2 * Copyright (c) 1997 Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/i386/boot/biosboot/probe_keyboard.c,v 1.15 1999/08/28 00:43:13 peter Exp $
29 #include <sys/types.h>
31 #include <machine/cpufunc.h>
33 #include <i386/isa/isa.h>
35 #include <dev/kbd/atkbdcreg.h>
39 #define PROBE_MAXRETRY 5
40 #define PROBE_MAXWAIT 400
44 /* 7 microsec delay necessary for some keyboard controllers */
49 * I know this is broken, but no timer is avaiable yet at this stage...
50 * See also comments in `delay1ms()' in `io.c'.
52 inb(IO_DUMMY); inb(IO_DUMMY);
53 inb(IO_DUMMY); inb(IO_DUMMY);
54 inb(IO_DUMMY); inb(IO_DUMMY);
58 * Perform a simple test on the keyboard; issue the ECHO command and see
59 * if the right answer is returned. We don't do anything as drastic as
60 * full keyboard reset; it will be too troublesome and take too much time.
65 int retry = PROBE_MAXRETRY;
69 while (--retry >= 0) {
71 while (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL) {
73 inb(IO_KBD + KBD_DATA_PORT);
77 /* wait until the controller can accept a command */
78 for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
79 if (((i = inb(IO_KBD + KBD_STATUS_PORT))
80 & (KBDS_INPUT_BUFFER_FULL | KBDS_ANY_BUFFER_FULL)) == 0)
82 if (i & KBDS_ANY_BUFFER_FULL) {
84 inb(IO_KBD + KBD_DATA_PORT);
91 /* send the ECHO command */
92 outb(IO_KBD + KBD_DATA_PORT, KBDC_ECHO);
94 /* wait for a response */
95 for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
96 if (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL)
104 i = inb(IO_KBD + KBD_DATA_PORT);
105 #ifdef PROBE_KBD_BEBUG
106 printf("probe_keyboard: got 0x%x.\n", i);
109 /* got the right answer */