refactor a ton of code to be multiboot compatible

Makefile

@@ -0,0 +1,51 @@
+arch ?= x86_64
+kernel := target/$(arch)-custom/debug/libwukkOS.a
+iso := build/arch/$(arch)/wukkOS.iso
+target ?= $(arch)-custom
+final := build/arch/$(arch)/wukkOS.bin
+efi_bios := build/arch/$(arch)/OVMF-pure-efi.fd
+
+linker_script := arch/$(arch)/linker.ld
+grub_cfg := arch/$(arch)/grub.cfg
+assembly_source_files := $(wildcard arch/$(arch)/*.asm)
+assembly_object_files := $(patsubst arch/$(arch)/%.asm, \
+							build/arch/$(arch)/%.o, $(assembly_source_files))
+
+.PHONY: all clean run iso
+
+all: $(final) $(iso)
+
+clean:
+	@xargo clean
+	@rm -rf build
+
+run: $(final) $(iso)
+	@qemu-system-$(arch) -bios $(efi_bios) -cdrom $(iso) \
+-chardev stdio,id=char0,mux=on,logfile=serial.log,signal=off \
+  -serial chardev:char0 -mon chardev=char0
+
+iso: $(iso)
+
+$(iso): $(final) $(grub_cfg)
+	@cp OVMF-pure-efi.fd build/arch/$(arch)/OVMF-pure-efi.fd # TODO! remove this, it's only for testing and i don't think we can distribute it
+	@mkdir -p isodir/boot/grub
+	@cp $(final) isodir/boot/wukkOS.bin
+	@cp $(grub_cfg) isodir/boot/grub/grub.cfg
+	@grub-mkrescue -o $(iso) isodir
+	@rm -rf isodir
+
+$(final): $(kernel) $(linker_script) $(assembly_object_files)
+	@ld -n -T $(linker_script) -o $(final) $(assembly_object_files) $(kernel) \
+		--gc-sections
+
+$(kernel):
+	@RUST_TARGET_PATH=$(shell pwd) xargo build --target $(target) -Zbuild-std=core,alloc
+
+build/arch/$(arch)/%.o: arch/$(arch)/%.asm
+	@mkdir -p $(shell dirname $@)
+	@nasm -felf64 $< -o $@
+
+quick_invalidate:
+	@echo "quick invalidation"
+	@rm -rf build/arch/$(arch)
+	@rm -rf $(kernel)