dsp.isa revision 5268:5bfc53fe60e7 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2007 MIPS Technologies, Inc.
4// All rights reserved.
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met: redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer;
10// redistributions in binary form must reproduce the above copyright
11// notice, this list of conditions and the following disclaimer in the
12// documentation and/or other materials provided with the distribution;
13// neither the name of the copyright holders nor the names of its
14// contributors may be used to endorse or promote products derived from
15// this software without specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28//
29// Authors: Korey Sewell
30//          Brett Miller
31
32////////////////////////////////////////////////////////////////////
33//
34// DSP integer operate instructions
35//
36output header {{
37#include <iostream>
38    using namespace std;
39    /**
40     * Base class for integer operations.
41     */
42    class DspIntOp : public MipsStaticInst
43    {
44      protected:
45
46        /// Constructor
47        DspIntOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
48            MipsStaticInst(mnem, _machInst, __opClass)
49        {
50        }
51    };
52
53    class DspHiLoOp : public MipsStaticInst
54    {
55      protected:
56
57        /// Constructor
58        DspHiLoOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
59            MipsStaticInst(mnem, _machInst, __opClass)
60        {
61        }
62    };
63}};
64
65// Dsp instruction class execute method template.
66def template DspExecute {{
67        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, Trace::InstRecord *traceData) const
68        {
69                Fault fault = NoFault;
70
71                %(op_decl)s;
72
73                if (isDspPresent(xc))
74                {
75                    if (isDspEnabled(xc))
76                    {
77                        %(op_rd)s;
78                        %(code)s;
79                    }
80                    else
81                    {
82                        fault = new DspStateDisabledFault();
83                    }
84                }
85                else
86                {
87                    fault = new ReservedInstructionFault();
88                }
89
90                if(fault == NoFault)
91                {
92                    %(op_wb)s;
93                }
94                return fault;
95        }
96}};
97
98// DspHiLo instruction class execute method template.
99def template DspHiLoExecute {{
100        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, Trace::InstRecord *traceData) const
101        {
102                Fault fault = NoFault;
103
104                %(op_decl)s;
105
106                if (isDspPresent(xc))
107                {
108                    if (isDspEnabled(xc))
109                    {
110                        %(op_rd)s;
111                        %(code)s;
112                    }
113                    else
114                    {
115                        fault = new DspStateDisabledFault();
116                    }
117                }
118                else
119                {
120                    fault = new ReservedInstructionFault();
121                }
122
123                if(fault == NoFault)
124                {
125                    %(op_wb)s;
126                    //If there are 2 Destination Registers then
127                    //concatenate the values for the traceData
128                    if(traceData && _numDestRegs == 2) {
129                        // FIXME - set the trace value correctly here
130                        //uint64_t hilo_final_val = (uint64_t)HI_RD_SEL << 32 | LO_RD_SEL;
131                        //traceData->setData(hilo_final_val);
132                    }
133                }
134                return fault;
135        }
136}};
137
138//Outputs to decoder.cc
139output decoder {{
140}};
141
142output exec {{
143    bool isDspEnabled(%(CPU_exec_context)s *xc)
144    {
145#if FULL_SYSTEM
146        if( bits( xc->readMiscReg(MipsISA::Status), 24, 24 ) == 0 )
147            return false;
148#else
149        //printf("Syscall Emulation Mode: isDspEnabled() check defaults to TRUE\n");
150#endif
151        return true;
152    }
153}};
154
155output exec {{
156    bool isDspPresent(%(CPU_exec_context)s *xc)
157    {
158#if FULL_SYSTEM
159        if( bits( xc->readMiscReg(MipsISA::Config3), 10, 10 ) == 0 )
160            return false;
161#else
162        //printf("Syscall Emulation Mode: isDspPresent() check defaults to TRUE\n");
163#endif
164        return true;
165    }
166}};
167
168// add code to fetch the DSPControl register
169// and write it back after execution, giving
170// the instruction the opportunity to modify
171// it if necessary
172def format DspIntOp(code, *opt_flags) {{
173
174    decl_code = 'uint32_t dspctl;\n'
175    decl_code += 'dspctl = DSPControl;\n'
176
177    write_code = 'DSPControl = dspctl;\n'
178
179    code = decl_code + code + write_code
180
181    opt_flags += ('IsDspOp',)
182
183    iop = InstObjParams(name, Name, 'DspIntOp', code, opt_flags)
184    header_output = BasicDeclare.subst(iop)
185    decoder_output = BasicConstructor.subst(iop)
186    decode_block = BasicDecode.subst(iop)
187    exec_output = DspExecute.subst(iop)
188}};
189
190// add code to fetch the DSPControl register
191// and write it back after execution, giving
192// the instruction the opportunity to modify
193// it if necessary; also, fetch the appropriate
194// HI/LO register pair, based on the AC
195// instruction field.
196
197def format DspHiLoOp(code, *opt_flags) {{
198
199    decl_code = 'int64_t dspac;\n'
200    decl_code += 'uint32_t dspctl;\n'
201
202    fetch_code = 'dspctl = DSPControl;\n'
203    fetch_code += 'dspac = HI_RD_SEL;\n'
204    fetch_code += 'dspac = dspac << 32 | LO_RD_SEL;\n'
205
206    write_code = 'DSPControl = dspctl;\n'
207    write_code += 'HI_RD_SEL = dspac<63:32>;\n'
208    write_code += 'LO_RD_SEL = dspac<31:0>;\n'
209
210    code = decl_code + fetch_code + code + write_code
211
212    opt_flags += ('IsDspOp',)
213
214    iop = InstObjParams(name, Name, 'DspHiLoOp', code, opt_flags)
215    header_output = BasicDeclare.subst(iop)
216    decoder_output = BasicConstructor.subst(iop)
217    decode_block = BasicDecode.subst(iop)
218    exec_output = DspHiLoExecute.subst(iop)
219
220}};
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224