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,  0x36,   0},
  41     {0x0012,    FALSE,  0,      FALSE,  0x74,   0},
  42     {0x0001,    FALSE,  0,      FALSE,  0xB6,   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             if (Dosvm.Current())
 102               Dosvm.SetTimer(maxval);
 103             break;
 104         case 1: /* RAM refresh */
 105             FIXME("RAM refresh counter handling not implemented !\n");
 106             break;
 107         case 2: /* cassette & speaker */
 108             /* speaker on ? */
 109             if (((BYTE)parport_8255[1] & 3) == 3)
 110             {
 111                 TRACE("Beep (freq: %d) !\n", 1193180 / maxval );
 112                 Beep(1193180 / maxval, 20);
 113             }
 114             break;
 115     }
 116 }
 117
 118 /**********************************************************************
 119  *          IO_port_init
 120  */
 121
 122 /* set_IO_permissions(int val1, int val)
 123  * Helper function for IO_port_init
 124  */
 125 #ifdef DIRECT_IO_ACCESS
 126 static void set_IO_permissions(int val1, int val, char rw)
 127 {
 128         int j;
 129         if (val1 != -1) {
 130                 if (val == -1) val = 0x3ff;
 131                 for (j = val1; j <= val; j++)
 132                         port_permissions[j] |= rw;
 133
 134                 do_direct_port_access = 1;
 135
 136                 val1 = -1;
 137         } else if (val != -1) {
 138                 do_direct_port_access = 1;
 139
 140                 port_permissions[val] |= rw;
 141         }
 142
 143 }
 144
 145 /* do_IO_port_init_read_or_write(char* temp, char rw)
 146  * Helper function for IO_port_init
 147  */
 148
 149 static void do_IO_port_init_read_or_write(char* temp, char rw)
 150 {
 151         int val, val1, i, len;
 152         if (!strcasecmp(temp, "all")) {
 153                 MESSAGE("Warning!!! Granting FULL IO port access to"
 154                         " windoze programs!\nWarning!!! "
 155                         "*** THIS IS NOT AT ALL "
 156                         "RECOMMENDED!!! ***\n");
 157                 for (i=0; i < sizeof(port_permissions); i++)
 158                         port_permissions[i] |= rw;
 159
 160         } else if (!(!strcmp(temp, "*") || *temp == '\0')) {
 161                 len = strlen(temp);
 162                 val = -1;
 163                 val1 = -1;
 164                 for (i = 0; i < len; i++) {
 165                         switch (temp[i]) {
 166                         case '0':
 167                                 if (temp[i+1] == 'x' || temp[i+1] == 'X') {
 168                                         sscanf(temp+i, "%x", &val);
 169                                         i += 2;
 170                                 } else {
 171                                         sscanf(temp+i, "%d", &val);
 172                                 }
 173                                 while (isxdigit(temp[i]))
 174                                         i++;
 175                                 i--;
 176                                 break;
 177                         case ',':
 178                         case ' ':
 179                         case '\t':
 180                                 set_IO_permissions(val1, val, rw);
 181                                 val1 = -1; val = -1;
 182                                 break;
 183                         case '-':
 184                                 val1 = val;
 185                                 if (val1 == -1) val1 = 0;
 186                                 break;
 187                         default:
 188                                 if (temp[i] >= '0' && temp[i] <= '9') {
 189                                         sscanf(temp+i, "%d", &val);
 190                                         while (isdigit(temp[i]))
 191                                                 i++;
 192                                 }
 193                         }
 194                 }
 195                 set_IO_permissions(val1, val, rw);
 196         }
 197 }
 198
 199 static inline BYTE inb( WORD port )
 200 {
 201     BYTE b;
 202     __asm__ __volatile__( "inb %w1,%0" : "=a" (b) : "d" (port) );
 203     return b;
 204 }
 205
 206 static inline WORD inw( WORD port )
 207 {
 208     WORD w;
 209     __asm__ __volatile__( "inw %w1,%0" : "=a" (w) : "d" (port) );
 210     return w;
 211 }
 212
 213 static inline DWORD inl( WORD port )
 214 {
 215     DWORD dw;
 216     __asm__ __volatile__( "inl %w1,%0" : "=a" (dw) : "d" (port) );
 217     return dw;
 218 }
 219
 220 static inline void outb( BYTE value, WORD port )
 221 {
 222     __asm__ __volatile__( "outb %b0,%w1" : : "a" (value), "d" (port) );
 223 }
 224
 225 static inline void outw( WORD value, WORD port )
 226 {
 227     __asm__ __volatile__( "outw %w0,%w1" : : "a" (value), "d" (port) );
 228 }
 229
 230 static inline void outl( DWORD value, WORD port )
 231 {
 232     __asm__ __volatile__( "outl %0,%w1" : : "a" (value), "d" (port) );
