Messages in this thread | | | Date | Fri, 20 Apr 2007 21:01:01 +0200 | From | Rene Herman <> | Subject | Re: how to tell linux (on x86) to ignore 1M or memory |
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On 04/19/2007 04:18 PM, Bart Trojanowski wrote:
> I need to preserve some state from the bios before entering protected > mode. For now I want to copy it into some ram accessible by real-mode, > say the last megabyte visible in real-mode. > > What's the easiest way to have linux ignore the megabyte starting at 15M?
Note that real-mode can only access the first megabyte (*) and not the first 16. 16MB is the 16-bit protected mode (286) limit.
(*) well, the first 1M + 64K - 16 bytes using segment FFFF assuming A20 is enabled and x > 1 in x86...
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