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, EFI_ZBOOT_MACH_TYPE and
5# EFI_ZBOOT_FORWARD_CFI
6
7quiet_cmd_copy_and_pad = PAD     $@
8      cmd_copy_and_pad = cp $< $@ && \
9			 truncate -s $(shell hexdump -s16 -n4 -e '"%u"' $<) $@
10
11# Pad the file to the size of the uncompressed image in memory, including BSS
12$(obj)/vmlinux.bin: $(obj)/$(EFI_ZBOOT_PAYLOAD) FORCE
13	$(call if_changed,copy_and_pad)
14
15comp-type-$(CONFIG_KERNEL_GZIP)		:= gzip
16comp-type-$(CONFIG_KERNEL_LZ4)		:= lz4
17comp-type-$(CONFIG_KERNEL_LZMA)		:= lzma
18comp-type-$(CONFIG_KERNEL_LZO)		:= lzo
19comp-type-$(CONFIG_KERNEL_XZ)		:= xzkern
20comp-type-$(CONFIG_KERNEL_ZSTD)		:= zstd22
21
22# in GZIP, the appended le32 carrying the uncompressed size is part of the
23# format, but in other cases, we just append it at the end for convenience,
24# causing the original tools to complain when checking image integrity.
25# So disregard it when calculating the payload size in the zimage header.
26zboot-method-y                         := $(comp-type-y)_with_size
27zboot-size-len-y                       := 4
28
29zboot-method-$(CONFIG_KERNEL_GZIP)     := gzip
30zboot-size-len-$(CONFIG_KERNEL_GZIP)   := 0
31
32$(obj)/vmlinuz: $(obj)/vmlinux.bin FORCE
33	$(call if_changed,$(zboot-method-y))
34
35# avoid eager evaluation to prevent references to non-existent build artifacts
36OBJCOPYFLAGS_vmlinuz.o = -I binary -O $(EFI_ZBOOT_BFD_TARGET) $(EFI_ZBOOT_OBJCOPY_FLAGS) \
37			  --rename-section .data=.gzdata,load,alloc,readonly,contents
38$(obj)/vmlinuz.o: $(obj)/vmlinuz FORCE
39	$(call if_changed,objcopy)
40
41aflags-zboot-header-$(EFI_ZBOOT_FORWARD_CFI) := \
42		-DPE_DLL_CHAR_EX=IMAGE_DLLCHARACTERISTICS_EX_FORWARD_CFI_COMPAT
43
44AFLAGS_zboot-header.o += -DMACHINE_TYPE=IMAGE_FILE_MACHINE_$(EFI_ZBOOT_MACH_TYPE) \
45			 -DZBOOT_EFI_PATH="\"$(realpath $(obj)/vmlinuz.efi.elf)\"" \
46			 -DZBOOT_SIZE_LEN=$(zboot-size-len-y) \
47			 -DCOMP_TYPE="\"$(comp-type-y)\"" \
48			 $(aflags-zboot-header-y)
49
50$(obj)/zboot-header.o: $(srctree)/drivers/firmware/efi/libstub/zboot-header.S FORCE
51	$(call if_changed_rule,as_o_S)
52
53ZBOOT_DEPS := $(obj)/zboot-header.o $(objtree)/drivers/firmware/efi/libstub/lib.a
54
55LDFLAGS_vmlinuz.efi.elf := -T $(srctree)/drivers/firmware/efi/libstub/zboot.lds
56$(obj)/vmlinuz.efi.elf: $(obj)/vmlinuz.o $(ZBOOT_DEPS) FORCE
57	$(call if_changed,ld)
58
59OBJCOPYFLAGS_vmlinuz.efi := -O binary
60$(obj)/vmlinuz.efi: $(obj)/vmlinuz.efi.elf FORCE
61	$(call if_changed,objcopy)
62
63targets += zboot-header.o vmlinux.bin vmlinuz vmlinuz.o vmlinuz.efi.elf vmlinuz.efi
64