memhelpers.hh revision 11303:f694764d656d 
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 "base/types.hh"
47#include "mem/request.hh"
48#include "sim/byteswap.hh"
49#include "sim/insttracer.hh"
50
51/// Initiate a read from memory in timing mode.  Note that the 'mem'
52/// parameter is unused; only the type of that parameter is used
53/// to determine the size of the access.
54template <class XC, class MemT>
55Fault
56initiateMemRead(XC *xc, Trace::InstRecord *traceData, Addr addr,
57                MemT &mem, unsigned flags)
58{
59    return xc->initiateMemRead(addr, sizeof(MemT), flags);
60}
61
62/// Extract the data returned from a timing mode read.
63template <class MemT>
64void
65getMem(PacketPtr pkt, MemT &mem, Trace::InstRecord *traceData)
66{
67    mem = pkt->get<MemT>();
68    if (traceData)
69        traceData->setData(mem);
70}
71
72/// Read from memory in atomic mode.
73template <class XC, class MemT>
74Fault
75readMemAtomic(XC *xc, Trace::InstRecord *traceData, Addr addr, MemT &mem,
76        unsigned flags)
77{
78    memset(&mem, 0, sizeof(mem));
79    Fault fault = xc->readMem(addr, (uint8_t *)&mem, sizeof(MemT), flags);
80    if (fault == NoFault) {
81        mem = TheISA::gtoh(mem);
82        if (traceData)
83            traceData->setData(mem);
84    }
85    return fault;
86}
87
88/// Write to memory in timing mode.
89template <class XC, class MemT>
90Fault
91writeMemTiming(XC *xc, Trace::InstRecord *traceData, MemT mem, Addr addr,
92        unsigned flags, uint64_t *res)
93{
94    if (traceData) {
95        traceData->setData(mem);
96    }
97    mem = TheISA::htog(mem);
98    return xc->writeMem((uint8_t *)&mem, sizeof(MemT), addr, flags, res);
99}
100
101/// Write to memory in atomic mode.
102template <class XC, class MemT>
103Fault
104writeMemAtomic(XC *xc, Trace::InstRecord *traceData, const MemT &mem,
105        Addr addr, unsigned flags, uint64_t *res)
106{
107    if (traceData) {
108        traceData->setData(mem);
109    }
110    MemT host_mem = TheISA::htog(mem);
111    Fault fault =
112          xc->writeMem((uint8_t *)&host_mem, sizeof(MemT), addr, flags, res);
113    if (fault == NoFault && res != NULL) {
114        if (flags & Request::MEM_SWAP || flags & Request::MEM_SWAP_COND)
115            *res = TheISA::gtoh((MemT)*res);
116        else
117            *res = TheISA::gtoh(*res);
118    }
119    return fault;
120}
121
122#endif
123