gdb/ser-go32.c

   1 /* Remote serial interface for local (hardwired) serial ports for
   2    GO32.  Copyright 1992, 1993 Free Software Foundation, Inc.
   3
   4    Contributed by Nigel Stephens, Algorithmics Ltd. (nigel@algor.co.uk).
   5
   6    This version uses DPMI interrupts to handle buffered i/o
   7    without the separate "asynctsr" program.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 59 Temple Place - Suite 330,
  24    Boston, MA 02111-1307, USA.  */
  25
  26 #include "defs.h"
  27 #include "gdbcmd.h"
  28 #include "serial.h"
  29
  30
  31 /*
  32  * NS16550 UART registers
  33  */
  34
  35 #define COM1ADDR        0x3f8
  36 #define COM2ADDR        0x2f8
  37 #define COM3ADDR        0x3e8
  38 #define COM4ADDR        0x3e0
  39
  40 #define com_data        0       /* data register (R/W) */
  41 #define com_dlbl        0       /* divisor latch low (W) */
  42 #define com_ier         1       /* interrupt enable (W) */
  43 #define com_dlbh        1       /* divisor latch high (W) */
  44 #define com_iir         2       /* interrupt identification (R) */
  45 #define com_fifo        2       /* FIFO control (W) */
  46 #define com_lctl        3       /* line control register (R/W) */
  47 #define com_cfcr        3       /* line control register (R/W) */
  48 #define com_mcr         4       /* modem control register (R/W) */
  49 #define com_lsr         5       /* line status register (R/W) */
  50 #define com_msr         6       /* modem status register (R/W) */
  51
  52 /*
  53  * Constants for computing 16 bit baud rate divisor (lower byte
  54  * in com_dlbl, upper in com_dlbh) from 1.8432MHz crystal.  Divisor is
  55  * 1.8432 MHz / (16 * X) for X bps.  If the baud rate can't be set
  56  * to within +- (desired_rate*SPEED_TOLERANCE/1000) bps, we fail.
  57  */
  58 #define COMTICK         (1843200/16)
  59 #define SPEED_TOLERANCE 30      /* thousandths; real == desired +- 3.0% */
  60
  61 /* interrupt enable register */
  62 #define IER_ERXRDY      0x1     /* int on rx ready */
  63 #define IER_ETXRDY      0x2     /* int on tx ready */
  64 #define IER_ERLS        0x4     /* int on line status change */
  65 #define IER_EMSC        0x8     /* int on modem status change */
  66
  67 /* interrupt identification register */
  68 #define IIR_FIFO_MASK   0xc0    /* set if FIFOs are enabled */
  69 #define IIR_IMASK       0xf     /* interrupt cause mask */
  70 #define IIR_NOPEND      0x1     /* nothing pending */
  71 #define IIR_RLS         0x6     /* receive line status */
  72 #define IIR_RXRDY       0x4     /* receive ready */
  73 #define IIR_RXTOUT      0xc     /* receive timeout */
  74 #define IIR_TXRDY       0x2     /* transmit ready */
  75 #define IIR_MLSC        0x0     /* modem status */
  76
  77
  78 /* fifo control register */
  79 #define FIFO_ENABLE     0x01    /* enable fifo */
  80 #define FIFO_RCV_RST    0x02    /* reset receive fifo */
  81 #define FIFO_XMT_RST    0x04    /* reset transmit fifo */
  82 #define FIFO_DMA_MODE   0x08    /* enable dma mode */
  83 #define FIFO_TRIGGER_1  0x00    /* trigger at 1 char */
  84 #define FIFO_TRIGGER_4  0x40    /* trigger at 4 chars */
  85 #define FIFO_TRIGGER_8  0x80    /* trigger at 8 chars */
  86 #define FIFO_TRIGGER_14 0xc0    /* trigger at 14 chars */
  87
  88 /* character format control register */
  89 #define CFCR_DLAB       0x80    /* divisor latch */
  90 #define CFCR_SBREAK     0x40    /* send break */
  91 #define CFCR_PZERO      0x30    /* zero parity */
