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From: Bruce Evans <brde@optusnet.com.au>
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To: Bruce Evans <bde@freebsd.org>
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Subject: Re: svn commit: r326932 - in head/sys: i386/i386 x86/acpica x86/x86
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On Mon, 18 Dec 2017, Bruce Evans wrote:

> Author: bde
> Date: Mon Dec 18 13:53:22 2017
> New Revision: 326932
> URL: https://svnweb.freebsd.org/changeset/base/326932
>
> Log:
>  Remove the permanent double mapping of low physical memory and replace
>  it by a transient double mapping for the one instruction in ACPI wakeup
>  where it is needed (and for many surrounding instructions in ACPI resume).
>  Invalidate the TLB as soon as convenient after undoing the transient
>  mapping.  ACPI resume already has the strict ordering needed for this.

Forgot: Reviewed by: kib

This central part of my recent fixes involving the permanent double mapping
needed review more than the previous parts.

Bruce