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freebsd-skq/usr.bin/doscmd/int14.c
Thomas Gellekum 1a63d7e08e - First shot at PIC emulation; 
- better 8250 emulation;
- fake vertical retrace bit in Input Status #1 register
  (this was lost in the VGA emu rewrite).

Submitted by:	Igor Serikov <bt@turtle.pangeatech.com>
2001-10-02 11:28:59 +00:00

689 lines
17 KiB
C
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/*
* Copyright (c) 1992, 1993, 1996
* Berkeley Software Design, Inc. All rights reserved.
*
* This code is derived from software contributed to Berkeley Software
* Design, Inc. by Mark Linoman.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Berkeley Software
* Design, Inc.
*
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.
*
* BSDI int14.c,v 2.2 1996/04/08 19:32:45 bostic Exp
*
* $FreeBSD$
*/
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <termios.h>
#include <unistd.h>
#include "doscmd.h"
#include "AsyncIO.h"
#include "com.h"
#define N_BYTES 1024
struct com_data_struct {
int fd; /* BSD/386 file descriptor */
char *path; /* BSD/386 pathname */
int addr; /* ISA I/O address */
unsigned char irq; /* ISA IRQ */
unsigned char inbuf[N_BYTES]; /* input buffer */
unsigned char outbuf[N_BYTES];/* output buffer */
int ids; /* input data size */
int ods; /* output data size */
int emptyint;
struct termios tty;
unsigned char div_latch[2]; /* mirror of 16550 R0':R1'
read/write */
unsigned char int_enable; /* mirror of 16550 R1 read/write */
unsigned char fifo_ctrl; /* mirror of 16550 R2 write only */
unsigned char line_ctrl; /* mirror of 16550 R3 read/write */
unsigned char modem_ctrl; /* mirror of 16550 R4 read/write */
unsigned char modem_stat; /* mirror of 16550 R6 read/write */
unsigned char uart_spare; /* mirror of 16550 R7 read/write */
};
#define DIV_LATCH_LOW 0
#define DIV_LATCH_HIGH 1
struct com_data_struct com_data[N_COMS_MAX];
static unsigned char com_port_in(int port);
static void com_port_out(int port, unsigned char val);
static void com_set_line(struct com_data_struct *cdsp,
unsigned char port, unsigned char param);
static void
manage_int(struct com_data_struct *cdsp)
{
if ((cdsp->int_enable & IE_RCV_DATA) && cdsp->ids > 0) {
hardint(cdsp->irq);
debug(D_PORT, "manage_int: hardint rd\n");
return;
}
if ((cdsp->int_enable & IE_TRANS_HLD) && cdsp->emptyint) {
hardint(cdsp->irq);
debug(D_PORT, "manage_int: hardint wr\n");
return;
}
unpend (cdsp->irq);
}
static int
has_enough_data(struct com_data_struct *cdsp)
{
switch (cdsp->fifo_ctrl & (FC_FIFO_EN | FC_FIFO_SZ_MASK)) {
case FC_FIFO_EN | FC_FIFO_4B:
return cdsp->ids >= 4;
case FC_FIFO_EN | FC_FIFO_8B:
return cdsp->ids >= 8;
case FC_FIFO_EN | FC_FIFO_14B:
return cdsp->ids >= 14;
}
return cdsp->ids;
}
static void
input(struct com_data_struct *cdsp, int force_read)
{
int nbytes;
if (cdsp->ids < N_BYTES && (force_read || !has_enough_data(cdsp))) {
nbytes = read(cdsp->fd, &cdsp->inbuf[cdsp->ids],
N_BYTES - cdsp->ids);
debug(D_PORT, "read of fd %d on '%s' returned %d (%s)\n",
cdsp->fd, cdsp->path, nbytes,
nbytes == -1 ? strerror(errno) : "");
if (nbytes != -1)
cdsp->ids += nbytes;
}
}
static void
output(struct com_data_struct *cdsp)
{
int nbytes;
if (cdsp->ods > 0) {
nbytes = write(cdsp->fd, &cdsp->outbuf[0], cdsp->ods);
debug(D_PORT, "write of fd %d on '%s' returned %d (%s)\n",
cdsp->fd, cdsp->path, nbytes,
nbytes == -1 ? strerror(errno) : "");
if (nbytes != -1) {
cdsp->ods -= nbytes;
memmove (&cdsp->outbuf[0],
&cdsp->outbuf[nbytes], cdsp->ods);
if ((cdsp->int_enable & IE_TRANS_HLD)
&& cdsp->ods == 0)
cdsp->emptyint = 1;
}
}
}
static void
flush_out(void* arg)
{
struct com_data_struct *cdsp = (struct com_data_struct*)arg;
output(cdsp);
manage_int(cdsp);
}
/*
* We postponed flush till the end of interrupt processing
* (see int.c).
