96 lines
2.0 KiB
C++
96 lines
2.0 KiB
C++
#include "mm.h"
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#include <iostream>
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#include <fstream>
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#include <cstdlib>
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#include <cstring>
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#include <cassert>
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void mm_t::init(size_t sz, int wsz, int lsz)
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{
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assert(wsz > 0 && lsz > 0 && (lsz & (lsz-1)) == 0 && lsz % wsz == 0);
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word_size = wsz;
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line_size = lsz;
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data = new char[sz];
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size = sz;
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}
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mm_t::~mm_t()
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{
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delete [] data;
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}
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void mm_magic_t::init(size_t sz, int wsz, int lsz)
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{
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mm_t::init(sz, wsz, lsz);
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dummy_data.resize(word_size);
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}
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void mm_magic_t::tick
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(
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bool req_cmd_val,
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bool req_cmd_store,
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uint64_t req_cmd_addr,
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uint64_t req_cmd_tag,
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bool req_data_val,
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void* req_data_bits,
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bool resp_rdy
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)
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{
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bool req_cmd_fire = req_cmd_val && req_cmd_ready();
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bool req_data_fire = req_data_val && req_data_ready();
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bool resp_fire = resp_valid() && resp_rdy;
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assert(!(req_cmd_fire && req_data_fire));
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if (resp_fire)
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resp.pop();
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if (req_data_fire)
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{
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memcpy(data + store_addr + store_count*word_size, req_data_bits, word_size);
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store_count = (store_count + 1) % (line_size/word_size);
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if (store_count == 0)
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store_inflight = false;
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}
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if (req_cmd_fire)
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{
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auto byte_addr = req_cmd_addr * line_size;
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assert(byte_addr < size);
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if (req_cmd_store)
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{
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store_inflight = true;
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store_addr = byte_addr;
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}
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else for (int i = 0; i < line_size/word_size; i++)
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{
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auto base = data + byte_addr + i*word_size;
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auto dat = std::vector<char>(base, base + word_size);
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resp.push(std::make_pair(req_cmd_tag, dat));
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}
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}
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cycle++;
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}
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void load_mem(void* mem, const char* fn)
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{
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char* m = (char*)mem;
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std::ifstream in(fn);
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if (!in)
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{
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std::cerr << "could not open " << fn << std::endl;
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exit(-1);
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}
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std::string line;
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while (std::getline(in, line))
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{
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#define parse_nibble(c) ((c) >= 'a' ? (c)-'a'+10 : (c)-'0')
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for (ssize_t i = line.length()-2, j = 0; i >= 0; i -= 2, j++)
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m[j] = (parse_nibble(line[i]) << 4) | parse_nibble(line[i+1]);
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m += line.length()/2;
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}
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}
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