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Bochs/bochs/iodev/serial.cc
Volker Ruppert 2ef7ec8973 - new function raise_interrupt() manages the serial interrupt reasons 
- the line status register only causes an interrupt if an error occurs
- missing initial baurate value added (using 115200)
- baudrate divisor value checks fixed
2003-10-31 17:23:56 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id: serial.cc,v 1.40 2003-10-31 17:23:56 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// Peter Grehan (grehan@iprg.nokia.com) coded most of this
// serial emulation. Here's some notes from his implementation:
// Implement a single 16450, and allow terminal input/output to stdout
// on some platforms. 16550/16550a/16552 should be easy: just add code
// to handle a FIFO. I only did what was needed to get console output.
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "bochs.h"
#define LOG_THIS theSerialDevice->
#if USE_RAW_SERIAL
#include <signal.h>
#endif
#ifdef WIN32
#ifndef __MINGW32__
// +++
//#include <winsock2.h>
#include <winsock.h>
#endif
#endif
#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__linux__) || defined(__GNU__) || defined(__APPLE__)
#define SERIAL_ENABLE
#endif
#ifdef SERIAL_ENABLE
extern "C" {
#include <termios.h>
};
#endif
#ifdef SERIAL_ENABLE
static struct termios term_orig, term_new;
#endif
static int tty_id;
bx_serial_c *theSerialDevice = NULL;
int
libserial_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
{
theSerialDevice = new bx_serial_c ();
bx_devices.pluginSerialDevice = theSerialDevice;
BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theSerialDevice, BX_PLUGIN_SERIAL);
return(0); // Success
}
void
libserial_LTX_plugin_fini(void)
{
}
bx_serial_c::bx_serial_c(void)
{
put("SER");
settype(SERLOG);
tty_id = -1;
for (int i=0; i<BX_SERIAL_MAXDEV; i++) {
s[i].tx_timer_index = BX_NULL_TIMER_HANDLE;
s[i].rx_timer_index = BX_NULL_TIMER_HANDLE;
}
}
bx_serial_c::~bx_serial_c(void)
{
#ifdef SERIAL_ENABLE
if ((bx_options.com[0].Oenabled->get ()) && (tty_id >= 0))
tcsetattr(tty_id, TCSAFLUSH, &term_orig);
#endif
// nothing for now
}
void
bx_serial_c::init(void)
{
Bit16u ports[BX_SERIAL_MAXDEV] = {0x03f8, 0x02f8, 0x03e8, 0x02e8};
char name[16];
if (!bx_options.com[0].Oenabled->get ())
return;
#ifdef SERIAL_ENABLE
if (strlen(bx_options.com[0].Odev->getptr ()) > 0) {
tty_id = open(bx_options.com[0].Odev->getptr (), O_RDWR|O_NONBLOCK,600);
if (tty_id < 0)
BX_PANIC(("open of %s (%s) failed\n",
"com1", bx_options.com[0].Odev->getptr ()));
BX_DEBUG(("tty_id: %d",tty_id));
tcgetattr(tty_id, &term_orig);
bcopy((caddr_t) &term_orig, (caddr_t) &term_new, sizeof(struct termios));
cfmakeraw(&term_new);
term_new.c_oflag |= OPOST | ONLCR; // Enable NL to CR-NL translation
#ifndef TRUE_CTLC
// ctl-C will exit Bochs, or trap to the debugger
term_new.c_iflag &= ~IGNBRK;
term_new.c_iflag |= BRKINT;
term_new.c_lflag |= ISIG;
#else
// ctl-C will be delivered to the serial port
term_new.c_iflag |= IGNBRK;
term_new.c_iflag &= ~BRKINT;
#endif /* !def TRUE_CTLC */
term_new.c_iflag = 0;
