msdos/ioports.c

   1 /*
   2  * Emulation of processor ioports.
   3  *
   4  * Copyright 1995 Morten Welinder
   5  * Copyright 1998 Andreas Mohr, Ove Kaaven
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* Known problems:
  23    - only a few ports are emulated.
  24    - real-time clock in "cmos" is bogus.  A nifty alarm() setup could
  25      fix that, I guess.
  26 */
  27
  28 #include "config.h"
  29
  30 #include <ctype.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36 #include "windef.h"
  37 #include "callback.h"
  38 #include "file.h"
  39 #include "miscemu.h"
  40 #include "wine/debug.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(int);
  43
  44 static struct {
  45     WORD        countmax;
  46     BOOL16      byte_toggle; /* if TRUE, then hi byte has already been written */
  47     WORD        latch;
  48     BOOL16      latched;
  49     BYTE        ctrlbyte_ch;
  50     WORD        oldval;
  51 } tmr_8253[3] = {
  52     {0xFFFF,    FALSE,  0,      FALSE,  0x36,   0},
  53     {0x0012,    FALSE,  0,      FALSE,  0x74,   0},
  54     {0x0001,    FALSE,  0,      FALSE,  0xB6,   0},
  55 };
  56
  57 static int dummy_ctr = 0;
  58
  59 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  60
  61 static BYTE cmosaddress;
  62
  63 static BYTE cmosimage[64] =
  64 {
  65   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  66   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  67   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  68   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  69   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  70   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
  71   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  72   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  73 };
  74
  75 #if defined(linux) && defined(__i386__)
  76 # define DIRECT_IO_ACCESS
  77 #else
  78 # undef DIRECT_IO_ACCESS
  79 # undef PP_IO_ACCESS
  80 #endif  /* linux && __i386__ */
  81
  82 #ifdef HAVE_PPDEV
  83 static int do_pp_port_access = -1; /* -1: uninitialized, 1: not available
  84                                        0: available);*/
  85 #endif
  86
  87 #ifdef DIRECT_IO_ACCESS
  88
  89 extern int iopl(int level);
  90 static char do_direct_port_access = -1;
  91 static char port_permissions[0x10000];
  92
  93 #define IO_READ  1
  94 #define IO_WRITE 2
  95
  96 static void IO_FixCMOSCheckSum(void)
  97 {
  98         WORD sum = 0;
  99         int i;
 100
 101         for (i=0x10; i < 0x2d; i++)
 102                 sum += cmosimage[i];
 103         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
 104         cmosimage[0x2f] = sum & 0xff;
 105         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
 106 }
 107
 108 #endif  /* DIRECT_IO_ACCESS */
 109
 110 static void set_timer_maxval(unsigned timer, unsigned maxval)
 111 {
 112     switch (timer) {
 113         case 0: /* System timer counter divisor */
 114             if (Dosvm.SetTimer) Dosvm.SetTimer(maxval);
 115             break;
 116         case 1: /* RAM refresh */
 117             FIXME("RAM refresh counter handling not implemented !\n");
 118             break;
 119         case 2: /* cassette & speaker */
 120             /* speaker on ? */
 121             if (((BYTE)parport_8255[1] & 3) == 3)
 122             {
 123                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
 124                 Beep(1193180 / maxval, 20);
 125             }
 126             break;
 127     }
 128 }
 129
 130 /**********************************************************************
 131  *          IO_port_init
 132  */
 133
 134 /* set_IO_permissions(int val1, int val)
 135  * Helper function for IO_port_init
 136  */
 137 #ifdef DIRECT_IO_ACCESS
 138 static void set_IO_permissions(int val1, int val, char rw)
 139 {
 140         int j;
 141         if (val1 != -1) {
 142                 if (val == -1) val = 0x3ff;
 143                 for (j = val1; j <= val; j++)
 144                         port_permissions[j] |= rw;
 145
 146                 do_direct_port_access = 1;
 147
 148                 val1 = -1;
 149         } else if (val != -1) {
 150                 do_direct_port_access = 1;
 151
 152                 port_permissions[val] |= rw;
 153         }
 154
 155 }
 156
 157 /* do_IO_port_init_read_or_write(char* temp, char rw)
