Modules/Network/NE2000/ne2000.c

   1 /* Acess2
   2  * NE2000 Driver
   3  *
   4  * See: ~/Sources/bochs/bochs.../iodev/ne2k.cc
   5  */
   6 #define DEBUG   1
   7 #define VERSION ((0<<8)|50)
   8 #include <acess.h>
   9 #include <modules.h>
  10 #include <fs_devfs.h>
  11 #include <drv_pci.h>
  12 #include <tpl_drv_network.h>
  13 #include <semaphore.h>
  14
  15 // === CONSTANTS ===
  16 #define MEM_START       0x40
  17 #define MEM_END         0xC0
  18 #define RX_FIRST        (MEM_START)
  19 #define RX_LAST         (MEM_START+RX_BUF_SIZE-1)
  20 #define RX_BUF_SIZE     0x40
  21 #define TX_FIRST        (MEM_START+RX_BUF_SIZE)
  22 #define TX_LAST         (MEM_END)
  23 #define TX_BUF_SIZE     0x40
  24 #define MAX_PACKET_QUEUE        10
  25
  26 static const struct {
  27         Uint16  Vendor;
  28         Uint16  Device;
  29 } csaCOMPAT_DEVICES[] = {
  30         {0x10EC, 0x8029},       // Realtek 8029
  31         {0x10EC, 0x8129}        // Realtek 8129
  32 };
  33 #define NUM_COMPAT_DEVICES      ((int)(sizeof(csaCOMPAT_DEVICES)/sizeof(csaCOMPAT_DEVICES[0])))
  34
  35 enum eNe2k_Page0Read {
  36         CMD = 0,        //!< the master command register
  37         CLDA0,          //!< Current Local DMA Address 0
  38         CLDA1,          //!< Current Local DMA Address 1
  39         BNRY,           //!< Boundary Pointer (for ringbuffer)
  40         TSR,            //!< Transmit Status Register
  41         NCR,            //!< collisions counter
  42         FIFO,           //!< (for what purpose ??)
  43         ISR,            //!< Interrupt Status Register
  44         CRDA0,          //!< Current Remote DMA Address 0
  45         CRDA1,          //!< Current Remote DMA Address 1
  46         RSR = 0xC       //!< Receive Status Register
  47 };
  48
  49 enum eNe2k_Page0Write {
  50         PSTART = 1,     //!< page start (init only)
  51         PSTOP,          //!< page stop  (init only)
  52         TPSR = 4,       //!< transmit page start address
  53         TBCR0,          //!< transmit byte count (low)
  54         TBCR1,          //!< transmit byte count (high)
  55         RSAR0 = 8,      //!< remote start address (lo)
  56         RSAR1,  //!< remote start address (hi)
  57         RBCR0,  //!< remote byte count (lo)
  58         RBCR1,  //!< remote byte count (hi)
  59         RCR,    //!< receive config register
  60         TCR,    //!< transmit config register
  61         DCR,    //!< data config register    (init)
  62         IMR             //!< interrupt mask register (init)
  63 };
  64
  65 enum eNe2k_Page1Read {
  66         CURR = 7        //!< current page
  67 };
  68
  69 // === TYPES ===
  70 typedef struct sNe2k_Card {
  71         Uint16  IOBase; //!< IO Port Address from PCI
  72         Uint8   IRQ;    //!< IRQ Assigned from PCI
  73
  74         tSemaphore      Semaphore;      //!< Semaphore for incoming packets
  75          int    NextRXPage;     //!< Next expected RX page
  76
  77          int    NextMemPage;    //!< Next Card Memory page to use
  78
  79         char    Name[2];        // "0"
  80         tVFS_Node       Node;   //!< VFS Node
  81         Uint8   MacAddr[6];     //!< Cached MAC address
  82 } tCard;
  83
  84 // === PROTOTYPES ===
  85  int    Ne2k_Install(char **Arguments);
  86 char    *Ne2k_ReadDir(tVFS_Node *Node, int Pos);
  87 tVFS_Node       *Ne2k_FindDir(tVFS_Node *Node, const char *Name);
  88  int    Ne2k_IOCtl(tVFS_Node *Node, int ID, void *Data);
  89 Uint64  Ne2k_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  90 Uint64  Ne2k_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  91
  92  int    Ne2k_int_ReadDMA(tCard *Card, int FirstPage, int NumPages, void *Buffer);
