Re: [PATCH] IntelFsp2Pkg: Add FunctionParametePtr to FspGlobalData.

["Chiu, Chasel" <chasel.chiu@intel.com>]

Yes, thanks for good catch! I will correct it.

> -----Original Message-----
> From: Zeng, Star <star.zeng@intel.com>
> Sent: Wednesday, May 20, 2020 12:21 PM
> To: Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>; Chiu, Chasel
> <chasel.chiu@intel.com>; devel@edk2.groups.io
> Cc: Ma, Maurice <maurice.ma@intel.com>; Zeng, Star <star.zeng@intel.com>
> Subject: RE: [PATCH] IntelFsp2Pkg: Add FunctionParametePtr to
> FspGlobalData.
> 
> equilivant is a typo?
> 
> > -----Original Message-----
> > From: Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>
> > Sent: Wednesday, May 20, 2020 12:12 PM
> > To: Chiu, Chasel <chasel.chiu@intel.com>; devel@edk2.groups.io
> > Cc: Ma, Maurice <maurice.ma@intel.com>; Zeng, Star
> > <star.zeng@intel.com>
> > Subject: RE: [PATCH] IntelFsp2Pkg: Add FunctionParametePtr to
> > FspGlobalData.
> >
> > Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
> >
> > > -----Original Message-----
> > > From: Chiu, Chasel <chasel.chiu@intel.com>
> > > Sent: Tuesday, May 19, 2020 8:34 PM
> > > To: devel@edk2.groups.io
> > > Cc: Ma, Maurice <maurice.ma@intel.com>; Desimone, Nathaniel L
> > > <nathaniel.l.desimone@intel.com>; Zeng, Star <star.zeng@intel.com>
> > > Subject: [PATCH] IntelFsp2Pkg: Add FunctionParametePtr to
> FspGlobalData.
> > >
> > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2726
> > >
> > > When FSP switching stack and calling bootloader functions, the
> > > function parameter in stack may not be accessible easily.
> > > We can store the function parameter pointer to FspGlobalData and
> > > retrieve it after stack switched.
> > >
> > > Also need to add Loader2PeiSwitchStack () to header file as public
> > > function for platform FSP code to consume.
> > >
> > > Cc: Maurice Ma <maurice.ma@intel.com>
> > > Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
> > > Cc: Star Zeng <star.zeng@intel.com>
> > > Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
> > > ---
> > >  IntelFsp2Pkg/Include/FspGlobalData.h             | 12
> ++++++++++--
> > >  IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h | 18
> > > +++++++++++++++++-
> > >  2 files changed, 27 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/IntelFsp2Pkg/Include/FspGlobalData.h
> > > b/IntelFsp2Pkg/Include/FspGlobalData.h
> > > index 5bde316893..dba9b48e1a 100644
> > > --- a/IntelFsp2Pkg/Include/FspGlobalData.h
> > > +++ b/IntelFsp2Pkg/Include/FspGlobalData.h
> > > @@ -52,12 +52,20 @@ typedef struct  {
> > >     VOID               *MemoryInitUpdPtr;
> > >     VOID               *SiliconInitUpdPtr;
> > >     UINT8              ApiIdx;
> > > -   UINT8              FspMode; // 0: FSP in API mode; 1: FSP in
> > DISPATCH mode
> > > +   ///
> > > +   /// 0: FSP in API mode; 1: FSP in DISPATCH mode
> > > +   ///
> > > +   UINT8              FspMode;
> > >     UINT8              OnSeparateStack;
> > >     UINT8              Reserved3;
> > >     UINT32             NumberOfPhases;
> > >     UINT32             PhasesExecuted;
> > > -   UINT8              Reserved4[20];
> > > +   ///
> > > +   /// To store function parameters pointer
> > > +   /// so it can be retrieved after stack switched.
> > > +   ///
> > > +   VOID               *FunctionParameterPtr;
> > > +   UINT8              Reserved4[16];
> > >     UINT32             PerfSig;
> > >     UINT16             PerfLen;
> > >     UINT16             Reserved5;
> > > diff --git a/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h
> > > b/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h
> > > index 0c76e9f022..bed2a5d677 100644
> > > --- a/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h
> > > +++ b/IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h
> > > @@ -1,6 +1,6 @@
> > >  /** @file
> > >
> > > -  Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
> > > +  Copyright (c) 2014 - 2020, Intel Corporation. All rights
> > > + reserved.<BR>
> > >    SPDX-License-Identifier: BSD-2-Clause-Patent
> > >
> > >  **/
> > > @@ -36,4 +36,20 @@ Pei2LoaderSwitchStack (
> > >    VOID
> > >    );
> > >
> > > +/**
> > > +
> > > +  This function is equilivant to Pei2LoaderSwitchStack () but just
> > > + indicates  the stack after switched is FSP stack.
> > > +
> > > +  @return ReturnKey          After switching to the saved stack,
> > > +                             this value will be saved in eax before
> > returning.
> > > +
> > > +
> > > +**/
> > > +UINT32
> > > +EFIAPI
> > > +Loader2PeiSwitchStack (
> > > +  VOID
> > > +  );
> > > +
> > >  #endif
> > > --
> > > 2.13.3.windows.1