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Pause Control Byte

IP.com Disclosure Number: IPCOM000103780D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 34K

Publishing Venue

IBM

Related People

Spengler, GL: AUTHOR

Abstract

A Pause Control Byte has been defined in the SigP Control Word. The Processor Controller sets a bit in the Pause Control Byte to designate which CP microcode assist is to be run before actually pausing, or before exiting the pause state. The Processor Controller then requests the Pause State. The CP Fetches the SigP Control Word in order to post the Pause State. It also examines those Pause Control bits that are defined for a pre-pause assist, and if one of the bits is on, that assist is executed. The Pause State is then entered.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Pause Control Byte

      A Pause Control Byte has been defined in the SigP Control Word.
The Processor Controller sets a bit in the Pause Control Byte to
designate which CP microcode assist is to be run before actually
pausing, or before exiting the pause state.  The Processor Controller
then requests the Pause State.  The CP Fetches the SigP Control Word
in order to post the Pause State.  It also examines those Pause
Control bits that are defined for a pre-pause assist, and if one of
the bits is on, that assist is executed.  The Pause State is then
entered.

      While the CP is in the Pause State, the PC will perform its
portions of the needed function.  This may include any of the current
assists executed via CSAR Transfers.  The PC then requests the CP to
exit the Pause State.

      As the CP microcode begins to exit the Pause State, it again
fetches SigP Control Word and examines the bits in the Pause Control
Byte.  The assists defined for the bits found on will be executed
prior to exiting the Pause State.  The CP microcode then rests the
Pause Control Byte and exits the Pause State.

      Disclosed anonymously.