<br><br><div class="gmail_quote">On Mon, Feb 18, 2013 at 1:55 AM, horseriver <span dir="ltr"><<a href="mailto:horserivers@gmail.com" target="_blank">horserivers@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
hi:)<br>
<br>
The gdtr reg saves the base address of gdt , whether is this address a linear address or phisical address ?<br></blockquote><div>According to <br></div><div>Intel® 64 and IA-32 Architectures<br>Software Developer’s Manual<br>
Volume 3B:<br>System Programming Guide, Part 2<br><br>for 64 bit machines:<br><br>On processors that support Intel 64 architecture, the base-address fields for FS,<br>GS, GDTR, IDTR, and TR must contain canonical addresses.<br>
Look for definition of canonical addresses here:<br><a href="http://en.wikipedia.org/wiki/X86-64">http://en.wikipedia.org/wiki/X86-64</a><br><br><br>According to this book all addresses in GDTR, LDTR and IDTR are linear addresses <br>
<a href="http://books.google.co.uk/books?id=l8QPUGuElFwC&pg=SA7-PA15&lpg=SA7-PA15&dq=GDTR+32+bit&source=bl&ots=4rS-pTNmaE&sig=CasnhDIFc9pVr0fsAlNqAod-xFc&hl=en&sa=X&ei=vRoiUZXDAojK0QXf8IHYBA&ved=0CEgQ6AEwBQ#v=onepage&q=GDTR%2032%20bit&f=false">http://books.google.co.uk/books?id=l8QPUGuElFwC&pg=SA7-PA15&lpg=SA7-PA15&dq=GDTR+32+bit&source=bl&ots=4rS-pTNmaE&sig=CasnhDIFc9pVr0fsAlNqAod-xFc&hl=en&sa=X&ei=vRoiUZXDAojK0QXf8IHYBA&ved=0CEgQ6AEwBQ#v=onepage&q=GDTR%2032%20bit&f=false</a><br>
<br>Intel® 64 and IA-32 Architectures<br>Software Developer’s Manual<br>Volume 3A:<br>System Programming Guide, Part 1<br>page 65<br><br>The linear address of the base of the GDT is contained in the GDT register (GDTR);<br>
the linear address of the LDT is contained in the LDT register (LDTR).<br><br><br>However for 32 bit registers, this document provides some details in protected mode:<br><br><a href="http://home.swipnet.se/smaffy/asm/info/PMODEDetailedApproach.txt">http://home.swipnet.se/smaffy/asm/info/PMODEDetailedApproach.txt</a><br>
<br><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
thanks!<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Thank you <br>Warm Regards<br>Anuz<br>