add new unittest: test_issuer_mmu_data_path.py

diff --git a/src/soc/fu/mmu/test/test_issuer_mmu_data_path.py b/src/soc/fu/mmu/test/test_issuer_mmu_data_path.py
new file mode 100644 (file)
index 0000000..60011e3
--- /dev/null
+++ b/src/soc/fu/mmu/test/test_issuer_mmu_data_path.py
@@ -0,0 +1,34 @@
+from nmigen import Module, Signal
+from soc.simple.test.test_issuer import TestRunner
+from soc.simulator.program import Program
+from soc.config.endian import bigendian
+import unittest
+
+from soc.fu.test.common import (
+    TestAccumulatorBase, skip_case, TestCase, ALUHelpers)
+
+# this test case takes about half a minute to run on my Talos II
+class MMUDataPathTestCase(TestAccumulatorBase):
+    # MMU handles MTSPR, MFSPR, DCBZ and TLBIE.
+    # other instructions here -> must be load/store
+
+    def case_mfspr_after_invalid_load(self):
+        lst = [ 
+                "tlbie 0,0,0,0,0"    # RB,RS,RIC,PRS,R
+              ]
+
+        initial_regs = [0] * 32
+
+        #FIXME initial_sprs = {'DSISR': 0x12345678, 'DAR': 0x87654321}
+        initial_sprs = {}
+        self.add_case(Program(lst, bigendian),
+                      initial_regs, initial_sprs)
+
+
+if __name__ == "__main__":
+    unittest.main(exit=False)
+    suite = unittest.TestSuite()
+    suite.addTest(TestRunner(MMUDataPathTestCase().test_data))
+
+    runner = unittest.TextTestRunner()
+    runner.run(suite)