isa.hh revision 8181 
1/*
2 * Copyright (c) 2009 The Regents of The University of Michigan
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: Gabe Black
29 */
30
31#ifndef __ARCH_MIPS_ISA_HH__
32#define __ARCH_MIPS_ISA_HH__
33
34#include <string>
35#include <queue>
36#include <vector>
37
38#include "arch/mips/registers.hh"
39#include "arch/mips/types.hh"
40#include "sim/eventq.hh"
41#include "sim/fault_fwd.hh"
42
43class BaseCPU;
44class Checkpoint;
45class EventManager;
46class ThreadContext;
47
48namespace MipsISA
49{
50    class ISA
51    {
52      public:
53        // The MIPS name for this file is CP0 or Coprocessor 0
54        typedef ISA CP0;
55
56      protected:
57        // Number of threads and vpes an individual ISA state can handle
58        uint8_t numThreads;
59        uint8_t numVpes;
60
61        enum BankType {
62            perProcessor,
63            perThreadContext,
64            perVirtProcessor
65        };
66
67        std::vector<std::vector<MiscReg> > miscRegFile;
68        std::vector<std::vector<MiscReg> > miscRegFile_WriteMask;
69        std::vector<BankType> bankType;
70
71      public:
72        ISA(uint8_t num_threads = 1, uint8_t num_vpes = 1);
73
74        void clear();
75
76        void configCP();
77
78        unsigned getVPENum(ThreadID tid);
79
80        //////////////////////////////////////////////////////////
81        //
82        // READ/WRITE CP0 STATE
83        //
84        //
85        //////////////////////////////////////////////////////////
86        //@TODO: MIPS MT's register view automatically connects
87        //       Status to TCStatus depending on current thread
88        void updateCP0ReadView(int misc_reg, ThreadID tid) { }
89        MiscReg readMiscRegNoEffect(int misc_reg, ThreadID tid = 0);
90
91        //template <class TC>
92        MiscReg readMiscReg(int misc_reg,
93                            ThreadContext *tc, ThreadID tid = 0);
94
95        MiscReg filterCP0Write(int misc_reg, int reg_sel, const MiscReg &val);
96        void setRegMask(int misc_reg, const MiscReg &val, ThreadID tid = 0);
97        void setMiscRegNoEffect(int misc_reg, const MiscReg &val,
98                                ThreadID tid = 0);
99
100        //template <class TC>
101        void setMiscReg(int misc_reg, const MiscReg &val,
102                        ThreadContext *tc, ThreadID tid = 0);
103
104        //////////////////////////////////////////////////////////
105        //
106        // DECLARE INTERFACE THAT WILL ALLOW A MiscRegFile (Cop0)
107        // TO SCHEDULE EVENTS
108        //
109        //////////////////////////////////////////////////////////
110
111        // Flag that is set when CP0 state has been written to.
112        bool cp0Updated;
113
114        // Enumerated List of CP0 Event Types
115        enum CP0EventType {
116            UpdateCP0
117        };
118
119        // Declare A CP0Event Class for scheduling
120        class CP0Event : public Event
121        {
122          protected:
123            ISA::CP0 *cp0;
124            BaseCPU *cpu;
125            CP0EventType cp0EventType;
126            Fault fault;
127
128          public:
129            /** Constructs a CP0 event. */
130            CP0Event(CP0 *_cp0, BaseCPU *_cpu, CP0EventType e_type);
131
132            /** Process this event. */
133            virtual void process();
134
135            /** Returns the description of this event. */
136            const char *description() const;
137
138            /** Schedule This Event */
139            void scheduleEvent(int delay);
140
141            /** Unschedule This Event */
142            void unscheduleEvent();
143        };
144
145        // Schedule a CP0 Update Event
146        void scheduleCP0Update(BaseCPU *cpu, int delay = 0);
147
148        // If any changes have been made, then check the state for changes
149        // and if necessary alert the CPU
150        void updateCPU(BaseCPU *cpu);
151
152        // Keep a List of CPU Events that need to be deallocated
153        std::queue<CP0Event*> cp0EventRemoveList;
154
155        static std::string miscRegNames[NumMiscRegs];
156
157      public:
158
159        int
160        flattenIntIndex(int reg)
161        {
162            return reg;
163        }
164
165        int
166        flattenFloatIndex(int reg)
167        {
168            return reg;
169        }
170
171        void serialize(EventManager *em, std::ostream &os)
172        {}
173        void unserialize(EventManager *em, Checkpoint *cp,
174                const std::string &section)
175        {}
176    };
177}
178
179#endif
180