jcs.org
fork of PCE focusing on macplus, supporting DaynaPort SCSI network emulation
1/*****************************************************************************
2 * pce *
3 *****************************************************************************/
4
5/*****************************************************************************
6 * File name: src/arch/dos/int.c *
7 * Created: 2013-01-03 by Hampa Hug <hampa@hampa.ch> *
8 * Copyright: (C) 2013-2015 Hampa Hug <hampa@hampa.ch> *
9 *****************************************************************************/
10
11/*****************************************************************************
12 * This program is free software. You can redistribute it and / or modify it *
13 * under the terms of the GNU General Public License version 2 as published *
14 * by the Free Software Foundation. *
15 * *
16 * This program is distributed in the hope that it will be useful, but *
17 * WITHOUT ANY WARRANTY, without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General *
19 * Public License for more details. *
20 *****************************************************************************/
21
22
23#include "main.h"
24#include "dos.h"
25#include "int.h"
26#include "int10.h"
27#include "int21.h"
28
29#include <cpu/e8086/e8086.h>
30
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34
35
36/*
37 * Int 11
38 */
39static
40int sim_int11 (dos_t *sim)
41{
42 e86_set_ax (&sim->cpu, 0x0061);
43
44 return (0);
45}
46
47/*
48 * Int 12
49 */
50static
51int sim_int12 (dos_t *sim)
52{
53 e86_set_ax (&sim->cpu, sim_get_uint16 (sim, 0x40, 0x13));
54
55 return (0);
56}
57
58
59/*
60 * Int 16
61 */
62static
63int sim_int16 (dos_t *sim)
64{
65 switch (e86_get_ah (&sim->cpu)) {
66 case 0x01:
67 case 0x11:
68 e86_set_zf (&sim->cpu, 1);
69 e86_set_ax (&sim->cpu, 0);
70 break;
71
72 case 0x02:
73 case 0x12:
74 e86_set_al (&sim->cpu, 0);
75 break;
76
77 case 5:
78 break;
79
80 default:
81 return (1);
82 }
83
84 return (0);
85}
86
87
88/*
89 * 1A / 00: Get time
90 */
91static
92int int1a_fct_00 (dos_t *sim)
93{
94 e86_set_cx (&sim->cpu, 0);
95 e86_set_dx (&sim->cpu, 0);
96
97 return (0);
98}
99
100/*
101 * Int 1A
102 */
103static
104int sim_int1a (dos_t *sim)
105{
106 switch (e86_get_ah (&sim->cpu)) {
107 case 0x00:
108 return (int1a_fct_00 (sim));
109 }
110
111 return (1);
112}
113
114
115void sim_int (dos_t *sim, unsigned char val)
116{
117 int ret;
118
119 if (sim->log_int) {
120 fprintf (stderr, "%02X: ", val);
121 sim_print_state_cpu (sim, stderr);
122 }
123
124 ret = 0;
125
126 if ((val < 0x10) || (val > 0x28)) {
127 ret = 0;
128 }
129 else if (val == 0x10) {
130 ret = sim_int10 (sim);
131 }
132 else if (val == 0x11) {
133 ret = sim_int11 (sim);
134 }
135 else if (val == 0x12) {
136 ret = sim_int12 (sim);
137 }
138 else if (val == 0x16) {
139 ret = sim_int16 (sim);
140 }
141 else if (val == 0x1a) {
142 ret = sim_int1a (sim);
143 }
144 else if (val == 0x21) {
145 ret = sim_int21 (sim);
146 }
147 else if (val == 0x28) {
148 ;
149 }
150 else {
151 ret = 1;
152 }
153
154 if (sim->log_int) {
155 fprintf (stderr, "%02X: ", val);
156 sim_print_state_cpu (sim, stderr);
157 fputc ('\n', stderr);
158 fflush (stderr);
159 }
160
161 if (ret) {
162 sim_print_state_cpu (sim, stderr);
163 fprintf (stderr, "unknown int: %02X / %04X\n", val, e86_get_ax (&sim->cpu));
164 exit (1);
165 }
166}