  92 #define CFCR_PONE       0x20    /* one parity */
  93 #define CFCR_PEVEN      0x10    /* even parity */
  94 #define CFCR_PODD       0x00    /* odd parity */
  95 #define CFCR_PENAB      0x08    /* parity enable */
  96 #define CFCR_STOPB      0x04    /* 2 stop bits */
  97 #define CFCR_8BITS      0x03    /* 8 data bits */
  98 #define CFCR_7BITS      0x02    /* 7 data bits */
  99 #define CFCR_6BITS      0x01    /* 6 data bits */
 100 #define CFCR_5BITS      0x00    /* 5 data bits */
 101
 102 /* modem control register */
 103 #define MCR_LOOPBACK    0x10    /* loopback */
 104 #define MCR_IENABLE     0x08    /* output 2 = int enable */
 105 #define MCR_DRS         0x04    /* output 1 = xxx */
 106 #define MCR_RTS         0x02    /* enable RTS */
 107 #define MCR_DTR         0x01    /* enable DTR */
 108
 109 /* line status register */
 110 #define LSR_RCV_FIFO    0x80    /* error in receive fifo */
 111 #define LSR_TSRE        0x40    /* transmitter empty */
 112 #define LSR_TXRDY       0x20    /* transmitter ready */
 113 #define LSR_BI          0x10    /* break detected */
 114 #define LSR_FE          0x08    /* framing error */
 115 #define LSR_PE          0x04    /* parity error */
 116 #define LSR_OE          0x02    /* overrun error */
 117 #define LSR_RXRDY       0x01    /* receiver ready */
 118 #define LSR_RCV_MASK    0x1f
 119
 120 /* modem status register */
 121 #define MSR_DCD         0x80
 122 #define MSR_RI          0x40
 123 #define MSR_DSR         0x20
 124 #define MSR_CTS         0x10
 125 #define MSR_DDCD        0x08
 126 #define MSR_TERI        0x04
 127 #define MSR_DDSR        0x02
 128 #define MSR_DCTS        0x01
 129
 130 #include <dos.h>
 131 #include <go32.h>
 132 #include <dpmi.h>
 133 typedef unsigned long u_long;
 134
 135 /* DPMI Communication */
 136 static union REGS dpmi_regs;
 137 static struct SREGS dpmi_sregs;
 138
 139 /* 16550 rx fifo trigger point */
 140 #define FIFO_TRIGGER    FIFO_TRIGGER_4
 141
 142 /* input buffer size */
 143 #define CBSIZE  4096
 144
 145 /* return raw 18Hz clock count */
 146 extern long rawclock (void);
 147
 148 #define RAWHZ   18
 149
 150 #ifdef DOS_STATS
 151 #define CNT_RX          16
 152 #define CNT_TX          17
 153 #define CNT_STRAY       18
 154 #define CNT_ORUN        19
 155 #define NCNT            20
 156
 157 static int intrcnt;
 158 static int cnts[NCNT];
 159 static char *cntnames[NCNT] =
 160 {
 161   /* h/w interrupt counts. */
 162   "mlsc", "nopend", "txrdy", "?3",
 163   "rxrdy", "?5", "rls", "?7",
 164   "?8", "?9", "?a", "?b",
 165   "rxtout", "?d", "?e", "?f",
 166   /* s/w counts. */
 167   "rxcnt", "txcnt", "stray", "swoflo"
 168 };
 169
 170 #define COUNT(x) cnts[x]++
 171 #else
 172 #define COUNT(x)
 173 #endif
 174
 175 /* Main interrupt controller port addresses. */
 176 #define ICU_BASE        0x20
 177 #define ICU_OCW2        (ICU_BASE + 0)
 178 #define ICU_MASK        (ICU_BASE + 1)
 179
 180 /* Original interrupt controller mask register. */
 181 unsigned char icu_oldmask;
 182
 183 /* Maximum of 8 interrupts (we don't handle the slave icu yet). */
 184 #define NINTR   8
 185
 186 static struct intrupt
 187   {
 188     char inuse;
 189     struct dos_ttystate *port;
 190     _go32_dpmi_seginfo old_rmhandler;
 191     _go32_dpmi_seginfo old_pmhandler;
 192     _go32_dpmi_seginfo new_rmhandler;
 193     _go32_dpmi_seginfo new_pmhandler;
 194     _go32_dpmi_registers regs;
 195   }
 196 intrupts[NINTR];
 197
 198
 199 static struct dos_ttystate
 200   {
 201     int base;
 202     int irq;
