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 #include "wine/port.h"
  30
  31 #include <ctype.h>
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <time.h>
  36 #ifdef HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39 #include "windef.h"
  40 #include "winnls.h"
  41 #include "callback.h"
  42 #include "file.h"
  43 #include "miscemu.h"
  44 #include "wine/debug.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(int);
  47
  48 static struct {
  49     WORD        countmax;
  50     BOOL16      byte_toggle; /* if TRUE, then hi byte has already been written */
  51     WORD        latch;
  52     BOOL16      latched;
  53     BYTE        ctrlbyte_ch;
  54     WORD        oldval;
  55 } tmr_8253[3] = {
  56     {0xFFFF,    FALSE,  0,      FALSE,  0x36,   0},
  57     {0x0012,    FALSE,  0,      FALSE,  0x74,   0},
  58     {0x0001,    FALSE,  0,      FALSE,  0xB6,   0},
  59 };
  60
  61 static int dummy_ctr = 0;
  62
  63 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  64
  65 static BYTE cmosaddress;
  66
  67 static BYTE cmosimage[64] =
  68 {
  69   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  70   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  71   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  72   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  73   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  74   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
  75   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  76   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  77 };
  78
  79 #if defined(linux) && defined(__i386__)
  80 # define DIRECT_IO_ACCESS
  81 #else
  82 # undef DIRECT_IO_ACCESS
  83 # undef PP_IO_ACCESS
  84 #endif  /* linux && __i386__ */
  85
  86 #ifdef HAVE_PPDEV
  87 static int do_pp_port_access = -1; /* -1: uninitialized, 1: not available
  88                                        0: available);*/
  89 #endif
  90
  91 #ifdef DIRECT_IO_ACCESS
  92
  93 extern int iopl(int level);
  94 static char do_direct_port_access = -1;
  95 static char port_permissions[0x10000];
  96
  97 #define IO_READ  1
  98 #define IO_WRITE 2
  99
 100 static void IO_FixCMOSCheckSum(void)
 101 {
 102         WORD sum = 0;
 103         int i;
 104
 105         for (i=0x10; i < 0x2d; i++)
 106                 sum += cmosimage[i];
 107         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
 108         cmosimage[0x2f] = sum & 0xff;
 109         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
 110 }
 111
 112 #endif  /* DIRECT_IO_ACCESS */
 113
 114 static void set_timer_maxval(unsigned timer, unsigned maxval)
 115 {
 116     switch (timer) {
 117         case 0: /* System timer counter divisor */
 118             if (Dosvm.SetTimer) Dosvm.SetTimer(maxval);
 119             break;
 120         case 1: /* RAM refresh */
 121             FIXME("RAM refresh counter handling not implemented !\n");
 122             break;
 123         case 2: /* cassette & speaker */
 124             /* speaker on ? */
 125             if (((BYTE)parport_8255[1] & 3) == 3)
 126             {
 127                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
 128                 Beep(1193180 / maxval, 20);
 129             }
 130             break;
 131     }
 132 }
 133
 134 /**********************************************************************
 135  *          IO_port_init
 136  */
 137
 138 /* set_IO_permissions(int val1, int val)
 139  * Helper function for IO_port_init
 140  */
 141 #ifdef DIRECT_IO_ACCESS
 142 static void set_IO_permissions(int val1, int val, char rw)
 143 {
 144         int j;
 145         if (val1 != -1) {
 146                 if (val == -1) val = 0x3ff;
 147                 for (j = val1; j <= val; j++)
 148                         port_permissions[j] |= rw;
 149
 150                 do_direct_port_access = 1;
 151
 152                 val1 = -1;
 153         } else if (val != -1) {
 154                 do_direct_port_access = 1;
 155
 156                 port_permissions[val] |= rw;
 157         }
 158
 159 }
 160
 161 /* do_IO_port_init_read_or_write(char* temp, char rw)
 162  * Helper function for IO_port_init
 163  */
 164
 165 static void do_IO_port_init_read_or_write(char* temp, char rw)
 166 {
 167         int val, val1, i, len;
 168         if (!strcasecmp(temp, "all")) {
 169                 MESSAGE("Warning!!! Granting FULL IO port access to"