term_new.c_oflag = 0;
term_new.c_cflag = CS8|CREAD|CLOCAL;
term_new.c_lflag = 0;
term_new.c_cc[VMIN] = 1;
term_new.c_cc[VTIME] = 0;
//term_new.c_iflag |= IXOFF;
tcsetattr(tty_id, TCSAFLUSH, &term_new);
}
#endif /* def SERIAL_ENABLE */
// nothing for now
#if USE_RAW_SERIAL
this->raw = new serial_raw("/dev/cua0", SIGUSR1);
#endif // USE_RAW_SERIAL
/*
* Put the UART registers into their RESET state
*/
for (unsigned i=0; i<BX_N_SERIAL_PORTS; i++) {
if (bx_options.com[i].Oenabled->get ()) {
sprintf(name, "Serial Port %d", i + 1);
/* serial interrupt */
BX_SER_THIS s[i].IRQ = 4 - (i & 1);
if (i < 2) {
DEV_register_irq(BX_SER_THIS s[i].IRQ, name);
}
/* internal state */
BX_SER_THIS s[i].ls_ipending = 0;
BX_SER_THIS s[i].ms_ipending = 0;
BX_SER_THIS s[i].rx_ipending = 0;
BX_SER_THIS s[i].ls_interrupt = 0;
BX_SER_THIS s[i].ms_interrupt = 0;
BX_SER_THIS s[i].rx_interrupt = 0;
BX_SER_THIS s[i].tx_interrupt = 0;
if (BX_SER_THIS s[i].tx_timer_index == BX_NULL_TIMER_HANDLE) {
BX_SER_THIS s[i].tx_timer_index =
bx_pc_system.register_timer(this, tx_timer_handler, 0,
0,0, "serial.tx"); // one-shot, inactive
}
if (BX_SER_THIS s[i].rx_timer_index == BX_NULL_TIMER_HANDLE) {
BX_SER_THIS s[i].rx_timer_index =
bx_pc_system.register_timer(this, rx_timer_handler, 0,
0,0, "serial.rx"); // one-shot, inactive
}
BX_SER_THIS s[i].rx_pollstate = BX_SER_RXIDLE;
/* int enable: b0000 0000 */
BX_SER_THIS s[i].int_enable.rxdata_enable = 0;
BX_SER_THIS s[i].int_enable.txhold_enable = 0;
BX_SER_THIS s[i].int_enable.rxlstat_enable = 0;
BX_SER_THIS s[i].int_enable.modstat_enable = 0;
/* int ID: b0000 0001 */
BX_SER_THIS s[i].int_ident.ipending = 1;
BX_SER_THIS s[i].int_ident.int_ID = 0;
BX_SER_THIS s[i].int_ident.fifo_enabled = 0;
/* FIFO control: b0000 0000 */
BX_SER_THIS s[i].fifo_cntl.enable = 0;
BX_SER_THIS s[i].fifo_cntl.rxreset = 0;
BX_SER_THIS s[i].fifo_cntl.txreset = 0;
BX_SER_THIS s[i].fifo_cntl.dmamode = 0;
BX_SER_THIS s[i].fifo_cntl.rxtrigger = 0;
/* Line Control reg: b0000 0000 */
BX_SER_THIS s[i].line_cntl.wordlen_sel = 0;
BX_SER_THIS s[i].line_cntl.stopbits = 0;
BX_SER_THIS s[i].line_cntl.parity_enable = 0;
BX_SER_THIS s[i].line_cntl.evenparity_sel = 0;
BX_SER_THIS s[i].line_cntl.stick_parity = 0;
BX_SER_THIS s[i].line_cntl.break_cntl = 0;
BX_SER_THIS s[i].line_cntl.dlab = 0;
/* Modem Control reg: b0000 0000 */
BX_SER_THIS s[i].modem_cntl.dtr = 0;
BX_SER_THIS s[i].modem_cntl.rts = 0;
BX_SER_THIS s[i].modem_cntl.out1 = 0;
BX_SER_THIS s[i].modem_cntl.out2 = 0;
BX_SER_THIS s[i].modem_cntl.local_loopback = 0;
/* Line Status register: b0110 0000 */
BX_SER_THIS s[i].line_status.rxdata_ready = 0;
BX_SER_THIS s[i].line_status.overrun_error = 0;
BX_SER_THIS s[i].line_status.parity_error = 0;
BX_SER_THIS s[i].line_status.framing_error = 0;
BX_SER_THIS s[i].line_status.break_int = 0;
BX_SER_THIS s[i].line_status.thr_empty = 1;
BX_SER_THIS s[i].line_status.tsr_empty = 1;
BX_SER_THIS s[i].line_status.fifo_error = 0;
/* Modem Status register: bXXXX 0000 */
BX_SER_THIS s[i].modem_status.delta_cts = 0;
BX_SER_THIS s[i].modem_status.delta_dsr = 0;
