Linking program access register number with millicode operand ac

Details Linking program access register number with millicode operand ac Linking program access register number with millicode operand ac

1995-03-31

1998-01-27

Bowler, Alyssa H.

395401, 395410, G06F 1200

Patent

active

057130353

ABSTRACT:
In a milli-mode processor, bits (0-6) of an access list entry token (ALET) in the program access register must be zeros in order for access register translation to be successful. When the ALET is being copied from a program access register to a millicode access register, bits 0-3 of ALET, written into the millicode access register, are set to the access register number of the program access register from which the data is being read. This establishes the affinity between the program access register number and any logical fetches which might be attempted by millicode.

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IBM/TDB vol. 35 Nov. 4A Sep. 1992; 451-454: Milli-code (Bullion, Chang, Meltzer, Nadas, Pedersen).

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