Move ring0 package.

This allows the package to serve as a general purpose ring0 support package, as
opposed to being bound to specific sentry platforms.

Updates #5039

PiperOrigin-RevId: 355220044

2 files changed, 64 insertions, 0 deletions

diff --git a/pkg/ring0/gen_offsets/BUILD b/pkg/ring0/gen_offsets/BUILD
new file mode 100644
index 000000000..15b93d61c
--- /dev/null
+++ b/pkg/ring0/gen_offsets/BUILD
@@ -0,0 +1,40 @@
+load("//tools:defs.bzl", "go_binary")
+load("//tools/go_generics:defs.bzl", "go_template_instance")
+
+package(licenses = ["notice"])
+
+go_template_instance(
+    name = "defs_impl_arm64",
+    out = "defs_impl_arm64.go",
+    package = "main",
+    template = "//pkg/ring0:defs_arm64",
+)
+
+go_template_instance(
+    name = "defs_impl_amd64",
+    out = "defs_impl_amd64.go",
+    package = "main",
+    template = "//pkg/ring0:defs_amd64",
+)
+
+go_binary(
+    name = "gen_offsets",
+    srcs = [
+        "defs_impl_amd64.go",
+        "defs_impl_arm64.go",
+        "main.go",
+    ],
+    # Use the libc malloc to avoid any extra dependencies. This is required to
+    # pass the sentry deps test.
+    system_malloc = True,
+    visibility = [
+        "//pkg/ring0:__pkg__",
+        "//pkg/sentry/platform/kvm:__pkg__",
+    ],
+    deps = [
+        "//pkg/cpuid",
+        "//pkg/ring0/pagetables",
+        "//pkg/sentry/arch",
+        "//pkg/usermem",
+    ],
+)
diff --git a/pkg/ring0/gen_offsets/main.go b/pkg/ring0/gen_offsets/main.go
new file mode 100644
index 000000000..a4927da2f
--- /dev/null
+++ b/pkg/ring0/gen_offsets/main.go
@@ -0,0 +1,24 @@
+// Copyright 2018 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.
+
+// Binary gen_offsets is a helper for generating offset headers.
+package main
+
+import (
+	"os"
+)
+
+func main() {
+	Emit(os.Stdout)
+}