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vxworks相关论文

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<h4 class="H4"><i><a name="84805">Memory Layout</a></i></h4>
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<dd><p class="Body"><a name="85184"> </a>The VxWorks memory layout is the same for all the ARM processors. <a href="x-arm5.html#85726">Figure&nbsp;G-2</a> shows memory layout, labeled as follows:<p class="table">

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<p class="BodyLeft"><a name="85228"> </a>Vectors </p>

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<p class="BodyLeft"><a name="85230"> </a>Table of exception/interrupt vectors.</p>

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<p class="BodyLeft"><a name="85232"> </a>FIQ Code </p>

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<p class="BodyLeft"><a name="85234"> </a>Reserved for FIQ handling code.</p>

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<p class="BodyLeft"><a name="85236"> </a>Exception pointers </p>

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<p class="BodyLeft"><a name="85238"> </a>Pointers to exception routines, which are used by the vectors.</p>

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<p class="BodyLeft"><a name="85240"> </a>Boot Line </p>

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<p class="BodyLeft"><a name="85242"> </a>ASCII string of boot parameters.</p>

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<p class="BodyLeft"><a name="85244"> </a>Exception Message </p>

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<p class="BodyLeft"><a name="85246"> </a>ASCII string of fatal exception message.</p>

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<p class="BodyLeft"><a name="85248"> </a>Initial Stack </p>

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<p class="BodyLeft"><a name="85250"> </a>Initial stack for <b class="routine"><i class="routine">usrInit</i></b><b>(</b>&nbsp;<b>)</b>, until <b class="routine"><i class="routine">usrRoot</i></b><b>(</b>&nbsp;<b>)</b> gets allocated stack.</p>

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<p class="BodyLeft"><a name="85252"> </a>System Image </p>

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<p class="BodyLeft"><a name="85254"> </a>VxWorks itself (three sections: text, data, bss). The entry point for VxWorks is at the start of this region.</p>

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<p class="BodyLeft"><a name="85256"> </a>WDB Memory Pool </p>

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<p class="BodyLeft"><a name="85258"> </a>Size depends on the macro <b class="symbol_UC">WDB_POOL_SIZE</b> which defaults to one-sixteenth of the system memory pool. This space is used by the target server to support host-based tools. Modify <b class="symbol_UC">WDB_POOL_SIZE</b> under <b class="symbol_UC">INCLUDE_WDB</b>.</p>

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<p class="BodyLeft"><a name="85260"> </a>System Memory Pool </p>

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<p class="BodyLeft"><a name="85262"> </a>Size depends on size of the system image.The <b class="routine"><i class="routine">sysMemTop</i></b><b>(</b>&nbsp;<b>)</b> routine returns the end of the free memory pool.</p>

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<dd><p class="Body"><a name="85607"> </a>All addresses shown in <a href="x-arm5.html#85726">Figure&nbsp;G-2</a> are relative to the start of memory for a particular target board. The start of memory (corresponding to 0x0 in the memory-layout diagram) is defined as <b class="symbol_UC">LOCAL_MEM_LOCAL_ADRS</b> under <b class="symbol_UC">INCLUDE_MEMORY_CONFIG</b> for each target. </p>
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<hr><div class="CalloutCell"><a name="85037"><b class="symbol_UC"><font face="Helvetica, sans-serif" size="-1" class="sans">NOTE:  </font></b></a>The initial stack and system image addresses are configured within the BSP.</div>
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<h4 class="EntityTitle"><a name="85726"><font face="Helvetica, sans-serif" size="-1" class="sans">Figure G-2:&nbsp;&nbsp;VxWorks System Memory Layout (ARM)</font></a></h4>

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