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