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 "windef.h"
  20 #include "vga.h"
  21 #include "dosexe.h"
  22 #include "options.h"
  23 #include "miscemu.h"
  24 #include "debugtools.h"
  25
  26 DEFAULT_DEBUG_CHANNEL(int)
  27
  28 static WORD tmr_8253_countmax[3] = {0xffff, 0x12, 1}; /* [2] needs to be 1 ! */
  29 /* if byte_toggle is TRUE, then hi byte has already been written */
  30 static BOOL16 tmr_8253_byte_toggle[3] = {FALSE, FALSE, FALSE};
  31 static WORD tmr_8253_latch[3] = {0, 0, 0};
  32
  33 /* 4th contents are dummy */
  34 static BOOL16 tmr_8253_latched[4] = {FALSE, FALSE, FALSE, FALSE};
  35 static BYTE tmr_8253_ctrlbyte_ch[4] = {0x06, 0x44, 0x86, 0};
  36
  37 static int dummy_ctr = 0;
  38
  39 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  40
  41 static BYTE cmosaddress;
  42
  43 static BYTE cmosimage[64] =
  44 {
  45   0x27, 0x34, 0x31, 0x47, 0x16, 0x15, 0x00, 0x01,
  46   0x04, 0x94, 0x26, 0x02, 0x50, 0x80, 0x00, 0x00,
  47   0x40, 0xb1, 0x00, 0x9c, 0x01, 0x80, 0x02, 0x00,
  48   0x1c, 0x00, 0x00, 0xad, 0x02, 0x10, 0x00, 0x00,
  49   0x08, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00,
  50   0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0x03, 0x19,
  51   0x00, 0x1c, 0x19, 0x81, 0x00, 0x0e, 0x00, 0x80,
  52   0x1b, 0x7b, 0x21, 0x00, 0x00, 0x00, 0x05, 0x5f
  53 };
  54
  55 #if defined(linux) && defined(__i386__)
  56 # define DIRECT_IO_ACCESS
  57 #else
  58 # undef DIRECT_IO_ACCESS
  59 #endif  /* linux && __i386__ */
  60
  61 #ifdef DIRECT_IO_ACCESS
  62
  63 extern int iopl(int level);
  64
  65 static char do_direct_port_access = 0;
  66 static char port_permissions[0x10000];
  67
  68 #define IO_READ  1
  69 #define IO_WRITE 2
  70
  71 #endif  /* DIRECT_IO_ACCESS */
  72
  73 static void IO_FixCMOSCheckSum(void)
  74 {
  75         WORD sum = 0;
  76         int i;
  77
  78         for (i=0x10; i < 0x2d; i++)
  79                 sum += cmosimage[i];
  80         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
  81         cmosimage[0x2f] = sum & 0xff;
  82         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
  83 }
  84
  85 static void set_timer_maxval(unsigned timer, unsigned maxval)
  86 {
  87     switch (timer) {
  88         case 0: /* System timer counter divisor */
  89             DOSVM_SetTimer(maxval);
  90             break;
  91         case 1: /* RAM refresh */
  92             FIXME("RAM refresh counter handling not implemented !");
  93             break;
  94         case 2: /* cassette & speaker */
  95             /* speaker on ? */
  96             if (((BYTE)parport_8255[1] & 3) == 3)
  97             {
  98                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
  99                 Beep(1193180 / maxval, 20);
 100             }
 101             break;
 102     }
 103 }
 104
 105 /**********************************************************************
 106  *          IO_port_init
 107  */
 108
 109 /* set_IO_permissions(int val1, int val)
 110  * Helper function for IO_port_init
 111  */
 112 #ifdef DIRECT_IO_ACCESS
 113 static void set_IO_permissions(int val1, int val, char rw)
 114 {
 115         int j;
 116         if (val1 != -1) {
 117                 if (val == -1) val = 0x3ff;
 118                 for (j = val1; j <= val; j++)
 119                         port_permissions[j] |= rw;
 120
 121                 do_direct_port_access = 1;
 122
 123                 val1 = -1;
 124         } else if (val != -1) {
 125                 do_direct_port_access = 1;
 126
 127                 port_permissions[val] |= rw;
 128         }
 129
 130 }
 131
 132 /* do_IO_port_init_read_or_write(char* temp, char rw)
 133  * Helper function for IO_port_init
 134  */
 135
 136 static void do_IO_port_init_read_or_write(char* temp, char rw)
 137 {
 138         int val, val1, i, len;
 139         if (!strcasecmp(temp, "all")) {
 140                 MESSAGE("Warning!!! Granting FULL IO port access to"