BX_SER_THIS s[i].modem_status.ri_trailedge = 0;
BX_SER_THIS s[i].modem_status.delta_dcd = 0;
BX_SER_THIS s[i].modem_status.cts = 0;
BX_SER_THIS s[i].modem_status.dsr = 0;
BX_SER_THIS s[i].modem_status.ri = 0;
BX_SER_THIS s[i].modem_status.dcd = 0;
BX_SER_THIS s[i].scratch = 0; /* scratch register */
BX_SER_THIS s[i].divisor_lsb = 1; /* divisor-lsb register */
BX_SER_THIS s[i].divisor_msb = 0; /* divisor-msb register */
BX_SER_THIS s[i].baudrate = 115200;
for (unsigned addr=ports[i]; addr<(unsigned)(ports[i]+8); addr++) {
BX_DEBUG(("register read/write: 0x%04x",addr));
DEV_register_ioread_handler(this, read_handler, addr, name, 1);
DEV_register_iowrite_handler(this, write_handler, addr, name, 1);
}
BX_INFO(("com%d at 0x%04x irq %d", i+1, ports[i], BX_SER_THIS s[i].IRQ));
}
}
}
void
bx_serial_c::reset(unsigned type)
{
}
void
bx_serial_c::lower_interrupt(Bit8u port)
{
/* If there are no more ints pending, clear the irq */
if ((BX_SER_THIS s[port].rx_interrupt == 0) &&
(BX_SER_THIS s[port].tx_interrupt == 0) &&
(BX_SER_THIS s[port].ls_interrupt == 0) &&
(BX_SER_THIS s[port].ms_interrupt == 0)) {
DEV_pic_lower_irq(BX_SER_THIS s[port].IRQ);
}
}
void
bx_serial_c::raise_interrupt(Bit8u port, int type)
{
bx_bool gen_int = 0;
switch (type) {
case BX_SER_INT_IER: /* IER has changed */
gen_int = 1;
break;
case BX_SER_INT_RXDATA:
if (BX_SER_THIS s[port].int_enable.rxdata_enable) {
BX_SER_THIS s[port].rx_interrupt = 1;
gen_int = 1;
} else {
BX_SER_THIS s[port].rx_ipending = 1;
}
break;
case BX_SER_INT_TXHOLD:
if (BX_SER_THIS s[port].int_enable.txhold_enable) {
BX_SER_THIS s[port].tx_interrupt = 1;
gen_int = 1;
}
break;
case BX_SER_INT_RXLSTAT:
if (BX_SER_THIS s[port].int_enable.rxlstat_enable) {
BX_SER_THIS s[port].ls_interrupt = 1;
gen_int = 1;
} else {
BX_SER_THIS s[port].ls_ipending = 1;
}
break;
case BX_SER_INT_MODSTAT:
if ((BX_SER_THIS s[port].ms_ipending == 1) &&
(BX_SER_THIS s[port].int_enable.modstat_enable == 1)) {
BX_SER_THIS s[port].ms_interrupt = 1;
BX_SER_THIS s[port].ms_ipending = 0;
gen_int = 1;
}
break;
}
if (gen_int && BX_SER_THIS s[port].modem_cntl.out2) {
DEV_pic_raise_irq(BX_SER_THIS s[port].IRQ);
}
}
// static IO port read callback handler
// redirects to non-static class handler to avoid virtual functions
Bit32u
bx_serial_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_SER_SMF
bx_serial_c *class_ptr = (bx_serial_c *) this_ptr;
return( class_ptr->read(address, io_len) );
}
Bit32u
bx_serial_c::read(Bit32u address, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_SER_SMF
//UNUSED(address);
Bit8u val;
/* SERIAL PORT 1 */
BX_DEBUG(("register read from address 0x%04x - ", (unsigned) address));
switch (address) {
case 0x03F8: /* receive buffer, or divisor latch LSB if DLAB set */
if (BX_SER_THIS s[0].line_cntl.dlab) {
val = BX_SER_THIS s[0].divisor_lsb;
} else {
val = BX_SER_THIS s[0].rxbuffer;
BX_SER_THIS s[0].line_status.rxdata_ready = 0;
BX_SER_THIS s[0].rx_interrupt = 0;
BX_SER_THIS s[0].rx_ipending = 0;
lower_interrupt(0);
}
break;
case 0x03F9: /* interrupt enable register, or div. latch MSB */
if (BX_SER_THIS s[0].line_cntl.dlab) {
