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[/] [eco32/] [tags/] [eco32-0.24/] [sim/] [term.c] - Blame information for rev 211

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1 8 hellwig 
/*
2 
 * term.c -- terminal simulation
3 
 */
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5 
 
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#ifdef __linux__
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#define _XOPEN_SOURCE
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#endif
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10 
#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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21 
#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 "term.h"
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29 
 
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/**************************************************************/
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32 
 
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static Bool debug = false;
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35 
 
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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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} Terminal;
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48 
 
49 
static Terminal terminals[MAX_NTERMS];
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static int numTerminals;
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52 
 
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/**************************************************************/
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55 
 
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static void rcvrCallback(int dev) {
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  int c;
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59 
  if (debug) {
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    cPrintf("\n**** TERM RCVR CALLBACK ****\n");
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  }
62 25 hellwig 
  timerStart(TERM_RCVR_USEC, rcvrCallback, dev);
63 8 hellwig 
  c = fgetc(terminals[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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  terminals[dev].rcvrData = c & 0xFF;
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  terminals[dev].rcvrCtrl |= TERM_RCVR_RDY;
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  if (terminals[dev].rcvrCtrl & TERM_RCVR_IEN) {
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    /* raise terminal rcvr interrupt */
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    cpuSetInterrupt(terminals[dev].rcvrIRQ);
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  }
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}
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77 
 
78 
static void xmtrCallback(int dev) {
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  if (debug) {
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    cPrintf("\n**** TERM XMTR CALLBACK ****\n");
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  }
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  fputc(terminals[dev].xmtrData & 0xFF, terminals[dev].out);
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  terminals[dev].xmtrCtrl |= TERM_XMTR_RDY;
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  if (terminals[dev].xmtrCtrl & TERM_XMTR_IEN) {
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    /* raise terminal xmtr interrupt */
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    cpuSetInterrupt(terminals[dev].xmtrIRQ);
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  }
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}
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90 
 
91 
/**************************************************************/
92 
 
93 
 
94 
Word termRead(Word addr) {
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  int dev, reg;
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  Word data;
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98 
  if (debug) {
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    cPrintf("\n**** TERM READ from 0x%08X", addr);
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  }
101 25 hellwig 
  dev = addr >> 12;
102 8 hellwig 
  if (dev >= numTerminals) {
103 
    /* illegal device */
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    throwException(EXC_BUS_TIMEOUT);
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  }
106 25 hellwig 
  reg = addr & 0x0FFF;
107 8 hellwig 
  if (reg == TERM_RCVR_CTRL) {
108 
    data = terminals[dev].rcvrCtrl;
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  } else
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  if (reg == TERM_RCVR_DATA) {
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    terminals[dev].rcvrCtrl &= ~TERM_RCVR_RDY;
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    if (terminals[dev].rcvrCtrl & TERM_RCVR_IEN) {
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      /* lower terminal rcvr interrupt */
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      cpuResetInterrupt(terminals[dev].rcvrIRQ);
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    }
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    data = terminals[dev].rcvrData;
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  } else
118 
  if (reg == TERM_XMTR_CTRL) {
119 
    data = terminals[dev].xmtrCtrl;
120 
  } else
121 
  if (reg == TERM_XMTR_DATA) {
122 
    /* this register is write-only */
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    throwException(EXC_BUS_TIMEOUT);
124 
  } else {
125 
    /* illegal register */
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    throwException(EXC_BUS_TIMEOUT);
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  }
128 
  if (debug) {
129 
    cPrintf(", data = 0x%08X ****\n", data);
130 
  }
131 
  return data;
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}
133 
 
