tests/runner: install a fake SSDT when running tests

This accomplishes the following things:
- Testing the table installation interface
- Testing the SSDT loading code
- Giving tests the ability to identify the uACPI test runner

Signed-off-by: Daniil Tatianin <99danilt@gmail.com>

tests/runner/test_runner.cpp

@@ -211,6 +211,27 @@ uint8_t table_override[] = {
     0x6e, 0x6e, 0x65, 0x72, 0x00
 };
 
+/*
+ * DefinitionBlock ("x.aml", "SSDT", 1, "uTEST", "RUNRIDTB", 0xF0F0F0F0)
+ * {
+ *     Name (\_SI.TID, "uACPI")
+ *     Printf("TestRunner ID SSDT loaded!")
+ * }
+ */
+uint8_t runner_id_table[] = {
+    0x53, 0x53, 0x44, 0x54, 0x55, 0x00, 0x00, 0x00,
+    0x01, 0x45, 0x75, 0x54, 0x45, 0x53, 0x54, 0x00,
+    0x52, 0x55, 0x4e, 0x52, 0x49, 0x44, 0x54, 0x42,
+    0xf0, 0xf0, 0xf0, 0xf0, 0x49, 0x4e, 0x54, 0x4c,
+    0x25, 0x09, 0x20, 0x20, 0x08, 0x5c, 0x2e, 0x5f,
+    0x53, 0x49, 0x5f, 0x54, 0x49, 0x44, 0x5f, 0x0d,
+    0x75, 0x41, 0x43, 0x50, 0x49, 0x00, 0x70, 0x0d,
+    0x54, 0x65, 0x73, 0x74, 0x52, 0x75, 0x6e, 0x6e,
+    0x65, 0x72, 0x20, 0x49, 0x44, 0x20, 0x53, 0x53,
+    0x44, 0x54, 0x20, 0x6c, 0x6f, 0x61, 0x64, 0x65,
+    0x64, 0x21, 0x00, 0x5b, 0x31
+};
+
 static uacpi_table_installation_disposition handle_table_install(
     struct acpi_sdt_hdr *hdr, uacpi_u64 *out_override
 )
@@ -318,9 +339,25 @@ static void run_test(
     st = uacpi_enable_host_interface(UACPI_HOST_INTERFACE_MODULE_DEVICE);
     ensure_ok_status(st);
 
+    if (mode == run_mode::TEST) {
+        st = uacpi_table_install(runner_id_table, UACPI_NULL);
+        ensure_ok_status(st);
+    }
+
     st = uacpi_namespace_load();
     ensure_ok_status(st);
 
+    if (mode == run_mode::TEST) {
+        uacpi_object *runner_id;
+        st = uacpi_eval_typed(UACPI_NULL, "\\_SI.TID", UACPI_NULL,
+                              UACPI_OBJECT_STRING_BIT, &runner_id);
+        ensure_ok_status(st);
+
+        if (strcmp(runner_id->buffer->text, "uACPI") != 0)
+            throw std::runtime_error("invalid test runner id");
+        uacpi_object_unref(runner_id);
+    }
+
     st = uacpi_namespace_initialize();
     ensure_ok_status(st);