x86_64: cmake: add support for running qemu with debugging and stdio monitor output

arch/x86_64/QEMU.cmake

@@ -78,6 +78,16 @@ if (LLDB)
 		USES_TERMINAL
 		DEPENDS ${patched_kernel} bsp)
 
+	add_custom_target(debug-kernel-monitor
+		COMMAND
+			${QEMU}
+			-kernel ${patched_kernel}
+			-initrd ${sys_dir}/${bsp_name}
+			${generic_flags}
+			-monitor stdio -s -S
+		USES_TERMINAL
+		DEPENDS ${patched_kernel} bsp)
+
 	if (image_cdrom)
 		message(STATUS "QEMU: Enable CD-ROM debug with LLDB")
 		add_custom_target(debug-cdrom