 158  * Helper function for IO_port_init
 159  */
 160
 161 static void do_IO_port_init_read_or_write(char* temp, char rw)
 162 {
 163         int val, val1, i, len;
 164         if (!strcasecmp(temp, "all")) {
 165                 MESSAGE("Warning!!! Granting FULL IO port access to"
 166                         " windoze programs!\nWarning!!! "
 167                         "*** THIS IS NOT AT ALL "
 168                         "RECOMMENDED!!! ***\n");
 169                 for (i=0; i < sizeof(port_permissions); i++)
 170                         port_permissions[i] |= rw;
 171
 172         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 173                 len = strlen(temp);
 174                 val = -1;
 175                 val1 = -1;
 176                 for (i = 0; i < len; i++) {
 177                         switch (temp[i]) {
 178                         case '0':
 179                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 180                                         sscanf(temp+i, "%x", &val);
 181                                         i += 2;
 182                                 } else {
 183                                         sscanf(temp+i, "%d", &val);
 184                                 }
 185                                 while (isxdigit(temp[i]))
 186                                         i++;
 187                                 i--;
 188                                 break;
 189                         case ',':
 190                         case ' ':
 191                         case '\t':
 192                                 set_IO_permissions(val1, val, rw);
 193                                 val1 = -1; val = -1;
 194                                 break;
 195                         case '-':
 196                                 val1 = val;
 197                                 if (val1 == -1) val1 = 0;
 198                                 break;
 199                         default:
 200                                 if (temp[i] >= '0' && temp[i] <= '9') {
 201                                         sscanf(temp+i, "%d", &val);
 202                                         while (isdigit(temp[i]))
 203                                                 i++;
 204                                 }
 205                         }
 206                 }
 207                 set_IO_permissions(val1, val, rw);
 208         }
 209 }
 210
 211 static inline BYTE inb( WORD port )
 212 {
 213     BYTE b;
 214     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 215     return b;
 216 }
 217
 218 static inline WORD inw( WORD port )
 219 {
 220     WORD w;
 221     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 222     return w;
 223 }
 224
 225 static inline DWORD inl( WORD port )
 226 {
 227     DWORD dw;
 228     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 229     return dw;
 230 }
 231
 232 static inline void outb( BYTE value, WORD port )
 233 {
 234     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 235 }
 236
 237 static inline void outw( WORD value, WORD port )
 238 {
 239     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 240 }
 241
 242 static inline void outl( DWORD value, WORD port )
 243 {
 244     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 245 }
 246
 247 static void IO_port_init(void)
 248 {
 249         char temp[1024];
 250
 251         do_direct_port_access = 0;
 252         /* Can we do that? */
 253         if (!iopl(3)) {
 254                 iopl(0);
 255
 256                 PROFILE_GetWineIniString( "ports", "read", "*",
 257                                          temp, sizeof(temp) );
 258                 do_IO_port_init_read_or_write(temp, IO_READ);
 259                 PROFILE_GetWineIniString( "ports", "write", "*",
 260                                          temp, sizeof(temp) );
 261                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 262         }
 263     IO_FixCMOSCheckSum();
 264 }
 265
 266 #endif  /* DIRECT_IO_ACCESS */
 267
 268 /**********************************************************************
 269  *          IO_inport
 270  *
 271  * Note: The size argument has to be handled correctly _externally_
 272  * (as we always return a DWORD)
 273  */
 274 DWORD IO_inport( int port, int size )
 275 {
 276     DWORD res = 0;
 277
