Method and apparatus for saving a system image onto permanent st

Details Method and apparatus for saving a system image onto permanent st Method and apparatus for saving a system image onto permanent st

1993-10-20

1994-08-16

Kriess, Kevin A.

Boots, shoes, and leggings

3642302, 364DIG1, 3642808, G06F 1206, G01R 3128

Patent

active

053394372

ABSTRACT:
At least one storage parameter table is initialized to reserve an area of permanent storage for saving a system image. The reserved area is not formatted by the operating system for general use storage. Additionally, a system management mode (SMM), a dedicated system management memory (SMRAM), a system management interrupt (SMI), an SMI service routine, a Resume instruction (RSM), various mechanism for triggering an SMI, and various mechanisms for triggering an RSM event are provided. Together, these elements allow system management functions to be performed in a manner that is transparent to the operating system and applications. Furthermore, a suspend mode, various suspend levels including a zero volt suspend, a suspend handler, various suspend request delay timers, various mechanisms for triggering a suspend request and various mechanisms for triggering a resume event while in suspend mode are also provided. The suspend handler is provided as part of the SMI service routine. In particular, the suspend handler saves a system image onto the reserved area before shutting off the power from all of the components, excluding the real time clock and the logic, for resuming execution when processing a zero volt suspend request. As a result, a system image may be saved onto permanent storage in a manner that is operating system independent.

REFERENCES:
patent: 5175853 (1992-12-01), Kardach et al.

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