packet.cc revision 6076:e141cc7896ce 
1/*
2 * Copyright (c) 2006 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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Ali Saidi
29 *          Steve Reinhardt
30 */
31
32/**
33 * @file
34 * Definition of the Packet Class, a packet is a transaction occuring
35 * between a single level of the memory heirarchy (ie L1->L2).
36 */
37
38#include <iostream>
39#include <cstring>
40#include "base/cprintf.hh"
41#include "base/misc.hh"
42#include "base/trace.hh"
43#include "mem/packet.hh"
44
45using namespace std;
46
47// The one downside to bitsets is that static initializers can get ugly.
48#define SET1(a1)                     (1 << (a1))
49#define SET2(a1, a2)                 (SET1(a1) | SET1(a2))
50#define SET3(a1, a2, a3)             (SET2(a1, a2) | SET1(a3))
51#define SET4(a1, a2, a3, a4)         (SET3(a1, a2, a3) | SET1(a4))
52#define SET5(a1, a2, a3, a4, a5)     (SET4(a1, a2, a3, a4) | SET1(a5))
53#define SET6(a1, a2, a3, a4, a5, a6) (SET5(a1, a2, a3, a4, a5) | SET1(a6))
54
55const MemCmd::CommandInfo
56MemCmd::commandInfo[] =
57{
58    /* InvalidCmd */
59    { 0, InvalidCmd, "InvalidCmd" },
60    /* ReadReq */
61    { SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadReq" },
62    /* ReadResp */
63    { SET3(IsRead, IsResponse, HasData), InvalidCmd, "ReadResp" },
64    /* ReadRespWithInvalidate */
65    { SET4(IsRead, IsResponse, HasData, IsInvalidate),
66            InvalidCmd, "ReadRespWithInvalidate" },
67    /* WriteReq */
68    { SET5(IsWrite, NeedsExclusive, IsRequest, NeedsResponse, HasData),
69            WriteResp, "WriteReq" },
70    /* WriteResp */
71    { SET3(IsWrite, NeedsExclusive, IsResponse), InvalidCmd, "WriteResp" },
72    /* Writeback */
73    { SET4(IsWrite, NeedsExclusive, IsRequest, HasData),
74            InvalidCmd, "Writeback" },
75    /* SoftPFReq */
76    { SET4(IsRead, IsRequest, IsSWPrefetch, NeedsResponse),
77            SoftPFResp, "SoftPFReq" },
78    /* HardPFReq */
79    { SET4(IsRead, IsRequest, IsHWPrefetch, NeedsResponse),
80            HardPFResp, "HardPFReq" },
81    /* SoftPFResp */
82    { SET4(IsRead, IsResponse, IsSWPrefetch, HasData),
83            InvalidCmd, "SoftPFResp" },
84    /* HardPFResp */
85    { SET4(IsRead, IsResponse, IsHWPrefetch, HasData),
86            InvalidCmd, "HardPFResp" },
87    /* WriteInvalidateReq */
88    { SET6(IsWrite, NeedsExclusive, IsInvalidate,
89           IsRequest, HasData, NeedsResponse),
90            WriteInvalidateResp, "WriteInvalidateReq" },
91    /* WriteInvalidateResp */
92    { SET3(IsWrite, NeedsExclusive, IsResponse),
93            InvalidCmd, "WriteInvalidateResp" },
94    /* UpgradeReq */
95    { SET4(IsInvalidate, NeedsExclusive, IsRequest, NeedsResponse),
96            UpgradeResp, "UpgradeReq" },
97    /* UpgradeResp */
98    { SET2(NeedsExclusive, IsResponse),
99            InvalidCmd, "UpgradeResp" },
100    /* ReadExReq */
101    { SET5(IsRead, NeedsExclusive, IsInvalidate, IsRequest, NeedsResponse),
102            ReadExResp, "ReadExReq" },
103    /* ReadExResp */
104    { SET4(IsRead, NeedsExclusive, IsResponse, HasData),
105            InvalidCmd, "ReadExResp" },
106    /* LoadLockedReq: note that we use plain ReadResp as response, so that
107     *                we can also use ReadRespWithInvalidate when needed */
108    { SET4(IsRead, IsLlsc, IsRequest, NeedsResponse),
109            ReadResp, "LoadLockedReq" },
110    /* StoreCondReq */
111    { SET6(IsWrite, NeedsExclusive, IsLlsc,
112           IsRequest, NeedsResponse, HasData),
113            StoreCondResp, "StoreCondReq" },
114    /* StoreCondResp */
115    { SET4(IsWrite, NeedsExclusive, IsLlsc, IsResponse),
116            InvalidCmd, "StoreCondResp" },
117    /* SwapReq -- for Swap ldstub type operations */
118    { SET6(IsRead, IsWrite, NeedsExclusive, IsRequest, HasData, NeedsResponse),
119        SwapResp, "SwapReq" },
120    /* SwapResp -- for Swap ldstub type operations */
121    { SET5(IsRead, IsWrite, NeedsExclusive, IsResponse, HasData),
122            InvalidCmd, "SwapResp" },
123    /* IntReq -- for interrupts */
124    { SET4(IsWrite, IsRequest, NeedsResponse, HasData),
125        MessageResp, "MessageReq" },
126    /* IntResp -- for interrupts */
127    { SET2(IsWrite, IsResponse), InvalidCmd, "MessageResp" },
128    /* NetworkNackError  -- nacked at network layer (not by protocol) */
