[edk2-devel] [Patch] ShellPkg/AcpiView: Fix IA32 link error

[Michael D Kinney]

Hi Sami,

I agree with your feedback.  I saw that there was a larger
patch set for the ShellPkg, so I let that complete before
returning to this topic.

The reason that I noticed this issue in the first place is
when I added the acpiview command to a platform and there
was an IA32 build failure.  It would be better if the ShellPkg
build caught this issue.  Adding the acpiview command to
the standard shell build adds 50K to an uncompressed DEBUG
IA32 build.

    869,312 Shell_7C04A583-9E3E-4f1c-AD65-E05268D0B4D1.efi
    920,928 Shell_EA4BB293-2D7F-4456-A681-1F22F42CD0BC.efi

Should acpiview be added to the standard ShellPkg build,
or should I add an extra build of the Shell to the 
ShellPkg DSC file with a different GUID to make sure
the shell builds when all NULL libs are included without
any !if statements.  For example:

  ShellPkg/Application/Shell/Shell.inf {
   <Defines>
      FILE_GUID = EA4BB293-2D7F-4456-A681-1F22F42CD0BC
    <PcdsFixedAtBuild>
      gEfiShellPkgTokenSpaceGuid.PcdShellLibAutoInitialize|FALSE
    <LibraryClasses>
      NULL|ShellPkg/Library/UefiShellLevel2CommandsLib/UefiShellLevel2CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellLevel1CommandsLib/UefiShellLevel1CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellLevel3CommandsLib/UefiShellLevel3CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellDriver1CommandsLib/UefiShellDriver1CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellInstall1CommandsLib/UefiShellInstall1CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellNetwork1CommandsLib/UefiShellNetwork1CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellNetwork2CommandsLib/UefiShellNetwork2CommandsLib.inf
      NULL|ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.inf
  }

Thanks,

Mike

> -----Original Message-----
> From: Sami Mujawar [mailto:Sami.Mujawar at arm.com]
> Sent: Thursday, July 11, 2019 1:24 AM
> To: devel at edk2.groups.io; Kinney, Michael D
> <michael.d.kinney at intel.com>
> Cc: Carsey, Jaben <jaben.carsey at intel.com>; Ni, Ray
> <ray.ni at intel.com>; Gao, Zhichao
> <zhichao.gao at intel.com>
> Subject: RE: [edk2-devel] [Patch] ShellPkg/AcpiView:
> Fix IA32 link error
> 
> Hi Mike,
> 
> Since LocalityCount is 64-bit wide the SLIT validation
> code could possibly end up in an infinite loop. I am
> not aware of a platform that has a large enough
> LocalityCount to hit this condition. However, would it
> be good to have a check that limits the validation to
> MAX_UINT32?
> 
> e.g. Something like
> if  (LocalityCount < MAX_UINT32) {
>   // Validate
>   for (Count = 0; Count < LocalityCount; Count++) {
>     for (Index = 0; Index < LocalityCount; Index++) {
>   ...
> } else {
>   Print (L"INFO: Skipping validation of System
> Localities as locality count is > MAX_UINT32\n"); }
> 
> Regards,
> 
> Sami Mujawar
> 
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On
> Behalf Of Michael D Kinney via Groups.Io
> Sent: 10 July 2019 11:35 PM
> To: devel at edk2.groups.io
> Cc: Jaben Carsey <jaben.carsey at intel.com>; Ray Ni
> <ray.ni at intel.com>; Zhichao Gao <zhichao.gao at intel.com>
> Subject: [edk2-devel] [Patch] ShellPkg/AcpiView: Fix
> IA32 link error
> 
> https://bugzilla.tianocore.org/show_bug.cgi?id=1970
> 
> Update local variable in ParseAcpiSlot() to be UINT32
> instead of UINT64 to avoid 64-bit multiply operation in
> the SLIT_ELEMENT() macro.
> 
> Cc: Jaben Carsey <jaben.carsey at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Zhichao Gao <zhichao.gao at intel.com>
> Signed-off-by: Michael D Kinney
> <michael.d.kinney at intel.com>
> ---
> 
> .../UefiShellAcpiViewCommandLib/Parsers/Slit/SlitParser
> .c     | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git
> a/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/
> Slit/SlitParser.c
> b/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/
> Slit/SlitParser.c
> index 1f9dac66ee..af85c9aa1c 100644
> ---
> a/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/
> Slit/SlitParser.c
> +++
> b/ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/
> Slit/SlitPars
> +++ er.c
> @@ -57,8 +57,8 @@ ParseAcpiSlit (
>    )
>  {
>    UINT32 Offset;
> -  UINT64 Count;
> -  UINT64 Index;
> +  UINT32 Count;
> +  UINT32 Index;
>    UINT64 LocalityCount;
>    UINT8* LocalityPtr;
>    CHAR16 Buffer[80];  // Used for AsciiName param of
> ParseAcpi
> --
> 2.21.0.windows.1
> 
> 
> 
> 
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