  93 Uint8   Ne2k_int_GetWritePage(tCard *Card, Uint16 Length);
  94 void    Ne2k_IRQHandler(int IntNum);
  95
  96 // === GLOBALS ===
  97 MODULE_DEFINE(0, VERSION, Ne2k, Ne2k_Install, NULL, NULL);
  98 tDevFS_Driver   gNe2k_DriverInfo = {
  99         NULL, "ne2k",
 100         {
 101         .NumACLs = 1,
 102         .ACLs = &gVFS_ACL_EveryoneRX,
 103         .Flags = VFS_FFLAG_DIRECTORY,
 104         .ReadDir = Ne2k_ReadDir,
 105         .FindDir = Ne2k_FindDir,
 106         .IOCtl = Ne2k_IOCtl
 107         }
 108 };
 109 Uint16  gNe2k_BaseAddress;
 110  int    giNe2k_CardCount = 0;
 111 tCard   *gpNe2k_Cards = NULL;
 112
 113 // === CODE ===
 114 /**
 115  * \fn int Ne2k_Install(char **Options)
 116  * \brief Installs the NE2000 Driver
 117  */
 118 int Ne2k_Install(char **Options)
 119 {
 120          int    i, j, k;
 121          int    count, id, base;
 122
 123         // --- Scan PCI Bus ---
 124         // Count Cards
 125         giNe2k_CardCount = 0;
 126         for( i = 0; i < NUM_COMPAT_DEVICES; i ++ )
 127         {
 128                 giNe2k_CardCount += PCI_CountDevices( csaCOMPAT_DEVICES[i].Vendor, csaCOMPAT_DEVICES[i].Device, 0 );
 129         }
 130
 131         if( giNe2k_CardCount == 0 ) {
 132                 Log_Warning("Ne2k", "No cards detected");
 133                 return MODULE_ERR_NOTNEEDED;
 134         }
 135
 136         // Enumerate Cards
 137         k = 0;
 138         gpNe2k_Cards = calloc( giNe2k_CardCount, sizeof(tCard) );
 139
 140         for( i = 0; i < NUM_COMPAT_DEVICES; i ++ )
 141         {
 142                 count = PCI_CountDevices( csaCOMPAT_DEVICES[i].Vendor, csaCOMPAT_DEVICES[i].Device, 0 );
 143                 for( j = 0; j < count; j ++,k ++ )
 144                 {
 145                         id = PCI_GetDevice( csaCOMPAT_DEVICES[i].Vendor, csaCOMPAT_DEVICES[i].Device, 0, j );
 146                         // Create Structure
 147                         base = PCI_AssignPort( id, 0, 0x20 );
 148                         gpNe2k_Cards[ k ].IOBase = base;
 149                         gpNe2k_Cards[ k ].IRQ = PCI_GetIRQ( id );
 150                         gpNe2k_Cards[ k ].NextMemPage = 64;
 151                         gpNe2k_Cards[ k ].NextRXPage = RX_FIRST;
 152
 153                         // Install IRQ Handler
 154                         IRQ_AddHandler(gpNe2k_Cards[ k ].IRQ, Ne2k_IRQHandler);
 155
 156                         // Reset Card
 157                         outb( base + 0x1F, inb(base + 0x1F) );
 158                         while( (inb( base+ISR ) & 0x80) == 0 );
 159                         outb( base + ISR, 0x80 );
 160
 161                         // Initialise Card
 162                         outb( base + CMD, 0x40|0x21 );  // Page 1, No DMA, Stop
 163                         outb( base + CURR, RX_FIRST );  // Current RX page
 164                         outb( base + CMD, 0x21 );       // No DMA and Stop
 165                         outb( base + DCR, 0x49 );       // Set WORD mode
 166                         outb( base + IMR, 0x00 );       // Interrupt Mask Register
 167                         outb( base + ISR, 0xFF );
 168                         outb( base + RCR, 0x20 );       // Reciever to Monitor
 169                         outb( base + TCR, 0x02 );       // Transmitter OFF (TCR.LB = 1, Internal Loopback)
 170
 171                         // Read MAC Address
 172                         outb( base + RBCR0, 6*4 );      // Remote Byte Count
 173                         outb( base + RBCR1, 0 );
 174                         outb( base + RSAR0, 0 );        // Clear Source Address
 175                         outb( base + RSAR1, 0 );
 176                         outb( base + CMD, 0x0A );       // Remote Read, Start
