Computer system for reading/writing system configuration using I

Details Computer system for reading/writing system configuration using I Computer system for reading/writing system configuration using I

1997-01-27

1999-10-05

Kriess, Kevin A.

395734, G06F 940

Patent

active

059637382

ABSTRACT:
When a BIOS driver call request is generated in an environment of an OS operating in a protect mode, an IN or OUT instruction is executed to cause an I/O trap SMI generator to generate an I/O trap SMI. The mode of a CPU is switched from the protect mode to an SMM in accordance with the I/O trap SMI. In the SMM, the BIOS driver is executed. When the process of the BIOS driver is completed, the mode of the CPU is returned from the SMM to the protect mode, thereby shifting control to the OS. The BIOS can be directly called in the protect mode without building a routine for switching the CPU operating mode in the OS or application program operating in the protect mode.

REFERENCES:
patent: 5175853 (1992-12-01), Kardach et al.
patent: 5276888 (1994-01-01), Kardach et al.
patent: 5276890 (1994-01-01), Arai
patent: 5339437 (1994-08-01), Yuen
patent: 5437039 (1995-07-01), Yuen
patent: 5459869 (1995-10-01), Spilo
patent: 5613135 (1997-03-01), Sakai et al.
patent: 5630147 (1997-05-01), Datta et al.

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