1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/*
* https://wiki.osdev.org/%228042%22_PS/2_Controller
*/
#include "keyboard.h"
#include "ps2_controller.h"
#include <stdint.h>
#include <stdio.h>
#include <sys/io.h>
// r status register
// w command register
#define comm_port 0x64
#define comm_enable_first_ps2 0xae
#define comm_read_ctrl_config 0x20
#define comm_write_ctrl_config 0x60
#define data_port 0x60
#define data_enable_scanning 0xf4
void
ps2_ctrl_init()
{
// eat all previous keystrikes
while (inb(comm_port) & 0x1) inb(data_port);
uint8_t test;
outb(0xaa, comm_port);
test = inb(data_port);
printf("i8042: self test 0xaa:%x %s\n", test, test == 0x55 ? "ok" : "failed");
outb(0xab, comm_port);
test = inb(data_port);
printf("i8042: port1 test 0xab:%x %s\n", test, test == 0x00 ? "ok" : "failed");
outb(0xa9, comm_port);
test = inb(data_port);
printf("i8042: port2 test 0xa9:%x %s\n", test, test == 0x00 ? "ok" : "failed");
// printf("8042: init keyboard\n");
outb(comm_enable_first_ps2, comm_port);
outb(comm_read_ctrl_config, comm_port);
const uint8_t conf = (inb(data_port) | 1) & ~0x10;
outb(comm_write_ctrl_config, comm_port);
outb(conf, data_port);
outb(data_enable_scanning, data_port);
}
unsigned char
kbd_read_next()
{
return inb(data_port);
}
|
