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:
Dec. 28, 1993
Filed:
Aug. 30, 1991
James Kardach, San Jose, CA (US);
Cau Nguyen, Milpitas, CA (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
A dedicated memory area is provided on a microprocessor system for storing a customizable system interrupt service routine, and processor state data at the time of interruption. The dedicated memory area is normally not mapped as part of the main memory space, thereby keep it inaccessible to the operating system and applications. An unmaskable system supervisor interrupt having higher priority than all other maskable and unmaskable interrupts is added to the CPU interrupts. The extended memory addressing limits are overridden when the CPU is interrupted by this added interrupt. A RESUME instruction is added to the CPU instructions to provide recovery of the CPU to the state before it was interrupted. The extended memory addressing limits are restored when the CPU is restored by the RESUME instruction. As a result, a system integrator or OEM may provide transparent system level interrupts with integrated extended memory addressing that will operate reliably in any operating environment, and be able to address the entire physical address space and have access to all system resources in a stand alone manner during the interrupt.