6b15efd961
Use bd_getdev() to work out a dev_t for the root device. Allow $rootdev to override $currdev as the root device. biosdisk.c Save the slice table and disklabel when opening a disk. Add bd_getdev(), which attempts to return a dev_t corresponding to a given device. Cases which it still doesn't get right: - The inevitable da-when-wd-also-exists - Disks with no slice table (the slice number is not set correctly) The first is difficult to get right, the second will be fixed in an upcoming commit. comconsole.c vidconsole.c getchar() should return an 8-bit value; some BIOSsen pack extra information in %eax. libi386.h Remove some stale prototypes, add new ones.
227 lines
5.5 KiB
C
227 lines
5.5 KiB
C
/*
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* Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
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* Copyright (c) 1997 Kazutaka YOKOTA (yokota@zodiac.mech.utsunomiya-u.ac.jp)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From Id: probe_keyboard.c,v 1.13 1997/06/09 05:10:55 bde Exp
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*
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* $Id: vidconsole.c,v 1.2 1998/09/17 23:52:10 msmith Exp $
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*/
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#include <stand.h>
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#include <bootstrap.h>
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#include <btxv86.h>
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#include "libi386.h"
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#if KEYBOARD_PROBE
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#include <machine/cpufunc.h>
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static int probe_keyboard(void);
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#endif
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static void vidc_probe(struct console *cp);
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static int vidc_init(int arg);
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static void vidc_putchar(int c);
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static int vidc_getchar(void);
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static int vidc_ischar(void);
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struct console vidconsole = {
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"vidconsole",
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"internal video/keyboard",
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0,
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vidc_probe,
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vidc_init,
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vidc_putchar,
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vidc_getchar,
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vidc_ischar
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};
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static void
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vidc_probe(struct console *cp)
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{
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/* look for a keyboard */
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#if KEYBOARD_PROBE
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if (probe_keyboard())
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#endif
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{
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cp->c_flags |= C_PRESENTIN;
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}
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/* XXX for now, always assume we can do BIOS screen output */
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cp->c_flags |= C_PRESENTOUT;
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}
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static int
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vidc_init(int arg)
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{
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return(0); /* XXX reinit? */
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}
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static void
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vidc_putchar(int c)
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{
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v86.ctl = 0;
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v86.addr = 0x10;
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v86.eax = 0xe00 | c;
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v86.ebx = 0x7;
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v86int();
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}
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static int
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vidc_getchar(void)
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{
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if (vidc_ischar()) {
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v86.ctl = 0;
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v86.addr = 0x16;
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v86.eax = 0x0;
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v86int();
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return(v86.eax & 0xff);
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} else {
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return(-1);
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}
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}
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static int
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vidc_ischar(void)
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{
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v86.ctl = 0;
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v86.addr = 0x16;
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v86.eax = 0x100;
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v86int();
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return(v86.eax);
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}
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#if KEYBOARD_PROBE
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#define PROBE_MAXRETRY 5
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#define PROBE_MAXWAIT 400
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#define IO_DUMMY 0x84
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#define IO_KBD 0x060 /* 8042 Keyboard */
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/* selected defines from kbdio.h */
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#define KBD_STATUS_PORT 4 /* status port, read */
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#define KBD_DATA_PORT 0 /* data port, read/write
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* also used as keyboard command
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* and mouse command port
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*/
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#define KBDC_ECHO 0x00ee
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#define KBDS_ANY_BUFFER_FULL 0x0001
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#define KBDS_INPUT_BUFFER_FULL 0x0002
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#define KBD_ECHO 0x00ee
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/* 7 microsec delay necessary for some keyboard controllers */
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static void
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delay7(void)
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{
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/*
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* I know this is broken, but no timer is avaiable yet at this stage...
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* See also comments in `delay1ms()'.
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*/
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inb(IO_DUMMY); inb(IO_DUMMY);
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inb(IO_DUMMY); inb(IO_DUMMY);
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inb(IO_DUMMY); inb(IO_DUMMY);
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}
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/*
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* This routine uses an inb to an unused port, the time to execute that
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* inb is approximately 1.25uS. This value is pretty constant across
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* all CPU's and all buses, with the exception of some PCI implentations
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* that do not forward this I/O adress to the ISA bus as they know it
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* is not a valid ISA bus address, those machines execute this inb in
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* 60 nS :-(.
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*
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*/
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static void
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delay1ms(void)
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{
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int i = 800;
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while (--i >= 0)
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(void)inb(0x84);
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}
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/*
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* We use the presence/absence of a keyboard to determine whether the internal
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* console can be used for input.
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*
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* Perform a simple test on the keyboard; issue the ECHO command and see
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* if the right answer is returned. We don't do anything as drastic as
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* full keyboard reset; it will be too troublesome and take too much time.
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*/
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static int
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probe_keyboard(void)
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{
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int retry = PROBE_MAXRETRY;
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int wait;
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int i;
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while (--retry >= 0) {
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/* flush any noise */
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while (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL) {
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delay7();
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inb(IO_KBD + KBD_DATA_PORT);
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delay1ms();
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}
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/* wait until the controller can accept a command */
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for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
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if (((i = inb(IO_KBD + KBD_STATUS_PORT))
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& (KBDS_INPUT_BUFFER_FULL | KBDS_ANY_BUFFER_FULL)) == 0)
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break;
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if (i & KBDS_ANY_BUFFER_FULL) {
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delay7();
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inb(IO_KBD + KBD_DATA_PORT);
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}
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delay1ms();
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}
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if (wait <= 0)
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continue;
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/* send the ECHO command */
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outb(IO_KBD + KBD_DATA_PORT, KBDC_ECHO);
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/* wait for a response */
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for (wait = PROBE_MAXWAIT; wait > 0; --wait) {
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if (inb(IO_KBD + KBD_STATUS_PORT) & KBDS_ANY_BUFFER_FULL)
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break;
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delay1ms();
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}
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if (wait <= 0)
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continue;
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delay7();
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i = inb(IO_KBD + KBD_DATA_PORT);
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#ifdef PROBE_KBD_BEBUG
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printf("probe_keyboard: got 0x%x.\n", i);
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#endif
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if (i == KBD_ECHO) {
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/* got the right answer */
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return (0);
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}
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}
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return (1);
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}
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#endif /* KEYBOARD_PROBE */
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