dlls/winedos/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 <stdarg.h>
  31 #include <stdlib.h>
  32
  33 #include "windef.h"
  34 #include "winbase.h"
  35 #include "winnls.h"
  36 #include "winreg.h"
  37 #include "winternl.h"
  38 #include "dosexe.h"
  39 #include "vga.h"
  40 #include "wine/unicode.h"
  41 #include "wine/debug.h"
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(int);
  44
  45 #if defined(linux) && defined(__i386__)
  46 # define DIRECT_IO_ACCESS
  47 #else
  48 # undef DIRECT_IO_ACCESS
  49 #endif  /* linux && __i386__ */
  50
  51 static struct {
  52     WORD        countmax;
  53     WORD        latch;
  54     BYTE        ctrlbyte_ch;
  55     BYTE        flags;
  56     LONG64      start_time;
  57 } tmr_8253[3] = {
  58     {0xFFFF,    0,      0x36,   0,      0},
  59     {0x0012,    0,      0x74,   0,      0},
  60     {0x0001,    0,      0xB6,   0,      0},
  61 };
  62 /* two byte read in progress */
  63 #define TMR_RTOGGLE 0x01
  64 /* two byte write in progress */
  65 #define TMR_WTOGGLE 0x02
  66 /* latch contains data */
  67 #define TMR_LATCHED 0x04
  68 /* counter is in update phase */
  69 #define TMR_UPDATE  0x08
  70 /* readback status request */
  71 #define TMR_STATUS  0x10
  72
  73
  74 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  75
  76 static BYTE cmosaddress;
  77
  78 static int cmos_image_initialized = 0;
  79
  80 static BYTE cmosimage[64] =
  81 {
  82   0x27, /* 0x00: seconds */
  83   0x34, /* 0X01: seconds alarm */
  84   0x31, /* 0x02: minutes */
  85   0x47, /* 0x03: minutes alarm */
  86   0x16, /* 0x04: hour */
  87   0x15, /* 0x05: hour alarm */
  88   0x00, /* 0x06: week day */
  89   0x01, /* 0x07: month day */
  90   0x04, /* 0x08: month */
  91   0x94, /* 0x09: year */
  92   0x26, /* 0x0a: state A */
  93   0x02, /* 0x0b: state B */
  94   0x50, /* 0x0c: state C */
  95   0x80, /* 0x0d: state D */
  96   0x00, /* 0x0e: state diagnostic */
  97   0x00, /* 0x0f: state state shutdown */
  98   0x40, /* 0x10: floppy type */
  99   0xb1, /* 0x11: reserved */
 100   0x00, /* 0x12: HD type */
 101   0x9c, /* 0x13: reserved */
 102   0x01, /* 0x14: equipment */
 103   0x80, /* 0x15: low base memory */
 104   0x02, /* 0x16: high base memory (0x280 => 640KB) */
 105   0x00, /* 0x17: low extended memory */
 106   0x3b, /* 0x18: high extended memory (0x3b00 => 15MB) */
 107   0x00, /* 0x19: HD 1 extended type byte */
 108   0x00, /* 0x1a: HD 2 extended type byte */
 109   0xad, /* 0x1b: reserved */
 110   0x02, /* 0x1c: reserved */
 111   0x10, /* 0x1d: reserved */
 112   0x00, /* 0x1e: reserved */
 113   0x00, /* 0x1f: installed features */
 114   0x08, /* 0x20: HD 1 low cylinder number */
 115   0x00, /* 0x21: HD 1 high cylinder number */
 116   0x00, /* 0x22: HD 1 heads */
 117   0x26, /* 0x23: HD 1 low pre-compensation start */
 118   0x00, /* 0x24: HD 1 high pre-compensation start */
 119   0x00, /* 0x25: HD 1 low landing zone */
 120   0x00, /* 0x26: HD 1 high landing zone */
 121   0x00, /* 0x27: HD 1 sectors */
 122   0x00, /* 0x28: options 1 */
 123   0x00, /* 0x29: reserved */
 124   0x00, /* 0x2a: reserved */
 125   0x00, /* 0x2b: options 2 */
 126   0x00, /* 0x2c: options 3 */
 127   0x3f, /* 0x2d: reserved  */
