Quiz submission record for quiz6-2-2 at Thu Jul 29 10:50:47 2004:

Your Answer for Question 1:
EPC contains the address of the instruction that cuased exception.
Cause holds exception type and pending interrupt bits.

mfc0 $k0, $13 (move Cause into $k0)
mfc0 $k1, $14 (move EPC into $k1)

Your Answer for Question 2:
exceptions in pipelined computers that are associated with the exact instruction that was the cause of the interrupt or exception.

Your Answer for Question 3:
The disadvantage is that it can waste a lot of processor time because processors are much faster than I/O devices

Your Answer for Question 4:
Memory-mapped io means that portions of the address space are assigned to io devices.  Reads and writes to those addresses are interpreted as commands to the io devices.

loop:
li $t0, 32'b11
lw $t0, 0xffff0000
li $t1, 0x8
lw $t1, 0xffff0004
li $t0, 32'b11
lw $t0, 0xffff0008
li $t1, 0x8
lw $t1, 0xffff000c
j loop


Your unique submission ID is quiz6-2-2-cs61c-eb-1091123447-1355.