Maximum physical memory on i386 platform

[Ravi K <kravi26@yahoo.com>]

Hi,
  The configuration help for HIGHMEM feature on i386
platform states that 'Linux can use up to 64 Gigabytes
of physical memory on x86 systems'. I see a problem
with this:
 - page structures needed to support 64GB would take
up 1GB memory (64 bytes per page of size 4k) 
 - but the kernel can only use 896MB memory, unless
PAGE_OFFSET is changed to a lower value
 - enabling 64GB support does not automatically change
the value of PAGE_OFFSET
   So how are the page structures created if a machine
has 64GB memory? Or is it necessary to change 
PAGE_OFFSET (to 0x80000000) in such a configuration?

Thanks,
Ravi.

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