msdos/ioports.c

   1 /*
   2  * Emulation of processor ioports.
   3  *
   4  * Copyright 1995 Morten Welinder
   5  * Copyright 1998 Andreas Mohr, Ove Kaaven
   6  */
   7
   8 /* Known problems:
   9    - only a few ports are emulated.
  10    - real-time clock in "cmos" is bogus.  A nifty alarm() setup could
  11      fix that, I guess.
  12 */
  13
  14 #include "config.h"
  15
  16 #include <ctype.h>
  17 #include <stdlib.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include "windef.h"
  23 #include "vga.h"
  24 #include "callback.h"
  25 #include "dosexe.h"
  26 #include "options.h"
  27 #include "miscemu.h"
  28 #include "debugtools.h"
  29
  30 DEFAULT_DEBUG_CHANNEL(int);
  31
  32 static struct {
  33     WORD        countmax;
  34     BOOL16      byte_toggle; /* if TRUE, then hi byte has already been written */
  35     WORD        latch;
  36     BOOL16      latched;
  37     BYTE        ctrlbyte_ch;
  38     WORD        oldval;
  39 } tmr_8253[3] = {
  40     {0xFFFF,    FALSE,  0,      FALSE,  0x06,   0},
  41     {0x0012,    FALSE,  0,      FALSE,  0x44,   0},
  42     {0x0001,    FALSE,  0,      FALSE,  0x86,   0},
  43 };
  44
  45 static int dummy_ctr = 0;
  46
  47 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  48
  49 static BYTE cmosaddress;
  50
  51 static BYTE cmosimage[64] =
  52 {
  53   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  54   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  55   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  56   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  57   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  58   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
  59   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  60   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  61 };
  62
  63 #if defined(linux) && defined(__i386__)
  64 # define DIRECT_IO_ACCESS
  65 #else
  66 # undef DIRECT_IO_ACCESS
  67 # undef PP_IO_ACCESS
  68 #endif  /* linux && __i386__ */
  69
  70 #ifdef DIRECT_IO_ACCESS
  71
  72 extern int iopl(int level);
  73 static char do_direct_port_access = -1;
  74 #ifdef HAVE_PPDEV
  75 static char do_pp_port_access = -1; /* -1: uninitialized, 1: not available
  76                                        0: available);*/
  77 #endif
  78 static char port_permissions[0x10000];
  79
  80 #define IO_READ  1
  81 #define IO_WRITE 2
  82
  83 static void IO_FixCMOSCheckSum(void)
  84 {
  85         WORD sum = 0;
  86         int i;
  87
  88         for (i=0x10; i < 0x2d; i++)
  89                 sum += cmosimage[i];
  90         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
  91         cmosimage[0x2f] = sum & 0xff;
  92         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
  93 }
  94
  95 #endif  /* DIRECT_IO_ACCESS */
  96
  97 static void set_timer_maxval(unsigned timer, unsigned maxval)
  98 {
  99     switch (timer) {
 100         case 0: /* System timer counter divisor */
 101             Dosvm.SetTimer(maxval);
 102             break;
 103         case 1: /* RAM refresh */
 104             FIXME("RAM refresh counter handling not implemented !\n");
 105             break;
 106         case 2: /* cassette & speaker */
 107             /* speaker on ? */
 108             if (((BYTE)parport_8255[1] & 3) == 3)
 109             {
 110                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
 111                 Beep(1193180 / maxval, 20);
 112             }
 113             break;
 114     }
 115 }
 116
 117 /**********************************************************************
 118  *          IO_port_init
 119  */
 120
 121 /* set_IO_permissions(int val1, int val)
 122  * Helper function for IO_port_init
 123  */
 124 #ifdef DIRECT_IO_ACCESS
 125 static void set_IO_permissions(int val1, int val, char rw)
 126 {
 127         int j;
 128         if (val1 != -1) {
 129                 if (val == -1) val = 0x3ff;
 130                 for (j = val1; j <= val; j++)
 131                         port_permissions[j] |= rw;
 132
 133                 do_direct_port_access = 1;
 134
 135                 val1 = -1;
 136         } else if (val != -1) {
 137                 do_direct_port_access = 1;
 138
 139                 port_permissions[val] |= rw;
 140         }
 141
 142 }
 143
