C++ rio_dprintk函数代码示例

int RIOFoadRta(struct Host *HostP, struct Map *MapP)
{
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA\n");

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = MapP->ID;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = IFOAD;
	CmdBlkP->Packet.data[1] = 0;
	CmdBlkP->Packet.data[2] = IFOAD_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (IFOAD_MAGIC >> 8) & 0xFF;

	if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
		rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: Failed to queue foad command\n");
		return -EIO;
	}
	return 0;
}

int RIOSuspendBootRta(struct Host *HostP, int ID, int Link)
{
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA ID %d, link %c\n", ID, 'A' + Link);

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = ID;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = IWAIT;
	CmdBlkP->Packet.data[1] = Link;
	CmdBlkP->Packet.data[2] = IWAIT_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (IWAIT_MAGIC >> 8) & 0xFF;

	if (RIOQueueCmdBlk(HostP, ID - 1, CmdBlkP) == RIO_FAIL) {
		rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: Failed to queue iwait command\n");
		return -EIO;
	}
	return 0;
}

/****************************************
 * Put a packet onto the end of the
 * free list
 ****************************************/
void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
{
    struct rio_free_list __iomem *tmp_pointer;
    unsigned short old_end, new_end;
    unsigned long flags;

    rio_spin_lock_irqsave(&HostP->HostLock, flags);

     /*************************************************
    * Put a packet back onto the back of the free list
    *
    ************************************************/

    rio_dprintk(RIO_DEBUG_PFE, "put_free_end(PktP=%p)\n", PktP);

    if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
        new_end = RIO_OFF(HostP->Caddr, PktP);
        tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
        writew(new_end, &tmp_pointer->next);
        writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
        writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
        writew(new_end, &HostP->ParmMapP->free_list_end);
    } else {        /* First packet on the free list this should never happen! */
        rio_dprintk(RIO_DEBUG_PFE, "put_free_end(): This should never happen\n");
        writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
        tmp_pointer = (struct rio_free_list __iomem *) PktP;
        writew(TPNULL, &tmp_pointer->prev);
        writew(TPNULL, &tmp_pointer->next);
    }
    rio_dprintk(RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock);
    rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
}

/*
** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
** and then move the TxAdd pointer along one position to point to the next
** packet pointer. You must wrap the pointer from the end back to the start.
*/
void add_transmit(struct Port *PortP)
{
    if (readw(PortP->TxAdd) & PKT_IN_USE) {
        rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
    }
    writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
    PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
    writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
}

int RIOCommandRta(struct rio_info *p, unsigned long RtaUnique, int (*func) (struct Host * HostP, struct Map * MapP))
{
	unsigned int Host;

	rio_dprintk(RIO_DEBUG_CMD, "Command RTA 0x%lx func %p\n", RtaUnique, func);

	if (!RtaUnique)
		return (0);

	for (Host = 0; Host < p->RIONumHosts; Host++) {
		unsigned int Rta;
		struct Host *HostP = &p->RIOHosts[Host];

		for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
			struct Map *MapP = &HostP->Mapping[Rta];

			if (MapP->RtaUniqueNum == RtaUnique) {
				uint Link;

				/*
				 ** now, lets just check we have a route to it...
				 ** IF the routing stuff is working, then one of the
				 ** topology entries for this unit will have a legit
				 ** route *somewhere*. We care not where - if its got
				 ** any connections, we can get to it.
				 */
				for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
					if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
						/*
						 ** Its worth trying the operation...
						 */
						return (*func) (HostP, MapP);
					}
				}
			}
		}
	}
	return -ENXIO;
}

int RIOUnUse(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);

	rio_dprintk(RIO_DEBUG_CMD, "Decrement in use count for port\n");

