Transparent system interrupts with integrated extended memory ad

Details Transparent system interrupts with integrated extended memory ad Transparent system interrupts with integrated extended memory ad

1991-08-30

1993-12-28

Eng, David Y.

Boots, shoes, and leggings

395725, 395650, 395425, 3642416, 364941, G06F 1324

Patent

active

052748340

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.

REFERENCES:
patent: 3577185 (1971-05-01), Belady
patent: 3594732 (1971-07-01), Mendelson
patent: 4434462 (1984-02-01), Guttag
patent: 4519032 (1985-05-01), Mendell
patent: 4591975 (1986-05-01), Wade

Affiliated with

Also associated with

Rating

Transparent system interrupts with integrated extended memory ad does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transparent system interrupts with integrated extended memory ad, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transparent system interrupts with integrated extended memory ad will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1551368