 128   0xcc, /* 0x2e: low CMOS ram checksum (computed automatically) */
 129   0xcc, /* 0x2f: high CMOS ram checksum (computed automatically) */
 130   0x00, /* 0x30: low extended memory byte */
 131   0x1c, /* 0x31: high extended memory byte */
 132   0x19, /* 0x32: century byte */
 133   0x81, /* 0x33: setup information */
 134   0x00, /* 0x34: CPU speed */
 135   0x0e, /* 0x35: HD 2 low cylinder number */
 136   0x00, /* 0x36: HD 2 high cylinder number */
 137   0x80, /* 0x37: HD 2 heads */
 138   0x1b, /* 0x38: HD 2 low pre-compensation start */
 139   0x7b, /* 0x39: HD 2 high pre-compensation start */
 140   0x21, /* 0x3a: HD 2 low landing zone */
 141   0x00, /* 0x3b: HD 2 high landing zone */
 142   0x00, /* 0x3c: HD 2 sectors */
 143   0x00, /* 0x3d: reserved */
 144   0x05, /* 0x3e: reserved */
 145   0x5f  /* 0x3f: reserved */
 146 };
 147
 148 static void IO_FixCMOSCheckSum(void)
 149 {
 150         WORD sum = 0;
 151         int i;
 152
 153         for (i=0x10; i < 0x2d; i++)
 154                 sum += cmosimage[i];
 155         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
 156         cmosimage[0x2f] = sum & 0xff;
 157         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
 158 }
 159
 160 #ifdef DIRECT_IO_ACCESS
 161
 162 extern int iopl(int level);
 163 static char do_direct_port_access = -1;
 164 static char port_permissions[0x10000];
 165
 166 #define IO_READ  1
 167 #define IO_WRITE 2
 168
 169 #endif  /* DIRECT_IO_ACCESS */
 170
 171 #ifdef HAVE_PPDEV
 172 static int do_pp_port_access = -1; /* -1: uninitialized, 1: not available
 173                                        0: available);*/
 174 #endif
 175
 176 #define BCD2BIN(a) \
 177 ((a)%10 + ((a)>>4)%10*10 + ((a)>>8)%10*100 + ((a)>>12)%10*1000)
 178 #define BIN2BCD(a) \
 179 ((a)%10 | (a)/10%10<<4 | (a)/100%10<<8 | (a)/1000%10<<12)
 180
 181
 182 static void set_timer(unsigned timer)
 183 {
 184     DWORD val = tmr_8253[timer].countmax;
 185
 186     if (tmr_8253[timer].ctrlbyte_ch & 0x01)
 187         val = BCD2BIN(val);
 188
 189     tmr_8253[timer].flags &= ~TMR_UPDATE;
 190     if (!QueryPerformanceCounter((LARGE_INTEGER*)&tmr_8253[timer].start_time))
 191         WARN("QueryPerformanceCounter should not fail!\n");
 192
 193     switch (timer) {
 194         case 0: /* System timer counter divisor */
 195             DOSVM_SetTimer(val);
 196             break;
 197         case 1: /* RAM refresh */
 198             FIXME("RAM refresh counter handling not implemented !\n");
 199             break;
 200         case 2: /* cassette & speaker */
 201             /* speaker on ? */
 202             if ((parport_8255[1] & 3) == 3)
 203             {
 204                 TRACE("Beep (freq: %d) !\n", 1193180 / val);
 205                 Beep(1193180 / val, 20);
 206             }
 207             break;
 208     }
 209 }
 210
 211
 212 static WORD get_timer_val(unsigned timer)
 213 {
 214     LARGE_INTEGER time;
 215     WORD maxval, val = tmr_8253[timer].countmax;
 216     BYTE mode = tmr_8253[timer].ctrlbyte_ch >> 1 & 0x07;
 217
 218     /* This is not strictly correct. In most cases the old countdown should
 219      * finish normally (by counting down to 0) or halt and not jump to 0.
