4. (4 points) Write a MIPS device driver for reading in the X- and Y-co-ordinates of a mouse, which are available in at locations labeled mouse I and mouse.Y, respectively. Each of the co-ordinates is a 32-bit word. The read X- and Y-co-ordinates should be placed in registers $vo and Sv1, respectively. It is unwise to read the co-ordinates while the mouse is not ready; if the mouse is ready, then the most significant bit of its 8-bit status register, labeled mouse.status, is set to 1. After reading it, the device driver should reset that bit. It is unwie to read the orontiats