devices/mouse.c


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

#include "mouse.h"
#include <stdint.h>
#include <stdio.h>
#include <sys/io.h>

// TODO: All output to port 0x60 or 0x64 must be preceded by waiting for bit 1 (value=2) of port 0x64 to become clear.
// TODO: Similarly, bytes cannot be read from port 0x60 until bit 0 (value=1) of port 0x64 is set.

void
mouse_init()
{
  // Sending a command or data byte to the mouse (to port 0x60) must be preceded by sending a 0xD4 byte to port 0x64
  // (with appropriate waits on port 0x64, bit 1, before sending each output byte). Note: this 0xD4 byte does not
  // generate any ACK, from either the keyboard or mouse.

  // enable second ps/2
  // outb(0x64, 0xa8);

  // outb(0x64, 0xd4);
  // outb(0x60, 0xf4);
  // printf("mouse_init: enable streaming(0xf4): %x\n", inb(0x60));

  /*
  outb(0x64, 0xd4);
  while (inb(0x64) & 0x1)
    ;
  outb(0x60, 0xf2);
  printf("mouse_init: mouse_id(0xf2 %x): %x\n", inb(0x60), inb(0x60));
  */
}