 144 /* do_IO_port_init_read_or_write(char* temp, char rw)
 145  * Helper function for IO_port_init
 146  */
 147
 148 static void do_IO_port_init_read_or_write(char* temp, char rw)
 149 {
 150         int val, val1, i, len;
 151         if (!strcasecmp(temp, "all")) {
 152                 MESSAGE("Warning!!! Granting FULL IO port access to"
 153                         " windoze programs!\nWarning!!! "
 154                         "*** THIS IS NOT AT ALL "
 155                         "RECOMMENDED!!! ***\n");
 156                 for (i=0; i < sizeof(port_permissions); i++)
 157                         port_permissions[i] |= rw;
 158
 159         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 160                 len = strlen(temp);
 161                 val = -1;
 162                 val1 = -1;
 163                 for (i = 0; i < len; i++) {
 164                         switch (temp[i]) {
 165                         case '0':
 166                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 167                                         sscanf(temp+i, "%x", &val);
 168                                         i += 2;
 169                                 } else {
 170                                         sscanf(temp+i, "%d", &val);
 171                                 }
 172                                 while (isxdigit(temp[i]))
 173                                         i++;
 174                                 i--;
 175                                 break;
 176                         case ',':
 177                         case ' ':
 178                         case '\t':
 179                                 set_IO_permissions(val1, val, rw);
 180                                 val1 = -1; val = -1;
 181                                 break;
 182                         case '-':
 183                                 val1 = val;
 184                                 if (val1 == -1) val1 = 0;
 185                                 break;
 186                         default:
 187                                 if (temp[i] >= '0' && temp[i] <= '9') {
 188                                         sscanf(temp+i, "%d", &val);
 189                                         while (isdigit(temp[i]))
 190                                                 i++;
 191                                 }
 192                         }
 193                 }
 194                 set_IO_permissions(val1, val, rw);
 195         }
 196 }
 197
 198 static inline BYTE inb( WORD port )
 199 {
 200     BYTE b;
 201     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 202     return b;
 203 }
 204
 205 static inline WORD inw( WORD port )
 206 {
 207     WORD w;
 208     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 209     return w;
 210 }
 211
 212 static inline DWORD inl( WORD port )
 213 {
 214     DWORD dw;
 215     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 216     return dw;
 217 }
 218
 219 static inline void outb( BYTE value, WORD port )
 220 {
 221     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 222 }
 223
 224 static inline void outw( WORD value, WORD port )
 225 {
 226     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 227 }
 228
 229 static inline void outl( DWORD value, WORD port )
 230 {
 231     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 232 }
 233
 234 static void IO_port_init(void)
 235 {
 236         char temp[1024];
 237
 238         do_direct_port_access = 0;
 239         /* Can we do that? */
 240         if (!iopl(3)) {
 241                 iopl(0);
 242
 243                 PROFILE_GetWineIniString( "ports", "read", "*",
 244                                          temp, sizeof(temp) );
 245                 do_IO_port_init_read_or_write(temp, IO_READ);
 246                 PROFILE_GetWineIniString( "ports", "write", "*",
 247                                          temp, sizeof(temp) );
 248                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 249         }
 250     IO_FixCMOSCheckSum();
 251 }
 252
 253 #endif  /* DIRECT_IO_ACCESS */
 254
 255 /**********************************************************************
 256  *          IO_inport
 257  *
 258  * Note: The size argument has to be handled correctly _externally_
 259  * (as we always return a DWORD)
 260  */
