upsilon/firmware/rtl/autoapproach/bram_interface_sim.cpp

119 lines
2.6 KiB
C++

#include <memory>
#include <cassert>
#include <limits>
#include <cstdint>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <random>
#include <unistd.h>
#include <verilated.h>
#include "Vbram_interface.h"
using ModType = Vbram_interface;
using V = uint32_t;
ModType *mod;
constexpr uint32_t start_addr = 0x12340;
// #define BAILOUT_NUMBER 100000
#include "../boilerplate.cpp"
std::array<uint32_t, WORD_AMNT> ram_refresh_data;
static void handle_ram() {
static int timer = 0;
constexpr auto TIMER_MAX = 10;
bool flip_flop = false;
if (mod->ram_read) {
timer++;
if (timer == TIMER_MAX) {
mod->ram_valid = 1;
if (mod->ram_dma_addr < start_addr ||
mod->ram_dma_addr >= start_addr + WORD_AMNT*4) {
printf("bad address %x\n", mod->ram_dma_addr);
exit(1);
}
my_assert(mod->ram_dma_addr >= start_addr, "left oob access %x", mod->ram_dma_addr);
my_assert(mod->ram_dma_addr < start_addr + WORD_AMNT*4, "right oob access %x", mod->ram_dma_addr);
my_assert(mod->ram_dma_addr % 2 == 0, "unaligned access %x", mod->ram_dma_addr);
if (mod->ram_dma_addr % 4 == 0) {
mod->ram_word = ram_refresh_data[(mod->ram_dma_addr - start_addr)/4]& 0xFFFF;
} else {
mod->ram_word = ram_refresh_data[(mod->ram_dma_addr - start_addr)/4] >> 16;
}
}
} else {
mod->ram_valid = 0;
timer = 0;
}
}
static void handle_read_aa(size_t &i) {
if (mod->word_ok) {
uint32_t val = sign_extend(mod->word, 20);
mod->word_next = 0;
my_assert(val == ram_refresh_data[i], "received value %x (%zu) != %x", i, val, ram_refresh_data[i]);
i++;
} else if (!mod->word_next) {
mod->word_next = 1;
}
}
/* Test reading the entire array twice. */
static void test_aa_read_1() {
size_t ind = 0;
mod->word_next = 1;
run_clock();
while (!mod->word_last || (mod->word_last && mod->word_next)) {
handle_read_aa(ind);
run_clock();
}
my_assert(ind == WORD_AMNT, "read value %zu != %d\n", ind, WORD_AMNT);
mod->word_next = 1;
run_clock();
ind = 0;
while (!mod->word_last || (mod->word_last && mod->word_next)) {
handle_read_aa(ind);
run_clock();
}
my_assert(ind == WORD_AMNT, "second read value %zu != %d\n", ind, WORD_AMNT);
}
static void refresh_data() {
for (size_t i = 0; i < RAM_WID; i++) {
ram_refresh_data[i] = mask_extend(rand(), 20);
}
mod->refresh_start = 1;
mod->start_addr = start_addr;
run_clock();
while (!mod->refresh_finished) {
handle_ram();
run_clock();
}
mod->refresh_start = 0;
run_clock();
}
int main(int argc, char **argv) {
init(argc, argv);
refresh_data();
test_aa_read_1();
refresh_data();
test_aa_read_1();
printf("ok\n");
return 0;
}