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