/*!
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/*!
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AEMB INSTRUCTION SET SIMULATOR
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AEMB INSTRUCTION SET SIMULATOR
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Copyright (C) 2009 Shawn Tan
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Copyright (C) 2009 Shawn Tan
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This program is free software: you can redistribute it and/or modify
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see
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along with this program. If not, see
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.
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.
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*/
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*/
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#ifndef AEMBINSTRUCTION_H_
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#ifndef AEMBINSTRUCTION_H_
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#define AEMBINSTRUCTION_H_
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#define AEMBINSTRUCTION_H_
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using namespace std;
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using namespace std;
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namespace aemb
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namespace aemb
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{
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{
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typedef enum
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typedef enum
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{
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{
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OPC_ADD = 000,
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OPC_ADD = 000,
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OPC_RSUB = 001,
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OPC_RSUB = 001,
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OPC_ADDC = 002,
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OPC_ADDC = 002,
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OPC_RSUBC = 003,
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OPC_RSUBC = 003,
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OPC_ADDK = 004,
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OPC_ADDK = 004,
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OPC_RSUBK = 005,
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OPC_RSUBK = 005,
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OPC_ADDKC = 006,
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OPC_ADDKC = 006,
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OPC_RSUBKC = 007,
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OPC_RSUBKC = 007,
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OPC_CMP = 005,
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OPC_CMP = 005,
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OPC_CMPU = 005,
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OPC_CMPU = 005,
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OPC_ADDI = 010,
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OPC_ADDI = 010,
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OPC_RSUBI = 011,
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OPC_RSUBI = 011,
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OPC_ADDIC = 012,
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OPC_ADDIC = 012,
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OPC_RSUBIC = 013,
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OPC_RSUBIC = 013,
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OPC_ADDIK = 014,
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OPC_ADDIK = 014,
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OPC_RSUBIK = 015,
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OPC_RSUBIK = 015,
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OPC_ADDIKC = 016,
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OPC_ADDIKC = 016,
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OPC_RSUBIKC = 017,
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OPC_RSUBIKC = 017,
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OPC_MUL = 020,
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OPC_MUL = 020,
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OPC_BSRL = 021,
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OPC_BSRL = 021,
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OPC_BSRA = 021,
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OPC_BSRA = 021,
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OPC_BSLL = 021,
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OPC_BSLL = 021,
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OPC_MULI = 030,
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OPC_MULI = 030,
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OPC_BSRLI = 031,
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OPC_BSRLI = 031,
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OPC_BSRAI = 031,
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OPC_BSRAI = 031,
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OPC_BSLLI = 031,
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OPC_BSLLI = 031,
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OPC_IDIV = 032,
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OPC_IDIV = 032,
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OPC_IDIVU = 032,
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OPC_IDIVU = 032,
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OPC_OR = 040,
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OPC_OR = 040,
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OPC_AND = 041,
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OPC_AND = 041,
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OPC_XOR = 042,
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OPC_XOR = 042,
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OPC_ANDN = 043,
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OPC_ANDN = 043,
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} opcodes;
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} opcodes;
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/**
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/**
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* FetchUnit formats.
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* FetchUnit formats.
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*/
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*/
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union uInstFormat
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union uInstFormat
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{
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{
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int word;
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int word;
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/**
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/**
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* R-format opcode
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* R-format opcode
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*/
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*/
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struct sFormatR
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struct sFormatR
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{
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{
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int im:11; // reserved
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int im:11; // reserved
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unsigned int rb:5; // rb
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unsigned int rb:5; // rb
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unsigned int ra:5; // ra
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unsigned int ra:5; // ra
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unsigned int rd:5; // rd
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unsigned int rd:5; // rd
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unsigned int op:6; // opcode
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unsigned int op:6; // opcode
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} r;
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} r;
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/**
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/**
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* I-format opcode
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* I-format opcode
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*/
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*/
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struct sFormatI
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struct sFormatI
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{
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{
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int im:16; // immediate
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int im:16; // immediate
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unsigned int ra:5; // ra
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unsigned int ra:5; // ra
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unsigned int rd:5; // rd
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unsigned int rd:5; // rd
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unsigned int op:6; // opcode
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unsigned int op:6; // opcode
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} i;
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} i;
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};
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};
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typedef uInstFormat InstFormat;
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typedef uInstFormat InstFormat;
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class FetchUnit
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class FetchUnit
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{
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{
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int r_pc;
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int r_pc;
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public:
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public:
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void reset();
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void reset();
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/**
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/**
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* Tokenise instructions.
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* Tokenise instructions.
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* Decode the raw instructions into the opcode structure.
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* Decode the raw instructions into the opcode structure.
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* @param opc Opcode raw value
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* @param opc Opcode raw value
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* @return structure holding the opcode
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* @return structure holding the opcode
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*/
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*/
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InstFormat tokInst(const int opc);
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InstFormat tokInst(const int opc);
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/**
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/**
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* Get PC
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* Get PC
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*/
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*/
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int getPC();
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int getPC();
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/**
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/**
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* Set PC
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* Set PC
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*/
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*/
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void setPC(const int pc);
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void setPC(const int pc);
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FetchUnit();
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FetchUnit();
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virtual ~FetchUnit();
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virtual ~FetchUnit();
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};
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};
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}
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}
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#endif /*InstRUCTION_H_*/
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#endif /*InstRUCTION_H_*/
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