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better MISA CSR register support

This commit is contained in:
mariusmonton 2018-12-12 18:15:44 +01:00
parent 93fe2237b4
commit 5c905cb5ca
2 changed files with 21 additions and 7 deletions
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16
inc/Registers.h
View File

@ -16,10 +16,12 @@
#include "Performance.h"
#include "Memory.h"
#define WARL_M_EXTENSION (1 << 12)
#define WARL_C_EXTENSION (1 << 2)
#define WARL_I_BASE (1 << 8)
#define WARL_MXL (1 << 30)
#define MISA_A_EXTENSION (1 << 0)
#define MISA_B_EXTENSION (1 << 1)
#define MISA_C_EXTENSION (1 << 2)
#define MISA_I_BASE (1 << 8)
#define MISA_M_EXTENSION (1 << 12)
#define MISA_MXL (1 << 30)
#define CSR_MVENDORID (0xF11)
@ -41,6 +43,12 @@
#define CSR_MTVAL (0x343)
#define CSR_MIP (0x344)
#define CSR_SSCRATCH (0x140)
#define CSR_SEPC (0x141)
#define CSR_SCAUSE (0x142)
#define CSR_STVAL (0x143)
#define CSR_SIP (0x144)
#define CSR_CYCLE (0xC00)
#define CSR_TIME (0xC01)
#define CSR_INSTRET (0xC02)

10
src/Registers.cpp
View File

@ -9,7 +9,7 @@ Registers::Registers() {
initCSR();
//register_bank[sp] = 1024-1; // SP points to end of memory
register_bank[sp] = Memory::SIZE-4;
register_PC = 0x10000; // default _start address
register_PC = 0x80000000; // default _start address
}
void Registers::dump(void) {
@ -113,10 +113,16 @@ uint32_t Registers::getCSR(int csr) {
void Registers::setCSR(int csr, uint32_t value) {
/* @note rv32mi-p-ma_fetch tests doesn't allow MISA to writable,
* but Volume II: Privileged Architectura v1.10 says MISRA is writable (?)
*/
if (csr != CSR_MISA) {
CSR[csr] = value;
}
}
void Registers::initCSR() {
CSR[CSR_MISA] = WARL_MXL | WARL_M_EXTENSION | WARL_C_EXTENSION | WARL_I_BASE;
CSR[CSR_MISA] = MISA_MXL | MISA_M_EXTENSION | MISA_C_EXTENSION
| MISA_A_EXTENSION | MISA_I_BASE;
}