	if (PortP->InUse) {
		if (--PortP->InUse != NOT_INUSE) {
			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
			return 0;
		}
	}
	/*
	 ** While PortP->InUse is set (i.e. a preemptive command has been sent to
	 ** the RTA and is awaiting completion), any transmit data is prevented from
	 ** being transferred from the write queue into the transmit packets
	 ** (add_transmit) and no furthur transmit interrupt will be sent for that
	 ** data. The next interrupt will occur up to 500ms later (RIOIntr is called
	 ** twice a second as a saftey measure). This was the case when kermit was
	 ** used to send data into a RIO port. After each packet was sent, TCFLSH
	 ** was called to flush the read queue preemptively. PortP->InUse was
	 ** incremented, thereby blocking the 6 byte acknowledgement packet
	 ** transmitted back. This acknowledgment hung around for 500ms before
	 ** being sent, thus reducing input performance substantially!.
	 ** When PortP->InUse becomes NOT_INUSE, we must ensure that any data
	 ** hanging around in the transmit buffer is sent immediately.
	 */
	writew(1, &PortP->HostP->ParmMapP->tx_intr);
	/* What to do here ..
	   wakeup( (caddr_t)&(PortP->InUse) );
	 */
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return 0;
}

int RIORFlushEnable(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
	struct Port *PortP = (struct Port *) iPortP;
	struct PKT __iomem *PacketP;
	unsigned long flags;

	rio_spin_lock_irqsave(&PortP->portSem, flags);

	while (can_remove_receive(&PacketP, PortP)) {
		remove_receive(PortP);
		put_free_end(PortP->HostP, PacketP);
	}

	if (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET) {
		/*
		 ** MAGIC! (Basically, handshake the RX buffer, so that
		 ** the RTAs upstream can be re-enabled.)
		 */
		rio_dprintk(RIO_DEBUG_CMD, "Util: Set RX handshake bit\n");
		writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
	}
	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
	return RIOUnUse(iPortP, CmdBlkP);
}

int RIOIdentifyRta(struct rio_info *p, void __user * arg)
{
	unsigned int Host;

	if (copy_from_user(&IdRta, arg, sizeof(IdRta))) {
		rio_dprintk(RIO_DEBUG_CMD, "RIO_IDENTIFY_RTA copy failed\n");
		p->RIOError.Error = COPYIN_FAILED;
		return -EFAULT;
	}

	for (Host = 0; Host < p->RIONumHosts; Host++) {
		unsigned int Rta;
		struct Host *HostP = &p->RIOHosts[Host];

		for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
			struct Map *MapP = &HostP->Mapping[Rta];

			if (MapP->RtaUniqueNum == IdRta.RtaUnique) {
				uint Link;
				/*
				 ** now, lets just check we have a route to it...
				 ** IF the routing stuff is working, then one of the
				 ** topology entries for this unit will have a legit
				 ** route *somewhere*. We care not where - if its got
				 ** any connections, we can get to it.
				 */
				for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
					if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
						/*
						 ** Its worth trying the operation...
						 */
						struct CmdBlk *CmdBlkP;

						rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA\n");

						CmdBlkP = RIOGetCmdBlk();

						if (!CmdBlkP) {
							rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: GetCmdBlk failed\n");
							return -ENXIO;
						}

						CmdBlkP->Packet.dest_unit = MapP->ID;
						CmdBlkP->Packet.dest_port = BOOT_RUP;
						CmdBlkP->Packet.src_unit = 0;
						CmdBlkP->Packet.src_port = BOOT_RUP;
						CmdBlkP->Packet.len = 0x84;
						CmdBlkP->Packet.data[0] = IDENTIFY;
						CmdBlkP->Packet.data[1] = 0;
						CmdBlkP->Packet.data[2] = IdRta.ID;

						if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
							rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: Failed to queue command\n");
							return -EIO;
						}
						return 0;
					}
				}
			}
		}
	}
	return -ENOENT;
}

/*
** attach a command block to the list of commands to be performed for
** a given rup.
*/
int RIOQueueCmdBlk(struct Host *HostP, uint Rup, struct CmdBlk *CmdBlkP)
{
	struct CmdBlk **Base;
	struct UnixRup *UnixRupP;
	unsigned long flags;

	if (Rup >= (unsigned short) (MAX_RUP + LINKS_PER_UNIT)) {
		rio_dprintk(RIO_DEBUG_CMD, "Illegal rup number %d in RIOQueueCmdBlk\n", Rup);
		RIOFreeCmdBlk(CmdBlkP);
		return RIO_FAIL;
	}

	UnixRupP = &HostP->UnixRups[Rup];

	rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);

