.SILENT:


###############################
# Feature stuff
###############################
override SPECTRE_MITIGATION = @SPECTRE_MITIGATION@

ifeq ($(SPECTRE_MITIGATION), 1)
	override SPECTRE_FLAGS=-D__SPECTRE_MITIGATION
else
	override SPECTRE_FLAGS=
endif


###############################
# CFLAGS, QEMU flags + misc
###############################
override ARCH = @ARCH@
override HYRA_VERSION = @PACKAGE_VERSION@
override PROMPT := printf "%s\t\t%s\n"
override KERNEL_DEFINES =  -DHYRA_VERSION="\"$(HYRA_VERSION)\""\
			   -DHYRA_BUILDDATE="\"@HYRA_BUILDDATE@\""\
			   -DHYRA_BUILDBRANCH="\"@HYRA_BUILDBRANCH@\""\
			   -DHYRA_ARCH="\"@ARCH@\""\
			   $(SPECTRE_FLAGS)
override KERNEL_CFLAGS = @KERNEL_CFLAGS@ $(KERNEL_DEFINES)
override KERNEL_LDFLAGS = -nostdlib -zmax-page-size=0x1000 -static -Tconf/link-$(ARCH).ld
override QEMU_FLAGS = @QEMU_FLAGS@

######################
# Binutils stuff
######################
override CC = $(shell pwd)/cross/bin/$(ARCH)-elf-gcc
override LD = $(shell pwd)/cross/bin/$(ARCH)-elf-ld
override AS = $(CC)

##########################
# Architecture specifics
##########################
override ALL_ARCH_CFILES = find sys/ -name "*.c" |  grep "sys/arch/$(ARCH).*"
override ALL_ARCH_ASM_FILES = find sys/ -name "*.S" | grep "sys/arch/$(ARCH).*"
override QEMU = @QEMU@

##########################
# General kernel sources
##########################
override KERNEL_CFILES = $(shell find sys/ -name "*.c" | grep -v "sys/arch/*" | grep -v sys/kern/ksyms.c) $(shell $(ALL_ARCH_CFILES))
override KERNEL_ASMFILES = $(shell find sys/ -name "*.S" | grep -v "sys/arch/*") $(shell $(ALL_ARCH_ASM_FILES))

########################
# Objects & header deps
########################
override KERNEL_OBJECTS = $(KERNEL_CFILES:.c=.o)
override KERNEL_ASMOBJECTS = $(KERNEL_ASMFILES:.S=.S.o)
override KERNEL_HEADER_DEPS = $(KERNEL_CFILES:.c=.d)

.PHONY: all
all: base/boot/hyra-kernel
		rm -f sys/include/machine
		rm -rf iso_root

.PHONY: run
run:
	$(QEMU) $(QEMU_FLAGS)

.PHONY: cross
cross:
	bash tools/cross.sh $(ARCH)

.PHONY: clean
clean:
	rm -f $(KERNEL_ASMOBJECTS) $(KERNEL_OBJECTS) $(KERNEL_HEADER_DEPS)
	rm -f sys/include/machine

sys/include/machine/:
	cd sys/include/; ln -sf arch/$(ARCH) machine

base/boot/hyra-kernel: $(KERNEL_OBJECTS) $(KERNEL_ASMOBJECTS)
	rm -rf iso_root
	mkdir -p base/boot/
	$(PROMPT) " LD " $(shell pwd)/base/boot/hyra-kernel
	$(LD) $(KERNEL_LDFLAGS) $(KERNEL_OBJECTS) $(KERNEL_ASMOBJECTS) -o base/boot/hyra-kernel
	tools/ksyms sys/kern/ksyms.c base/boot/hyra-kernel
	# === Generating symbols ===
	$(CC) -c $(KERNEL_CFLAGS) $(KERNEL_DEFINES) sys/kern/ksyms.c -o sys/kern/ksyms.o
	$(LD) $(KERNEL_LDFLAGS) $(KERNEL_OBJECTS) $(KERNEL_ASMOBJECTS) -o base/boot/hyra-kernel
	cd base/; tar cvf ../initramfs.tar * &> /dev/null
	$(PROMPT) " RAMFS " $(shell pwd)/initramfs.tar
	# === Building ISO ===
	mkdir -p iso_root/boot/
	mkdir -p iso_root/EFI/BOOT/
	cp stand/limine/BOOTX64.EFI iso_root/EFI/BOOT/
	cp conf/limine.cfg stand/limine/limine-bios.sys \
		stand/limine/limine-bios-cd.bin stand/limine/limine-uefi-cd.bin iso_root/
	cp base/boot/hyra-kernel iso_root/boot/
	mv initramfs.tar iso_root/boot/
	xorriso -as mkisofs -b limine-bios-cd.bin -no-emul-boot -boot-load-size 4\
		-boot-info-table --efi-boot limine-uefi-cd.bin -efi-boot-part \
		--efi-boot-image --protective-msdos-label iso_root -o Hyra.iso > /dev/null
	stand/limine/limine bios-install Hyra.iso
	$(PROMPT) " ISO " $(shell pwd)/Hyra.iso

-include $(KERNEL_HEADER_DEPS)
%.o: %.c sys/include/machine/
	$(PROMPT) " CC " $<
	$(CC) -c $(KERNEL_CFLAGS) $(KERNEL_DEFINES) $< -o $@

%.S.o: %.S
	$(PROMPT) " AS " $<
	$(CC) -c $< -o $@ -D__$(ARCH)__ -I sys/include/