| 1 | /* Remote serial interface for local (hardwired) serial ports for GO32. |
| 2 | Copyright 1992, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "serial.h" |
| 22 | #include <sys/dos.h> |
| 23 | |
| 24 | #define disable() asm("cli") |
| 25 | #define enable() asm("sti") |
| 26 | |
| 27 | |
| 28 | struct go32_ttystate |
| 29 | { |
| 30 | int bogus; |
| 31 | }; |
| 32 | typedef struct |
| 33 | { |
| 34 | short jmp_op; |
| 35 | short signature; |
| 36 | short version; |
| 37 | short buffer_start; |
| 38 | short buffer_end; |
| 39 | short getp; |
| 40 | short putp; |
| 41 | short iov; |
| 42 | short count; |
| 43 | short overflow; |
| 44 | short buffer_size; |
| 45 | short ovflushes; |
| 46 | } |
| 47 | ASYNC_STRUCT; |
| 48 | |
| 49 | #define AOFF_JMP_OP 0 |
| 50 | #define AOFF_SIGNATURE 2 |
| 51 | #define AOFF_VERSION 4 |
| 52 | #define AOFF_BUFFER_START 6 |
| 53 | #define AOFF_BUFFER_END 8 |
| 54 | #define AOFF_GETP 10 |
| 55 | #define AOFF_PUTP 12 |
| 56 | #define AOFF_IOV 14 |
| 57 | #define AOFF_COUNT 16 |
| 58 | #define AOFF_OVERFLOW 18 |
| 59 | #define AOFF_BUFFER_SIZE 20 |
| 60 | #define AOFF_OVFLUSHES 22 |
| 61 | |
| 62 | |
| 63 | static ASYNC_STRUCT a; /* Copy in our mem of the struct */ |
| 64 | static long aindex; /* index into dos space of struct */ |
| 65 | |
| 66 | static int go32_open PARAMS ((serial_t scb, const char *name)); |
| 67 | static void go32_raw PARAMS ((serial_t scb)); |
| 68 | static int go32_readchar PARAMS ((serial_t scb, int timeout)); |
| 69 | static int go32_setbaudrate PARAMS ((serial_t scb, int rate)); |
| 70 | static int go32_write PARAMS ((serial_t scb, const char *str, int len)); |
| 71 | static void go32_close PARAMS ((serial_t scb)); |
| 72 | static serial_ttystate go32_get_tty_state PARAMS ((serial_t scb)); |
| 73 | static int go32_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); |
| 74 | static unsigned char aptr PARAMS ((short p)); |
| 75 | static unsigned long getivec PARAMS ((int which)); |
| 76 | static int dos_async_init PARAMS ((int port)); |
| 77 | static void dos_async_tx PARAMS ((const char c)); |
| 78 | static int dos_async_rx PARAMS (()); |
| 79 | static int dosasync_read PARAMS ((int fd, char *buf, int len, int timeout)); |
| 80 | static int dosasync_write PARAMS ((int fd, const char *buf, int len)); |
| 81 | |
| 82 | #define SIGNATURE 0x4154 |
| 83 | #define VERSION 1 |
| 84 | #define OFFSET 0x104 |
| 85 | |
| 86 | char packet[50]; |
| 87 | int packet_len; |
| 88 | int packet_idx; |
| 89 | |
| 90 | unsigned char bb; |
| 91 | unsigned short sb; |
| 92 | unsigned long sl; |
| 93 | |
| 94 | #define SET_BYTE(x,y) { char _buf = y;dosmemput(&_buf,1, x);} |
| 95 | #define SET_WORD(x,y) { short _buf = y;dosmemput(&_buf,2, x);} |
| 96 | #define GET_BYTE(x) ( dosmemget((x),1,&bb), bb) |
| 97 | |
| 98 | |
| 99 | #define GET_LONG(x) ( dosmemget((x),4,&sl), sl) |
| 100 | |
| 101 | static |
| 102 | unsigned short |
| 103 | GET_WORD (x) |
| 104 | { |
| 105 | unsigned short sb; |
| 106 | dosmemget ((x), 2, &sb); |
| 107 | return sb; |
| 108 | } |
