anchor.diff:  compatible interrupt controllers. An open PIC interrupt controller
   implements the open PIC architecture (developed jointly by AMD and
   Cyrix) and specified in The Open Programmable Interrupt Controller (PIC)
  -Register Interface Specification Revision 1.2 <<18>>.
  +Register Interface Specification Revision 1.2 <<b18>>.
   
   Interrupt specifiers in an open PIC interrupt domain are encoded with
   two cells. The first cell defines the interrupt number. The second cell
  
positive.code: 
  === References
  [bibliography]
  - [[[1]]] _Power ISA(TM)_, Version 2.06 Revision B, July 23, 2010. It is
    available from power.org (http://power.org)
  
  - [[[2]]] _Boot (Initialization Configuration) Firmware: Core
    Requirements and Practices_, 1994, This is the core standard (also
    known as IEEE 1275) that defines the device tree concept adopted by
    the {spec}. It is available from Global Engineering (http://global.ihs.com/).
  
  - [[[3]]] _PowerPC Processor Binding to IEEE 1275-1994 Standard for Boot
    (Initialization, Configuration) Firmware_, Version 2.1, Open Firmware
    Working Group, (http://playground.sun.com/1275/bindings/ppc/release/ppc-2_1.html),
    1996, This document specifies the PowerPC processor specific binding
    to the base standard.
  
  - [[[4]]] _booting-without-of.txt_, Ben Herrenschmidt, Becky Bruce, et al.,
    From the Linux kernel source tree
    (http://www.kernel.org/), Describes the device tree as used by the Linux kernel.
  
  - [[[5]]] _Device Trees Everywhere_, David Gibson and Ben Herrenschmidt
    (http://ozlabs.org/~dgibson/home/papers/dtc-paper.pdf),
    An overview of the concept of the device tree and device tree compiler.
  
  - [[[6]]] _PCI Bus Binding to: IEEE Std 1275-1994 Standard for Boot
    (Initialization Configuration) Firmware_, Revision 2.1,
    Open Firmware Working Group, 1998
    (http://playground.sun.com/1275/bindings/pci/pci2_1.pdf)
  
  - [[[7]]] _Open Firmware Recommended Practice: Interrupt Mapping_, Version 0.9,
    Open Firmware Working Group, 1996
    (http://playground.sun.com/1275/practice/imap/imap0_9d.pdf)
  
  - [[[8]]] _Open Firmware Recommended Practice: Device Support Extensions_, Version 1.0,
    Open Firmware Working Group, 1997,
    (http://playground.sun.com/1275/practice/devicex/dse1_0a.html)
    This document describes the binding for various device types such as
    network, RTC, keyboard, sound, etc.
  
  - [[[9]]] _Open Firmware Recommended Practice: Universal Serial Bus
    Binding to IEEE 1275_, Version 1,
    Open Firmware Working Group, 1998
    (http://playground.sun.com/1275/bindings/usb/usb-1_0.ps)
  
  - [[[10]]] _PowerPC Microprocessor Common Hardware Reference Platform (CHRP)
    Binding_, Version 1.8,
    Open Firmware Working Group, 1998
    (http://playground.sun.com/1275/bindings/chrp/chrp1_8a.ps).
    This document specifies the properties for Open PIC-compatible
    interrupt controllers.
  
  - [[[11]]] _CHRP ISA Interrupt Controller Device Binding_,
    Unapproved Draft version 1.1,
    Open Firmware Working Group, Aug 19, 1996
    (http://playground.sun.com/1275/bindings/devices/postscript/isa-pic-1_1d.ps)
  
  - [[[12]]] _The Open Programmable Interrupt Controller (PIC) Register
    Interface Specification_, Revision 1.2,
    Advanced Micro Devices and Cyrix Corporation, October 1995
  
  - [[[13]]] _PCI Local Bus Specification_, Revision 2.2, PCI Special Interest Group
  - [[[14]]] _PCI Express Base Specification_, Revision 1.0a, PCI Special Interest Group
  - [[[15]]] _PCI-Express Binding to OF_, P1275 Openboot Working Group Proposal, 18 August 2004
  - [[[16]]] _Power.org Standard for Power Architecture Platform Requirements_, power.org
  
  - [[[17]]] _System V Application Binary Interface, Edition 4.1_,
    Published by The Santa Cruz Operation, Inc., 1997
  
  - [[[18]]] _The Open Programmable Interrupt Controller (PIC) Register
    Interface Specification Revision 1.2_, AMD and Cyrix, October 1995
  
  - [[[19]]] _RFC 2119, Key words for use in RFCs to Indicate Requirement
    Levels_, http://www.ietf.org/rfc/rfc2119.txt
  
  - [[[20]]] _64-bit PowerPC ELF Application Binary Interface Supplement
    1.9_, Ian Lance Taylor, 2004
  
  === Definition of Terms
  
negative.code: 
  === Variable Address Image Format
  This {spec} image format is a constrained form of ELF (Executable and
  Linking Format, see <<b17>>) executable. That is, an {spec} client image
  shall be a valid ELF file, but also has additional requirements
  described in the next sections.
  
  