Initial commit

* Bare skeleton implementation of everything
* Testbench builds with Verilator
* Test runs

tb/tb_env.sv

@@ -0,0 +1,40 @@
+// Testbench environment for UVM-based verification
+class tb_env extends uvm_env;
+
+    axi_agent axi_m;
+    axi_agent axi_s;
+
+    `uvm_component_utils(tb_env)
+
+    // ------------------------------------------------------------
+    function new(string name, uvm_component parent);
+        super.new(name, parent);
+    endfunction
+
+    // ------------------------------------------------------------
+    virtual function void build_phase(uvm_phase phase);
+        axi_m = axi_agent::type_id::create("axi_m", this);
+        axi_s = axi_agent::type_id::create("axi_s", this);
+
+        `uvm_info("tb_env", $sformatf("Building testbench environment: %s", get_full_name()), UVM_LOW)
+        // Set agent types in AXI agents
+        axi_m.set_agent_type(MANAGER);
+        axi_s.set_agent_type(SUBORDINATE);
+    endfunction
+
+    // ------------------------------------------------------------
+    virtual function void connect_phase(uvm_phase phase);
+        `uvm_info("tb_env", $sformatf("Connecting testbench environment: %s", get_full_name()), UVM_LOW)
+    endfunction
+
+    // ------------------------------------------------------------
+    virtual function void report_phase(uvm_phase phase);
+        `uvm_info("tb_env", $sformatf("Reporting for testbench environment: %s", get_full_name()), UVM_LOW)
+        // Add any specific report phase tasks here
+    endfunction
+
+    // ------------------------------------------------------------
+    function uvm_sequencer_base get_axi_m_sequencer();
+        return axi_m.sequencer;
+    endfunction
+endclass : tb_env