rev |
line source |
nuclear@0
|
1 /*
|
nuclear@0
|
2 Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
|
nuclear@0
|
3
|
nuclear@0
|
4 This file is part of libgba, a library for GameBoy Advance development.
|
nuclear@0
|
5
|
nuclear@0
|
6 This program is free software; you can redistribute it and/or modify
|
nuclear@0
|
7 it under the terms of the GNU General Public License as published by
|
nuclear@0
|
8 the Free Software Foundation; either version 2 of the License, or
|
nuclear@0
|
9 (at your option) any later version.
|
nuclear@0
|
10
|
nuclear@0
|
11 This program is distributed in the hope that it will be useful,
|
nuclear@0
|
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
|
nuclear@0
|
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
nuclear@0
|
14 GNU General Public License for more details.
|
nuclear@0
|
15
|
nuclear@0
|
16 You should have received a copy of the GNU General Public License
|
nuclear@0
|
17 along with this program; if not, write to the Free Software
|
nuclear@0
|
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
nuclear@0
|
19 */
|
nuclear@0
|
20
|
nuclear@0
|
21 #include "intr.h"
|
nuclear@0
|
22 #include "error.h"
|
nuclear@0
|
23
|
nuclear@0
|
24 #include "gfx.h"
|
nuclear@0
|
25
|
nuclear@0
|
26 unsigned short *reg_int_master = (unsigned short*)0x04000208;
|
nuclear@0
|
27 unsigned short *reg_int_mask = (unsigned short*)0x04000200;
|
nuclear@0
|
28 static volatile unsigned short *reg_int = (unsigned short*)0x04000202;
|
nuclear@0
|
29
|
nuclear@0
|
30 #define MAX_INTR 14
|
nuclear@0
|
31 static void (*intr_table[MAX_INTR])(void);
|
nuclear@0
|
32
|
nuclear@0
|
33 static void unexpected_intr(void) {
|
nuclear@0
|
34 panic("unexpected interrupt");
|
nuclear@0
|
35 }
|
nuclear@0
|
36
|
nuclear@0
|
37 static void intr_handler(void) {
|
nuclear@0
|
38 int i;
|
nuclear@0
|
39 unsigned short irq;
|
nuclear@0
|
40 char buf[20];
|
nuclear@0
|
41
|
nuclear@0
|
42 clr_int();
|
nuclear@0
|
43
|
nuclear@0
|
44 irq = *reg_int & 0x3fff;
|
nuclear@0
|
45
|
nuclear@0
|
46 for(i=0; i<MAX_INTR; i++) {
|
nuclear@0
|
47 unsigned short irq_bit = (1 << i);
|
nuclear@0
|
48 if((irq & irq_bit) && intr_table[i]) {
|
nuclear@0
|
49 intr_table[i]();
|
nuclear@0
|
50 }
|
nuclear@0
|
51 }
|
nuclear@0
|
52
|
nuclear@0
|
53 *reg_int = irq;
|
nuclear@0
|
54
|
nuclear@0
|
55 set_int();
|
nuclear@0
|
56 }
|
nuclear@0
|
57
|
nuclear@0
|
58 void intr_init(void) {
|
nuclear@0
|
59 int i;
|
nuclear@0
|
60 unsigned long *ptr = (unsigned long*)0x3007ffc;
|
nuclear@0
|
61 *ptr = (unsigned long)intr_handler;
|
nuclear@0
|
62
|
nuclear@0
|
63 for(i=0; i<MAX_INTR; i++) {
|
nuclear@0
|
64 interrupt(i, unexpected_intr);
|
nuclear@0
|
65 }
|
nuclear@0
|
66 }
|
nuclear@0
|
67
|
nuclear@0
|
68 void interrupt(int intr, void (*handler)(void)) {
|
nuclear@0
|
69 intr_table[intr] = handler;
|
nuclear@0
|
70 }
|