Re: [PATCH v2 2/8] MdeModulePkg/CpuExceptionHandlerLib.h: Add a new API

["Wang, Jian J" <jian.j.wang@intel.com>]

Good idea. I think it should be defined in also in following file besides the new API

MdeModulePkg\Include\Library\CpuExceptionHandlerLib.h

> -----Original Message-----
> From: Yao, Jiewen
> Sent: Thursday, November 23, 2017 12:08 PM
> To: Wang, Jian J <jian.j.wang@intel.com>; edk2-devel@lists.01.org
> Cc: Dong, Eric <eric.dong@intel.com>; Zeng, Star <star.zeng@intel.com>
> Subject: RE: [edk2] [PATCH v2 2/8] MdeModulePkg/CpuExceptionHandlerLib.h:
> Add a new API
> 
> Hi
> I am a little worried about the way to use VOID * to pass arch dependent data.
> 
> Can we define it clearly in each ARCH in the header file, and use a UNION to
> include all arch?
> 
> I think both the caller and the callee need parse it. As such, VOID * is not a good
> way.
> 
> Thank you
> Yao Jiewen
> 
> > -----Original Message-----
> > From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Jian
> J
> > Wang
> > Sent: Wednesday, November 22, 2017 4:46 PM
> > To: edk2-devel@lists.01.org
> > Cc: Yao, Jiewen <jiewen.yao@intel.com>; Dong, Eric <eric.dong@intel.com>;
> > Zeng, Star <star.zeng@intel.com>
> > Subject: [edk2] [PATCH v2 2/8] MdeModulePkg/CpuExceptionHandlerLib.h:
> Add
> > a new API
> >
> > > v2:
> > >    Add prototype definition of InitializeCpuExceptionStackSwitchHandlers()
> >
> > A new API InitializeCpuExceptionStackSwitchHandlers() is introduced to
> support
> > initializing exception handlers being able to switch stack. StackSwitchData is
> > arch dependent and required by IA32 processor to convey resources reserved
> in
> > advance. This is necessary because the CpuExceptionHandlerLib will be linked
> > in different phases, in which there's no common way to reserve resources.
> >
> > EFI_STATUS
> > EFIAPI
> > InitializeCpuExceptionStackSwitchHandlers (
> >   IN VOID       *StackSwitchData  OPTIONAL
> >   );
> >
> > Cc: Star Zeng <star.zeng@intel.com>
> > Cc: Eric Dong <eric.dong@intel.com>
> > Cc: Jiewen Yao <jiewen.yao@intel.com>
> > Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> > ---
> >  MdeModulePkg/Include/Library/CpuExceptionHandlerLib.h | 18
> > ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/MdeModulePkg/Include/Library/CpuExceptionHandlerLib.h
> > b/MdeModulePkg/Include/Library/CpuExceptionHandlerLib.h
> > index 6cd8230127..68de4850e1 100644
> > --- a/MdeModulePkg/Include/Library/CpuExceptionHandlerLib.h
> > +++ b/MdeModulePkg/Include/Library/CpuExceptionHandlerLib.h
> > @@ -41,6 +41,24 @@ InitializeCpuExceptionHandlers (
> >    IN EFI_VECTOR_HANDOFF_INFO       *VectorInfo OPTIONAL
> >    );
> >
> > +/**
> > +  Setup separate stack for given exceptions. StackSwitchData is optional and
> its
> > +  content depends one the specific arch of CPU.
> > +
> > +  @param[in] StackSwitchData      Pointer to data required for setuping up
> > +                                  stack switch.
> > +
> > +  @retval EFI_SUCCESS             The exceptions have been successfully
> > +                                  initialized.
> > +  @retval EFI_INVALID_PARAMETER   StackSwitchData contains invalid
> > content.
> > +
> > +**/
> > +EFI_STATUS
> > +EFIAPI
> > +InitializeCpuExceptionStackSwitchHandlers (
> > +  IN VOID       *StackSwitchData  OPTIONAL
> > +  );
> > +
> >  /**
> >    Initializes all CPU interrupt/exceptions entries and provides the default
> > interrupt/exception handlers.
> >
> > --
> > 2.14.1.windows.1
> >
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