[edk2-devel] "StdLibPkg" branch on edk2-staging

Thu Aug 5 04:14:43 UTC 2021

Hi all,

I plan to come back with the https://github.com/tianocore/edk2-staging/tree/CdePkg end of this year
and to unroll the source code of fundamental parts of my C Library and discuss that along
the 30. anniversary of “The C Book” https://publications.gbdirect.co.uk/c_book/chapter9

Additionally I will discuss the details you need to know:

  1.  about the differences C90/C95/C99 in language and library
  2.  how to get HOSTED ENVIRONMENT for UEFI POST drivers
  3.  how to get Intel/AMD TimeStampCounter based precise time calibration - platform,

processor  and chipset independent for x86 UEFI platforms

  1.  how to arrange space optimization for UEFI FW as an embedded platform
  2.  how to test and verify the compatibility of a Standard C Library implementation,

since “CI“ won’t help at all in this regards

  1.  how to implement a printf-core that performs narrow and wide mode at once for space optimization
  2.  how to implement a scanf-core that performs narrow and wide mode at once for space optimization
  3.  how to implement realloc() sub-allocator on UEFI memory management functions for PEI and DXE

Note: If UEFI is going to provide Standard-C-Functions for all drivers, you will have soon e.g. “sprintf()”
in all drivers. The amount of code for a proper sprintf() + scanf() + wscanf() + strtok() + wcstok() + malloc() … implementation
that is not tailored for embedded FW, will overrun the BIOS FLASH space instantly.
I consider commercial BIOS implementations that runs really many drivers (> 100) to start a platform.

Currently I implement more feature to CdePkg/Torito C Library:

  1.  Improve UEFI driver cross development for VisualStudio and EDK2
  2.  substitution of “DEBUG” traces by CdePkg-traces

that allows usage of predefined DEBUG-messages to run in a CdePkg-based driver.

Sole purpose is to have DEBUG/RELEASE mode _NOT_ globally, but locally to get

trace messages selectively for specific drivers only.

(to speed up POST with traces, that consumes a significant amount of time during

working hours of a BIOS developer)

  1.  add SMM support.

Shell, DXE, PEI (pre and post memory) is already available for 2 years:
https://edk2.groups.io/g/devel/message/51562?p=,,,20,0,0,0::Created,,CdePkg,20,2,0,65191785

  1.  get ACPICA tools https://acpica.org/ to UEFI Shell

I need to implement some non-standard / Microsoft specific C functions

to get that running for Andrew Fish.

That time links from https://github.com/KilianKegel are under construction and are
not necessarily  up-to-date.
Same for https://github.com/tianocore/edk2-staging/tree/CdePkg that is not used for long …

But https://github.com/KilianKegel/CdePkg.git driver set and sample set runs instantly
on the latest BIOS of a commercial vendor on a Intel IOTG TGL-H (Tiger Lake H) board using the Microsoft
build environment.

@Tim: I’d really appreciate if CdePkg could hold additionally Insyde BIOS support. Regrettably
I do not have access to Insyde source code.

@Maciej
I can not see any “wide” functions here. https://github.com/DevSolar/pdclib<https://github.com/DevSolar/pdclib%20from%20WCHAR.H>
from WCHAR.H or WCTYPE.H. That is a serious limitation in the UEFI environment.

To create UEFI-Shell programs for Personal Computers this link can be used.
https://github.com/KilianKegel/Visual-ANSI-C-for-UEFI-Shell#visual-ansi-c-for-uefi-shell

Best regards,
Kilian

From: Andrew Fish via groups.io<mailto:afish=apple.com at groups.io>
Sent: Thursday, August 5, 2021 05:35 AM
To: edk2-devel-groups-io<mailto:devel at edk2.groups.io>; Leif Lindholm<mailto:leif at nuviainc.com>
Cc: Rebecca Cran<mailto:rebecca at nuviainc.com>; tim.lewis at insyde.com<mailto:tim.lewis at insyde.com>; maciej.rabeda at linux.intel.com<mailto:maciej.rabeda at linux.intel.com>; Mike Kinney<mailto:michael.d.kinney at intel.com>
Subject: Re: [edk2-devel] "StdLibPkg" branch on edk2-staging

I’d guess I’d also ask the why not NewLib? Especially since Red Hat helps out with edk2….

Thanks,

Andrew Fish

> On Aug 4, 2021, at 4:03 AM, Leif Lindholm <leif at nuviainc.com> wrote:
>
> Hi Rebecca,
>
> I think the truth is we're a bit resigned about edk2-libc in general.
> My view is it should be either maintained or deprecated (or replaced).
>
> And maintainership *should* mean at least keeping it up to date with
> security fixes.
>
> I personally have no enthusiasm for the topic, but if there existed:
> - An up-to-date codebase.
> - A plan for keeping the coodbase up-to-date (as opposed to a plan to
>  keep the codebase up-to-date).
> - At least a couple of maintainers.
> I would have no objection to that existing under the TianoCore
> umbrella.
>
> Best Regards,
>
> Leif
>
> On Wed, Jul 28, 2021 at 16:44:02 -0600, Rebecca Cran wrote:
>> CC'ing the Tianocore stewards.
>>
>>
>> I've had problems getting a recent patch committed just to make edk2-libc
>> work against current edk2 master.
>>
>> Tianocore stewards: do we need new or additional maintainers for edk2-libc,
>> or is there a plan to deprecate it?
>>
>>
>> The current maintainers are listed as:
>>
>> StdLib, StdLibPrivateInternalFiles
>> W: https://github.com/tianocore/tianocore.github.io/wiki/StdLib
>> M: Daryl McDaniel <edk2-lists at mc2research.org>
>> M: Jaben Carsey <jaben.carsey at intel.com>
>>
>>
>> --
>> Rebecca Cran
>>
>>
>> On 7/28/21 4:25 PM, tim.lewis at insyde.com wrote:
>>> I would point out that there was significant work on libc in the
>> past (see https://github.com/andreiw/UefiToolsPkg) but never any
>> help to upstream these fixes, including making sure that many Linux
>> tools can easily be ported. I myself have used it to port several
>> BSD utilities over, but each time there will little nits with the
>> existing port and even small patches were returned with "no current
>> maintainer"
>>>
>>> In terms of making other projects use libc, I think the other
>>> objection was that it was never optimized for non-shell
>>> usage. Other projects (lie
>>> https://github.com/tianocore/edk2-staging/tree/CdePkg ) have tried
>>> to remedy this, but never with source checked in. But it allows
>>> support under PEI, DXE, etc.
>>>
>>> Tim
>>>
>>> -----Original Message-----
>>> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Rebecca Cran
>>> Sent: Wednesday, July 28, 2021 8:34 AM
>>> To: devel at edk2.groups.io; maciej.rabeda at linux.intel.com
>>> Subject: Re: [edk2-devel] "StdLibPkg" branch on edk2-staging
>>>
>>> Are you aware of the edk2-libc project at https://github.com/tianocore/edk2-libc ?
>>>
>>>
>
>
>
>
>

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