 220      * But we are calculating and not countig, so this seems to be a good
 221      * solution and should work well with most (all?) programs
 222      */
 223     if (tmr_8253[timer].flags & TMR_UPDATE)
 224         return 0;
 225
 226     if (!QueryPerformanceCounter(&time))
 227         WARN("QueryPerformanceCounter should not fail!\n");
 228
 229     time.QuadPart -= tmr_8253[timer].start_time;
 230     if (tmr_8253[timer].ctrlbyte_ch & 0x01)
 231         val = BCD2BIN(val);
 232
 233     switch ( mode )
 234     {
 235         case 0:
 236         case 1:
 237         case 4:
 238         case 5:
 239             maxval = tmr_8253[timer].ctrlbyte_ch & 0x01 ? 9999 : 0xFFFF;
 240             break;
 241         case 2:
 242         case 3:
 243             maxval = val;
 244             break;
 245         default:
 246             ERR("Invalid PIT mode: %d\n", mode);
 247             return 0;
 248     }
 249
 250     val = (val - time.QuadPart) % (maxval + 1);
 251     if (tmr_8253[timer].ctrlbyte_ch & 0x01)
 252         val = BIN2BCD(val);
 253
 254     return val;
 255 }
 256
 257
 258 /**********************************************************************
 259  *          IO_port_init
 260  */
 261
 262 /* set_IO_permissions(int val1, int val)
 263  * Helper function for IO_port_init
 264  */
 265 #ifdef DIRECT_IO_ACCESS
 266 static void set_IO_permissions(int val1, int val, char rw)
 267 {
 268         int j;
 269         if (val1 != -1) {
 270                 if (val == -1) val = 0x3ff;
 271                 for (j = val1; j <= val; j++)
 272                         port_permissions[j] |= rw;
 273
 274                 do_direct_port_access = 1;
 275
 276                 val1 = -1;
 277         } else if (val != -1) {
 278                 do_direct_port_access = 1;
 279
 280                 port_permissions[val] |= rw;
 281         }
 282
 283 }
 284
 285 /* do_IO_port_init_read_or_write(char* temp, char rw)
 286  * Helper function for IO_port_init
 287  */
 288
 289 static void do_IO_port_init_read_or_write(const WCHAR *str, char rw)
 290 {
 291     int val, val1;
 292     unsigned int i;
 293     WCHAR *end;
 294     static const WCHAR allW[] = {'a','l','l',0};
 295
 296     if (!strcmpiW(str, allW))
 297     {
 298         for (i=0; i < sizeof(port_permissions); i++)
 299             port_permissions[i] |= rw;
 300     }
 301     else
 302     {
 303         val = -1;
 304         val1 = -1;
 305         while (*str)
 306         {
 307             switch(*str)
 308             {
 309             case ',':
 310             case ' ':
 311             case '\t':
 312                 set_IO_permissions(val1, val, rw);
 313                 val1 = -1;
 314                 val = -1;
 315                 str++;
 316                 break;
 317             case '-':
 318                 val1 = val;
 319                 if (val1 == -1) val1 = 0;
 320                 str++;
 321                 break;
 322             default:
 323                 if (isdigitW(*str))
 324                 {
 325                     val = strtoulW( str, &end, 0 );
 326                     if (end == str)
 327                     {
 328                         val = -1;
 329                         str++;
 330                     }
 331                     else str = end;
 332                 }
 333                 break;
 334             }
 335         }
 336         set_IO_permissions(val1, val, rw);
 337     }
 338 }
 339
 340 static inline BYTE inb( WORD port )
 341 {
 342     BYTE b;
 343     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 344     return b;
 345 }
 346
 347 static inline WORD inw( WORD port )
 348 {
 349     WORD w;
 350     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 351     return w;
 352 }
 353
 354 static inline DWORD inl( WORD port )
 355 {
 356     DWORD dw;
 357     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 358     return dw;
 359 }
 360
 361 static inline void outb( BYTE value, WORD port )
 362 {
 363     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 364 }
 365
 366 static inline void outw( WORD value, WORD port )
 367 {
 368     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 369 }
 370
 371 static inline void outl( DWORD value, WORD port )
