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rocket-chip/csrc/mm.cc

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2014-09-12 19:15:04 +02:00
// See LICENSE for license details.
#include "mm.h"
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <cassert>
void mm_t::write(uint64_t addr, uint8_t *data, uint64_t strb, uint64_t size)
{
strb &= ((1 << size) - 1) << (addr % word_size);
addr %= this->size;
uint8_t *base = this->data + (addr / word_size) * word_size;
for (int i = 0; i < word_size; i++) {
if (strb & 1)
base[i] = data[i];
strb >>= 1;
}
}
std::vector<char> mm_t::read(uint64_t addr)
{
addr %= this->size;
uint8_t *base = this->data + addr;
return std::vector<char>(base, base + word_size);
}
void mm_t::init(size_t sz, int wsz, int lsz)
{
assert(wsz > 0 && lsz > 0 && (lsz & (lsz-1)) == 0 && lsz % wsz == 0);
word_size = wsz;
line_size = lsz;
data = new uint8_t[sz];
size = sz;
}
mm_t::~mm_t()
{
delete [] data;
}
void mm_magic_t::init(size_t sz, int wsz, int lsz)
{
mm_t::init(sz, wsz, lsz);
dummy_data.resize(word_size);
}
void mm_magic_t::tick(
bool ar_valid,
uint64_t ar_addr,
uint64_t ar_id,
uint64_t ar_size,
uint64_t ar_len,
bool aw_valid,
uint64_t aw_addr,
uint64_t aw_id,
uint64_t aw_size,
uint64_t aw_len,
bool w_valid,
uint64_t w_strb,
void *w_data,
bool w_last,
bool r_ready,
bool b_ready)
{
bool ar_fire = ar_valid && ar_ready();
bool aw_fire = aw_valid && aw_ready();
bool w_fire = w_valid && w_ready();
bool r_fire = r_valid() && r_ready;
bool b_fire = b_valid() && b_ready;
if (ar_fire) {
uint64_t start_addr = (ar_addr / word_size) * word_size;
for (int i = 0; i <= ar_len; i++) {
auto dat = read(start_addr + i * word_size);
rresp.push(mm_rresp_t(ar_id, dat, i == ar_len));
}
}
if (aw_fire) {
store_addr = aw_addr;
store_id = aw_id;
store_count = aw_len + 1;
store_size = 1 << aw_size;
store_inflight = true;
}
if (w_fire) {
write(store_addr, (uint8_t *) w_data, w_strb, store_size);
store_addr += store_size;
store_count--;
if (store_count == 0) {
store_inflight = false;
bresp.push(store_id);
assert(w_last);
}
}
if (b_fire)
bresp.pop();
if (r_fire)
rresp.pop();
cycle++;
}
void load_mem(void** mems, const char* fn, int line_size, int nchannels)
{
char* m;
ssize_t start = 0;
std::ifstream in(fn);
if (!in)
{
std::cerr << "could not open " << fn << std::endl;
exit(-1);
}
std::string line;
while (std::getline(in, line))
{
#define parse_nibble(c) ((c) >= 'a' ? (c)-'a'+10 : (c)-'0')
for (ssize_t i = line.length()-2, j = 0; i >= 0; i -= 2, j++) {
char data = (parse_nibble(line[i]) << 4) | parse_nibble(line[i+1]);
ssize_t addr = start + j;
int channel = (addr / line_size) % nchannels;
m = (char *) mems[channel];
addr = (addr / line_size / nchannels) * line_size + (addr % line_size);
m[addr] = data;
}
start += line.length()/2;
}
}