 203     int refcnt;
 204     struct intrupt *intrupt;
 205     int fifo;
 206     int baudrate;
 207     unsigned char cbuf[CBSIZE];
 208     unsigned int first;
 209     unsigned int count;
 210     int txbusy;
 211     unsigned char old_mcr;
 212     int ferr;
 213     int perr;
 214     int oflo;
 215     int msr;
 216   }
 217 ports[4] =
 218 {
 219   {
 220     COM1ADDR, 4
 221   }
 222   ,
 223   {
 224     COM2ADDR, 3
 225   }
 226   ,
 227   {
 228     COM3ADDR, 4
 229   }
 230   ,
 231   {
 232     COM4ADDR, 3
 233   }
 234 };
 235
 236 static int dos_open PARAMS ((serial_t scb, const char *name));
 237 static void dos_raw PARAMS ((serial_t scb));
 238 static int dos_readchar PARAMS ((serial_t scb, int timeout));
 239 static int dos_setbaudrate PARAMS ((serial_t scb, int rate));
 240 static int dos_write PARAMS ((serial_t scb, const char *str, int len));
 241 static void dos_close PARAMS ((serial_t scb));
 242 static serial_ttystate dos_get_tty_state PARAMS ((serial_t scb));
 243 static int dos_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
 244 static int dos_baudconv PARAMS ((int rate));
 245
 246 #define inb(p,a)        inportb((p)->base + (a))
 247 #define outb(p,a,v)     outportb((p)->base + (a), (v))
 248 #define disable()       asm volatile ("cli");
 249 #define enable()        asm volatile ("sti");
 250
 251
 252 static int
 253 dos_getc (port)
 254      volatile struct dos_ttystate *port;
 255 {
 256   int c;
 257
 258   if (port->count == 0)
 259     return -1;
 260
 261   c = port->cbuf[port->first];
 262   disable ();
 263   port->first = (port->first + 1) & (CBSIZE - 1);
 264   port->count--;
 265   enable ();
 266   return c;
 267 }
 268
 269
 270 static int
 271 dos_putc (c, port)
 272      int c;
 273      struct dos_ttystate *port;
 274 {
 275   if (port->count >= CBSIZE - 1)
 276     return -1;
 277   port->cbuf[(port->first + port->count) & (CBSIZE - 1)] = c;
 278   port->count++;
 279   return 0;
 280 }
 281 \f
 282
 283
 284 static void
 285 dos_comisr (irq)
 286      int irq;
 287 {
 288   struct dos_ttystate *port;
 289   unsigned char iir, lsr, c;
 290
 291   disable ();                   /* Paranoia */
 292   outportb (ICU_OCW2, 0x20);    /* End-Of-Interrupt */
 293 #ifdef DOS_STATS
 294   ++intrcnt;
 295 #endif
 296
 297   port = intrupts[irq].port;
 298   if (!port)
 299     {
 300       COUNT (CNT_STRAY);
 301       return;                   /* not open */
 302     }
 303
 304   while (1)
 305     {
 306       iir = inb (port, com_iir) & IIR_IMASK;
 307       switch (iir)
 308         {
 309
 310         case IIR_RLS:
 311           lsr = inb (port, com_lsr);
 312           goto rx;
 313
 314         case IIR_RXTOUT:
 315         case IIR_RXRDY:
 316           lsr = 0;
 317
 318         rx:
 319           do
 320             {
 321               c = inb (port, com_data);
 322               if (lsr & (LSR_BI | LSR_FE | LSR_PE | LSR_OE))
 323                 {
 324                   if (lsr & (LSR_BI | LSR_FE))
 325                     port->ferr++;
 326                   else if (lsr & LSR_PE)
 327                     port->perr++;
 328                   if (lsr & LSR_OE)
 329                     port->oflo++;
 330                 }
 331
 332               if (dos_putc (c, port) < 0)
 333                 {
 334                   COUNT (CNT_ORUN);
 335                 }
 336               else
 337                 {
 338                   COUNT (CNT_RX);
 339                 }
 340             }
 341           while ((lsr = inb (port, com_lsr)) & LSR_RXRDY);
