Hardware retry trap for millicoded processor

Details Hardware retry trap for millicoded processor Hardware retry trap for millicoded processor

1995-03-31

1997-09-30

Beausoliel, Jr., Robert W.

39518221, 395376, 395800, G06F 1134

Patent

active

056733917

ABSTRACT:
Retry trap in the processor system detects the occurrence of a hardware retry during a millicode routine. In operation, millicode resets the retry trap to "O" at the start of a millicode sequence that is sensitive to a retry operation being at some stage of the millicode sequence. The millicode routine tests the retry latch state at one or more points in the sequence to determine if a retry has occurred since the start of the sequence, which is sensitive to a retry operation. The action taken in response to a determination that a retry operation has occurred depends upon the type of potential damage to the system state as a result of the occurrence of the retry operation during the millicode sequence.

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IBM/TDB vol. 35 No. 4A Sep. 1992 -Milli-Code: Bullions, Chang, Meltzer, Nadas, Pedersen.

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