Kernel: Support Meteor Lake memory map #25725
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On Meteor Lake this range covers the GFX address space reservations, at a very high address. Nothing actually ends up using it, so we can ignore it. Moreover if we don't we end up with highest_address at the 4 TiB mark which would need an enormous page table to map this huge (0-4TiB) range. Until we support mapping I/O space piecewise we need to skip this range.
When running with 32GiB of system RAM, 2MiB is not enough for the page usage bitmap. New value should be enough for 128GiB of RAM
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On my darp10-b the memory map ends up breaking the early init routines. Here are the fixes