1. 根目录:
2. arch
3. ia64
4. xen
5. Makefile

#
# Makefile for Xen components
#

obj-y := hypercall.o xenivt.o xensetup.o xen_pv_ops.o irq_xen.o \
	 hypervisor.o xencomm.o xcom_hcall.o grant-table.o time.o suspend.o \
	 gate-data.o

obj-$(CONFIG_IA64_GENERIC) += machvec.o

# The gate DSO image is built using a special linker script.
include $(srctree)/arch/ia64/kernel/Makefile.gate

# tell compiled for xen
CPPFLAGS_gate.lds += -D__IA64_GATE_PARAVIRTUALIZED_XEN
AFLAGS_gate.o += -D__IA64_ASM_PARAVIRTUALIZED_XEN -D__IA64_GATE_PARAVIRTUALIZED_XEN

# use same file of native.
$(obj)/gate.o: $(src)/../kernel/gate.S FORCE
	$(call if_changed_dep,as_o_S)
$(obj)/gate.lds: $(src)/../kernel/gate.lds.S FORCE
	$(call if_changed_dep,cpp_lds_S)


AFLAGS_xenivt.o += -D__IA64_ASM_PARAVIRTUALIZED_XEN

# xen multi compile
ASM_PARAVIRT_MULTI_COMPILE_SRCS = ivt.S entry.S fsys.S
ASM_PARAVIRT_OBJS = $(addprefix xen-,$(ASM_PARAVIRT_MULTI_COMPILE_SRCS:.S=.o))
obj-y += $(ASM_PARAVIRT_OBJS)
define paravirtualized_xen
AFLAGS_$(1) += -D__IA64_ASM_PARAVIRTUALIZED_XEN
endef
$(foreach o,$(ASM_PARAVIRT_OBJS),$(eval $(call paravirtualized_xen,$(o))))

$(obj)/xen-%.o: $(src)/../kernel/%.S FORCE
	$(call if_changed_dep,as_o_S)