Do BSPs only have to be logical thread 0 ?

Do BSPs only have to be logical thread 0 ?

[Shubha Ramani]

In other words, suppose a BSP  is running in hyperthreaded ON mode and it has 2 threads per physical core. Can the BSP be either thread 0 or thread 1 ?Is this documented somewhere ?
Thanks,
Shubha Shubha D. Ramanishubharamani@gmail.com
shubharamani@yahoo.com
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Re: Do BSPs only have to be logical thread 0 ?

[Fan, Jeff]

When system power on, one processor (usually, it is thread 0) will be selected to be BSP, it is descripted in IA32 Software Developer User Manual.
On POST phase, PI MP PPI and Protocol service provide SwitchBSP() service to switch BSP to other enabled thread, it is descripted in PI specification.

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Shubha Ramani
Sent: Wednesday, August 17, 2016 4:16 AM
To: edk2-devel@lists.01.org
Subject: [edk2] Do BSPs only have to be logical thread 0 ?

In other words, suppose a BSP  is running in hyperthreaded ON mode and it has 2 threads per physical core. Can the BSP be either thread 0 or thread 1 ?Is this documented somewhere ?
Thanks,
Shubha Shubha D. Ramanishubharamani@gmail.com shubharamani@yahoo.com _______________________________________________
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incorrected set variable size in InitSmmProfileCallBack of UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c

[wang xiaofeng]

Hi Jeff,
    Not sure whether you owns SmmProfile.c. I found the following logic is incorrect.
  sizeof(mSmmProfileBase) is 8, we should use sizeof(SMM_PROFILE_HEADER). Otherwise the variable size is incorrect


| gRT->SetVariable ( |
| | SMM_PROFILE_NAME, |
| | &gEfiCallerIdGuid, |
| | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, |
| | sizeof(mSmmProfileBase), |
| | &mSmmProfileBase |
| |
);












|

Re: incorrected set variable size in InitSmmProfileCallBack of UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c

[wang xiaofeng]

Jiewen,
   Thanks for the information.





At 2016-08-24 11:56:48, "Yao, Jiewen" <jiewen.yao@intel.com> wrote:
>Hi
>That is done by design. We just need save the *pointer* to variable region, not the *content*.
>The content is in EfiReservedMemoryType memory.
>
>An OS application can get this pointer and parse the data pointed by mSmmProfileBase
>
>Thank you
>Yao Jiewen
>
>From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of wang xiaofeng
>Sent: Wednesday, August 24, 2016 11:43 AM
>To: Fan, Jeff <jeff.fan@intel.com>
>Cc: edk2-devel@lists.01.org
>Subject: [edk2] incorrected set variable size in InitSmmProfileCallBack of UefiCpuPkg/PiSmmCpuDxeSmm/SmmProfile.c
>
>Hi Jeff,
>    Not sure whether you owns SmmProfile.c. I found the following logic is incorrect.
>  sizeof(mSmmProfileBase) is 8, we should use sizeof(SMM_PROFILE_HEADER). Otherwise the variable size is incorrect
>
>
>| gRT->SetVariable ( |
>| | SMM_PROFILE_NAME, |
>| | &gEfiCallerIdGuid, |
>| | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, |
>| | sizeof(mSmmProfileBase), |
>| | &mSmmProfileBase |
>| |
>);
>
>
>
>
>
>
>
>
>
>
>
>
>|
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