 342           break;
 343
 344         case IIR_MLSC:
 345           /* could be used to flowcontrol Tx */
 346           port->msr = inb (port, com_msr);
 347           break;
 348
 349         case IIR_TXRDY:
 350           port->txbusy = 0;
 351           break;
 352
 353         case IIR_NOPEND:
 354           /* no more pending interrupts, all done */
 355           return;
 356
 357         default:
 358           /* unexpected interrupt, ignore */
 359           break;
 360         }
 361       COUNT (iir);
 362     }
 363 }
 364
 365 #ifdef __STDC__
 366 #define ISRNAME(x) dos_comisr##x
 367 #else
 368 #define ISRNAME(x) dos_comisr/**/x
 369 #endif
 370 #define ISR(x) static void ISRNAME(x)() {dos_comisr(x);}
 371
 372 ISR (0) ISR (1) ISR (2) ISR (3)
 373 ISR (4) ISR (5) ISR (6) ISR (7)
 374
 375      typedef void (*isr_t) ();
 376
 377      static isr_t isrs[NINTR] =
 378      {
 379        ISRNAME (0), ISRNAME (1), ISRNAME (2), ISRNAME (3),
 380        ISRNAME (4), ISRNAME (5), ISRNAME (6), ISRNAME (7)
 381 };
 382 \f
 383
 384
 385      static struct intrupt *
 386        dos_hookirq (irq)
 387      unsigned int irq;
 388 {
 389   struct intrupt *intr;
 390   unsigned int vec;
 391   isr_t isr;
 392
 393   if (irq >= NINTR)
 394     return 0;
 395
 396   intr = &intrupts[irq];
 397   if (intr->inuse)
 398     return 0;
 399
 400   vec = 0x08 + irq;
 401   isr = isrs[irq];
 402
 403   /* setup real mode handler */
 404   _go32_dpmi_get_real_mode_interrupt_vector (vec, &intr->old_rmhandler);
 405
 406   intr->new_rmhandler.pm_selector = _go32_my_cs ();
 407   intr->new_rmhandler.pm_offset = (u_long) isr;
 408   if (_go32_dpmi_allocate_real_mode_callback_iret (&intr->new_rmhandler,
 409                                                    &intr->regs))
 410     {
 411       return 0;
 412     }
 413
 414   if (_go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->new_rmhandler))
 415     {
 416       return 0;
 417     }
 418
 419   /* setup protected mode handler */
 420   _go32_dpmi_get_protected_mode_interrupt_vector (vec, &intr->old_pmhandler);
 421
 422   intr->new_pmhandler.pm_selector = _go32_my_cs ();
 423   intr->new_pmhandler.pm_offset = (u_long) isr;
 424   _go32_dpmi_allocate_iret_wrapper (&intr->new_pmhandler);
 425
 426   if (_go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->new_pmhandler))
 427     {
 428       return 0;
 429     }
 430
 431   /* setup interrupt controller mask */
 432   disable ();
 433   outportb (ICU_MASK, inportb (ICU_MASK) & ~(1 << irq));
 434   enable ();
 435
 436   intr->inuse = 1;
 437   return intr;
 438 }
 439
 440
 441 static void
 442 dos_unhookirq (intr)
 443      struct intrupt *intr;
 444 {
 445   unsigned int irq, vec;
 446   unsigned char mask;
 447
 448   irq = intr - intrupts;
 449   vec = 0x08 + irq;
 450
 451   /* restore old interrupt mask bit */
 452   mask = 1 << irq;
 453   disable ();
 454   outportb (ICU_MASK, inportb (ICU_MASK) | (mask & icu_oldmask));
 455   enable ();
 456
 457   /* remove real mode handler */
 458   _go32_dpmi_set_real_mode_interrupt_vector (vec, &intr->old_rmhandler);
 459   _go32_dpmi_free_real_mode_callback (&intr->new_rmhandler);
 460
 461   /* remove protected mode handler */
 462   _go32_dpmi_set_protected_mode_interrupt_vector (vec, &intr->old_pmhandler);
 463   _go32_dpmi_free_iret_wrapper (&intr->new_pmhandler);
 464   intr->inuse = 0;
 465 }
 466 \f
 467
 468
 469 static int
 470 dos_open (scb, name)
 471      serial_t scb;
 472      const char *name;
