src/cpu/Makefile.inc

################################################################################
## Subdirectories
################################################################################
subdirs-y += allwinner
subdirs-y += amd
subdirs-y += dmp
subdirs-y += armltd
subdirs-y += imgtec
subdirs-y += intel
subdirs-y += ti
subdirs-y += via
subdirs-$(CONFIG_ARCH_X86) += x86
subdirs-$(CONFIG_CPU_QEMU_X86) += qemu-x86

$(eval $(call create_class_compiler,cpu_microcode,x86_32))
$(eval $(call create_class_compiler,cpu_microcode,x86_64))
################################################################################
## Rules for building the microcode blob in CBFS
################################################################################

# External microcode file, or are we generating one ?
ifeq ($(CONFIG_CPU_MICROCODE_CBFS_EXTERNAL), y)
cpu_ucode_cbfs_file = $(call strip_quotes,$(CONFIG_CPU_MICROCODE_FILE))
cbfs_include_ucode = y
endif

ifeq ($(CONFIG_CPU_MICROCODE_CBFS_GENERATE), y)
cpu_ucode_cbfs_file = $(obj)/cpu_microcode_blob.bin
cbfs_include_ucode = y
endif

# In case we have more than one "source" (cough) files containing microcode, we
# link them together in one large blob, so that we get all the microcode updates
# in one file. This makes it easier for objcopy in the final step.
# The --entry=0 is just here to suppress the LD warning. It does not affect the
# final microcode file.
$(obj)/cpu_microcode_blob.o: $$(cpu_microcode-objs)
	@printf "    LD         $(subst $(obj)/,,$(@))\n"
	$(LD_cpu_microcode) -static --entry=0 $+ -o $@

# We have a lot of useless data in the large blob, and we are only interested in
# the data section, so we only copy that part to the final microcode file
$(obj)/cpu_microcode_blob.bin: $(obj)/cpu_microcode_blob.o
	@printf "    MICROCODE  $(subst $(obj)/,,$(@))\n"
	$(OBJCOPY_cpu_microcode) -j .data -O binary $< $@

cbfs-files-$(cbfs_include_ucode) += cpu_microcode_blob.bin
cpu_microcode_blob.bin-file := $(cpu_ucode_cbfs_file)
cpu_microcode_blob.bin-type := microcode

ifneq ($(CONFIG_CPU_MICROCODE_CBFS_LOC),)
cpu_microcode_blob.bin-position := $(CONFIG_CPU_MICROCODE_CBFS_LOC)
else
cpu_microcode_blob.bin-align := 16
endif