System and method for preventing an operating-system...

Details System and method for preventing an operating-system... System and method for preventing an operating-system...

2006-04-17

2010-06-08

Lee, Thomas (Department: 2116)

Electrical computers and digital processing systems: support

Reconfiguration

C713S001000, C713S002000, C710S260000, C710S261000, C710S262000, C710S263000, C710S264000, C710S265000, C710S266000, C710S267000, C710S268000, C710S269000

Reexamination Certificate

active

07734905

ABSTRACT:
System and methods for preventing an operating-system scheduler in a computer system from crashing as a result of an uncleared periodic interrupt are disclosed. A periodic interrupt is generated using a real-time clock (RTC) residing on a chipset. A flag indicating a periodic interrupt is entered into a status register associated with the RTC in firmware residing on the CMOS chip, if the status register indicates no periodic interrupt has been pending. An interrupt handler associated with the RTC attempts to handle the periodic interrupt, if pending. If the periodic interrupt is pending after a preset interval of time elapses, a basic-input-output system (BIOS) residing on a memory unit coupled to the chipset generates a system-management interrupt (SMI). If the periodic interrupt is pending after the preset interval of time elapses, a firmware SMI handler residing on the memory unit clears the pending periodic interrupts from the status register. A scheduler timer associated with the operating system is updated.

REFERENCES:
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patent: 5854908 (1998-12-01), Ogilvie et al.
patent: 6038629 (2000-03-01), Ogilvie et al.
patent: 7350117 (2008-03-01), Garcia
patent: 2003/0079007 (2003-04-01), Merkin
patent: 2005/0229179 (2005-10-01), Ballantyne

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