QEMU := qemu-system-x86_64

ARCH_TEMP_FILES := $(BUILDDIR)/$(KERNEL_EXEC).elf32

# qemu refuses to boot ELF64 binaries. this creates a patched version of the kernel
# binary to trick qemu into thinking its an ELF32.
# this has no effect on the kernel itself; the x86_64 kernel's
# entry point is 32-bit machine code.
$(BUILDDIR)/$(KERNEL_EXEC).elf32: $(BUILDDIR)/$(KERNEL_EXEC)
	@cp $(BUILDDIR)/$(KERNEL_EXEC) $(BUILDDIR)/$(KERNEL_EXEC).elf32
	@printf '\x03\x00' | dd of=$(BUILDDIR)/$(KERNEL_EXEC).elf32 bs=1 seek=18 count=2 conv=notrunc 2> /dev/null

run: $(BUILDDIR)/$(KERNEL_EXEC) $(BUILDDIR)/$(KERNEL_EXEC).elf32
	@echo "    \033[1;93mBOOT\033[0m   $<"

	@$(QEMU) -kernel $(BUILDDIR)/$(KERNEL_EXEC).elf32

debug: $(BUILDDIR)/$(KERNEL_EXEC) $(BUILDDIR)/$(KERNEL_EXEC).elf32
	@echo "    \033[1;93mBOOT\033[0m   $<"

	@$(QEMU) \
		-kernel $(BUILDDIR)/$(KERNEL_EXEC).elf32 -S -s \
		-monitor stdio