Add driver test cases for PersistentDataAccessor. (#747)

PersistentData::assert_matches_layout() is executed on the host as part
of the unit tests, but we also need to check the layout when compiled for
risc-v, as some types have a different size on a 32-bit CPU.

drivers/test-fw/Cargo.toml

@@ -81,6 +81,11 @@ name = "pcrbank"
 path = "src/bin/pcrbank_tests.rs"
 required-features = ["riscv"]
 
+[[bin]]
+name = "persistent"
+path = "src/bin/persistent_tests.rs"
+required-features = ["riscv"]
+
 [[bin]]
 name = "sha384acc"
 path = "src/bin/sha384acc_tests.rs"

drivers/test-fw/src/bin/persistent_tests.rs

@@ -0,0 +1,27 @@
+// Licensed under the Apache-2.0 license
+
+#![no_std]
+#![no_main]
+
+use caliptra_drivers::{PersistentData, PersistentDataAccessor};
+use caliptra_test_harness::test_suite;
+
+fn test_persistent_data_layout() {
+    PersistentData::assert_matches_layout();
+}
+
+fn test_read_write() {
+    {
+        let mut accessor = unsafe { PersistentDataAccessor::new() };
+        accessor.get_mut().fht.fht_marker = 0xfe9cd1c0;
+    }
+    {
+        let accessor = unsafe { PersistentDataAccessor::new() };
+        assert_eq!(accessor.get().fht.fht_marker, 0xfe9cd1c0);
+    }
+}
+
+test_suite! {
+    test_persistent_data_layout,
+    test_read_write,
+}

drivers/tests/integration_tests.rs

@@ -1019,3 +1019,8 @@ fn test_trng_in_etrng_mode() {
     let trng_block = model.mailbox_execute(0, &[]).unwrap();
     assert_eq!(trng_block, Some(block1.as_bytes().to_vec()));
 }
+
+#[test]
+fn test_persistent() {
+    run_driver_test("persistent");
+}