 372 {
 373     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 374 }
 375
 376 static void IO_port_init(void)
 377 {
 378     char tmp[1024];
 379     HANDLE root, hkey;
 380     DWORD dummy;
 381     OBJECT_ATTRIBUTES attr;
 382     UNICODE_STRING nameW;
 383
 384     static const WCHAR portsW[] = {'S','o','f','t','w','a','r','e','\\',
 385                                    'W','i','n','e','\\','V','D','M','\\','P','o','r','t','s',0};
 386     static const WCHAR readW[] = {'r','e','a','d',0};
 387     static const WCHAR writeW[] = {'w','r','i','t','e',0};
 388
 389     do_direct_port_access = 0;
 390     /* Can we do that? */
 391     if (!iopl(3))
 392     {
 393         iopl(0);
 394
 395         RtlOpenCurrentUser( KEY_ALL_ACCESS, &root );
 396         attr.Length = sizeof(attr);
 397         attr.RootDirectory = root;
 398         attr.ObjectName = &nameW;
 399         attr.Attributes = 0;
 400         attr.SecurityDescriptor = NULL;
 401         attr.SecurityQualityOfService = NULL;
 402         RtlInitUnicodeString( &nameW, portsW );
 403
 404         /* @@ Wine registry key: HKCU\Software\Wine\VDM\Ports */
 405         if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr ))
 406         {
 407             RtlInitUnicodeString( &nameW, readW );
 408             if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, tmp, sizeof(tmp), &dummy ))
 409             {
 410                 WCHAR *str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)tmp)->Data;
 411                 do_IO_port_init_read_or_write(str, IO_READ);
 412             }
 413             RtlInitUnicodeString( &nameW, writeW );
 414             if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, tmp, sizeof(tmp), &dummy ))
 415             {
 416                 WCHAR *str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)tmp)->Data;
 417                 do_IO_port_init_read_or_write(str, IO_WRITE);
 418             }
 419             NtClose( hkey );
 420         }
 421         NtClose( root );
 422     }
 423 }
 424
 425 #endif  /* DIRECT_IO_ACCESS */
 426
 427
 428 /**********************************************************************
 429  *          inport   (WINEDOS.@)
 430  *
 431  * Note: The size argument has to be handled correctly _externally_
 432  * (as we always return a DWORD)
 433  */
 434 DWORD WINAPI DOSVM_inport( int port, int size )
 435 {
 436     DWORD res = ~0U;
 437
 438     TRACE("%d-byte value from port 0x%04x\n", size, port );
 439
 440 #ifdef HAVE_PPDEV
 441     if (do_pp_port_access == -1) do_pp_port_access =IO_pp_init();
 442     if ((do_pp_port_access == 0 ) && (size == 1))
 443     {
 444         if (!IO_pp_inp(port,&res)) return res;
 445     }
 446 #endif
 447
 448 #ifdef DIRECT_IO_ACCESS
 449     if (do_direct_port_access == -1) IO_port_init();
 450     if ((do_direct_port_access)
 451         /* Make sure we have access to the port */
 452         && (port_permissions[port] & IO_READ))
 453     {
 454         iopl(3);
 455         switch(size)
 456         {
 457         case 1: res = inb( port ); break;
 458         case 2: res = inw( port ); break;
 459         case 4: res = inl( port ); break;
 460         }
 461         iopl(0);
 462         return res;
 463     }
 464 #endif
 465
 466     switch (port)
 467     {
 468     case 0x40:
 469     case 0x41:
 470     case 0x42:
 471         {
 472             BYTE chan = port & 3;
 473             WORD tempval = tmr_8253[chan].flags & TMR_LATCHED
 474                 ? tmr_8253[chan].latch : get_timer_val(chan);
 475
 476             if (tmr_8253[chan].flags & TMR_STATUS)
 477             {
 478                 WARN("Read-back status\n");
 479                 /* We differ slightly from the spec:
 480                  * - TMR_UPDATE is already set with the first write
 481                  *   of a two byte counter update
 482                  * - 0x80 should be set if OUT signal is 1 (high)
 483                  */
 484                 tmr_8253[chan].flags &= ~TMR_STATUS;
 485                 res = (tmr_8253[chan].ctrlbyte_ch & 0x3F) |
 486                     (tmr_8253[chan].flags & TMR_UPDATE ? 0x40 : 0x00);
 487                 break;
 488             }
 489             switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 490             {