val = BX_SER_THIS s[0].divisor_msb;
} else {
val = BX_SER_THIS s[0].int_enable.rxdata_enable |
(BX_SER_THIS s[0].int_enable.txhold_enable << 1) |
(BX_SER_THIS s[0].int_enable.rxlstat_enable << 2) |
(BX_SER_THIS s[0].int_enable.modstat_enable << 3);
}
break;
case 0x03FA: /* interrupt ID register */
/*
* Set the interrupt ID based on interrupt source
*/
if (BX_SER_THIS s[0].ls_interrupt) {
BX_SER_THIS s[0].int_ident.int_ID = 0x3;
BX_SER_THIS s[0].int_ident.ipending = 0;
} else if (BX_SER_THIS s[0].rx_interrupt) {
BX_SER_THIS s[0].int_ident.int_ID = 0x2;
BX_SER_THIS s[0].int_ident.ipending = 0;
} else if (BX_SER_THIS s[0].tx_interrupt) {
BX_SER_THIS s[0].int_ident.int_ID = 0x1;
BX_SER_THIS s[0].int_ident.ipending = 0;
} else if (BX_SER_THIS s[0].ms_interrupt) {
BX_SER_THIS s[0].int_ident.int_ID = 0x0;
BX_SER_THIS s[0].int_ident.ipending = 0;
} else {
BX_SER_THIS s[0].int_ident.int_ID = 0x0;
BX_SER_THIS s[0].int_ident.ipending = 1;
}
BX_SER_THIS s[0].tx_interrupt = 0;
lower_interrupt(0);
val = BX_SER_THIS s[0].int_ident.ipending |
(BX_SER_THIS s[0].int_ident.int_ID << 1) |
(BX_SER_THIS s[0].int_ident.fifo_enabled << 6);
break;
case 0x03FB: /* Line control register */
val = BX_SER_THIS s[0].line_cntl.wordlen_sel |
(BX_SER_THIS s[0].line_cntl.stopbits << 2) |
(BX_SER_THIS s[0].line_cntl.parity_enable << 3) |
(BX_SER_THIS s[0].line_cntl.evenparity_sel << 4) |
(BX_SER_THIS s[0].line_cntl.stick_parity << 5) |
(BX_SER_THIS s[0].line_cntl.break_cntl << 6) |
(BX_SER_THIS s[0].line_cntl.dlab << 7);
break;
case 0x03FC: /* MODEM control register */
val = BX_SER_THIS s[0].modem_cntl.dtr |
(BX_SER_THIS s[0].modem_cntl.rts << 1) |
(BX_SER_THIS s[0].modem_cntl.out1 << 2) |
(BX_SER_THIS s[0].modem_cntl.out2 << 3) |
(BX_SER_THIS s[0].modem_cntl.local_loopback << 4);
break;
case 0x03FD: /* Line status register */
val = BX_SER_THIS s[0].line_status.rxdata_ready |
(BX_SER_THIS s[0].line_status.overrun_error << 1) |
(BX_SER_THIS s[0].line_status.parity_error << 2) |
(BX_SER_THIS s[0].line_status.framing_error << 3) |
(BX_SER_THIS s[0].line_status.break_int << 4) |
(BX_SER_THIS s[0].line_status.thr_empty << 5) |
(BX_SER_THIS s[0].line_status.tsr_empty << 6) |
(BX_SER_THIS s[0].line_status.fifo_error << 7);
BX_SER_THIS s[0].line_status.overrun_error = 0;
BX_SER_THIS s[0].line_status.break_int = 0;
BX_SER_THIS s[0].ls_interrupt = 0;
BX_SER_THIS s[0].ls_ipending = 0;
lower_interrupt(0);
break;
case 0x03FE: /* MODEM status register */
val = BX_SER_THIS s[0].modem_status.delta_cts |
(BX_SER_THIS s[0].modem_status.delta_dsr << 1) |
(BX_SER_THIS s[0].modem_status.ri_trailedge << 2) |
(BX_SER_THIS s[0].modem_status.delta_dcd << 3) |
(BX_SER_THIS s[0].modem_status.cts << 4) |
(BX_SER_THIS s[0].modem_status.dsr << 5) |
(BX_SER_THIS s[0].modem_status.ri << 6) |
(BX_SER_THIS s[0].modem_status.dcd << 7);
BX_SER_THIS s[0].modem_status.delta_cts = 0;
BX_SER_THIS s[0].modem_status.delta_dsr = 0;
BX_SER_THIS s[0].modem_status.ri_trailedge = 0;
BX_SER_THIS s[0].modem_status.delta_dcd = 0;
BX_SER_THIS s[0].ms_interrupt = 0;
BX_SER_THIS s[0].ms_ipending = 0;
