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Expand rvcpp counter CSR implementation

This commit is contained in:
Luke Wren 2024-03-19 08:44:24 +00:00
parent af08c0becd
commit 32f65fb142
2 changed files with 75 additions and 32 deletions
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57
test/sim/rvcpp/rv.cpp
View File

@ -5,6 +5,7 @@
#include <fstream>
#include <optional>
#include <tuple>
#include <array>
#include <vector>
#include "rv_opcodes.h"
@ -145,6 +146,10 @@ class RVCSR {
uint priv;
ux_t mcycle;
ux_t mcycleh;
ux_t minstret;
ux_t minstreth;
ux_t mcountinhibit;
ux_t mstatus;
ux_t mie;
ux_t mip;
@ -153,6 +158,8 @@ class RVCSR {
ux_t mepc;
ux_t mcause;
std::optional<ux_t> addr_written_this_step;
public:
enum {
@ -164,6 +171,10 @@ public:
RVCSR() {
priv = 3;
mcycle = 0;
mcycleh = 0;
minstret = 0;
minstreth = 0;
mcountinhibit = 0;
mstatus = 0;
mie = 0;
mip = 0;
@ -171,9 +182,32 @@ public:
mscratch = 0;
mepc = 0;
mcause = 0;
addr_written_this_step = {};
}
void step() {++mcycle;}
void step() {
uint64_t mcycle_64 = ((uint64_t)mcycleh << 32) | mcycle;
uint64_t minstret_64 = ((uint64_t)minstreth << 32) | minstret;
if (!(mcountinhibit & 0x1u)) {
++mcycle_64;
}
if (!(mcountinhibit & 0x4u)) {
++minstret_64;
}
if (!(addr_written_this_step && *addr_written_this_step == CSR_MCYCLEH)) {
mcycleh = mcycle_64 >> 32;
}
if (!(addr_written_this_step && *addr_written_this_step == CSR_MCYCLE)) {
mcycle = mcycle_64 & 0xffffffffu;
}
if (!(addr_written_this_step && *addr_written_this_step == CSR_MINSTRETH)) {
minstreth = minstret_64 >> 32;
}
if (!(addr_written_this_step && *addr_written_this_step == CSR_MINSTRET)) {
minstret = minstret_64 & 0xffffffffu;
}
addr_written_this_step = {};
}
// Returns None on permission/decode fail
std::optional<ux_t> read(uint16_t addr, bool side_effect=true) {
@ -181,11 +215,12 @@ public:
return {};
switch (addr) {
case CSR_MISA: return 0x40101105; // RV32IMAC + U
case CSR_MISA: return 0x40901105; // RV32IMACX + U
case CSR_MHARTID: return 0;
case CSR_MARCHID: return 0;
case CSR_MIMPID: return 0;
case CSR_MVENDORID: return 0;
case CSR_MARCHID: return 0x1b; // Hazard3
case CSR_MIMPID: return 0x12345678u; // Match testbench value
case CSR_MVENDORID: return 0xdeadbeefu; // Match testbench value
case CSR_MCONFIGPTR: return 0x9abcdef0u; // Match testbench value
case CSR_MSTATUS: return mstatus;
case CSR_MIE: return mie;
@ -196,8 +231,11 @@ public:
case CSR_MCAUSE: return mcause;
case CSR_MTVAL: return 0;
case CSR_MCOUNTINHIBIT: return mcountinhibit;
case CSR_MCYCLE: return mcycle;
case CSR_MINSTRET: return mcycle;
case CSR_MCYCLEH: return mcycleh;
case CSR_MINSTRET: return minstret;
case CSR_MINSTRETH: return minstreth;
default: return {};
}
@ -205,6 +243,7 @@ public:
// Returns false on permission/decode fail
bool write(uint16_t addr, ux_t data, uint op=WRITE) {
addr_written_this_step = addr;
if (addr >= 1u << 12 || GETBITS(addr, 9, 8) > priv)
return false;
if (addr >= 1u << 12)
@ -234,8 +273,10 @@ public:
case CSR_MTVAL: break;
case CSR_MCYCLE: mcycle = data; break;
case CSR_MINSTRET: mcycle = data; break;
case CSR_MCYCLEH: mcycleh = data; break;
case CSR_MINSTRET: minstret = data; break;
case CSR_MINSTRETH: minstreth = data; break;
case CSR_MCOUNTINHIBIT: mcountinhibit = data & 0x7u; break;
default: return false;
}
return true;

2
test/sim/rvcpp/rv_csr.h
View File

@ -324,6 +324,7 @@
#define CSR_MHPMCOUNTER29 0xb1d
#define CSR_MHPMCOUNTER30 0xb1e
#define CSR_MHPMCOUNTER31 0xb1f
#define CSR_MCOUNTINHIBIT 0x320
#define CSR_MHPMEVENT3 0x323
#define CSR_MHPMEVENT4 0x324
#define CSR_MHPMEVENT5 0x325
@ -357,6 +358,7 @@
#define CSR_MARCHID 0xf12
#define CSR_MIMPID 0xf13
#define CSR_MHARTID 0xf14
#define CSR_MCONFIGPTR 0xf15
#define CSR_CYCLEH 0xc80
#define CSR_TIMEH 0xc81
#define CSR_INSTRETH 0xc82