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diff --git a/test/util/platform_util.h b/test/util/platform_util.h
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+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef GVISOR_TEST_UTIL_PLATFORM_UTIL_H_
+#define GVISOR_TEST_UTIL_PLATFORM_UTIL_H_
+
+namespace gvisor {
+namespace testing {
+
+// PlatformSupport is a generic enumeration of classes of support.
+//
+// It is up to the individual functions and callers to agree on the precise
+// definition for each case. The document here generally refers to 32-bit
+// as an example. Many cases will use only NotSupported and Allowed.
+enum class PlatformSupport {
+  // The feature is not supported on the current platform.
+  //
+  // In the case of 32-bit, this means that calls will generally be interpreted
+  // as 64-bit calls, and there is no support for 32-bit binaries, long calls,
+  // etc. This usually means that the underlying implementation just pretends
+  // that 32-bit doesn't exist.
+  NotSupported,
+
+  // Calls will be ignored by the kernel with a fixed error.
+  Ignored,
+
+  // Calls will result in a SIGSEGV or similar fault.
+  Segfault,
+
+  // The feature is supported as expected.
+  //
+  // In the case of 32-bit, this means that the system call or far call will be
+  // handled properly.
+  Allowed,
+};
+
+PlatformSupport PlatformSupport32Bit();
+PlatformSupport PlatformSupportAlignmentCheck();
+PlatformSupport PlatformSupportMultiProcess();
+PlatformSupport PlatformSupportInt3();
+
+}  // namespace testing
+}  // namespace gvisor
+
+#endif  // GVISOR_TEST_UTIL_PLATFORM_UTL_H_