 170                         " windoze programs!\nWarning!!! "
 171                         "*** THIS IS NOT AT ALL "
 172                         "RECOMMENDED!!! ***\n");
 173                 for (i=0; i < sizeof(port_permissions); i++)
 174                         port_permissions[i] |= rw;
 175
 176         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 177                 len = strlen(temp);
 178                 val = -1;
 179                 val1 = -1;
 180                 for (i = 0; i < len; i++) {
 181                         switch (temp[i]) {
 182                         case '0':
 183                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 184                                         sscanf(temp+i, "%x", &val);
 185                                         i += 2;
 186                                 } else {
 187                                         sscanf(temp+i, "%d", &val);
 188                                 }
 189                                 while (isxdigit(temp[i]))
 190                                         i++;
 191                                 i--;
 192                                 break;
 193                         case ',':
 194                         case ' ':
 195                         case '\t':
 196                                 set_IO_permissions(val1, val, rw);
 197                                 val1 = -1; val = -1;
 198                                 break;
 199                         case '-':
 200                                 val1 = val;
 201                                 if (val1 == -1) val1 = 0;
 202                                 break;
 203                         default:
 204                                 if (temp[i] >= '0' && temp[i] <= '9') {
 205                                         sscanf(temp+i, "%d", &val);
 206                                         while (isdigit(temp[i]))
 207                                                 i++;
 208                                 }
 209                         }
 210                 }
 211                 set_IO_permissions(val1, val, rw);
 212         }
 213 }
 214
 215 static inline BYTE inb( WORD port )
 216 {
 217     BYTE b;
 218     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 219     return b;
 220 }
 221
 222 static inline WORD inw( WORD port )
 223 {
 224     WORD w;
 225     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 226     return w;
 227 }
 228
 229 static inline DWORD inl( WORD port )
 230 {
 231     DWORD dw;
 232     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 233     return dw;
 234 }
 235
 236 static inline void outb( BYTE value, WORD port )
 237 {
 238     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 239 }
 240
 241 static inline void outw( WORD value, WORD port )
 242 {
 243     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 244 }
 245
 246 static inline void outl( DWORD value, WORD port )
 247 {
 248     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 249 }
 250
 251 static void IO_port_init(void)
 252 {
 253         char temp[1024];
 254         WCHAR tempW[1024];
 255         static const WCHAR portsW[] = {'p','o','r','t','s',0};
 256         static const WCHAR readW[] = {'r','e','a','d',0};
 257         static const WCHAR writeW[] = {'w','r','i','t','e',0};
 258         static const WCHAR asteriskW[] = {'*',0};
 259
 260         do_direct_port_access = 0;
 261         /* Can we do that? */
 262         if (!iopl(3)) {
 263                 iopl(0);
 264
 265                 PROFILE_GetWineIniString( portsW, readW, asteriskW, tempW, 1024 );
 266                 WideCharToMultiByte(CP_ACP, 0, tempW, -1, temp, 1024, NULL, NULL);
 267                 do_IO_port_init_read_or_write(temp, IO_READ);
 268                 PROFILE_GetWineIniString( portsW, writeW, asteriskW, tempW, 1024 );
 269                 WideCharToMultiByte(CP_ACP, 0, tempW, -1, temp, 1024, NULL, NULL);
 270                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 271         }
 272     IO_FixCMOSCheckSum();
 273 }
 274
 275 #endif  /* DIRECT_IO_ACCESS */
 276
 277 /**********************************************************************
 278  *          IO_inport
 279  *
 280  * Note: The size argument has to be handled correctly _externally_
 281  * (as we always return a DWORD)
 282  */
 283 DWORD IO_inport( int port, int size )
