systemc: Implement the nonstandard at_negedge and at_posedge.

Change-Id: I7ea5cfd309db4b9883df551fd7dcec186e4f38a3
Reviewed-on: https://gem5-review.googlesource.com/c/12467
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

diff --git a/src/systemc/core/sc_module.cc b/src/systemc/core/sc_module.cc
index 6be3818dab5fae3746050c65a70cb22d5f49bb74..8418a3136ca4e79ac0e014281a5057b234888e03 100644 (file)
--- a/src/systemc/core/sc_module.cc
+++ b/src/systemc/core/sc_module.cc
@@ -35,8 +35,10 @@
 #include "systemc/core/kernel.hh"
 #include "systemc/core/module.hh"
 #include "systemc/core/process_types.hh"
+#include "systemc/ext/channel/sc_signal_in_if.hh"
 #include "systemc/ext/core/sc_module.hh"
 #include "systemc/ext/core/sc_module_name.hh"
+#include "systemc/ext/dt/bit/sc_logic.hh"
 #include "systemc/ext/utils/sc_report_handler.hh"
 
 namespace sc_gem5
@@ -672,27 +674,39 @@ halt()
 }
 
 void
-at_posedge(const sc_signal_in_if<bool> &)
+at_posedge(const sc_signal_in_if<bool> &s)
 {
-    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    while (s.read())
+        wait();
+    while (!s.read())
+        wait();
 }
 
 void
-at_posedge(const sc_signal_in_if<sc_dt::sc_logic> &)
+at_posedge(const sc_signal_in_if<sc_dt::sc_logic> &s)
 {
-    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    while (s.read() == sc_dt::Log_1)
+        wait();
+    while (s.read() == sc_dt::Log_0)
+        wait();
 }
 
 void
-at_negedge(const sc_signal_in_if<bool> &)
+at_negedge(const sc_signal_in_if<bool> &s)
 {
-    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    while (!s.read())
+        wait();
+    while (s.read())
+        wait();
 }
 
 void
-at_negedge(const sc_signal_in_if<sc_dt::sc_logic> &)
+at_negedge(const sc_signal_in_if<sc_dt::sc_logic> &s)
 {
-    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    while (s.read() == sc_dt::Log_0)
+        wait();
+    while (s.read() == sc_dt::Log_1)
+        wait();
 }
 
 const char *