Method and apparatus for allocating use of an access device between host and guest operating systems
US6966062B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2001 |
| Grant date | Nov 15, 2005 |
| Priority date | — |
| Expiry date | Jul 5, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/45537
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method, apparatus and article of manufacture for allocating use of an access device between a host operating system and a guest operating system. In one embodiment, a source of the received request to use the access device is determined as either the host operating system or the guest operating system. A determination of whether the host or guest operating system has a key for the access device is performed. The key enables either the host operating system or the guest operating system to use the access device. A determination of whether the received request is an altering request to change a state of the access device or a passive request to read the access device is also performed. The processing of the request from the host and guest operating systems is similar except when the request is an altering request and neither the host operating system nor the guest operating system has the key. In this case, the request from the host operating system is passed and the request from the guest operating system is rejected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.