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risc-v-tlm
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enhanced IRQ support

This commit is contained in:
mariusmonton 2019-02-11 15:54:02 +01:00
parent 2c2cf3000b
commit 2c93492ab1
2 changed files with 27 additions and 9 deletions
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24
src/CPU.cpp
View File

@ -11,12 +11,12 @@ CPU::CPU(sc_module_name name, uint32_t PC): sc_module(name)
register_bank->setPC(PC); register_bank->setPC(PC);
register_bank->setValue(Registers::sp, (0xD0000 / 4) - 1); //register_bank->setValue(Registers::sp, (0xD0000 / 4) - 1);
//register_bank->setValue(Registers::sp, (0x10000000 / 4) - 1); register_bank->setValue(Registers::sp, (0x10000000 / 4) - 1);
irq_line_socket.register_b_transport(this, &CPU::call_interrupt); irq_line_socket.register_b_transport(this, &CPU::call_interrupt);
interrupt = false; interrupt = false;
SC_THREAD(CPU_thread); SC_THREAD(CPU_thread);
} }
@ -33,11 +33,18 @@ bool CPU::cpu_process_IRQ() {
uint32_t new_pc, old_pc; uint32_t new_pc, old_pc;
bool ret_value = false; bool ret_value = false;
if (interrupt == true){ if (interrupt == true) {
csr_temp = register_bank->getCSR(CSR_MSTATUS);
if (csr_temp & MSTATUS_MIE) {
} else {
log->SC_log(Log::DEBUG) << "interrupt delayed" << endl;
return ret_value;
}
csr_temp = register_bank->getCSR(CSR_MIP); csr_temp = register_bank->getCSR(CSR_MIP);
if ( (csr_temp & (1 << 11) ) == 0 ) { if ( (csr_temp & MIP_MEIP ) == 0 ) {
csr_temp |= (1 << 11); // MEIP bit in MIP register (11th bit) csr_temp |= MIP_MEIP; // MEIP bit in MIP register (11th bit)
register_bank->setCSR(CSR_MIP, csr_temp); register_bank->setCSR(CSR_MIP, csr_temp);
// cout << "time: " << sc_time_stamp() << ". CPU: interrupt" << endl; // cout << "time: " << sc_time_stamp() << ". CPU: interrupt" << endl;
log->SC_log(Log::DEBUG) << "Interrupt!" << endl; log->SC_log(Log::DEBUG) << "Interrupt!" << endl;
@ -48,7 +55,7 @@ bool CPU::cpu_process_IRQ() {
log->SC_log(Log::INFO) << "Old PC Value 0x" << hex << old_pc << endl; log->SC_log(Log::INFO) << "Old PC Value 0x" << hex << old_pc << endl;
/* update MCAUSE register */ /* update MCAUSE register */
register_bank->setCSR(CSR_MCAUSE, 0x8000000); register_bank->setCSR(CSR_MCAUSE, 0x80000000);
/* set new PC address */ /* set new PC address */
new_pc = register_bank->getCSR(CSR_MTVEC); new_pc = register_bank->getCSR(CSR_MTVEC);
@ -61,7 +68,7 @@ bool CPU::cpu_process_IRQ() {
} }
} else { } else {
csr_temp = register_bank->getCSR(CSR_MIP); csr_temp = register_bank->getCSR(CSR_MIP);
csr_temp &= ~(1 << 11); csr_temp &= ~MIP_MEIP;
register_bank->setCSR(CSR_MIP, csr_temp); register_bank->setCSR(CSR_MIP, csr_temp);
} }
@ -509,6 +516,7 @@ void CPU::CPU_thread(void) {
} // while(1) } // while(1)
} // CPU_thread } // CPU_thread
void CPU::call_interrupt(tlm::tlm_generic_payload &trans, sc_time &delay) { void CPU::call_interrupt(tlm::tlm_generic_payload &trans, sc_time &delay) {
interrupt = true; interrupt = true;
} }

12
src/Execute.cpp
View File

@ -1029,7 +1029,8 @@ bool Execute::CSRRSI(Instruction &inst) {
log->SC_log(Log::INFO) << "CSRRSI: CSR #" log->SC_log(Log::INFO) << "CSRRSI: CSR #"
<< csr << " -> x" << rd << csr << " -> x" << rd
<< ". x" << rs1 << " & CSR #" << csr << endl; << ". x" << rs1 << " & CSR #" << csr
<< "(0x" << hex << aux << ")"<< endl;
return true; return true;
} }
@ -1073,6 +1074,15 @@ bool Execute::MRET(Instruction &inst) {
log->SC_log(Log::INFO) << "MRET: PC <- 0x" << hex << new_pc << endl; log->SC_log(Log::INFO) << "MRET: PC <- 0x" << hex << new_pc << endl;
// update mstatus
uint32_t csr_temp;
csr_temp = regs->getCSR(CSR_MSTATUS);
if (csr_temp & MSTATUS_MPIE) {
csr_temp |= MSTATUS_MIE;
}
csr_temp |= MSTATUS_MPIE;
regs->setCSR(CSR_MSTATUS, csr_temp);
return true; return true;
} }