mmapped_ipr.cc revision 9897:e105fbf799e7 
1/*
2 * Copyright (c) 2013 Andreas Sandberg
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: Andreas Sandberg
29 */
30
31#include "arch/generic/mmapped_ipr.hh"
32#include "mem/packet.hh"
33#include "mem/packet_access.hh"
34#include "sim/pseudo_inst.hh"
35
36using namespace GenericISA;
37
38static void
39handlePseudoInst(ThreadContext *xc, Packet *pkt)
40{
41    const Addr offset(pkt->getAddr() & IPR_IN_CLASS_MASK);
42    const uint8_t func((offset >> 8) & 0xFF);
43    const uint8_t subfunc(offset & 0xFF);
44    uint64_t ret;
45
46    assert((offset >> 16) == 0);
47    ret = PseudoInst::pseudoInst(xc, func, subfunc);
48    if (pkt->isRead())
49        pkt->set(ret);
50}
51
52Cycles
53GenericISA::handleGenericIprRead(ThreadContext *xc, Packet *pkt)
54{
55    Addr va(pkt->getAddr());
56    Addr cls((va & IPR_CLASS_MASK) >> IPR_CLASS_SHIFT);
57
58    switch (cls) {
59    case IPR_CLASS_PSEUDO_INST:
60        handlePseudoInst(xc, pkt);
61        break;
62    default:
63        panic("Unhandled generic IPR read: 0x%x\n", va);
64    }
65
66    return Cycles(1);
67}
68
69Cycles
70GenericISA::handleGenericIprWrite(ThreadContext *xc, Packet *pkt)
71{
72    Addr va(pkt->getAddr());
73    Addr cls((va & IPR_CLASS_MASK) >> IPR_CLASS_SHIFT);
74
75    switch (cls) {
76    case IPR_CLASS_PSEUDO_INST:
77        handlePseudoInst(xc, pkt);
78        break;
79    default:
80        panic("Unhandled generic IPR write: 0x%x\n", va);
81    }
82
83    return Cycles(1);
84}
85