hw: Add kernel/spec/muen/target.mk to build Muen SK

This adds the automated compilation of the Muen Separation Kernel and
the required components to the hw_x86_64_muen build process.

repos/base-hw/src/kernel/spec/muen/target.mk

@@ -0,0 +1,43 @@
+TARGET         = muen
+REQUIRES       = x86_64 muen
+MUEN_SRC_DIR   = $(call select_from_ports,muen)/src/kernel/muen
+MUEN_BUILD_DIR = $(BUILD_BASE_DIR)/kernel
+MUEN_CONF_FILE = $(MUEN_BUILD_DIR)/muen.conf
+MUEN_DST_DIR   = $(MUEN_BUILD_DIR)/muen
+MUEN_LOG       = $(MUEN_BUILD_DIR)/build.log
+
+MUEN_SYSTEM     := $(shell sed -n "/^SYSTEM/s/^.*=\\s*//p" ${MUEN_CONF_FILE})
+MUEN_HARDWARE   := $(shell sed -n "/^HARDWARE/s/^.*=\\s*//p" ${MUEN_CONF_FILE})
+MUEN_COMPONENTS := $(shell sed -n "/^COMPONENTS/s/^.*=\\s*//p" ${MUEN_CONF_FILE})
+GNAT_PATH       := $(shell sed -n "/^GNAT_PATH/s/^.*=\\s*//p" ${MUEN_CONF_FILE})
+SPARK_PATH      := $(shell sed -n "/^SPARK_PATH/s/^.*=\\s*//p" ${MUEN_CONF_FILE})
+
+BUILD_ENV  = PATH=$(GNAT_PATH)/bin:$(SPARK_PATH)/bin:$$PATH
+BUILD_OPTS = SYSTEM=$(MUEN_SYSTEM) HARDWARE=$(MUEN_HARDWARE) NO_PROOF=true
+
+$(TARGET): $(MUEN_DST_DIR)
+	$(MSG_BUILD)Muen kernel
+	$(VERBOSE)$(BUILD_ENV) $(MAKE) -C $(MUEN_DST_DIR) $(BUILD_OPTS) kernel > $(MUEN_LOG) 2>&1
+	$(MSG_BUILD)Muen components
+	$(VERBOSE)$(BUILD_ENV) $(MAKE) -C $(MUEN_DST_DIR)/components \
+		COMPONENTS=$(MUEN_COMPONENTS) $(BUILD_OPTS) > $(MUEN_LOG) 2>&1
+
+$(MUEN_DST_DIR): $(MUEN_SRC_DIR)
+	$(VERBOSE)mkdir -p $(MUEN_DST_DIR)
+	$(VERBOSE)tar c -C $(MUEN_SRC_DIR) . | tar x -C $(MUEN_DST_DIR)
+
+clean cleanall: clean_muen
+
+#
+# Make sure to execute the 'clean_muen' rule prior the generic clean
+# rule in 'prg.mk' because the generic rule will attempt to remove $(TARGET)
+# file, which is a directory in our case.
+#
+clean_prg_objects: clean_muen
+
+clean_muen:
+	$(VERBOSE)rm -rf $(MUEN_DST_DIR)
+	$(VERBOSE)rm -f  $(MUEN_CONF_FILE)
+	$(VERBOSE)rm -f  $(MUEN_LOG)
+
+.PHONY: $(TARGET)