mmapped_ipr.cc revision 11793:ef606668d247 
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
33#include "mem/packet.hh"
34#include "mem/packet_access.hh"
35#include "sim/pseudo_inst.hh"
36
37using namespace GenericISA;
38
39static void
40handlePseudoInst(ThreadContext *xc, Packet *pkt)
41{
42    const Addr offset(pkt->getAddr() & IPR_IN_CLASS_MASK);
43    const uint8_t func((offset >> 8) & 0xFF);
44    const uint8_t subfunc(offset & 0xFF);
45    uint64_t ret;
46
47    assert((offset >> 16) == 0);
48    ret = PseudoInst::pseudoInst(xc, func, subfunc);
49    if (pkt->isRead())
50        pkt->set(ret);
51}
52
53Cycles
54GenericISA::handleGenericIprRead(ThreadContext *xc, Packet *pkt)
55{
56    Addr va(pkt->getAddr());
57    Addr cls(va >> IPR_CLASS_SHIFT);
58
59    switch (cls) {
60    case IPR_CLASS_PSEUDO_INST:
61        handlePseudoInst(xc, pkt);
62        break;
63    default:
64        panic("Unhandled generic IPR read: 0x%x\n", va);
65    }
66
67    return Cycles(1);
68}
69
70Cycles
71GenericISA::handleGenericIprWrite(ThreadContext *xc, Packet *pkt)
72{
73    Addr va(pkt->getAddr());
74    Addr cls(va >> IPR_CLASS_SHIFT);
75
76    switch (cls) {
77    case IPR_CLASS_PSEUDO_INST:
78        handlePseudoInst(xc, pkt);
79        break;
80    default:
81        panic("Unhandled generic IPR write: 0x%x\n", va);
82    }
83
84    return Cycles(1);
85}
86