lower_interrupt(0);
break;
case 0x03FF: /* scratch register */
val = BX_SER_THIS s[0].scratch;
break;
default:
val = 0; // keep compiler happy
BX_PANIC(("unsupported io read from address=0x%04x!",
(unsigned) address));
break;
}
BX_DEBUG(("val = 0x%02x", (unsigned) val));
return(val);
}
// static IO port write callback handler
// redirects to non-static class handler to avoid virtual functions
void
bx_serial_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_SER_SMF
bx_serial_c *class_ptr = (bx_serial_c *) this_ptr;
class_ptr->write(address, value, io_len);
}
void
bx_serial_c::write(Bit32u address, Bit32u value, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_SER_SMF
bx_bool prev_cts, prev_dsr, prev_ri, prev_dcd;
bx_bool new_rx_ien, new_tx_ien, new_ls_ien, new_ms_ien;
bx_bool gen_int = 0;
/* SERIAL PORT 1 */
BX_DEBUG(("write to address: 0x%04x = 0x%02x",
(unsigned) address, (unsigned) value));
switch (address) {
case 0x03F8: /* transmit buffer, or divisor latch LSB if DLAB set */
if (BX_SER_THIS s[0].line_cntl.dlab) {
BX_SER_THIS s[0].divisor_lsb = value;
if ((value != 0) || (BX_SER_THIS s[0].divisor_msb != 0)) {
BX_SER_THIS s[0].baudrate = (int) (BX_PC_CLOCK_XTL /
(16 * ((BX_SER_THIS s[0].divisor_msb << 8) |
BX_SER_THIS s[0].divisor_lsb)));
#if USE_RAW_SERIAL
BX_SER_THIS raw->set_baudrate(BX_SER_THIS s[0].baudrate);
#endif // USE_RAW_SERIAL
}
} else {
if (BX_SER_THIS s[0].line_status.thr_empty) {
Bit8u bitmask = 0xff >> (3 - BX_SER_THIS s[0].line_cntl.wordlen_sel);
BX_SER_THIS s[0].thrbuffer = value & bitmask;
if (BX_SER_THIS s[0].line_status.tsr_empty) {
BX_SER_THIS s[0].tsrbuffer = BX_SER_THIS s[0].thrbuffer;
BX_SER_THIS s[0].line_status.tsr_empty = 0;
raise_interrupt(0, BX_SER_INT_TXHOLD);
bx_pc_system.activate_timer(BX_SER_THIS s[0].tx_timer_index,
(int) (1000000.0 / BX_SER_THIS s[0].baudrate *
(BX_SER_THIS s[0].line_cntl.wordlen_sel + 5)),
0); /* not continuous */
} else {
BX_SER_THIS s[0].line_status.thr_empty = 0;
BX_SER_THIS s[0].tx_interrupt = 0;
lower_interrupt(0);
}
} else {
BX_ERROR(("write to tx hold register when not empty"));
}
}
break;
case 0x03F9: /* interrupt enable register, or div. latch MSB */
if (BX_SER_THIS s[0].line_cntl.dlab) {
BX_SER_THIS s[0].divisor_msb = value;
if ((value != 0) || (BX_SER_THIS s[0].divisor_lsb != 0)) {
BX_SER_THIS s[0].baudrate = (int) (BX_PC_CLOCK_XTL /
(16 * ((BX_SER_THIS s[0].divisor_msb << 8) |
BX_SER_THIS s[0].divisor_lsb)));
#if USE_RAW_SERIAL
BX_SER_THIS raw->set_baudrate(BX_SER_THIS s[0].baudrate);
#endif // USE_RAW_SERIAL
}
} else {
new_rx_ien = value & 0x01;
new_tx_ien = (value & 0x02) >> 1;
new_ls_ien = (value & 0x04) >> 2;
new_ms_ien = (value & 0x08) >> 3;
if (new_ms_ien != BX_SER_THIS s[0].int_enable.modstat_enable) {
BX_SER_THIS s[0].int_enable.modstat_enable = new_ms_ien;
if (BX_SER_THIS s[0].int_enable.modstat_enable == 1) {
if (BX_SER_THIS s[0].ms_ipending == 1) {
BX_SER_THIS s[0].ms_interrupt = 1;
BX_SER_THIS s[0].ms_ipending = 0;
gen_int = 1;
}
} else {
if (BX_SER_THIS s[0].ms_interrupt == 1) {
BX_SER_THIS s[0].ms_interrupt = 0;
