[hw/top] Create top desc and top library targets for all tops

Signed-off-by: Amaury Pouly <[email protected]>

hw/top/BUILD

@@ -2,3 +2,80 @@
 # Licensed under the Apache License, Version 2.0, see LICENSE for details.
 # SPDX-License-Identifier: Apache-2.0
 
+load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
+load("//rules/opentitan:hw.bzl", "describe_top", "select_top_ld", "select_top_lib")
+load("//hw/top:defs.bzl", "ALL_TOPS", "ALL_TOP_NAMES")
+
+package(default_visibility = ["//visibility:public"])
+
+# Use this flag to select the top.
+string_flag(
+    name = "top",
+    build_setting_default = "earlgrey",
+    values = ALL_TOP_NAMES,
+)
+
+# Config settings to test against tops.
+[
+    config_setting(
+        name = "is_{}".format(top),
+        flag_values = {
+            ":top": top,
+        },
+    )
+    for top in ALL_TOP_NAMES
+]
+
+[
+    describe_top(
+        name = "top_{}_desc".format(top),
+        all_tops = ALL_TOPS,
+        top = top,
+    )
+    for top in ALL_TOP_NAMES
+]
+
+# Point to the right top description.
+alias(
+    name = "top_desc",
+    actual = select({
+        "is_{}".format(top): ":top_{}_desc".format(top)
+        for top in ALL_TOP_NAMES
+    }),
+)
+
+[
+    select_top_lib(
+        name = "top_{}_lib".format(top),
+        all_tops = ALL_TOPS,
+        top = top,
+    )
+    for top in ALL_TOP_NAMES
+]
+
+# Point to the right top library.
+alias(
+    name = "top_lib",
+    actual = select({
+        "is_{}".format(top): ":top_{}_lib".format(top)
+        for top in ALL_TOP_NAMES
+    }),
+)
+
+[
+    select_top_ld(
+        name = "top_{}_ld".format(top),
+        all_tops = ALL_TOPS,
+        top = top,
+    )
+    for top in ALL_TOP_NAMES
+]
+
+# Point to the right top library.
+alias(
+    name = "top_ld",
+    actual = select({
+        "is_{}".format(top): ":top_{}_ld".format(top)
+        for top in ALL_TOP_NAMES
+    }),
+)