 141                         " windoze programs!\nWarning!!! "
 142                         "*** THIS IS NOT AT ALL "
 143                         "RECOMMENDED!!! ***\n");
 144                 for (i=0; i < sizeof(port_permissions); i++)
 145                         port_permissions[i] |= rw;
 146
 147         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 148                 len = strlen(temp);
 149                 val = -1;
 150                 val1 = -1;
 151                 for (i = 0; i < len; i++) {
 152                         switch (temp[i]) {
 153                         case '0':
 154                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 155                                         sscanf(temp+i, "%x", &val);
 156                                         i += 2;
 157                                 } else {
 158                                         sscanf(temp+i, "%d", &val);
 159                                 }
 160                                 while (isxdigit(temp[i]))
 161                                         i++;
 162                                 i--;
 163                                 break;
 164                         case ',':
 165                         case ' ':
 166                         case '\t':
 167                                 set_IO_permissions(val1, val, rw);
 168                                 val1 = -1; val = -1;
 169                                 break;
 170                         case '-':
 171                                 val1 = val;
 172                                 if (val1 == -1) val1 = 0;
 173                                 break;
 174                         default:
 175                                 if (temp[i] >= '0' && temp[i] <= '9') {
 176                                         sscanf(temp+i, "%d", &val);
 177                                         while (isdigit(temp[i]))
 178                                                 i++;
 179                                 }
 180                         }
 181                 }
 182                 set_IO_permissions(val1, val, rw);
 183         }
 184 }
 185
 186 static inline BYTE inb( WORD port )
 187 {
 188     BYTE b;
 189     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 190     return b;
 191 }
 192
 193 static inline WORD inw( WORD port )
 194 {
 195     WORD w;
 196     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 197     return w;
 198 }
 199
 200 static inline DWORD inl( WORD port )
 201 {
 202     DWORD dw;
 203     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 204     return dw;
 205 }
 206
 207 static inline void outb( BYTE value, WORD port )
 208 {
 209     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 210 }
 211
 212 static inline void outw( WORD value, WORD port )
 213 {
 214     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 215 }
 216
 217 static inline void outl( DWORD value, WORD port )
 218 {
 219     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 220 }
 221
 222 #endif  /* DIRECT_IO_ACCESS */
 223
 224 void IO_port_init()
 225 {
 226 #ifdef DIRECT_IO_ACCESS
 227         char temp[1024];
 228
 229         /* Can we do that? */
 230         if (!iopl(3)) {
 231                 iopl(0);
 232
 233                 PROFILE_GetWineIniString( "ports", "read", "*",
 234                                          temp, sizeof(temp) );
 235                 do_IO_port_init_read_or_write(temp, IO_READ);
 236                 PROFILE_GetWineIniString( "ports", "write", "*",
 237                                          temp, sizeof(temp) );
 238                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 239         }
 240 #endif  /* DIRECT_IO_ACCESS */
 241     IO_FixCMOSCheckSum();
 242 }
 243
 244
 245 /**********************************************************************
 246  *          IO_inport
 247  *
 248  * Note: The size argument has to be handled correctly _externally_
