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# SPDX-License-Identifier: GPL-2.0
# to be include'd by arch/$(ARCH)/boot/Makefile after setting
# EFI_ZBOOT_PAYLOAD, EFI_ZBOOT_BFD_TARGET and EFI_ZBOOT_MACH_TYPE
comp-type-$(CONFIG_KERNEL_GZIP) := gzip
comp-type-$(CONFIG_KERNEL_LZ4) := lz4
comp-type-$(CONFIG_KERNEL_LZMA) := lzma
comp-type-$(CONFIG_KERNEL_LZO) := lzo
comp-type-$(CONFIG_KERNEL_XZ) := xzkern
comp-type-$(CONFIG_KERNEL_ZSTD) := zstd22
# in GZIP, the appended le32 carrying the uncompressed size is part of the
# format, but in other cases, we just append it at the end for convenience,
# causing the original tools to complain when checking image integrity.
# So disregard it when calculating the payload size in the zimage header.
zboot-method-y := $(comp-type-y)_with_size
zboot-size-len-y := 4
zboot-method-$(CONFIG_KERNEL_GZIP) := gzip
zboot-size-len-$(CONFIG_KERNEL_GZIP) := 0
quiet_cmd_sbsign = SBSIGN $@
cmd_sbsign = sbsign --out $@ $< \
--key $(CONFIG_EFI_ZBOOT_SIGNING_KEY) \
--cert $(CONFIG_EFI_ZBOOT_SIGNING_CERT)
$(obj)/$(EFI_ZBOOT_PAYLOAD).signed: $(obj)/$(EFI_ZBOOT_PAYLOAD) FORCE
$(call if_changed,sbsign)
ZBOOT_PAYLOAD-y := $(EFI_ZBOOT_PAYLOAD)
ZBOOT_PAYLOAD-$(CONFIG_EFI_ZBOOT_SIGNED) := $(EFI_ZBOOT_PAYLOAD).signed
$(obj)/vmlinuz: $(obj)/$(ZBOOT_PAYLOAD-y) FORCE
$(call if_changed,$(zboot-method-y))
OBJCOPYFLAGS_vmlinuz.o := -I binary -O $(EFI_ZBOOT_BFD_TARGET) \
--rename-section .data=.gzdata,load,alloc,readonly,contents
$(obj)/vmlinuz.o: $(obj)/vmlinuz FORCE
$(call if_changed,objcopy)
AFLAGS_zboot-header.o += -DMACHINE_TYPE=IMAGE_FILE_MACHINE_$(EFI_ZBOOT_MACH_TYPE) \
-DZBOOT_EFI_PATH="\"$(realpath $(obj)/vmlinuz.efi.elf)\"" \
-DZBOOT_SIZE_LEN=$(zboot-size-len-y) \
-DCOMP_TYPE="\"$(comp-type-y)\""
$(obj)/zboot-header.o: $(srctree)/drivers/firmware/efi/libstub/zboot-header.S FORCE
$(call if_changed_rule,as_o_S)
ZBOOT_DEPS := $(obj)/zboot-header.o $(objtree)/drivers/firmware/efi/libstub/lib.a
LDFLAGS_vmlinuz.efi.elf := -T $(srctree)/drivers/firmware/efi/libstub/zboot.lds
$(obj)/vmlinuz.efi.elf: $(obj)/vmlinuz.o $(ZBOOT_DEPS) FORCE
$(call if_changed,ld)
ZBOOT_EFI-y := vmlinuz.efi
ZBOOT_EFI-$(CONFIG_EFI_ZBOOT_SIGNED) := vmlinuz.efi.unsigned
OBJCOPYFLAGS_$(ZBOOT_EFI-y) := -O binary
$(obj)/$(ZBOOT_EFI-y): $(obj)/vmlinuz.efi.elf FORCE
$(call if_changed,objcopy)
targets += zboot-header.o vmlinuz vmlinuz.o vmlinuz.efi.elf vmlinuz.efi
ifneq ($(CONFIG_EFI_ZBOOT_SIGNED),)
$(obj)/vmlinuz.efi: $(obj)/vmlinuz.efi.unsigned FORCE
$(call if_changed,sbsign)
endif
targets += $(EFI_ZBOOT_PAYLOAD).signed vmlinuz.efi.unsigned
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