BX_SER_THIS s[0].ms_ipending = 1;
lower_interrupt(0);
}
}
}
if (new_tx_ien != BX_SER_THIS s[0].int_enable.txhold_enable) {
BX_SER_THIS s[0].int_enable.txhold_enable = new_tx_ien;
if (BX_SER_THIS s[0].int_enable.txhold_enable == 1) {
BX_SER_THIS s[0].tx_interrupt = BX_SER_THIS s[0].line_status.thr_empty;
if (BX_SER_THIS s[0].tx_interrupt) gen_int = 1;
} else {
BX_SER_THIS s[0].tx_interrupt = 0;
lower_interrupt(0);
}
}
if (new_rx_ien != BX_SER_THIS s[0].int_enable.rxdata_enable) {
BX_SER_THIS s[0].int_enable.rxdata_enable = new_rx_ien;
if (BX_SER_THIS s[0].int_enable.rxdata_enable == 1) {
if (BX_SER_THIS s[0].rx_ipending == 1) {
BX_SER_THIS s[0].rx_interrupt = 1;
BX_SER_THIS s[0].rx_ipending = 0;
gen_int = 1;
}
} else {
if (BX_SER_THIS s[0].rx_interrupt == 1) {
BX_SER_THIS s[0].rx_interrupt = 0;
BX_SER_THIS s[0].rx_ipending = 1;
lower_interrupt(0);
}
}
}
if (new_ls_ien != BX_SER_THIS s[0].int_enable.rxlstat_enable) {
BX_SER_THIS s[0].int_enable.rxlstat_enable = new_ls_ien;
if (BX_SER_THIS s[0].int_enable.rxlstat_enable == 1) {
if (BX_SER_THIS s[0].ls_ipending == 1) {
BX_SER_THIS s[0].ls_interrupt = 1;
BX_SER_THIS s[0].ls_ipending = 0;
gen_int = 1;
}
} else {
if (BX_SER_THIS s[0].ls_interrupt == 1) {
BX_SER_THIS s[0].ls_interrupt = 0;
BX_SER_THIS s[0].ls_ipending = 1;
lower_interrupt(0);
}
}
}
if (gen_int) raise_interrupt(0, BX_SER_INT_IER);
}
break;
case 0x03FA: /* FIFO control register */
/* Ignore until FIFO mode is supported... */
break;
case 0x03FB: /* Line control register */
#if !USE_RAW_SERIAL
if ((value & 0x3) != 0x3) {
/* ignore this: this is set by FreeBSD when the console
code wants to set DLAB */
}
#endif // !USE_RAW_SERIAL
#if USE_RAW_SERIAL
if (BX_SER_THIS s[0].line_cntl.wordlen_sel != (value & 0x3)) {
BX_SER_THIS raw->set_data_bits((value & 0x3) + 5);
}
if (BX_SER_THIS s[0].line_cntl.stopbits != (value & 0x4) >> 2) {
BX_SER_THIS raw->set_stop_bits((value & 0x4 >> 2) ? 2 : 1);
}
if (BX_SER_THIS s[0].line_cntl.parity_enable != (value & 0x8) >> 3 ||
BX_SER_THIS s[0].line_cntl.evenparity_sel != (value & 0x10) >> 4 ||
BX_SER_THIS s[0].line_cntl.stick_parity != (value & 0x20) >> 5) {
if (((value & 0x20) >> 5) &&
((value & 0x8) >> 3))
BX_PANIC(("sticky parity set and parity enabled"));
BX_SER_THIS raw->set_parity_mode(((value & 0x8) >> 3),
((value & 0x10) >> 4) ? P_EVEN : P_ODD);
}
if (BX_SER_THIS s[0].line_cntl.break_cntl && !((value & 0x40) >> 6)) {
BX_SER_THIS raw->transmit(C_BREAK);
}
#endif // USE_RAW_SERIAL
BX_SER_THIS s[0].line_cntl.wordlen_sel = value & 0x3;
/* These are ignored, but set them up so they can be read back */
BX_SER_THIS s[0].line_cntl.stopbits = (value & 0x4) >> 2;
BX_SER_THIS s[0].line_cntl.parity_enable = (value & 0x8) >> 3;
BX_SER_THIS s[0].line_cntl.evenparity_sel = (value & 0x10) >> 4;
BX_SER_THIS s[0].line_cntl.stick_parity = (value & 0x20) >> 5;
BX_SER_THIS s[0].line_cntl.break_cntl = (value & 0x40) >> 6;
/* used when doing future writes */
if (BX_SER_THIS s[0].line_cntl.dlab &&
!((value & 0x80) >> 7)) {
// Start the receive polling process if not already started
// and there is a valid baudrate.