| 109 | |
| 110 | static int iov[2]; |
| 111 | |
| 112 | #define com_rb(n) iov[n] |
| 113 | #define com_tb(n) iov[n] |
| 114 | #define com_ier(n) iov[n]+1 |
| 115 | #define com_ifr(n) iov[n]+2 |
| 116 | #define com_bfr(n) iov[n]+3 |
| 117 | #define com_mcr(n) iov[n]+4 |
| 118 | #define com_lsr(n) iov[n]+5 |
| 119 | #define com_msr(n) iov[n]+6 |
| 120 | |
| 121 | static unsigned char |
| 122 | aptr (p) |
| 123 | short p; |
| 124 | { |
| 125 | return GET_BYTE (aindex - OFFSET + p); |
| 126 | } |
| 127 | |
| 128 | static unsigned long |
| 129 | getivec (int which) |
| 130 | { |
| 131 | long tryaindex; |
| 132 | |
| 133 | if (GET_WORD (which * 4) != OFFSET) |
| 134 | return 0; |
| 135 | |
| 136 | /* Find out where in memory this lives */ |
| 137 | tryaindex = GET_WORD (which * 4 + 2) * 16 + GET_WORD (which * 4); |
| 138 | |
| 139 | if (GET_WORD (tryaindex + 2) != SIGNATURE) |
| 140 | return 0; |
| 141 | if (GET_WORD (tryaindex + 4) != VERSION) |
| 142 | return 0; |
| 143 | return tryaindex; |
| 144 | } |
| 145 | |
| 146 | static int |
| 147 | dos_async_init (port) |
| 148 | int port; |
| 149 | { |
| 150 | switch (port) |
| 151 | { |
| 152 | case 1: |
| 153 | aindex = getivec (12); |
| 154 | break; |
| 155 | case 2: |
| 156 | aindex = getivec (11); |
| 157 | break; |
| 158 | default: |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | if (!aindex) |
| 163 | { |
| 164 | error ("GDB cannot connect to asynctsr program, check that it is installed\n\ |
| 165 | and that serial I/O is not being redirected (perhaps by NFS)\n\n\ |
| 166 | example configuration:\n\ |
| 167 | C> mode com%d:9600,n,8,1,p\n\ |
| 168 | C> asynctsr %d\n\ |
| 169 | C> gdb \n", port, port); |
| 170 | } |
| 171 | |
| 172 | iov[0] = GET_WORD (aindex + AOFF_IOV); |
| 173 | outportb (com_ier (0), 0x0f); |
| 174 | outportb (com_bfr (0), 0x03); |
| 175 | outportb (com_mcr (0), 0x0b); |
| 176 | return 1; |
| 177 | } |
| 178 | |
| 179 | static void |
| 180 | dos_async_tx (c) |
| 181 | const char c; |
| 182 | { |
| 183 | while (~inportb (com_lsr (0)) & 0x20) |
| 184 | ; |
| 185 | outportb (com_tb (0), c); |
| 186 | } |
| 187 | |
| 188 | static int |
| 189 | dos_async_ready () |
| 190 | { |
| 191 | int ret; |
| 192 | |
| 193 | if (packet_idx < packet_len) |
| 194 | return 1; |
| 195 | |
| 196 | disable (); |
| 197 | #if RDY_CNT |
| 198 | ret = GET_WORD (aindex + AOFF_COUNT); |
| 199 | #else |
| 200 | ret = GET_WORD (aindex + AOFF_GETP) != GET_WORD (aindex + AOFF_PUTP); |
| 201 | #endif |
| 202 | enable (); |
| 203 | return ret; |
| 204 | |
| 205 | |
| 206 | } |
| 207 | |
| 208 | static int |
| 209 | dos_async_rx () |
| 210 | { |
| 211 | char rv; |
| 212 | short idx; |
| 213 | |
| 214 | while (1) |
| 215 | { |
| 216 | if (packet_idx < packet_len) |
| 217 | { |
| 218 | char x = packet[packet_idx++]; |
| 219 | return x; |
| 220 | } |
| 221 | while (!dos_async_ready ()) |
| 222 | { |
| 223 | if (kbhit ()) |
| 224 | { |
| 225 | printf_unfiltered ("abort!\n"); |
| 226 | return 0; |
| 227 | } |
| 228 | } |
| 229 | disable (); |
| 230 | { |
