NAME=vriscv
CC=gcc
CFLAGS=-O3 -Wall -I src
LDFLAGS=-lpthread
BUILD_DIR=build

# Risc-V toolchain
RV_LINUX_CCPREFIX=riscv32-unknown-linux-gnu-

C_FILES := $(shell find src/ -name '*.c')

all: $(BUILD_DIR)/$(NAME)

# Top-level target : vriscv
$(BUILD_DIR)/$(NAME): $(C_FILES) | $(BUILD_DIR)
	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)

# Build directory
$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

# Clean : clean built executable
.PHONY: clean
clean:
	rm -rf $(BUILD_DIR)/$(NAME)

# Distclean : clean build directory
.PHONY: distclean
distclean:
	rm -rf $(BUILD_DIR)

rungdb: all
	echo $(shell objdump -h ../riscv-pk/build/bbl | grep .payload | awk '{print $4}')

# Linux and bootloader, for running linux
$(BUILD_DIR)/linux:
	cd $(BUILD_DIR) && git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git --depth 1 -b v6.6

$(BUILD_DIR)/linux/.config: hardware/linux.config | $(BUILD_DIR)/linux
	cp hardware/linux.config $(BUILD_DIR)/linux/.config

$(BUILD_DIR)/linux/vmlinux: $(BUILD_DIR)/linux/.config | $(BUILD_DIR)/linux
	cd $(BUILD_DIR)/linux/ && make ARCH=riscv CROSS_COMPILE=$(RV_LINUX_CCPREFIX) -j7 vmlinux

$(BUILD_DIR)/riscv-pk:
	cd $(BUILD_DIR) && git clone https://github.com/riscv-software-src/riscv-pk --depth 1

$(BUILD_DIR)/riscv-pk/build: | $(BUILD_DIR)/riscv-pk
	mkdir $(BUILD_DIR)/riscv-pk/build

$(BUILD_DIR)/riscv-pk/build/bbl: $(BUILD_DIR)/linux/vmlinux hardware/vriscv.dts | $(BUILD_DIR)/riscv-pk/build
	cd $(BUILD_DIR)/riscv-pk/build && ../configure \
	--prefix=$(CURDIR)/$(BUILD_DIR)/riscv-pk/build/prefix \
	--host=riscv32-unknown-elf \
	--with-arch=rv32ima_zicsr_zifencei --with-abi=ilp32 \
	--with-dts=../../../hardware/vriscv.dts \
	--with-payload=../../linux/vmlinux
	cd $(BUILD_DIR)/riscv-pk/build && make && make install

# Run : run linux on the emulator
.PHONY: run
.SILENT: run
run: all $(BUILD_DIR)/riscv-pk/build/bbl
	./$(BUILD_DIR)/$(NAME) -m4096 $(BUILD_DIR)/riscv-pk/build/bbl

# Test : all the tests
.PHONY: tests
.SILENT: tests
tests: all
	make -C tests