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/*
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* serial.c -- serial line simulation
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*/
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#ifdef __linux__
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#define _XOPEN_SOURCE
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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#include "common.h"
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#include "console.h"
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#include "error.h"
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#include "except.h"
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#include "cpu.h"
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#include "timer.h"
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#include "serial.h"
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/**************************************************************/
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static Bool debug = false;
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typedef struct {
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pid_t pid;
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FILE *in;
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FILE *out;
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Word rcvrCtrl;
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Word rcvrData;
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int rcvrIRQ;
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Word xmtrCtrl;
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Word xmtrData;
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int xmtrIRQ;
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} Serial;
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static Serial serials[MAX_NSERIALS];
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static int nSerials;
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/**************************************************************/
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static void rcvrCallback(int dev) {
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int c;
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if (debug) {
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cPrintf("\n**** SERIAL RCVR CALLBACK ****\n");
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}
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timerStart(SERIAL_RCVR_USEC, rcvrCallback, dev);
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c = fgetc(serials[dev].in);
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if (c == EOF) {
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/* no character typed */
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return;
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}
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/* any character typed */
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serials[dev].rcvrData = c & 0xFF;
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serials[dev].rcvrCtrl |= SERIAL_RCVR_RDY;
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if (serials[dev].rcvrCtrl & SERIAL_RCVR_IEN) {
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/* raise serial line rcvr interrupt */
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cpuSetInterrupt(serials[dev].rcvrIRQ);
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}
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}
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static void xmtrCallback(int dev) {
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if (debug) {
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cPrintf("\n**** SERIAL XMTR CALLBACK ****\n");
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}
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fputc(serials[dev].xmtrData & 0xFF, serials[dev].out);
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serials[dev].xmtrCtrl |= SERIAL_XMTR_RDY;
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if (serials[dev].xmtrCtrl & SERIAL_XMTR_IEN) {
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/* raise serial line xmtr interrupt */
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cpuSetInterrupt(serials[dev].xmtrIRQ);
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}
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}
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/**************************************************************/
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Word serialRead(Word addr) {
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int dev, reg;
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Word data;
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if (debug) {
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cPrintf("\n**** SERIAL READ from 0x%08X", addr);
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}
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dev = addr >> 12;
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if (dev >= nSerials) {
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/* illegal device */
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throwException(EXC_BUS_TIMEOUT);
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}
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reg = addr & 0x0FFF;
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if (reg == SERIAL_RCVR_CTRL) {
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data = serials[dev].rcvrCtrl;
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} else
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if (reg == SERIAL_RCVR_DATA) {
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serials[dev].rcvrCtrl &= ~SERIAL_RCVR_RDY;
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if (serials[dev].rcvrCtrl & SERIAL_RCVR_IEN) {
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/* lower serial line rcvr interrupt */
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cpuResetInterrupt(serials[dev].rcvrIRQ);
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}
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data = serials[dev].rcvrData;
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} else
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if (reg == SERIAL_XMTR_CTRL) {
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data = serials[dev].xmtrCtrl;
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} else
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if (reg == SERIAL_XMTR_DATA) {
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/* this register is write-only */
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throwException(EXC_BUS_TIMEOUT);
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} else {
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/* illegal register */
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throwException(EXC_BUS_TIMEOUT);
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}
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if (debug) {
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cPrintf(", data = 0x%08X ****\n", data);
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}
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return data;
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}
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void serialWrite(Word addr, Word data) {
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int dev, reg;
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if (debug) {
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cPrintf("\n**** SERIAL WRITE to 0x%08X, data = 0x%08X ****\n",
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addr, data);
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}
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dev = addr >> 12;
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if (dev >= nSerials) {
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/* illegal device */
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throwException(EXC_BUS_TIMEOUT);
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}
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reg = addr & 0x0FFF;
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if (reg == SERIAL_RCVR_CTRL) {
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if (data & SERIAL_RCVR_IEN) {
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serials[dev].rcvrCtrl |= SERIAL_RCVR_IEN;
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} else {
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serials[dev].rcvrCtrl &= ~SERIAL_RCVR_IEN;
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}
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if (data & SERIAL_RCVR_RDY) {
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serials[dev].rcvrCtrl |= SERIAL_RCVR_RDY;
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} else {
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serials[dev].rcvrCtrl &= ~SERIAL_RCVR_RDY;
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}
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if ((serials[dev].rcvrCtrl & SERIAL_RCVR_IEN) != 0 &&
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(serials[dev].rcvrCtrl & SERIAL_RCVR_RDY) != 0) {
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/* raise serial line rcvr interrupt */
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cpuSetInterrupt(serials[dev].rcvrIRQ);
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} else {
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/* lower serial line rcvr interrupt */
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cpuResetInterrupt(serials[dev].rcvrIRQ);
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}
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} else
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if (reg == SERIAL_RCVR_DATA) {
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/* this register is read-only */
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throwException(EXC_BUS_TIMEOUT);
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} else
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if (reg == SERIAL_XMTR_CTRL) {
