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PCI Interrupts for x86 Machines under FreeBSD

A guide for interrupt programming under Unix

(by john h. baldwin)

A 17 page intro on 8259 Interrupt Controller programming under Unix, using FreeBSD. It contains assembly code samples and DMA Chipset schemas.
This article is online from 2280 days and has been seen 10195 times




(***download for full text***)

PCI Interrupts for x86 Machines under FreeBSD
John H. Baldwin
Yahoo!, Inc. - Atlanta, GA 30327
http://people.FreeBSD.org/˜jhb - jhb@FreeBSD.org

1 Introduction
2 Legacy PCI INTx Interrupts
3 Interrupts on x86 CPUs
4 Interrupt Controllers (Stuff in the Middle)
4.1 8259A Master and Slave PICs (PC-AT)
4.2 Programmable Interrupt Routers (PCI Link Devices)
4.3 I/O APICs
5 PCI Interrupt Routing (Navigating the Maze)
5.1 PCI-PCI Bridge Swizzle
5.2 Routing via $PIR
5.2.1 The $PIR Table
5.2.2 FreeBSD’s $PIR Implementation
5.3 Routing via the MP Table
5.4 Routing via ACPI
5.4.1 Global System Interrupts
5.4.2 The PIC Method
5.4.3 PCI Interrupt Link Devices
5.4.4 PRT Methods
6 FreeBSD’s INTx Implementation
6.1 IRQs are Yummy Cookies
6.2 IDT Vectors on x86
7 PCI Message Signaled Interrupts
8 FreeBSD’s MSI Implementation
9 Conclusion
10 Acknowledgments
11 Availability

Abstract
An important element in computers with multiple autonomous devices is the 
ability of a device to notify the CPU that it needs attention via an 
interrupt. The OS visible mechanics of interrupts for PCI devices is
quite convoluted, especially on x86 PC systems. 

This paper will cover the various ways that PCI INTx interrupts have been 
implemented on x86 as well as the methods used by the system BIOS to 
communicate the implementation to operating systems. It will also cover 
the newer Message Signaled Interrupts that address some of the limitations 
of INTx interrupts. Finally, the paper will provide an overview of 
FreeBSD’s implementation of both INTx and MSI interrupts on the x86 platform.

(***download for full text***)



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