dlls/krnl386.exe16/ioports.c

   1 /*
   2  * Emulation of processor ioports.
   3  *
   4  * Copyright 1995 Morten Welinder
   5  * Copyright 1998 Andreas Mohr, Ove Kaaven
   6  * Copyright 2001 Uwe Bonnes
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 /* Known problems:
  24    - only a few ports are emulated.
  25    - real-time clock in "cmos" is bogus.  A nifty alarm() setup could
  26      fix that, I guess.
  27 */
  28
  29 #include <stdarg.h>
  30 #include <stdlib.h>
  31 #include <sys/types.h>
  32
  33 #include "windef.h"
  34 #include "winbase.h"
  35 #include "winnls.h"
  36 #include "winreg.h"
  37 #include "winternl.h"
  38 #include "kernel16_private.h"
  39 #include "dosexe.h"
  40 #include "wine/debug.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(int);
  43
  44 static struct {
  45     WORD        countmax;
  46     WORD        latch;
  47     BYTE        ctrlbyte_ch;
  48     BYTE        flags;
  49     LONG64      start_time;
  50 } tmr_8253[3] = {
  51     {0xFFFF,    0,      0x36,   0,      0},
  52     {0x0012,    0,      0x74,   0,      0},
  53     {0x0001,    0,      0xB6,   0,      0},
  54 };
  55 /* two byte read in progress */
  56 #define TMR_RTOGGLE 0x01
  57 /* two byte write in progress */
  58 #define TMR_WTOGGLE 0x02
  59 /* latch contains data */
  60 #define TMR_LATCHED 0x04
  61 /* counter is in update phase */
  62 #define TMR_UPDATE  0x08
  63 /* readback status request */
  64 #define TMR_STATUS  0x10
  65
  66
  67 static BYTE parport_8255[4] = {0x4f, 0x20, 0xff, 0xff};
  68
  69 static BYTE cmosaddress;
  70
  71 static BOOL cmos_image_initialized = FALSE;
  72
  73 static BYTE cmosimage[64] =
  74 {
  75   0x27, /* 0x00: seconds */
  76   0x34, /* 0X01: seconds alarm */
  77   0x31, /* 0x02: minutes */
  78   0x47, /* 0x03: minutes alarm */
  79   0x16, /* 0x04: hour */
  80   0x15, /* 0x05: hour alarm */
  81   0x00, /* 0x06: week day */
  82   0x01, /* 0x07: month day */
  83   0x04, /* 0x08: month */
  84   0x94, /* 0x09: year */
  85   0x26, /* 0x0a: state A */
  86   0x02, /* 0x0b: state B */
  87   0x50, /* 0x0c: state C */
  88   0x80, /* 0x0d: state D */
  89   0x00, /* 0x0e: state diagnostic */
  90   0x00, /* 0x0f: state state shutdown */
  91   0x40, /* 0x10: floppy type */
  92   0xb1, /* 0x11: reserved */
  93   0x00, /* 0x12: HD type */
  94   0x9c, /* 0x13: reserved */
  95   0x01, /* 0x14: equipment */
  96   0x80, /* 0x15: low base memory */
  97   0x02, /* 0x16: high base memory (0x280 => 640KB) */
  98   0x00, /* 0x17: low extended memory */
  99   0x3b, /* 0x18: high extended memory (0x3b00 => 15MB) */
 100   0x00, /* 0x19: HD 1 extended type byte */
 101   0x00, /* 0x1a: HD 2 extended type byte */
 102   0xad, /* 0x1b: reserved */
 103   0x02, /* 0x1c: reserved */
 104   0x10, /* 0x1d: reserved */
 105   0x00, /* 0x1e: reserved */
 106   0x00, /* 0x1f: installed features */
 107   0x08, /* 0x20: HD 1 low cylinder number */
 108   0x00, /* 0x21: HD 1 high cylinder number */
 109   0x00, /* 0x22: HD 1 heads */
 110   0x26, /* 0x23: HD 1 low pre-compensation start */
 111   0x00, /* 0x24: HD 1 high pre-compensation start */
