[dv, cosim] Refactor co-sim DPI to use an unified 'mpact_get_register' API

Bug: 443772447

Change-Id: I6813f5beb7a2dba968c717a0d7d5567c7a10fd76

tests/uvm/common/cosim/kelvin_cosim_checker_pkg.sv

diff --git a/tests/uvm/common/cosim/kelvin_cosim_checker_pkg.sv b/tests/uvm/common/cosim/kelvin_cosim_checker_pkg.sv
index 517d342..12e0041 100644
--- a/tests/uvm/common/cosim/kelvin_cosim_checker_pkg.sv
+++ b/tests/uvm/common/cosim/kelvin_cosim_checker_pkg.sv
@@ -121,7 +121,9 @@
           bit pc_match_found = 0;
           int match_index = -1;
 
-          mpact_pc = mpact_get_pc();
+          if (mpact_get_register("pc", mpact_pc) != 0) begin
+            `uvm_error("COSIM_API_FAIL", "Failed to get PC from MPACT simulator.")
+          end
 
           foreach (retired_instr_q[j]) begin
             if (retired_instr_q[j].pc == mpact_pc) begin
@@ -171,6 +173,7 @@
       int unsigned mpact_gpr_val;
       int unsigned rd_index;
       logic [31:0] rtl_wdata;
+      string reg_name;
 
       `uvm_info(get_type_name(), "Comparing GPR writeback state...", UVM_HIGH)
 
@@ -188,7 +191,10 @@
       end
       else if (rtl_info.x_wb != 0) begin
         rd_index = $clog2(rtl_info.x_wb);
-        mpact_gpr_val = mpact_get_gpr(rd_index);
+        reg_name = $sformatf("x%0d", rd_index);
+        if (mpact_get_register(reg_name, mpact_gpr_val) != 0) begin
+          `uvm_error("COSIM_API_FAIL", $sformatf("Failed to get GPR '%s'", reg_name))
+        end
 
         // Get the specific write data from the correct retire channel and register index
         rtl_wdata = rvvi_vif.x_wdata[0][rtl_info.retire_index][rd_index];

tests/uvm/common/cosim/kelvin_cosim_dpi_if.sv

diff --git a/tests/uvm/common/cosim/kelvin_cosim_dpi_if.sv b/tests/uvm/common/cosim/kelvin_cosim_dpi_if.sv
index 5e6d216..66f7ffc 100644
--- a/tests/uvm/common/cosim/kelvin_cosim_dpi_if.sv
+++ b/tests/uvm/common/cosim/kelvin_cosim_dpi_if.sv
@@ -41,17 +41,11 @@
   // Returns '1' (true) if halted.
   import "DPI-C" context function bit mpact_is_halted();
 
-  // Function to get the program counter.
-  import "DPI-C" context function int unsigned mpact_get_pc();
-
-  // Function to get a general-purpose register value.
-  import "DPI-C" context function int unsigned mpact_get_gpr(
-    input int unsigned index
-  );
-
-  // Function to get a control and status register value.
-  import "DPI-C" context function int unsigned mpact_get_csr(
-    input int unsigned address
+  // Function to get a register value (GPR, PC, CSR) by its string name.
+  // The C pointer 'uint32_t* value' maps to an 'output' argument in SV.
+  import "DPI-C" context function int mpact_get_register(
+    input string name,
+    output int unsigned value
   );
 
   // Function to finalize the MPACT simulator.