Messages in this thread | | | Date | Tue, 3 Dec 2002 16:11:48 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Reserving physical memory at boot time |
| |
On Tue, 3 Dec 2002, Duncan Sands wrote:
> I would like to reserve a particular page of physical memory when > the kernel boots. By reserving I mean that no one else gets to read > from it or write to it: it is mine. Any suggestions for the best way > to go about this with a 2.5 kernel? > > Thanks, > > Duncan.
If you need a certain page reserved at boot-time you are out-of-luck. You can tell the kernel (using mem=xxx on the boot command line) that you have somewhat less memory than you do and then you can write a module that accesses the other memory that the kernel doesn't use.
If you just want to make sure that your module owns a particular page that nobody else uses, just use ioremap() in your module to allocate a particular address. Those page(s) are now owned by your module and will never be paged. You can access those pages from user-space by providing some connectivity in your module (like read()/write()/ioctl()).
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Bush : The Fourth Reich of America
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |