How to know if system running in UEFI boot mode?

Johny

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Nov 11, 2009, 9:58:16 AM11/11/09

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Dear All,

Is there any API or registry item can indicate if system is running in UEFI
boot mode or BIOS boot mode ?

When install system on Dell PowerEdge 710, user can select BIOS boot mode or
UEFI boot mode. My question is, when windows system is started, how to know
if it is running in UEFI boot mode or BIOS boot mode.

Thanks in advance.

Thanks

Don Burn

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Nov 11, 2009, 10:17:16 AM11/11/09

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Why would you care once the OS is up?

--
Don Burn (MVP, Windows DKD)
Windows Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
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oren murray

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Feb 15, 2011, 1:40:24 PM2/15/11

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He probably has reasons, you homosexual.

> On Wednesday, November 11, 2009 9:58 AM Johny wrote:

> Dear All,
>
> Is there any API or registry item can indicate if system is running in UEFI
> boot mode or BIOS boot mode ?
>
> When install system on Dell PowerEdge 710, user can select BIOS boot mode or
> UEFI boot mode. My question is, when windows system is started, how to know
> if it is running in UEFI boot mode or BIOS boot mode.
>
> Thanks in advance.
>
> Thanks

>> On Wednesday, November 11, 2009 10:17 AM Don Burn wrote:

>> Why would you care once the OS is up?
>>
>>
>> --
>> Don Burn (MVP, Windows DKD)
>> Windows Filesystem and Driver Consulting
>> Website: http://www.windrvr.com
>> Blog: http://msmvps.com/blogs/WinDrvr
>> Remove StopSpam to reply
>>
>>
>>
>>
>>
>>

>> __________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________
>>
>> The message was checked by ESET NOD32 Antivirus.
>>
>> http://www.eset.com

>> Submitted via EggHeadCafe
>> Obsessive Defragmentation Disorder (ODD) and You
>> http://www.eggheadcafe.com/tutorials/aspnet/b5f241d0-4e5d-44f9-aad9-78211fdea4df/obsessive-defragmentation-disorder-odd-and-you.aspx

oren murray

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Feb 15, 2011, 1:42:01 PM2/15/11

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He probably has reasons, you homosexual.

> On Wednesday, November 11, 2009 9:58 AM Johny wrote:

> Dear All,
>
> Is there any API or registry item can indicate if system is running in UEFI
> boot mode or BIOS boot mode ?
>
> When install system on Dell PowerEdge 710, user can select BIOS boot mode or
> UEFI boot mode. My question is, when windows system is started, how to know
> if it is running in UEFI boot mode or BIOS boot mode.
>
> Thanks in advance.
>
> Thanks

>> On Wednesday, November 11, 2009 10:17 AM Don Burn wrote:

>> Why would you care once the OS is up?
>>
>>
>> --
>> Don Burn (MVP, Windows DKD)
>> Windows Filesystem and Driver Consulting
>> Website: http://www.windrvr.com
>> Blog: http://msmvps.com/blogs/WinDrvr
>> Remove StopSpam to reply
>>
>>
>>
>>
>>
>>

>> __________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________
>>
>> The message was checked by ESET NOD32 Antivirus.
>>
>> http://www.eset.com

>>> On Tuesday, February 15, 2011 1:40 PM oren murray wrote:

>>> He probably has reasons, you homosexual.

>>> Submitted via EggHeadCafe
>>> Excel Generate High Quality RoadMaps
>>> http://www.eggheadcafe.com/tutorials/aspnet/3310004f-e1ae-45a7-9bea-7b2b970d1230/excel-generate-high-quality-roadmaps.aspx

Pico Ohms

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Apr 4, 2011, 7:28:49 AM4/4/11

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I had the same question today as we're looking at writing our boot modules. Based on this document:

http://www.uefi.org/events/UEFI-Plugfest-WindowsBootEnvironment.pdf

You should be able to use "bcdedit /enum" to enumerate the BCD settings. Under "Windows Boot Loader", you'll see a path description "\Windows\system32\winload.efi" if the system is booting from EFI mode.

> On Wednesday, November 11, 2009 9:58 AM Johny wrote:

>> On Wednesday, November 11, 2009 10:17 AM Don Burn wrote:

>> Why would you care once the OS is up?
>>
>>
>> --
>> Don Burn (MVP, Windows DKD)
>> Windows Filesystem and Driver Consulting
>> Website: http://www.windrvr.com
>> Blog: http://msmvps.com/blogs/WinDrvr
>> Remove StopSpam to reply
>>
>>
>>
>>
>>
>>
>> __________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________
>>
>> The message was checked by ESET NOD32 Antivirus.
>>
>> http://www.eset.com

>>> On Tuesday, February 15, 2011 1:40 PM oren murray wrote:

>>> He probably has reasons, you homosexual.