On 28-04-08 16:18, Vaughn Clinton wrote:
This is a good question because I'm not sure how different this would be
defined in an x86_64 environment. If someone does answer this can they
include the explaination for the x86_64 as well as the x86 please.
Highmem does not exist on it so all memory is in ZONE_NORMAL. ZONE_DMA does
still exists for LPC (ISA in disguise) devices and a DMA32 zone exists for
devices with 32-bit DMA restrictions.
With respect to address-space layout, check Documentation/x86-64/mm.txt.
Also note from that map that a difference from 32-bit is the fixed kernel
image mapping at the end of the address-space. On 32-bit, it's just where
you load it as I said for 32-bit.
I'm not very up on 64-bit, but those would be the/some 64-bit specific
points. No highmem is ofcourse the important one.
Rene.
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