colin
/
risc-v-tlm
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

first version of C.extensions

This commit is contained in:
mariusmonton 2018-10-15 17:35:16 +02:00
parent 97b15ca7a3
commit 374b853117
2 changed files with 484 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

375
inc/C_Instruction.h Normal file
View File

@ -0,0 +1,375 @@
/*!
\file Instruction.h
\brief Decode instructions part of the RISC-V
\author Màrius Montón
\date August 2018
*/
#ifndef C_INSTRUCTION__H
#define C_INSTRUCTION__H
#include "systemc"
using namespace sc_core;
using namespace sc_dt;
using namespace std;
typedef enum {
OP_C_ADDI4SPN,
OP_C_FLD,
OP_C_LW,
OP_C_FLW,
OP_C_FSD,
OP_C_SW,
OP_C_FSW,
OP_C_NOP,
OP_C_ADDI,
OP_C_JAL,
OP_C_LI,
OP_C_ADDI16SP,
OP_C_LUI,
OP_C_SRLI,
OP_C_SRAI,
OP_C_ANDI,
OP_C_SUB,
OP_C_XOR,
OP_C_OR,
OP_C_AND,
OP_C_J,
OP_C_BEQZ,
OP_C_BNEZ,
OP_C_SLLI,
OP_C_FLDSP,
OP_C_LWSP,
OP_C_FLWSP,
OP_C_JR,
OP_C_MV,
OP_C_EBREAK,
OP_C_JALR,
OP_C_ADD,
OP_C_FSDSP,
OP_C_SWSP,
OP_C_FSWSP,
OP_C_ERROR
} op_C_Codes;
typedef enum {
C_ADDI4SPN = 0b000,
C_FLD = 0b001,
C_LW = 0b010,
C_FLW = 0b011,
C_FSD = 0b101,
C_SW = 0b110,
C_FSW = 0b111,
C_ADDI = 0b000,
C_JAL = 0b001,
C_LI = 0b010,
C_ADDI16SP = 0b011,
C_SRLI = 0b100,
C_J = 0b101,
C_BEQZ = 0b110,
C_BNEZ = 0b111,
C_SLLI = 0b000,
C_FLDSP = 0b001,
C_LWSP = 0b010,
C_FLWSP = 0b011,
C_JR = 0b100,
C_FDSP = 0b101,
C_SWSP = 0b110,
C_FWWSP = 0b111,
} C_Codes;
/**
* @brief Instruction decoding and fields access
*/
class C_Instruction{
public:
/**
* @brief Constructor
* @param instr Instruction to decode
*/
C_Instruction(sc_uint<32> instr);
/**
* @brief Access to opcode field
* @return return opcode field
*/
inline int32_t opcode() {
return m_instr.range(1,0);
}
/**
* @brief Access to rd field
* @return rd field
*/
inline int32_t get_rd() {
return m_instr.range(11, 7);
}
inline void set_rd(int32_t value) {
m_instr.range(11,7) = value;
}
inline int32_t get_rdp() {
return m_instr.range(4, 2);
}
/**
* @brief Access to rs1 field
* @return rs1 field
*/
inline int32_t get_rs1() {
return m_instr.range(11, 7);
}
inline void set_rs1(int32_t value) {
m_instr.range(11,7) = value;
}
inline int32_t get_rs1p() {
return m_instr.range(9, 7);
}
/**
* @brief Access to rs2 field
* @return rs2 field
*/
inline int32_t get_rs2() {
return m_instr.range(6, 2);
}
inline void set_rs2(int32_t value) {
m_instr.range(6,2) = value;
}
inline int32_t get_funct3() {
return m_instr.range(15, 13);
}
inline void set_funct3(int32_t value) {
m_instr.range(15,13) = value;
}
/**
* @brief Access to immediate field for I-type
* @return immediate_I field
*/
inline int32_t get_imm_I() {
int32_t aux = 0;
aux = m_instr.range(31, 20);
/* sign extension (optimize) */
if (m_instr[31] == 1) {
aux |= (0b11111111111111111111) << 12;
}
return aux;
}
inline void set_imm_I(int32_t value) {
m_instr.range(31,20) = value;
}
/**
* @brief Access to immediate field for S-type
* @return immediate_S field
*/
inline int32_t get_imm_S() {
int32_t aux = 0;
aux = m_instr.range(31, 25) << 5;
aux |= m_instr.range(11,7);
if (m_instr[31] == 1) {
aux |= (0b11111111111111111111) << 12;
}
return aux;
}
inline void set_imm_S(int32_t value) {
sc_uint<32> aux = value;
m_instr.range(31,25) = aux.range(11,5);
m_instr.range(11,7) = aux.range(4,0);
}
/**
* @brief Access to immediate field for U-type
* @return immediate_U field
*/
inline int32_t get_imm_U() {
return m_instr.range(31, 12);
}
inline void set_imm_U(int32_t value) {
m_instr.range(31,12) = (value << 12);
}
/**
* @brief Access to immediate field for B-type
* @return immediate_B field
*/
inline int32_t get_imm_B() {
int32_t aux = 0;
aux |= m_instr[7] << 11;
aux |= m_instr.range(30, 25) << 5;
aux |= m_instr[31] << 12;
aux |= m_instr.range(11, 8) << 1;
if (m_instr[31] == 1) {
aux |= (0b11111111111111111111) << 12;
}
return aux;
}
inline void set_imm_B(int32_t value) {
sc_uint<32> aux = value;
m_instr[31] = aux[12];
m_instr.range(30,25) = aux.range(10,5);
m_instr.range(11,7) = aux.range(4,1);
m_instr[6] = aux[11];
}
/**
* @brief Access to immediate field for J-type
* @return immediate_J field
*/
inline int32_t get_imm_J() {
int32_t aux = 0;
aux = m_instr[12] << 11;
aux |= m_instr[11] << 4;
aux |= m_instr[10] << 9;
aux |= m_instr[9] << 8;
aux |= m_instr[8] << 10;
aux |= m_instr[7] << 6;
aux |= m_instr[6] << 7;
aux |= m_instr.range(5,3) << 1;
aux |= m_instr[2] << 5;
return aux;
}
inline void set_imm_J(int32_t value) {
sc_uint<32> aux = (value << 20);
m_instr[31] = aux[20];
m_instr.range(30,21) = aux.range(10,1);
m_instr[20] = aux[11];
m_instr.range(19,12) = aux.range(19,12);
}
inline int32_t get_imm_L() {
int32_t aux = 0;
aux = m_instr.range(12,10) << 3;
aux |= m_instr[6] << 2;
aux |= m_instr[5] << 6;
return aux;
}
inline int32_t get_imm_LWSP() {
int32_t aux = 0;
aux = m_instr[12] << 5;
aux |= m_instr.range(6,4) << 4;
aux |= m_instr.range(3,2) << 6;
return aux;
}
inline int32_t get_imm_ADDI() {
int32_t aux = 0;
aux = m_instr[12] << 5;
aux |= m_instr.range(6,2);
return aux;
}
inline int32_t get_imm_ADDI4SPN() {
int32_t aux = 0;
aux = m_instr.range(12,11) << 5;
aux |= m_instr.range(10,7) << 6;
aux |= m_instr[6] << 2;
aux |= m_instr[5] << 3;
return aux;
}
inline int32_t get_imm_ADDI16SP() {
int32_t aux = 0;
aux = m_instr[12] << 9;
aux |= m_instr[6] << 4;
aux |= m_instr[5] << 6;
aux |= m_instr[4] << 8;
aux |= m_instr[3] << 7;
aux |= m_instr[2] << 5;
if (m_instr[12] == 1) {
aux |= 0b1111111111111111111111 << 10;
}
return aux;
}
inline int32_t get_imm_CSS() {
int32_t aux = 0;
aux = m_instr.range(12,9) << 2;
aux |= m_instr.range(8,7) << 6;
return aux;
}
inline int32_t get_imm_CB() {
int32_t aux = 0;
aux = m_instr[12] << 8;
aux |= m_instr[11] << 4;
aux |= m_instr[10] << 3;
aux |= m_instr[6] << 7;
aux |= m_instr[5] << 6;
aux |= m_instr[4] << 2;
aux |= m_instr[3] << 1;
aux |= m_instr[2] << 5;
if (m_instr[12] == 1) {
aux |= 0b11111111111111111111111 << 9;
}
return aux;
}
inline int32_t get_csr() {
return get_imm_I();
}
/**
* @brief Decodes opcode of instruction
* @return opcode of instruction
*/
op_C_Codes decode();
inline void dump() {
cout << hex << "0x" << m_instr << dec << endl;
}
private:
sc_uint<32> m_instr;
};
#endif

