How to tell whether an address is from low-memory or high-memory ?

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To: linux-newbie@xxxxxxxxxxxxxxx
Subject: How to tell whether an address is from low-memory or high-memory ?
From: William Tambe <tambewilliam@xxxxxxxxx>
Date: Thu, 14 Nov 2019 15:27:23 -0600

How to tell whether an address is from low-memory or high-memory ?

And are addresses in low-memory always a 1-to-1 mapping to physical memory ?

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