Gate-a20 and cpu reset circuit for microprocessor-based system

Details Gate-a20 and cpu reset circuit for microprocessor-based system Gate-a20 and cpu reset circuit for microprocessor-based system

G - Physics

06

F

G06F 1/24 (2006.01)

Patent

CA 2202156

A computer system (100) includes a chipset (120) which controls the gate-A20 signal and the CPU RESET signal in a conventional manner in response to commands from a system microprocessor (112). The computer system (100) further includes a peripheral controller (230) which is programmed to generate an alternative gate-A20 signal and an alternative CPU RESET signal when the peripheral controller (230) has been commanded do override the corresponding signals form the chipset (120). Two signal selectors (272, 276) controlled by the peripheral controller (230) select either the gate-A20 signal and the CPU RESET signal from the chipset (120) or the alternative gate-A20 and the alternative CPU RESET signal for the peripheral controller (230) as respective outputs to control operations of the computer system (100). The use of the alternative signals permits certain operations of the computer system (100) to be directly controlled by an application program without being intercepted by the operating system.

Selon la présente invention, un système informatique (100) est constitué d'un ensemble de microcircuits (120) qui commande conventionnellement le signal A20 de porte et le signal CPU RESET en réaction à des instructions en provenance d'un microprocesseur système (112). Le système informatique (100) comporte en outre un contrôleur de périphériques (230) programmé pour générer un signal A20 de porte de remplacement et un signal CPU RESET de remplacement lorsque le contrôleur de périphériques (230) a reçu l'instruction d'ignorer les signaux correspondants en provenance de l'ensemble de microcircuits (120). Deux sélecteurs de signaux (272, 276) commandés par le contrôleur de périphériques (230) sélectionnent soit le signal A20 de porte et le signal CPU RESET en provenance de l'ensemble de microcircuits (120), soit le signal A20 de porte de remplacement et le signal CPU RESET de remplacement destinés au contrôleur de périphériques, pour que ces signaux fassent office des sorties devant commander des opérations respectives d'un système informatique. Ces signaux de remplacement permettent à certaines opérations du système informatique (100) de s'exécuter directement sous la commande du logiciel d'application sans être interceptées par le système d'exploitation.

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