LinuxBoot: refactor payload

Clean and refactor the structure of the LinuxBoot payload integration,
to make it more modular and readable. The kernel and initramfs should
handled in separated makefiles.

tested with:
- qemu-i440fx (x86, x86_64)
- cavium CN8100 (arm64)

Change-Id: I41d0275a5f7efb920e881f43b0acda29f41ee221
Signed-off-by: Marcello Sylvester Bauer <info@marcellobauer.com>
Reviewed-on: https://review.coreboot.org/c/29581
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

1 files changed, 27 insertions, 68 deletions

diff --git a/payloads/external/LinuxBoot/Makefile b/payloads/external/LinuxBoot/Makefile
index 6d852cb2df..a9b35fc120 100644
--- a/payloads/external/LinuxBoot/Makefile
+++ b/payloads/external/LinuxBoot/Makefile
@@ -1,6 +1,7 @@
 ## This file is part of the coreboot project.
 ##
 ## Copyright (C) 2017 Facebook Inc.
+## Copyright (C) 2018 9elements Cyber Security
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -12,90 +13,48 @@
 ## GNU General Public License for more details.
 ##
 
-kernel_tarball=https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-$(CONFIG_LINUXBOOT_KERNEL_VERSION).tar.xz
 project_dir=linuxboot
 kernel_dir=$(project_dir)/kernel
 
 unexport $(COREBOOT_EXPORTS)
 unexport MAKEFLAGS
 
-XGCCPATH?=$(PWD)/util/crossgcc/xgcc/bin
-ifeq ($(CONFIG_LINUXBOOT_ARCH),386)
-LINUXBOOT_COMPILE?=$(XGCCPATH)/i386-linux-
-ARCH?=x86
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),amd64)
-LINUXBOOT_COMPILE?=$(XGCCPATH)/x86_64-linux-
-ARCH?=x86_64
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),arm64)
-LINUXBOOT_COMPILE?=$(XGCCPATH)/aarch64-linux-
-ARCH?=arm64
-endif
-
-OBJCOPY:=$(LINUXBOOT_COMPILE)objcopy
-
 all: linuxboot
 
-toolchain:
-	if [[ ! -x "$(LINUXBOOT_COMPILE)gcc" ]]; then \
-	echo "Toolchain '$(LINUXBOOT_COMPILE)*' is missing."; \
+u-root:
+	$(MAKE) -f targets/u-root.mk
+
+ifeq ($(CONFIG_LINUXBOOT_BUILD_INITRAMFS),y)
+ifeq ($(CONFIG_LINUXBOOT_UROOT),y)
+initramfs: u-root
+endif
+else
+ifneq ($(CONFIG_LINUXBOOT_INITRAMFS),)
+initramfs:
+	if [[ ! -f "$(top)/$(CONFIG_LINUXBOOT_INITRAMFS)" ]]; then \
+	echo "<< Linux initramfs '$(CONFIG_LINUXBOOT_INITRAMFS)' is missing. >>"; \
 	exit 1; \
 	fi
-
-$(kernel_dir)/.config:
-	echo "    WWW        Download Linux $(CONFIG_LINUXBOOT_KERNEL_VERSION)"
-	mkdir -p $(kernel_dir)
-ifeq ("$(wildcard $(kernel_dir)/README)","")
-	curl -s $(kernel_tarball) | tar xJ -C $(kernel_dir) --strip 1
 endif
-
-config: $(kernel_dir)/.config
-	echo "    CONFIG     Linux $(CONFIG_LINUXBOOT_KERNEL_VERSION)"
-ifneq ($(CONFIG_LINUXBOOT_KERNEL_CONFIGFILE),)
-	cp $(CONFIG_LINUXBOOT_KERNEL_CONFIGFILE) $(kernel_dir)/.config
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),386)
-	cp x86/defconfig $(kernel_dir)/.config
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),amd64)
-	cp x86_64/defconfig $(kernel_dir)/.config
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),arm64)
-	cp arm64/defconfig $(kernel_dir)/.config
 endif
 
-ifneq (,$(filter $(CONFIG_LINUXBOOT_ARCH),386 amd64))
-$(kernel_dir)/arch/x86/boot/bzImage: config toolchain
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),arm64)
-$(kernel_dir)/vmlinux: config toolchain
-endif
-	echo "    MAKE       Kernel $(CONFIG_LINUXBOOT_KERNEL_VERSION)"
-	$(MAKE) -C $(kernel_dir) olddefconfig CROSS_COMPILE=$(LINUXBOOT_COMPILE) ARCH=$(ARCH)
-	$(MAKE) -C $(kernel_dir) -j $(CPUS) CROSS_COMPILE=$(LINUXBOOT_COMPILE) ARCH=$(ARCH)
-
-ifneq (,$(filter $(CONFIG_LINUXBOOT_ARCH),386 amd64))
-$(project_dir)/kernel-image: $(kernel_dir)/arch/x86/boot/bzImage
-	cp $< $@
-else ifeq ($(CONFIG_LINUXBOOT_ARCH),arm64)
-$(project_dir)/vmlinux.bin: $(kernel_dir)/vmlinux
-	$(OBJCOPY) -O binary $< $@
-
-$(project_dir)/target.dtb: $(PWD)/$(CONFIG_LINUXBOOT_DTB_FILE)
-	cp $< $@
-
-$(project_dir)/vmlinux.bin.lzma: $(project_dir)/vmlinux.bin
-	xz -c -k -f --format=lzma --lzma1=dict=1MiB,lc=3,lp=0,pb=3 $< > $@
-
-$(project_dir)/kernel-image: $(project_dir)/vmlinux.bin.lzma $(project_dir)/../arm64/kernel_fdt_lzma.its $(project_dir)/target.dtb $(PWD)/$(CONFIG_LINUX_INITRD)
-	cp $(project_dir)/../arm64/kernel_fdt_lzma.its $(project_dir)
-	mkimage -f $(project_dir)/kernel_fdt_lzma.its $@
+ifeq ($(CONFIG_LINUXBOOT_COMPILE_KERNEL),y)
+ifeq ($(CONFIG_LINUXBOOT_ARCH),arm64)
+kernel: initramfs
+	$(MAKE) -f targets/linux.mk
+else
+kernel:
+	$(MAKE) -f targets/linux.mk
 endif
-
-ifeq ($(CONFIG_LINUXBOOT_UROOT),y)
-$(PWD)/$(CONFIG_LINUX_INITRD):
-	$(MAKE) -f targets/u-root.mk
 else
-$(PWD)/$(CONFIG_LINUX_INITRD):
-	echo "Building without u-root support"
+kernel:
+	if [[ ! -f "$(top)/$(CONFIG_LINUXBOOT_KERNEL)" ]]; then \
+	echo "<< Linux kernel '$(CONFIG_LINUXBOOT_KERNEL)' is missing. >>"; \
+	exit 1; \
+	fi
 endif
 
-linuxboot: $(project_dir)/kernel-image $(PWD)/$(CONFIG_LINUX_INITRD)
+linuxboot: kernel initramfs
 
 clean:
 	if [ -d "$(kernel_dir)" ]; then rm -rf $(kernel_dir); fi
@@ -104,4 +63,4 @@ clean:
 distclean:
 	rm -rf $(project_dir)
 
-.PHONY: config patch payload clean distclean clone fetch all toolchain
+.PHONY: linuxboot kernel initramfs u-root clean distclean