 112   0x00, /* 0x25: HD 1 low landing zone */
 113   0x00, /* 0x26: HD 1 high landing zone */
 114   0x00, /* 0x27: HD 1 sectors */
 115   0x00, /* 0x28: options 1 */
 116   0x00, /* 0x29: reserved */
 117   0x00, /* 0x2a: reserved */
 118   0x00, /* 0x2b: options 2 */
 119   0x00, /* 0x2c: options 3 */
 120   0x3f, /* 0x2d: reserved  */
 121   0xcc, /* 0x2e: low CMOS ram checksum (computed automatically) */
 122   0xcc, /* 0x2f: high CMOS ram checksum (computed automatically) */
 123   0x00, /* 0x30: low extended memory byte */
 124   0x1c, /* 0x31: high extended memory byte */
 125   0x19, /* 0x32: century byte */
 126   0x81, /* 0x33: setup information */
 127   0x00, /* 0x34: CPU speed */
 128   0x0e, /* 0x35: HD 2 low cylinder number */
 129   0x00, /* 0x36: HD 2 high cylinder number */
 130   0x80, /* 0x37: HD 2 heads */
 131   0x1b, /* 0x38: HD 2 low pre-compensation start */
 132   0x7b, /* 0x39: HD 2 high pre-compensation start */
 133   0x21, /* 0x3a: HD 2 low landing zone */
 134   0x00, /* 0x3b: HD 2 high landing zone */
 135   0x00, /* 0x3c: HD 2 sectors */
 136   0x00, /* 0x3d: reserved */
 137   0x05, /* 0x3e: reserved */
 138   0x5f  /* 0x3f: reserved */
 139 };
 140
 141 static void IO_FixCMOSCheckSum(void)
 142 {
 143         WORD sum = 0;
 144         int i;
 145
 146         for (i=0x10; i < 0x2d; i++)
 147                 sum += cmosimage[i];
 148         cmosimage[0x2e] = sum >> 8; /* yes, this IS hi byte !! */
 149         cmosimage[0x2f] = sum & 0xff;
 150         TRACE("calculated hi %02x, lo %02x\n", cmosimage[0x2e], cmosimage[0x2f]);
 151 }
 152
 153 #define BCD2BIN(a) \
 154 ((a)%10 + ((a)>>4)%10*10 + ((a)>>8)%10*100 + ((a)>>12)%10*1000)
 155 #define BIN2BCD(a) \
 156 ((a)%10 | (a)/10%10<<4 | (a)/100%10<<8 | (a)/1000%10<<12)
 157
 158
 159 static void set_timer(unsigned timer)
 160 {
 161     DWORD val = tmr_8253[timer].countmax;
 162
 163     if (tmr_8253[timer].ctrlbyte_ch & 0x01)
 164         val = BCD2BIN(val);
 165
 166     tmr_8253[timer].flags &= ~TMR_UPDATE;
 167     if (!QueryPerformanceCounter((LARGE_INTEGER*)&tmr_8253[timer].start_time))
 168         WARN("QueryPerformanceCounter should not fail!\n");
 169
 170     switch (timer) {
 171         case 0: /* System timer counter divisor */
 172             break;
 173         case 1: /* RAM refresh */
 174             FIXME("RAM refresh counter handling not implemented !\n");
 175             break;
 176         case 2: /* cassette & speaker */
 177             /* speaker on ? */
 178             if ((parport_8255[1] & 3) == 3)
 179             {
 180                 TRACE("Beep (freq: %ld) !\n", 1193180 / val);
 181                 Beep(1193180 / val, 20);
 182             }
 183             break;
 184     }
 185 }
 186
 187
 188 static WORD get_timer_val(unsigned timer)
 189 {
 190     LARGE_INTEGER time;
 191     WORD maxval, val = tmr_8253[timer].countmax;
 192     BYTE mode = tmr_8253[timer].ctrlbyte_ch >> 1 & 0x07;
 193
 194     /* This is not strictly correct. In most cases the old countdown should
 195      * finish normally (by counting down to 0) or halt and not jump to 0.