 249  * (as we always return a DWORD)
 250  */
 251 DWORD IO_inport( int port, int size )
 252 {
 253     DWORD res = 0;
 254
 255     TRACE("%d-byte value from port 0x%02x\n", size, port );
 256
 257 #ifdef DIRECT_IO_ACCESS
 258     if ((do_direct_port_access)
 259         /* Make sure we have access to the port */
 260         && (port_permissions[port] & IO_READ))
 261     {
 262         iopl(3);
 263         switch(size)
 264         {
 265         case 1: res = inb( port ); break;
 266         case 2: res = inw( port ); break;
 267         case 4: res = inl( port ); break;
 268         default:
 269             ERR("invalid data size %d\n", size);
 270         }
 271         iopl(0);
 272         return res;
 273     }
 274 #endif
 275
 276     switch (port)
 277     {
 278     case 0x3ba:
 279     case 0x3da:
 280         res = (DWORD)VGA_ioport_in( port );
 281         break;
 282     case 0x40:
 283     case 0x41:
 284     case 0x42:
 285     {
 286         BYTE chan = port & 3;
 287         WORD tempval = 0;
 288
 289         if (tmr_8253_latched[chan] == TRUE)
 290         {
 291             tempval = tmr_8253_latch[chan];
 292             tmr_8253_latched[chan] = FALSE;
 293         }
 294         else
 295         {
 296             dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
 297         if (chan == 0) /* System timer counter divisor */
 298                 /* FIXME: DOSVM_GetTimer() returns quite rigid values */
 299                                 tempval = dummy_ctr+(WORD)DOSVM_GetTimer();
 300         else
 301         {   /* FIXME: intelligent hardware timer emulation needed */
 302             tempval = dummy_ctr;
 303         }
 304         }
 305         switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
 306         {
 307         case 0x00:
 308             break; /* correct ? */
 309         case 0x10: /* read lo byte */
 310             res = (BYTE)tempval;
 311             break;
 312         case 0x30: /* read lo byte, then hi byte */
 313             tmr_8253_byte_toggle[chan] ^= TRUE; /* toggle */
 314             if (tmr_8253_byte_toggle[chan] == TRUE)
 315             {
 316                 res = (BYTE)tempval;
 317                 break;
 318             }
 319             /* else [fall through if read hi byte !] */
 320         case 0x20: /* read hi byte */
 321             res = (BYTE)tempval>>8;
 322             break;
 323         }
 324         break;
 325     }
 326     case 0x60:
 327         res = INT_Int09ReadScan();
 328 #if 0 /* what's this port got to do with parport ? */
 329         res = (DWORD)parport_8255[0];
 330 #endif
 331         break;
 332     case 0x61:
 333         res = (DWORD)parport_8255[1];
 334         break;
 335     case 0x62:
 336         res = (DWORD)parport_8255[2];
 337         break;
 338     case 0x70:
 339         res = (DWORD)cmosaddress;
 340         break;
 341     case 0x71:
 342         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 343         break;
 344     case 0x200:
 345     case 0x201:
 346         res = 0xffffffff; /* no joystick */
 347         break;
 348     default:
 349         WARN("Direct I/O read attempted from port %x\n", port);
 350         res = 0xffffffff;
 351         break;
 352     }
 353     TRACE("  returning ( 0x%lx )\n", res );
 354     return res;
 355 }
 356
 357
 358 /**********************************************************************
 359  *          IO_outport
 360  */
 361 void IO_outport( int port, int size, DWORD value )
 362 {
 363     TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 364                  value, size, port );
 365
 366 #ifdef DIRECT_IO_ACCESS
 367     if ((do_direct_port_access)
 368         /* Make sure we have access to the port */
 369         && (port_permissions[port] & IO_WRITE))
 370     {
 371         iopl(3);
 372         switch(size)
 373         {
 374         case 1: outb( LOBYTE(value), port ); break;
