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<TITLE>RE: [openib-general] Reserved L_Key API</TITLE>
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<P><FONT SIZE=2>> -----Original Message-----</FONT>
<BR><FONT SIZE=2>> From: Roland Dreier [<A HREF="mailto:roland@topspin.com">mailto:roland@topspin.com</A>] </FONT>
<BR><FONT SIZE=2>> Sent: Wednesday, September 15, 2004 6:41 PM</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> By the way, I notice that neither the API nor the Tavor MPT </FONT>
<BR><FONT SIZE=2>> format seem to allow creating memory regions of size 2^64 </FONT>
<BR><FONT SIZE=2>> since they use a 64-bit value for the size (which means </FONT>
<BR><FONT SIZE=2>> they're limited to 2^64 - 1). I don't think this is a serious </FONT>
<BR><FONT SIZE=2>> issue though.</FONT>
<BR><FONT SIZE=2>> </FONT>
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<P><FONT SIZE=2>Think of Tavor as a software friendly design. Use:</FONT>
<BR><FONT SIZE=2> start address = 0x0000000000000001</FONT>
<BR><FONT SIZE=2> length = 0xffffffffffffffff</FONT>
<BR><FONT SIZE=2> pa = 1</FONT>
<BR><FONT SIZE=2>And then you got all memory space mapped + </FONT>
<BR><FONT SIZE=2>protection violation if you try to access a NULL</FONT>
<BR><FONT SIZE=2>pointer :)</FONT>
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