*/
static int
write_char(struct com_data_struct *cdsp, char c)
{
int r = 0;
cdsp->emptyint = 0;
if (cdsp->ods >= N_BYTES)
output(cdsp);
if (cdsp->ods < N_BYTES) {
cdsp->outbuf[cdsp->ods ++] = c;
if (!isinhardint(cdsp->irq))
output(cdsp);
r = 1;
}
manage_int(cdsp);
return r;
}
static int
read_char(struct com_data_struct *cdsp)
{
int c = -1;
input(cdsp, 0);
if (cdsp->ids > 0) {
c = cdsp->inbuf[0];
cdsp->ids --;
memmove(&cdsp->inbuf[0], &cdsp->inbuf[1], cdsp->ids);
}
manage_int(cdsp);
debug(D_PORT, "read_char: %x\n", c);
return c;
}
static void
new_ii(struct com_data_struct *cdsp)
{
if ((cdsp->int_enable & IE_TRANS_HLD) && cdsp->ods == 0)
cdsp->emptyint = 1;
manage_int(cdsp);
}
static unsigned char
get_status(struct com_data_struct *cdsp)
{
unsigned char s = (LS_X_DATA_E | LS_X_HOLD_E);
if (cdsp->ids > 0)
s |= LS_RCV_DATA_RD;
if (cdsp->ods > 0) {
s &= ~LS_X_DATA_E;
if (cdsp->ods >= N_BYTES)
s &= ~LS_X_HOLD_E;
}
debug(D_PORT, "get_status: %x\n", (unsigned)s);
return s;
}
static unsigned char
get_int_id(struct com_data_struct *cdsp)
{
unsigned char s = II_PEND_INT;
if (cdsp->fifo_ctrl & FC_FIFO_EN)
s |= II_FIFOS_EN;
if ((cdsp->int_enable & IE_RCV_DATA) && cdsp->ids > 0) {
if (has_enough_data(cdsp))
s = (s & ~II_PEND_INT) | II_RCV_DATA;
else
s = (s & ~II_PEND_INT) | II_TO;
} else
if ((cdsp->int_enable & IE_TRANS_HLD) && cdsp->emptyint) {
cdsp->emptyint = 0;
s = (s & ~II_PEND_INT) | II_TRANS_HLD;
}
debug(D_PORT, "get_int_id: %x\n", (unsigned)s);
return s;
}
static void
com_async(int fd, int cond, void *arg, regcontext_t *REGS)
{
struct com_data_struct *cdsp = (struct com_data_struct*) arg;
debug(D_PORT, "com_async: %X.\n", cond);
if (cond & AS_RD)
input(cdsp, 1);
if (cond & AS_WR)
output(cdsp);
manage_int(cdsp);
}
void
int14(regcontext_t *REGS)
{
struct com_data_struct *cdsp;
int i;
debug(D_PORT, "int14: dl = 0x%02X, al = 0x%02X.\n", R_DL, R_AL);
if (R_DL >= N_COMS_MAX) {
if (vflag)
dump_regs(REGS);
fatal ("int14: illegal com port COM%d", R_DL + 1);
}
cdsp = &(com_data[R_DL]);
switch (R_AH) {
case 0x00: /* Initialize Serial Port */
com_set_line(cdsp, R_DL + 1, R_AL);
R_AH = get_status(cdsp);
R_AL = 0;
break;
case 0x01: /* Write Character */
if (write_char(cdsp, R_AL)) {
R_AH = get_status(cdsp);
R_AL = 0;
} else {
debug(D_PORT, "int14: lost output character 0x%02x\n", R_AL);
R_AH = LS_SW_TIME_OUT;
R_AL = 0;
}
break;
case 0x02: /* Read Character */
i = read_char(cdsp);
if (i != -1) {
R_AH = get_status(cdsp);
R_AL = (char)i;
} else {
R_AH = LS_SW_TIME_OUT;
R_AL = 0x60;
}
break;
case 0x03: /* Status Request */
R_AH = get_status(cdsp);
R_AL = 0;
break;
case 0x04: /* Extended Initialization */
R_AX = (LS_SW_TIME_OUT) << 8;
break;
case 0x05: /* Modem Control Register operations */
switch (R_AH) {
case 0x00: /* Read Modem Control Register */
R_AX = (LS_SW_TIME_OUT) << 8;
