memhelpers.hh revision 14297 
1/*
2 * Copyright (c) 2013 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2011 Google
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Gabe Black
41 */
42
43#ifndef __ARCH_GENERIC_MEMHELPERS_HH__
44#define __ARCH_GENERIC_MEMHELPERS_HH__
45
46#include "arch/isa_traits.hh"
47#include "base/types.hh"
48#include "mem/packet.hh"
49#include "mem/request.hh"
50#include "sim/byteswap.hh"
51#include "sim/insttracer.hh"
52
53/// Initiate a read from memory in timing mode.  Note that the 'mem'
54/// parameter is unused; only the type of that parameter is used
55/// to determine the size of the access.
56template <class XC, class MemT>
57Fault
58initiateMemRead(XC *xc, Trace::InstRecord *traceData, Addr addr,
59                MemT &mem, Request::Flags flags)
60{
61    return xc->initiateMemRead(addr, sizeof(MemT), flags);
62}
63
64/// Extract the data returned from a timing mode read.
65template <class MemT>
66void
67getMem(PacketPtr pkt, MemT &mem, Trace::InstRecord *traceData)
68{
69    mem = pkt->get<MemT>(TheISA::GuestByteOrder);
70    if (traceData)
71        traceData->setData(mem);
72}
73
74/// Read from memory in atomic mode.
75template <class XC, class MemT>
76Fault
77readMemAtomic(XC *xc, Trace::InstRecord *traceData, Addr addr, MemT &mem,
78              Request::Flags flags)
79{
80    memset(&mem, 0, sizeof(mem));
81    Fault fault = xc->readMem(addr, (uint8_t *)&mem, sizeof(MemT), flags);
82    if (fault == NoFault) {
83        mem = TheISA::gtoh(mem);
84        if (traceData)
85            traceData->setData(mem);
86    }
87    return fault;
88}
89
90/// Write to memory in timing mode.
91template <class XC, class MemT>
92Fault
93writeMemTiming(XC *xc, Trace::InstRecord *traceData, MemT mem, Addr addr,
94               Request::Flags flags, uint64_t *res)
95{
96    if (traceData) {
97        traceData->setData(mem);
98    }
99    mem = TheISA::htog(mem);
100    return xc->writeMem((uint8_t *)&mem, sizeof(MemT), addr, flags, res);
101}
102
103/// Write to memory in atomic mode.
104template <class XC, class MemT>
105Fault
106writeMemAtomic(XC *xc, Trace::InstRecord *traceData, const MemT &mem,
107               Addr addr, Request::Flags flags, uint64_t *res)
108{
109    if (traceData) {
110        traceData->setData(mem);
111    }
112    MemT host_mem = TheISA::htog(mem);
113    Fault fault =
114          xc->writeMem((uint8_t *)&host_mem, sizeof(MemT), addr, flags, res);
115    if (fault == NoFault && res != NULL) {
116        if (flags & Request::MEM_SWAP || flags & Request::MEM_SWAP_COND)
117            *(MemT *)res = TheISA::gtoh(*(MemT *)res);
118        else
119            *res = TheISA::gtoh(*res);
120    }
121    return fault;
122}
123
124/// Do atomic read-modify-write (AMO) in atomic mode
125template <class XC, class MemT>
126Fault
127amoMemAtomic(XC *xc, Trace::InstRecord *traceData, MemT &mem, Addr addr,
128             Request::Flags flags, AtomicOpFunctor *_amo_op)
129{
130    assert(_amo_op);
131
132    // mem will hold the previous value at addr after the AMO completes
133    memset(&mem, 0, sizeof(mem));
134
135    AtomicOpFunctorPtr amo_op = AtomicOpFunctorPtr(_amo_op);
136    Fault fault = xc->amoMem(addr, (uint8_t *)&mem, sizeof(MemT), flags,
137                             std::move(amo_op));
138
139    if (fault == NoFault) {
140        mem = TheISA::gtoh(mem);
141        if (traceData)
142            traceData->setData(mem);
143    }
144    return fault;
145}
146
147/// Do atomic read-modify-wrote (AMO) in timing mode
148template <class XC, class MemT>
149Fault
150initiateMemAMO(XC *xc, Trace::InstRecord *traceData, Addr addr, MemT& mem,
151               Request::Flags flags, AtomicOpFunctor *_amo_op)
152{
153    assert(_amo_op);
154    AtomicOpFunctorPtr amo_op = AtomicOpFunctorPtr(_amo_op);
155    return xc->initiateMemAMO(addr, sizeof(MemT), flags, std::move(amo_op));
156}
157
158#endif
159