Update Makefile

This Makefile is for i686-elf cross compilation  only

bootloader/Makefile

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