riointr.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

  */

  intCount++;

  TtyP = PortP->gs.tty;
  if (!TtyP) {
    rio_dprintk (RIO_DEBUG_INTR, "RIOReceive: tty is null. \n");
    return;
  }

  if (PortP->State & RIO_THROTTLE_RX) {
    rio_dprintk (RIO_DEBUG_INTR, "RIOReceive: Throttled. Can't handle more input.\n");
    return;
  }

  if ( PortP->State & RIO_DELETED )
    {
      while ( can_remove_receive( &PacketP, PortP ) )
	{
	  remove_receive( PortP );
	  put_free_end( PortP->HostP, PacketP );
	}
    }
  else
    {
      /*
      ** loop, just so long as:
      **   i ) there's some data ( i.e. can_remove_receive )
      **  ii ) we haven't been blocked
      ** iii ) there's somewhere to put the data
      **  iv ) we haven't outstayed our welcome
      */
      transCount = 1;
      while ( can_remove_receive(&PacketP, PortP)
	      && transCount)
	{
#ifdef STATS
	  PortP->Stat.RxIntCnt++;
#endif /* STATS */
	  RxIntCnt++;

	  /*
	  ** check that it is not a command!
	  */
	  if ( PacketP->len & PKT_CMD_BIT ) {
	    rio_dprintk (RIO_DEBUG_INTR, "RIO: unexpected command packet received on PHB\n");
	    /*	    rio_dprint(RIO_DEBUG_INTR, (" sysport   = %d\n", p->RIOPortp->PortNum)); */
	    rio_dprintk (RIO_DEBUG_INTR, " dest_unit = %d\n", PacketP->dest_unit);
	    rio_dprintk (RIO_DEBUG_INTR, " dest_port = %d\n", PacketP->dest_port);
	    rio_dprintk (RIO_DEBUG_INTR, " src_unit  = %d\n", PacketP->src_unit);
	    rio_dprintk (RIO_DEBUG_INTR, " src_port  = %d\n", PacketP->src_port);
	    rio_dprintk (RIO_DEBUG_INTR, " len	   = %d\n", PacketP->len);
	    rio_dprintk (RIO_DEBUG_INTR, " control   = %d\n", PacketP->control);
	    rio_dprintk (RIO_DEBUG_INTR, " csum	   = %d\n", PacketP->csum);
	    rio_dprintk (RIO_DEBUG_INTR, "	 data bytes: ");
	    for ( DataCnt=0; DataCnt<PKT_MAX_DATA_LEN; DataCnt++ )
	      rio_dprintk (RIO_DEBUG_INTR, "%d\n", PacketP->data[DataCnt]);
	    remove_receive( PortP );
	    put_free_end( PortP->HostP, PacketP );
	    continue; /* with next packet */
	  }

	  /*
	  ** How many characters can we move 'upstream' ?
	  **
	  ** Determine the minimum of the amount of data
	  ** available and the amount of space in which to
	  ** put it.
	  **
	  ** 1.	Get the packet length by masking 'len'
	  **	for only the length bits.
	  ** 2.	Available space is [buffer size] - [space used]
	  **
	  ** Transfer count is the minimum of packet length
	  ** and available space.
	  */
			
	  transCount = min_t(unsigned int, PacketP->len & PKT_LEN_MASK,
			   TTY_FLIPBUF_SIZE - TtyP->flip.count);
	  rio_dprintk (RIO_DEBUG_REC,  "port %d: Copy %d bytes\n", 
				      PortP->PortNum, transCount);
	  /*
	  ** To use the following 'kkprintfs' for debugging - change the '#undef'
	  ** to '#define', (this is the only place ___DEBUG_IT___ occurs in the
	  ** driver).
	  */
#undef ___DEBUG_IT___
#ifdef ___DEBUG_IT___
	  kkprintf("I:%d R:%d P:%d Q:%d C:%d F:%x ",
		   intCount,
		   RxIntCnt,
		   PortP->PortNum,
		   TtyP->rxqueue.count,
		   transCount,
		   TtyP->flags );
#endif
	  ptr = (uchar *) PacketP->data + PortP->RxDataStart;

	  rio_memcpy_fromio (TtyP->flip.char_buf_ptr, ptr, transCount);
	  memset(TtyP->flip.flag_buf_ptr, TTY_NORMAL, transCount);

