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Intel 64 and IA-32 Architectures Software Developers Manual Volume 2A, Instruction Set Reference, A-M

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INSTRUCTION SET REFERENCE, A-M
Operation
AssertLOCK#(DurationOfAccompaningInstruction);
Flags Affected
None.
Protected Mode Exceptions
#UD If the LOCK prefix is used with an instruction not listed in the
“Description” section above. Other exceptions can be generated
by the instruction that the LOCK prefix is being applied to.
Real-Address Mode Exceptions
Same exceptions as in Protected Mode.
Virtual-8086 Mode Exceptions
Same exceptions as in Protected Mode.
Compatibility Mode Exceptions
Same exceptions as in Protected Mode.
64-Bit Mode Exceptions
Same exceptions as in Protected Mode.