break;
case 0x01: /* Write Modem Control Register */
R_AX = (LS_SW_TIME_OUT) << 8;
break;
default:
unknown_int3(0x14, 0x05, R_AL, REGS);
break;
}
break;
default:
unknown_int2(0x14, R_AH, REGS);
break;
}
}
/* called when doscmd initializes a single line */
static void
com_set_line(struct com_data_struct *cdsp, unsigned char port, unsigned char param)
{
struct stat stat_buf;
int mode = 0; /* read | write */
int reg_num, ret_val, spd, speed;
u_int8_t div_hi, div_lo;
debug(D_PORT, "com_set_line: cdsp = %8p, port = 0x%04x,"
"param = 0x%04X.\n", cdsp, port, param);
if (cdsp->fd > 0) {
debug(D_PORT, "Re-initialize serial port com%d\n", port);
_RegisterIO(cdsp->fd, 0, 0, 0);
(void)close(cdsp->fd);
} else {
debug(D_PORT, "Initialize serial port com%d\n", port);
}
stat(cdsp->path, &stat_buf);
if (!S_ISCHR(stat_buf.st_mode) ||
((cdsp->fd = open(cdsp->path, O_RDWR | O_NONBLOCK, 0666)) == -1)) {
debug(D_PORT,
"Could not initialize serial port com%d on path '%s'\n",
port, cdsp->path);
return;
}
cdsp->ids = cdsp->ods = cdsp->emptyint = 0;
cdsp->int_enable = 0;
cdsp->fifo_ctrl = 0;
cdsp->modem_ctrl = 0;
cdsp->modem_stat = 0;
cdsp->uart_spare = 0;
if ((param & PARITY_EVEN) == PARITY_NONE)
cdsp->tty.c_iflag = IGNBRK | IGNPAR /* | IXON | IXOFF | IXANY */;
else
cdsp->tty.c_iflag = IGNBRK /* | IXON | IXOFF | IXANY */;
cdsp->tty.c_oflag = 0;
cdsp->tty.c_lflag = 0;
cdsp->tty.c_cc[VTIME] = 0;
cdsp->tty.c_cc[VMIN] = 0;
cdsp->tty.c_cflag = CREAD | CLOCAL | HUPCL;
/* MCL WHY CLOCAL ??????; but, gets errno EIO on writes, else */
if ((param & TXLEN_8BITS) == TXLEN_8BITS) {
cdsp->tty.c_cflag |= CS8;
cdsp->line_ctrl |= 3;
} else {
cdsp->tty.c_cflag |= CS7;
cdsp->line_ctrl |= 2;
}
if ((param & STOPBIT_2) == STOPBIT_2) {
cdsp->tty.c_cflag |= CSTOPB;
cdsp->line_ctrl |= LC_STOP_B;
} else {
cdsp->tty.c_cflag &= ~CSTOPB;
cdsp->line_ctrl &= ~LC_STOP_B;
}
switch (param & PARITY_EVEN) {
case PARITY_ODD:
cdsp->tty.c_cflag |= (PARENB | PARODD);
cdsp->line_ctrl &= ~LC_EVEN_P;
cdsp->line_ctrl |= LC_PAR_E;
break;
case PARITY_EVEN:
cdsp->tty.c_cflag |= PARENB;
cdsp->line_ctrl |= LC_EVEN_P | LC_PAR_E;
break;
case PARITY_NONE:
cdsp->line_ctrl &= ~LC_PAR_E;
default:
break;
}
switch (param & BITRATE_9600) {
case BITRATE_110:
speed = B110;
spd = 110;
break;
case BITRATE_150:
speed = B150;
spd = 150;
break;
case BITRATE_300:
speed = B300;
spd = 300;
break;
case BITRATE_600:
speed = B600;
spd = 600;
break;
case BITRATE_1200:
speed = B1200;
spd = 1200;
break;
case BITRATE_2400:
speed = B2400;
spd = 2400;
break;
case BITRATE_4800:
speed = B4800;
spd = 4800;
break;
case BITRATE_9600:
speed = B9600;
spd = 9600;
break;
}
debug(D_PORT,
"com_set_line: going with cflag 0x%X iflag 0x%X speed %d.\n",
cdsp->tty.c_cflag, cdsp->tty.c_iflag, speed);
div_lo = (115200 / spd) & 0x00ff;