 473 {
 474   struct dos_ttystate *port;
 475   int fd, i;
 476
 477   if (strncasecmp (name, "/dev/", 5) == 0)
 478     name += 5;
 479   else if (strncasecmp (name, "\\dev\\", 5) == 0)
 480     name += 5;
 481
 482   if (strlen (name) != 4 || strncasecmp (name, "com", 3) != 0)
 483     {
 484       errno = ENOENT;
 485       return -1;
 486     }
 487
 488   if (name[3] < '1' || name[3] > '4')
 489     {
 490       errno = ENOENT;
 491       return -1;
 492     }
 493
 494   fd = name[3] - '1';
 495   port = &ports[fd];
 496   if (port->refcnt++ > 0)
 497     {
 498       /* Device already opened another user.  Just point at it. */
 499       scb->fd = fd;
 500       return 0;
 501     }
 502
 503   /* force access to ID reg */
 504   outb (port, com_cfcr, 0);
 505   outb (port, com_iir, 0);
 506   for (i = 0; i < 17; i++)
 507     {
 508       if ((inb (port, com_iir) & 0x38) == 0)
 509         goto ok;
 510       (void) inb (port, com_data);      /* clear recv */
 511     }
 512   errno = ENODEV;
 513   return -1;
 514
 515 ok:
 516   /* disable all interrupts in chip */
 517   outb (port, com_ier, 0);
 518
 519   /* tentatively enable 16550 fifo, and see if it responds */
 520   outb (port, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER);
 521   sleep (1);
 522   port->fifo = ((inb (port, com_iir) & IIR_FIFO_MASK) == IIR_FIFO_MASK);
 523
 524   /* clear pending status reports. */
 525   (void) inb (port, com_lsr);
 526   (void) inb (port, com_msr);
 527
 528   /* enable external interrupt gate (to avoid floating IRQ) */
 529   outb (port, com_mcr, MCR_IENABLE);
 530
 531   /* hook up interrupt handler and initialise icu */
 532   port->intrupt = dos_hookirq (port->irq);
 533   if (!port->intrupt)
 534     {
 535       outb (port, com_mcr, 0);
 536       outb (port, com_fifo, 0);
 537       errno = ENODEV;
 538       return -1;
 539     }
 540
 541   disable ();
 542
 543   /* record port */
 544   port->intrupt->port = port;
 545   scb->fd = fd;
 546
 547   /* clear rx buffer, tx busy flag and overflow count */
 548   port->first = port->count = 0;
 549   port->txbusy = 0;
 550   port->oflo = 0;
 551
 552   /* set default baud rate and mode: 9600,8,n,1 */
 553   i = dos_baudconv (port->baudrate = 9600);
 554   outb (port, com_cfcr, CFCR_DLAB);
 555   outb (port, com_dlbl, i & 0xff);
 556   outb (port, com_dlbh, i >> 8);
 557   outb (port, com_cfcr, CFCR_8BITS);
 558
 559   /* enable all interrupts */
 560   outb (port, com_ier, IER_ETXRDY | IER_ERXRDY | IER_ERLS | IER_EMSC);
 561
 562   /* enable DTR & RTS */
 563   outb (port, com_mcr, MCR_DTR | MCR_RTS | MCR_IENABLE);
 564
 565   enable ();
 566
 567   return 0;
 568 }
 569
 570
 571 static void
 572 dos_close (scb)
 573      serial_t scb;
 574 {
 575   struct dos_ttystate *port;
 576   struct intrupt *intrupt;
 577
 578   if (!scb)
 579     return;
 580
 581   port = &ports[scb->fd];
 582
 583   if (port->refcnt-- > 1)
 584     return;
 585
 586   if (!(intrupt = port->intrupt))
 587     return;
 588
 589   /* disable interrupts, fifo, flow control */
 590   disable ();
 591   port->intrupt = 0;
 592   intrupt->port = 0;
 593   outb (port, com_fifo, 0);
 594   outb (port, com_ier, 0);
 595   enable ();
 596
 597   /* unhook handler, and disable interrupt gate */
 598   dos_unhookirq (intrupt);
 599   outb (port, com_mcr, 0);
 600
 601   /* Check for overflow errors */
 602   if (port->oflo)
 603     {
 604       fprintf_unfiltered (gdb_stderr,
 605                           "Serial input overruns occurred.\n");
