rom bios

rom bios

[DONGYAOZU]

When looking at the guest physical address space
layout, I am confused by the rombios location. Besides
normal bios position (0xE0000-1M), it seems the whole
region 2 is for that purpose too (4G-12K--4G), and
region 0 high end sapce also have a copy.

What is the reason to have multiple copy of rom bios?
Thanks, Dong


 
____________________________________________________________________________________
Never miss an email again!
Yahoo! Toolbar alerts you the instant new Mail arrives.
http://tools.search.yahoo.com/toolbar/features/mail/

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV

Re: rom bios

[Avi Kivity]

DONGYAOZU wrote:
> When looking at the guest physical address space
> layout, I am confused by the rombios location. Besides
> normal bios position (0xE0000-1M), it seems the whole
> region 2 is for that purpose too (4G-12K--4G), and
> region 0 high end sapce also have a copy.
>
> What is the reason to have multiple copy of rom bios?
>   

The x86 reset vector is 0xfffffff0 physical, so we need a copy there.


-- 
error compiling committee.c: too many arguments to function


-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV