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 <string.h>
  17 #include <time.h>
  18 #include <unistd.h>
  19 #include "windows.h"
  20 #include "vga.h"
  21 #include "dosexe.h"
  22 #include "options.h"
  23 #include "debug.h"
  24
  25 static WORD tmr_8253_countmax[3] = {0xffff, 0x12, 1}; /* [2] needs to be 1 ! */
  26 /* if byte_toggle is TRUE, then hi byte has already been written */
  27 static BOOL16 tmr_8253_byte_toggle[3] = {FALSE, FALSE, FALSE};
  28 static WORD tmr_8253_latch[3] = {0, 0, 0};
  29
  30 /* 4th contents are dummy */
  31 static BOOL16 tmr_8253_latched[4] = {FALSE, FALSE, FALSE, FALSE};
  32 static BYTE tmr_8253_ctrlbyte_ch[4] = {0x06, 0x44, 0x86, 0};
  33
  34 static int dummy_ctr = 0;
  35
  36 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  37
  38 static BYTE cmosaddress;
  39
  40 static BYTE cmosimage[64] =
  41 {
  42   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  43   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  44   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  45   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  46   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  47   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
  48   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  49   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  50 };
  51
  52 #if defined(linux) && defined(__i386__)
  53 # define DIRECT_IO_ACCESS
  54 #else
  55 # undef DIRECT_IO_ACCESS
  56 #endif  /* linux && __i386__ */
  57
  58 #ifdef DIRECT_IO_ACCESS
  59
  60 extern int iopl(int level);
  61
  62 static char do_direct_port_access = 0;
  63 static char port_permissions[0x10000];
  64
  65 #define IO_READ  1
  66 #define IO_WRITE 2
  67
  68 #endif  /* DIRECT_IO_ACCESS */
  69
  70 static void IO_FixCMOSCheckSum(void)
  71 {
  72         WORD sum = 0;
  73         int i;
  74
  75         for (i=0x10; i < 0x2d; i++)
  76                 sum += cmosimage[i];
  77         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
  78         cmosimage[0x2f] = sum & 0xff;
  79         TRACE(int, "calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
  80 }
  81
  82 static void set_timer_maxval(unsigned timer, unsigned maxval)
  83 {
  84     switch (timer) {
  85         case 0: /* System timer counter divisor */
  86             DOSVM_SetTimer(maxval);
  87             break;
  88         case 1: /* RAM refresh */
  89             FIXME(int, "RAM refresh counter handling not implemented !");
  90             break;
  91         case 2: /* cassette & speaker */
  92             /* speaker on ? */
  93             if (((BYTE)parport_8255[1] & 3) == 3)
  94             {
  95                 TRACE(int, "Beep (freq: %d) !\n", 1193180 / maxval );
  96                 Beep(1193180 / maxval, 20);
  97             }
  98             break;
  99     }
 100 }
 101
 102 /**********************************************************************
 103  *          IO_port_init
 104  */
 105
 106 /* set_IO_permissions(int val1, int val)
 107  * Helper function for IO_port_init
 108  */
 109 #ifdef DIRECT_IO_ACCESS
 110 static void set_IO_permissions(int val1, int val, char rw)
 111 {
 112         int j;
 113         if (val1 != -1) {
 114                 if (val == -1) val = 0x3ff;
 115                 for (j = val1; j <= val; j++)
 116                         port_permissions[j] |= rw;
 117
 118                 do_direct_port_access = 1;
 119
 120                 val1 = -1;
 121         } else if (val != -1) {
 122                 do_direct_port_access = 1;
 123
 124                 port_permissions[val] |= rw;
 125         }
 126
 127 }
 128
 129 /* do_IO_port_init_read_or_write(char* temp, char rw)
 130  * Helper function for IO_port_init
 131  */
 132
 133 static void do_IO_port_init_read_or_write(char* temp, char rw)
 134 {
 135         int val, val1, i, len;
 136         if (!strcasecmp(temp, "all")) {
 137                 MSG("Warning!!! Granting FULL IO port access to"
 138                         " windoze programs!\nWarning!!! "
 139                         "*** THIS IS NOT AT ALL "
 140                         "RECOMMENDED!!! ***\n");
 141                 for (i=0; i < sizeof(port_permissions); i++)
 142                         port_permissions[i] |= rw;
 143
 144         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 145                 len = strlen(temp);
 146                 val = -1;
 147                 val1 = -1;
 148                 for (i = 0; i < len; i++) {
 149                         switch (temp[i]) {
 150                         case '0':
 151                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 152                                         sscanf(temp+i, "%x", &val);
 153                                         i += 2;
 154                                 } else {
 155                                         sscanf(temp+i, "%d", &val);
 156                                 }
 157                                 while (isxdigit(temp[i]))
 158                                         i++;
 159                                 i--;
 160                                 break;
 161                         case ',':
 162                         case ' ':
