA
10.8 xxx_isa_probe
10.9 xxx_isa_attach
10.10 xxx_isa_detach
10.11 xxx_isa_shutdown
10.12 xxx_intr
Written by Sergey Babkin. Modifications for Handbook made by Murray Stokely, Valentino Vaschetto, and Wylie Stilwell.

10.1 Synopsis

This chapter introduces the issues relevant to writing a driver for an ISA device. The pseudo-code presented here is rather detailed and reminiscent of the real code but is still only pseudo-code. It avoids the details irrelevant to the subject of the discussion. The real-life examples can be found in the source code of real drivers. In particular the drivers ep and aha are good sources of information.

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