Messages in this thread | | | Date | Wed, 04 Dec 2002 17:44:12 +0100 | From | Mike Galbraith <> | Subject | Re: Reserving physical memory at boot time |
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At 08:25 AM 12/4/2002 -0500, Richard B. Johnson wrote: >On 3 Dec 2002, Alan Cox wrote: > > > On Tue, 2002-12-03 at 21:11, Richard B. Johnson wrote: > > > If you need a certain page reserved at boot-time you are out-of-luck. > > > > Wrong - you can specify the precise memory map of a box as well as use > > mem= to set the top of used memory. Its a painful way of marking a page > > and it only works for a page the kernel isnt loaded into. > > > >If you are refering to the "reserve=" kernel parameter, I don't >think it works for memory addresses that are inside existing RAM. >I guess if you used the "mem=" parameter to keep the kernel from >using that RAM, the combination might work, but I have never >tried it.
reserve= is for IO ports (kernel/resource.c). I think Alan was referring to mem=exactmap.
If Duncan didn't have the pesky requirement that his module work in an unmodified kernel, it would be easy to use __alloc_bootmem() to reserve an address range and expose via /proc. But alas...
-Mike
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