Cache extension to processor local storage

Details Cache extension to processor local storage Cache extension to processor local storage

1981-06-15

1983-10-18

Nusbaum, Mark E.

Boots, shoes, and leggings

G06F 1300

Patent

active

044109466

ABSTRACT:
The disclosure pertains to a relatively small local storage (LS) in a processor's IE which can be effectively expanded by utilizing a portion of a processor's store-in-cache. The cache allocates a line (i.e. block) for LS use by the instruction unit sending a special signal with an address for a line in a special in main storage which is non-program addressable (i.e. not addressable by any of the architected instructions of the processor). The special signal suppresses the normal line fetch operation of the cache from main storage caused when the cache does not have a requested line. After the initial allocation of the line space in the cache to LS use, the normal cache operation is again enabled, and the LS line can be castout to the special area in main storage and be retrieved therefrom to the cache for LS use.

REFERENCES:
patent: 3657705 (1972-04-01), Mekota et al.
patent: 3701977 (1972-10-01), Mendelson et al.
patent: 4084234 (1978-04-01), Calle et al.
patent: 4208716 (1980-06-01), Porter et al.
patent: 4310879 (1982-01-01), Pandeya
Caspers et al., "Cache-Resident Processor Registers", IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979.

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