dlls/krnl386.exe16/dma.c

   1 /*
   2  * DMA Emulation
   3  *
   4  * Copyright 2002 Christian Costa
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdarg.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "dosexe.h"
  28 #include "wine/debug.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(dma);
  31
  32 /* Internal registers of the 2 DMA chips which control 8 DMA channels */
  33 static DWORD DMA_BaseAddress[8];
  34 static WORD  DMA_ByteCount[8];
  35 static DWORD DMA_CurrentBaseAddress[8];
  36 static WORD  DMA_CurrentByteCount[8];
  37 static BYTE  DMA_Command[8];
  38 static BYTE  DMA_Mask[2]={0x0F,0x0F};
  39 static BYTE  DMA_Status[2]={0x00,0x00};
  40 static BOOL  DMA_Toggle[2]={FALSE,FALSE};
  41
  42 /*
  43  * DMA_Transfer : Try to perform a transfer of reqlen elements (8 or 16 bits)
  44  * on the specified channel and return the elements transferred
  45  */
  46 int DMA_Transfer(int channel,int reqlen,void* buffer)
  47 {
  48     int i,size,ret=0;
  49     int opmode,increment,autoinit,trmode,dmachip;
  50     int regmode = DMA_Command[channel];
  51     char *p,*dmabuf;
  52
  53     dmabuf = buffer;
  54     dmachip = (channel<4) ? 0 : 1;
  55
  56     TRACE("DMA_Command = %x reqlen=%d\n",regmode,reqlen);
  57
  58     /* Exit if channel is masked */
  59     if (DMA_Mask[dmachip]&(1<<(channel&3)))
  60         return 0;
  61
  62     opmode = (regmode & 0xC0) >> 6;
  63     increment = !(regmode & 0x20);
  64     autoinit = regmode & 0x10;
  65     trmode = (regmode & 0x0C) >> 2;
  66
  67     /* Transfer size : 8 bits for channels 0..3, 16 bits for channels 4..7 */
  68     size = (channel<4) ? 1 : 2;
  69
  70     /* Process operating mode */
  71     switch(opmode)
  72     {
  73     case 0:
  74         /* Request mode */
  75         FIXME("Request Mode - Not Implemented\n");
  76         return 0;
  77     case 1:
  78         /* Single Mode */
  79         break;
  80     case 2:
  81         /* Request mode */
  82         FIXME("Block Mode - Not Implemented\n");
  83         return 0;
  84     case 3:
  85         /* Cascade Mode */
  86         ERR("Cascade Mode should not be used by regular apps\n");
  87         return 0;
  88     }
  89
  90     /* Perform one the 4 transfer modes */
  91     if (trmode == 4) {
  92         /* Illegal */
  93         ERR("DMA Transfer Type Illegal\n");
  94         return 0;
  95     }
  96
  97     ret = min(DMA_CurrentByteCount[channel],reqlen);
  98
  99     /* Update DMA registers */
 100     DMA_CurrentByteCount[channel]-=ret;
 101     if (increment)
 102         DMA_CurrentBaseAddress[channel] += ret * size;
 103     else
 104         DMA_CurrentBaseAddress[channel] -= ret * size;
 105
 106     switch(trmode)
 107     {
 108     case 0:
 109         /* Verification (no real transfer)*/
 110         TRACE("Verification DMA operation\n");
 111         break;
 112     case 1:
 113         /* Write */
 114         TRACE("Perform Write transfer of %d bytes at %x with count %x\n",ret,
 115             DMA_CurrentBaseAddress[channel],DMA_CurrentByteCount[channel]);
 116         if (increment)
 117             memcpy((void*)DMA_CurrentBaseAddress[channel],dmabuf,ret*size);
 118         else
 119             for(i=0,p=(char*)DMA_CurrentBaseAddress[channel];i<ret*size;i++)
 120                 /* FIXME: possible endianness issue for 16 bits DMA */