 163                         case '\t':
 164                                 set_IO_permissions(val1, val, rw);
 165                                 val1 = -1; val = -1;
 166                                 break;
 167                         case '-':
 168                                 val1 = val;
 169                                 if (val1 == -1) val1 = 0;
 170                                 break;
 171                         default:
 172                                 if (temp[i] >= '0' && temp[i] <= '9') {
 173                                         sscanf(temp+i, "%d", &val);
 174                                         while (isdigit(temp[i]))
 175                                                 i++;
 176                                 }
 177                         }
 178                 }
 179                 set_IO_permissions(val1, val, rw);
 180         }
 181 }
 182
 183 static __inline__ BYTE inb( WORD port )
 184 {
 185     BYTE b;
 186     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 187     return b;
 188 }
 189
 190 static __inline__ WORD inw( WORD port )
 191 {
 192     WORD w;
 193     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 194     return w;
 195 }
 196
 197 static __inline__ DWORD inl( WORD port )
 198 {
 199     DWORD dw;
 200     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 201     return dw;
 202 }
 203
 204 static __inline__ void outb( BYTE value, WORD port )
 205 {
 206     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 207 }
 208
 209 static __inline__ void outw( WORD value, WORD port )
 210 {
 211     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 212 }
 213
 214 static __inline__ void outl( DWORD value, WORD port )
 215 {
 216     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 217 }
 218
 219 #endif  /* DIRECT_IO_ACCESS */
 220
 221 void IO_port_init()
 222 {
 223 #ifdef DIRECT_IO_ACCESS
 224         char temp[1024];
 225
 226         /* Can we do that? */
 227         if (!iopl(3)) {
 228                 iopl(0);
 229
 230                 PROFILE_GetWineIniString( "ports", "read", "*",
 231                                          temp, sizeof(temp) );
 232                 do_IO_port_init_read_or_write(temp, IO_READ);
 233                 PROFILE_GetWineIniString( "ports", "write", "*",
 234                                          temp, sizeof(temp) );
 235                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 236         }
 237 #endif  /* DIRECT_IO_ACCESS */
 238     IO_FixCMOSCheckSum();
 239 }
 240
 241
 242 /**********************************************************************
 243  *          IO_inport
 244  *
 245  * Note: The size argument has to be handled correctly _externally_
 246  * (as we always return a DWORD)
 247  */
 248 DWORD IO_inport( int port, int size )
 249 {
 250     DWORD res = 0;
 251
 252     TRACE(int, "%d-byte value from port 0x%02x\n", size, port );
 253
 254 #ifdef DIRECT_IO_ACCESS
 255     if ((do_direct_port_access)
 256         /* Make sure we have access to the port */
 257         && (port_permissions[port] & IO_READ))
 258     {
 259         iopl(3);
 260         switch(size)
 261         {
 262         case 1: res = inb( port ); break;
 263         case 2: res = inw( port ); break;
 264         case 4: res = inl( port ); break;
 265         default:
 266             ERR(int, "invalid data size %d\n", size);
 267         }
 268         iopl(0);
 269         return res;
 270     }
 271 #endif
 272
 273     switch (port)
 274     {
 275     case 0x3ba:
 276     case 0x3da:
 277         res = (DWORD)VGA_ioport_in( port );
 278         break;
 279     case 0x40:
 280     case 0x41:
 281     case 0x42:
 282     {
 283         BYTE chan = port & 3;
 284         WORD tempval = 0;
 285
 286         if (tmr_8253_latched[chan] == TRUE)
 287         {
 288             tempval = tmr_8253_latch[chan];
 289             tmr_8253_latched[chan] = FALSE;
 290         }
 291         else
 292         {
 293             dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
 294         if (chan == 0) /* System timer counter divisor */
 295                 /* FIXME: DOSVM_GetTimer() returns quite rigid values */
 296                                 tempval = dummy_ctr+(WORD)DOSVM_GetTimer();
 297         else
 298         {   /* FIXME: intelligent hardware timer emulation needed */
 299             tempval = dummy_ctr;
 300         }
 301         }
 302         switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
 303         {
 304         case 0x00:
 305             break; /* correct ? */
 306         case 0x10: /* read lo byte */
 307             res = (BYTE)tempval;
 308             break;
 309         case 0x30: /* read lo byte, then hi byte */
 310             tmr_8253_byte_toggle[chan] ^= TRUE; /* toggle */
 311             if (tmr_8253_byte_toggle[chan] == TRUE)
 312             {
 313                 res = (BYTE)tempval;
 314                 break;
 315             }
 316             /* else [fall through if read hi byte !] */
 317         case 0x20: /* read hi byte */
 318             res = (BYTE)tempval>>8;
 319             break;
 320         }
 321         break;
 322     }
 323     case 0x60:
 324         res = (DWORD)parport_8255[0];