	/*
	 ** If the RUP is currently inactive, then put the request
	 ** straight on the RUP....
	 */
	if ((UnixRupP->CmdsWaitingP == NULL) && (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE) && (CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP)
																	     : 1)) {
		rio_dprintk(RIO_DEBUG_CMD, "RUP inactive-placing command straight on. Cmd byte is 0x%x\n", CmdBlkP->Packet.data[0]);

		/*
		 ** Whammy! blat that pack!
		 */
		HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));

		/*
		 ** place command packet on the pending position.
		 */
		UnixRupP->CmdPendingP = CmdBlkP;

		/*
		 ** set the command register
		 */
		writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

		rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

		return 0;
	}
	rio_dprintk(RIO_DEBUG_CMD, "RUP active - en-queing\n");

	if (UnixRupP->CmdsWaitingP != NULL)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command waiting\n");
	if (UnixRupP->CmdPendingP != NULL)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command pending\n");
	if (readw(&UnixRupP->RupP->txcontrol) != TX_RUP_INACTIVE)
		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command rup not ready\n");

	Base = &UnixRupP->CmdsWaitingP;

	rio_dprintk(RIO_DEBUG_CMD, "First try to queue cmdblk %p at %p\n", CmdBlkP, Base);

	while (*Base) {
		rio_dprintk(RIO_DEBUG_CMD, "Command cmdblk %p here\n", *Base);
		Base = &((*Base)->NextP);
		rio_dprintk(RIO_DEBUG_CMD, "Now try to queue cmd cmdblk %p at %p\n", CmdBlkP, Base);
	}

	rio_dprintk(RIO_DEBUG_CMD, "Will queue cmdblk %p at %p\n", CmdBlkP, Base);

	*Base = CmdBlkP;

	CmdBlkP->NextP = NULL;

	rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

	return 0;
}

void RIOServiceHost(struct rio_info *p, struct Host *HostP, int From)
{
	rio_spin_lock(&HostP->HostLock);
	if ((HostP->Flags & RUN_STATE) != RC_RUNNING) {
		static int t = 0;
		rio_spin_unlock(&HostP->HostLock);
		if ((t++ % 200) == 0)
			rio_dprintk(RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int) HostP->Flags);
		return;
	}
	rio_spin_unlock(&HostP->HostLock);

	if (readw(&HostP->ParmMapP->rup_intr)) {
		writew(0, &HostP->ParmMapP->rup_intr);
		p->RIORupCount++;
		RupIntr++;
		rio_dprintk(RIO_DEBUG_INTR, "rio: RUP interrupt on host %Zd\n", HostP - p->RIOHosts);
		RIOPollHostCommands(p, HostP);
	}

	if (readw(&HostP->ParmMapP->rx_intr)) {
		int port;

		writew(0, &HostP->ParmMapP->rx_intr);
		p->RIORxCount++;
		RxIntr++;

		rio_dprintk(RIO_DEBUG_INTR, "rio: RX interrupt on host %Zd\n", HostP - p->RIOHosts);
		/*
		 ** Loop through every port. If the port is mapped into
		 ** the system ( i.e. has /dev/ttyXXXX associated ) then it is
		 ** worth checking. If the port isn't open, grab any packets
		 ** hanging on its receive queue and stuff them on the free
		 ** list; check for commands on the way.
		 */
		for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) {
			struct Port *PortP = p->RIOPortp[port];
			struct tty_struct *ttyP;
			struct PKT __iomem *PacketP;

			/*
			 ** not mapped in - most of the RIOPortp[] information
			 ** has not been set up!
			 ** Optimise: ports come in bundles of eight.
			 */
			if (!PortP->Mapped) {
				port += 7;
				continue;	/* with the next port */
			}

			/*
			 ** If the host board isn't THIS host board, check the next one.
			 ** optimise: ports come in bundles of eight.
			 */
			if (PortP->HostP != HostP) {
				port += 7;
				continue;
			}

			/*
			 ** Let us see - is the port open? If not, then don't service it.
			 */
			if (!(PortP->PortState & PORT_ISOPEN)) {
				continue;
			}

			/*
			 ** find corresponding tty structure. The process of mapping
			 ** the ports puts these here.
			 */
			ttyP = PortP->gs.tty;

			/*
			 ** Lock the port before we begin working on it.
			 */
			rio_spin_lock(&PortP->portSem);

