Method and apparatus for providing system security to personal computer systems using transparent system interrupt
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United States of America Patent
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Mar 3, 1998
Grant Date -
N/A
app pub date -
Sep 28, 1995
filing date -
Sep 28, 1995
priority date (Note) -
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Abstract
A transparent system management interrupt (SMI) handler equipped with system security functions is provided to a personal computer (PC) for providing system security to the PC. Additionally, the keyboard controlling facility of the PC is enhanced to cooperate with the SMI handler to deliver system security under the direction of the SMI handler. The SMI handler's system security functions include a number of functions for handling a number of security related events detected by the keyboard controlling facility. The keyboard controlling facility is enhanced to operate in one of three modes, a normal mode, a sleuth mode, and a secured mode, under which the keyboard controlling facility allows 'unrestricted' keyboard operations, communicates exclusively with the SMI handler, and allows only 'restricted' keyboard operations respectively.
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