 606       fprintf_unfiltered (gdb_stderr, "This system %s handle %d baud.\n",
 607                           port->fifo ? "cannot" : "needs a 16550 to",
 608                           port->baudrate);
 609     }
 610 }
 611 \f
 612
 613
 614 static int
 615 dos_noop (scb)
 616      serial_t scb;
 617 {
 618   return 0;
 619 }
 620
 621 static void
 622 dos_raw (scb)
 623      serial_t scb;
 624 {
 625   /* Always in raw mode */
 626 }
 627
 628 static int
 629 dos_readchar (scb, timeout)
 630      serial_t scb;
 631      int timeout;
 632 {
 633   struct dos_ttystate *port = &ports[scb->fd];
 634   long then;
 635   int c;
 636
 637   then = rawclock () + (timeout * RAWHZ);
 638   while ((c = dos_getc (port)) < 0)
 639     {
 640       if (timeout >= 0 && (rawclock () - then) >= 0)
 641         return SERIAL_TIMEOUT;
 642       notice_quit ();
 643     }
 644
 645   return c;
 646 }
 647
 648
 649 static serial_ttystate
 650 dos_get_tty_state (scb)
 651      serial_t scb;
 652 {
 653   struct dos_ttystate *port = &ports[scb->fd];
 654   struct dos_ttystate *state;
 655
 656   state = (struct dos_ttystate *) xmalloc (sizeof *state);
 657   *state = *port;
 658   return (serial_ttystate) state;
 659 }
 660
 661 static int
 662 dos_set_tty_state (scb, ttystate)
 663      serial_t scb;
 664      serial_ttystate ttystate;
 665 {
 666   struct dos_ttystate *state;
 667
 668   state = (struct dos_ttystate *) ttystate;
 669   dos_setbaudrate (scb, state->baudrate);
 670   return 0;
 671 }
 672
 673 static int
 674 dos_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
 675      serial_t scb;
 676      serial_ttystate new_ttystate;
 677      serial_ttystate old_ttystate;
 678 {
 679   struct dos_ttystate *state;
 680
 681   state = (struct dos_ttystate *) new_ttystate;
 682   dos_setbaudrate (scb, state->baudrate);
 683   return 0;
 684 }
 685
 686 static int
 687 dos_flush_input (scb)
 688      serial_t scb;
 689 {
 690   struct dos_ttystate *port = &ports[scb->fd];
 691   disable ();
 692   port->first = port->count = 0;
 693   if (port->fifo)
 694     outb (port, com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_TRIGGER);
 695   enable ();
 696 }
 697
 698 static void
 699 dos_print_tty_state (scb, ttystate)
 700      serial_t scb;
 701      serial_ttystate ttystate;
 702 {
 703   /* Nothing to print */
 704   return;
 705 }
 706
 707 static int
 708 dos_baudconv (rate)
 709      int rate;
 710 {
 711   long x, err;
 712
 713   if (rate <= 0)
 714     return -1;
 715
 716 #define divrnd(n, q)    (((n) * 2 / (q) + 1) / 2)       /* divide and round off */
 717   x = divrnd (COMTICK, rate);
 718   if (x <= 0)
 719     return -1;
 720
 721   err = divrnd (1000 * COMTICK, x * rate) - 1000;
 722   if (err < 0)
 723     err = -err;
 724   if (err > SPEED_TOLERANCE)
 725     return -1;
 726 #undef divrnd
 727   return x;
 728 }
 729
 730
 731 static int
 732 dos_setbaudrate (scb, rate)
 733      serial_t scb;
 734      int rate;
 735 {
 736   struct dos_ttystate *port = &ports[scb->fd];
 737
 738   if (port->baudrate != rate)
 739     {
 740       int x;
 741       unsigned char cfcr;
 742
 743       x = dos_baudconv (rate);
 744       if (x <= 0)
 745         {
 746           fprintf_unfiltered (gdb_stderr, "%d: impossible baudrate\n", rate);
 747           errno = EINVAL;
 748           return -1;
 749         }
 750
 751       disable ();
 752       cfcr = inb (port, com_cfcr);
 753
 754       outb (port, com_cfcr, CFCR_DLAB);
 755       outb (port, com_dlbl, x & 0xff);