134 
 
135 
void termWrite(Word addr, Word data) {
136 
  int dev, reg;
137 
 
138 
  if (debug) {
139 
    cPrintf("\n**** TERM WRITE to 0x%08X, data = 0x%08X ****\n",
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            addr, data);
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  }
142 25 hellwig 
  dev = addr >> 12;
143 8 hellwig 
  if (dev >= numTerminals) {
144 
    /* illegal device */
145 
    throwException(EXC_BUS_TIMEOUT);
146 
  }
147 25 hellwig 
  reg = addr & 0x0FFF;
148 8 hellwig 
  if (reg == TERM_RCVR_CTRL) {
149 
    if (data & TERM_RCVR_IEN) {
150 
      terminals[dev].rcvrCtrl |= TERM_RCVR_IEN;
151 
    } else {
152 
      terminals[dev].rcvrCtrl &= ~TERM_RCVR_IEN;
153 
    }
154 
    if (data & TERM_RCVR_RDY) {
155 
      terminals[dev].rcvrCtrl |= TERM_RCVR_RDY;
156 
    } else {
157 
      terminals[dev].rcvrCtrl &= ~TERM_RCVR_RDY;
158 
    }
159 
    if ((terminals[dev].rcvrCtrl & TERM_RCVR_IEN) != 0 &&
160 
        (terminals[dev].rcvrCtrl & TERM_RCVR_RDY) != 0) {
161 
      /* raise terminal rcvr interrupt */
162 
      cpuSetInterrupt(terminals[dev].rcvrIRQ);
163 
    } else {
164 
      /* lower terminal rcvr interrupt */
165 
      cpuResetInterrupt(terminals[dev].rcvrIRQ);
166 
    }
167 
  } else
168 
  if (reg == TERM_RCVR_DATA) {
169 
    /* this register is read-only */
170 
    throwException(EXC_BUS_TIMEOUT);
171 
  } else
172 
  if (reg == TERM_XMTR_CTRL) {
173 
    if (data & TERM_XMTR_IEN) {
174 
      terminals[dev].xmtrCtrl |= TERM_XMTR_IEN;
175 
    } else {
176 
      terminals[dev].xmtrCtrl &= ~TERM_XMTR_IEN;
177 
    }
178 
    if (data & TERM_XMTR_RDY) {
179 
      terminals[dev].xmtrCtrl |= TERM_XMTR_RDY;
180 
    } else {
181 
      terminals[dev].xmtrCtrl &= ~TERM_XMTR_RDY;
182 
    }
183 
    if ((terminals[dev].xmtrCtrl & TERM_XMTR_IEN) != 0 &&
184 
        (terminals[dev].xmtrCtrl & TERM_XMTR_RDY) != 0) {
185 
      /* raise terminal xmtr interrupt */
186 
      cpuSetInterrupt(terminals[dev].xmtrIRQ);
187 
    } else {
188 
      /* lower terminal xmtr interrupt */
189 
      cpuResetInterrupt(terminals[dev].xmtrIRQ);
190 
    }
191 
  } else
192 
  if (reg == TERM_XMTR_DATA) {
193 
    terminals[dev].xmtrData = data & 0xFF;
194 
    terminals[dev].xmtrCtrl &= ~TERM_XMTR_RDY;
195 
    if (terminals[dev].xmtrCtrl & TERM_XMTR_IEN) {
196 
      /* lower terminal xmtr interrupt */
197 
      cpuResetInterrupt(terminals[dev].xmtrIRQ);
198 
    }
199 25 hellwig 
    timerStart(TERM_XMTR_USEC, xmtrCallback, dev);
200 8 hellwig 
  } else {
201 
    /* illegal register */
202 
    throwException(EXC_BUS_TIMEOUT);
203 
  }
204 
}
205 
 
206 
 
207 
/**************************************************************/
208 
 
209 
 
210 
void termReset(void) {
211 
  int i;
212 
 
213 
  cPrintf("Resetting Terminals...\n");
214 
  for (i = 0; i < numTerminals; i++) {
215 
    terminals[i].rcvrCtrl = 0;
216 
    terminals[i].rcvrData = 0;
217 
    terminals[i].rcvrIRQ = IRQ_TERM_0_RCVR + 2 * i;
218 25 hellwig 
    timerStart(TERM_RCVR_USEC, rcvrCallback, i);
219 8 hellwig 
    terminals[i].xmtrCtrl = TERM_XMTR_RDY;
220 
    terminals[i].xmtrData = 0;
221 
    terminals[i].xmtrIRQ = IRQ_TERM_0_XMTR + 2 * i;
222 
  }
223 
}
224 
 
