1. Please use a while-loop to implement step 4 in Figure 5.7. How do you use the information in the status register to implement step 2? Please use a while loop to write down the pseudo-code.

FIGURE 5.7 Polling I/O Read Operation In polling 1/0 read operations, the application requests the read, and then blocks. The driver starts the device, and then continuously checks its status until the operation has completed. The driver completes the data transfer, cleans up, and then returns control to the application. -read (device, ...); Data System Interface read function write function 5 Hardware Interface Command Status Data Device Controller