 121                 *(p-i) = dmabuf[i];
 122         break;
 123     case 2:
 124         /* Read */
 125         TRACE("Perform Read transfer of %d bytes at %x with count %x\n",ret,
 126             DMA_CurrentBaseAddress[channel],DMA_CurrentByteCount[channel]);
 127         if (increment)
 128             memcpy(dmabuf,(void*)DMA_CurrentBaseAddress[channel],ret*size);
 129         else
 130             for(i=0,p=(char*)DMA_CurrentBaseAddress[channel];i<ret*size;i++)
 131                 /* FIXME: possible endianness issue for 16 bits DMA */
 132                 dmabuf[i] = *(p-i);
 133         break;
 134     }
 135
 136     /* Check for end of transfer */
 137     if (DMA_CurrentByteCount[channel]==0) {
 138         TRACE("DMA buffer empty\n");
 139
 140         /* Update status register of the DMA chip corresponding to the channel */
 141         DMA_Status[dmachip] |= 1 << (channel & 0x3); /* Mark transfer as finished */
 142         DMA_Status[dmachip] &= ~(1 << ((channel & 0x3) + 4)); /* Reset soft request if any */
 143
 144         if (autoinit) {
 145             /* Reload Current* register to their initial values */
 146             DMA_CurrentBaseAddress[channel] = DMA_BaseAddress[channel];
 147             DMA_CurrentByteCount[channel] = DMA_ByteCount[channel];
 148         }
 149     }
 150
 151     return ret;
 152 }
 153
 154
 155 void DMA_ioport_out( WORD port, BYTE val )
 156 {
 157     int channel,dmachip;
 158
 159     switch(port)
 160     {
 161     case 0x00:
 162     case 0x02:
 163     case 0x04:
 164     case 0x06:
 165     case 0xC0:
 166     case 0xC4:
 167     case 0xC8:
 168     case 0xCC:
 169         /* Base Address*/
 170         channel = (port&0xC0)?((port-0xC0)>>2):(port>>1);
 171         dmachip = (channel<4) ? 0 : 1;
 172         if (!DMA_Toggle[dmachip])
 173             DMA_BaseAddress[channel]=(DMA_BaseAddress[channel] & ~0xFF)|(val & 0xFF);
 174         else {
 175             DMA_BaseAddress[channel]=(DMA_BaseAddress[channel] & (~(0xFF << 8)))|((val & 0xFF) << 8);
 176             DMA_CurrentBaseAddress[channel] = DMA_BaseAddress[channel];
 177             TRACE("Write Base Address = %x\n",DMA_BaseAddress[channel]);
 178         }
 179         DMA_Toggle[dmachip] = !DMA_Toggle[dmachip];
 180         break;
 181
 182     case 0x01:
 183     case 0x03:
 184     case 0x05:
 185     case 0x07:
 186     case 0xC2:
 187     case 0xC6:
 188     case 0xCA:
 189     case 0xCE:
 190         /* Count*/
 191         channel = ((port-1)&0xC0)?(((port-1)-0xC0)>>2):(port>>1);
 192         dmachip = (channel<4) ? 0 : 1;
 193         if (!DMA_Toggle[dmachip])
 194             DMA_ByteCount[channel]=(DMA_ByteCount[channel] & ~0xFF)|((val+1) & 0xFF);
 195         else {
 196             DMA_ByteCount[channel]=(DMA_ByteCount[channel] & (~(0xFF << 8)))|(((val+1) & 0xFF) << 8);
 197             DMA_CurrentByteCount[channel] = DMA_ByteCount[channel];
 198             TRACE("Write Count = %x.\n",DMA_ByteCount[channel]);
 199         }
 200         DMA_Toggle[dmachip] = !DMA_Toggle[dmachip];
 201         break;
 202
 203     /* Low Page Base Address */
