payloads/external: add support for BOOTBOOT payload

BOOTBOOT is a multi-platform, architecture agnostic boot protocol.
The protocol describes how to boot an ELF64 or PE32+ executable inside
an initial ram disk image into clean 64 bit mode. This version uses
libpayload to do that. Depending on the lib's configuration, initrd
can be in ROM as a cbfs file or a Flashmap partition; on disk a GPT
partition or a file on a FAT formatted ESP partition.
For more information see https://gitlab.com/bztsrc/bootboot

Change-Id: I8692cde0730338026a7760a293c1e37f66004bc0
Signed-off-by: Zoltan Baldaszti <bztemail@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45482
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

payloads/external/BOOTBOOT/Kconfig

@@ -0,0 +1,6 @@
+if PAYLOAD_BOOTBOOT
+
+config PAYLOAD_FILE
+	default "payloads/external/BOOTBOOT/bootboot/dist/bootbootcb.elf"
+
+endif

payloads/external/BOOTBOOT/Kconfig.name

@@ -0,0 +1,8 @@
+config PAYLOAD_BOOTBOOT
+	bool "BOOTBOOT"
+	depends on ARCH_X86 || ARCH_ARM64
+	help
+	  Select this option if you want to build a coreboot image
+	  with a BOOTBOOT Protocol payload.
+
+	  See https://gitlab.com/bztsrc/bootboot for more information.

payloads/external/BOOTBOOT/Makefile

@@ -0,0 +1,44 @@
+project_git_repo=https://gitlab.com/bztsrc/bootboot.git
+project_dir=bootboot
+ifeq ($(CONFIG_COREBOOT_BUILD),)
+include ../../../.config
+endif
+ifeq ($(CONFIG_ARCH_ARM64),y)
+loader_dir=$(project_dir)/aarch64-cb
+else
+loader_dir=$(project_dir)/x86_64-cb
+endif
+
+unexport KCONFIG_AUTOHEADER
+unexport KCONFIG_AUTOCONFIG
+unexport KCONFIG_DEPENDENCIES
+unexport KCONFIG_SPLITCONFIG
+unexport KCONFIG_TRISTATE
+unexport KCONFIG_NEGATIVES
+
+all: bootboot
+
+checkout:
+	echo "    GIT        BOOTBOOT $(loader_dir)"
+	test -L $(project_dir) || test -d $(project_dir) || \
+		git clone $(project_git_repo) $(project_dir)
+
+bootboot: libpayload
+	echo "    MAKE       $(loader_dir)"
+	$(MAKE) -C $(loader_dir) LIBCONFIG_PATH=../../../libpayload
+
+libpayload: checkout
+	cp $(loader_dir)/lib.config ../../libpayload/.config
+	cd ../../libpayload && $(MAKE) oldconfig && \
+		$(MAKE) && $(MAKE) DESTDIR=../external/BOOTBOOT/$(loader_dir) install
+
+clean:
+	test -d $(loader_dir) && $(MAKE) -C $(loader_dir) clean || exit 0
+
+distclean:
+	rm -rf $(project_dir)
+
+print-repo-info:
+	echo "$(project_git_repo) $(project_dir)"
+
+.PHONY: checkout bootboot libpayload clean distclean print-repo-info

payloads/external/Makefile.inc

@@ -303,3 +303,8 @@ payloads/external/Yabits/uefi/build/uefi.elf yabits:
 		CONFIG_YABITS_MASTER=$(CONFIG_YABITS_MASTER) \
 		CONFIG_YABITS_STABLE=$(CONFIG_YABITS_STABLE) \
 		MFLAGS= MAKEFLAGS=
+
+# BOOTBOOT
+
+payloads/external/BOOTBOOT/bootboot/dist/bootbootcb.elf:
+	$(MAKE) -C payloads/external/BOOTBOOT all