c running

makefile

@@ -1,13 +1,26 @@
-build: src/boot.bin src/kernel_entry.bin
+build: build/os.bin
+	@echo "Build succeded"
 
-src/boot.bin: src/boot.asm
+build/boot.bin: src/boot.asm
-	nasm -o src/boot.bin src/boot.asm
+	nasm -f bin -o build/boot.bin src/boot.asm
 
-src/kernel_entry.bin: src/kernel_entry.asm
+build/kernel_entry.o: src/kernel_entry.asm
-	nasm -felf -o src/kernel_entry.bin src/kernel_entry.asm
+	nasm -f elf -o build/kernel_entry.o src/kernel_entry.asm
 
-run: src/boot.bin
+build/kernel.o: src/kernel.c
-	qemu-system-x86_64 -drive file=src/boot.bin,format=raw,index=0,media=disk
+	i386-elf-gcc -ffreestanding -m32 -c -o build/kernel.o src/kernel.c
+
+build/kernel.bin:build/kernel.o build/kernel_entry.o
+	i386-elf-ld -o build/kernel.bin -Ttext 0x1000 build/kernel_entry.o build/kernel.o --oformat binary
+
+build/zeroes.bin:
+	dd if=/dev/zero of=build/zeroes.bin bs=1 count=10240
+
+build/os.bin: build/boot.bin build/kernel.bin build/zeroes.bin
+	cat build/boot.bin build/kernel.bin build/zeroes.bin > build/os.bin
+	
+run: build/os.bin
+	qemu-system-x86_64 -drive file=build/os.bin,format=raw,index=0,media=disk
 
 clean:
-	rm src/boot.bin
+	@rm build/* 2>/dev/null || true

src/kernel.c

@@ -1,5 +1,6 @@
 int main(void)
 {
     *(char*)0xb8000 = 'A';
+    *(char*)0xb8001 = 'B';
     return 0;
 }