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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