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Subject: Re: [PATCH] UefiCpuPkg/SecCore: Add pre-memory AP vector
To: Deric Cole <deric.cole@intel.com>, devel@edk2.groups.io
Cc: Eric Dong <eric.dong@intel.com>, Ray Ni <ray.ni@intel.com>
References: <20200601223225.1925-1-deric.cole@intel.com>
From: "Laszlo Ersek" <lersek@redhat.com>
Message-ID: <0c7ebc21-c32a-e25b-83f6-b85c01b0b7fa@redhat.com>
Date: Tue, 2 Jun 2020 14:53:52 +0200
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On 06/02/20 00:32, Deric Cole wrote:
> REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2776
> 
> Add a vector at 0xFF000 (0xFFFFF000) that can be used by Init-SIPI-SIPI
> to start an AP before memory is initialized. This vector jumps into the
> same SEC entry point as the ordinary reset vector, with a special value
> of "AP" in the DI register. The platform-specific SEC code is expected
> to check for that value and take a different path for APs, if this
> feature is supported by the platform.
> 
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Signed-off-by: Deric Cole <deric.cole@intel.com>
> ---
>  UefiCpuPkg/SecCore/Ia32/ResetVec.nasmb | 31 ++++++++++++++++++++++++-------
>  1 file changed, 24 insertions(+), 7 deletions(-)

I'll let Ray and Eric review this.

Thanks
Laszlo