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if (data & SERIAL_XMTR_IEN) {
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serials[dev].xmtrCtrl |= SERIAL_XMTR_IEN;
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} else {
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serials[dev].xmtrCtrl &= ~SERIAL_XMTR_IEN;
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}
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if (data & SERIAL_XMTR_RDY) {
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serials[dev].xmtrCtrl |= SERIAL_XMTR_RDY;
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} else {
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serials[dev].xmtrCtrl &= ~SERIAL_XMTR_RDY;
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}
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if ((serials[dev].xmtrCtrl & SERIAL_XMTR_IEN) != 0 &&
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(serials[dev].xmtrCtrl & SERIAL_XMTR_RDY) != 0) {
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/* raise serial line xmtr interrupt */
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cpuSetInterrupt(serials[dev].xmtrIRQ);
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} else {
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/* lower serial line xmtr interrupt */
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cpuResetInterrupt(serials[dev].xmtrIRQ);
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}
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} else
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if (reg == SERIAL_XMTR_DATA) {
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serials[dev].xmtrData = data & 0xFF;
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serials[dev].xmtrCtrl &= ~SERIAL_XMTR_RDY;
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if (serials[dev].xmtrCtrl & SERIAL_XMTR_IEN) {
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/* lower serial line xmtr interrupt */
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cpuResetInterrupt(serials[dev].xmtrIRQ);
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}
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timerStart(SERIAL_XMTR_USEC, xmtrCallback, dev);
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} else {
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/* illegal register */
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throwException(EXC_BUS_TIMEOUT);
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}
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}
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/**************************************************************/
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void serialReset(void) {
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int i;
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cPrintf("Resetting Serial Lines...\n");
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for (i = 0; i < nSerials; i++) {
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serials[i].rcvrCtrl = 0;
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serials[i].rcvrData = 0;
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serials[i].rcvrIRQ = IRQ_SERIAL_0_RCVR + 2 * i;
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timerStart(SERIAL_RCVR_USEC, rcvrCallback, i);
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serials[i].xmtrCtrl = SERIAL_XMTR_RDY;
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serials[i].xmtrData = 0;
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serials[i].xmtrIRQ = IRQ_SERIAL_0_XMTR + 2 * i;
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}
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}
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static void makeRaw(int fd) {
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struct termios t;
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tcgetattr(fd, &t);
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t.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
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t.c_oflag &= ~OPOST;
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t.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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t.c_cflag &= ~(CSIZE|PARENB);
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t.c_cflag |= CS8;
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tcsetattr(fd, TCSANOW, &t);
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}
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void serialInit(int numSerials, Bool connectTerminals[]) {
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int i;
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int master;
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char slavePath[100];
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int slave;
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char termTitle[100];
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char termSlave[100];
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nSerials = numSerials;
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for (i = 0; i < nSerials; i++) {
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/* open pseudo terminal */
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master = open("/dev/ptmx", O_RDWR | O_NONBLOCK);
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if (master < 0) {
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error("cannot open pseudo terminal master for serial line %d", i);
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}
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grantpt(master);
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unlockpt(master);
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strcpy(slavePath, ptsname(master));
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if (debug) {
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cPrintf("pseudo terminal %d: master fd = %d, slave path = '%s'\n",
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i, master, slavePath);
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}
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if (connectTerminals[i]) {
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/* connect a terminal to the serial line */
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/* i.e., fork and exec a new xterm process */
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serials[i].pid = fork();
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if (serials[i].pid < 0) {
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error("cannot fork xterm process for serial line %d", i);
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}
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if (serials[i].pid == 0) {
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/* terminal process */
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setpgid(0, 0);
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close(master);
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/* open and configure pseudo terminal slave */
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slave = open(slavePath, O_RDWR | O_NONBLOCK);
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if (slave < 0) {
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error("cannot open pseudo terminal slave '%s'\n", slavePath);
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}
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makeRaw(slave);
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/* exec xterm */
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sprintf(termTitle, "ECO32 Terminal %d", i);
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sprintf(termSlave, "-Sab%d", slave);
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execlp("xterm", "xterm", "-title", termTitle, termSlave, NULL);
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error("cannot exec xterm process for serial line %d", i);
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}
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} else {
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/* leave serial line unconnected */
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serials[i].pid = 0;
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cPrintf("Serial line %d can be accessed by opening device '%s'.\n",
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i, slavePath);
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}
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fcntl(master, F_SETFL, O_NONBLOCK);
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serials[i].in = fdopen(master, "r");
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setvbuf(serials[i].in, NULL, _IONBF, 0);
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serials[i].out = fdopen(master, "w");
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setvbuf(serials[i].out, NULL, _IONBF, 0);
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if (connectTerminals[i]) {
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/* skip the window id written by xterm */
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while (fgetc(serials[i].in) != '\n') ;
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}
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}
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serialReset();
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}
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void serialExit(void) {
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int i;
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/* kill and wait for all xterm processes */
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for (i = 0; i < nSerials; i++) {
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if (serials[i].pid > 0) {
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kill(serials[i].pid, SIGKILL);
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waitpid(serials[i].pid, NULL, 0);
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}
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}
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}
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