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

1 files changed, 85 insertions, 0 deletions

diff --git a/pkg/ring0/BUILD b/pkg/ring0/BUILD
new file mode 100644
index 000000000..d1b14efdb
--- /dev/null
+++ b/pkg/ring0/BUILD
@@ -0,0 +1,85 @@
+load("//tools:defs.bzl", "arch_genrule", "go_library")
+load("//tools/go_generics:defs.bzl", "go_template", "go_template_instance")
+
+package(licenses = ["notice"])
+
+go_template(
+    name = "defs_amd64",
+    srcs = [
+        "defs.go",
+        "defs_amd64.go",
+        "offsets_amd64.go",
+        "x86.go",
+    ],
+    visibility = [":__subpackages__"],
+)
+
+go_template(
+    name = "defs_arm64",
+    srcs = [
+        "aarch64.go",
+        "defs.go",
+        "defs_arm64.go",
+        "offsets_arm64.go",
+    ],
+    visibility = [":__subpackages__"],
+)
+
+go_template_instance(
+    name = "defs_impl_amd64",
+    out = "defs_impl_amd64.go",
+    package = "ring0",
+    template = ":defs_amd64",
+)
+
+go_template_instance(
+    name = "defs_impl_arm64",
+    out = "defs_impl_arm64.go",
+    package = "ring0",
+    template = ":defs_arm64",
+)
+
+arch_genrule(
+    name = "entry_impl_amd64",
+    srcs = ["entry_amd64.s"],
+    outs = ["entry_impl_amd64.s"],
+    cmd = "(echo -e '// build +amd64\\n' && QEMU $(location //pkg/ring0/gen_offsets) && cat $(location entry_amd64.s)) > $@",
+    tools = ["//pkg/ring0/gen_offsets"],
+)
+
+arch_genrule(
+    name = "entry_impl_arm64",
+    srcs = ["entry_arm64.s"],
+    outs = ["entry_impl_arm64.s"],
+    cmd = "(echo -e '// build +arm64\\n' && QEMU $(location //pkg/ring0/gen_offsets) && cat $(location entry_arm64.s)) > $@",
+    tools = ["//pkg/ring0/gen_offsets"],
+)
+
+go_library(
+    name = "ring0",
+    srcs = [
+        "defs_impl_amd64.go",
+        "defs_impl_arm64.go",
+        "entry_amd64.go",
+        "entry_arm64.go",
+        "entry_impl_amd64.s",
+        "entry_impl_arm64.s",
+        "kernel.go",
+        "kernel_amd64.go",
+        "kernel_arm64.go",
+        "kernel_unsafe.go",
+        "lib_amd64.go",
+        "lib_amd64.s",
+        "lib_arm64.go",
+        "lib_arm64.s",
+        "ring0.go",
+    ],
+    visibility = ["//pkg/sentry:internal"],
+    deps = [
+        "//pkg/cpuid",
+        "//pkg/ring0/pagetables",
+        "//pkg/safecopy",
+        "//pkg/sentry/arch",
+        "//pkg/usermem",
+    ],
+)