diff options
Diffstat (limited to 'src/dev/io_device.hh')
| -rw-r--r-- | src/dev/io_device.hh | 86 |
1 files changed, 30 insertions, 56 deletions
diff --git a/src/dev/io_device.hh b/src/dev/io_device.hh index 40edf6875..710b22b2c 100644 --- a/src/dev/io_device.hh +++ b/src/dev/io_device.hh @@ -37,6 +37,7 @@ #include "mem/packet_impl.hh" #include "sim/eventq.hh" #include "sim/sim_object.hh" +#include "mem/tport.hh" class Platform; class PioDevice; @@ -48,25 +49,17 @@ class System; * sensitive to an address range use. The port takes all the memory * access types and roles them into one read() and write() call that the device * must respond to. The device must also provide the addressRanges() function - * with which it returns the address ranges it is interested in. An extra - * sendTiming() function is implemented which takes an delay. In this way the - * device can immediatly call sendTiming(pkt, time) after processing a request - * and the request will be handled by the port even if the port bus the device - * connects to is blocked. - */ -class PioPort : public Port + * with which it returns the address ranges it is interested in. */ + +class PioPort : public SimpleTimingPort { protected: /** The device that this port serves. */ PioDevice *device; - /** The platform that device/port are in. This is used to select which mode + /** The system that device/port are in. This is used to select which mode * we are currently operating in. */ - Platform *platform; - - /** A list of outgoing timing response packets that haven't been serviced - * yet. */ - std::list<Packet*> transmitList; + System *sys; /** The current status of the peer(bus) that we are connected to. */ Status peerStatus; @@ -82,42 +75,9 @@ class PioPort : public Port virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop); - void resendNacked(Packet *pkt); - - /** - * This class is used to implemented sendTiming() with a delay. When a delay - * is requested a new event is created. When the event time expires it - * attempts to send the packet. If it cannot, the packet is pushed onto the - * transmit list to be sent when recvRetry() is called. */ - class SendEvent : public Event - { - PioPort *port; - Packet *packet; - - SendEvent(PioPort *p, Packet *pkt, Tick t) - : Event(&mainEventQueue), port(p), packet(pkt) - { schedule(curTick + t); } - - virtual void process(); - - virtual const char *description() - { return "Future scheduled sendTiming event"; } - - friend class PioPort; - }; - - /** Schedule a sendTiming() event to be called in the future. */ - void sendTiming(Packet *pkt, Tick time) - { new PioPort::SendEvent(this, pkt, time); } - - /** This function is notification that the device should attempt to send a - * packet again. */ - virtual void recvRetry(); - public: - PioPort(PioDevice *dev, Platform *p, std::string pname = "-pioport"); + PioPort(PioDevice *dev, System *s, std::string pname = "-pioport"); - friend class PioPort::SendEvent; }; @@ -147,13 +107,20 @@ class DmaPort : public Port DmaDevice *device; std::list<Packet*> transmitList; - /** The platform that device/port are in. This is used to select which mode + /** The system that device/port are in. This is used to select which mode * we are currently operating in. */ - Platform *platform; + System *sys; /** Number of outstanding packets the dma port has. */ int pendingCount; + /** If a dmaAction is in progress. */ + int actionInProgress; + + /** If we need to drain, keep the drain event around until we're done + * here.*/ + Event *drainEvent; + virtual bool recvTiming(Packet *pkt); virtual Tick recvAtomic(Packet *pkt) { panic("dma port shouldn't be used for pio access."); } @@ -171,13 +138,14 @@ class DmaPort : public Port void sendDma(Packet *pkt, bool front = false); public: - DmaPort(DmaDevice *dev, Platform *p); + DmaPort(DmaDevice *dev, System *s); void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, uint8_t *data = NULL); bool dmaPending() { return pendingCount > 0; } + unsigned int drain(Event *de); }; /** @@ -196,6 +164,8 @@ class PioDevice : public MemObject * transaction we should perform. */ Platform *platform; + System *sys; + /** The pioPort that handles the requests for us and provides us requests * that it sees. */ PioPort *pioPort; @@ -240,20 +210,22 @@ class PioDevice : public MemObject const Params *params() const { return _params; } PioDevice(Params *p) - : MemObject(p->name), platform(p->platform), pioPort(NULL), - _params(p) + : MemObject(p->name), platform(p->platform), sys(p->system), + pioPort(NULL), _params(p) {} virtual ~PioDevice(); virtual void init(); + virtual unsigned int drain(Event *de); + virtual Port *getPort(const std::string &if_name, int idx = -1) { if (if_name == "pio") { if (pioPort != NULL) panic("pio port already connected to."); - pioPort = new PioPort(this, params()->platform); + pioPort = new PioPort(this, sys); return pioPort; } else return NULL; @@ -287,7 +259,7 @@ class BasicPioDevice : public PioDevice {} /** return the address ranges that this device responds to. - * @params range_list range list to populate with ranges + * @param range_list range list to populate with ranges */ void addressRanges(AddrRangeList &range_list); @@ -310,17 +282,19 @@ class DmaDevice : public PioDevice bool dmaPending() { return dmaPort->dmaPending(); } + virtual unsigned int drain(Event *de); + virtual Port *getPort(const std::string &if_name, int idx = -1) { if (if_name == "pio") { if (pioPort != NULL) panic("pio port already connected to."); - pioPort = new PioPort(this, params()->platform); + pioPort = new PioPort(this, sys); return pioPort; } else if (if_name == "dma") { if (dmaPort != NULL) panic("dma port already connected to."); - dmaPort = new DmaPort(this, params()->platform); + dmaPort = new DmaPort(this, sys); return dmaPort; } else return NULL; |