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 #ifdef HAVE_UNISTD_H
  36 # include <unistd.h>
  37 #endif
  38 #include "windef.h"
  39 #include "winnls.h"
  40 #include "callback.h"
  41 #include "file.h"
  42 #include "miscemu.h"
  43 #include "wine/debug.h"
  44
  45 WINE_DEFAULT_DEBUG_CHANNEL(int);
  46
  47 static struct {
  48     WORD        countmax;
  49     BOOL16      byte_toggle; /* if TRUE, then hi byte has already been written */
  50     WORD        latch;
  51     BOOL16      latched;
  52     BYTE        ctrlbyte_ch;
  53     WORD        oldval;
  54 } tmr_8253[3] = {
  55     {0xFFFF,    FALSE,  0,      FALSE,  0x36,   0},
  56     {0x0012,    FALSE,  0,      FALSE,  0x74,   0},
  57     {0x0001,    FALSE,  0,      FALSE,  0xB6,   0},
  58 };
  59
  60 static int dummy_ctr = 0;
  61
  62 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  63
  64 static BYTE cmosaddress;
  65
  66 static BYTE cmosimage[64] =
  67 {
  68   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  69   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  70   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  71   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  72   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  73   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
  74   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  75   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  76 };
  77
  78 #if defined(linux) && defined(__i386__)
  79 # define DIRECT_IO_ACCESS
  80 #else
  81 # undef DIRECT_IO_ACCESS
  82 # undef PP_IO_ACCESS
  83 #endif  /* linux && __i386__ */
  84
  85 #ifdef HAVE_PPDEV
  86 static int do_pp_port_access = -1; /* -1: uninitialized, 1: not available
  87                                        0: available);*/
  88 #endif
  89
  90 #ifdef DIRECT_IO_ACCESS
  91
  92 extern int iopl(int level);
  93 static char do_direct_port_access = -1;
  94 static char port_permissions[0x10000];
  95
  96 #define IO_READ  1
  97 #define IO_WRITE 2
  98
  99 static void IO_FixCMOSCheckSum(void)
 100 {
 101         WORD sum = 0;
 102         int i;
 103
 104         for (i=0x10; i < 0x2d; i++)
 105                 sum += cmosimage[i];
 106         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
 107         cmosimage[0x2f] = sum & 0xff;
 108         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
 109 }
 110
 111 #endif  /* DIRECT_IO_ACCESS */
 112
 113 static void set_timer_maxval(unsigned timer, unsigned maxval)
 114 {
 115     switch (timer) {
 116         case 0: /* System timer counter divisor */
 117             if (Dosvm.SetTimer) Dosvm.SetTimer(maxval);
 118             break;
 119         case 1: /* RAM refresh */
 120             FIXME("RAM refresh counter handling not implemented !\n");
 121             break;
 122         case 2: /* cassette & speaker */
 123             /* speaker on ? */
 124             if (((BYTE)parport_8255[1] & 3) == 3)
 125             {
 126                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
 127                 Beep(1193180 / maxval, 20);
 128             }
 129             break;
 130     }
 131 }
 132
 133 /**********************************************************************
 134  *          IO_port_init
 135  */
 136
 137 /* set_IO_permissions(int val1, int val)
 138  * Helper function for IO_port_init
 139  */
 140 #ifdef DIRECT_IO_ACCESS
 141 static void set_IO_permissions(int val1, int val, char rw)
 142 {
 143         int j;
 144         if (val1 != -1) {
 145                 if (val == -1) val = 0x3ff;
 146                 for (j = val1; j <= val; j++)
 147                         port_permissions[j] |= rw;
 148
 149                 do_direct_port_access = 1;
 150
 151                 val1 = -1;
 152         } else if (val != -1) {
 153                 do_direct_port_access = 1;
 154
 155                 port_permissions[val] |= rw;
 156         }
 157
 158 }
 159
 160 /* do_IO_port_init_read_or_write(char* temp, char rw)
 161  * Helper function for IO_port_init
 162  */
 163
 164 static void do_IO_port_init_read_or_write(char* temp, char rw)
 165 {
 166         int val, val1, i, len;
 167         if (!strcasecmp(temp, "all")) {
 168                 MESSAGE("Warning!!! Granting FULL IO port access to"
 169                         " windoze programs!\nWarning!!! "
