ARCH ?= riscv64
MODE ?= debug

ifeq ($(ARCH), riscv64)
	BUILD_TARGET := riscv64imac-unknown-none-elf
	LINKER_LDS   := kernel/src/arch/riscv/linker64.ld
else
	$(error Invalid TARGET: $(ARCH))
endif

ifeq ($(MODE), release)
	CARGO_BUILD_ARGS += --release
else ifneq ($(MODE), debug)
	$(error Invalid MODE: $(MODE))
endif

RUSTFLAGS += -Crelocation-model=static
RUSTFLAGS += -Ccode-model=medium
#RUSTFLAGS += -Ctarget-feature=+relax
RUSTFLAGS += -Cforce-frame-pointers=yes
RUSTFLAGS += -Clink-arg=-T$(LINKER_LDS)

CARGO_TARGET_ARGS := --target=$(BUILD_TARGET)

CARGO_BUILD_ARGS += -Zbuild-std=core,compiler_builtins,alloc
CARGO_BUILD_ARGS += -Zbuild-std-features=compiler-builtins-mem
CARGO_BUILD_ARGS += $(CARGO_TARGET_ARGS)

QEMU = qemu-system-$(ARCH)

QEMU_ARGS  = -nographic -serial mon:stdio -smp 1
QEMU_ARGS += -machine virt # TODO: override by $(BOARD)
QEMU_ARGS += -kernel target/$(BUILD_TARGET)/$(MODE)/kernel
QEMU_ARGS += -initrd build/init.cpio

kernel:
	env RUSTFLAGS="$(RUSTFLAGS)" cargo build --bin kernel $(CARGO_BUILD_ARGS)

clippy:
	cargo clippy -p allocator
	cargo clippy -p utils
	cargo clippy --no-deps $(CARGO_TARGET_ARGS) --manifest-path=kernel/Cargo.toml

test:
	cargo test -p allocator
	cargo test -p utils
	env RUSTFLAGS="$(RUSTFLAGS)" cargo test $(CARGO_TARGET_ARGS) --bin=kernel

kernel-test-dump:
	@env RUSTFLAGS="$(RUSTFLAGS)" cargo test $(CARGO_TARGET_ARGS) --bin=kernel --no-run --message-format=json

kernel-asm: kernel
	riscv64-elf-objdump -d target/$(BUILD_TARGET)/$(MODE)/kernel | c++filt -t > kernel.asm

build-target:
	@echo $(BUILD_TARGET)

clean:
	cargo clean

qemu: kernel
	$(QEMU) $(QEMU_ARGS)

qemu-gdb: kernel
	$(QEMU) $(QEMU_ARGS) -s -S

.PHONY: kernel clippy test kernel-test-dump kernel-asm build-target clean qemu qemu-gdb