QEMU := qemu-system-x86_64
QEMU_FLAGS := -m 64M -smp 4

ARCH_TEMP_FILES := $(BUILD_DIR)/$(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.
$(BUILD_DIR)/$(KERNEL_EXEC).elf32: $(BUILD_DIR)/$(KERNEL_EXEC)
	@cp $(BUILD_DIR)/$(KERNEL_EXEC) $(BUILD_DIR)/$(KERNEL_EXEC).elf32
	@printf '\x03\x00' | dd of=$(BUILD_DIR)/$(KERNEL_EXEC).elf32 bs=1 seek=18 count=2 conv=notrunc 2> /dev/null

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

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

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

	@./tools/kernel-debug/debug_session.sh \
		tools/kernel-debug/gdb_session_init \
		tools/kernel-debug/lldb_session_init \
		$(QEMU) \
			-kernel $(BUILD_DIR)/$(KERNEL_EXEC).elf32 -S -s \
			-curses -serial file:$(BUILD_DIR)/socks.log $(QEMU_FLAGS)