 170                         "*** THIS IS NOT AT ALL "
 171                         "RECOMMENDED!!! ***\n");
 172                 for (i=0; i < sizeof(port_permissions); i++)
 173                         port_permissions[i] |= rw;
 174
 175         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 176                 len = strlen(temp);
 177                 val = -1;
 178                 val1 = -1;
 179                 for (i = 0; i < len; i++) {
 180                         switch (temp[i]) {
 181                         case '0':
 182                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 183                                         sscanf(temp+i, "%x", &val);
 184                                         i += 2;
 185                                 } else {
 186                                         sscanf(temp+i, "%d", &val);
 187                                 }
 188                                 while (isxdigit(temp[i]))
 189                                         i++;
 190                                 i--;
 191                                 break;
 192                         case ',':
 193                         case ' ':
 194                         case '\t':
 195                                 set_IO_permissions(val1, val, rw);
 196                                 val1 = -1; val = -1;
 197                                 break;
 198                         case '-':
 199                                 val1 = val;
 200                                 if (val1 == -1) val1 = 0;
 201                                 break;
 202                         default:
 203                                 if (temp[i] >= '0' && temp[i] <= '9') {
 204                                         sscanf(temp+i, "%d", &val);
 205                                         while (isdigit(temp[i]))
 206                                                 i++;
 207                                 }
 208                         }
 209                 }
 210                 set_IO_permissions(val1, val, rw);
 211         }
 212 }
 213
 214 static inline BYTE inb( WORD port )
 215 {
 216     BYTE b;
 217     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 218     return b;
 219 }
 220
 221 static inline WORD inw( WORD port )
 222 {
 223     WORD w;
 224     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 225     return w;
 226 }
 227
 228 static inline DWORD inl( WORD port )
 229 {
 230     DWORD dw;
 231     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 232     return dw;
 233 }
 234
 235 static inline void outb( BYTE value, WORD port )
 236 {
 237     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 238 }
 239
 240 static inline void outw( WORD value, WORD port )
 241 {
 242     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 243 }
 244
 245 static inline void outl( DWORD value, WORD port )
 246 {
 247     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 248 }
 249
 250 static void IO_port_init(void)
 251 {
 252         char temp[1024];
 253         WCHAR tempW[1024];
 254         static const WCHAR portsW[] = {'p','o','r','t','s',0};
 255         static const WCHAR readW[] = {'r','e','a','d',0};
 256         static const WCHAR writeW[] = {'w','r','i','t','e',0};
 257         static const WCHAR asteriskW[] = {'*',0};
 258
 259         do_direct_port_access = 0;
 260         /* Can we do that? */
 261         if (!iopl(3)) {
 262                 iopl(0);
 263
 264                 PROFILE_GetWineIniString( portsW, readW, asteriskW, tempW, 1024 );
 265                 WideCharToMultiByte(CP_ACP, 0, tempW, -1, temp, 1024, NULL, NULL);
 266                 do_IO_port_init_read_or_write(temp, IO_READ);
 267                 PROFILE_GetWineIniString( portsW, writeW, asteriskW, tempW, 1024 );
 268                 WideCharToMultiByte(CP_ACP, 0, tempW, -1, temp, 1024, NULL, NULL);
 269                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 270         }
 271     IO_FixCMOSCheckSum();
 272 }
 273
 274 #endif  /* DIRECT_IO_ACCESS */
 275
 276 /**********************************************************************
 277  *          IO_inport
 278  *
 279  * Note: The size argument has to be handled correctly _externally_
 280  * (as we always return a DWORD)
 281  */
 282 DWORD IO_inport( int port, int size )
 283 {
 284     DWORD res = 0;
 285
