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