 261 DWORD IO_inport( int port, int size )
 262 {
 263     DWORD res = 0;
 264
 265     TRACE("%d-byte value from port 0x%02x\n", size, port );
 266
 267 #ifdef HAVE_PPDEV
 268     if (do_pp_port_access == -1)
 269       do_pp_port_access =IO_pp_init();
 270     if ((do_pp_port_access == 0 ) && (size == 1))
 271       if (!IO_pp_inp(port,&res))
 272          return res;
 273 #endif
 274 #ifdef DIRECT_IO_ACCESS
 275     if (do_direct_port_access == -1) IO_port_init();
 276     if ((do_direct_port_access)
 277         /* Make sure we have access to the port */
 278         && (port_permissions[port] & IO_READ))
 279     {
 280         iopl(3);
 281         switch(size)
 282         {
 283         case 1: res = inb( port ); break;
 284         case 2: res = inw( port ); break;
 285         case 4: res = inl( port ); break;
 286         default:
 287             ERR("invalid data size %d\n", size);
 288         }
 289         iopl(0);
 290         return res;
 291     }
 292 #endif
 293
 294     switch (port)
 295     {
 296     case 0x40:
 297     case 0x41:
 298     case 0x42:
 299     {
 300         BYTE chan = port & 3;
 301         WORD tempval = 0;
 302         if (tmr_8253[chan].latched)
 303             tempval = tmr_8253[chan].latch;
 304         else
 305         {
 306             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 307             if (chan == 0) /* System timer counter divisor */
 308             {
 309                 /* FIXME: Dosvm.GetTimer() returns quite rigid values */
 310                 tempval = dummy_ctr + (WORD)Dosvm.GetTimer();
 311             }
 312             else
 313             {
 314                 /* FIXME: intelligent hardware timer emulation needed */
 315                 tempval = dummy_ctr;
 316             }
 317         }
 318
 319         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 320         {
 321         case 0:
 322             res = 0; /* shouldn't happen? */
 323             break;
 324         case 1: /* read lo byte */
 325             res = (BYTE)tempval;
 326             tmr_8253[chan].latched = FALSE;
 327             break;
 328         case 3: /* read lo byte, then hi byte */
 329             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 330             if (tmr_8253[chan].byte_toggle)
 331             {
 332                 res = (BYTE)tempval;
 333                 break;
 334             }
 335             /* else [fall through if read hi byte !] */
 336         case 2: /* read hi byte */
 337             res = (BYTE)(tempval >> 8);
 338             tmr_8253[chan].latched = FALSE;
 339             break;
 340         }
 341     }
 342     break;
 343     case 0x60:
 344         res = INT_Int09ReadScan(NULL);
 345 #if 0 /* what's this port got to do with parport ? */
 346         res = (DWORD)parport_8255[0];
 347 #endif
 348         break;
 349     case 0x61:
 350         res = (DWORD)parport_8255[1];
 351         break;
 352     case 0x62:
 353         res = (DWORD)parport_8255[2];
 354         break;
 355     case 0x70:
 356         res = (DWORD)cmosaddress;
 357         break;
 358     case 0x71:
 359         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 360         break;
 361     case 0x200:
 362     case 0x201:
 363         res = 0xffffffff; /* no joystick */
 364         break;
 365     case 0x3ba:
 366     case 0x3da:
 367         res = (DWORD)VGA_ioport_in( port );
 368         break;
 369     default:
 370         WARN("Direct I/O read attempted from port %x\n", port);
 371         res = 0xffffffff;
 372         break;
 373     }
 374     TRACE("  returning ( 0x%lx )\n", res );
 375     return res;
 376 }
 377
 378
 379 /**********************************************************************
 380  *          IO_outport
 381  */
 382 void IO_outport( int port, int size, DWORD value )
 383 {
 384     TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 385                  value, size, port );
 386
 387 #ifdef HAVE_PPDEV
 388     if (do_pp_port_access == -1)
 389       do_pp_port_access = IO_pp_init();
 390     if ((do_pp_port_access == 0) && (size == 1))
 391       if (!IO_pp_outp(port,&value))
 392          return;
 393 #endif
 394 #ifdef DIRECT_IO_ACCESS
 395
 396     if (do_direct_port_access == -1) IO_port_init();
 397     if ((do_direct_port_access)