if (BX_SER_THIS s[0].rx_pollstate == BX_SER_RXIDLE &&
BX_SER_THIS s[0].baudrate != 0) {
BX_SER_THIS s[0].rx_pollstate = BX_SER_RXPOLL;
bx_pc_system.activate_timer(BX_SER_THIS s[0].rx_timer_index,
(int) (1000000.0 / BX_SER_THIS s[0].baudrate *
(BX_SER_THIS s[0].line_cntl.wordlen_sel + 5)),
0); /* not continuous */
}
BX_DEBUG(("baud rate set - %d", BX_SER_THIS s[0].baudrate));
}
BX_SER_THIS s[0].line_cntl.dlab = (value & 0x80) >> 7;
break;
case 0x03FC: /* MODEM control register */
if ((value & 0x01) == 0) {
#if USE_RAW_SERIAL
BX_SER_THIS raw->send_hangup();
#endif
}
BX_SER_THIS s[0].modem_cntl.dtr = value & 0x01;
BX_SER_THIS s[0].modem_cntl.rts = (value & 0x02) >> 1;
BX_SER_THIS s[0].modem_cntl.out1 = (value & 0x04) >> 2;
BX_SER_THIS s[0].modem_cntl.out2 = (value & 0x08) >> 3;
BX_SER_THIS s[0].modem_cntl.local_loopback = (value & 0x10) >> 4;
if (BX_SER_THIS s[0].modem_cntl.local_loopback) {
prev_cts = BX_SER_THIS s[0].modem_status.cts;
prev_dsr = BX_SER_THIS s[0].modem_status.dsr;
prev_ri = BX_SER_THIS s[0].modem_status.ri;
prev_dcd = BX_SER_THIS s[0].modem_status.dcd;
BX_SER_THIS s[0].modem_status.cts = BX_SER_THIS s[0].modem_cntl.rts;
BX_SER_THIS s[0].modem_status.dsr = BX_SER_THIS s[0].modem_cntl.dtr;
BX_SER_THIS s[0].modem_status.ri = BX_SER_THIS s[0].modem_cntl.out1;
BX_SER_THIS s[0].modem_status.dcd = BX_SER_THIS s[0].modem_cntl.out2;
if (BX_SER_THIS s[0].modem_status.cts != prev_cts) {
BX_SER_THIS s[0].modem_status.delta_cts = 1;
BX_SER_THIS s[0].ms_ipending = 1;
}
if (BX_SER_THIS s[0].modem_status.dsr != prev_dsr) {
BX_SER_THIS s[0].modem_status.delta_dsr = 1;
BX_SER_THIS s[0].ms_ipending = 1;
}
if (BX_SER_THIS s[0].modem_status.ri != prev_ri)
BX_SER_THIS s[0].ms_ipending = 1;
if ((BX_SER_THIS s[0].modem_status.ri == 0) && (prev_ri == 1))
BX_SER_THIS s[0].modem_status.ri_trailedge = 1;
if (BX_SER_THIS s[0].modem_status.dcd != prev_dcd) {
BX_SER_THIS s[0].modem_status.delta_dcd = 1;
BX_SER_THIS s[0].ms_ipending = 1;
}
raise_interrupt(0, BX_SER_INT_MODSTAT);
} else {
/* set these to 0 for the time being */
BX_SER_THIS s[0].modem_status.cts = 0;
BX_SER_THIS s[0].modem_status.dsr = 0;
BX_SER_THIS s[0].modem_status.ri = 0;
BX_SER_THIS s[0].modem_status.dcd = 0;
}
break;
case 0x03FD: /* Line status register */
BX_ERROR(("write to line status register ignored"));
break;
case 0x03FE: /* MODEM status register */
BX_ERROR(("write to MODEM status register ignored"));
break;
case 0x03FF: /* scratch register */
BX_SER_THIS s[0].scratch = value;
break;
default:
BX_PANIC(("unsupported io write to address=0x%04x, value = 0x%02x!",
(unsigned) address, (unsigned) value));
break;
}
}
void
bx_serial_c::tx_timer_handler(void *this_ptr)
{
bx_serial_c *class_ptr = (bx_serial_c *) this_ptr;
class_ptr->tx_timer();
}
void
bx_serial_c::tx_timer(void)
{
if (BX_SER_THIS s[0].modem_cntl.local_loopback) {
if (BX_SER_THIS s[0].line_status.rxdata_ready == 1) {
