1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright (c) 2006 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
*/
/**
* @file
* Implement a port which adds simple support of a sendTiming() function that
* takes a 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.
*/
/** recvTiming and drain should be implemented something like this when this
* class is used.
bool
PioPort::recvTiming(Packet *pkt)
{
if (pkt->result == Packet::Nacked) {
resendNacked(pkt);
} else {
Tick latency = device->recvAtomic(pkt);
// turn packet around to go back to requester
pkt->makeTimingResponse();
sendTiming(pkt, latency);
}
return true;
}
PioDevice::drain(Event *de)
{
unsigned int count;
count = SimpleTimingPort->drain(de);
if (count)
changeState(Draining);
else
changeState(Drained);
return count;
}
*/
#ifndef __MEM_TPORT_HH__
#define __MEM_TPORT_HH__
#include "mem/port.hh"
#include "sim/eventq.hh"
#include <list>
#include <string>
class SimpleTimingPort : public Port
{
protected:
/** A list of outgoing timing response packets that haven't been serviced
* yet. */
std::list<Packet*> transmitList;
/**
* 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
{
SimpleTimingPort *port;
Packet *packet;
SendEvent(SimpleTimingPort *p, Packet *pkt, Tick t)
: Event(&mainEventQueue), port(p), packet(pkt)
{ setFlags(AutoDelete); schedule(curTick + t); }
virtual void process();
virtual const char *description()
{ return "Future scheduled sendTiming event"; }
friend class SimpleTimingPort;
};
/** Number of timing requests that are emulating the device timing before
* attempting to end up on the bus.
*/
int outTiming;
/** If we need to drain, keep the drain event around until we're done
* here.*/
Event *drainEvent;
/** Schedule a sendTiming() event to be called in the future. */
void sendTiming(Packet *pkt, Tick time)
{ outTiming++; new SimpleTimingPort::SendEvent(this, pkt, time); }
/** This function is notification that the device should attempt to send a
* packet again. */
virtual void recvRetry();
void resendNacked(Packet *pkt);
public:
SimpleTimingPort(std::string pname)
: Port(pname), outTiming(0), drainEvent(NULL)
{}
unsigned int drain(Event *de);
friend class SimpleTimingPort::SendEvent;
};
#endif // __MEM_TPORT_HH__
|