 375         case 2: outw( LOWORD(value), port ); break;
 376         case 4: outl( value, port ); break;
 377         default:
 378             WARN("Invalid data size %d\n", size);
 379         }
 380         iopl(0);
 381         return;
 382     }
 383 #endif
 384
 385     switch (port)
 386     {
 387     case 0x3c8:
 388     case 0x3c9:
 389         VGA_ioport_out( port, (BYTE)value );
 390         break;
 391     case 0x20:
 392         DOSVM_PIC_ioport_out( port, (BYTE)value );
 393         break;
 394     case 0x40:
 395     case 0x41:
 396     case 0x42:
 397     {
 398         BYTE chan = port & 3;
 399         WORD oldval = 0;
 400
 401         if ( ((tmr_8253_ctrlbyte_ch[chan] & 0x30) != 0x30) ||
 402 /* we need to get the oldval before any lo/hi byte change has been made */
 403              (tmr_8253_byte_toggle[chan] == FALSE) )
 404             oldval = tmr_8253_countmax[chan];
 405         switch (tmr_8253_ctrlbyte_ch[chan] & 0x30)
 406         {
 407         case 0x00:
 408             break; /* correct ? */
 409         case 0x10: /* write lo byte */
 410             tmr_8253_countmax[chan] =
 411                 (tmr_8253_countmax[chan] & 0xff00) | (BYTE)value;
 412             break;
 413         case 0x30: /* write lo byte, then hi byte */
 414             tmr_8253_byte_toggle[chan] ^= TRUE; /* toggle */
 415             if (tmr_8253_byte_toggle[chan] == TRUE)
 416             {
 417                 tmr_8253_countmax[chan] =
 418                     (tmr_8253_countmax[chan] & 0xff00) | (BYTE)value;
 419                 break;
 420             }
 421             /* else [fall through if write hi byte !] */
 422         case 0x20: /* write hi byte */
 423             tmr_8253_countmax[chan] =
 424                 (tmr_8253_countmax[chan] & 0xff)|((BYTE)value << 8);
 425             break;
 426         }
 427         if (
 428             /* programming finished ? */
 429             ( ((tmr_8253_ctrlbyte_ch[chan] & 0x30) != 0x30) ||
 430               (tmr_8253_byte_toggle[chan] == FALSE) )
 431             /* update to new value ? */
 432             && (tmr_8253_countmax[chan] != oldval)
 433             )
 434             set_timer_maxval(chan, tmr_8253_countmax[chan]);
 435     }
 436     break;
 437     case 0x43:
 438         {
 439           BYTE chan = ((BYTE)value & 0xc0) >> 6;
 440
 441         /* ctrl byte for specific timer channel */
 442           tmr_8253_ctrlbyte_ch[chan] = (BYTE)value;
 443           if (chan == 3) {
 444             FIXME("8254 timer readback not implemented yet\n");
 445             }
 446           else
 447           if (((BYTE)value&0x30)==0) { /* latch timer */
 448             tmr_8253_latched[chan] = TRUE;
 449             dummy_ctr -= 1+(int) (10.0*rand()/(RAND_MAX+1.0));
 450             if (chan == 0) /* System timer divisor */
 451               tmr_8253_latch[0] = dummy_ctr+(WORD)DOSVM_GetTimer();
 452             else
 453             {   /* FIXME: intelligent hardware timer emulation needed */
 454               tmr_8253_latch[chan] = dummy_ctr;
 455             }
 456           }
 457         if ((value & 0x30) == 0x30) /* write lo byte, then hi byte */
 458             tmr_8253_byte_toggle[((BYTE)value & 0xc0) >> 6] = FALSE; /* init */
 459         }
 460         break;
 461     case 0x61:
 462         parport_8255[1] = (BYTE)value;
 463         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253_countmax[2] != 1))
 464         {
 465             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253_countmax[2]);
 466             Beep(1193180 / tmr_8253_countmax[2], 20);
 467         }
 468         break;
 469     case 0x70:
 470         cmosaddress = (BYTE)value & 0x7f;
 471         break;
 472     case 0x71:
 473         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 474         break;
 475     default:
 476         WARN("Direct I/O write attempted to port %x\n", port );
 477         break;
 478     }
 479 }