generalizing the 16bit interrupt hack to an arbitray int86() call
[bootcensus] / src / kmain.c
1 /*
2 pcboot - bootable PC demo/game kernel
3 Copyright (C) 2018  John Tsiombikas <nuclear@member.fsf.org>
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY, without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program.  If not, see <https://www.gnu.org/licenses/>.
17 */
18 #include <stdio.h>
19 #include <string.h>
20 #include <ctype.h>
21 #include "segm.h"
22 #include "intr.h"
23 #include "keyb.h"
24 #include "timer.h"
25 #include "contty.h"
26 #include "int86.h"
27
28 static void set_mode13h(void)
29 {
30         struct int86regs regs;
31
32         memset(&regs, 0, sizeof regs);
33         regs.eax = 0x13;
34         int86(0x10, &regs);
35 }
36
37 void logohack(void);
38
39 void pcboot_main(void)
40 {
41         init_segm();
42         init_intr();
43         kb_init();
44         con_init();
45
46         /* initialize the timer */
47         init_timer();
48
49         enable_intr();
50
51         printf("PCBoot kernel initialized\n");
52
53         for(;;) {
54                 int c;
55
56                 halt_cpu();
57                 while((c = kb_getkey()) >= 0) {
58                         if(c >= KB_F1 && c <= KB_F12) {
59                                 set_mode13h();
60                                 logohack();
61                         }
62                         if(isprint(c)) {
63                                 printf("key: %d '%c'       \n", c, (char)c);
64                         } else {
65                                 printf("key: %d            \n", c);
66                         }
67                 }
68                 if((nticks % 250) == 0) {
69                         printf("ticks: %ld\r", nticks);
70                 }
71         }
72 }