			/*
			 ** Process received data if there is any.
			 */
			if (can_remove_receive(&PacketP, PortP))
				RIOReceive(p, PortP);

			/*
			 ** If there is no data left to be read from the port, and
			 ** it's handshake bit is set, then we must clear the handshake,
			 ** so that that downstream RTA is re-enabled.
			 */
			if (!can_remove_receive(&PacketP, PortP) && (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET)) {
				/*
				 ** MAGIC! ( Basically, handshake the RX buffer, so that
				 ** the RTAs upstream can be re-enabled. )
				 */
				rio_dprintk(RIO_DEBUG_INTR, "Set RX handshake bit\n");
				writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
			}
			rio_spin_unlock(&PortP->portSem);
		}
	}

//.........这里部分代码省略.........

int RIOKillNeighbour(struct rio_info *p, void __user * arg)
{
	uint Host;
	uint ID;
	struct Host *HostP;
	struct CmdBlk *CmdBlkP;

	rio_dprintk(RIO_DEBUG_CMD, "KILL HOST NEIGHBOUR\n");

	if (copy_from_user(&KillUnit, arg, sizeof(KillUnit))) {
		rio_dprintk(RIO_DEBUG_CMD, "RIO_KILL_NEIGHBOUR copy failed\n");
		p->RIOError.Error = COPYIN_FAILED;
		return -EFAULT;
	}

	if (KillUnit.Link > 3)
		return -ENXIO;

	CmdBlkP = RIOGetCmdBlk();

	if (!CmdBlkP) {
		rio_dprintk(RIO_DEBUG_CMD, "UFOAD: GetCmdBlk failed\n");
		return -ENXIO;
	}

	CmdBlkP->Packet.dest_unit = 0;
	CmdBlkP->Packet.src_unit = 0;
	CmdBlkP->Packet.dest_port = BOOT_RUP;
	CmdBlkP->Packet.src_port = BOOT_RUP;
	CmdBlkP->Packet.len = 0x84;
	CmdBlkP->Packet.data[0] = UFOAD;
	CmdBlkP->Packet.data[1] = KillUnit.Link;
	CmdBlkP->Packet.data[2] = UFOAD_MAGIC & 0xFF;
	CmdBlkP->Packet.data[3] = (UFOAD_MAGIC >> 8) & 0xFF;

	for (Host = 0; Host < p->RIONumHosts; Host++) {
		ID = 0;
		HostP = &p->RIOHosts[Host];

		if (HostP->UniqueNum == KillUnit.UniqueNum) {
			if (RIOQueueCmdBlk(HostP, RTAS_PER_HOST + KillUnit.Link, CmdBlkP) == RIO_FAIL) {
				rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
				return -EIO;
			}
			return 0;
		}

		for (ID = 0; ID < RTAS_PER_HOST; ID++) {
			if (HostP->Mapping[ID].RtaUniqueNum == KillUnit.UniqueNum) {
				CmdBlkP->Packet.dest_unit = ID + 1;
				if (RIOQueueCmdBlk(HostP, ID, CmdBlkP) == RIO_FAIL) {
					rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
					return -EIO;
				}
				return 0;
			}
		}
	}
	RIOFreeCmdBlk(CmdBlkP);
	return -ENXIO;
}

/*
** Here we go - if there is an empty rup, fill it!
** must be called at splrio() or higher.
*/
void RIOPollHostCommands(struct rio_info *p, struct Host *HostP)
{
	struct CmdBlk *CmdBlkP;
	struct UnixRup *UnixRupP;
	struct PKT __iomem *PacketP;
	unsigned short Rup;
	unsigned long flags;


	Rup = MAX_RUP + LINKS_PER_UNIT;

	do {			/* do this loop for each RUP */
		/*
		 ** locate the rup we are processing & lock it
		 */
		UnixRupP = &HostP->UnixRups[--Rup];

		spin_lock_irqsave(&UnixRupP->RupLock, flags);

		/*
		 ** First check for incoming commands:
		 */
		if (readw(&UnixRupP->RupP->rxcontrol) != RX_RUP_INACTIVE) {
			int FreeMe;

