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Universidad Nacional de Córdoba - Facultad de Ciencias Exactas, Físicas y Naturales

Sistemas de Computación - Trabajo Practico #3

Para compilar los ejemplos:

nasm -f bin <nombre-del-archivo-asm> -o <nombre-del-binario>

Para correrlos en el entorno virtual QEMU:

qemu-system-x86_64 <nombre-del-binario>

Modo Real

El archivo keyboard_input.asm utiliza las interrupciones que brinda la BIOS para tomar caracteres del teclado e imprimirlos en pantalla.

Modo Protegido

El archivo protected_mode.asm en cambio se ejecuta en modo protegido. Para esto comienza deshabilitando las interrupciones y generando una GDT (Global Descriptor Table) con un segmento de datos y uno de código.

Luego aprovecha el video memory register para imprimir en pantalla un mensaje, utilizando para ello los registros de propósito general.

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