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docs: Add SDEI dispatcher documentation    
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stroke-width: 1.5;" width="87" x="16" y="635.0313"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="73" x="23" y="655.0264">SDEI client</text><rect fill="#FEFECE" filter="url(#fvds2ijrtbp5u)" height="30.2969" style="stroke: #A80036; stroke-width: 1.5;" width="39" x="359" y="3"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="25" x="366" y="22.9951">EL3</text><rect fill="#FEFECE" filter="url(#fvds2ijrtbp5u)" height="30.2969" style="stroke: #A80036; stroke-width: 1.5;" width="39" x="359" y="635.0313"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="25" x="366" y="655.0264">EL3</text><rect fill="#FEFECE" filter="url(#fvds2ijrtbp5u)" height="30.2969" style="stroke: #A80036; stroke-width: 1.5;" width="161" x="436" y="3"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="147" x="443" y="22.9951">SDEI interrupt source</text><rect fill="#FEFECE" filter="url(#fvds2ijrtbp5u)" height="30.2969" style="stroke: #A80036; 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stroke-width: 1.0;" width="10" x="56.5" y="626.0313"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="56.5" x2="56.5" y1="626.0313" y2="627.0313"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="66.5" x2="66.5" y1="626.0313" y2="627.0313"/><rect fill="#FA8072" filter="url(#fvds2ijrtbp5u)" height="68.2656" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="61.5" y="411.4297"/><rect fill="#FF0000" filter="url(#fvds2ijrtbp5u)" height="233.9297" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="375.5" y="343.1641"/><rect fill="#FA8072" filter="url(#fvds2ijrtbp5u)" height="204.7969" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="513.5" y="343.1641"/><polygon fill="#A80036" points="368.5,65.2969,378.5,69.2969,368.5,73.2969,372.5,69.2969" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="66.5" x2="374.5" y1="69.2969" y2="69.2969"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="73.5" y="64.3638">[1]</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="163" x="98.5" y="64.3638">SDEI_INTERRUPT_BIND</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="26" x="261.5" y="64.3638">(irq)</text><polygon fill="#A80036" points="77.5,94.4297,67.5,98.4297,77.5,102.4297,73.5,98.4297" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="71.5" x2="379.5" y1="98.4297" y2="98.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="83.5" y="93.4966">[2]</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="113" x="108.5" y="93.4966">event number: ev</text><polygon fill="#A80036" points="368.5,123.5625,378.5,127.5625,368.5,131.5625,372.5,127.5625" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="66.5" x2="374.5" y1="127.5625" y2="127.5625"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="73.5" y="122.6294">[3]</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="164" x="98.5" y="122.6294">SDEI_EVENT_REGISTER</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="101" x="262.5" y="122.6294">(ev, handler, ...)</text><polygon fill="#A80036" points="77.5,152.6953,67.5,156.6953,77.5,160.6953,73.5,156.6953" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="71.5" x2="379.5" y1="156.6953" y2="156.6953"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="83.5" y="151.7622">[4]</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="51" x="108.5" y="151.7622">success</text><polygon fill="#A80036" points="368.5,181.8281,378.5,185.8281,368.5,189.8281,372.5,185.8281" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="66.5" x2="374.5" y1="185.8281" y2="185.8281"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="73.5" y="180.895">[5]</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="151" x="98.5" y="180.895">SDEI_EVENT_ENABLE</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="25" x="249.5" y="180.895">(ev)</text><polygon fill="#A80036" points="77.5,210.9609,67.5,214.9609,77.5,218.9609,73.5,214.9609" style="stroke: #A80036; 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stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="71.5" x2="379.5" y1="273.2266" y2="273.2266"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="83.5" y="268.2935">[8]</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="8" x="108.5" y="268.2935">1</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="142" x="219" y="305.5698">&lt;&lt;Business as usual&gt;&gt;</text><polygon fill="#A80036" points="396.5,339.1641,386.5,343.1641,396.5,347.1641,392.5,343.1641" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="390.5" x2="512.5" y1="343.1641" y2="343.1641"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="21" x="402.5" y="338.231">[9]</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="89" x="427.5" y="338.231">SDEI interrupt</text><polygon fill="#FBFB77" filter="url(#fvds2ijrtbp5u)" points="297,356.2969,297,381.2969,460,381.2969,460,366.2969,450,356.2969,297,356.2969" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="450" x2="450" y1="356.2969" y2="366.2969"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="460" x2="450" y1="366.2969" y2="366.2969"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="142" x="303" y="373.3638">Prepare SDEI dispatch</text><polygon fill="#A80036" points="82.5,407.4297,72.5,411.4297,82.5,415.4297,78.5,411.4297" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="76.5" x2="374.5" y1="411.4297" y2="411.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="30" x="88.5" y="406.4966">[10]</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="54" x="122.5" y="406.4966">dispatch</text><polygon fill="#FBFB77" filter="url(#fvds2ijrtbp5u)" points="8,424.5625,8,449.5625,111,449.5625,111,434.5625,101,424.5625,8,424.5625" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="101" x2="101" y1="424.5625" y2="434.5625"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="111" x2="101" y1="434.5625" y2="434.5625"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="82" x="14" y="441.6294">SDEI handler</text><polygon fill="#A80036" points="363.5,475.6953,373.5,479.6953,363.5,483.6953,367.5,479.6953" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="66.5" x2="369.5" y1="479.6953" y2="479.6953"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="30" x="73.5" y="474.7622">[11]</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="184" x="107.5" y="474.7622">SDEI_EVENT_COMPLETE()</text><polygon fill="#FBFB77" filter="url(#fvds2ijrtbp5u)" points="291,492.8281,291,517.8281,466,517.8281,466,502.8281,456,492.8281,291,492.8281" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="456" x2="456" y1="492.8281" y2="502.8281"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="466" x2="456" y1="502.8281" y2="502.8281"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="154" x="297" y="509.895">Complete SDEI dispatch</text><polygon fill="#A80036" points="506.5,543.9609,516.5,547.9609,506.5,551.9609,510.5,547.9609" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="385.5" x2="512.5" y1="547.9609" y2="547.9609"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="30" x="392.5" y="543.0278">[12]</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="21" x="426.5" y="543.0278">EOI</text><polygon fill="#A80036" points="77.5,573.0938,67.5,577.0938,77.5,581.0938,73.5,577.0938" style="stroke: #A80036; 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