 204     case 0x87: DMA_BaseAddress[0]=(DMA_BaseAddress[0] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 205     case 0x83: DMA_BaseAddress[1]=(DMA_BaseAddress[1] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 206     case 0x81: DMA_BaseAddress[2]=(DMA_BaseAddress[2] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 207     case 0x82: DMA_BaseAddress[3]=(DMA_BaseAddress[3] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 208     case 0x8B: DMA_BaseAddress[5]=(DMA_BaseAddress[5] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 209     case 0x89: DMA_BaseAddress[6]=(DMA_BaseAddress[6] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 210     case 0x8A: DMA_BaseAddress[7]=(DMA_BaseAddress[7] & 0xFF00FFFF)|((val & 0xFF) << 16); break;
 211
 212     /* Low Page Base Address (only 4 lower bits are significant) */
 213     case 0x487: DMA_BaseAddress[0]=(DMA_BaseAddress[0] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 214     case 0x483: DMA_BaseAddress[1]=(DMA_BaseAddress[1] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 215     case 0x481: DMA_BaseAddress[2]=(DMA_BaseAddress[2] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 216     case 0x482: DMA_BaseAddress[3]=(DMA_BaseAddress[3] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 217     case 0x48B: DMA_BaseAddress[5]=(DMA_BaseAddress[5] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 218     case 0x489: DMA_BaseAddress[6]=(DMA_BaseAddress[6] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 219     case 0x48A: DMA_BaseAddress[7]=(DMA_BaseAddress[7] & 0x00FFFFFF)|((val & 0x0F) << 24); break;
 220
 221     case 0x08:
 222     case 0xD0:
 223         /* Command */
 224         FIXME("Write Command (%x) - Not Implemented\n",val);
 225         break;
 226
 227     case 0x0B:
 228     case 0xD6:
 229         /* Mode */
 230         TRACE("Write Mode (%x)\n",val);
 231         DMA_Command[((port==0xD6)?4:0)+(val&0x3)]=val;
 232         switch(val>>6)
 233         {
 234         case 0:
 235             /* Request mode */
 236             FIXME("Request Mode - Not Implemented\n");
 237             break;
 238         case 1:
 239             /* Single Mode */
 240             break;
 241         case 2:
 242             /* Block mode */
 243             FIXME("Block Mode - Not Implemented\n");
 244             break;
 245         case 3:
 246             /* Cascade Mode */
 247             ERR("Cascade Mode should not be used by regular apps\n");
 248             break;
 249         }
 250         break;
 251
 252     case 0x0A:
 253     case 0xD4:
 254         /* Write Single Mask Bit */
 255         TRACE("Write Single Mask Bit (%x)\n",val);
 256         dmachip = (port==0x0A) ? 0 : 1;
 257         if (val&4)
 258             DMA_Mask[dmachip] |= 1<<(val&3);
 259         else
 260             DMA_Mask[dmachip] &= ~(1<<(val&3));
 261         break;
 262
 263     case 0x0F:
 264     case 0xDE:
 265         /* Write All Mask Bits (only 4 lower bits are significant */
 266         FIXME("Write All Mask Bits (%x)\n",val);
 267         dmachip = (port==0x0F) ? 0 : 1;
 268         DMA_Mask[dmachip] = val & 0x0F;
 269         break;
 270
 271     case 0x09:
 272     case 0xD2:
 273         /* Software DRQx Request */
 274         FIXME("Software DRQx Request (%x) - Not Implemented\n",val);
 275         break;
 276
 277     case 0x0C:
 278     case 0xD8:
 279         /* Reset DMA Pointer Flip-Flop */
 280         TRACE("Reset Flip-Flop\n");
 281         DMA_Toggle[port==0xD8]=FALSE;
 282         break;
 283
 284     case 0x0D:
 285     case 0xDA:
