a1c1935fa8
Also, make sure we set %dx each time around otherwise the commands suddenly start trying to work on things like com92 instead of com1. Make sure comc_init() is only run once. Cosmetic change to init-time character eater.
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 1998 Michael Smith (msmith@freebsd.org)
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* From Id: probe_keyboard.c,v 1.13 1997/06/09 05:10:55 bde Exp
|
|
*
|
|
* $Id: comconsole.c,v 1.3 1998/10/02 16:32:45 msmith Exp $
|
|
*/
|
|
|
|
#include <stand.h>
|
|
#include <bootstrap.h>
|
|
#include <btxv86.h>
|
|
#include "libi386.h"
|
|
|
|
static void comc_probe(struct console *cp);
|
|
static int comc_init(int arg);
|
|
static void comc_putchar(int c);
|
|
static int comc_getchar(void);
|
|
static int comc_ischar(void);
|
|
|
|
static int comc_started;
|
|
|
|
struct console comconsole = {
|
|
"comconsole",
|
|
"BIOS serial port",
|
|
0,
|
|
comc_probe,
|
|
comc_init,
|
|
comc_putchar,
|
|
comc_getchar,
|
|
comc_ischar
|
|
};
|
|
|
|
#define BIOS_COMPORT 0
|
|
|
|
static void
|
|
comc_probe(struct console *cp)
|
|
{
|
|
/* XXX check the BIOS equipment list? */
|
|
cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
|
|
}
|
|
|
|
static int
|
|
comc_init(int arg)
|
|
{
|
|
int i;
|
|
|
|
if (comc_started && arg == 0)
|
|
return 0;
|
|
comc_started = 1;
|
|
v86.ctl = 0;
|
|
v86.addr = 0x14;
|
|
v86.eax = 0xe3; /* 9600N81 */
|
|
v86.edx = BIOS_COMPORT; /* XXX take as arg, or use env var? */
|
|
v86int();
|
|
|
|
for(i = 0; i < 10 && comc_ischar(); i++)
|
|
(void)comc_getchar();
|
|
|
|
return(0);
|
|
}
|
|
|
|
static void
|
|
comc_putchar(int c)
|
|
{
|
|
v86.ctl = 0;
|
|
v86.addr = 0x14;
|
|
v86.eax = 0x100 | c; /* Function 1 = write */
|
|
v86.edx = BIOS_COMPORT; /* XXX take as arg, or use env var? */
|
|
v86int();
|
|
}
|
|
|
|
static int
|
|
comc_getchar(void)
|
|
{
|
|
if (comc_ischar()) {
|
|
v86.ctl = 0;
|
|
v86.addr = 0x14;
|
|
v86.eax = 0x200; /* Function 2 = read */
|
|
v86.edx = BIOS_COMPORT; /* XXX take as arg, or use env var? */
|
|
v86int();
|
|
return(v86.eax & 0xff);
|
|
} else {
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
static int
|
|
comc_ischar(void)
|
|
{
|
|
v86.ctl = 0;
|
|
v86.addr = 0x14;
|
|
v86.eax = 0x300; /* Function 3 = status */
|
|
v86.edx = BIOS_COMPORT; /* XXX take as arg, or use env var? */
|
|
v86int();
|
|
return(v86.eax & 0x100); /* AH bit 1 is "receive data ready" */
|
|
}
|