 491             case 0:
 492                 res = 0; /* shouldn't happen? */
 493                 break;
 494             case 1: /* read lo byte */
 495                 res = (BYTE)tempval;
 496                 tmr_8253[chan].flags &= ~TMR_LATCHED;
 497                 break;
 498             case 3: /* read lo byte, then hi byte */
 499                 tmr_8253[chan].flags ^= TMR_RTOGGLE; /* toggle */
 500                 if (tmr_8253[chan].flags & TMR_RTOGGLE)
 501                 {
 502                     res = (BYTE)tempval;
 503                     break;
 504                 }
 505                 /* else [fall through if read hi byte !] */
 506             case 2: /* read hi byte */
 507                 res = (BYTE)(tempval >> 8);
 508                 tmr_8253[chan].flags &= ~TMR_LATCHED;
 509                 break;
 510             }
 511         }
 512         break;
 513     case 0x60:
 514         res = DOSVM_Int09ReadScan(NULL);
 515         break;
 516     case 0x61:
 517         res = (DWORD)parport_8255[1];
 518         break;
 519     case 0x62:
 520         res = (DWORD)parport_8255[2];
 521         break;
 522     case 0x70:
 523         res = (DWORD)cmosaddress;
 524         break;
 525     case 0x71:
 526         if (!cmos_image_initialized)
 527         {
 528             IO_FixCMOSCheckSum();
 529             cmos_image_initialized = 1;
 530         }
 531         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 532         break;
 533     case 0x200:
 534     case 0x201:
 535         res = ~0U; /* no joystick */
 536         break;
 537     case 0x22a:
 538     case 0x22c:
 539     case 0x22e:
 540         res = (DWORD)SB_ioport_in( port );
 541         break;
 542     /* VGA read registers */
 543     case 0x3b4:  /* CRT Controller Register - Index (MDA) */
 544     case 0x3b5:  /* CRT Controller Register - Other (MDA) */
 545     case 0x3ba:  /* General Register - Input status 1 (MDA) */
 546     case 0x3c0:  /* Attribute Controller - Address */
 547     case 0x3c1:  /* Attribute Controller - Other */
 548     case 0x3c2:  /* General Register - Input status 0 */
 549     case 0x3c3:  /* General Register - Video subsystem enable */
 550     case 0x3c4:  /* Sequencer Register - Address */
 551     case 0x3c5:  /* Sequencer Register - Other */
 552     case 0x3c6:
 553     case 0x3c7:  /* General Register -  DAC State */
 554     case 0x3c8:
 555     case 0x3c9:
 556     case 0x3ca:  /* General Register - Feature control */
 557     case 0x3cb:
 558     case 0x3cc:  /* General Register - Misc output */
 559     case 0x3cd:
 560     case 0x3ce:  /* Graphics Controller Register - Address */
 561     case 0x3cf:  /* Graphics Controller Register - Other */
 562     case 0x3d0:
 563     case 0x3d1:
 564     case 0x3d2:
 565     case 0x3d3:
 566     case 0x3d4:  /* CRT Controller Register - Index (CGA) */
 567     case 0x3d5:  /* CRT Controller Register - Other (CGA) */
 568     case 0x3d6:
 569     case 0x3d7:
 570     case 0x3d8:
 571     case 0x3d9:
 572     case 0x3da:
 573     case 0x3db:
 574     case 0x3dc:
 575     case 0x3dd:
 576     case 0x3de:
 577     case 0x3df:
 578         if (size > 1)
 579             FIXME("Trying to read more than one byte from VGA!\n");
 580         res = (DWORD)VGA_ioport_in( port );
 581         break;
 582     case 0x00:
 583     case 0x01:
 584     case 0x02:
 585     case 0x03:
 586     case 0x04:
 587     case 0x05:
 588     case 0x06:
 589     case 0x07:
 590     case 0xC0:
 591     case 0xC2:
 592     case 0xC4:
 593     case 0xC6:
 594     case 0xC8:
 595     case 0xCA:
 596     case 0xCC:
 597     case 0xCE:
 598     case 0x87:
 599     case 0x83:
 600     case 0x81:
 601     case 0x82:
 602     case 0x8B:
 603     case 0x89:
 604     case 0x8A:
 605     case 0x487:
 606     case 0x483:
 607     case 0x481:
 608     case 0x482:
 609     case 0x48B:
 610     case 0x489:
 611     case 0x48A:
 612     case 0x08:
 613     case 0xD0:
 614     case 0x0D:
 615     case 0xDA:
 616         res = (DWORD)DMA_ioport_in( port );
 617         break;
 618     default:
 619         WARN("Direct I/O read attempted from port %x\n", port);
 620         break;
 621     }
 622     return res;
 623 }
 624
 625