 286     TRACE("%d-byte value from port 0x%02x\n", size, port );
 287
 288 #ifdef HAVE_PPDEV
 289     if (do_pp_port_access == -1)
 290       do_pp_port_access =IO_pp_init();
 291     if ((do_pp_port_access == 0 ) && (size == 1))
 292       if (!IO_pp_inp(port,&res))
 293          return res;
 294 #endif
 295 #ifdef DIRECT_IO_ACCESS
 296     if (do_direct_port_access == -1) IO_port_init();
 297     if ((do_direct_port_access)
 298         /* Make sure we have access to the port */
 299         && (port_permissions[port] & IO_READ))
 300     {
 301         iopl(3);
 302         switch(size)
 303         {
 304         case 1: res = inb( port ); break;
 305         case 2: res = inw( port ); break;
 306         case 4: res = inl( port ); break;
 307         default:
 308             ERR("invalid data size %d\n", size);
 309         }
 310         iopl(0);
 311         return res;
 312     }
 313 #endif
 314
 315     /* first give the DOS VM a chance to handle it */
 316     if (Dosvm.inport && Dosvm.inport( port, size, &res )) return res;
 317
 318     switch (port)
 319     {
 320     case 0x40:
 321     case 0x41:
 322     case 0x42:
 323     {
 324         BYTE chan = port & 3;
 325         WORD tempval = 0;
 326         if (tmr_8253[chan].latched)
 327             tempval = tmr_8253[chan].latch;
 328         else
 329         {
 330             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 331             if (chan == 0) /* System timer counter divisor */
 332             {
 333                 /* FIXME: Dosvm.GetTimer() returns quite rigid values */
 334                 if (Dosvm.GetTimer)
 335                   tempval = dummy_ctr + (WORD)Dosvm.GetTimer();
 336                 else
 337                   tempval = dummy_ctr;
 338             }
 339             else
 340             {
 341                 /* FIXME: intelligent hardware timer emulation needed */
 342                 tempval = dummy_ctr;
 343             }
 344         }
 345
 346         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 347         {
 348         case 0:
 349             res = 0; /* shouldn't happen? */
 350             break;
 351         case 1: /* read lo byte */
 352             res = (BYTE)tempval;
 353             tmr_8253[chan].latched = FALSE;
 354             break;
 355         case 3: /* read lo byte, then hi byte */
 356             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 357             if (tmr_8253[chan].byte_toggle)
 358             {
 359                 res = (BYTE)tempval;
 360                 break;
 361             }
 362             /* else [fall through if read hi byte !] */
 363         case 2: /* read hi byte */
 364             res = (BYTE)(tempval >> 8);
 365             tmr_8253[chan].latched = FALSE;
 366             break;
 367         }
 368     }
 369     break;
 370     case 0x60:
 371 #if 0 /* what's this port got to do with parport ? */
 372         res = (DWORD)parport_8255[0];
 373 #endif
 374         break;
 375     case 0x61:
 376         res = (DWORD)parport_8255[1];
 377         break;
 378     case 0x62:
 379         res = (DWORD)parport_8255[2];
 380         break;
 381     case 0x70:
 382         res = (DWORD)cmosaddress;
 383         break;
 384     case 0x71:
 385         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 386         break;
 387     case 0x200:
 388     case 0x201:
 389         res = 0xffffffff; /* no joystick */
 390         break;
 391     default:
 392         WARN("Direct I/O read attempted from port %x\n", port);
 393         res = 0xffffffff;
 394         break;
 395     }
 396     TRACE("  returning ( 0x%lx )\n", res );
 397     return res;
 398 }
 399
 400
 401 /**********************************************************************
 402  *          IO_outport
 403  */
 404 void IO_outport( int port, int size, DWORD value )
 405 {
 406     TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 407                  value, size, port );
 408
 409 #ifdef HAVE_PPDEV
 410     if (do_pp_port_access == -1)
 411       do_pp_port_access = IO_pp_init();
 412     if ((do_pp_port_access == 0) && (size == 1))
 413       if (!IO_pp_outp(port,&value))
 414          return;
 415 #endif
 416 #ifdef DIRECT_IO_ACCESS
 417
 418     if (do_direct_port_access == -1) IO_port_init();
 419     if ((do_direct_port_access)
 420         /* Make sure we have access to the port */