 756       outb (port, com_dlbh, x >> 8);
 757       outb (port, com_cfcr, cfcr);
 758       port->baudrate = rate;
 759       enable ();
 760     }
 761
 762   return 0;
 763 }
 764
 765 static int
 766 dos_setstopbits (scb, num)
 767      serial_t scb;
 768      int num;
 769 {
 770   struct dos_ttystate *port = &ports[scb->fd];
 771   unsigned char cfcr;
 772
 773   disable ();
 774   cfcr = inb (port, com_cfcr);
 775
 776   switch (num)
 777     {
 778     case SERIAL_1_STOPBITS:
 779       outb (port, com_cfcr, cfcr & ~CFCR_STOPB);
 780       break;
 781     case SERIAL_1_AND_A_HALF_STOPBITS:
 782     case SERIAL_2_STOPBITS:
 783       outb (port, com_cfcr, cfcr | CFCR_STOPB);
 784       break;
 785     default:
 786       enable ();
 787       return 1;
 788     }
 789   enable ();
 790
 791   return 0;
 792 }
 793
 794 static int
 795 dos_write (scb, str, len)
 796      serial_t scb;
 797      const char *str;
 798      int len;
 799 {
 800   volatile struct dos_ttystate *port = &ports[scb->fd];
 801   int fifosize = port->fifo ? 16 : 1;
 802   long then;
 803   int cnt;
 804
 805   while (len > 0)
 806     {
 807       /* send the data, fifosize bytes at a time */
 808       cnt = fifosize > len ? len : fifosize;
 809       port->txbusy = 1;
 810       outportsb (port->base + com_data, str, cnt);
 811       str += cnt;
 812       len -= cnt;
 813 #ifdef DOS_STATS
 814       cnts[CNT_TX] += cnt;
 815 #endif
 816       /* wait for transmission to complete (max 1 sec) */
 817       then = rawclock () + RAWHZ;
 818       while (port->txbusy)
 819         {
 820           if ((rawclock () - then) >= 0)
 821             {
 822               errno = EIO;
 823               return SERIAL_ERROR;
 824             }
 825         }
 826     }
 827   return 0;
 828 }
 829
 830
 831 static int
 832 dos_sendbreak (scb)
 833      serial_t scb;
 834 {
 835   volatile struct dos_ttystate *port = &ports[scb->fd];
 836   unsigned char cfcr;
 837   long then;
 838
 839   cfcr = inb (port, com_cfcr);
 840   outb (port, com_cfcr, cfcr | CFCR_SBREAK);
 841
 842   /* 0.25 sec delay */
 843   then = rawclock () + RAWHZ / 4;
 844   while ((rawclock () - then) < 0)
 845     continue;
 846
 847   outb (port, com_cfcr, cfcr);
 848   return 0;
 849 }
 850
 851
 852 static struct serial_ops dos_ops =
 853 {
 854   "hardwire",
 855   0,
 856   dos_open,
 857   dos_close,
 858   dos_readchar,
 859   dos_write,
 860   dos_noop,                     /* flush output */
 861   dos_flush_input,
 862   dos_sendbreak,
 863   dos_raw,
 864   dos_get_tty_state,
 865   dos_set_tty_state,
 866   dos_print_tty_state,
 867   dos_noflush_set_tty_state,
 868   dos_setbaudrate,
 869   dos_setstopbits,
 870   dos_noop,                     /* wait for output to drain */
 871 };
 872
 873
 874 static void
 875 dos_info (arg, from_tty)
 876      char *arg;
 877      int from_tty;
 878 {
 879   struct dos_ttystate *port;
 880   int i;
 881
 882   for (port = ports; port < &ports[4]; port++)
 883     {
 884       if (port->baudrate == 0)
 885         continue;
 886       printf_filtered ("Port:\tCOM%d (%sactive)\n", port - ports + 1,
 887                        port->intrupt ? "" : "not ");
 888       printf_filtered ("Addr:\t0x%03x (irq %d)\n", port->base, port->irq);
 889       printf_filtered ("16550:\t%s\n", port->fifo ? "yes" : "no");
 890       printf_filtered ("Speed:\t%d baud\n", port->baudrate);
 891       printf_filtered ("Errs:\tframing %d parity %d overflow %d\n\n",