div_hi = (115200 / spd) & 0xff00;
cdsp->div_latch[DIV_LATCH_LOW] = div_lo;
cdsp->div_latch[DIV_LATCH_HIGH] = div_hi;
errno = 0;
ret_val = cfsetispeed(&cdsp->tty, speed);
debug(D_PORT, "com_set_line: cfsetispeed returned 0x%X.\n", ret_val);
errno = 0;
ret_val = cfsetospeed(&cdsp->tty, speed);
debug(D_PORT, "com_set_line: cfsetospeed returned 0x%X.\n", ret_val);
errno = 0;
ret_val = tcsetattr(cdsp->fd, 0, &cdsp->tty);
debug(D_PORT, "com_set_line: tcsetattr returned 0x%X (%s).\n",
ret_val, ret_val == -1 ? strerror(errno) : "");
errno = 0;
ret_val = fcntl(cdsp->fd, F_SETFL, O_NDELAY);
debug(D_PORT, "fcntl of 0x%X, 0x%X to fd %d returned %d errno %d\n",
F_SETFL, O_NDELAY, cdsp->fd, ret_val, errno);
errno = 0;
ret_val = ioctl(cdsp->fd, TIOCFLUSH, &mode);
debug(D_PORT, "ioctl of 0x%02lx to fd %d on 0x%X returned %d errno %d\n",
TIOCFLUSH, cdsp->fd, mode, ret_val, errno);
for (reg_num = 0; reg_num < N_OF_COM_REGS; reg_num++) {
define_input_port_handler(cdsp->addr + reg_num, com_port_in);
define_output_port_handler(cdsp->addr + reg_num, com_port_out);
}
debug(D_PORT, "com%d: attached '%s' at addr 0x%04x irq %d\n",
port, cdsp->path, cdsp->addr, cdsp->irq);
set_eoir(cdsp->irq, flush_out, cdsp);
_RegisterIO(cdsp->fd, com_async, cdsp, 0);
}
static void
try_set_speed(struct com_data_struct *cdsp)
{
unsigned divisor, speed;
int ret_val;
divisor = (unsigned) cdsp->div_latch[DIV_LATCH_HIGH] << 8
| (unsigned) cdsp->div_latch[DIV_LATCH_LOW];
debug(D_PORT, "try_set_speed: divisor = %u\n", divisor);
if (divisor == 0)
return;
speed = 115200 / divisor;
if (speed == 0)
return;
errno = 0;
ret_val = cfsetispeed(&cdsp->tty, speed);
debug(D_PORT, "try_set_speed: cfsetispeed returned 0x%X.\n", ret_val);
errno = 0;
ret_val = cfsetospeed(&cdsp->tty, speed);
debug(D_PORT, "try_set_speed: cfsetospeed returned 0x%X.\n", ret_val);
errno = 0;
ret_val = tcsetattr(cdsp->fd, 0, &cdsp->tty);
debug(D_PORT, "try_set_speed: tcsetattr returned 0x%X (%s).\n", ret_val,
ret_val == -1 ? strerror (errno) : "");
}
/* called when config.c initializes a single line */
void
init_com(int port, char *path, int addr, unsigned char irq)
{
struct com_data_struct *cdsp;
debug(D_PORT, "init_com: port = 0x%04x, addr = 0x%04X, irq = %d.\n",
port, addr, irq);
cdsp = &(com_data[port]);
cdsp->path = path; /* XXX DEBUG strcpy? */
cdsp->addr = addr;
cdsp->irq = irq;
cdsp->fd = -1;
com_set_line(cdsp, port + 1, TXLEN_8BITS | BITRATE_9600);
/* update BIOS variables */
nserial++;
*(u_int16_t *)&BIOSDATA[0x00 + 2 * port] = (u_int16_t)addr;
}
/* called when DOS wants to read directly from a physical port */
unsigned char
com_port_in(int port)
{
struct com_data_struct *cdsp;
unsigned char rs;
unsigned char i;
int r;
/* search for a valid COM ???or MOUSE??? port */
for (i = 0; i < N_COMS_MAX; i++) {
