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CLI.htm
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML>
<HEAD>
<TITLE>80386 Programmer's Reference Manual -- Opcode CLI</TITLE>
</HEAD>
<BODY STYLE="width:80ch">
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="CLD.htm"> CLD Clear Direction Flag</A><BR>
<B>next:</B><A HREF="CLTS.htm"> CLTS Clear Task-Switched Flag in CR0</A>
<P>
<HR>
<P>
<H1>CLI -- Clear Interrupt Flag</H1>
<PRE>
Opcode Instruction Clocks Description
FA CLI 3 Clear interrupt flag; interrupts disabled
</PRE>
<H2>Operation</H2>
<PRE>
IF := 0;
</PRE>
<H2>Description</H2>
CLI clears the interrupt flag if the current privilege level is at least as
privileged as IOPL. No other flags are affected. External interrupts are not
recognized at the end of the CLI instruction or from that point on until the
interrupt flag is set.
<H2>Flags Affected</H2>
IF := 0
<H2>Protected Mode Exceptions</H2>
#GP(0) if the current privilege level is greater (has less privilege) than
the IOPL in the flags register. IOPL specifies the least privileged level at
which I/O can be performed.
<H2>Real Address Mode Exceptions</H2>
None
<H2>Virtual 8086 Mode Exceptions</H2>
#GP(0) as for Protected Mode
<P>
<HR>
<P>
<B>up:</B> <A HREF="c17.htm">
Chapter 17 -- 80386 Instruction Set</A><BR>
<B>prev:</B><A HREF="CLD.htm"> CLD Clear Direction Flag</A><BR>
<B>next:</B><A HREF="CLTS.htm"> CLTS Clear Task-Switched Flag in CR0</A>
</BODY>