 177                         gpNe2k_Cards[ k ].MacAddr[0] = inb(base+0x10);//        inb(base+0x10);
 178                         gpNe2k_Cards[ k ].MacAddr[1] = inb(base+0x10);//        inb(base+0x10);
 179                         gpNe2k_Cards[ k ].MacAddr[2] = inb(base+0x10);//        inb(base+0x10);
 180                         gpNe2k_Cards[ k ].MacAddr[3] = inb(base+0x10);//        inb(base+0x10);
 181                         gpNe2k_Cards[ k ].MacAddr[4] = inb(base+0x10);//        inb(base+0x10);
 182                         gpNe2k_Cards[ k ].MacAddr[5] = inb(base+0x10);//        inb(base+0x10);
 183
 184                         outb( base+PSTART, RX_FIRST);   // Set Receive Start
 185                         outb( base+BNRY, RX_LAST-1);    // Set Boundary Page
 186                         outb( base+PSTOP, RX_LAST);     // Set Stop Page
 187                         outb( base+ISR, 0xFF ); // Clear all ints
 188                         outb( base+CMD, 0x22 ); // No DMA, Start
 189                         outb( base+IMR, 0x3F ); // Set Interupt Mask
 190                         outb( base+RCR, 0x0F ); // Set WRAP and allow all packet matches
 191                         outb( base+TCR, 0x00 ); // Set Normal Transmitter mode
 192                         outb( base+TPSR, 0x40); // Set Transmit Start
 193
 194                         Log_Log("Ne2k", "Card %i 0x%04x IRQ%i %02x:%02x:%02x:%02x:%02x:%02x",
 195                                 k, base, gpNe2k_Cards[ k ].IRQ,
 196                                 gpNe2k_Cards[k].MacAddr[0], gpNe2k_Cards[k].MacAddr[1],
 197                                 gpNe2k_Cards[k].MacAddr[2], gpNe2k_Cards[k].MacAddr[3],
 198                                 gpNe2k_Cards[k].MacAddr[4], gpNe2k_Cards[k].MacAddr[5]
 199                                 );
 200
 201                         // Set VFS Node
 202                         gpNe2k_Cards[ k ].Name[0] = '0'+k;
 203                         gpNe2k_Cards[ k ].Name[1] = '\0';
 204                         gpNe2k_Cards[ k ].Node.ImplPtr = &gpNe2k_Cards[ k ];
 205                         gpNe2k_Cards[ k ].Node.NumACLs = 0;     // Root Only
 206                         gpNe2k_Cards[ k ].Node.CTime = now();
 207                         gpNe2k_Cards[ k ].Node.Write = Ne2k_Write;
 208                         gpNe2k_Cards[ k ].Node.Read = Ne2k_Read;
 209                         gpNe2k_Cards[ k ].Node.IOCtl = Ne2k_IOCtl;
 210
 211                         // Initialise packet semaphore
 212                         // - Start at zero, no max
 213                         Semaphore_Init( &gpNe2k_Cards[k].Semaphore, 0, 0, "NE2000", gpNe2k_Cards[ k ].Name );
 214                 }
 215         }
 216
 217         gNe2k_DriverInfo.RootNode.Size = giNe2k_CardCount;
 218         DevFS_AddDevice( &gNe2k_DriverInfo );
 219         return MODULE_ERR_OK;
 220 }
 221
 222 /**
 223  * \fn char *Ne2k_ReadDir(tVFS_Node *Node, int Pos)
 224  */
 225 char *Ne2k_ReadDir(tVFS_Node *Node, int Pos)
 226 {
 227         char    ret[2];
 228         if(Pos < 0 || Pos >= giNe2k_CardCount)  return NULL;
 229         ret[0] = '0'+Pos;
 230         ret[1] = '\0';
 231         return strdup(ret);
 232 }
 233
 234 /**
 235  * \fn tVFS_Node *Ne2k_FindDir(tVFS_Node *Node, const char *Name)
 236  */
 237 tVFS_Node *Ne2k_FindDir(tVFS_Node *Node, const char *Name)
 238 {
 239         if(Name[0] == '\0' || Name[1] != '\0')  return NULL;
 240
 241         return &gpNe2k_Cards[ Name[0]-'0' ].Node;
 242 }
 243
 244 static const char *casIOCtls[] = { DRV_IOCTLNAMES, DRV_NETWORK_IOCTLNAMES, NULL };
 245 /**
 246  * \fn int Ne2k_IOCtl(tVFS_Node *Node, int ID, void *Data)
 247  * \brief IOCtl calls for a network device
 248  */
