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Vol. 2A 3-463
INSTRUCTION SET REFERENCE, A-M
IN—Input from Port
DEST ← SRC; (* Read from selected I/O port *)
FI;
ELSE (Real Mode or Protected Mode with CPL ≤ IOPL *)
DEST ← SRC; (* Read from selected I/O port *)
FI;
Flags Affected
None.
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.
#UD If the LOCK prefix is used.
Real-Address Mode Exceptions
#UD If the LOCK prefix is used.
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.
#PF(fault-code) If a page fault occurs.
#UD If the LOCK prefix is used.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit 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.
#UD If the LOCK prefix is used.