Read only store as part of cache store for storing frequently us

Details Read only store as part of cache store for storing frequently us Read only store as part of cache store for storing frequently us

1995-05-31

1997-04-29

Treat, William M.

395381, G06F 922

Patent

active

056258089

ABSTRACT:
A read only storage (ROS) array holds a small set of relatively simple millicode instructions; those millicode instruction routines which are most commonly called on in executing common application workloads. The millicode read only store is implemented as a portion of hardware system area (HSA) storage. The cache control includes a register which contains hardware system area address corresponding to the read only store address. When an instruction fetch request is received by the cache control, the absolute address of the instruction fetch request is compared with the read only store address in the register in parallel with the normal cache directory lookup. If the instruction fetch request matches the read only store address, the fetch is made from the read only store independently of the directory lookup result.

REFERENCES:
patent: 4691277 (1987-09-01), Kronstadt et al.
patent: 4751703 (1988-06-01), Picon et al.
patent: 5072364 (1991-12-01), Jardine
patent: 5109495 (1992-04-01), Fite et al.
patent: 5226130 (1993-07-01), Favor et al.

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