base_gic.cc revision 12739 
1/*
2 * Copyright (c) 2012, 2017-2018 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 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
40#include "dev/arm/base_gic.hh"
41
42#include "cpu/thread_context.hh"
43#include "dev/arm/realview.hh"
44#include "params/ArmInterruptPin.hh"
45#include "params/ArmPPI.hh"
46#include "params/ArmSPI.hh"
47#include "params/BaseGic.hh"
48
49BaseGic::BaseGic(const Params *p)
50        : PioDevice(p),
51          platform(p->platform)
52{
53    RealView *const rv(dynamic_cast<RealView*>(p->platform));
54    // The platform keeps track of the GIC that is hooked up to the
55    // system. Due to quirks in gem5's configuration system, the
56    // platform can't take a GIC as parameter. Instead, we need to
57    // register with the platform when a new GIC is created. If we
58    // can't find a platform, something is seriously wrong.
59    fatal_if(!rv, "GIC model can't register with platform code");
60    rv->setGic(this);
61}
62
63BaseGic::~BaseGic()
64{
65}
66
67const BaseGic::Params *
68BaseGic::params() const
69{
70    return dynamic_cast<const Params *>(_params);
71}
72
73
74ArmInterruptPin::ArmInterruptPin(const ArmInterruptPinParams *p)
75    : SimObject(p),
76      threadContext(nullptr),
77      platform(dynamic_cast<RealView*>(p->platform)),
78      intNum(p->num)
79{
80    fatal_if(!platform, "Interrupt not connected to a RealView platform");
81}
82
83void
84ArmInterruptPin::setThreadContext(ThreadContext *tc)
85{
86    panic_if(threadContext,
87             "InterruptLine::setThreadContext called twice\n");
88
89    threadContext = tc;
90}
91
92ContextID
93ArmInterruptPin::targetContext() const
94{
95    panic_if(!threadContext, "Per-context interrupt triggered without a " \
96             "call to InterruptLine::setThreadContext.\n");
97    return threadContext->contextId();
98}
99
100
101
102ArmSPI::ArmSPI(const ArmSPIParams *p)
103    : ArmInterruptPin(p)
104{
105}
106
107void
108ArmSPI::raise()
109{
110    platform->gic->sendInt(intNum);
111}
112
113void
114ArmSPI::clear()
115{
116    platform->gic->clearInt(intNum);
117}
118
119ArmPPI::ArmPPI(const ArmPPIParams *p)
120    : ArmInterruptPin(p)
121{
122}
123
124void
125ArmPPI::raise()
126{
127    platform->gic->sendPPInt(intNum, targetContext());
128}
129
130void
131ArmPPI::clear()
132{
133    platform->gic->clearPPInt(intNum, targetContext());
134}
135
136
137ArmSPI *
138ArmSPIParams::create()
139{
140    return new ArmSPI(this);
141}
142
143ArmPPI *
144ArmPPIParams::create()
145{
146    return new ArmPPI(this);
147}
148