diff --git a/osbase/build/mkucode/spec/BUILD.bazel b/osbase/build/mkucode/spec/BUILD.bazel
new file mode 100644
index 0000000..0210a4b
--- /dev/null
+++ b/osbase/build/mkucode/spec/BUILD.bazel
@@ -0,0 +1,30 @@
+load("@rules_proto//proto:defs.bzl", "proto_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
+
+proto_library(
+    name = "mkucode_proto",
+    srcs = ["spec.proto"],
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "mkucode_go_proto",
+    importpath = "source.monogon.dev/osbase/build/mkucode",
+    proto = ":mkucode_proto",
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "spec",
+    embed = [":spec_go_proto"],
+    importpath = "source.monogon.dev/osbase/build/mkucode/spec",
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "spec_go_proto",
+    importpath = "source.monogon.dev/osbase/build/mkucode/spec",
+    proto = ":mkucode_proto",
+    visibility = ["//visibility:public"],
+)
diff --git a/osbase/build/mkucode/spec/gomod-generated-placeholder.go b/osbase/build/mkucode/spec/gomod-generated-placeholder.go
new file mode 100644
index 0000000..f09cd57
--- /dev/null
+++ b/osbase/build/mkucode/spec/gomod-generated-placeholder.go
@@ -0,0 +1 @@
+package spec
diff --git a/osbase/build/mkucode/spec/spec.proto b/osbase/build/mkucode/spec/spec.proto
new file mode 100644
index 0000000..36fcc4c
--- /dev/null
+++ b/osbase/build/mkucode/spec/spec.proto
@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+package osbase.build.mkucode;
+option go_package = "source.monogon.dev/osbase/build/mkucode/spec";
+
+message UCode {
+  repeated UCodeVendor vendor = 1;
+}
+
+message UCodeVendor {
+  // The vendor id (as given in cpuid) of the CPU the microcode is for, like
+  // GenuineIntel or AuthenticAMD.
+  string id = 1;
+
+  // List of paths to microcode files from for CPUs from the vendor.
+  repeated string file = 2;
+}
\ No newline at end of file