 325         break;
 326     case 0x61:
 327         res = (DWORD)parport_8255[1];
 328         break;
 329     case 0x62:
 330         res = (DWORD)parport_8255[2];
 331         break;
 332     case 0x70:
 333         res = (DWORD)cmosaddress;
 334         break;
 335     case 0x71:
 336         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 337         break;
 338     case 0x200:
 339     case 0x201:
 340         res = 0xffffffff; /* no joystick */
 341         break;
 342     default:
 343         WARN( int, "Direct I/O read attempted from port %x\n", port);
 344         res = 0xffffffff;
 345         break;
 346     }
 347     TRACE(int, "  returning ( 0x%lx )\n", res );
 348     return res;
 349 }
 350
 351
 352 /**********************************************************************
 353  *          IO_outport
 354  */
 355 void IO_outport( int port, int size, DWORD value )
 356 {
 357     TRACE(int, "IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 358                  value, size, port );
 359
 360 #ifdef DIRECT_IO_ACCESS
 361     if ((do_direct_port_access)
 362         /* Make sure we have access to the port */
 363         && (port_permissions[port] & IO_WRITE))
 364     {
 365         iopl(3);
 366         switch(size)
 367         {
 368         case 1: outb( LOBYTE(value), port ); break;
 369         case 2: outw( LOWORD(value), port ); break;
 370         case 4: outl( value, port ); break;
 371         default:
 372             WARN(int, "Invalid data size %d\n", size);
 373         }
 374         iopl(0);
 375         return;
 376     }
 377 #endif
 378
 379     switch (port)
 380     {
 381     case 0x3c8:
 382     case 0x3c9:
 383         VGA_ioport_out( port, (BYTE)value );
 384         break;
 385     case 0x40:
 386     case 0x41:
 387     case 0x42:
 388     {
 389         BYTE chan = port & 3;
 390         WORD oldval = 0;
 391
 392         if ( ((tmr_8253_ctrlbyte_ch[chan] & 0x30) != 0x30) ||
 393 /* we need to get the oldval before any lo/hi byte change has been made */
 394              (tmr_8253_byte_toggle[chan] == FALSE) )
 395             oldval = tmr_8253_countmax[chan];
 396         switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
 397         {
 398         case 0x00:
 399             break; /* correct ? */
 400         case 0x10: /* write lo byte */
 401             tmr_8253_countmax[chan] =
 402                 (tmr_8253_countmax[chan] & 0xff00) | (BYTE)value;
 403             break;
 404         case 0x30: /* write lo byte, then hi byte */
 405             tmr_8253_byte_toggle[chan] ^= TRUE; /* toggle */
 406             if (tmr_8253_byte_toggle[chan] == TRUE)
 407             {
 408                 tmr_8253_countmax[chan] =
 409                     (tmr_8253_countmax[chan] & 0xff00) | (BYTE)value;
 410                 break;
 411             }
 412             /* else [fall through if write hi byte !] */
 413         case 0x20: /* write hi byte */
 414             tmr_8253_countmax[chan] =
 415                 (tmr_8253_countmax[chan] & 0xff)|((BYTE)value << 8);
 416             break;
 417         }
 418         if (
 419             /* programming finished ? */
 420             ( ((tmr_8253_ctrlbyte_ch[chan] & 0x30) != 0x30) ||
 421               (tmr_8253_byte_toggle[chan] == FALSE) )
 422             /* update to new value ? */
 423             && (tmr_8253_countmax[chan] != oldval)
 424             )
 425             set_timer_maxval(chan, tmr_8253_countmax[chan]);
 426     }
 427     break;
 428     case 0x43:
 429         {
 430           BYTE chan = ((BYTE)value & 0xc0) >> 6;
 431
 432         /* ctrl byte for specific timer channel */
 433           tmr_8253_ctrlbyte_ch[chan] = (BYTE)value;
 434           if (chan == 3) {
 435             FIXME(int,"8254 timer readback not implemented yet\n");
 436             }
 437           else
 438           if (((BYTE)value&0x30)==0) { /* latch timer */
 439             tmr_8253_latched[chan] = TRUE;
 440             dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
 441             if (chan == 0) /* System timer divisor */
 442               tmr_8253_latch[0] = dummy_ctr+(WORD)DOSVM_GetTimer();
 443             else
 444             {   /* FIXME: intelligent hardware timer emulation needed */
 445               tmr_8253_latch[chan] = dummy_ctr;
 446             }
 447           }
 448         if ((value & 0x30) == 0x30) /* write lo byte, then hi byte */
 449             tmr_8253_byte_toggle[((BYTE)value & 0xc0) >> 6] = FALSE; /* init */
 450         }
 451         break;
 452     case 0x61:
 453         parport_8255[1] = (BYTE)value;
 454         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253_countmax[2] != 1))
 455         {
 456             TRACE(int, "Beep (freq: %d) !\n", 1193180 / tmr_8253_countmax[2]);
 457             Beep(1193180 / tmr_8253_countmax[2], 20);
 458         }
 459         break;
 460     case 0x70:
 461         cmosaddress = (BYTE)value & 0x7f;
 462         break;
 463     case 0x71:
 464         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 465         break;
 466     default:
 467         WARN(int, "Direct I/O write attempted to port %x\n", port );
 468         break;
 469     }
 470 }