Create sub makefile for kernel

Makefile

@@ -6,35 +6,8 @@ bootloader.bin: force_look
 micro_kernel.bin: force_look
 	cd micro_kernel; $(MAKE)
 
-force_look:
-	true
-
-KERNEL_FLAGS=-masm=intel -Ikernel/include/ -O1 -std=c++11 -Wall -Wextra -fno-exceptions -fno-rtti -ffreestanding
-KERNEL_LINK_FLAGS=-std=c++11 -T linker.ld -ffreestanding -O1 -nostdlib
-
-KERNEL_O_FILES=kernel.o keyboard.o console.o kernel_utils.o timer.o shell.o
-
-kernel.o: kernel/src/kernel.cpp
-	g++ $(KERNEL_FLAGS) -c kernel/src/kernel.cpp -o kernel.o
-
-keyboard.o: kernel/src/keyboard.cpp
-	g++ $(KERNEL_FLAGS) -c kernel/src/keyboard.cpp -o keyboard.o
-
-console.o: kernel/src/console.cpp
-	g++ $(KERNEL_FLAGS) -c kernel/src/console.cpp -o console.o
-
-kernel_utils.o: kernel/src/kernel_utils.cpp
-	g++ $(KERNEL_FLAGS) -c kernel/src/kernel_utils.cpp -o kernel_utils.o
-
-timer.o: kernel/src/timer.cpp
-	g++ $(KERNEL_FLAGS) -c kernel/src/timer.cpp -o timer.o
-
-shell.o: kernel/src/shell.cpp
-	g++ $(KERNEL_FLAGS) -c kernel/src/shell.cpp -o shell.o
-
-kernel.bin: $(KERNEL_O_FILES)
-	g++ $(KERNEL_LINK_FLAGS) -o kernel.bin.o $(KERNEL_O_FILES)
-	objcopy -R .note -R .comment -S -O binary kernel.bin.o kernel.bin
+kernel.bin: force_look
+	cd kernel; $(MAKE)
 
 filler.bin: kernel.bin
 	bash fill.bash
@@ -42,7 +15,7 @@ filler.bin: kernel.bin
 thor.flp: bootloader.bin micro_kernel.bin kernel.bin filler.bin
 	cat bootloader/bootloader.bin > thor.bin
 	cat micro_kernel/micro_kernel.bin >> thor.bin
-	cat kernel.bin >> thor.bin
+	cat kernel/kernel.bin >> thor.bin
 	cat filler.bin >> thor.bin
 	dd status=noxfer conv=notrunc if=thor.bin of=thor.flp
 
@@ -52,6 +25,9 @@ qemu: thor.flp
 bochs: thor.flp
 	bochs -q -f bochsrc.txt
 
+force_look:
+	true
+
 clean:
 	rm -f *.bin
 	rm -f *.flp

fill.bash

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-size=`stat -c%s kernel.bin`
+size=`stat -c%s kernel/kernel.bin`
 let filler_size=8192-$size
 dd if=/dev/zero of=filler.bin bs=1 count=$filler_size

kernel/Makefile

@@ -0,0 +1,26 @@
+KERNEL_FLAGS=-masm=intel -Iinclude/ -O1 -std=c++11 -Wall -Wextra -fno-exceptions -fno-rtti -ffreestanding
+KERNEL_LINK_FLAGS=-std=c++11 -T linker.ld -ffreestanding -O1 -nostdlib
+
+KERNEL_O_FILES=kernel.o keyboard.o console.o kernel_utils.o timer.o shell.o
+
+kernel.bin: $(KERNEL_O_FILES)
+	g++ $(KERNEL_LINK_FLAGS) -o kernel.bin.o $(KERNEL_O_FILES)
+	objcopy -R .note -R .comment -S -O binary kernel.bin.o kernel.bin
+
+kernel.o: src/kernel.cpp
+	g++ $(KERNEL_FLAGS) -c src/kernel.cpp -o kernel.o
+
+keyboard.o: src/keyboard.cpp
+	g++ $(KERNEL_FLAGS) -c src/keyboard.cpp -o keyboard.o
+
+console.o: src/console.cpp
+	g++ $(KERNEL_FLAGS) -c src/console.cpp -o console.o
+
+kernel_utils.o: src/kernel_utils.cpp
+	g++ $(KERNEL_FLAGS) -c src/kernel_utils.cpp -o kernel_utils.o
+
+timer.o: src/timer.cpp
+	g++ $(KERNEL_FLAGS) -c src/timer.cpp -o timer.o
+
+shell.o: src/shell.cpp
+	g++ $(KERNEL_FLAGS) -c src/shell.cpp -o shell.o