dsp.isa revision 12429:beefb9f5f551 
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(
68            ExecContext *xc, Trace::InstRecord *traceData) const
69        {
70                Fault fault = NoFault;
71
72                %(op_decl)s;
73
74                if (isDspPresent(xc))
75                {
76                    if (isDspEnabled(xc))
77                    {
78                        %(op_rd)s;
79                        %(code)s;
80                    }
81                    else
82                    {
83                        fault = std::make_shared<DspStateDisabledFault>();
84                    }
85                }
86                else
87                {
88                    fault = std::make_shared<ReservedInstructionFault>();
89                }
90
91                if(fault == NoFault)
92                {
93                    %(op_wb)s;
94                }
95                return fault;
96        }
97}};
98
99// DspHiLo instruction class execute method template.
100def template DspHiLoExecute {{
101        Fault %(class_name)s::execute(
102            ExecContext *xc, Trace::InstRecord *traceData) const
103        {
104                Fault fault = NoFault;
105
106                %(op_decl)s;
107
108                if (isDspPresent(xc))
109                {
110                    if (isDspEnabled(xc))
111                    {
112                        %(op_rd)s;
113                        %(code)s;
114                    }
115                    else
116                    {
117                        fault = std::make_shared<DspStateDisabledFault>();
118                    }
119                }
120                else
121                {
122                    fault = std::make_shared<ReservedInstructionFault>();
123                }
124
125                if(fault == NoFault)
126                {
127                    %(op_wb)s;
128                    //If there are 2 Destination Registers then
129                    //concatenate the values for the traceData
130                    if(traceData && _numDestRegs == 2) {
131                        // FIXME - set the trace value correctly here
132                        //uint64_t hilo_final_val = (uint64_t)HI_RD_SEL << 32 | LO_RD_SEL;
133                        //traceData->setData(hilo_final_val);
134                    }
135                }
136                return fault;
137        }
138}};
139
140output header {{
141    bool isDspEnabled(ExecContext *xc);
142
143    bool isDspPresent(ExecContext *xc);
144}};
145
146//Outputs to decoder.cc
147output decoder {{
148}};
149
150output exec {{
151    bool
152    isDspEnabled(ExecContext *xc)
153    {
154        return !FullSystem || bits(xc->readMiscReg(MISCREG_STATUS), 24);
155    }
156}};
157
158output exec {{
159    bool
160    isDspPresent(ExecContext *xc)
161    {
162        return !FullSystem || bits(xc->readMiscReg(MISCREG_CONFIG3), 10);
163    }
164}};
165
166// add code to fetch the DSPControl register
167// and write it back after execution, giving
168// the instruction the opportunity to modify
169// it if necessary
170def format DspIntOp(code, *opt_flags) {{
171
172    decl_code = 'uint32_t dspctl;\n'
173    decl_code += 'dspctl = DSPControl;\n'
174
175    write_code = 'DSPControl = dspctl;\n'
176
177    code = decl_code + code + write_code
178
179    opt_flags += ('IsDspOp',)
180
181    iop = InstObjParams(name, Name, 'DspIntOp', code, opt_flags)
182    header_output = BasicDeclare.subst(iop)
183    decoder_output = BasicConstructor.subst(iop)
184    decode_block = BasicDecode.subst(iop)
185    exec_output = DspExecute.subst(iop)
186}};
187
188// add code to fetch the DSPControl register
189// and write it back after execution, giving
190// the instruction the opportunity to modify
191// it if necessary; also, fetch the appropriate
192// HI/LO register pair, based on the AC
193// instruction field.
194
195def format DspHiLoOp(code, *opt_flags) {{
196
197    decl_code = 'int64_t dspac;\n'
198    decl_code += 'uint32_t dspctl;\n'
199
200    fetch_code = 'dspctl = DSPControl;\n'
201    fetch_code += 'dspac = HI_RD_SEL;\n'
202    fetch_code += 'dspac = dspac << 32 | LO_RD_SEL;\n'
203
204    write_code = 'DSPControl = dspctl;\n'
205    write_code += 'HI_RD_SEL = dspac<63:32>;\n'
206    write_code += 'LO_RD_SEL = dspac<31:0>;\n'
207
208    code = decl_code + fetch_code + code + write_code
209
210    opt_flags += ('IsDspOp',)
211
212    iop = InstObjParams(name, Name, 'DspHiLoOp', code, opt_flags)
213    header_output = BasicDeclare.subst(iop)
214    decoder_output = BasicConstructor.subst(iop)
215    decode_block = BasicDecode.subst(iop)
216    exec_output = DspHiLoExecute.subst(iop)
217
218}};
219
220
221
222