			PacketP = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->rxpkt));

			switch (readb(&PacketP->dest_port)) {
			case BOOT_RUP:
				rio_dprintk(RIO_DEBUG_CMD, "Incoming Boot %s packet '%x'\n", readb(&PacketP->len) & 0x80 ? "Command" : "Data", readb(&PacketP->data[0]));
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIOBootRup(p, Rup, HostP, PacketP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			case COMMAND_RUP:
				/*
				 ** Free the RUP lock as loss of carrier causes a
				 ** ttyflush which will (eventually) call another
				 ** routine that uses the RUP lock.
				 */
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIOCommandRup(p, Rup, HostP, PacketP);
				if (readb(&PacketP->data[5]) == MEMDUMP) {
					rio_dprintk(RIO_DEBUG_CMD, "Memdump from 0x%x complete\n", readw(&(PacketP->data[6])));
					rio_memcpy_fromio(p->RIOMemDump, &(PacketP->data[8]), 32);
				}
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			case ROUTE_RUP:
				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
				FreeMe = RIORouteRup(p, Rup, HostP, PacketP);
				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
				break;

			default:
				rio_dprintk(RIO_DEBUG_CMD, "Unknown RUP %d\n", readb(&PacketP->dest_port));
				FreeMe = 1;
				break;
			}

			if (FreeMe) {
				rio_dprintk(RIO_DEBUG_CMD, "Free processed incoming command packet\n");
				put_free_end(HostP, PacketP);

				writew(RX_RUP_INACTIVE, &UnixRupP->RupP->rxcontrol);

				if (readw(&UnixRupP->RupP->handshake) == PHB_HANDSHAKE_SET) {
					rio_dprintk(RIO_DEBUG_CMD, "Handshake rup %d\n", Rup);
					writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &UnixRupP->RupP->handshake);
				}
			}
		}

		/*
		 ** IF a command was running on the port,
		 ** and it has completed, then tidy it up.
		 */
		if ((CmdBlkP = UnixRupP->CmdPendingP) &&	/* ASSIGN! */
		    (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
			/*
			 ** we are idle.
			 ** there is a command in pending.
			 ** Therefore, this command has finished.
			 ** So, wakeup whoever is waiting for it (and tell them
			 ** what happened).
			 */
			if (CmdBlkP->Packet.dest_port == BOOT_RUP)
				rio_dprintk(RIO_DEBUG_CMD, "Free Boot %s Command Block '%x'\n", CmdBlkP->Packet.len & 0x80 ? "Command" : "Data", CmdBlkP->Packet.data[0]);

			rio_dprintk(RIO_DEBUG_CMD, "Command %p completed\n", CmdBlkP);

			/*
			 ** Clear the Rup lock to prevent mutual exclusion.
			 */
//.........这里部分代码省略.........

int riotopen(struct tty_struct *tty, struct file *filp)
{
	unsigned int SysPort;
	int repeat_this = 250;
	struct Port *PortP;	/* pointer to the port structure */
	unsigned long flags;
	int retval = 0;

	func_enter();

	/* Make sure driver_data is NULL in case the rio isn't booted jet. Else gs_close
	   is going to oops.
	 */
	tty->driver_data = NULL;

	SysPort = rio_minor(tty);

	if (p->RIOFailed) {
		rio_dprintk(RIO_DEBUG_TTY, "System initialisation failed\n");
		func_exit();
		return -ENXIO;
	}

	rio_dprintk(RIO_DEBUG_TTY, "port open SysPort %d (mapped:%d)\n", SysPort, p->RIOPortp[SysPort]->Mapped);

	/*
	 ** Validate that we have received a legitimate request.
	 ** Currently, just check that we are opening a port on
	 ** a host card that actually exists, and that the port
	 ** has been mapped onto a host.
	 */
	if (SysPort >= RIO_PORTS) {	/* out of range ? */
		rio_dprintk(RIO_DEBUG_TTY, "Illegal port number %d\n", SysPort);
		func_exit();
		return -ENXIO;
	}

	/*
	 ** Grab pointer to the port stucture
	 */
	PortP = p->RIOPortp[SysPort];	/* Get control struc */
	rio_dprintk(RIO_DEBUG_TTY, "PortP: %p\n", PortP);
	if (!PortP->Mapped) {	/* we aren't mapped yet! */
		/*
		 ** The system doesn't know which RTA this port
		 ** corresponds to.
		 */
		rio_dprintk(RIO_DEBUG_TTY, "port not mapped into system\n");
		func_exit();
		return -ENXIO;
	}

	tty->driver_data = PortP;

