From owner-svn-src-head@freebsd.org  Wed Oct 19 18:05:47 2016
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From: John Baldwin <jhb@freebsd.org>
To: Warner Losh <imp@bsdimp.com>
Cc: Doug Ambrisko <ambrisko@ambrisko.com>,
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Subject: Re: svn commit: r307326 - head/sys/boot/efi/loader
Date: Wed, 19 Oct 2016 10:34:49 -0700
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On Wednesday, October 19, 2016 02:01:18 AM Warner Losh wrote:
> One of my systems would export these as sysctls:
> 
> smbios.bios.reldate="07/05/2013"
> smbios.bios.vendor="American Megatrends Inc."
> smbios.bios.version="3.00"
> smbios.chassis.maker="Supermicro"
> smbios.chassis.serial="0123456789"
> smbios.chassis.tag="To Be Filled By O.E.M."
> smbios.chassis.version="0123456789"
> smbios.memory.enabled="268435456"
> smbios.planar.location="To be filled by O.E.M."
> smbios.planar.maker="Supermicro"
> smbios.planar.product="X9SRH-7F/7TF"
> smbios.planar.serial="VM13CS028237"
> smbios.planar.tag="To be filled by O.E.M."
> smbios.planar.version="0123456789"
> smbios.socket.enabled="1"
> smbios.socket.populated="1"
> smbios.system.family="To be filled by O.E.M."
> smbios.system.maker="Supermicro"
> smbios.system.product="X9SRH-7F/7TF"
> smbios.system.serial="0123456789"
> smbios.system.sku="To be filled by O.E.M."
> smbios.system.uuid="00000000-0000-0000-0000-002590e4d0ec"
> smbios.system.version="0123456789"
> smbios.version="2.7"
> 
> though some of them are silly due to the BIOS writer being silly...

So are you planning to just duplicate the existing kenv vars as sysctl
nodes?  Can't you parse the output of kenv instead?

-- 
John Baldwin