Question about GPIO

I'm working on a electrical engineering question and need support to help me learn.

Please do not plagiarize.

See the details in the attachment

Although GPIO is not specifically part of this exam, we spent a significant amount of time in class discussing how to read and write memory using both C and assembly. Since our architecture uses memory mapped I/O, setting up the GPIO registers is simply reading and writing the appropriate memory locations. The following algorithm can be used for our controller to do a block GPIO write, meaning writing all port pins (15 in total) simultaneously, for any port (say PORTA)