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### Copyright (c) 2025 Freya Murphy <freya@freyacat.org>
.PHONY: build fmt clean qemu
.SILENT:
AS ?= as
CC ?= cc
LD ?= ld
CPP ?= cpp
CPPFLAGS += -Ikernel/include
CFLAGS += -O2
CFLAGS += -std=c11
CFLAGS += -Wall -Wextra -pedantic
CFLAGS += -fno-pie -fno-stack-protector
CFLAGS += -fno-omit-frame-pointer -ffreestanding
CFLAGS += -fno-builtin
CFLAGS += -D DEBUG -g
CFLAGS += $(CPPFLAGS)
LDFLAGS += -nmagic -nostdlib
LDFLAGS += -z noexecstack
SRC=kernel
BIN=bin
KERNEL=kernel.bin
ISO=os.iso
IMAGE=disk.img
IMAGE_SIZE=4G
H_SRC = $(shell find $(SRC) -type f -name "*.h")
A_SRC = $(shell find $(SRC) -type f -name "*.S")
A_OBJ = $(patsubst %.S,$(BIN)/%.S.o,$(A_SRC))
C_SRC = $(shell find $(SRC) -type f -name "*.c")
C_OBJ = $(patsubst %.c,$(BIN)/%.o,$(C_SRC))
UNAME := $(shell uname)
QEMU = qemu-system-x86_64
QEMUOPTS = -cdrom $(BIN)/$(ISO) \
-no-reboot \
-drive format=raw,file=$(BIN)/$(IMAGE)\
-serial mon:stdio \
-m 4G \
-name kern
GRUB = grub-mkrescue
ifdef UEFI
QEMU = qemu-system-x86_64-uefi
GRUB = grub-mkrescue-uefi
endif
qemu: $(BIN)/$(ISO) $(BIN)/$(IMAGE)
$(QEMU) $(QEMUOPTS)
qemu-kvm: $(BIN)/$(ISO) $(BIN)/$(IMAGE)
$(QEMU) $(QEMUOPTS) -cpu host --enable-kvm
qemu-kvm-nox: $(BIN)/$(ISO) $(BIN)/$(IMAGE)
$(QEMU) $(QEMUOPTS) -cpu host --enable-kvm -nographic
qemu-nox: $(BIN)/$(ISO) $(BIN)/$(IMAGE)
$(QEMU) $(QEMUOPTS) -nographic
qemu-gdb: $(BIN)/$(ISO) $(BIN)/$(IMAGE)
$(QEMU) $(QEMUOPTS) -S -gdb tcp::1337
qemu-gdb-nox: $(BIN)/$(ISO) $(BIN)/$(IMAGE)
$(QEMU) $(QEMUOPTS) -nographic -S -gdb tcp::1337
gdb:
gdb -q -n -x config/gdbinit
clean:
rm -fr $(BIN)
build: $(BIN)/$(ISO)
$(A_OBJ): $(BIN)/%.S.o : %.S $(H_SRC)
mkdir -p $(@D)
printf "\033[33m AS \033[0m%s\n" $<
$(CPP) $(CPPFLAGS) -o $@.cpp $<
$(AS) -o $@ $@.cpp
$(C_OBJ): $(BIN)/%.o : %.c $(H_SRC)
mkdir -p $(@D)
printf "\033[34m CC \033[0m%s\n" $<
$(CC) -c $(CFLAGS) -o $@ $<
$(BIN)/$(KERNEL): $(C_OBJ) $(A_OBJ)
mkdir -p $(@D)
printf "\033[32m LD \033[0m%s\n" $@
$(LD) $(LDFLAGS) -T config/kernel.ld -o $(BIN)/$(KERNEL) $(A_OBJ) $(C_OBJ)
$(BIN)/$(ISO): $(BIN)/$(KERNEL)
mkdir -p $(BIN)/iso/boot/grub
cp config/grub.cfg $(BIN)/iso/boot/grub
cp $(BIN)/$(KERNEL) $(BIN)/iso/boot
$(GRUB) -o $(BIN)/$(ISO) bin/iso 2>/dev/null
$(BIN)/$(IMAGE):
make -s -C user
qemu-img create $(BIN)/$(IMAGE) $(IMAGE_SIZE)
fmt:
clang-format -i $(shell find -type f -name "*.[ch]" -and -not -path "./kernel/old/*")
sed -i 's/[ \t]*$$//' $(shell find -type f -name "*.[chS]" -and -not -path "./kernel/old/*")
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