mirror of
https://github.com/gbowne1/ClassicOS.git
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126 lines
4.5 KiB
Makefile
126 lines
4.5 KiB
Makefile
# Makefile – ClassicOS
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# ------------------------------------------------------------
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# Targets:
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# all → build the final floppy image (os.img)
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# run → build + launch in QEMU
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# clean → remove all generated files
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# ------------------------------------------------------------
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# Tools
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NASM := nasm
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GCC := i686-elf-gcc
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LD := i686-elf-ld
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OBJCOPY := i686-elf-objcopy
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QEMU := qemu-system-i386
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DD := dd
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MKDIR := mkdir -p
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RM := rm -rf
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# Directories
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BOOTDIR := bootloader
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KERNDIR := kernel
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OBJDIR := obj
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IMGDIR := img
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# ----------------------------------------------------------------
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# Bootloader sources
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# ----------------------------------------------------------------
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BOOT_ASM := $(BOOTDIR)/boot.asm $(BOOTDIR)/boot1.asm
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BOOT_OBJ := $(OBJDIR)/boot.o $(OBJDIR)/boot1.o
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# ----------------------------------------------------------------
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# Kernel sources (C + asm)
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# ----------------------------------------------------------------
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KERN_C := $(wildcard $(KERNDIR)/*.c)
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KERN_ASM := $(wildcard $(KERNDIR)/*.asm)
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KERN_OBJ := $(patsubst $(KERNDIR)/%.c,$(OBJDIR)/%.o,$(KERN_C)) \
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$(patsubst $(KERNDIR)/%.asm,$(OBJDIR)/%.o,$(KERN_ASM))
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# ----------------------------------------------------------------
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# Flags
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# ----------------------------------------------------------------
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NASMFLAGS := -f elf32
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CFLAGS := -std=gnu99 -ffreestanding -Wall -Wextra \
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-nostdinc -nostdlib -fno-builtin -fno-stack-protector \
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-m32 -I$(KERNDIR)
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LDFLAGS := -T $(BOOTDIR)/linker.ld -m elf_i386 -nostdlib
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# ----------------------------------------------------------------
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# Final artefacts
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# ----------------------------------------------------------------
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IMG := $(IMGDIR)/os.img
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KERNEL_BIN := $(OBJDIR)/kernel.bin
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BOOT_BIN := $(OBJDIR)/boot.bin
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BOOT1_BIN := $(OBJDIR)/boot1.bin
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# ----------------------------------------------------------------
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# Phony targets
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# ----------------------------------------------------------------
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.PHONY: all clean run dirs
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# ----------------------------------------------------------------
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# Default
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# ----------------------------------------------------------------
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all: dirs $(IMG)
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# ----------------------------------------------------------------
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# Create needed directories
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# ----------------------------------------------------------------
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dirs:
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$(MKDIR) $(OBJDIR) $(IMGDIR)
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# ----------------------------------------------------------------
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# 1. First-stage bootloader (512 bytes, raw binary)
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# ----------------------------------------------------------------
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$(OBJDIR)/boot.o: $(BOOTDIR)/boot.asm
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$(NASM) -f bin -o $@ $<
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# ----------------------------------------------------------------
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# 2. Second-stage bootloader (ELF → raw binary)
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# ----------------------------------------------------------------
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$(OBJDIR)/boot1.o: $(BOOTDIR)/boot1.asm
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$(NASM) $(NASMFLAGS) -o $@ $<
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$(BOOT1_BIN): $(OBJDIR)/boot1.o
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$(LD) -Ttext=0x7E00 --oformat binary -o $@ $<
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# ----------------------------------------------------------------
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# 3. Kernel (C + asm → ELF → raw binary)
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# ----------------------------------------------------------------
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$(OBJDIR)/%.o: $(KERNDIR)/%.c
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$(GCC) $(CFLAGS) -c -o $@ $<
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$(OBJDIR)/%.o: $(KERNDIR)/%.asm
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$(NASM) $(NASMFLAGS) -o $@ $<
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$(OBJDIR)/kernel.elf: $(KERN_OBJ)
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$(LD) $(LDFLAGS) -o $@ $^
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$(KERNEL_BIN): $(OBJDIR)/kernel.elf
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$(OBJCOPY) -O binary $@ $<
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# ----------------------------------------------------------------
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# 4. Build the final floppy image
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# • 2880 sectors (1.44 MiB floppy)
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# • sector 0 → boot (MBR)
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# • sector 1–4 → boot1 (4 × 512 = 2 KB)
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# • sector 5–20 → kernel (16 sectors = 8 KB)
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# ----------------------------------------------------------------
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$(IMG): $(OBJDIR)/boot.o $(BOOT1_BIN) $(KERNEL_BIN)
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$(DD) if=/dev/zero of=$@ bs=512 count=2880
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$(DD) if=$(OBJDIR)/boot.o of=$@ conv=notrunc bs=512 count=1
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$(DD) if=$(BOOT1_BIN) of=$@ conv=notrunc bs=512 seek=1 count=4
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$(DD) if=$(KERNEL_BIN) of=$@ conv=notrunc bs=512 seek=5 count=16
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# ----------------------------------------------------------------
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# Run in QEMU
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# ----------------------------------------------------------------
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run: all
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$(QEMU) -fda $(IMG) -boot a
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# ----------------------------------------------------------------
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# Clean
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# ----------------------------------------------------------------
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clean:
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$(RM) $(OBJDIR) $(IMGDIR)
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