/* File: PIC.h
   Purpose: inline functions for interrupt service routines
   Autor: M. Czamai, PEAK-System Technik GmbH, Darmstadt, Germany
   Date: 11/2000
*/
#ifndef __PIC_H__
#define __PIC_H__

#define MASTER_PIC		0x20	// base adress master PIC
#define SLAVE_PIC		0xA0	// base adress slave PIC
#define IRQ_MASK		0x01	// offset to mask port
#define EOI				0x20	// end of interrupt

inline void SendEOI(BYTE bIRQ)
{   if (bIRQ > 7) outportb(SLAVE_PIC, EOI);
    outportb(MASTER_PIC, EOI);
}

inline void DisableIrq(BYTE bIRQ)
{ 	WORD wPort;            	// PIC base adress
	wPort = (bIRQ <= 7) ? MASTER_PIC : SLAVE_PIC;
	wPort += IRQ_MASK; 		// use mask port
	bIRQ = bIRQ & 0x07;   	// get PIC number
	outportb(wPort, inportb(wPort) | ( 1 << bIRQ));	// set bit = lock IRQ
}

inline void EnableIrq(BYTE bIRQ)
{	WORD wPort;
  	wPort = (bIRQ <= 7) ? MASTER_PIC : SLAVE_PIC;
  	wPort += IRQ_MASK;
  	bIRQ = bIRQ & 0x07;
  	outportb(wPort, inportb(wPort) & ~( 1 << bIRQ));	// reset bit = allow IRQ
}

#endif	// __PIC_H__