#ifdef STATS
	  /*
	  ** keep a count for statistical purposes
	  */
	  PortP->Stat.RxCharCnt	+= transCount;
#endif
	  PortP->RxDataStart	+= transCount;
	  PacketP->len		-= transCount;
	  copied += transCount;
	  TtyP->flip.count += transCount;
	  TtyP->flip.char_buf_ptr += transCount;
	  TtyP->flip.flag_buf_ptr += transCount;


#ifdef ___DEBUG_IT___
	  kkprintf("T:%d L:%d\n", DataCnt, PacketP->len );
#endif

	  if ( PacketP->len == 0 )
	    {
				/*
				** If we have emptied the packet, then we can
				** free it, and reset the start pointer for
				** the next packet.
				*/
	      remove_receive( PortP );
	      put_free_end( PortP->HostP, PacketP );
	      PortP->RxDataStart = 0;
#ifdef STATS
				/*
				** more lies ( oops, I mean statistics )
				*/
	      PortP->Stat.RxPktCnt++;
#endif /* STATS */
	    }
	}
    }
  if (copied) {
    rio_dprintk (RIO_DEBUG_REC, "port %d: pushing tty flip buffer: %d total bytes copied.\n", PortP->PortNum, copied);
    tty_flip_buffer_push (TtyP);
  }

  return;
}

#ifdef FUTURE_RELEASE
/*
** The proc routine called by the line discipline to do the work for it.
** The proc routine works hand in hand with the interrupt routine.
*/
int
riotproc(p, tp, cmd, port)
struct rio_info *	p;
register struct ttystatics *tp;
int cmd;
int	port;
{
	register struct Port *PortP;
	int SysPort;
	struct PKT *PacketP;

	SysPort = port;	/* Believe me, it works. */

	if ( SysPort < 0 || SysPort >= RIO_PORTS ) {
		rio_dprintk (RIO_DEBUG_INTR, "Illegal port %d derived from TTY in riotproc()\n",SysPort);
		return 0;
	}
	PortP = p->RIOPortp[SysPort];

	if ((uint)PortP->PhbP < (uint)PortP->Caddr || 
			(uint)PortP->PhbP >= (uint)PortP->Caddr+SIXTY_FOUR_K ) {
		rio_dprintk (RIO_DEBUG_INTR, "RIO: NULL or BAD PhbP on sys port %d in proc routine\n",
							SysPort);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP = 0x%x\n",PortP);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP->PhbP = 0x%x\n",PortP->PhbP);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP->Caddr = 0x%x\n",PortP->PhbP);
		rio_dprintk (RIO_DEBUG_INTR, "	 PortP->HostPort = 0x%x\n",PortP->HostPort);
		return 0;
	}

	switch(cmd) {
		case T_WFLUSH:
			rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH\n");
			/*
			** Because of the spooky way the RIO works, we don't need
			** to issue a flush command on any of the SET*F commands,
			** as that causes trouble with getty and login, which issue
			** these commands to incur a READ flush, and rely on the fact
			** that the line discipline does a wait for drain for them.
			** As the rio doesn't wait for drain, the write flush would
			** destroy the Password: prompt. This isn't very friendly, so
			** here we only issue a WFLUSH command if we are in the interrupt
			** routine, or we aren't executing a SET*F command.
			*/
			if ( PortP->HostP->InIntr || !PortP->FlushCmdBodge ) {
				/*
				** form a wflush packet - 1 byte long, no data
				*/
				if ( PortP->State & RIO_DELETED ) {
					rio_dprintk (RIO_DEBUG_INTR, "WFLUSH on deleted RTA\n");
				}
				else {
					if ( RIOPreemptiveCmd(p, PortP, WFLUSH ) == RIO_FAIL ) {
						rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH Command failed\n");
					}
					else
						rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH Command\n");
				}
				/*
				** WFLUSH operation - flush the data!
				*/
				PortP->TxBufferIn = PortP->TxBufferOut = 0;
			}
			else {
				rio_dprintk (RIO_DEBUG_INTR, "T_WFLUSH Command ignored\n");
			}
			/*
			** sort out the line discipline
			*/
			if (PortP->CookMode == COOK_WELL)
				goto start;
			break;
	
		case T_RESUME:
			rio_dprintk (RIO_DEBUG_INTR, "T_RESUME\n");
			/*
			** send pre-emptive resume packet
			*/
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "RESUME on deleted RTA\n");
			}
			else {
				if ( RIOPreemptiveCmd(p, PortP, RESUME ) == RIO_FAIL ) {
					rio_dprintk (RIO_DEBUG_INTR, "T_RESUME Command failed\n");
				}
			}
			/*
			** and re-start the sender software!
			*/
			if (PortP->CookMode == COOK_WELL)
				goto start;
			break;
	