 233 }
 234
 235 static void IO_port_init(void)
 236 {
 237         char temp[1024];
 238
 239         do_direct_port_access = 0;
 240         /* Can we do that? */
 241         if (!iopl(3)) {
 242                 iopl(0);
 243
 244                 PROFILE_GetWineIniString( "ports", "read", "*",
 245                                          temp, sizeof(temp) );
 246                 do_IO_port_init_read_or_write(temp, IO_READ);
 247                 PROFILE_GetWineIniString( "ports", "write", "*",
 248                                          temp, sizeof(temp) );
 249                 do_IO_port_init_read_or_write(temp, IO_WRITE);
 250         }
 251     IO_FixCMOSCheckSum();
 252 }
 253
 254 #endif  /* DIRECT_IO_ACCESS */
 255
 256 /**********************************************************************
 257  *          IO_inport
 258  *
 259  * Note: The size argument has to be handled correctly _externally_
 260  * (as we always return a DWORD)
 261  */
 262 DWORD IO_inport( int port, int size )
 263 {
 264     DWORD res = 0;
 265
 266     TRACE("%d-byte value from port 0x%02x\n", size, port );
 267
 268 #ifdef HAVE_PPDEV
 269     if (do_pp_port_access == -1)
 270       do_pp_port_access =IO_pp_init();
 271     if ((do_pp_port_access == 0 ) && (size == 1))
 272       if (!IO_pp_inp(port,&res))
 273          return res;
 274 #endif
 275 #ifdef DIRECT_IO_ACCESS
 276     if (do_direct_port_access == -1) IO_port_init();
 277     if ((do_direct_port_access)
 278         /* Make sure we have access to the port */
 279         && (port_permissions[port] & IO_READ))
 280     {
 281         iopl(3);
 282         switch(size)
 283         {
 284         case 1: res = inb( port ); break;
 285         case 2: res = inw( port ); break;
 286         case 4: res = inl( port ); break;
 287         default:
 288             ERR("invalid data size %d\n", size);
 289         }
 290         iopl(0);
 291         return res;
 292     }
 293 #endif
 294
 295     switch (port)
 296     {
 297     case 0x40:
 298     case 0x41:
 299     case 0x42:
 300     {
 301         BYTE chan = port & 3;
 302         WORD tempval = 0;
 303         if (tmr_8253[chan].latched)
 304             tempval = tmr_8253[chan].latch;
 305         else
 306         {
 307             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 308             if (chan == 0) /* System timer counter divisor */
 309             {
 310                 /* FIXME: Dosvm.GetTimer() returns quite rigid values */
 311                 if (Dosvm.Current())
 312                   tempval = dummy_ctr + (WORD)Dosvm.GetTimer();
 313                 else
 314                   tempval = dummy_ctr;
 315             }
 316             else
 317             {
 318                 /* FIXME: intelligent hardware timer emulation needed */
 319                 tempval = dummy_ctr;
 320             }
 321         }
 322
 323         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 324         {
 325         case 0:
 326             res = 0; /* shouldn't happen? */
 327             break;
 328         case 1: /* read lo byte */
 329             res = (BYTE)tempval;
 330             tmr_8253[chan].latched = FALSE;
 331             break;
 332         case 3: /* read lo byte, then hi byte */
 333             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 334             if (tmr_8253[chan].byte_toggle)
 335             {
 336                 res = (BYTE)tempval;
 337                 break;
 338             }
 339             /* else [fall through if read hi byte !] */
 340         case 2: /* read hi byte */
 341             res = (BYTE)(tempval >> 8);
 342             tmr_8253[chan].latched = FALSE;
 343             break;
 344         }
 345     }
 346     break;
 347     case 0x60:
 348         res = Dosvm.KbdReadScan ? Dosvm.KbdReadScan(NULL) : 0;
 349 #if 0 /* what's this port got to do with parport ? */
 350         res = (DWORD)parport_8255[0];
 351 #endif
 352         break;
 353     case 0x61:
 354         res = (DWORD)parport_8255[1];
 355         break;
 356     case 0x62:
 357         res = (DWORD)parport_8255[2];
 358         break;
 359     case 0x70:
 360         res = (DWORD)cmosaddress;
 361         break;
 362     case 0x71:
 363         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 364         break;
 365     case 0x200:
 366     case 0x201:
 367         res = 0xffffffff; /* no joystick */
 368         break;
 369     case 0x3ba:
 370     case 0x3da:
 371         res = (DWORD)VGA_ioport_in( port );
 372         break;
 373     default:
 374         WARN("Direct I/O read attempted from port %x\n", port);
 375         res = 0xffffffff;
 376         break;
 377     }
 378     TRACE("  returning ( 0x%lx )\n", res );
 379     return res;
 380 }
 381
 382
 383 /**********************************************************************
 384  *          IO_outport
 385  */
 386 void IO_outport( int port, int size, DWORD value )
 387 {
