The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 2004
Filed:
Jan. 03, 2000
Charles Weldon Mitchell, Austin, TX (US);
Qadeer Ahmad Qureshi, Round Rock, TX (US);
Dervinn Deyual Caldwell, Fremont, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A processor includes an input/output (I/O) register that is mapped into input/output (I/O) address space. The processor also includes a base address register that is loaded with a base address. The base address register may be a model specific register (MSR). The input/output register is accessed with an input/output instruction at an address determined according to the base address and an offset therefrom. The base address register may be accessible to software operating at a high privilege level and not accessible to software operating at a lower privilege level, while the I/O register is accessible to software operating at the lower privilege level. The processor determines when an I/O access is to the processor I/O register and accesses that I/O register without causing an input/output bus cycle that would otherwise occur.