Intel iapx 432 manual Establishing AN Executicn Envriooment

iAPX 432 Interface Processor Architecture Reference Manual

An Interface Processor responds to an INIT pulse by aborting any current operation, entering physical reference mode, configuring its windows as shown in table E-l, clear ing broadcast acceptance node, and then issuing an interrupt request to its Attached Processor. The interrupt request signals the IP controller that the Interface Processor has initialized itself and will accept subrange address references, including physical reference node function requests written through window 4. Any attempt by the IP controller (or any active agent in the Peripheral Subsystem) to reference a subrange prior to receiving the IP's interrupt request produces an undefined result. An IP switches from physical to logical reference mode. upon receipt of the startup IPC as defined below.

A General Data Processor responds to an !NIT pulse by aborting any current activity and then waiting in a quiescent state for the startup IPC. The startup IPC is defined as the first local IPC received following an INIT pulse; a GOP will ignore any intervening global IPC.

To surnnarize, shortly after system reset, Attached Processors (and Peripheral Subsystems) will be able to run as desired, IPs will be able to run in physical reference mode, and GOPs will be waiting for a signal to begin execution.

E-2.ESTABLISHING AN EXECUTICN ENVRIOOMENT

Prior to starting any GOP (or switching any IP to logical reference node) an environment in which the processor can execute must be

created in 432 memory. This environment consists of a set of interrelated system objects; a minimal environment, sufficient to start one process running on a GOP, could be character ized as follows:

othe initial object table directory (loaded at physical address 8);

o an object table;

oa processor object; o a dispatching port;

o a process object (queued at the dispatching port).

E-2