 626 /**********************************************************************
 627  *          outport  (WINEDOS.@)
 628  */
 629 void WINAPI DOSVM_outport( int port, int size, DWORD value )
 630 {
 631     TRACE("IO: 0x%x (%d-byte value) to port 0x%04x\n", value, size, port );
 632
 633 #ifdef HAVE_PPDEV
 634     if (do_pp_port_access == -1) do_pp_port_access = IO_pp_init();
 635     if ((do_pp_port_access == 0) && (size == 1))
 636     {
 637         if (!IO_pp_outp(port,&value)) return;
 638     }
 639 #endif
 640
 641 #ifdef DIRECT_IO_ACCESS
 642
 643     if (do_direct_port_access == -1) IO_port_init();
 644     if ((do_direct_port_access)
 645         /* Make sure we have access to the port */
 646         && (port_permissions[port] & IO_WRITE))
 647     {
 648         iopl(3);
 649         switch(size)
 650         {
 651         case 1: outb( LOBYTE(value), port ); break;
 652         case 2: outw( LOWORD(value), port ); break;
 653         case 4: outl( value, port ); break;
 654         }
 655         iopl(0);
 656         return;
 657     }
 658 #endif
 659
 660     switch (port)
 661     {
 662     case 0x20:
 663         DOSVM_PIC_ioport_out( port, (BYTE)value );
 664         break;
 665     case 0x40:
 666     case 0x41:
 667     case 0x42:
 668         {
 669             BYTE chan = port & 3;
 670
 671             tmr_8253[chan].flags |= TMR_UPDATE;
 672             switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 673             {
 674             case 0:
 675                 break; /* shouldn't happen? */
 676             case 1: /* write lo byte */
 677                 tmr_8253[chan].countmax =
 678                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 679                 break;
 680             case 3: /* write lo byte, then hi byte */
 681                 tmr_8253[chan].flags ^= TMR_WTOGGLE; /* toggle */
 682                 if (tmr_8253[chan].flags & TMR_WTOGGLE)
 683                 {
 684                     tmr_8253[chan].countmax =
 685                         (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 686                     break;
 687                 }
 688                 /* else [fall through if write hi byte !] */
 689             case 2: /* write hi byte */
 690                 tmr_8253[chan].countmax =
 691                     (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 692                 break;
 693             }
 694             /* if programming is finished, update to new value */
 695             if ((tmr_8253[chan].ctrlbyte_ch & 0x30) &&
 696                 !(tmr_8253[chan].flags & TMR_WTOGGLE))
 697                 set_timer(chan);
 698         }
 699         break;
 700     case 0x43:
 701        {
 702            BYTE chan = ((BYTE)value & 0xc0) >> 6;
 703            /* ctrl byte for specific timer channel */
 704            if (chan == 3)
 705            {
 706                if ( !(value & 0x20) )
 707                {
 708                    if (value & 0x02 && !(tmr_8253[0].flags & TMR_LATCHED))
 709                    {
 710                        tmr_8253[0].flags |= TMR_LATCHED;
 711                        tmr_8253[0].latch = get_timer_val(0);
 712                    }
 713                    if (value & 0x04 && !(tmr_8253[1].flags & TMR_LATCHED))
 714                    {
 715                        tmr_8253[1].flags |= TMR_LATCHED;
 716                        tmr_8253[1].latch = get_timer_val(1);
 717                    }
 718                    if (value & 0x08 && !(tmr_8253[2].flags & TMR_LATCHED))
 719                    {
 720                        tmr_8253[2].flags |= TMR_LATCHED;
 721                        tmr_8253[2].latch = get_timer_val(2);
 722                    }
 723                }
 724
 725                if ( !(value & 0x10) )
 726                {
 727                    if (value & 0x02)
 728                        tmr_8253[0].flags |= TMR_STATUS;
 729                    if (value & 0x04)
 730                        tmr_8253[1].flags |= TMR_STATUS;
 731                    if (value & 0x08)
 732                        tmr_8253[2].flags |= TMR_STATUS;
 733                }
 734                break;
 735            }
 736            switch (((BYTE)value & 0x30) >> 4)
 737            {
