ANDROID: bazel: add GKI consolidate Bazel build

Adds //common:kernel_aarch64_consolidate Bazel build target.

Bug: 255878221
Change-Id: I76b44a2764d461d6267ff217e8914298fe560544
Signed-off-by: John Moon <quic_johmoo@quicinc.com>

BUILD.bazel

@@ -245,6 +245,10 @@ define_db845c(
     ],
 )
 
+load(":consolidate.bzl", "define_consolidate")
+
+define_consolidate()
+
 # TODO(b/258259749): Convert rockpi4 to mixed build
 kernel_build(
     name = "rockpi4",

build.config.gki_consolidate.aarch64

@@ -1,3 +1,4 @@
+KERNEL_DIR=common
 DEFCONFIG=consolidate_defconfig
 FRAGMENT_CONFIG=${KERNEL_DIR}/arch/arm64/configs/consolidate.fragment
 PRE_DEFCONFIG_CMDS="KCONFIG_CONFIG=${ROOT_DIR}/${KERNEL_DIR}/arch/arm64/configs/${DEFCONFIG} ${ROOT_DIR}/${KERNEL_DIR}/scripts/kconfig/merge_config.sh -m -r ${ROOT_DIR}/${KERNEL_DIR}/arch/arm64/configs/gki_defconfig ${ROOT_DIR}/${FRAGMENT_CONFIG}"

consolidate.bzl

@@ -0,0 +1,62 @@
+load(
+    "//build/kernel/kleaf:kernel.bzl",
+    "kernel_build",
+    "kernel_build_config",
+    "kernel_images",
+    "kernel_modules_install",
+)
+load("//build/kernel/kleaf:constants.bzl", "aarch64_outs")
+
+rule_base = "kernel_aarch64_consolidate"
+
+def _gen_config_without_source_lines(build_config, target):
+    rule_name = "{}.{}".format(target, build_config)
+    out_file_name = rule_name + ".generated"
+    native.genrule(
+        name = rule_name,
+        srcs = [build_config],
+        outs = [out_file_name],
+        cmd_bash = "sed -e '/^\\. /d' $(location {}) > $@".format(build_config),
+    )
+
+    return ":" + rule_name
+
+def define_consolidate():
+    kernel_build_config(
+        name = rule_base + "_build_config",
+        srcs = [
+            # do not sort
+            "build.config.constants",
+            _gen_config_without_source_lines("build.config.common", rule_base),
+            "build.config.aarch64",
+            "build.config.gki_consolidate.aarch64",
+            _gen_config_without_source_lines("build.config.gki.aarch64", rule_base),
+        ],
+    )
+
+    kernel_build(
+        name = rule_base,
+        outs = aarch64_outs,
+        implicit_outs = [
+            "scripts/sign-file",
+            "certs/signing_key.pem",
+            "certs/signing_key.x509",
+        ],
+        module_implicit_outs = [
+            "drivers/block/zram/zram.ko",
+            "mm/zsmalloc.ko",
+        ],
+        build_config = rule_base + "_build_config",
+    )
+
+    kernel_modules_install(
+        name = "{}_modules_install".format(rule_base),
+        kernel_build = ":{}".format(rule_base),
+    )
+
+    kernel_images(
+        name = "{}_images".format(rule_base),
+        kernel_build = ":{}".format(rule_base),
+        build_system_dlkm = True,
+        kernel_modules_install = ":{}_modules_install".format(rule_base),
+    )