	PortP->gs.tty = tty;
	PortP->gs.count++;

	rio_dprintk(RIO_DEBUG_TTY, "%d bytes in tx buffer\n", PortP->gs.xmit_cnt);

	retval = gs_init_port(&PortP->gs);
	if (retval) {
		PortP->gs.count--;
		return -ENXIO;
	}
	/*
	 ** If the host hasn't been booted yet, then
	 ** fail
	 */
	if ((PortP->HostP->Flags & RUN_STATE) != RC_RUNNING) {
		rio_dprintk(RIO_DEBUG_TTY, "Host not running\n");
		func_exit();
		return -ENXIO;
	}

	/*
	 ** If the RTA has not booted yet and the user has choosen to block
	 ** until the RTA is present then we must spin here waiting for
	 ** the RTA to boot.
	 */
	/* I find the above code a bit hairy. I find the below code
	   easier to read and shorter. Now, if it works too that would
	   be great... -- REW 
	 */
	rio_dprintk(RIO_DEBUG_TTY, "Checking if RTA has booted... \n");
	while (!(PortP->HostP->Mapping[PortP->RupNum].Flags & RTA_BOOTED)) {
		if (!PortP->WaitUntilBooted) {
			rio_dprintk(RIO_DEBUG_TTY, "RTA never booted\n");
			func_exit();
			return -ENXIO;
		}

		/* Under Linux you'd normally use a wait instead of this
		   busy-waiting. I'll stick with the old implementation for
		   now. --REW
		 */
		if (RIODelay(PortP, HUNDRED_MS) == RIO_FAIL) {
			rio_dprintk(RIO_DEBUG_TTY, "RTA_wait_for_boot: EINTR in delay \n");
			func_exit();
			return -EINTR;
		}
//.........这里部分代码省略.........

/*
** A configuration table has been loaded. It is now up to us
** to sort it out and use the information contained therein.
*/
int RIONewTable(struct rio_info *p)
{
	int Host, Host1, Host2, NameIsUnique, Entry, SubEnt;
	struct Map *MapP;
	struct Map *HostMapP;
	struct Host *HostP;

	char *cptr;

	/*
	 ** We have been sent a new table to install. We need to break
	 ** it down into little bits and spread it around a bit to see
	 ** what we have got.
	 */
	/*
	 ** Things to check:
	 ** (things marked 'xx' aren't checked any more!)
	 ** (1) That there are no booted Hosts/RTAs out there.
	 ** (2) That the names are properly formed
	 ** (3) That blank entries really are.
	 ** xx (4)      That hosts mentioned in the table actually exist. xx
	 ** (5) That the IDs are unique (per host).
	 ** (6) That host IDs are zero
	 ** (7) That port numbers are valid
	 ** (8) That port numbers aren't duplicated
	 ** (9) That names aren't duplicated
	 ** xx (10) That hosts that actually exist are mentioned in the table. xx
	 */
	rio_dprintk(RIO_DEBUG_TABLE, "RIONewTable: entering(1)\n");
	if (p->RIOSystemUp) {	/* (1) */
		p->RIOError.Error = HOST_HAS_ALREADY_BEEN_BOOTED;
		return -EBUSY;
	}

	p->RIOError.Error = NOTHING_WRONG_AT_ALL;
	p->RIOError.Entry = -1;
	p->RIOError.Other = -1;

	for (Entry = 0; Entry < TOTAL_MAP_ENTRIES; Entry++) {
		MapP = &p->RIOConnectTable[Entry];
		if ((MapP->Flags & RTA16_SECOND_SLOT) == 0) {
			rio_dprintk(RIO_DEBUG_TABLE, "RIONewTable: entering(2)\n");
			cptr = MapP->Name;	/* (2) */
			cptr[MAX_NAME_LEN - 1] = '\0';
			if (cptr[0] == '\0') {
				memcpy(MapP->Name, MapP->RtaUniqueNum ? "RTA	NN" : "HOST NN", 8);
				MapP->Name[5] = '0' + Entry / 10;
				MapP->Name[6] = '0' + Entry % 10;
			}
			while (*cptr) {
				if (*cptr < ' ' || *cptr > '~') {
					p->RIOError.Error = BAD_CHARACTER_IN_NAME;
					p->RIOError.Entry = Entry;
					return -ENXIO;
				}
				cptr++;
			}
		}