 278     TRACE("%d-byte value from port 0x%02x\n", size, port );
 279
 280 #ifdef HAVE_PPDEV
 281     if (do_pp_port_access == -1)
 282       do_pp_port_access =IO_pp_init();
 283     if ((do_pp_port_access == 0 ) && (size == 1))
 284       if (!IO_pp_inp(port,&res))
 285          return res;
 286 #endif
 287 #ifdef DIRECT_IO_ACCESS
 288     if (do_direct_port_access == -1) IO_port_init();
 289     if ((do_direct_port_access)
 290         /* Make sure we have access to the port */
 291         && (port_permissions[port] & IO_READ))
 292     {
 293         iopl(3);
 294         switch(size)
 295         {
 296         case 1: res = inb( port ); break;
 297         case 2: res = inw( port ); break;
 298         case 4: res = inl( port ); break;
 299         default:
 300             ERR("invalid data size %d\n", size);
 301         }
 302         iopl(0);
 303         return res;
 304     }
 305 #endif
 306
 307     /* first give the DOS VM a chance to handle it */
 308     if (Dosvm.inport && Dosvm.inport( port, size, &res )) return res;
 309
 310     switch (port)
 311     {
 312     case 0x40:
 313     case 0x41:
 314     case 0x42:
 315     {
 316         BYTE chan = port & 3;
 317         WORD tempval = 0;
 318         if (tmr_8253[chan].latched)
 319             tempval = tmr_8253[chan].latch;
 320         else
 321         {
 322             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 323             if (chan == 0) /* System timer counter divisor */
 324             {
 325                 /* FIXME: Dosvm.GetTimer() returns quite rigid values */
 326                 if (Dosvm.GetTimer)
 327                   tempval = dummy_ctr + (WORD)Dosvm.GetTimer();
 328                 else
 329                   tempval = dummy_ctr;
 330             }
 331             else
 332             {
 333                 /* FIXME: intelligent hardware timer emulation needed */
 334                 tempval = dummy_ctr;
 335             }
 336         }
 337
 338         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 339         {
 340         case 0:
 341             res = 0; /* shouldn't happen? */
 342             break;
 343         case 1: /* read lo byte */
 344             res = (BYTE)tempval;
 345             tmr_8253[chan].latched = FALSE;
 346             break;
 347         case 3: /* read lo byte, then hi byte */
 348             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 349             if (tmr_8253[chan].byte_toggle)
 350             {
 351                 res = (BYTE)tempval;
 352                 break;
 353             }
 354             /* else [fall through if read hi byte !] */
 355         case 2: /* read hi byte */
 356             res = (BYTE)(tempval >> 8);
 357             tmr_8253[chan].latched = FALSE;
 358             break;
 359         }
 360     }
 361     break;
 362     case 0x60:
 363 #if 0 /* what's this port got to do with parport ? */
 364         res = (DWORD)parport_8255[0];
 365 #endif
 366         break;
 367     case 0x61:
 368         res = (DWORD)parport_8255[1];
 369         break;
 370     case 0x62:
 371         res = (DWORD)parport_8255[2];
 372         break;
 373     case 0x70:
 374         res = (DWORD)cmosaddress;
 375         break;
 376     case 0x71:
 377         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 378         break;
 379     case 0x200:
 380     case 0x201:
 381         res = 0xffffffff; /* no joystick */
 382         break;
 383     default:
 384         WARN("Direct I/O read attempted from port %x\n", port);
 385         res = 0xffffffff;
 386         break;
 387     }
 388     TRACE("  returning ( 0x%lx )\n", res );
 389     return res;
 390 }
 391
 392
 393 /**********************************************************************
 394  *          IO_outport
 395  */
 396 void IO_outport( int port, int size, DWORD value )
 397 {
 398     TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 399                  value, size, port );
 400
 401 #ifdef HAVE_PPDEV
 402     if (do_pp_port_access == -1)
 403       do_pp_port_access = IO_pp_init();
 404     if ((do_pp_port_access == 0) && (size == 1))
 405       if (!IO_pp_outp(port,&value))
 406          return;
 407 #endif
 408 #ifdef DIRECT_IO_ACCESS
 409
 410     if (do_direct_port_access == -1) IO_port_init();
 411     if ((do_direct_port_access)
 412         /* Make sure we have access to the port */
