Re: [edk2-devel] Python-3.6.8 UEFI : fork support

["Jayaprakash, N via groups.io" <n.jayaprakash=intel.com@groups.io>]

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Hi Yoshinoya,

The MP Services UEFI protocol has been used to run the CPUID instructions on a given CPU core and to read / write the MSRs from given CPU core.
The python functions for this purpose are supported from the edk2module built in extension module are respectively cpuid_ex, rdmsr_ex/  wrmsr_ex with the function signatures as given below.

cupid_ex has the following signature cpuid_ex(cpu, eax, ecx) -> (eax:ebx:ecx:edx)
rdmsr_ex(cpu, msr) -> (lower_32bits, higher_32bits)
wrmsr_ex(cpu, msr, lower_32bits, higher_32bits) -> None

where the cpu parameter refers to the cpu core number starting from 0, 0 being BSP.

The usage instructions and code sample are not yet updated in the wiki. I can add more details at the earliest.

Please use the edk2-libc discussions page for any further questions / discussions.
https://github.com/tianocore/edk2-libc/discussions

Regards,
JP

From: Yoshinoya <yoshinoyatoko@163.com>
Sent: Monday, February 17, 2025 4:43 PM
To: devel@edk2.groups.io; Jayaprakash, N <n.jayaprakash@intel.com>
Cc: Kinney, Michael D <michael.d.kinney@intel.com>; pedro.falcato@gmail.com
Subject: Re:Re: [edk2-devel] Python-3.6.8 UEFI : fork support


hi, JP

Got it, thank you!



I found some uefi mp service functions's call sample in edk2module.c



So, user could follow this sample and write multi process sample with python script ?



best wishes,









At 2025-02-17 13:23:58, "Jayaprakash, N via groups.io" <n.jayaprakash=intel.com@groups.io<mailto:n.jayaprakash=intel.com@groups.io>> wrote:
Hi Yoshinoya,

It's not supported in UEFI.

You can see that macros are not defined as part of pyconfig.h
https://github.com/tianocore/edk2-libc/blob/master/AppPkg/Applications/Python/Python-3.6.8/PyMod-3.6.8/Include/pyconfig.h

So this functionality doesn't get compiled for UEFI.

Regards,
JP

From: Yoshinoya <yoshinoyatoko@163.com<mailto:yoshinoyatoko@163.com>>
Sent: Monday, February 17, 2025 8:19 AM
To: Kinney, Michael D <michael.d.kinney@intel.com<mailto:michael.d.kinney@intel.com>>; pedro.falcato@gmail.com<mailto:pedro.falcato@gmail.com>; devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Jayaprakash, N <n.jayaprakash@intel.com<mailto:n.jayaprakash@intel.com>>
Subject: [edk2-devel] Python-3.6.8 UEFI : fork support

Hi, Michael
I  am studying Python368 uefi code.
I have a question, ask for help.

I found some marco defines in edk2module.c
"HAVE_FORK / HAVE_FORK1 / HAVE_SPAWNV / etc"

It seems about multi-thread support functions,
so my question is:
1. Have these functions been tested on uefi shell environments?
2. Are there any code samples for study how to use them?

Thank you very much.

best wishes,



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