mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
64ee4b5b08
sys/boot/i386/btx/btx/Makefile 1.9 sys/boot/i386/btx/btx/btx.s 1.23 sys/boot/i386/libi386/biosdisk.c 1.32 and 1.33 sys/boot/i386/libi386/biosmem.c 1.5 sys/boot/i386/libi386/comconsole.c 1.8 sys/boot/i386/libi386/gatea20.c 1.3 sys/boot/i386/libi386/time.c 1.4 sys/boot/i386/libi386/vidconsole.c 1.13 sys/boot/i386/loader/Makefile 1.48 sys/boot/i386/loader/main.c 1.22
137 lines
3.7 KiB
C
137 lines
3.7 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <stand.h>
|
|
#include <bootstrap.h>
|
|
#include <machine/cpufunc.h>
|
|
#include "libi386.h"
|
|
|
|
/* selected defines from ns16550.h */
|
|
#define com_data 0 /* data register (R/W) */
|
|
#define com_dlbl 0 /* divisor latch low (W) */
|
|
#define com_dlbh 1 /* divisor latch high (W) */
|
|
#define com_ier 1 /* interrupt enable (W) */
|
|
#define com_iir 2 /* interrupt identification (R) */
|
|
#define com_fifo 2 /* FIFO control (W) */
|
|
#define com_lctl 3 /* line control register (R/W) */
|
|
#define com_cfcr 3 /* line control register (R/W) */
|
|
#define com_mcr 4 /* modem control register (R/W) */
|
|
#define com_lsr 5 /* line status register (R/W) */
|
|
#define com_msr 6 /* modem status register (R/W) */
|
|
|
|
/* selected defines from sioreg.h */
|
|
#define CFCR_DLAB 0x80
|
|
#define MCR_RTS 0x02
|
|
#define MCR_DTR 0x01
|
|
#define LSR_TXRDY 0x20
|
|
#define LSR_RXRDY 0x01
|
|
|
|
#define COMC_FMT 0x3 /* 8N1 */
|
|
#define COMC_TXWAIT 0x40000 /* transmit timeout */
|
|
#define COMC_BPS(x) (115200 / (x)) /* speed to DLAB divisor */
|
|
|
|
#ifndef COMPORT
|
|
#ifdef PC98
|
|
#define COMPORT 0x238
|
|
#else
|
|
#define COMPORT 0x3f8
|
|
#endif
|
|
#endif
|
|
#ifndef COMSPEED
|
|
#define COMSPEED 9600
|
|
#endif
|
|
|
|
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",
|
|
"serial port",
|
|
0,
|
|
comc_probe,
|
|
comc_init,
|
|
comc_putchar,
|
|
comc_getchar,
|
|
comc_ischar
|
|
};
|
|
|
|
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)
|
|
{
|
|
if (comc_started && arg == 0)
|
|
return 0;
|
|
comc_started = 1;
|
|
|
|
outb(COMPORT + com_cfcr, CFCR_DLAB | COMC_FMT);
|
|
outb(COMPORT + com_dlbl, COMC_BPS(COMSPEED) & 0xff);
|
|
outb(COMPORT + com_dlbh, COMC_BPS(COMSPEED) >> 8);
|
|
outb(COMPORT + com_cfcr, COMC_FMT);
|
|
outb(COMPORT + com_mcr, MCR_RTS | MCR_DTR);
|
|
|
|
do
|
|
inb(COMPORT + com_data);
|
|
while (inb(COMPORT + com_lsr) & LSR_RXRDY);
|
|
|
|
return(0);
|
|
}
|
|
|
|
static void
|
|
comc_putchar(int c)
|
|
{
|
|
int wait;
|
|
|
|
for (wait = COMC_TXWAIT; wait > 0; wait--)
|
|
if (inb(COMPORT + com_lsr) & LSR_TXRDY) {
|
|
outb(COMPORT + com_data, (u_char)c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
comc_getchar(void)
|
|
{
|
|
return(comc_ischar() ? inb(COMPORT + com_data) : -1);
|
|
}
|
|
|
|
static int
|
|
comc_ischar(void)
|
|
{
|
|
return(inb(COMPORT + com_lsr) & LSR_RXRDY);
|
|
}
|