I/O hub resident cache line monitor and device register update

Details I/O hub resident cache line monitor and device register update I/O hub resident cache line monitor and device register update

2004-12-29

2009-08-25

Tsai, Henry W. H. (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

C711S141000, C711S142000

Reexamination Certificate

active

07581042

ABSTRACT:
The apparatus and method described herein are for enabling cacheable writes to I/O device registers. A cache monitor, which may be present in a controller hub, monitors accesses to cache lines in a microprocessor. The cache monitor also associates cache lines in the microprocessor with I/O device registers. When an access to certain cache lines are detected, the cache monitor is operable to receive the contents of the cache line and write those contents to an associated I/O device register. Therefore, a microprocessor may write to a cache line, instead of making an uncacheable write to the I/O device register directly.

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