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5.3 Machine Checks/Interrupts

The exceptions that result from hardware system errors are called machine

checks/interrupts. They occur when a system error is detected during the processing of

a data request.

During the error-handling process, errors are first handled by the appropriate PALcode error

routine and then by the associated operating system error handler. PALcode transfers

control to the operating system through the PAL handler.

Table 5–2 lists the machine checks/interrupts that are related to error events. The

designations – 630, 670, 620, 660, and 680 – indicate a system control block (SCB) offset to

the fatal system error handler for Tru64 UNIX and OpenVMS.

Table 5–2 Machine Checks/Interrupts

Error Type Error Descriptions

CPU Correctable Error (630)

Generic Alpha 21264C

(EV68) correctable errors.

B-cache probe hit single-bit ECC error

D-cache tag parity error on issue

I-cache tag or data parity error

D-cache victim single-bit ECC error

B-cache single-bit ECC fill error to I-stream or D-stream

Memory single-bit ECC fill error to I-stream or D-stream

CPU Uncorrectable Error

(670)

Fatal microprocessor

machine check errors that

result in a system crash.

PAL detected bugcheck error

Operating system detected bugcheck error

EV68 detected second D-cache store EEC error

EV68 detected D-cache tag parity error in pipeline 0 or 1

EV68 detected duplicate D-cache tag parity error

EV68 detected double-bit ECC memory fill error

EV68 detected double-bit probe hit EEC error

EV68 detected B-cache tag parity error

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HP Digital AlphaStation 255 Family Technical Information Seite 176