/*
 Simula un falso puerto de comunicaciones. Utiliza el PIT para generar una
 interrupción.
 Para que funcione correctamente MaRTE no debe utilizar la PIT, luego debe
 estar configurado para usar un PII.
 */
#ifndef __SIMULATED_COM_PORT_H__
#define __SIMULATED_COM_PORT_H__

// IO registers
#define FAKE_COM_PORT_CONTROL_REG 0x100
#define FAKE_COM_PORT_DATA_REG 0x101

// Interrupt number generated by the communication port when a new data has
// arrived
#define FAKE_COM_PORT_IRQ TIMER_HWINTERRUPT

/*
 * Depending on the value of port:
 *
 * FAKE_COM_PORT_CONTROL_REG: the communication port is initialized
 *
 * Any other value: no effect
 */
extern void fake_com_port_intr_outb(unsigned short port, char val);

/*
 * Depending on the value of port:
 *
 * FAKE_COM_PORT_DATA_REG: Returns the last byte received
 *
 * FAKE_COM_PORT_CONTROL_REG: returns 0x01 when there is new data
 * available and 0x00 in other case
 *
 * Any other value: returns 0x00 
 */
extern char fake_com_port_intr_inb(unsigned short port);

#endif // __SIMULATED_COM_PORT_H__