Detecting transfer of Universal Serial Bus (USB) Host Controller information from operating system drivers to Basic Input Output System (BIOS)

A first driver bypasses execution of a transaction descriptor that causes a non-maskable interrupt (NMI) when executed by a host controller while under control of a second driver. The transaction descriptor is pointed to by an entry in a frame list. The host controller has a plurality of host contro...

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1. Verfasser: Nalawadi, Rajeev
Format: Patent
Sprache:eng
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Zusammenfassung:A first driver bypasses execution of a transaction descriptor that causes a non-maskable interrupt (NMI) when executed by a host controller while under control of a second driver. The transaction descriptor is pointed to by an entry in a frame list. The host controller has a plurality of host controller registers including a frame list base address register defining a base address of the frame list and a frame number register addressing the entry.