Messages in this thread | | | Subject | Re: reserve memory in low physical address - possible? | From | Alan Cox <> | Date | Tue, 31 Oct 2006 16:01:10 +0000 |
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Ar Maw, 2006-10-31 am 07:40 -0800, ysgrifennodd Jun Sun: > On Tue, Oct 31, 2006 at 07:32:37AM -0500, Richard B. Johnson wrote: > > > > You will not be able to reserve any address space starting at 0 anyway, but > > your driver or even > > user-space code can memory-map it. > > > > Any reasons or concerns as to why I can't reserve any address space > starting from 0?
None at all, Richard is wrong on this point. You can happily reserve memory starting at physical zero on an x86. In fact the x86 kernel *already* does this because many BIOSes use the first page for BIOS data and touch it when we use BIOS services or in SMM.
For a worked example of loading Linux under a small RTOS take a look at RTLinux, which turns Linux into on task running on a tiny strict RT kernel.
Alan
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