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SubjectRe: mm question
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>  How does one do the following task: obtain a bunch of free pages (around
> 300K) with physical addresses between certain bounds (more then
> 0x4000000, but it is likely this is not constant) reserver them and map to
> kernel space so that the driver can access them directly ?

We support allocating pages below 16Mb, below 4Gb, or anywhere within RAM
on x86. If you want to within a range or your 300K must be a single 300K
block then you need to allocate it at boot time
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