 284 {
 285     DWORD res = 0;
 286
 287     TRACE("%d-byte value from port 0x%02x\n", size, port );
 288
 289 #ifdef HAVE_PPDEV
 290     if (do_pp_port_access == -1)
 291       do_pp_port_access =IO_pp_init();
 292     if ((do_pp_port_access == 0 ) && (size == 1))
 293       if (!IO_pp_inp(port,&res))
 294          return res;
 295 #endif
 296 #ifdef DIRECT_IO_ACCESS
 297     if (do_direct_port_access == -1) IO_port_init();
 298     if ((do_direct_port_access)
 299         /* Make sure we have access to the port */
 300         && (port_permissions[port] & IO_READ))
 301     {
 302         iopl(3);
 303         switch(size)
 304         {
 305         case 1: res = inb( port ); break;
 306         case 2: res = inw( port ); break;
 307         case 4: res = inl( port ); break;
 308         default:
 309             ERR("invalid data size %d\n", size);
 310         }
 311         iopl(0);
 312         return res;
 313     }
 314 #endif
 315
 316     /* first give the DOS VM a chance to handle it */
 317     if (Dosvm.inport && Dosvm.inport( port, size, &res )) return res;
 318
 319     switch (port)
 320     {
 321     case 0x40:
 322     case 0x41:
 323     case 0x42:
 324     {
 325         BYTE chan = port & 3;
 326         WORD tempval = 0;
 327         if (tmr_8253[chan].latched)
 328             tempval = tmr_8253[chan].latch;
 329         else
 330         {
 331             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 332             if (chan == 0) /* System timer counter divisor */
 333             {
 334                 /* FIXME: Dosvm.GetTimer() returns quite rigid values */
 335                 if (Dosvm.GetTimer)
 336                   tempval = dummy_ctr + (WORD)Dosvm.GetTimer();
 337                 else
 338                   tempval = dummy_ctr;
 339             }
 340             else
 341             {
 342                 /* FIXME: intelligent hardware timer emulation needed */
 343                 tempval = dummy_ctr;
 344             }
 345         }
 346
 347         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 348         {
 349         case 0:
 350             res = 0; /* shouldn't happen? */
 351             break;
 352         case 1: /* read lo byte */
 353             res = (BYTE)tempval;
 354             tmr_8253[chan].latched = FALSE;
 355             break;
 356         case 3: /* read lo byte, then hi byte */
 357             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 358             if (tmr_8253[chan].byte_toggle)
 359             {
 360                 res = (BYTE)tempval;
 361                 break;
 362             }
 363             /* else [fall through if read hi byte !] */
 364         case 2: /* read hi byte */
 365             res = (BYTE)(tempval >> 8);
 366             tmr_8253[chan].latched = FALSE;
 367             break;
 368         }
 369     }
 370     break;
 371     case 0x60:
 372 #if 0 /* what's this port got to do with parport ? */
 373         res = (DWORD)parport_8255[0];
 374 #endif
 375         break;
 376     case 0x61:
 377         res = (DWORD)parport_8255[1];
 378         break;
 379     case 0x62:
 380         res = (DWORD)parport_8255[2];
 381         break;
 382     case 0x70:
 383         res = (DWORD)cmosaddress;
 384         break;
 385     case 0x71:
 386         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 387         break;
 388     case 0x200:
 389     case 0x201:
 390         res = 0xffffffff; /* no joystick */
 391         break;
 392     default:
 393         WARN("Direct I/O read attempted from port %x\n", port);
 394         res = 0xffffffff;
 395         break;
 396     }
 397     TRACE("  returning ( 0x%lx )\n", res );
 398     return res;
 399 }
 400
 401
 402 /**********************************************************************
 403  *          IO_outport
 404  */
 405 void IO_outport( int port, int size, DWORD value )
 406 {
 407     TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 408                  value, size, port );
 409
 410 #ifdef HAVE_PPDEV
 411     if (do_pp_port_access == -1)
 412       do_pp_port_access = IO_pp_init();
 413     if ((do_pp_port_access == 0) && (size == 1))
 414       if (!IO_pp_outp(port,&value))
 415          return;
 416 #endif
 417 #ifdef DIRECT_IO_ACCESS
 418
 419     if (do_direct_port_access == -1) IO_port_init();
 420     if ((do_direct_port_access)