 892                        port->ferr, port->perr, port->oflo);
 893     }
 894
 895 #ifdef DOS_STATS
 896   printf_filtered ("\nTotal interrupts: %d\n", intrcnt);
 897   for (i = 0; i < NCNT; i++)
 898     if (cnts[i])
 899       printf_filtered ("%s:\t%d\n", cntnames[i], cnts[i]);
 900 #endif
 901 }
 902
 903
 904 void
 905 _initialize_ser_dos ()
 906 {
 907   struct cmd_list_element *c;
 908
 909   serial_add_interface (&dos_ops);
 910
 911   /* Save original interrupt mask register. */
 912   icu_oldmask = inportb (ICU_MASK);
 913
 914   /* Mark fixed motherboard irqs as inuse. */
 915   intrupts[0].inuse =           /* timer tick */
 916     intrupts[1].inuse =         /* keyboard */
 917     intrupts[2].inuse = 1;      /* slave icu */
 918
 919   add_show_from_set (
 920                       add_set_cmd ("com1base", class_obscure, var_zinteger,
 921                                    (char *) &ports[0].base,
 922                                    "Set COM1 base i/o port address.",
 923                                    &setlist),
 924                       &showlist);
 925
 926   add_show_from_set (
 927                       add_set_cmd ("com1irq", class_obscure, var_zinteger,
 928                                    (char *) &ports[0].irq,
 929                                    "Set COM1 interrupt request.",
 930                                    &setlist),
 931                       &showlist);
 932
 933   add_show_from_set (
 934                       add_set_cmd ("com2base", class_obscure, var_zinteger,
 935                                    (char *) &ports[1].base,
 936                                    "Set COM2 base i/o port address.",
 937                                    &setlist),
 938                       &showlist);
 939
 940   add_show_from_set (
 941                       add_set_cmd ("com2irq", class_obscure, var_zinteger,
 942                                    (char *) &ports[1].irq,
 943                                    "Set COM2 interrupt request.",
 944                                    &setlist),
 945                       &showlist);
 946
 947   add_show_from_set (
 948                       add_set_cmd ("com3base", class_obscure, var_zinteger,
 949                                    (char *) &ports[2].base,
 950                                    "Set COM3 base i/o port address.",
 951                                    &setlist),
 952                       &showlist);
 953
 954   add_show_from_set (
 955                       add_set_cmd ("com3irq", class_obscure, var_zinteger,
 956                                    (char *) &ports[2].irq,
 957                                    "Set COM3 interrupt request.",
 958                                    &setlist),
 959                       &showlist);
 960
 961   add_show_from_set (
 962                       add_set_cmd ("com4base", class_obscure, var_zinteger,
 963                                    (char *) &ports[3].base,
 964                                    "Set COM4 base i/o port address.",
 965                                    &setlist),
 966                       &showlist);
 967
 968   add_show_from_set (
 969                       add_set_cmd ("com4irq", class_obscure, var_zinteger,
 970                                    (char *) &ports[3].irq,
 971                                    "Set COM4 interrupt request.",
 972                                    &setlist),
 973                       &showlist);
 974
 975   add_info ("serial", dos_info,
 976             "Print DOS serial port status.");
 977 }