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#ifndef SYSC_PLAYGROUND_LT_BUS
#define SYSC_PLAYGROUND_LT_BUS
#include "utils/range.h"
#include "utils/sysc.h"
#include "utils/tlm_initiator_socket_tagged.h"
#include "utils/tlm_target_socket_tagged.h"
#include "utils/types.h"
#include <algorithm>
#include <memory>
#include <vector>
class lt_bus : public sc_core::sc_module {
using target_socket = tlm_target_socket_tagged<lt_bus>;
using target_socket_ptr = std::unique_ptr<target_socket>;
using initiator_socket = tlm_initiator_socket_tagged<lt_bus>;
using initiator_socket_ptr = std::unique_ptr<initiator_socket>;
public:
explicit lt_bus(sc_core::sc_module_name nm)
: sc_core::sc_module(std::move(nm)) {}
// -- ATTACH BUS INITIATOR ---------------------------------------------------
void attach_initiator(tlm::tlm_base_initiator_socket_b<>& init) {
const usize id = m_initiators.size();
const std::string name = "init" + std::to_string(id);
{
// Add current module on top of module stack for tlm sockets.
scoped_push_hierarchy h(*this);
// Add new target socket to connect BUS INITIATOR.
m_initiators.push_back(std::make_unique<target_socket>(
name.c_str(), id, this, <_bus::b_transport,
<_bus::get_direct_mem_ptr, <_bus::transport_dbg));
}
// Bind sockets.
auto& target = m_initiators.back();
target->bind(init);
}
// -- ATTACH BUS TARGET ------------------------------------------------------
void attach_target(tlm::tlm_base_target_socket_b<>& target,
u64 start,
u64 end) {
const range addr{start, end};
// Check if new range overlaps with any registered memory map range.
for (const auto& map : m_mappings) {
if (map.addr.overlaps(addr)) {
std::fprintf(stderr,
"lt_bus: memory map conflict detected\n"
"old: %08lx - %08lx\n"
"new: %08lx - %08lx\n",
map.addr.start, map.addr.end, start, end);
std::abort();
}
}
const usize id = m_targets.size();
const std::string name = "target" + std::to_string(id);
{
// Add current module on top of module stack for tlm sockets.
scoped_push_hierarchy h(*this);
// Add new initiator socket to connect BUS TARGET.
m_targets.push_back(std::make_unique<initiator_socket>(
name.c_str(), id, this, <_bus::invalidate_direct_mem_ptr));
}
// Bind sockets.
auto& init = m_targets.back();
init->bind(target);
// Insert new mapping, id is equal to idx into socket vector.
m_mappings.push_back({addr, id});
}
// -- DUMP -------------------------------------------------------------------
void dump() const {
// Dump memory map.
for (const auto& map : m_mappings) {
std::printf("%08lx - %08lx :[%2ld] %s\n", map.addr.start, map.addr.end,
map.idx, m_targets[map.idx].get()->name());
}
}
private:
// -- TLM_BW_TRANSPORT_IF ----------------------------------------------------
void invalidate_direct_mem_ptr(usize id,
sc_dt::uint64 start,
sc_dt::uint64 end) {
for (const auto& map : m_mappings) {
if (map.idx != id) {
continue;
}
const sc_dt::uint64 s = map.addr.start + start;
const sc_dt::uint64 e = map.addr.start + end;
for (auto& sock : m_initiators) {
(*sock)->invalidate_direct_mem_ptr(s, e);
}
}
}
// -- TLM_FW_TRANSPORT_IF ----------------------------------------------------
void b_transport(usize id,
tlm::tlm_generic_payload& tx,
sc_core::sc_time& t) {
u64 start = tx.get_address();
u64 end = start + tx.get_data_length() - 1;
if (auto res = decode(range{start, end})) {
assert(res.base <= start);
tx.set_address(start - res.base);
(*res.sock)->b_transport(tx, t);
tx.set_address(start);
} else {
tx.set_response_status(tlm::TLM_ADDRESS_ERROR_RESPONSE);
}
}
bool get_direct_mem_ptr(usize,
tlm::tlm_generic_payload& tx,
tlm::tlm_dmi& dmi) {
u64 start = tx.get_address();
u64 end = start + tx.get_data_length() - 1;
bool ret = false;
if (auto res = decode(range{start, end})) {
assert(res.base <= start);
tx.set_address(start - res.base);
ret = (*res.sock)->get_direct_mem_ptr(tx, dmi);
tx.set_address(start);
}
return ret;
}
unsigned int transport_dbg(usize, tlm::tlm_generic_payload& tx) {
u64 start = tx.get_address();
u64 end = start + tx.get_data_length() - 1;
unsigned int ret = 0;
if (auto res = decode(range{start, end})) {
assert(res.base <= start);
tx.set_address(start - res.base);
ret = (*res.sock)->transport_dbg(tx);
tx.set_address(start);
}
return ret;
}
// -- DECODE BUS TARGET ------------------------------------------------------
struct decode_result {
initiator_socket* sock{nullptr};
u64 base;
constexpr explicit operator bool() const {
return sock != nullptr;
}
};
decode_result decode(range addr) const {
for (const auto& map : m_mappings) {
if (map.addr.contains(addr)) {
return {m_targets[map.idx].get(), map.addr.start};
}
}
return {nullptr, 0ull};
}
// -- SC_MODULE CALLBACKS ----------------------------------------------------
virtual void start_of_simulation() override {
// Sort memory mappings by start address.
std::sort(m_mappings.begin(), m_mappings.end(),
[](const mapping& lhs, const mapping& rhs) {
return lhs.addr.start < rhs.addr.start;
});
}
// -- LOCAL CLASSES ----------------------------------------------------------
struct mapping {
range addr;
usize idx;
};
// -- MEMBER -----------------------------------------------------------------
// TARGET sockets to bind BUS INITIATORS against.
std::vector<target_socket_ptr> m_initiators;
// INITIATOR sockets to bind BUS TARGET against.
std::vector<initiator_socket_ptr> m_targets;
// Address range mappings to BUS TARGETs (m_tragets).
std::vector<mapping> m_mappings;
};
#endif
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