1# SPDX-License-Identifier: GPL-2.0
2
3# to be include'd by arch/$(ARCH)/boot/Makefile after setting
4# EFI_ZBOOT_PAYLOAD, EFI_ZBOOT_BFD_TARGET and EFI_ZBOOT_MACH_TYPE
5
6comp-type-$(CONFIG_KERNEL_GZIP)		:= gzip
7comp-type-$(CONFIG_KERNEL_LZ4)		:= lz4
8comp-type-$(CONFIG_KERNEL_LZMA)		:= lzma
9comp-type-$(CONFIG_KERNEL_LZO)		:= lzo
10comp-type-$(CONFIG_KERNEL_XZ)		:= xzkern
11comp-type-$(CONFIG_KERNEL_ZSTD)		:= zstd22
12
13# in GZIP, the appended le32 carrying the uncompressed size is part of the
14# format, but in other cases, we just append it at the end for convenience,
15# causing the original tools to complain when checking image integrity.
16# So disregard it when calculating the payload size in the zimage header.
17zboot-method-y				:= $(comp-type-y)_with_size
18zboot-size-len-y			:= 4
19
20zboot-method-$(CONFIG_KERNEL_GZIP)	:= gzip
21zboot-size-len-$(CONFIG_KERNEL_GZIP)	:= 0
22
23quiet_cmd_sbsign = SBSIGN  $@
24      cmd_sbsign = sbsign --out $@ $< \
25		   --key $(CONFIG_EFI_ZBOOT_SIGNING_KEY) \
26		   --cert $(CONFIG_EFI_ZBOOT_SIGNING_CERT)
27
28$(obj)/$(EFI_ZBOOT_PAYLOAD).signed: $(obj)/$(EFI_ZBOOT_PAYLOAD) FORCE
29	$(call if_changed,sbsign)
30
31ZBOOT_PAYLOAD-y				 := $(EFI_ZBOOT_PAYLOAD)
32ZBOOT_PAYLOAD-$(CONFIG_EFI_ZBOOT_SIGNED) := $(EFI_ZBOOT_PAYLOAD).signed
33
34$(obj)/vmlinuz: $(obj)/$(ZBOOT_PAYLOAD-y) FORCE
35	$(call if_changed,$(zboot-method-y))
36
37OBJCOPYFLAGS_vmlinuz.o := -I binary -O $(EFI_ZBOOT_BFD_TARGET) \
38			 --rename-section .data=.gzdata,load,alloc,readonly,contents
39$(obj)/vmlinuz.o: $(obj)/vmlinuz FORCE
40	$(call if_changed,objcopy)
41
42AFLAGS_zboot-header.o += -DMACHINE_TYPE=IMAGE_FILE_MACHINE_$(EFI_ZBOOT_MACH_TYPE) \
43			 -DZBOOT_EFI_PATH="\"$(realpath $(obj)/vmlinuz.efi.elf)\"" \
44			 -DZBOOT_SIZE_LEN=$(zboot-size-len-y) \
45			 -DCOMP_TYPE="\"$(comp-type-y)\""
46
47$(obj)/zboot-header.o: $(srctree)/drivers/firmware/efi/libstub/zboot-header.S FORCE
48	$(call if_changed_rule,as_o_S)
49
50ZBOOT_DEPS := $(obj)/zboot-header.o $(objtree)/drivers/firmware/efi/libstub/lib.a
51
52LDFLAGS_vmlinuz.efi.elf := -T $(srctree)/drivers/firmware/efi/libstub/zboot.lds
53$(obj)/vmlinuz.efi.elf: $(obj)/vmlinuz.o $(ZBOOT_DEPS) FORCE
54	$(call if_changed,ld)
55
56ZBOOT_EFI-y				:= vmlinuz.efi
57ZBOOT_EFI-$(CONFIG_EFI_ZBOOT_SIGNED)	:= vmlinuz.efi.unsigned
58
59OBJCOPYFLAGS_$(ZBOOT_EFI-y) := -O binary
60$(obj)/$(ZBOOT_EFI-y): $(obj)/vmlinuz.efi.elf FORCE
61	$(call if_changed,objcopy)
62
63targets += zboot-header.o vmlinuz vmlinuz.o vmlinuz.efi.elf vmlinuz.efi
64
65ifneq ($(CONFIG_EFI_ZBOOT_SIGNED),)
66$(obj)/vmlinuz.efi: $(obj)/vmlinuz.efi.unsigned FORCE
67	$(call if_changed,sbsign)
68endif
69
70targets += $(EFI_ZBOOT_PAYLOAD).signed vmlinuz.efi.unsigned
71