systemc: define control extension

There are some flags in gem5 Packet class to specifying the control
signals, like priv bit, secure bit, etc. For now we don't have the
corresponding way to bridge the information in gem5 and SystemC. The
control extension would be responsible for control signals.

Change-Id: I35ba8610210e0750917a78fa0adb321991968f6a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59649
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Gabe Black <gabe.black@gmail.com>

src/systemc/tlm_bridge/sc_ext.cc

@@ -125,4 +125,85 @@ AtomicExtension::getAtomicOpFunctor() const
     return _op.get();
 }
 
+ControlExtension::ControlExtension()
+    : privileged(false), secure(false), instruction(false), qos(0)
+{
+}
+
+tlm::tlm_extension_base *
+ControlExtension::clone() const
+{
+    return new ControlExtension(*this);
+}
+
+void
+ControlExtension::copy_from(const tlm::tlm_extension_base &ext)
+{
+    const ControlExtension &from = static_cast<const ControlExtension &>(ext);
+    *this = from;
+}
+
+ControlExtension &
+ControlExtension::getExtension(const tlm::tlm_generic_payload &payload)
+{
+    return ControlExtension::getExtension(&payload);
+}
+
+ControlExtension &
+ControlExtension::getExtension(const tlm::tlm_generic_payload *payload)
+{
+    ControlExtension *result = nullptr;
+    payload->get_extension(result);
+    sc_assert(result);
+    return *result;
+}
+
+bool
+ControlExtension::isPrivileged() const
+{
+    return privileged;
+}
+
+void
+ControlExtension::setPrivileged(bool p)
+{
+    privileged = p;
+}
+
+bool
+ControlExtension::isSecure() const
+{
+    return secure;
+}
+
+void
+ControlExtension::setSecure(bool s)
+{
+    secure = s;
+}
+
+bool
+ControlExtension::isInstruction() const
+{
+    return instruction;
+}
+
+void
+ControlExtension::setInstruction(bool i)
+{
+    instruction = i;
+}
+
+uint8_t
+ControlExtension::getQos() const
+{
+    return qos;
+}
+
+void
+ControlExtension::setQos(uint8_t q)
+{
+    qos = q;
+}
+
 } // namespace Gem5SystemC

src/systemc/tlm_bridge/sc_ext.hh

@@ -34,6 +34,7 @@
 #ifndef __SYSTEMC_TLM_BRIDGE_SC_EXT_HH__
 #define __SYSTEMC_TLM_BRIDGE_SC_EXT_HH__
 
+#include <cstdint>
 #include <memory>
 
 #include "base/amo.hh"
@@ -83,6 +84,41 @@ class AtomicExtension: public tlm::tlm_extension<AtomicExtension>
     bool _needReturn;
 };
 
+class ControlExtension : public tlm::tlm_extension<ControlExtension>
+{
+  public:
+    ControlExtension();
+
+    tlm_extension_base *clone() const override;
+    void copy_from(const tlm_extension_base &ext) override;
+
+    static ControlExtension &getExtension(
+            const tlm::tlm_generic_payload *payload);
+    static ControlExtension &getExtension(
+            const tlm::tlm_generic_payload &payload);
+
+    /* Secure and privileged access */
+    bool isPrivileged() const;
+    void setPrivileged(bool p);
+    bool isSecure() const;
+    void setSecure(bool s);
+    bool isInstruction() const;
+    void setInstruction(bool i);
+
+    /* Quality of Service (AXI4) */
+    uint8_t getQos() const;
+    void setQos(uint8_t q);
+
+  private:
+    /* Secure and privileged access */
+    bool privileged;
+    bool secure;
+    bool instruction;
+
+    /* Quality of Service (AXI4) */
+    uint8_t qos;
+};
+
 } // namespace Gem5SystemC
 
 #endif // __SYSTEMC_TLM_BRIDGE_SC_EXT_HH__