Method and apparatus for extending BIOS control of screen display beyond operating system boot process
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United States of America Patent
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Nov 5, 2002
Grant Date -
N/A
app pub date -
Jun 18, 1999
filing date -
Jun 18, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for extending basic input output system (BIOS) control of the display screen beyond the loading of the operating system is described. In one embodiment, the BIOS, during power-on self test (POST), writes content to the display screen, redirects a video controller interrupt vector to a new handler, and traps I/O accesses to the video controller. During the time the operating system is starting, accesses to the video controller, through the interrupt vector or directly, is intercepted and/or redirected. Once the operating is loaded, the original interrupt vector is restored, and trapping of I/O accesses to the video controller is disabled, allowing the operating system to take control of the video controller and hence the display screen.
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