 421         /* Make sure we have access to the port */
 422         && (port_permissions[port] & IO_WRITE))
 423     {
 424         iopl(3);
 425         switch(size)
 426         {
 427         case 1: outb( LOBYTE(value), port ); break;
 428         case 2: outw( LOWORD(value), port ); break;
 429         case 4: outl( value, port ); break;
 430         default:
 431             WARN("Invalid data size %d\n", size);
 432         }
 433         iopl(0);
 434         return;
 435     }
 436 #endif
 437
 438     /* first give the DOS VM a chance to handle it */
 439     if (Dosvm.outport && Dosvm.outport( port, size, value )) return;
 440
 441     switch (port)
 442     {
 443     case 0x40:
 444     case 0x41:
 445     case 0x42:
 446     {
 447         BYTE chan = port & 3;
 448
 449         /* we need to get the oldval before any lo/hi byte change has been made */
 450         if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 451             !tmr_8253[chan].byte_toggle)
 452             tmr_8253[chan].oldval = tmr_8253[chan].countmax;
 453         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 454         {
 455         case 0:
 456             break; /* shouldn't happen? */
 457         case 1: /* write lo byte */
 458             tmr_8253[chan].countmax =
 459                 (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 460             break;
 461         case 3: /* write lo byte, then hi byte */
 462             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 463             if (tmr_8253[chan].byte_toggle)
 464             {
 465                 tmr_8253[chan].countmax =
 466                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 467                 break;
 468             }
 469             /* else [fall through if write hi byte !] */
 470         case 2: /* write hi byte */
 471             tmr_8253[chan].countmax =
 472                 (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 473             break;
 474         }
 475         /* if programming is finished and value has changed
 476            then update to new value */
 477         if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 478              !tmr_8253[chan].byte_toggle) &&
 479             (tmr_8253[chan].countmax != tmr_8253[chan].oldval))
 480             set_timer_maxval(chan, tmr_8253[chan].countmax);
 481     }
 482     break;
 483     case 0x43:
 484     {
 485         BYTE chan = ((BYTE)value & 0xc0) >> 6;
 486         /* ctrl byte for specific timer channel */
 487         if (chan == 3)
 488         {
 489             FIXME("8254 timer readback not implemented yet\n");
 490             break;
 491         }
 492         switch (((BYTE)value & 0x30) >> 4)
 493         {
 494         case 0: /* latch timer */
 495             tmr_8253[chan].latched = TRUE;
 496             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 497             if (chan == 0) /* System timer divisor */
 498                 if (Dosvm.GetTimer)
 499                   tmr_8253[chan].latch = dummy_ctr + (WORD)Dosvm.GetTimer();
 500                 else
 501                   tmr_8253[chan].latch = dummy_ctr;
 502             else
 503             {
 504                 /* FIXME: intelligent hardware timer emulation needed */
 505                 tmr_8253[chan].latch = dummy_ctr;
 506             }
 507             break;
 508         case 3: /* write lo byte, then hi byte */
 509             tmr_8253[chan].byte_toggle = FALSE; /* init */
 510             /* fall through */
 511         case 1: /* write lo byte only */
 512         case 2: /* write hi byte only */
 513             tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 514             break;
 515         }
 516     }
 517     break;
 518     case 0x61:
 519         parport_8255[1] = (BYTE)value;
 520         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 521         {
 522             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 523             Beep(1193180 / tmr_8253[2].countmax, 20);
 524         }
 525         break;
 526     case 0x70:
 527         cmosaddress = (BYTE)value & 0x7f;
 528         break;
 529     case 0x71:
 530         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 531         break;
 532     default:
 533         WARN("Direct I/O write attempted to port %x\n", port );
 534         break;
 535     }
 536 }