clui

Clear User Interrupt Flag

CLUI

Clears the User Interrupt Flag (UIF).

Pseudocode Operation

UINTR.UIF ← 0

Encoding

Binary Layout

F3

+0

0F

+1

01

+2

EE

+3

 

Format Legacy

Opcode F3 0F 01 EE

Extension UINTR

Operands

Related

More in UINTR

Reference

View in Intel® 64 and IA-32 Architectures SDM ↗ Intel® SDM

Instruction Forms

Opcode	Instruction	Op/En	64/32-bit Mode	CPUID	Description
F3 0F 01 EE	CLUI	ZO	V/I	UINTR	Clear user interrupt flag; user interrupts blocked when user interrupt flag cleared.

Description

CLUI clears the user interrupt flag (UIF). Its effect takes place immediately: a user interrupt cannot be delivered on the instruction boundary following CLUI. An execution of CLUI inside a transactional region causes a transactional abort; the abort loads EAX as it would have had it been caused due to an execution of CLI.

Operation

UIF := 0;

Flags Affected

None.

Exceptions

Protected Mode Exceptions

#UD The CLUI instruction is not recognized in protected mode.

Real-Address Mode Exceptions

#UD The CLUI instruction is not recognized in real-address mode.

Virtual-8086 Mode Exceptions

#UD The CLUI instruction is not recognized in virtual-8086 mode.

Compatibility Mode Exceptions

#UD The CLUI instruction is not recognized in compatibility mode.

64-Bit Mode Exceptions

#UD If the LOCK prefix is used. If executed inside an enclave. If CR4.UINTR = 0. If CPUID.07H.00H:EDX.UINTR[5] = 0. CLUI-Clear User Interrupt Flag Vol. 2A 3-153