1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<html> 3 4<head> 5<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 6<META name="GENERATOR" content="Microsoft FrontPage 5.0"> 7<META http-equiv="Content-Style-Type" content="text/css"> 8<LINK rel="stylesheet" type="text/css" href="../../CSS/revolution.css"> 9<title>PPCSync</title> 10</head> 11 12<body> 13 14<h1>PPCSync</h1> 15 16<h2>Syntax</h2> 17<dl><dd><pre class="construction"> 18#include <revolution/base/PPCArch.h> 19 20void PPCSync ( void ); 21</pre></dd></dl> 22 23<h2>Arguments</h2> 24<p>None.</p> 25 26<h2>Return Values</h2> 27<p>None.</p> 28 29<H2>Description</H2> 30<P>The <CODE>PPCSync</CODE> function essentially executes a standard PowerPC <code>sync</code> instruction. However, under the Revolution system, several special steps are required to use sync. This function capsulizes these steps.</P> 31<P>The <CODE>PPCSync</CODE> function disables interrupts, enables address broadcasting, and executes a <code>sync</code> instruction. Interrupts are then restored to their prior state, and address broadcasting is disabled.</P> 32<P>The <CODE>PPCSync</CODE> function flushes all I/O traffic being reserved by the CPU for main memory. This is required when applications demand that memory be updated appropriately. For example, you may need to call the <CODE>PPCSync</CODE> function before the graphics processor accesses data to confirm that the data actually exists in main memory after data used by the graphics processor is flushed from the cache.( (See <A href="../Cache/DCFlushRangeNoSync.html"><CODE>DCFlushRangeNoSync</CODE></A> or <A href="../Cache/DCStoreRangeNoSync.html"><CODE>DCStoreRangeNoSync</CODE></A>)</P> 33<P>Be aware that DMA transfers into and out of the locked cache are not affected by the <CODE>PPCSync</CODE> function. You should use the locked cache queue operations to ensure that DMA operations have completed.</P> 34<P>The <CODE>PPCSync</CODE> function takes a significant amount of time, so indiscriminate use of this function may adversely affect performance.</P> 35 36<h2>See Also</h2> 37<P class="reference"> 38<a href="../toc.html#Cache" target="contents">Cache Functions</a>, 39<a href="../Cache/DCFlushRangeNoSync.html">DCFlushRangeNoSync</a>, 40<a href="../Cache/DCStoreRangeNoSync.html">DCStoreRangeNoSync</a> 41</p> 42 43<h2>Revision History</h2> 44<P> 452006/03/01 Initial version.<br> 46</P> 47 48<hr><p>CONFIDENTIAL</p></body> 49</html>