{"label":"DIT: Data Independent Timing","content":"<html>
 <head></head> 
 <body> 
  <h2>DIT, Data Independent Timing</h2> 
  <p>The DIT characteristics are:</p> 
  <h2>Purpose</h2> 
  <p>Allows access to the Data Independent Timing bit.</p> 
  <h2>Configuration</h2> 
  <p>This register is present only when FEAT_DIT is implemented. Otherwise, direct accesses to DIT are <small>UNDEFINED</small>.</p> 
  <h2>Attributes</h2> 
  <p>DIT is a 64-bit register.</p> 
  <h2>Field descriptions</h2> 
  <table> 
   <thead> 
    <tr> 
     <td>63</td> 
     <td>62</td> 
     <td>61</td> 
     <td>60</td> 
     <td>59</td> 
     <td>58</td> 
     <td>57</td> 
     <td>56</td> 
     <td>55</td> 
     <td>54</td> 
     <td>53</td> 
     <td>52</td> 
     <td>51</td> 
     <td>50</td> 
     <td>49</td> 
     <td>48</td> 
     <td>47</td> 
     <td>46</td> 
     <td>45</td> 
     <td>44</td> 
     <td>43</td> 
     <td>42</td> 
     <td>41</td> 
     <td>40</td> 
     <td>39</td> 
     <td>38</td> 
     <td>37</td> 
     <td>36</td> 
     <td>35</td> 
     <td>34</td> 
     <td>33</td> 
     <td>32</td> 
    </tr> 
   </thead> 
   <tfoot> 
    <tr> 
     <td>31</td> 
     <td>30</td> 
     <td>29</td> 
     <td>28</td> 
     <td>27</td> 
     <td>26</td> 
     <td>25</td> 
     <td>24</td> 
     <td>23</td> 
     <td>22</td> 
     <td>21</td> 
     <td>20</td> 
     <td>19</td> 
     <td>18</td> 
     <td>17</td> 
     <td>16</td> 
     <td>15</td> 
     <td>14</td> 
     <td>13</td> 
     <td>12</td> 
     <td>11</td> 
     <td>10</td> 
     <td>9</td> 
     <td>8</td> 
     <td>7</td> 
     <td>6</td> 
     <td>5</td> 
     <td>4</td> 
     <td>3</td> 
     <td>2</td> 
     <td>1</td> 
     <td>0</td> 
    </tr> 
   </tfoot> 
   <tbody> 
    <tr> 
     <td colspan="32"><a href="/documentation/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-63_25" class="document-topic" document-topic-path="/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-63_25">RES0</a></td> 
    </tr> 
    <tr> 
     <td colspan="7"><a href="/documentation/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-63_25" class="document-topic" document-topic-path="/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-63_25">RES0</a></td> 
     <td colspan="1"><a href="/documentation/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-24_24" class="document-topic" document-topic-path="/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-24_24">DIT</a></td> 
     <td colspan="24"><a href="/documentation/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-23_0" class="document-topic" document-topic-path="/ddi0601/2023-12/AArch64-Registers/DIT--Data-Independent-Timing?lang=en#fieldset_0-23_0">RES0</a></td> 
    </tr> 
   </tbody> 
  </table> 
  <h4 id="fieldset_0-63_25">Bits [63:25]</h4> 
  <div> 
   <p>Reserved, <small>RES0</small>.</p> 
  </div> 
  <h4 id="fieldset_0-24_24">DIT, bit [24]</h4> 
  <div> 
   <p>Data Independent Timing.</p> 
   <table> 
    <tbody> 
     <tr> 
      <th>DIT</th> 
      <th>Meaning</th> 
     </tr> 
     <tr> 
      <td>0b0</td> 
      <td> <p>The architecture makes no statement about the timing properties of any instructions.</p> </td> 
     </tr> 
     <tr> 
      <td>0b1</td> 
      <td><p>The architecture requires that:</p> 
       <ul> 
        <li> <p>The timing of every load and store instruction is insensitive to the value of the data being loaded or stored.</p> </li> 
