Fixed paging fully now. Kernel is loaded with virtual memory enabled. Just need to write an allocator and make kernel use virtual memory addresses for its stuff. Restructured codebase to be less messy. Updated Makefile to put binary files under build/ rather than in root directory

Makefile

@@ -1,45 +1,49 @@
 CFLAGS = -m32 -mgeneral-regs-only -nostdlib -fno-builtin -fno-exceptions -fno-leading-underscore -fno-pie -fno-stack-protector -Wno-pointer-to-int-cast
 LDFLAGS = 
 
-DISK_IMG_FILES = kernel.bin
-KERNEL32_OBJS = screenstuff.o io.o idt.o keyboard.o strings.o atapio.o c_code_entry.o kernel.o paging.o
+DISK_IMG_FILES = build/kernel/kernel.bin
+KERNEL_OBJS = build/c_code_entry.o build/kernel/screenstuff.o build/kernel/io.o build/kernel/idt.o build/kernel/keyboard.o build/kernel/strings.o build/kernel/atapio.o build/kernel/kernel.o build/kernel/paging.o
+STAGE2_OBS = build/c_code_entry.o build/boot_stage2/io.o build/boot_stage2/atapio.o build/boot_stage2/strings.o build/boot_stage2/screenstuff.o build/boot_stage2/stage2.o build/boot_stage2/paging.o
 
 run: disk.img
 	qemu-system-x86_64 disk.img
 
-disk.img: clean boot.sector boot.stage2 $(DISK_IMG_FILES)
+disk.img: clean prepare build/boot/boot.bin build/boot_stage2/boot.bin $(DISK_IMG_FILES)
 	dd if=/dev/zero of=disk.img count=43 bs=100k
-	dd if=boot.sector of=disk.img conv=notrunc
-	dd obs=512 seek=1 if=boot.stage2 of=disk.img conv=notrunc
+	dd if=build/boot/boot.bin of=disk.img conv=notrunc
+	dd obs=512 seek=1 if=build/boot_stage2/boot.bin of=disk.img conv=notrunc
 	mount disk.img img.d
-	cp *.bin img.d/
+	cp $(DISK_IMG_FILES) img.d/
 	cp hello.txt img.d/
 	umount img.d
 	chmod 777 disk.img
 
-clean:
-	rm $(DISK_IMG_FILES) $(KERNEL32_OBJS) boot.sector disk.img || true
+prepare:
+	mkdir -p img.d
+	mkdir -p build/boot
+	mkdir -p build/boot_stage2
+	mkdir -p build/kernel
 
-boot.sector: boot.asm
+clean:
+	rm -rf build
+
+build/boot/boot.bin: src/boot/boot.asm
 	nasm $< -o $@
 
-boot.stage2: boot_stage2.ld boot.stage2.o
-	ld $(LDFLAGS) -T $< boot.stage2.o
+build/boot_stage2/boot.bin: src/boot_stage2/boot_stage2.ld $(STAGE2_OBS)
+	ld $(LDFLAGS) -T $< $(STAGE2_OBS)
 
-boot.stage2.o: src/boot_stage2/main.c io.o atapio.o strings.o c_code_entry.o screenstuff.o paging.o
+build/kernel/kernel.bin: src/kernel/kernel.ld $(KERNEL_OBJS)
+	ld $(LDFLAGS) -T $< $(KERNEL_OBJS)
+
+build/boot_stage2/stage2.o: src/boot_stage2/main.c 
 	gcc $(CFLAGS) -o $@ -c $<
 
-%.bin: %.asm
-	nasm $< -o $@
+build/kernel/%.o: src/kernel/%.c
+	gcc $(CFLAGS) -o $@ -c $<
 
-kernel.bin: kernel.ld $(KERNEL32_OBJS)
-	ld $(LDFLAGS) -T $< $(KERNEL32_OBJS)
+build/boot_stage2/%.o: src/boot_stage2/%.c
+	gcc $(CFLAGS) -o $@ -c $<
 
-%.o: src/kernel/%.asm
-	nasm -felf32 $< -o $@
-
-%.o: src/%.asm
-	nasm -felf32 $< -o $@
-
-%.o: src/kernel/%.c
-	gcc $(CFLAGS) -o $@ -c $<
+build/%.o: src/%.asm
+	nasm -felf32 $< -o $@