Update os/Makefile: Added QEMU_ARGS

Author: wyfcyx

os/Makefile

@@ -55,21 +55,22 @@ disasm-vim: kernel
 
 run: run-inner
 
+QEMU_ARGS := -machine virt \
+			 -nographic \
+			 -bios $(BOOTLOADER) \
+			 -device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA)
+
 run-inner: build
-	@qemu-system-riscv64 \
-		-machine virt \
-		-nographic \
-		-bios $(BOOTLOADER) \
-		-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA)
+	@qemu-system-riscv64 $(QEMU_ARGS)
 
 debug: build
 	@tmux new-session -d \
-		"qemu-system-riscv64 -machine virt -nographic -bios $(BOOTLOADER) -device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA) -s -S" && \
+		"qemu-system-riscv64 $(QEMU_ARGS) -s -S" && \
 		tmux split-window -h "riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'" && \
 		tmux -2 attach-session -d
 
 gdbserver: build
-	@qemu-system-riscv64 -machine virt -nographic -bios $(BOOTLOADER) -device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA) -s -S
+	@qemu-system-riscv64 $(QEMU_ARGS) -s -S
 
 gdbclient:
 	@riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'