forked from NRZCode/ia32-64
93 lines
3.6 KiB
HTML
93 lines
3.6 KiB
HTML
<!DOCTYPE html>
|
||
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:svg="http://www.w3.org/2000/svg" xmlns:x86="http://www.felixcloutier.com/x86"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><link rel="stylesheet" type="text/css" href="style.css"></link><title>TESTUI
|
||
— Determine User Interrupt Flag</title></head><body><header><nav><ul><li><a href='index.html'>Index</a></li><li>December 2023</li></ul></nav></header><h1>TESTUI
|
||
— Determine User Interrupt Flag</h1>
|
||
|
||
<table>
|
||
<tr>
|
||
<th>Opcode/Instruction</th>
|
||
<th>Op/En</th>
|
||
<th>64/32 bit Mode Support</th>
|
||
<th>CPUID Feature Flag</th>
|
||
<th>Description</th></tr>
|
||
<tr>
|
||
<td>F3 0F 01 ED TESTUI</td>
|
||
<td>ZO</td>
|
||
<td>V/I</td>
|
||
<td>UINTR</td>
|
||
<td>Copies the current value of UIF into EFLAGS.CF.</td></tr></table>
|
||
<h2 id="instruction-operand-encoding">Instruction Operand Encoding<a class="anchor" href="#instruction-operand-encoding">
|
||
¶
|
||
</a></h2>
|
||
<table>
|
||
<tr>
|
||
<th>Op/En</th>
|
||
<th>Tuple</th>
|
||
<th>Operand 1</th>
|
||
<th>Operand 2</th>
|
||
<th>Operand 3</th>
|
||
<th>Operand 4</th></tr>
|
||
<tr>
|
||
<td>ZO</td>
|
||
<td>N/A</td>
|
||
<td>N/A</td>
|
||
<td>N/A</td>
|
||
<td>N/A</td>
|
||
<td>N/A</td></tr></table>
|
||
<p>TESTUI copies the current value of the user interrupt flag (UIF) into EFLAGS.CF. This instruction can be executed regardless of CPL.</p>
|
||
<p>TESTUI may be executed normally inside a transactional region.</p>
|
||
<h2 id="operation">Operation<a class="anchor" href="#operation">
|
||
¶
|
||
</a></h2>
|
||
<pre>CF := UIF;
|
||
ZF := AF := OF := PF := SF := 0;
|
||
</pre>
|
||
<h2 id="flags-affected">Flags Affected<a class="anchor" href="#flags-affected">
|
||
¶
|
||
</a></h2>
|
||
<p>The ZF, OF, AF, PF, SF flags are cleared and the CF flags to the value of the user interrupt flag.</p>
|
||
<h2 class="exceptions" id="protected-mode-exceptions">Protected Mode Exceptions<a class="anchor" href="#protected-mode-exceptions">
|
||
¶
|
||
</a></h2>
|
||
<table>
|
||
<tr>
|
||
<td>#UD</td>
|
||
<td>The TESTUI instruction is not recognized in protected mode.</td></tr></table>
|
||
<h2 class="exceptions" id="real-address-mode-exceptions">Real-Address Mode Exceptions<a class="anchor" href="#real-address-mode-exceptions">
|
||
¶
|
||
</a></h2>
|
||
<table>
|
||
<tr>
|
||
<td>#UD</td>
|
||
<td>The TESTUI instruction is not recognized in real-address mode.</td></tr></table>
|
||
<h2 class="exceptions" id="virtual-8086-mode-exceptions">Virtual-8086 Mode Exceptions<a class="anchor" href="#virtual-8086-mode-exceptions">
|
||
¶
|
||
</a></h2>
|
||
<table>
|
||
<tr>
|
||
<td>#UD</td>
|
||
<td>The TESTUI instruction is not recognized in virtual-8086 mode.</td></tr></table>
|
||
<h2 class="exceptions" id="compatibility-mode-exceptions">Compatibility Mode Exceptions<a class="anchor" href="#compatibility-mode-exceptions">
|
||
¶
|
||
</a></h2>
|
||
<table>
|
||
<tr>
|
||
<td>#UD</td>
|
||
<td>The TESTUI instruction is not recognized in compatibility mode.</td></tr></table>
|
||
<h2 class="exceptions" id="64-bit-mode-exceptions">64-Bit Mode Exceptions<a class="anchor" href="#64-bit-mode-exceptions">
|
||
¶
|
||
</a></h2>
|
||
<table>
|
||
<tr>
|
||
<td rowspan="4">#UD</td>
|
||
<td>If the LOCK prefix is used.</td></tr>
|
||
<tr>
|
||
<td>If executed inside an enclave.</td></tr>
|
||
<tr>
|
||
<td>If CR4.UINTR = 0.</td></tr>
|
||
<tr>
|
||
<td>If CPUID.07H.0H:EDX.UINTR[bit 5] = 0.</td></tr></table><footer><p>
|
||
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be
|
||
inc<span style="opacity: 0.2">omp</span>lete or b<sub>r</sub>oke<sub>n</sub> in various obvious or non-obvious
|
||
ways. Refer to <a href="https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4">Intel® 64 and IA-32 Architectures Software Developer’s Manual</a> for anything serious.
|
||
</p></footer></body></html>
|