225 
 
226 
static int openPty(int *master, int *slave, char *name) {
227 
  /* try to open master */
228 
  strcpy(name, "/dev/ptmx");
229 
  *master = open(name, O_RDWR | O_NONBLOCK);
230 
  if (*master < 0) {
231 
    /* open failed */
232 
    return -1;
233 
  }
234 
  grantpt(*master);
235 
  unlockpt(*master);
236 
  /* master opened, try to open slave */
237 
  strcpy(name, ptsname(*master));
238 
  *slave = open(name, O_RDWR | O_NONBLOCK);
239 
  if (*slave < 0) {
240 
    /* open failed, close master */
241 
    close(*master);
242 
    return -1;
243 
  }
244 
  /* all is well */
245 
  return 0;
246 
}
247 
 
248 
 
249 
static void makeRaw(struct termios *tp) {
250 
  tp->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
251 
  tp->c_oflag &= ~OPOST;
252 
  tp->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
253 
  tp->c_cflag &= ~(CSIZE|PARENB);
254 
  tp->c_cflag |= CS8;
255 
}
256 
 
257 
 
258 
void termInit(int numTerms) {
259 
  int master, slave;
260 
  char ptyName[100];
261 
  char ptyTitle[100];
262 
  struct termios termios;
263 
  int i;
264 
 
265 
  numTerminals = numTerms;
266 
  for (i = 0; i < numTerminals; i++) {
267 
    /* open pseudo terminal */
268 
    if (openPty(&master, &slave, ptyName) < 0) {
269 
      error("cannot open pseudo terminal %d", i);
270 
    }
271 
    if (debug) {
272 
      cPrintf("pseudo terminal '%s': master fd = %d, slave fd = %d\n",
273 
              ptyName, master, slave);
274 
    }
275 
    /* set mode to raw */
276 
    tcgetattr(slave, &termios);
277 
    makeRaw(&termios);
278 
    tcsetattr(slave, TCSANOW, &termios);
279 
    /* fork and exec a new xterm */
280 
    terminals[i].pid = fork();
281 
    if (terminals[i].pid < 0) {
282 
      error("cannot fork xterm process %d", i);
283 
    }
284 
    if (terminals[i].pid == 0) {
285 
      /* terminal process */
286 
      setpgid(0, 0);
287 
      close(2);
288 
      close(master);
289 
      sprintf(ptyName, "-Sab%d", slave);
290 
      sprintf(ptyTitle, "ECO32 Terminal %d", i);
291 
      execlp("xterm", "xterm", "-title", ptyTitle, ptyName, NULL);
292 
      error("cannot exec xterm process %d", i);
293 
    }
294 
    fcntl(master, F_SETFL, O_NONBLOCK);
295 
    terminals[i].in = fdopen(master, "r");
296 
    setvbuf(terminals[i].in, NULL, _IONBF, 0);
297 
    terminals[i].out = fdopen(master, "w");
298 
    setvbuf(terminals[i].out, NULL, _IONBF, 0);
299 
    /* skip the window id written by xterm */
300 
    while (fgetc(terminals[i].in) != '\n') ;
301 
  }
302 
  termReset();
303 
}
304 
 
305 
 
306 
void termExit(void) {
307 
  int i;
308 
 
309 
  /* kill and wait for all xterm processes */
310 
  for (i = 0; i < numTerminals; i++) {
311 
    if (terminals[i].pid > 0) {
312 
      kill(terminals[i].pid, SIGKILL);
313 
      waitpid(terminals[i].pid, NULL, 0);
314 
    }
315 
  }
316 
}

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