nuclear@0: /*
nuclear@0: Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
nuclear@0: 
nuclear@0: This file is part of libgba, a library for GameBoy Advance development.
nuclear@0: 
nuclear@0: This program is free software; you can redistribute it and/or modify
nuclear@0: it under the terms of the GNU General Public License as published by
nuclear@0: the Free Software Foundation; either version 2 of the License, or
nuclear@0: (at your option) any later version.
nuclear@0: 
nuclear@0: This program is distributed in the hope that it will be useful,
nuclear@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@0: GNU General Public License for more details.
nuclear@0: 
nuclear@0: You should have received a copy of the GNU General Public License
nuclear@0: along with this program; if not, write to the Free Software
nuclear@0: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
nuclear@0: */
nuclear@0: 
nuclear@0: #include "intr.h"
nuclear@0: #include "error.h"
nuclear@0: 
nuclear@0: #include "gfx.h"
nuclear@0: 
nuclear@0: unsigned short *reg_int_master = (unsigned short*)0x04000208;
nuclear@0: unsigned short *reg_int_mask = (unsigned short*)0x04000200;
nuclear@0: static volatile unsigned short *reg_int = (unsigned short*)0x04000202;
nuclear@0: 
nuclear@0: #define MAX_INTR	14
nuclear@0: static void (*intr_table[MAX_INTR])(void);
nuclear@0: 
nuclear@0: static void unexpected_intr(void) {
nuclear@0: 	panic("unexpected interrupt");
nuclear@0: }
nuclear@0: 
nuclear@0: static void intr_handler(void) {
nuclear@0: 	int i;
nuclear@0: 	unsigned short irq;
nuclear@0: 	char buf[20];
nuclear@0: 	
nuclear@0: 	clr_int();
nuclear@0: 
nuclear@0: 	irq = *reg_int & 0x3fff;
nuclear@0: 
nuclear@0: 	for(i=0; i<MAX_INTR; i++) {
nuclear@0: 		unsigned short irq_bit = (1 << i);
nuclear@0: 		if((irq & irq_bit) && intr_table[i]) {
nuclear@0: 			intr_table[i]();
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	*reg_int = irq;
nuclear@0: 
nuclear@0: 	set_int();
nuclear@0: }
nuclear@0: 
nuclear@0: void intr_init(void) {
nuclear@0: 	int i;
nuclear@0: 	unsigned long *ptr = (unsigned long*)0x3007ffc;
nuclear@0: 	*ptr = (unsigned long)intr_handler;
nuclear@0: 
nuclear@0: 	for(i=0; i<MAX_INTR; i++) {
nuclear@0: 		interrupt(i, unexpected_intr);
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void interrupt(int intr, void (*handler)(void)) {
nuclear@0: 	intr_table[intr] = handler;
nuclear@0: }