回复: [PATCH] MdePkg: use CpuPause() in CpuDeadLoop()

["gaoliming" <gaoliming@byosoft.com.cn>]

Ankur:
  Can you give the detail usage for the lower power state when enter into
CpuDeadLoop()?  

Thanks
Liming
> -----邮件原件-----
> 发件人: Ankur Arora <ankur.a.arora@oracle.com>
> 发送时间: 2021年3月17日 6:59
> 收件人: devel@edk2.groups.io
> 抄送: Ankur Arora <ankur.a.arora@oracle.com>; Liming Gao
> <gaoliming@byosoft.com.cn>; Michael D Kinney
> <michael.d.kinney@intel.com>
> 主题: [PATCH] MdePkg: use CpuPause() in CpuDeadLoop()
> 
> Use CpuPause() to allow the CPU to go into a lower power state
> state while we spin wait.
> 
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
> ---
>  MdePkg/Library/BaseLib/CpuDeadLoop.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/MdePkg/Library/BaseLib/CpuDeadLoop.c
> b/MdePkg/Library/BaseLib/CpuDeadLoop.c
> index 9e110cacbc96..3cd304351a65 100644
> --- a/MdePkg/Library/BaseLib/CpuDeadLoop.c
> +++ b/MdePkg/Library/BaseLib/CpuDeadLoop.c
> @@ -28,5 +28,7 @@ CpuDeadLoop (
>  {
>    volatile UINTN  Index;
> 
> -  for (Index = 0; Index == 0;);
> +  for (Index = 0; Index == 0;) {
> +    CpuPause();
> +  }
>  }
> --
> 2.9.3