948486abe3
- Discard large amounts of BIOS-related code in favour of the more compact BTX vm86 interface. - Build the loader module as ELF, although the resulting object is a.out, make gensetdefs 32/64-bit sensitive and use a single copy of it. - Throw away installboot, as it's no longer required. - Use direct bcopy operations in the i386_copy module, as BTX maps the first 16M of memory. Check operations against the detected size of actual memory.
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 1.1.1.1 1998/08/21 03:17:41 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);
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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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