| 231 | /* Sometimes we can read more than one char at a time |
| 232 | from the buffer, which is good, cause it'll mean |
| 233 | less time with interrupts turned off, which means |
| 234 | less dropped characters */ |
| 235 | |
| 236 | /* We only do the simplest case here - not bothering with |
| 237 | wrap around */ |
| 238 | int len; |
| 239 | |
| 240 | int getp = GET_WORD (aindex + AOFF_GETP); |
| 241 | int putp = GET_WORD (aindex + AOFF_PUTP); |
| 242 | int endb = GET_WORD (aindex + AOFF_BUFFER_END); |
| 243 | int startb = GET_WORD (aindex + AOFF_BUFFER_START); |
| 244 | |
| 245 | /* We'd like to grab to the end of the the input, |
| 246 | but it may have wrapped, so max is to the end |
| 247 | of the buffer */ |
| 248 | |
| 249 | if (putp > endb || putp < getp) |
| 250 | putp = endb; |
| 251 | |
| 252 | /* Work out the length of the suck */ |
| 253 | len = putp - getp; |
| 254 | |
| 255 | /* But only suck as many as we can hold in one go */ |
| 256 | if (len > sizeof (packet)) |
| 257 | len = sizeof (packet); |
| 258 | |
| 259 | dosmemget (aindex - OFFSET + getp, len, packet); |
| 260 | |
| 261 | packet_len = len; |
| 262 | packet_idx = 0; |
| 263 | |
| 264 | if (getp + len >= endb) |
| 265 | { |
| 266 | getp = startb; |
| 267 | } |
| 268 | else |
| 269 | { |
| 270 | getp = getp + len; |
| 271 | } |
| 272 | |
| 273 | SET_WORD (aindex + AOFF_GETP, getp); |
| 274 | SET_WORD (aindex + AOFF_COUNT, GET_WORD (aindex + AOFF_COUNT) - len); |
| 275 | } |
| 276 | enable (); |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | |
| 281 | static int |
| 282 | dosasync_read (fd, buf, len, timeout) |
| 283 | int fd; |
| 284 | char *buf; |
| 285 | int len; |
| 286 | int timeout; |
| 287 | { |
| 288 | long now, then; |
| 289 | int i; |
| 290 | int its = 0; |
| 291 | time (&now); |
| 292 | then = now + timeout; |
| 293 | |
| 294 | for (i = 0; i < len; i++) |
| 295 | { |
| 296 | if (timeout) |
| 297 | { |
| 298 | while (!dos_async_ready ()) |
| 299 | { |
| 300 | time (&now); |
| 301 | if (now >= then && timeout > 0 && its > 1000) |
| 302 | return i; |
| 303 | its++; |
| 304 | } |
| 305 | } |
| 306 | *buf++ = dos_async_rx (); |
| 307 | } |
| 308 | return len; |
| 309 | } |
| 310 | |
| 311 | static int |
| 312 | dosasync_write (fd, buf, len) |
| 313 | int fd; |
| 314 | const char *buf; |
| 315 | int len; |
| 316 | { |
| 317 | int l; |
| 318 | |
| 319 | for (l = 0; l < len; l++) |
| 320 | dos_async_tx (*buf++); |
| 321 | |
| 322 | return len; |
| 323 | } |
| 324 | |
| 325 | static int |
| 326 | go32_open (scb, name) |
| 327 | serial_t scb; |
| 328 | const char *name; |
| 329 | { |
| 330 | int port; |
| 331 | |
| 332 | if (strncasecmp (name, "com", 3) != 0) |
| 333 | { |
| 334 | errno = ENOENT; |
| 335 | return -1; |
| 336 | } |
| 337 | |
| 338 | port = name[3] - '0'; |
| 339 | |
| 340 | if ((port != 1) && (port != 2)) |
| 341 | { |
| 342 | errno = ENOENT; |
| 343 | return -11; |
| 344 | } |
| 345 | |
| 346 | scb->fd = dos_async_init (port); |
| 347 | if (!scb->fd) |
| 348 | return -1; |
| 349 | |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static int |