 421         && (port_permissions[port] & IO_WRITE))
 422     {
 423         iopl(3);
 424         switch(size)
 425         {
 426         case 1: outb( LOBYTE(value), port ); break;
 427         case 2: outw( LOWORD(value), port ); break;
 428         case 4: outl( value, port ); break;
 429         default:
 430             WARN("Invalid data size %d\n", size);
 431         }
 432         iopl(0);
 433         return;
 434     }
 435 #endif
 436
 437     /* first give the DOS VM a chance to handle it */
 438     if (Dosvm.outport && Dosvm.outport( port, size, value )) return;
 439
 440     switch (port)
 441     {
 442     case 0x40:
 443     case 0x41:
 444     case 0x42:
 445     {
 446         BYTE chan = port & 3;
 447
 448         /* we need to get the oldval before any lo/hi byte change has been made */
 449         if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 450             !tmr_8253[chan].byte_toggle)
 451             tmr_8253[chan].oldval = tmr_8253[chan].countmax;
 452         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 453         {
 454         case 0:
 455             break; /* shouldn't happen? */
 456         case 1: /* write lo byte */
 457             tmr_8253[chan].countmax =
 458                 (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 459             break;
 460         case 3: /* write lo byte, then hi byte */
 461             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 462             if (tmr_8253[chan].byte_toggle)
 463             {
 464                 tmr_8253[chan].countmax =
 465                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 466                 break;
 467             }
 468             /* else [fall through if write hi byte !] */
 469         case 2: /* write hi byte */
 470             tmr_8253[chan].countmax =
 471                 (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 472             break;
 473         }
 474         /* if programming is finished and value has changed
 475            then update to new value */
 476         if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 477              !tmr_8253[chan].byte_toggle) &&
 478             (tmr_8253[chan].countmax != tmr_8253[chan].oldval))
 479             set_timer_maxval(chan, tmr_8253[chan].countmax);
 480     }
 481     break;
 482     case 0x43:
 483     {
 484         BYTE chan = ((BYTE)value & 0xc0) >> 6;
 485         /* ctrl byte for specific timer channel */
 486         if (chan == 3)
 487         {
 488             FIXME("8254 timer readback not implemented yet\n");
 489             break;
 490         }
 491         switch (((BYTE)value & 0x30) >> 4)
 492         {
 493         case 0: /* latch timer */
 494             tmr_8253[chan].latched = TRUE;
 495             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 496             if (chan == 0) /* System timer divisor */
 497                 if (Dosvm.GetTimer)
 498                   tmr_8253[chan].latch = dummy_ctr + (WORD)Dosvm.GetTimer();
 499                 else
 500                   tmr_8253[chan].latch = dummy_ctr;
 501             else
 502             {
 503                 /* FIXME: intelligent hardware timer emulation needed */
 504                 tmr_8253[chan].latch = dummy_ctr;
 505             }
 506             break;
 507         case 3: /* write lo byte, then hi byte */
 508             tmr_8253[chan].byte_toggle = FALSE; /* init */
 509             /* fall through */
 510         case 1: /* write lo byte only */
 511         case 2: /* write hi byte only */
 512             tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 513             break;
 514         }
 515     }
 516     break;
 517     case 0x61:
 518         parport_8255[1] = (BYTE)value;
 519         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 520         {
 521             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 522             Beep(1193180 / tmr_8253[2].countmax, 20);
 523         }
 524         break;
 525     case 0x70:
 526         cmosaddress = (BYTE)value & 0x7f;
 527         break;
 528     case 0x71:
 529         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 530         break;
 531     default:
 532         WARN("Direct I/O write attempted to port %x\n", port );
 533         break;
 534     }
 535 }