io_device.hh (2982:0ecdb0879b14) io_device.hh (3090:3cced9156352)
1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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27 *
28 * Authors: Ali Saidi
29 * Nathan Binkert
30 */
31
32#ifndef __DEV_IO_DEVICE_HH__
33#define __DEV_IO_DEVICE_HH__
34
1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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27 *
28 * Authors: Ali Saidi
29 * Nathan Binkert
30 */
31
32#ifndef __DEV_IO_DEVICE_HH__
33#define __DEV_IO_DEVICE_HH__
34
35#include "base/chunk_generator.hh"
36#include "mem/mem_object.hh"
37#include "mem/packet_impl.hh"
35#include "mem/mem_object.hh"
36#include "mem/packet_impl.hh"
38#include "sim/eventq.hh"
39#include "sim/sim_object.hh"
40#include "mem/tport.hh"
41
37#include "sim/sim_object.hh"
38#include "mem/tport.hh"
39
40class Event;
42class Platform;
43class PioDevice;
44class DmaDevice;
45class System;
46
47/**
48 * The PioPort class is a programmed i/o port that all devices that are
49 * sensitive to an address range use. The port takes all the memory
50 * access types and roles them into one read() and write() call that the device
51 * must respond to. The device must also provide the addressRanges() function
41class Platform;
42class PioDevice;
43class DmaDevice;
44class System;
45
46/**
47 * The PioPort class is a programmed i/o port that all devices that are
48 * sensitive to an address range use. The port takes all the memory
49 * access types and roles them into one read() and write() call that the device
50 * must respond to. The device must also provide the addressRanges() function
52 * with which it returns the address ranges it is interested in. */
53
51 * with which it returns the address ranges it is interested in.
52 */
54class PioPort : public SimpleTimingPort
55{
56 protected:
57 /** The device that this port serves. */
58 PioDevice *device;
59
60 /** The system that device/port are in. This is used to select which mode
61 * we are currently operating in. */

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68
69 virtual Tick recvAtomic(Packet *pkt);
70
71 virtual void recvFunctional(Packet *pkt) ;
72
73 virtual void recvStatusChange(Status status)
74 { peerStatus = status; }
75
53class PioPort : public SimpleTimingPort
54{
55 protected:
56 /** The device that this port serves. */
57 PioDevice *device;
58
59 /** The system that device/port are in. This is used to select which mode
60 * we are currently operating in. */

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67
68 virtual Tick recvAtomic(Packet *pkt);
69
70 virtual void recvFunctional(Packet *pkt) ;
71
72 virtual void recvStatusChange(Status status)
73 { peerStatus = status; }
74
76 virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
75 virtual void getDeviceAddressRanges(AddrRangeList &resp,
76 AddrRangeList &snoop);
77
78 public:
79 PioPort(PioDevice *dev, System *s, std::string pname = "-pioport");
80
81};
82
83
84class DmaPort : public Port

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127 virtual void recvFunctional(Packet *pkt)
128 { panic("dma port shouldn't be used for pio access."); }
129
130 virtual void recvStatusChange(Status status)
131 { ; }
132
133 virtual void recvRetry() ;
134
77
78 public:
79 PioPort(PioDevice *dev, System *s, std::string pname = "-pioport");
80
81};
82
83
84class DmaPort : public Port

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127 virtual void recvFunctional(Packet *pkt)
128 { panic("dma port shouldn't be used for pio access."); }
129
130 virtual void recvStatusChange(Status status)
131 { ; }
132
133 virtual void recvRetry() ;
134
135 virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
135 virtual void getDeviceAddressRanges(AddrRangeList &resp,
136 AddrRangeList &snoop)
136 { resp.clear(); snoop.clear(); }
137
138 void sendDma(Packet *pkt, bool front = false);
139
140 public:
141 DmaPort(DmaDevice *dev, System *s);
142
143 void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,

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150
151/**
152 * This device is the base class which all devices senstive to an address range
153 * inherit from. There are three pure virtual functions which all devices must
154 * implement addressRanges(), read(), and write(). The magic do choose which
155 * mode we are in, etc is handled by the PioPort so the device doesn't have to
156 * bother.
157 */
137 { resp.clear(); snoop.clear(); }
138
139 void sendDma(Packet *pkt, bool front = false);
140
141 public:
142 DmaPort(DmaDevice *dev, System *s);
143
144 void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,