 249 int Ne2k_IOCtl(tVFS_Node *Node, int ID, void *Data)
 250 {
 251         ENTER("pNode iID pData", Node, ID, Data);
 252         switch( ID )
 253         {
 254         BASE_IOCTLS(DRV_TYPE_NETWORK, "NE2000", VERSION, casIOCtls);
 255         }
 256
 257         // If this is the root, return
 258         if( Node == &gNe2k_DriverInfo.RootNode ) {
 259                 LEAVE('i', 0);
 260                 return 0;
 261         }
 262
 263         // Device specific settings
 264         switch( ID )
 265         {
 266         case NET_IOCTL_GETMAC:
 267                 if( !CheckMem(Data, 6) ) {
 268                         LEAVE('i', -1);
 269                         return -1;
 270                 }
 271                 memcpy( Data, ((tCard*)Node->ImplPtr)->MacAddr, 6 );
 272                 LEAVE('i', 1);
 273                 return 1;
 274         }
 275         LEAVE('i', 0);
 276         return 0;
 277 }
 278
 279 /**
 280  * \fn Uint64 Ne2k_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 281  * \brief Send a packet from the network card
 282  */
 283 Uint64 Ne2k_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 284 {
 285         tCard   *Card = (tCard*)Node->ImplPtr;
 286         Uint16  *buf = Buffer;
 287          int    rem = Length;
 288          int    page;
 289
 290         ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
 291
 292         // TODO: Lock
 293
 294         // Sanity Check Length
 295         if(Length > TX_BUF_SIZE*256) {
 296                 Log_Warning(
 297                         "Ne2k",
 298                         "Ne2k_Write - Attempting to send over TX_BUF_SIZE*256 (%i) bytes (%i)",
 299                         TX_BUF_SIZE*256, Length
 300                         );
 301                 LEAVE('i', 0);
 302                 return 0;
 303         }
 304
 305         // Make sure that the card is in page 0
 306         outb(Card->IOBase + CMD, 0|0x22);       // Page 0, Start, NoDMA
 307
 308         // Clear Remote DMA Flag
 309         outb(Card->IOBase + ISR, 0x40); // Bit 6
 310
 311         // Send Size - Transfer Byte Count Register
 312         outb(Card->IOBase + TBCR0, Length & 0xFF);
 313         outb(Card->IOBase + TBCR1, Length >> 8);
 314
 315         // Send Size - Remote Byte Count Register
 316         outb(Card->IOBase + RBCR0, Length & 0xFF);
 317         outb(Card->IOBase + RBCR1, Length >> 8);
 318
 319         // Set up transfer
 320         outb(Card->IOBase + RSAR0, 0x00);       // Page Offset
 321         page = Ne2k_int_GetWritePage(Card, Length);
 322         outb(Card->IOBase + RSAR1, page);       // Page Offset
 323         // Start
 324         outb(Card->IOBase + CMD, 0|0x10|0x2);   // Page 0, Remote Write, Start
 325
 326         // Send Data
 327         for(rem = Length; rem > 0; rem -= 2) {
 328                 outw(Card->IOBase + 0x10, *buf++);
 329         }
 330
 331         while( !(inb(Card->IOBase + ISR) & 0x40) )      // Wait for Remote DMA Complete
 332                 ;       //Proc_Yield();
 333
 334         outb( Card->IOBase + ISR, 0x40 );       // ACK Interrupt
 335
 336         // Send Packet
 337         outb(Card->IOBase + TPSR, page);
 338         outb(Card->IOBase + CMD, 0|0x10|0x4|0x2);
 339
 340         // Complete DMA
 341         //outb(Card->IOBase + CMD, 0|0x20);
 342
 343         LEAVE('i', Length);
 344         return Length;
 345 }
 346
 347 /**
 348  * \fn Uint64 Ne2k_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 349  * \brief Wait for and read a packet from the network card
 350  */
 351 Uint64 Ne2k_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 352 {
 353         tCard   *Card = (tCard*)Node->ImplPtr;
 354         Uint8   page;
