interrupts.hh revision 9656 
1/*
2 * Copyright (c) 2010,2012 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) 2006 The Regents of The University of Michigan
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: Ali Saidi
41 */
42
43#ifndef __ARCH_ARM_INTERRUPT_HH__
44#define __ARCH_ARM_INTERRUPT_HH__
45
46#include "arch/arm/faults.hh"
47#include "arch/arm/isa_traits.hh"
48#include "arch/arm/miscregs.hh"
49#include "arch/arm/registers.hh"
50#include "cpu/thread_context.hh"
51#include "debug/Interrupt.hh"
52#include "params/ArmInterrupts.hh"
53#include "sim/sim_object.hh"
54
55namespace ArmISA
56{
57
58class Interrupts : public SimObject
59{
60  private:
61    BaseCPU * cpu;
62
63    bool interrupts[NumInterruptTypes];
64    uint64_t intStatus;
65
66  public:
67
68    void
69    setCPU(BaseCPU * _cpu)
70    {
71        cpu = _cpu;
72    }
73
74    typedef ArmInterruptsParams Params;
75
76    const Params *
77    params() const
78    {
79        return dynamic_cast<const Params *>(_params);
80    }
81
82    Interrupts(Params * p) : SimObject(p), cpu(NULL)
83    {
84        clearAll();
85    }
86
87
88    void
89    post(int int_num, int index)
90    {
91        DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
92
93        if (int_num < 0 || int_num >= NumInterruptTypes)
94            panic("int_num out of bounds\n");
95
96        if (index != 0)
97            panic("No support for other interrupt indexes\n");
98
99        interrupts[int_num] = true;
100        intStatus |= ULL(1) << int_num;
101    }
102
103    void
104    clear(int int_num, int index)
105    {
106        DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
107
108        if (int_num < 0 || int_num >= NumInterruptTypes)
109            panic("int_num out of bounds\n");
110
111        if (index != 0)
112            panic("No support for other interrupt indexes\n");
113
114        interrupts[int_num] = false;
115        intStatus &= ~(ULL(1) << int_num);
116    }
117
118    void
119    clearAll()
120    {
121        DPRINTF(Interrupt, "Interrupts all cleared\n");
122        intStatus = 0;
123        memset(interrupts, 0, sizeof(interrupts));
124    }
125
126    bool
127    checkInterrupts(ThreadContext *tc) const
128    {
129        if (!intStatus)
130            return false;
131
132        CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
133
134        return ((interrupts[INT_IRQ] && !cpsr.i) ||
135                (interrupts[INT_FIQ] && !cpsr.f) ||
136                (interrupts[INT_ABT] && !cpsr.a) ||
137                (interrupts[INT_RST]) ||
138                (interrupts[INT_SEV]));
139    }
140
141    /**
142     * Check the raw interrupt state.
143     * This function is used to check if a wfi operation should sleep. If there
144     * is an interrupt pending, even if it's masked, wfi doesn't sleep.
145     * @return any interrupts pending
146     */
147    bool
148    checkRaw() const
149    {
150        return intStatus;
151    }
152
153    /**
154     * Check the state of a particular interrupt, ignoring CPSR masks.
155     *
156     * This method is primarily used when running the target CPU in a
157     * hardware VM (e.g., KVM) to check if interrupts should be
158     * delivered upon guest entry.
159     *
160     * @param interrupt Interrupt type to check the state of.
161     * @return true if the interrupt is asserted, false otherwise.
162     */
163    bool
164    checkRaw(InterruptTypes interrupt) const
165    {
166        if (interrupt >= NumInterruptTypes)
167            panic("Interrupt number out of range.\n");
168
169        return interrupts[interrupt];
170    }
171
172    Fault
173    getInterrupt(ThreadContext *tc)
174    {
175        if (!intStatus)
176            return NoFault;
177
178        CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
179
180        if (interrupts[INT_IRQ] && !cpsr.i)
181            return new Interrupt;
182        if (interrupts[INT_FIQ] && !cpsr.f)
183            return new FastInterrupt;
184        if (interrupts[INT_ABT] && !cpsr.a)
185            return new DataAbort(0, false, 0,
186                    ArmFault::AsynchronousExternalAbort);
187        if (interrupts[INT_RST])
188           return new Reset;
189        if (interrupts[INT_SEV])
190           return new ArmSev;
191
192        panic("intStatus and interrupts not in sync\n");
193    }
194
195    void
196    updateIntrInfo(ThreadContext *tc)
197    {
198        ; // nothing to do
199    }
200
201    void
202    serialize(std::ostream &os)
203    {
204        SERIALIZE_ARRAY(interrupts, NumInterruptTypes);
205        SERIALIZE_SCALAR(intStatus);
206    }
207
208    void
209    unserialize(Checkpoint *cp, const std::string &section)
210    {
211        UNSERIALIZE_ARRAY(interrupts, NumInterruptTypes);
212        UNSERIALIZE_SCALAR(intStatus);
213    }
214};
215} // namespace ARM_ISA
216
217#endif // __ARCH_ARM_INTERRUPT_HH__
218