Intel iapx 432 manual Looical moE

iAPx 432 Interface Processor Architecture Reference Manual

The IP records fault information in various areas of IP process and processor objects (refer to Appendix A for detailed description of these fault information areas). There are three categories of IP operation in which faults may be generated: physical reference node, logical reference node, and window-mapped data transfer. Each of these modes utilizes specific fault information areas to report faults.

PHYSICAL mOE

Information about faults which occur in physical reference node is recorded in the processor fault infoDmatian area of the IP processor obj ect. The function state is set to "context-level fault" when a physical reference mode fault is encountered am an AP interrupt is generated.

LOOICAL moE

Information about faults which occur in logical reference node is recorded in awropr iate portions of the IP process and processor

objects. Each IP process object contains two fault information

areas: one for context-level fault information and one for process-level fault information. The IP processor object contains a fault informations area for processor-level fault information.

Depending on the severity level (context, process, or processor) of a fault and the current state of the process and processor, an IP selects an area to be used to record the fault information. The method an IP uses to decide the appropriate site to record fault information is shown in Figure 6-1. Successive faults, encountered during fault recording, reflect the fault state to higher levels of severity until, finally, an IP can no longer continue and must issue the FATAL signal (see iAPX 432 VISI Interface Processor Oata Sheet, Order Number 171874).

CATEX;()RIES OF LOOICAL mOE FAULTS

There are three categories of logical node faults, listed in increasing order of severity:

oContext-level faults

o Process-level faults

o Processor-level faults

6-2