#
# Jailhouse, a Linux-based partitioning hypervisor
#
# Copyright (c) Siemens AG, 2013
# Copyright (c) Valentine Sinitsyn, 2014
#
# Authors:
#  Jan Kiszka <jan.kiszka@siemens.com>
#  Valentine Sinitsyn <valentine.sinitsyn@gmail.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.  See
# the COPYING file in the top-level directory.
#
# asm-defines.h generation code derived from linux/Kbuild:
#
# Copyright (c) Linux kernel developers, 2014
#

LINUXINCLUDE := -I$(src)/arch/$(SRCARCH)/include -I$(src)/include
KBUILD_CFLAGS := -g -Os -Wall -Wstrict-prototypes -Wtype-limits \
		 -Wmissing-declarations -Wmissing-prototypes \
		 -fno-strict-aliasing -fno-pic -fno-common \
		 -fno-stack-protector -fno-builtin-ffsl

ifeq ($(SRCARCH),x86)
KBUILD_CFLAGS += -mcmodel=kernel -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
KBUILD_CPPFLAGS += -m64
BUILD_VARIANTS := amd intel
endif

ifeq ($(SRCARCH),arm)
KBUILD_CFLAGS += -marm
endif

ifneq ($(wildcard $(obj)/include/jailhouse/config.h),)
KBUILD_CFLAGS += -include $(obj)/include/jailhouse/config.h
endif

CORE_OBJECTS = setup.o printk.o paging.o control.o lib.o mmio.o

define filechk_config_mk
(									\
	echo "\$$(foreach config,\$$(filter CONFIG_%,		\
		\$$(.VARIABLES)), \$$(eval undefine \$$(config)))";	\
	if [ -f $(src)/include/jailhouse/config.h ]; then		\
		sed -e "/^#define \([^[:space:]]*\)[[:space:]]*1/!d"	\
		    -e "s/^#define \([^[:space:]]*\)[[:space:]]*1/\1=y/" \
			$(src)/include/jailhouse/config.h;		\
	fi								\
)
endef

$(obj)/include/generated/config.mk: Makefile FORCE
	$(call filechk,config_mk)

define filechk_version
	$(src)/../scripts/gen_version_h $(src)/..
endef

clean-dirs += include/generated/

define sed-y
	"/^=>/{s:=>#\(.*\):/* \1 */:; \
	s:^=>\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:^=>\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:=>::; p;}"
endef

quiet_cmd_defines = GEN     $@
define cmd_defines
	(set -e; \
	 echo "#ifndef _GENERATED_ASM_DEFINES_H"; \
	 echo "#define _GENERATED_ASM_DEFINES_H"; \
	 echo "/*"; \
	 echo " * This file is autogenerated. If you need to change it,"; \
	 echo " * edit arch/$(SRCARCH)/asm-defines.c instead."; \
	 echo " *"; \
	 echo " * ALL MANUAL CHANGES TO THIS FILE WILL BE LOST!"; \
	 echo " */"; \
	 echo ""; \
	 sed -ne $(sed-y) $<; \
	 echo ""; \
	 echo "#endif" ) > $@
endef

defines-file := include/generated/asm-defines.h

targets := $(defines-file) arch/$(SRCARCH)/asm-defines.s

$(obj)/arch/$(SRCARCH)/asm-defines.s: $(src)/arch/$(SRCARCH)/asm-defines.c
	$(call if_changed_dep,cc_s_c)

$(obj)/$(defines-file): $(obj)/arch/$(SRCARCH)/asm-defines.s
	$(Q)mkdir -p $(dir $@)
	$(call cmd,defines)

$(obj)/include/generated/version.h: $(src)/Makefile FORCE
	$(call filechk,version)

$(foreach co,$(CORE_OBJECTS),\
	$(eval $(obj)/$(co): $(obj)/$(defines-file)))

$(obj)/setup.o: $(obj)/include/generated/version.h

arch-builtin: $(obj)/$(defines-file) $(obj)/include/generated/config.mk FORCE
	$(Q)$(MAKE) $(build)=$(obj)/arch/$(SRCARCH) \
		CONFIG_MK=$(obj)/include/generated/config.mk

always :=

define BUILD_JAILHOUSE_template
always += jailhouse$(1).bin

hypervisor$(1)-y := $$(CORE_OBJECTS) arch/$$(SRCARCH)/built-in$(1).o \
	hypervisor.lds
targets += $$(hypervisor$(1)-y)

# Need fake recipe here so make will consider this a volatile target
$$(obj)/arch/$$(SRCARCH)/built-in$(1).o: arch-builtin
	@

HYPERVISOR$(1)_OBJS = $$(addprefix $$(obj)/,$$(hypervisor$(1)-y))

LDFLAGS_hypervisor$(1).o := -T

targets += hypervisor$(1).o
$$(obj)/hypervisor$(1).o: $$(src)/hypervisor.lds $$(HYPERVISOR$(1)_OBJS)
	$$(call if_changed,ld)

OBJCOPYFLAGS_jailhouse$(1).bin := -O binary -R .eh_frame

targets += jailhouse$(1).bin
$$(obj)/jailhouse$(1).bin: $$(obj)/hypervisor$(1).o
	$$(call if_changed,objcopy)
endef

ifneq ($(BUILD_VARIANTS),)
$(foreach variant,$(BUILD_VARIANTS),\
	$(eval $(call BUILD_JAILHOUSE_template,-$(variant))))
else
$(eval $(call BUILD_JAILHOUSE_template,))
endif

.PHONY: arch-builtin