 738            case 0:      /* latch timer */
 739                if ( !(tmr_8253[chan].flags & TMR_LATCHED) )
 740                {
 741                    tmr_8253[chan].flags |= TMR_LATCHED;
 742                    tmr_8253[chan].latch = get_timer_val(chan);
 743                }
 744                break;
 745            case 1:      /* write lo byte only */
 746            case 2:      /* write hi byte only */
 747            case 3:      /* write lo byte, then hi byte */
 748                tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 749                tmr_8253[chan].countmax = 0;
 750                tmr_8253[chan].flags = TMR_UPDATE;
 751                break;
 752            }
 753        }
 754        break;
 755     case 0x61:
 756         parport_8255[1] = (BYTE)value;
 757         if (((parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 758         {
 759             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 760             Beep(1193180 / tmr_8253[2].countmax, 20);
 761         }
 762         break;
 763     case 0x70:
 764         cmosaddress = (BYTE)value & 0x7f;
 765         break;
 766     case 0x71:
 767         if (!cmos_image_initialized)
 768         {
 769             IO_FixCMOSCheckSum();
 770             cmos_image_initialized = 1;
 771         }
 772         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 773         break;
 774     case 0x226:
 775     case 0x22c:
 776         SB_ioport_out( port, (BYTE)value );
 777         break;
 778     /* VGA Write registers */
 779     case 0x3b4:  /* CRT Controller Register - Index (MDA) */
 780     case 0x3b5:  /* CRT Controller Register - Other (MDA) */
 781     case 0x3ba:  /* General Register - Feature Control */
 782     case 0x3c0:  /* Attribute Controller - Address/Other */
 783     case 0x3c1:
 784     case 0x3c2:  /* General Register - Misc output */
 785     case 0x3c3:  /* General Register - Video subsystem enable */
 786     case 0x3c4:  /* Sequencer Register - Address */
 787     case 0x3c5:  /* Sequencer Register - Other */
 788     case 0x3c6:
 789     case 0x3c7:
 790     case 0x3c8:
 791     case 0x3c9:
 792     case 0x3ca:
 793     case 0x3cb:
 794     case 0x3cc:
 795     case 0x3cd:
 796     case 0x3ce:  /* Graphics Controller Register - Address */
 797     case 0x3cf:  /* Graphics Controller Register - Other */
 798     case 0x3d0:
 799     case 0x3d1:
 800     case 0x3d2:
 801     case 0x3d3:
 802     case 0x3d4:  /* CRT Controller Register - Index (CGA) */
 803     case 0x3d5:  /* CRT Controller Register - Other (CGA) */
 804     case 0x3d6:
 805     case 0x3d7:
 806     case 0x3d8:
 807     case 0x3d9:
 808     case 0x3da:
 809     case 0x3db:
 810     case 0x3dc:
 811     case 0x3dd:
 812     case 0x3de:
 813     case 0x3df:
 814         VGA_ioport_out( port, LOBYTE(value) );
 815         if(size > 1) {
 816             VGA_ioport_out( port+1, HIBYTE(value) );
 817             if(size > 2) {
 818                 VGA_ioport_out( port+2, LOBYTE(HIWORD(value)) );
 819                 VGA_ioport_out( port+3, HIBYTE(HIWORD(value)) );
 820             }
 821         }
 822         break;
 823     case 0x00:
 824     case 0x01:
 825     case 0x02:
 826     case 0x03:
 827     case 0x04:
 828     case 0x05:
 829     case 0x06:
 830     case 0x07:
 831     case 0xC0:
 832     case 0xC2:
 833     case 0xC4:
 834     case 0xC6:
 835     case 0xC8:
 836     case 0xCA:
 837     case 0xCC:
 838     case 0xCE:
 839     case 0x87:
 840     case 0x83:
 841     case 0x81:
 842     case 0x82:
 843     case 0x8B:
 844     case 0x89:
 845     case 0x8A:
 846     case 0x487:
 847     case 0x483:
 848     case 0x481:
 849     case 0x482:
 850     case 0x48B:
 851     case 0x489:
 852     case 0x48A:
 853     case 0x08:
 854     case 0xD0:
 855     case 0x0B:
 856     case 0xD6:
 857     case 0x0A:
 858     case 0xD4:
 859     case 0x0F:
 860     case 0xDE:
 861     case 0x09:
 862     case 0xD2:
 863     case 0x0C:
 864     case 0xD8:
 865     case 0x0D:
 866     case 0xDA:
 867     case 0x0E:
 868     case 0xDC:
 869         DMA_ioport_out( port, (BYTE)value );
 870         break;
 871     default:
 872         WARN("Direct I/O write attempted to port %x\n", port );
 873         break;
 874     }
 875 }