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151
152/**
153 * This device is the base class which all devices senstive to an address range
154 * inherit from. There are three pure virtual functions which all devices must
155 * implement addressRanges(), read(), and write(). The magic do choose which
156 * mode we are in, etc is handled by the PioPort so the device doesn't have to
157 * bother.
158 */
158
159class PioDevice : public MemObject
160{
161 protected:
162
163 /** The platform we are in. This is used to decide what type of memory
164 * transaction we should perform. */
165 Platform *platform;
166
167 System *sys;
168
169 /** The pioPort that handles the requests for us and provides us requests
170 * that it sees. */
171 PioPort *pioPort;
172
173 virtual void addressRanges(AddrRangeList &range_list) = 0;
174
159class PioDevice : public MemObject
160{
161 protected:
162
163 /** The platform we are in. This is used to decide what type of memory
164 * transaction we should perform. */
165 Platform *platform;
166
167 System *sys;
168
169 /** The pioPort that handles the requests for us and provides us requests
170 * that it sees. */
171 PioPort *pioPort;
172
173 virtual void addressRanges(AddrRangeList &range_list) = 0;
174
175 /** As far as the devices are concerned they only accept atomic transactions
176 * which are converted to either a write or a read. */
175 /** As far as the devices are concerned they only accept atomic
176 * transactions which are converted to either a write or a
177 * read. */
177 Tick recvAtomic(Packet *pkt)
178 { return pkt->isRead() ? this->read(pkt) : this->write(pkt); }
179
178 Tick recvAtomic(Packet *pkt)
179 { return pkt->isRead() ? this->read(pkt) : this->write(pkt); }
180
180 /** Pure virtual function that the device must implement. Called when a read
181 * command is recieved by the port.
181 /** Pure virtual function that the device must implement. Called
182 * when a read command is recieved by the port.
182 * @param pkt Packet describing this request
183 * @return number of ticks it took to complete
184 */
185 virtual Tick read(Packet *pkt) = 0;
186
187 /** Pure virtual function that the device must implement. Called when a
188 * write command is recieved by the port.
189 * @param pkt Packet describing this request
190 * @return number of ticks it took to complete
191 */
192 virtual Tick write(Packet *pkt) = 0;
193
194 public:
183 * @param pkt Packet describing this request
184 * @return number of ticks it took to complete
185 */
186 virtual Tick read(Packet *pkt) = 0;
187
188 /** Pure virtual function that the device must implement. Called when a
189 * write command is recieved by the port.
190 * @param pkt Packet describing this request
191 * @return number of ticks it took to complete
192 */
193 virtual Tick write(Packet *pkt) = 0;
194
195 public:
195 /** Params struct which is extended through each device based on the
196 * parameters it needs. Since we are re-writing everything, we might as well
197 * start from the bottom this time. */
198
196 /** Params struct which is extended through each device based on
197 * the parameters it needs. Since we are re-writing everything, we
198 * might as well start from the bottom this time. */
199 struct Params
200 {
201 std::string name;
202 Platform *platform;
203 System *system;
204 };
205
206 protected:

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250 /** Size that the device's address range. */
251 Addr pioSize;
252
253 /** Delay that the device experinces on an access. */
254 Tick pioDelay;
255
256 public:
257 BasicPioDevice(Params *p)
199 struct Params
200 {
201 std::string name;
202 Platform *platform;
203 System *system;
204 };
205
206 protected:

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250 /** Size that the device's address range. */
251 Addr pioSize;
252
253 /** Delay that the device experinces on an access. */
254 Tick pioDelay;
255
256 public:
257 BasicPioDevice(Params *p)
258 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), pioDelay(p->pio_delay)
258 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0),
259 pioDelay(p->pio_delay)
259 {}
260
261 /** return the address ranges that this device responds to.
262 * @param range_list range list to populate with ranges
263 */
264 void addressRanges(AddrRangeList &range_list);
265
266};

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261
262 /** return the address ranges that this device responds to.
263 * @param range_list range list to populate with ranges
264 */
265 void addressRanges(AddrRangeList &range_list);
266
267};

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