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INSTRUCTION SET REFERENCE
IN—Input from Port (Continued)
Protected Mode Exceptions
#GP(0)
If the CPL is greater than (has less privilege) the I/O privilege level (IOPL)
and any of the corresponding I/O permission bits in TSS for the I/O port
being accessed is 1.
Real-Address Mode Exceptions
None.
Virtual-8086 Mode Exceptions
#GP(0)
If any of the I/O permission bits in the TSS for the I/O port being accessed
is 1.
