Virtual Memory map

[valdis.kletnieks at vt.edu]

On Tue, 12 Dec 2017 20:14:35 +0100, Damian Tometzki said:

> How are the bits (in brackets) calculated in the virtual memory map ?

For x86_64 architecture, the 47 comes from the fact that currently shipping
CPUs have an architected 48 bit wide memory address bus, and the fact that
Linux does a "userspace lower half, kernel upper half" division of the address
space.

Recently, a patch for 5-level page tables went it, to support upcoming hardware
that provides hardware support for 56-bit memory address buses.

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