 196      * But we are calculating and not counting, so this seems to be a good
 197      * solution and should work well with most (all?) programs
 198      */
 199     if (tmr_8253[timer].flags & TMR_UPDATE)
 200         return 0;
 201
 202     if (!QueryPerformanceCounter(&time))
 203         WARN("QueryPerformanceCounter should not fail!\n");
 204
 205     time.QuadPart -= tmr_8253[timer].start_time;
 206     if (tmr_8253[timer].ctrlbyte_ch & 0x01)
 207         val = BCD2BIN(val);
 208
 209     switch ( mode )
 210     {
 211         case 0:
 212         case 1:
 213         case 4:
 214         case 5:
 215             maxval = tmr_8253[timer].ctrlbyte_ch & 0x01 ? 9999 : 0xFFFF;
 216             break;
 217         case 2:
 218         case 3:
 219             maxval = val;
 220             break;
 221         default:
 222             ERR("Invalid PIT mode: %d\n", mode);
 223             return 0;
 224     }
 225
 226     val = (val - time.QuadPart) % (maxval + 1);
 227     if (tmr_8253[timer].ctrlbyte_ch & 0x01)
 228         val = BIN2BCD(val);
 229
 230     return val;
 231 }
 232
 233
 234
 235 /**********************************************************************
 236  *          DOSVM_inport
 237  *
 238  * Note: The size argument has to be handled correctly _externally_
 239  * (as we always return a DWORD)
 240  */
 241 DWORD DOSVM_inport( int port, int size )
 242 {
 243     DWORD res = ~0U;
 244
 245     TRACE("%d-byte value from port 0x%04x\n", size, port );
 246
 247     DOSMEM_InitDosMemory();
 248
 249     switch (port)
 250     {
 251     case 0x40:
 252     case 0x41:
 253     case 0x42:
 254         {
 255             BYTE chan = port & 3;
 256             WORD tempval = tmr_8253[chan].flags & TMR_LATCHED
 257                 ? tmr_8253[chan].latch : get_timer_val(chan);
 258
 259             if (tmr_8253[chan].flags & TMR_STATUS)
 260             {
 261                 WARN("Read-back status\n");
 262                 /* We differ slightly from the spec:
 263                  * - TMR_UPDATE is already set with the first write
 264                  *   of a two byte counter update
 265                  * - 0x80 should be set if OUT signal is 1 (high)
 266                  */
 267                 tmr_8253[chan].flags &= ~TMR_STATUS;
 268                 res = (tmr_8253[chan].ctrlbyte_ch & 0x3F) |
 269                     (tmr_8253[chan].flags & TMR_UPDATE ? 0x40 : 0x00);
 270                 break;
 271             }
 272             switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 273             {
 274             case 0:
 275                 res = 0; /* shouldn't happen? */
 276                 break;
 277             case 1: /* read lo byte */
 278                 res = (BYTE)tempval;
 279                 tmr_8253[chan].flags &= ~TMR_LATCHED;
 280                 break;
 281             case 3: /* read lo byte, then hi byte */
 282                 tmr_8253[chan].flags ^= TMR_RTOGGLE; /* toggle */
 283                 if (tmr_8253[chan].flags & TMR_RTOGGLE)
 284                 {
 285                     res = (BYTE)tempval;
 286                     break;
 287                 }
 288                 /* else [fall through if read hi byte !] */
 289             case 2: /* read hi byte */
 290                 res = (BYTE)(tempval >> 8);
 291                 tmr_8253[chan].flags &= ~TMR_LATCHED;
 292                 break;
 293             }
 294         }
 295         break;
 296     case 0x60:
 297         break;
 298     case 0x61:
 299         res = (DWORD)parport_8255[1];
 300         break;
 301     case 0x62:
 302         res = (DWORD)parport_8255[2];
 303         break;
 304     case 0x70:
 305         res = (DWORD)cmosaddress;
 306         break;
 307     case 0x71:
 308         if (!cmos_image_initialized)
 309         {
 310             IO_FixCMOSCheckSum();
 311             cmos_image_initialized = TRUE;
 312         }
 313         res = (DWORD)cmosimage[cmosaddress & 0x3f];
 314         break;
 315     case 0x200:
 316     case 0x201:
 317         res = ~0U; /* no joystick */
 318         break;
 319     case 0x3da:
 320         res = GetTickCount() % 17 == 0 ? 0x4 : 0; /* report vblank about 60 times per second */
 321         break;
 322     default:
 323         WARN("Direct I/O read attempted from port %x\n", port);
 324         break;
 325     }
 326     return res;
 327 }
 328
 329
 330 /**********************************************************************
 331  *          DOSVM_outport
 332  */
 333 void DOSVM_outport( int port, int size, DWORD value )
 334 {
 335     TRACE("IO: 0x%lx (%d-byte value) to port 0x%04x\n", value, size, port );
 336