if (com_data[i].addr == ((unsigned short)port & 0xfff8)) {
cdsp = &(com_data[i]);
break;
}
}
if (i == N_COMS_MAX) {
debug(D_PORT, "com port 0x%04x not found\n", port);
return 0xff;
}
switch (port - cdsp->addr) {
/* 0x03F8 - (receive buffer) or (divisor latch LO) */
case 0:
if (cdsp->line_ctrl & LC_DIV_ACC)
rs = cdsp->div_latch[DIV_LATCH_LOW];
else {
rs = 0x60;
r = read_char(cdsp);
if (r != -1)
rs = (unsigned char)r;
}
break;
/* 0x03F9 - (interrupt enable) or (divisor latch HI) */
case 1:
if (cdsp->line_ctrl & LC_DIV_ACC)
rs = cdsp->div_latch[DIV_LATCH_HIGH];
else
rs = cdsp->int_enable;
break;
/* 0x03FA - interrupt identification register */
case 2:
rs = get_int_id(cdsp);
break;
/* 0x03FB - line control register */
case 3:
rs = cdsp->line_ctrl;
break;
/* 0x03FC - modem control register */
case 4:
rs = cdsp->modem_ctrl;
break;
/* 0x03FD - line status register */
case 5:
rs = get_status(cdsp);
break;
/* 0x03FE - modem status register */
case 6:
rs = cdsp->modem_stat | MS_DCD | MS_DSR | MS_CTS;
break;
/* 0x03FF - spare register */
case 7:
rs = cdsp->uart_spare;
break;
default:
debug(D_PORT, "com_port_in: illegal port index 0x%04x - 0x%04x\n",
port, cdsp->addr);
break;
}
return rs;
}
/* called when DOS wants to write directly to a physical port */
void
com_port_out(int port, unsigned char val)
{
struct com_data_struct *cdsp;
int i;
/* search for a valid COM ???or MOUSE??? port */
for (i = 0; i < N_COMS_MAX; i++) {
if (com_data[i].addr == ((unsigned short)port & 0xfff8)) {
cdsp = &(com_data[i]);
break;
}
}
if (i == N_COMS_MAX) {
debug(D_PORT, "com port 0x%04x not found\n", port);
return;
}
switch (port - cdsp->addr) {
/* 0x03F8 - (transmit buffer) or (divisor latch LO) */
case 0:
if (cdsp->line_ctrl & LC_DIV_ACC) {
cdsp->div_latch[DIV_LATCH_LOW] = val;
try_set_speed(cdsp);
} else {
write_char(cdsp, val);
}
break;
/* 0x03F9 - (interrupt enable) or (divisor latch HI) */
case 1:
if (cdsp->line_ctrl & LC_DIV_ACC) {
cdsp->div_latch[DIV_LATCH_HIGH] = val;
try_set_speed(cdsp);
} else {
cdsp->int_enable = val;
new_ii(cdsp);
}
break;
/* 0x03FA - FIFO control register */
case 2:
cdsp->fifo_ctrl = val & (FC_FIFO_EN | FC_FIFO_SZ_MASK);
if (val & FC_FIFO_CRV)
cdsp->ids = 0;
if (val & FC_FIFO_CTR) {
cdsp->ods = 0;
cdsp->emptyint = 1;
}
input(cdsp, 1);
manage_int(cdsp);
break;
/* 0x03FB - line control register */
case 3:
cdsp->line_ctrl = val;
break;
/* 0x03FC - modem control register */
case 4:
cdsp->modem_ctrl = val;
break;
/* 0x03FD - line status register */
case 5:
/* read-only */
break;
/* 0x03FE - modem status register */
case 6:
cdsp->modem_stat = val;
break;
/* 0x03FF - spare register */
case 7:
cdsp->uart_spare = val;
break;
default:
debug(D_PORT, "com_port_out: illegal port index 0x%04x - 0x%04x\n",
port, cdsp->addr);
break;
}
}
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