fixes mcycle to increase while core is in WFI (in SystemC)

Author: eyck

CMakeLists.txt

@@ -44,7 +44,7 @@ if(NOT TARGET dbt-rise-core)
     FetchContent_Declare(
         dbt_rise_core_git
         GIT_REPOSITORY "https://github.com/Minres/DBT-RISE-Core.git"
-        GIT_TAG 7cd010c
+        GIT_TAG 29e97c02
         GIT_SHALLOW OFF
         UPDATE_DISCONNECTED NOT ${UPDATE_EXTERNAL_PROJECT} # When enabled, this option causes the update step to be skipped.
     )

src/sysc/core2sc_adapter.h

@@ -47,6 +47,7 @@
 #include <scc/async_event.h>
 #include <scc/report.h>
 #include <shared_mutex>
+#include <sysc/kernel/sc_simcontext.h>
 #include <sysc/kernel/sc_time.h>
 #include <util/instance_logger.h>
 #include <util/ities.h>
@@ -262,13 +263,19 @@ template <typename PLAT> class core2sc_adapter : public PLAT, public sc2core_if
         SCCDEBUG(owner->hier_name()) << "Sleeping until interrupt";
         wfi_inst.store(true, std::memory_order_relaxed);
         std::function<void(void)> f = [this]() {
+            auto start = sc_core::sc_time_stamp();
             while((this->mip_csr & this->mie_csr) == 0) {
                 sc_core::wait(this->wfi_evt | this->debugger_stop_evt);
                 bool is_debugger_stop_evt = this->debugger_stop_evt.triggered();
                 if(is_debugger_stop_evt)
                     break;
             }
             SCCINFO(this->owner->hier_name()) << "Got WFI event";
+            auto duration = sc_core::sc_time_stamp() - start;
+            if(clk_if && duration > sc_core::SC_ZERO_TIME) {
+                auto cycles = duration.value() / clk_if->read().value();
+                this->reg.cycle += cycles;
+            }
         };
         owner->exec_on_sysc(f);
         wfi_inst.store(false, std::memory_order_relaxed);

src/sysc/core_complex.cpp

@@ -170,6 +170,7 @@ void core_complex<BUSWIDTH, QK>::create_cpu(std::string const& type, std::string
             SCCFATAL() << "Could not create vm for isa " << type << " and backend " << backend;
     } else {
         core->set_hartid(hart_id);
+        core->set_clk_if(clk_i.get_interface(0));
         core->set_clint_irq_count(clint_irq_i.size());
         auto* srv = debugger::server<debugger::gdb_session>::get();
         if(srv)

src/sysc/sc2core_if.h

@@ -66,6 +66,10 @@ struct sc2core_if {
     util::delegate<void(unsigned, wr_csr_f)> register_csr_wr;
     virtual void register_unknown_instr_handler(util::delegate<iss::arch_if::unknown_instr_cb_t>) = 0;
     virtual void set_clint_irq_count(size_t) = 0;
+    void set_clk_if(sc_core::sc_signal_in_if<sc_core::sc_time>* clk_if) { this->clk_if = clk_if; };
+
+protected:
+    sc_core::sc_signal_in_if<sc_core::sc_time>* clk_if{nullptr};
 };
 } // namespace sysc
 #endif /* _SYSC_SC2CORE_IF_H_ */