8259.h

一个极小型的操作系统

/*
GazOS Operating System
Copyright (C) 1999  Gareth Owen <[e-mail]>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#ifndef __8259_H
#define __8259_H

void Init8259();
void enable_irq(unsigned short irq_num);
void disable_irq(unsigned short irq_num);

#define M_PIC  0x20     /* I/O for master PIC              */
#define M_IMR  0x21     /* I/O for master IMR              */
#define S_PIC  0xA0     /* I/O for slave PIC               */
#define S_IMR  0xA1     /* I/O for slace IMR               */

#define EOI    0x20     /* EOI command                     */

#define ICW1   0x11     /* Cascade, Edge triggered         */
                        /* ICW2 is vector                  */
                        /* ICW3 is slave bitmap or number  */
#define ICW4   0x01     /* 8088 mode                       */

#define M_VEC  0x68     /* Vector for master               */
#define S_VEC  0x70     /* Vector for slave                */

#define OCW3_IRR  0x0A  /* Read IRR                        */
#define OCW3_ISR  0x0B  /* Read ISR                        */

#endif