 355         Uint8   data[256];
 356         struct {
 357                 Uint8   Status;
 358                 Uint8   NextPacketPage;
 359                 Uint16  Length; // Little Endian
 360         }       *pktHdr;
 361
 362         ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
 363
 364         // Wait for packets
 365         if( Semaphore_Wait( &Card->Semaphore, 1 ) != 1 )
 366         {
 367                 // Error or interrupted
 368                 LEAVE_RET('i', 0);
 369         }
 370
 371         outb(Card->IOBase, 0x22 | (1 << 6));    // Page 6
 372         LOG("CURR : 0x%02x", inb(Card->IOBase + CURR));
 373
 374         // Get current read page
 375         page = Card->NextRXPage;
 376         LOG("page = %i", page);
 377
 378         Ne2k_int_ReadDMA(Card, page, 1, data);
 379
 380         pktHdr = (void*)data;
 381
 382         LOG("pktHdr->Status = 0x%x", pktHdr->Status);
 383         LOG("pktHdr->NextPacketPage = %i", pktHdr->NextPacketPage);
 384         LOG("pktHdr->Length = 0x%03x", pktHdr->Length);
 385
 386         // Have we read all the required bytes yet?
 387         if(pktHdr->Length < 256 - 4)
 388         {
 389                 if(Length > pktHdr->Length)
 390                         Length = pktHdr->Length;
 391                 memcpy(Buffer, &data[4], Length);
 392         }
 393         // No? oh damn, now we need to allocate a buffer
 394         else
 395         {
 396                  int    pages = pktHdr->NextPacketPage - page;
 397                 char    *buf = malloc( pages*256 );
 398
 399                 LOG("pktHdr->Length (%i) > 256 - 4, allocated buffer %p", pktHdr->Length, buf);
 400
 401                 if(!buf)        LEAVE_RET('i', -1);
 402
 403                 // Copy the already read data
 404                 memcpy(buf, data, 256);
 405
 406                 // Read all the needed pages
 407                 page ++;
 408                 if(page == RX_LAST+1)   page = RX_FIRST;
 409
 410                 if( page + pages > RX_LAST )
 411                 {
 412                          int    first_count = RX_LAST+1 - page;
 413                          int    tmp = 0;
 414                         tmp += Ne2k_int_ReadDMA(Card, page, first_count, buf+256);
 415                         tmp += Ne2k_int_ReadDMA(Card, RX_FIRST, pages-1-first_count, buf+(first_count+1)*256);
 416                         LOG("composite return count = %i", tmp);
 417                 }
 418                 else
 419                         Ne2k_int_ReadDMA(Card, page, pages-1, buf+256);
 420
 421                 // Wrap length to the packet length
 422                 if(Length > pktHdr->Length)
 423                         Length = pktHdr->Length;
 424                 else if( Length < pktHdr->Length ) {
 425                         Log_Warning("NE2000", "Packet truncated! (%i bytes truncated to %i)",
 426                                 pktHdr->Length, Length);
 427                 }
 428                 memcpy(Buffer, &buf[4], Length);
 429
 430                 free(buf);
 431         }
 432
 433         // Write BNRY (maximum page for incoming packets)
 434         if(pktHdr->NextPacketPage == RX_FIRST)
 435                 outb( Card->IOBase + BNRY, RX_LAST-1 );
 436         else
 437                 outb( Card->IOBase + BNRY, pktHdr->NextPacketPage-1 );
 438         // Set next RX Page and decrement the waiting list
 439         Card->NextRXPage = pktHdr->NextPacketPage;
 440
 441         LEAVE('i', Length);
 442         return Length;
 443 }
 444
 445 int Ne2k_int_ReadDMA(tCard *Card, int FirstPage, int NumPages, void *Buffer)
 446 {
 447          int    i;
 448
 449         // Sanity check
 450         if( !(0 <= FirstPage && FirstPage < 256) ) {
