Method and circuitry for saving and restoring status information

Details Method and circuitry for saving and restoring status information Method and circuitry for saving and restoring status information

1994-12-05

1996-08-13

Kriess, Kevin A.

Boots, shoes, and leggings

3642318, 3642656, 364DIG1, 395600, G06F 938

Patent

active

055465510

ABSTRACT:
A method and circuitry for handling status information in a computer is described. If there are additional pipeline states to restore, then a first operation is executed. All traps are disabled for a next advancement of the pipeline. A first logical value is stored into an update bit position associated with a first stage of the pipeline. A value is stored into a status bit position associated with the first stage of the pipeline. If the value of the update bit is not associated with the last stage of the pipeline, then the pipeline is advanced by one stage. The value of the update bit position is propagated unchanged to a next stage of the pipeline and becomes associated with that stage of the pipeline. The value of the status bit position is propagated unchanged to the next stage of the pipeline and becomes associated with that stage of the pipeline. If the value of the update bit is not associated with the last stage of the pipeline, then the above steps are repeated.

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J. Crawford and P. Gelsinger, Programming the 80386, pp. 553-589 (Sybex Inc. 1987).
Vol. I (Microprocessor) of Microprocessor and Peripheral Handbook, Intel Corp., pp. 4-1 through 4-128 (Oct. 1987).

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