109
src/C_Instruction.cpp Normal file
View File

@ -0,0 +1,109 @@
#include "C_Instruction.h"
C_Instruction::C_Instruction(sc_uint<32> instr) {
m_instr = instr;
}
op_C_Codes C_Instruction::decode() {
switch (opcode()) {
case 0b00:
switch(get_funct3()) {
case C_ADDI4SPN:
return OP_C_ADDI4SPN;
break;
case C_FLD:
return OP_C_FLD;
break;
case C_LW:
return OP_C_LW;
break;
case C_FLW:
return OP_C_FLW;
break;
case C_FSD:
return OP_C_FSD;
break;
case C_SW:
return OP_C_SW;
break;
case C_FSW:
return OP_C_FSW;
break;
default:
return OP_C_ERROR;
break;
}
break;
case 0b01:
switch(get_funct3()) {
case C_ADDI:
return OP_C_ADDI;
break;
case C_JAL:
return OP_C_JAL;
break;
case C_LI:
return OP_C_LI;
break;
case C_ADDI16SP:
return OP_C_ADDI16SP;
break;
case C_SRLI:
return OP_C_SRLI;
break;
case C_J:
return OP_C_J;
break;
case C_BEQZ:
return OP_C_BEQZ;
break;
case C_BNEZ:
return OP_C_BNEZ;
break;
default:
return OP_C_ERROR;
break;
}
break;
case 0b10:
switch(get_funct3()) {
case C_SLLI:
case C_FLDSP:
case C_LWSP:
return OP_C_LWSP;
break;
case C_FLWSP:
return OP_C_FLWSP;
break;
case C_JR:
if (m_instr.range(6,2) == 0) {
return OP_C_JR;
} else {
return OP_C_MV;
}
break;
case C_FDSP:
break;
case C_SWSP:
return OP_C_SWSP;
break;
case C_FWWSP:
default:
return OP_C_ERROR;
break;
}
break;
default:
return OP_C_ERROR;
break;
}
return OP_C_ERROR;
}