		/*
		 ** If the entry saved was a tentative entry then just forget
		 ** about it.
		 */
		if (MapP->Flags & SLOT_TENTATIVE) {
			MapP->HostUniqueNum = 0;
			MapP->RtaUniqueNum = 0;
			continue;
		}

		rio_dprintk(RIO_DEBUG_TABLE, "RIONewTable: entering(3)\n");
		if (!MapP->RtaUniqueNum && !MapP->HostUniqueNum) {	/* (3) */
			if (MapP->ID || MapP->SysPort || MapP->Flags) {
				rio_dprintk(RIO_DEBUG_TABLE, "%s pretending to be empty but isn't\n", MapP->Name);
				p->RIOError.Error = TABLE_ENTRY_ISNT_PROPERLY_NULL;
				p->RIOError.Entry = Entry;
				return -ENXIO;
			}
			rio_dprintk(RIO_DEBUG_TABLE, "!RIO: Daemon: test (3) passes\n");
			continue;
		}

		rio_dprintk(RIO_DEBUG_TABLE, "RIONewTable: entering(4)\n");
		for (Host = 0; Host < p->RIONumHosts; Host++) {	/* (4) */
			if (p->RIOHosts[Host].UniqueNum == MapP->HostUniqueNum) {
				HostP = &p->RIOHosts[Host];
				/*
				 ** having done the lookup, we don't really want to do
				 ** it again, so hang the host number in a safe place
				 */
				MapP->Topology[0].Unit = Host;
				break;
			}
		}

		if (Host >= p->RIONumHosts) {
			rio_dprintk(RIO_DEBUG_TABLE, "RTA %s has unknown host unique number 0x%x\n", MapP->Name, MapP->HostUniqueNum);
//.........这里部分代码省略.........

/*
** Routine for handling received data for tty drivers
*/
static void RIOReceive(struct rio_info *p, struct Port *PortP)
{
	struct tty_struct *TtyP;
	unsigned short transCount;
	struct PKT __iomem *PacketP;
	register unsigned int DataCnt;
	unsigned char __iomem *ptr;
	unsigned char *buf;
	int copied = 0;

	static int intCount, RxIntCnt;

	/*
	 ** The receive data process is to remove packets from the
	 ** PHB until there aren't any more or the current cblock
	 ** is full. When this occurs, there will be some left over
	 ** data in the packet, that we must do something with.
	 ** As we haven't unhooked the packet from the read list
	 ** yet, we can just leave the packet there, having first
	 ** made a note of how far we got. This means that we need
	 ** a pointer per port saying where we start taking the
	 ** data from - this will normally be zero, but when we
	 ** run out of space it will be set to the offset of the
	 ** next byte to copy from the packet data area. The packet
	 ** length field is decremented by the number of bytes that
	 ** we successfully removed from the packet. When this reaches
	 ** zero, we reset the offset pointer to be zero, and free
	 ** the packet from the front of the queue.
	 */

	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) {
			RxIntCnt++;

			/*
			 ** check that it is not a command!
			 */
			if (readb(&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", readb(&PacketP->dest_unit));
				rio_dprintk(RIO_DEBUG_INTR, " dest_port = %d\n", readb(&PacketP->dest_port));
				rio_dprintk(RIO_DEBUG_INTR, " src_unit  = %d\n", readb(&PacketP->src_unit));
				rio_dprintk(RIO_DEBUG_INTR, " src_port  = %d\n", readb(&PacketP->src_port));
				rio_dprintk(RIO_DEBUG_INTR, " len	   = %d\n", readb(&PacketP->len));
				rio_dprintk(RIO_DEBUG_INTR, " control   = %d\n", readb(&PacketP->control));
				rio_dprintk(RIO_DEBUG_INTR, " csum	   = %d\n", readw(&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", readb(&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.
			 */

//.........这里部分代码省略.........