Operation system independent polled interface for extension BIOS (XBIOS) operations
US5694582A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1996 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Jan 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/57
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
System management mode (SMM) is utilized, despite operating system security measures, by furnishing a polled interface for SMM. When an application program is to make an XBIOS call, the application program posts an XBIOS request in a storage. SMM is activated periodically by a timer and, during activation, checks the storage for XBIOS requests. When an XBIOS request is posted, SMM processes the request XBIOS command and leaves a response from the XBIOS call in the storage. The application program, which continually loops, monitors the storage and detects replacement of the XBIOS request by the XBIOS result to realize completion of an XBIOS call.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.