		case T_TIME:
			rio_dprintk (RIO_DEBUG_INTR, "T_TIME\n");
			/*
			** T_TIME is called when xDLY is set in oflags and
			** the line discipline timeout has expired. It's
			** function in life is to clear the TIMEOUT flag
			** and to re-start output to the port.
			*/
			/*
			** Fall through and re-start output
			*/
		case T_OUTPUT:
start:
			if ( PortP->MagicFlags & MAGIC_FLUSH ) {
				PortP->MagicFlags |= MORE_OUTPUT_EYGOR;
				return 0;
			}
			RIOTxEnable((char *)PortP);
			PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR;
			/*rio_dprint(RIO_DEBUG_INTR, PortP,DBG_PROC,"T_OUTPUT finished\n");*/
			break;
	
		case T_SUSPEND:
			rio_dprintk (RIO_DEBUG_INTR, "T_SUSPEND\n");
			/*
			** send a suspend pre-emptive packet.
			*/
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "SUSPEND deleted RTA\n");
			}
			else {
				if ( RIOPreemptiveCmd(p, PortP, SUSPEND ) == RIO_FAIL ) {
					rio_dprintk (RIO_DEBUG_INTR, "T_SUSPEND Command failed\n");
				}
			}
			/*
			** done!
			*/
			break;
	
		case T_BLOCK:
			rio_dprintk (RIO_DEBUG_INTR, "T_BLOCK\n");
			break;
	
		case T_RFLUSH:
			rio_dprintk (RIO_DEBUG_INTR, "T_RFLUSH\n");
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "RFLUSH on deleted RTA\n");
				PortP->RxDataStart = 0;
			}
			else {
				if ( RIOPreemptiveCmd( p, PortP, RFLUSH ) == RIO_FAIL ) {
					rio_dprintk (RIO_DEBUG_INTR, "T_RFLUSH Command failed\n");
					return 0;
				}
				PortP->RxDataStart = 0;
				while ( can_remove_receive(&PacketP, PortP) ) {
					remove_receive(PortP);
					ShowPacket(DBG_PROC, PacketP );
					put_free_end(PortP->HostP, PacketP );
				}
				if ( PortP->PhbP->handshake == PHB_HANDSHAKE_SET ) {
					/*
					** MAGIC!
					*/
					rio_dprintk (RIO_DEBUG_INTR, "Set receive handshake bit\n");
					PortP->PhbP->handshake |= PHB_HANDSHAKE_RESET;
				}
			}
			break;
			/* FALLTHROUGH */
		case T_UNBLOCK:
			rio_dprintk (RIO_DEBUG_INTR, "T_UNBLOCK\n");
			/*
			** If there is any data to receive set a timeout to service it.
			*/
			RIOReceive(p, PortP);
			break;
	
		case T_BREAK:
			rio_dprintk (RIO_DEBUG_INTR, "T_BREAK\n");
			/*
			** Send a break command. For Sys V
			** this is a timed break, so we
			** send a SBREAK[time] packet
			*/
			/*
			** Build a BREAK command
			*/
			if ( PortP->State & RIO_DELETED ) {
				rio_dprintk (RIO_DEBUG_INTR, "BREAK on deleted RTA\n");
			}
			else {
				if (RIOShortCommand(PortP,SBREAK,2,
								p->RIOConf.BreakInterval)==RIO_FAIL) {
			   		rio_dprintk (RIO_DEBUG_INTR, "SBREAK RIOShortCommand failed\n");
				}
			}
	
			/*
			** done!
			*/
			break;
	
		case T_INPUT:
			rio_dprintk (RIO_DEBUG_INTR, "Proc T_INPUT called - I don't know what to do!\n");
			break;
		case T_PARM:
			rio_dprintk (RIO_DEBUG_INTR, "Proc T_PARM called - I don't know what to do!\n");
			break;
	
		case T_SWTCH:
			rio_dprintk (RIO_DEBUG_INTR, "Proc T_SWTCH called - I don't know what to do!\n");
			break;
	
		default:
			rio_dprintk (RIO_DEBUG_INTR, "Proc UNKNOWN command %d\n",cmd);
	}
	/*
	** T_OUTPUT returns without passing through this point!
	*/
	/*rio_dprint(RIO_DEBUG_INTR, PortP,DBG_PROC,"riotproc done\n");*/
	return(0);
}
#endif