 398         /* Make sure we have access to the port */
 399         && (port_permissions[port] & IO_WRITE))
 400     {
 401         iopl(3);
 402         switch(size)
 403         {
 404         case 1: outb( LOBYTE(value), port ); break;
 405         case 2: outw( LOWORD(value), port ); break;
 406         case 4: outl( value, port ); break;
 407         default:
 408             WARN("Invalid data size %d\n", size);
 409         }
 410         iopl(0);
 411         return;
 412     }
 413 #endif
 414
 415     switch (port)
 416     {
 417     case 0x20:
 418         Dosvm.OutPIC( port, (BYTE)value );
 419         break;
 420     case 0x40:
 421     case 0x41:
 422     case 0x42:
 423     {
 424         BYTE chan = port & 3;
 425
 426         /* we need to get the oldval before any lo/hi byte change has been made */
 427         if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 428             !tmr_8253[chan].byte_toggle)
 429             tmr_8253[chan].oldval = tmr_8253[chan].countmax;
 430         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 431         {
 432         case 0:
 433             break; /* shouldn't happen? */
 434         case 1: /* write lo byte */
 435             tmr_8253[chan].countmax =
 436                 (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 437             break;
 438         case 3: /* write lo byte, then hi byte */
 439             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 440             if (tmr_8253[chan].byte_toggle)
 441             {
 442                 tmr_8253[chan].countmax =
 443                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 444                 break;
 445             }
 446             /* else [fall through if write hi byte !] */
 447         case 2: /* write hi byte */
 448             tmr_8253[chan].countmax =
 449                 (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 450             break;
 451         }
 452         /* if programming is finished and value has changed
 453            then update to new value */
 454         if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 455              !tmr_8253[chan].byte_toggle) &&
 456             (tmr_8253[chan].countmax != tmr_8253[chan].oldval))
 457             set_timer_maxval(chan, tmr_8253[chan].countmax);
 458     }
 459     break;
 460     case 0x43:
 461     {
 462         BYTE chan = ((BYTE)value & 0xc0) >> 6;
 463         /* ctrl byte for specific timer channel */
 464         if (chan == 3)
 465         {
 466             FIXME("8254 timer readback not implemented yet\n");
 467             break;
 468         }
 469         switch (((BYTE)value & 0x30) >> 4)
 470         {
 471         case 0: /* latch timer */
 472             tmr_8253[chan].latched = TRUE;
 473             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 474             if (chan == 0) /* System timer divisor */
 475                 tmr_8253[chan].latch = dummy_ctr + (WORD)Dosvm.GetTimer();
 476             else
 477             {
 478                 /* FIXME: intelligent hardware timer emulation needed */
 479                 tmr_8253[chan].latch = dummy_ctr;
 480             }
 481             break;
 482         case 3: /* write lo byte, then hi byte */
 483             tmr_8253[chan].byte_toggle = FALSE; /* init */
 484             /* fall through */
 485         case 1: /* write lo byte only */
 486         case 2: /* write hi byte only */
 487             tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 488             break;
 489         }
 490     }
 491     break;
 492     case 0x61:
 493         parport_8255[1] = (BYTE)value;
 494         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 495         {
 496             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 497             Beep(1193180 / tmr_8253[2].countmax, 20);
 498         }
 499         break;
 500     case 0x70:
 501         cmosaddress = (BYTE)value & 0x7f;
 502         break;
 503     case 0x71:
 504         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 505         break;
 506     case 0x3c8:
 507     case 0x3c9:
 508         VGA_ioport_out( port, (BYTE)value );
 509         break;
 510     default:
 511         WARN("Direct I/O write attempted to port %x\n", port );
 512         break;
 513     }
 514 }