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Vol. 2A 3-597
INSTRUCTION SET REFERENCE, A-M
MONITOR—Set Up Monitor Address
Operation
MONITOR sets up an address range for the monitor hardware using the content of
EAX as an effective address and puts the monitor hardware in armed state. Always
use memory of the write-back caching type. A store to the specified address range
will trigger the monitor hardware. The content of ECX and EDX are used to commu-
nicate other information to the monitor hardware.
Intel C/C++ Compiler Intrinsic Equivalent
MONITOR void _mm_monitor(void const *p, unsigned extensions,unsigned hints)
Numeric Exceptions
None
Protected Mode Exceptions
#GP(0) If a memory operand effective address is outside the CS, DS,
ES, FS, or GS segment limit.
If the DS, ES, FS, or GS register is used to access memory and it
contains a NULL segment selector.
If ECX ← 0.
#SS(0) If a memory operand effective address is outside the SS
segment limit.
#PF(fault-code) For a page fault.
#UD If CPUID.01H:ECX.MONITOR[bit 3] = 0.
If current privilege level is not 0.
Real Address Mode Exceptions
#GP If any part of the operand in the CS, DS, ES, FS, or GS segment
lies outside of the effective address space from 0 to FFFFH.
If ECX ← 0.
#SS If any part of the operand in the SS segment lies outside of the
effective address space from 0 to FFFFH.
#UD If CPUID.01H:ECX.MONITOR[bit 3] = 0.
Virtual 8086 Mode Exceptions
#UD The MONITOR instruction is not recognized in virtual-8086 mode
(even if CPUID.01H:ECX.MONITOR[bit 3] = 1).
Compatibility Mode Exceptions
Same exceptions as in protected mode.