 388     TRACE("IO: 0x%lx (%d-byte value) to port 0x%02x\n",
 389                  value, size, port );
 390
 391 #ifdef HAVE_PPDEV
 392     if (do_pp_port_access == -1)
 393       do_pp_port_access = IO_pp_init();
 394     if ((do_pp_port_access == 0) && (size == 1))
 395       if (!IO_pp_outp(port,&value))
 396          return;
 397 #endif
 398 #ifdef DIRECT_IO_ACCESS
 399
 400     if (do_direct_port_access == -1) IO_port_init();
 401     if ((do_direct_port_access)
 402         /* Make sure we have access to the port */
 403         && (port_permissions[port] & IO_WRITE))
 404     {
 405         iopl(3);
 406         switch(size)
 407         {
 408         case 1: outb( LOBYTE(value), port ); break;
 409         case 2: outw( LOWORD(value), port ); break;
 410         case 4: outl( value, port ); break;
 411         default:
 412             WARN("Invalid data size %d\n", size);
 413         }
 414         iopl(0);
 415         return;
 416     }
 417 #endif
 418
 419     switch (port)
 420     {
 421     case 0x20:
 422         if (Dosvm.Current())
 423           Dosvm.OutPIC( port, (BYTE)value );
 424         break;
 425     case 0x40:
 426     case 0x41:
 427     case 0x42:
 428     {
 429         BYTE chan = port & 3;
 430
 431         /* we need to get the oldval before any lo/hi byte change has been made */
 432         if (((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 433             !tmr_8253[chan].byte_toggle)
 434             tmr_8253[chan].oldval = tmr_8253[chan].countmax;
 435         switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 436         {
 437         case 0:
 438             break; /* shouldn't happen? */
 439         case 1: /* write lo byte */
 440             tmr_8253[chan].countmax =
 441                 (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 442             break;
 443         case 3: /* write lo byte, then hi byte */
 444             tmr_8253[chan].byte_toggle ^= TRUE; /* toggle */
 445             if (tmr_8253[chan].byte_toggle)
 446             {
 447                 tmr_8253[chan].countmax =
 448                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 449                 break;
 450             }
 451             /* else [fall through if write hi byte !] */
 452         case 2: /* write hi byte */
 453             tmr_8253[chan].countmax =
 454                 (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 455             break;
 456         }
 457         /* if programming is finished and value has changed
 458            then update to new value */
 459         if ((((tmr_8253[chan].ctrlbyte_ch & 0x30) != 0x30) ||
 460              !tmr_8253[chan].byte_toggle) &&
 461             (tmr_8253[chan].countmax != tmr_8253[chan].oldval))
 462             set_timer_maxval(chan, tmr_8253[chan].countmax);
 463     }
 464     break;
 465     case 0x43:
 466     {
 467         BYTE chan = ((BYTE)value & 0xc0) >> 6;
 468         /* ctrl byte for specific timer channel */
 469         if (chan == 3)
 470         {
 471             FIXME("8254 timer readback not implemented yet\n");
 472             break;
 473         }
 474         switch (((BYTE)value & 0x30) >> 4)
 475         {
 476         case 0: /* latch timer */
 477             tmr_8253[chan].latched = TRUE;
 478             dummy_ctr -= 1 + (int)(10.0 * rand() / (RAND_MAX + 1.0));
 479             if (chan == 0) /* System timer divisor */
 480                 if (Dosvm.Current())
 481                   tmr_8253[chan].latch = dummy_ctr + (WORD)Dosvm.GetTimer();
 482                 else
 483                   tmr_8253[chan].latch = dummy_ctr;
 484             else
 485             {
 486                 /* FIXME: intelligent hardware timer emulation needed */
 487                 tmr_8253[chan].latch = dummy_ctr;
 488             }
 489             break;
 490         case 3: /* write lo byte, then hi byte */
 491             tmr_8253[chan].byte_toggle = FALSE; /* init */
 492             /* fall through */
 493         case 1: /* write lo byte only */
 494         case 2: /* write hi byte only */
 495             tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 496             break;
 497         }
 498     }
 499     break;
 500     case 0x61:
 501         parport_8255[1] = (BYTE)value;
 502         if ((((BYTE)parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 503         {
 504             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 505             Beep(1193180 / tmr_8253[2].countmax, 20);
 506         }
 507         break;
 508     case 0x70:
 509         cmosaddress = (BYTE)value & 0x7f;
 510         break;
 511     case 0x71:
 512         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 513         break;
 514     case 0x3c8:
 515     case 0x3c9:
 516         VGA_ioport_out( port, (BYTE)value );
 517         break;
 518     default:
 519         WARN("Direct I/O write attempted to port %x\n", port );
 520         break;
 521     }
 522 }