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From: "gaoliming" <gaoliming@byosoft.com.cn>
To: "'Ankur Arora'" <ankur.a.arora@oracle.com>,
	<devel@edk2.groups.io>
Cc: "'Michael D Kinney'" <michael.d.kinney@intel.com>
References: <20210316225918.2625938-1-ankur.a.arora@oracle.com>
In-Reply-To: <20210316225918.2625938-1-ankur.a.arora@oracle.com>
Subject: =?UTF-8?B?5Zue5aSNOiBbUEFUQ0hdIE1kZVBrZzogdXNlIENwdVBhdXNlKCkgaW4gQ3B1RGVhZExvb3AoKQ==?=
Date: Wed, 17 Mar 2021 09:08:25 +0800
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Ankur:
  Can you give the detail usage for the lower power state when enter =
into
CpuDeadLoop()? =20

Thanks
Liming
> -----=D3=CA=BC=FE=D4=AD=BC=FE-----
> =B7=A2=BC=FE=C8=CB: Ankur Arora <ankur.a.arora@oracle.com>
> =B7=A2=CB=CD=CA=B1=BC=E4: 2021=C4=EA3=D4=C217=C8=D5 6:59
> =CA=D5=BC=FE=C8=CB: devel@edk2.groups.io
> =B3=AD=CB=CD: Ankur Arora <ankur.a.arora@oracle.com>; Liming Gao
> <gaoliming@byosoft.com.cn>; Michael D Kinney
> <michael.d.kinney@intel.com>
> =D6=F7=CC=E2: [PATCH] MdePkg: use CpuPause() in CpuDeadLoop()
>=20
> Use CpuPause() to allow the CPU to go into a lower power state
> state while we spin wait.
>=20
> 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(-)
>=20
> 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;
>=20
> -  for (Index =3D 0; Index =3D=3D 0;);
> +  for (Index =3D 0; Index =3D=3D 0;) {
> +    CpuPause();
> +  }
>  }
> --
> 2.9.3