 413         && (port_permissions[port] & IO_WRITE))
 414     {
 415         iopl(3);
 416         switch(size)
 417         {
 418         case 1: outb( LOBYTE(value), port ); break;
 419         case 2: outw( LOWORD(value), port ); break;
 420         case 4: outl( value, port ); break;
 421         default:
 422             WARN("Invalid data size %d\n", size);
 423         }
 424         iopl(0);
 425         return;
 426     }
 427 #endif
 428
 429     /* first give the DOS VM a chance to handle it */
 430     if (Dosvm.outport && Dosvm.outport( port, size, value )) return;
 431
 432     switch (port)
 433     {
 434     case 0x40:
 435     case 0x41:
 436     case 0x42:
 437     {
 438         BYTE chan = port & 3;
 439
 440         /* we need to get the oldval before any lo/hi byte change has been made */
 441         if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 442             !tmr_8253[chan].byte_toggle)
 443             tmr_8253[chan].oldval = tmr_8253[chan].countmax;
 444         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 445         {
 446         case 0:
 447             break; /* shouldn't happen? */
 448         case 1: /* write lo byte */
 449             tmr_8253[chan].countmax =
 450                 (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 451             break;
 452         case 3: /* write lo byte, then hi byte */
 453             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 454             if (tmr_8253[chan].byte_toggle)
 455             {
 456                 tmr_8253[chan].countmax =
 457                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 458                 break;
 459             }
 460             /* else [fall through if write hi byte !] */
 461         case 2: /* write hi byte */
 462             tmr_8253[chan].countmax =
 463                 (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 464             break;
 465         }
 466         /* if programming is finished and value has changed
 467            then update to new value */
 468         if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 469              !tmr_8253[chan].byte_toggle) &&
 470             (tmr_8253[chan].countmax != tmr_8253[chan].oldval))
 471             set_timer_maxval(chan, tmr_8253[chan].countmax);
 472     }
 473     break;
 474     case 0x43:
 475     {
 476         BYTE chan = ((BYTE)value & 0xc0) >> 6;
 477         /* ctrl byte for specific timer channel */
 478         if (chan == 3)
 479         {
 480             FIXME("8254 timer readback not implemented yet\n");
 481             break;
 482         }
 483         switch (((BYTE)value & 0x30) >> 4)
 484         {
 485         case 0: /* latch timer */
 486             tmr_8253[chan].latched = TRUE;
 487             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 488             if (chan == 0) /* System timer divisor */
 489                 if (Dosvm.GetTimer)
 490                   tmr_8253[chan].latch = dummy_ctr + (WORD)Dosvm.GetTimer();
 491                 else
 492                   tmr_8253[chan].latch = dummy_ctr;
 493             else
 494             {
 495                 /* FIXME: intelligent hardware timer emulation needed */
 496                 tmr_8253[chan].latch = dummy_ctr;
 497             }
 498             break;
 499         case 3: /* write lo byte, then hi byte */
 500             tmr_8253[chan].byte_toggle = FALSE; /* init */
 501             /* fall through */
 502         case 1: /* write lo byte only */
 503         case 2: /* write hi byte only */
 504             tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 505             break;
 506         }
 507     }
 508     break;
 509     case 0x61:
 510         parport_8255[1] = (BYTE)value;
 511         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 512         {
 513             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 514             Beep(1193180 / tmr_8253[2].countmax, 20);
 515         }
 516         break;
 517     case 0x70:
 518         cmosaddress = (BYTE)value & 0x7f;
 519         break;
 520     case 0x71:
 521         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 522         break;
 523     default:
 524         WARN("Direct I/O write attempted to port %x\n", port );
 525         break;
 526     }
 527 }