 286         /* Master Reset */
 287         TRACE("Master Reset\n");
 288         dmachip = (port==0x0D) ? 0 : 1;
 289         /* Reset DMA Pointer Flip-Flop */
 290         DMA_Toggle[dmachip]=FALSE;
 291         /* Mask all channels */
 292         DMA_Mask[dmachip] = 0x0F;
 293         break;
 294
 295     case 0x0E:
 296     case 0xDC:
 297         /* Reset Mask Register */
 298         FIXME("Reset Mask Register\n");
 299         dmachip = (port==0x0E) ? 0 : 1;
 300         /* Unmask all channels */
 301         DMA_Mask[dmachip] = 0x00;
 302         break;
 303     }
 304 }
 305
 306 BYTE DMA_ioport_in( WORD port )
 307 {
 308     int channel,dmachip;
 309     BYTE res = 0;
 310
 311     switch(port)
 312     {
 313     case 0x00:
 314     case 0x02:
 315     case 0x04:
 316     case 0x06:
 317     case 0xC0:
 318     case 0xC4:
 319     case 0xC8:
 320     case 0xCC:
 321         /* Base Address*/
 322         channel = (port&0xC0)?((port-0xC0)>>2):(port>>1);
 323         dmachip = (channel<4) ? 0 : 1;
 324         if (!DMA_Toggle[dmachip])
 325             res = DMA_CurrentBaseAddress[channel] & 0xFF;
 326         else {
 327             res = (DMA_CurrentBaseAddress[channel] & (0xFF << 8))>>8;
 328             TRACE("Read Current Base Address = %x\n",DMA_CurrentBaseAddress[channel]);
 329         }
 330         DMA_Toggle[dmachip] = !DMA_Toggle[dmachip];
 331         break;
 332
 333     case 0x01:
 334     case 0x03:
 335     case 0x05:
 336     case 0x07:
 337     case 0xC2:
 338     case 0xC6:
 339     case 0xCA:
 340     case 0xCE:
 341         /* Count*/
 342         channel = ((port-1)&0xC0)?(((port-1)-0xC0)>>2):(port>>1);
 343         dmachip = (channel<4) ? 0 : 1;
 344         if (!DMA_Toggle[dmachip])
 345             res = DMA_CurrentByteCount[channel];
 346         else {
 347             res = DMA_CurrentByteCount[channel] >> 8;
 348             TRACE("Read Current Count = %x.\n",DMA_CurrentByteCount[channel]);
 349         }
 350         DMA_Toggle[dmachip] = !DMA_Toggle[dmachip];
 351         break;
 352
 353     /* Low Page Base Address */
 354     case 0x87: res = DMA_BaseAddress[0] >> 16; break;
 355     case 0x83: res = DMA_BaseAddress[1] >> 16; break;
 356     case 0x81: res = DMA_BaseAddress[2] >> 16; break;
 357     case 0x82: res = DMA_BaseAddress[3] >> 16; break;
 358     case 0x8B: res = DMA_BaseAddress[5] >> 16; break;
 359     case 0x89: res = DMA_BaseAddress[6] >> 16; break;
 360     case 0x8A: res = DMA_BaseAddress[7] >> 16; break;
 361
 362     /* High Page Base Address */
 363     case 0x487: res = DMA_BaseAddress[0] >> 24; break;
 364     case 0x483: res = DMA_BaseAddress[1] >> 24; break;
 365     case 0x481: res = DMA_BaseAddress[2] >> 24; break;
 366     case 0x482: res = DMA_BaseAddress[3] >> 24; break;
 367     case 0x48B: res = DMA_BaseAddress[5] >> 24; break;
 368     case 0x489: res = DMA_BaseAddress[6] >> 24; break;
 369     case 0x48A: res = DMA_BaseAddress[7] >> 24; break;
 370
 371     case 0x08:
 372     case 0xD0:
 373         /* Status */
 374         TRACE("Status Register Read\n");
 375         res = DMA_Status[(port==0x08)?0:1];
 376         break;
 377
 378     case 0x0D:
 379     case 0xDA:
 380         /* Temporary */
 381         FIXME("Temporary Register Read- Not Implemented\n");
 382         break;
 383     }
 384     return res;
 385 }