        <li> <p>For certain data processing instructions, the instruction takes a time which is independent of:</p> 
         <ul> 
          <li> <p>The values of the data supplied in any of its registers.</p> </li> 
          <li> <p>The values of the NZCV flags.</p> </li> 
         </ul> </li> 
        <li> <p>For certain data processing instructions, the response of the instruction to asynchronous exceptions does not vary based on:</p> 
         <ul> 
          <li> <p>The values of the data supplied in any of its registers.</p> </li> 
          <li> <p>The values of the NZCV flags.</p> </li> 
         </ul> </li> 
       </ul></td> 
     </tr> 
    </tbody> 
   </table> 
   <p>The Operational Information section of a data processing instruction description indicates if that instruction is affected by this bit.</p> 
   <blockquote title="Note info"> 
    <p>The architecture makes no statement about the timing properties when the PSTATE.DIT bit is not set. However, it is likely that many of these instructions have timing that is invariant of the data in many situations.</p> 
    <p>In particular, Arm strongly recommends that the Armv8.3 pointer authentication instructions do not have their timing dependent on the key value used in the pointer authentication in all cases, regardless of the PSTATE.DIT bit.</p> 
   </blockquote> 
   <p>The reset behavior of this field is:</p> 
   <ul> 
    <li>On a Warm reset, this field resets to <code>0</code>. </li> 
   </ul> 
  </div> 
  <h4 id="fieldset_0-23_0">Bits [23:0]</h4> 
  <div> 
   <p>Reserved, <small>RES0</small>.</p> 
  </div> 
  <div> 
   <h2>Accessing DIT</h2> 
   <p>Accesses to this register use the following encodings in the System register encoding space:</p> 
   <h4><code>MRS &lt;Xt&gt;, DIT</code></h4> 
   <table> 
    <tbody> 
     <tr> 
      <th>op0</th> 
      <th>op1</th> 
      <th>CRn</th> 
      <th>CRm</th> 
      <th>op2</th> 
     </tr> 
     <tr> 
      <td>0b11</td> 
      <td>0b011</td> 
      <td>0b0100</td> 
      <td>0b0010</td> 
      <td>0b101</td> 
     </tr> 
    </tbody> 
   </table> 
   <pre>if PSTATE.EL == EL0 then
    X[t, 64] = Zeros(39):PSTATE.DIT:Zeros(24);
elsif PSTATE.EL == EL1 then
    X[t, 64] = Zeros(39):PSTATE.DIT:Zeros(24);
elsif PSTATE.EL == EL2 then
    X[t, 64] = Zeros(39):PSTATE.DIT:Zeros(24);
elsif PSTATE.EL == EL3 then
    X[t, 64] = Zeros(39):PSTATE.DIT:Zeros(24);
                </pre> 
   <h4><code>MSR DIT, &lt;Xt&gt;</code></h4> 
   <table> 
    <tbody> 
     <tr> 
      <th>op0</th> 
      <th>op1</th> 
      <th>CRn</th> 
      <th>CRm</th> 
      <th>op2</th> 
     </tr> 
     <tr> 
      <td>0b11</td> 
      <td>0b011</td> 
      <td>0b0100</td> 
      <td>0b0010</td> 
      <td>0b101</td> 
     </tr> 
    </tbody> 
   </table> 
   <pre>if PSTATE.EL == EL0 then
    PSTATE.DIT = X[t, 64]&lt;24&gt;;
elsif PSTATE.EL == EL1 then
    PSTATE.DIT = X[t, 64]&lt;24&gt;;
elsif PSTATE.EL == EL2 then
    PSTATE.DIT = X[t, 64]&lt;24&gt;;
elsif PSTATE.EL == EL3 then
    PSTATE.DIT = X[t, 64]&lt;24&gt;;
                </pre> 
   <h4><code>MSR DIT, #&lt;imm&gt;</code></h4> 
   <table> 
    <tbody> 
     <tr> 
      <th>op0</th> 
      <th>op1</th> 
      <th>CRn</th> 
      <th>op2</th> 
     </tr> 
     <tr> 
      <td>0b00</td> 
      <td>0b011</td> 
      <td>0b0100</td> 
      <td>0b010</td> 
     </tr> 
    </tbody> 
   </table> 
  </div>  
 </body>
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