129    { SET2(IsResponse, IsError), InvalidCmd, "NetworkNackError" },
130    /* InvalidDestError  -- packet dest field invalid */
131    { SET2(IsResponse, IsError), InvalidCmd, "InvalidDestError" },
132    /* BadAddressError   -- memory address invalid */
133    { SET2(IsResponse, IsError), InvalidCmd, "BadAddressError" },
134    /* PrintReq */
135    { SET2(IsRequest, IsPrint), InvalidCmd, "PrintReq" }
136};
137
138bool
139Packet::checkFunctional(Printable *obj, Addr addr, int size, uint8_t *data)
140{
141    Addr func_start = getAddr();
142    Addr func_end   = getAddr() + getSize() - 1;
143    Addr val_start  = addr;
144    Addr val_end    = val_start + size - 1;
145
146    if (func_start > val_end || val_start > func_end) {
147        // no intersection
148        return false;
149    }
150
151    // check print first since it doesn't require data
152    if (isPrint()) {
153        dynamic_cast<PrintReqState*>(senderState)->printObj(obj);
154        return false;
155    }
156
157    // if there's no data, there's no need to look further
158    if (!data) {
159        return false;
160    }
161
162    // offset of functional request into supplied value (could be
163    // negative if partial overlap)
164    int offset = func_start - val_start;
165
166    if (isRead()) {
167        if (func_start >= val_start && func_end <= val_end) {
168            allocate();
169            memcpy(getPtr<uint8_t>(), data + offset, getSize());
170            makeResponse();
171            return true;
172        } else {
173            // In this case the timing packet only partially satisfies
174            // the request, so we would need more information to make
175            // this work.  Like bytes valid in the packet or
176            // something, so the request could continue and get this
177            // bit of possibly newer data along with the older data
178            // not written to yet.
179            panic("Memory value only partially satisfies the functional "
180                  "request. Now what?");
181        }
182    } else if (isWrite()) {
183        if (offset >= 0) {
184            memcpy(data + offset, getPtr<uint8_t>(),
185                   (min(func_end, val_end) - func_start) + 1);
186        } else {
187            // val_start > func_start
188            memcpy(data, getPtr<uint8_t>() - offset,
189                   (min(func_end, val_end) - val_start) + 1);
190        }
191    } else {
192        panic("Don't know how to handle command %s\n", cmdString());
193    }
194
195    // keep going with request by default
196    return false;
197}
198
199void
200Packet::print(ostream &o, const int verbosity, const string &prefix) const
201{
202    ccprintf(o, "%s[%x:%x] %s\n", prefix,
203             getAddr(), getAddr() + getSize() - 1, cmdString());
204}
205
206Packet::PrintReqState::PrintReqState(ostream &_os, int _verbosity)
207    : curPrefixPtr(new string("")), os(_os), verbosity(_verbosity)
208{
209    labelStack.push_back(LabelStackEntry("", curPrefixPtr));
210}
211
212Packet::PrintReqState::~PrintReqState()
213{
214    labelStack.pop_back();
215    assert(labelStack.empty());
216    delete curPrefixPtr;
217}
218
219Packet::PrintReqState::
220LabelStackEntry::LabelStackEntry(const string &_label, string *_prefix)
221    : label(_label), prefix(_prefix), labelPrinted(false)
222{
223}
224
225void
226Packet::PrintReqState::pushLabel(const string &lbl, const string &prefix)
227{
228    labelStack.push_back(LabelStackEntry(lbl, curPrefixPtr));
229    curPrefixPtr = new string(*curPrefixPtr);
230    *curPrefixPtr += prefix;
231}
232
233void
234Packet::PrintReqState::popLabel()
235{
236    delete curPrefixPtr;
237    curPrefixPtr = labelStack.back().prefix;
238    labelStack.pop_back();
239    assert(!labelStack.empty());
240}
241
242void
243Packet::PrintReqState::printLabels()
244{
245    if (!labelStack.back().labelPrinted) {
246        LabelStack::iterator i = labelStack.begin();
247        LabelStack::iterator end = labelStack.end();
248        while (i != end) {
249            if (!i->labelPrinted) {
250                ccprintf(os, "%s%s\n", *(i->prefix), i->label);
251                i->labelPrinted = true;
252            }
253            i++;
254        }
255    }
256}
257
258
259void
260Packet::PrintReqState::printObj(Printable *obj)
261{
262    printLabels();
263    obj->print(os, verbosity, curPrefix());
264}
265