| 354 | go32_noop (scb) |
| 355 | serial_t scb; |
| 356 | { |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | static void |
| 361 | go32_raw (scb) |
| 362 | serial_t scb; |
| 363 | { |
| 364 | /* Always in raw mode */ |
| 365 | } |
| 366 | |
| 367 | static int |
| 368 | go32_readchar (scb, timeout) |
| 369 | serial_t scb; |
| 370 | int timeout; |
| 371 | { |
| 372 | char buf; |
| 373 | |
| 374 | /* Shortcut for polling */ |
| 375 | if (timeout == 0) |
| 376 | { |
| 377 | if (dos_async_ready ()) |
| 378 | { |
| 379 | return dos_async_rx (); |
| 380 | } |
| 381 | return SERIAL_TIMEOUT; |
| 382 | } |
| 383 | |
| 384 | if (dosasync_read (scb->fd, &buf, 1, timeout)) |
| 385 | return buf; |
| 386 | else |
| 387 | return SERIAL_TIMEOUT; |
| 388 | } |
| 389 | |
| 390 | /* go32_{get set}_tty_state() are both dummys to fill out the function |
| 391 | vector. Someday, they may do something real... */ |
| 392 | |
| 393 | static serial_ttystate |
| 394 | go32_get_tty_state (scb) |
| 395 | serial_t scb; |
| 396 | { |
| 397 | struct go32_ttystate *state; |
| 398 | |
| 399 | state = (struct go32_ttystate *) xmalloc (sizeof *state); |
| 400 | |
| 401 | return (serial_ttystate) state; |
| 402 | } |
| 403 | |
| 404 | static int |
| 405 | go32_set_tty_state (scb, ttystate) |
| 406 | serial_t scb; |
| 407 | serial_ttystate ttystate; |
| 408 | { |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | static int |
| 413 | go32_noflush_set_tty_state (scb, new_ttystate, old_ttystate) |
| 414 | serial_t scb; |
| 415 | serial_ttystate new_ttystate; |
| 416 | serial_ttystate old_ttystate; |
| 417 | { |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | static void |
| 422 | go32_print_tty_state (scb, ttystate) |
| 423 | serial_t scb; |
| 424 | serial_ttystate ttystate; |
| 425 | { |
| 426 | /* Nothing to print. */ |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | static int |
| 431 | go32_setbaudrate (scb, rate) |
| 432 | serial_t scb; |
| 433 | int rate; |
| 434 | { |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static int |
| 439 | go32_write (scb, str, len) |
| 440 | serial_t scb; |
| 441 | const char *str; |
| 442 | int len; |
| 443 | { |
| 444 | dosasync_write (scb->fd, str, len); |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static void |
| 450 | go32_close (scb) |
| 451 | serial_t scb; |
| 452 | { |
| 453 | } |
| 454 | |
| 455 | static struct serial_ops go32_ops = |
| 456 | { |
| 457 | "hardwire", |
| 458 | 0, |
| 459 | go32_open, |
| 460 | go32_close, |
| 461 | go32_readchar, |
| 462 | go32_write, |
| 463 | go32_noop, /* flush output */ |
| 464 | go32_noop, /* flush input */ |
| 465 | go32_noop, /* send break -- currently used only for nindy */ |
| 466 | go32_raw, |
| 467 | go32_get_tty_state, |
| 468 | go32_set_tty_state, |
| 469 | go32_print_tty_state, |
| 470 | go32_noflush_set_tty_state, |
| 471 | go32_setbaudrate, |
| 472 | }; |
| 473 | |
| 474 | void |
| 475 | _initialize_ser_go32 () |
| 476 | { |
| 477 | serial_add_interface (&go32_ops); |
| 478 | } |