BX_SER_THIS s[0].line_status.overrun_error = 1;
raise_interrupt(0, BX_SER_INT_RXLSTAT);
}
BX_SER_THIS s[0].rxbuffer = BX_SER_THIS s[0].tsrbuffer;
BX_SER_THIS s[0].line_status.rxdata_ready = 1;
raise_interrupt(0, BX_SER_INT_RXDATA);
} else {
#if USE_RAW_SERIAL
if (!BX_SER_THIS raw->ready_transmit())
BX_PANIC(("Not ready to transmit"));
BX_SER_THIS raw->transmit(BX_SER_THIS s[0].tsrbuffer);
#endif
#if defined(SERIAL_ENABLE)
BX_DEBUG(("write: '%c'", BX_SER_THIS s[0].tsrbuffer));
if (tty_id >= 0) write(tty_id, (bx_ptr_t) & BX_SER_THIS s[0].tsrbuffer, 1);
#endif
}
if (!BX_SER_THIS s[0].line_status.thr_empty) {
BX_SER_THIS s[0].tsrbuffer = BX_SER_THIS s[0].thrbuffer;
BX_SER_THIS s[0].line_status.thr_empty = 1;
raise_interrupt(0, BX_SER_INT_TXHOLD);
bx_pc_system.activate_timer(BX_SER_THIS s[0].tx_timer_index,
(int) (1000000.0 / BX_SER_THIS s[0].baudrate *
(BX_SER_THIS s[0].line_cntl.wordlen_sel + 5)),
0); /* not continuous */
} else {
BX_SER_THIS s[0].line_status.tsr_empty = 1;
}
}
void
bx_serial_c::rx_timer_handler(void *this_ptr)
{
bx_serial_c *class_ptr = (bx_serial_c *) this_ptr;
class_ptr->rx_timer();
}
void
bx_serial_c::rx_timer(void)
{
#if BX_HAVE_SELECT
#ifndef __BEOS__
struct timeval tval;
fd_set fds;
#endif
#endif
int bdrate = BX_SER_THIS s[0].baudrate / (BX_SER_THIS s[0].line_cntl.wordlen_sel + 5);
unsigned char chbuf = 0;
#if BX_HAVE_SELECT
#ifndef __BEOS__
tval.tv_sec = 0;
tval.tv_usec = 0;
// MacOS: I'm not sure what to do with this, since I don't know
// what an fd_set is or what FD_SET() or select() do. They aren't
// declared in the CodeWarrior standard library headers. I'm just
// leaving it commented out for the moment.
FD_ZERO(&fds);
if (tty_id >= 0) FD_SET(tty_id, &fds);
if (BX_SER_THIS s[0].line_status.rxdata_ready == 0) {
#if USE_RAW_SERIAL
bx_bool rdy;
uint16 data;
if ((rdy = BX_SER_THIS raw->ready_receive())) {
data = BX_SER_THIS raw->receive();
if (data == C_BREAK) {
BX_DEBUG(("got BREAK"));
BX_SER_THIS s[0].line_status.break_int = 1;
rdy = 0;
}
}
if (rdy) {
chbuf = data;
#elif defined(SERIAL_ENABLE)
if ((tty_id >= 0) && (select(tty_id + 1, &fds, NULL, NULL, &tval) == 1)) {
(void) read(tty_id, &chbuf, 1);
BX_DEBUG(("read: '%c'",chbuf));
#else
if (0) {
#endif
if (!BX_SER_THIS s[0].modem_cntl.local_loopback) {
if (BX_SER_THIS s[0].line_status.rxdata_ready == 1) {
BX_SER_THIS s[0].line_status.overrun_error = 1;
raise_interrupt(0, BX_SER_INT_RXLSTAT);
}
BX_SER_THIS s[0].rxbuffer = chbuf;
BX_SER_THIS s[0].line_status.rxdata_ready = 1;
raise_interrupt(0, BX_SER_INT_RXDATA);
}
} else {
bdrate = (int) (1000000.0 / 100000); // Poll frequency is 100ms
}
} else {
// Poll at 4x baud rate to see if the next-char can
// be read
bdrate *= 4;
}
#endif
#endif
bx_pc_system.activate_timer(BX_SER_THIS s[0].rx_timer_index,
(int) (1000000.0 / bdrate),
0); /* not continuous */
}
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