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