 337     DOSMEM_InitDosMemory();
 338
 339     switch (port)
 340     {
 341     case 0x20:
 342         break;
 343     case 0x40:
 344     case 0x41:
 345     case 0x42:
 346         {
 347             BYTE chan = port & 3;
 348
 349             tmr_8253[chan].flags |= TMR_UPDATE;
 350             switch ((tmr_8253[chan].ctrlbyte_ch & 0x30) >> 4)
 351             {
 352             case 0:
 353                 break; /* shouldn't happen? */
 354             case 1: /* write lo byte */
 355                 tmr_8253[chan].countmax =
 356                     (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 357                 break;
 358             case 3: /* write lo byte, then hi byte */
 359                 tmr_8253[chan].flags ^= TMR_WTOGGLE; /* toggle */
 360                 if (tmr_8253[chan].flags & TMR_WTOGGLE)
 361                 {
 362                     tmr_8253[chan].countmax =
 363                         (tmr_8253[chan].countmax & 0xff00) | (BYTE)value;
 364                     break;
 365                 }
 366                 /* else [fall through if write hi byte !] */
 367             case 2: /* write hi byte */
 368                 tmr_8253[chan].countmax =
 369                     (tmr_8253[chan].countmax & 0x00ff) | ((BYTE)value << 8);
 370                 break;
 371             }
 372             /* if programming is finished, update to new value */
 373             if ((tmr_8253[chan].ctrlbyte_ch & 0x30) &&
 374                 !(tmr_8253[chan].flags & TMR_WTOGGLE))
 375                 set_timer(chan);
 376         }
 377         break;
 378     case 0x43:
 379        {
 380            BYTE chan = ((BYTE)value & 0xc0) >> 6;
 381            /* ctrl byte for specific timer channel */
 382            if (chan == 3)
 383            {
 384                if ( !(value & 0x20) )
 385                {
 386                    if ((value & 0x02) && !(tmr_8253[0].flags & TMR_LATCHED))
 387                    {
 388                        tmr_8253[0].flags |= TMR_LATCHED;
 389                        tmr_8253[0].latch = get_timer_val(0);
 390                    }
 391                    if ((value & 0x04) && !(tmr_8253[1].flags & TMR_LATCHED))
 392                    {
 393                        tmr_8253[1].flags |= TMR_LATCHED;
 394                        tmr_8253[1].latch = get_timer_val(1);
 395                    }
 396                    if ((value & 0x08) && !(tmr_8253[2].flags & TMR_LATCHED))
 397                    {
 398                        tmr_8253[2].flags |= TMR_LATCHED;
 399                        tmr_8253[2].latch = get_timer_val(2);
 400                    }
 401                }
 402
 403                if ( !(value & 0x10) )
 404                {
 405                    if (value & 0x02)
 406                        tmr_8253[0].flags |= TMR_STATUS;
 407                    if (value & 0x04)
 408                        tmr_8253[1].flags |= TMR_STATUS;
 409                    if (value & 0x08)
 410                        tmr_8253[2].flags |= TMR_STATUS;
 411                }
 412                break;
 413            }
 414            switch (((BYTE)value & 0x30) >> 4)
 415            {
 416            case 0:      /* latch timer */
 417                if ( !(tmr_8253[chan].flags & TMR_LATCHED) )
 418                {
 419                    tmr_8253[chan].flags |= TMR_LATCHED;
 420                    tmr_8253[chan].latch = get_timer_val(chan);
 421                }
 422                break;
 423            case 1:      /* write lo byte only */
 424            case 2:      /* write hi byte only */
 425            case 3:      /* write lo byte, then hi byte */
 426                tmr_8253[chan].ctrlbyte_ch = (BYTE)value;
 427                tmr_8253[chan].countmax = 0;
 428                tmr_8253[chan].flags = TMR_UPDATE;
 429                break;
 430            }
 431        }
 432        break;
 433     case 0x61:
 434         parport_8255[1] = (BYTE)value;
 435         if (((parport_8255[1] & 3) == 3) && (tmr_8253[2].countmax != 1))
 436         {
 437             TRACE("Beep (freq: %d) !\n", 1193180 / tmr_8253[2].countmax);
 438             Beep(1193180 / tmr_8253[2].countmax, 20);
 439         }
 440         break;
 441     case 0x70:
 442         cmosaddress = (BYTE)value & 0x7f;
 443         break;
 444     case 0x71:
 445         if (!cmos_image_initialized)
 446         {
 447             IO_FixCMOSCheckSum();
 448             cmos_image_initialized = TRUE;
 449         }
 450         cmosimage[cmosaddress & 0x3f] = (BYTE)value;
 451         break;
 452     default:
 453         WARN("Direct I/O write attempted to port %x\n", port );
 454         break;
 455     }
 456 }