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