 451                 Log_Warning("NE2000", "Ne2k_int_ReadDMA: BUG - FirstPage(%i) not 8-bit", FirstPage);
 452                 return -1;
 453         }
 454         if( !(0 <= NumPages && NumPages < 256) ) {
 455                 Log_Warning("NE2000", "Ne2k_int_ReadDMA: BUG - NumPages(%i) not 8-bit", NumPages);
 456                 return -1;
 457         }
 458
 459         ENTER("pCard iFirstPage iNumPages pBuffer", Card, FirstPage, NumPages, Buffer);
 460
 461         // Make sure that the card is in bank 0
 462         outb(Card->IOBase + CMD, 0|0x22);       // Bank 0, Start, NoDMA
 463         outb(Card->IOBase + ISR, 0x40); // Clear Remote DMA Flag
 464
 465         // Set up transfer
 466         outb(Card->IOBase + RBCR0, 0);
 467         outb(Card->IOBase + RBCR1, NumPages);   // page count
 468         outb(Card->IOBase + RSAR0, 0x00);       // Page Offset
 469         outb(Card->IOBase + RSAR1, FirstPage);  // Page Number
 470         outb(Card->IOBase + CMD, 0|0x08|0x2);   // Bank 0, Remote Read, Start
 471
 472         // TODO: Less expensive
 473         //while( !(inb(Card->IOBase + ISR) & 0x40) ) {
 474         //      HALT();
 475         //      LOG("inb(ISR) = 0x%02x", inb(Card->IOBase + ISR));
 476         //}
 477         HALT(); // Small delay?
 478
 479         // Read data
 480         for(i = 0; i < 128*NumPages; i ++)
 481                 ((Uint16*)Buffer)[i] = inw(Card->IOBase + 0x10);
 482
 483
 484         outb(Card->IOBase + ISR, 0x40); // Clear Remote DMA Flag
 485
 486         LEAVE('i', NumPages);
 487         return NumPages;
 488 }
 489
 490 /**
 491  * \fn Uint8 Ne2k_int_GetWritePage(tCard *Card, Uint16 Length)
 492  */
 493 Uint8 Ne2k_int_GetWritePage(tCard *Card, Uint16 Length)
 494 {
 495         Uint8   ret = Card->NextMemPage;
 496
 497         Card->NextMemPage += (Length + 0xFF) >> 8;
 498         if(Card->NextMemPage >= TX_LAST) {
 499                 Card->NextMemPage -= TX_BUF_SIZE;
 500         }
 501
 502         return ret;
 503 }
 504
 505 /**
 506  * \fn void Ne2k_IRQHandler(int IntNum)
 507  */
 508 void Ne2k_IRQHandler(int IntNum)
 509 {
 510          int    i;
 511         Uint8   byte;
 512         for( i = 0; i < giNe2k_CardCount; i++ )
 513         {
 514                 if(gpNe2k_Cards[i].IRQ == IntNum)
 515                 {
 516                         byte = inb( gpNe2k_Cards[i].IOBase + ISR );
 517
 518                         LOG("byte = 0x%02x", byte);
 519
 520
 521                         // Reset All (save for RDMA), that's polled
 522                         outb( gpNe2k_Cards[i].IOBase + ISR, 0xFF&(~0x40) );
 523
 524                         // 0: Packet recieved (no error)
 525                         if( byte & 1 )
 526                         {
 527                                 //if( gpNe2k_Cards[i].NumWaitingPackets > MAX_PACKET_QUEUE )
 528                                 //      gpNe2k_Cards[i].NumWaitingPackets = MAX_PACKET_QUEUE;
 529                                 if( Semaphore_Signal( &gpNe2k_Cards[i].Semaphore, 1 ) != 1 ) {
 530                                         // Oops?
 531                                 }
 532                         }
 533                         // 1: Packet sent (no error)
 534                         // 2: Recieved with error
 535                         // 3: Transmission Halted (Excessive Collisions)
 536                         // 4: Recieve Buffer Exhausted
 537                         // 5:
 538                         // 6: Remote DMA Complete
 539                         // 7: Reset
 540
 541                         return ;
 542                 }
 543         }
 544         Log_Warning("Ne2k", "Recieved Unknown IRQ %i", IntNum);
 545 }