[PATCH] Cygwin: cpuid: add AArch64 build stubs

[Jon Turney]

On 16/07/2026 16:56, Jon Turney wrote:
> On 30/05/2026 17:03, Brian Inglis wrote:
>> On 2026-05-28 06:33, Jon Turney wrote:
>>> On 07/05/2026 11:45, Chandru Kumaresan wrote:
>>>> Hi Corinna,
>>>>
>>>> This patch adds ARM64 support for CPU information and cache 
>>>> detection used by /proc/cpuinfo and sysconf cache queries.
>>>> Thanks & regards,
>>>> K Chandru
>>>> In-lined patch:
>>>>
>>>> ---
>>>>   winsup/cygwin/fhandler/proc.cc       | 242 +++++++++++++++++++++++ 
>>>> ++++
>>>>   winsup/cygwin/local_includes/cpuid.h |  21 ++-
>>>>   winsup/cygwin/sysconf.cc             | 148 ++++++++++++++++
>>>>   3 files changed, 408 insertions(+), 3 deletions(-)
>>>
>>> Thanks.
>>>
>>> I don't have any substantive comments (apart from "oh, you're 
>>> supposed to grovel over a registry key to get the cpu information, 
>>> nice :(").
>>>
>>> Brian,
>>>
>>> I think you're much more familiar with this area of the code than me. 
>>> Please chime in if you have any comments!
>>
>> Thanks Jon,
>>
>> Never received the original patches in my email, so imported all from 
>> p- i, and will have a look soon, comparing against x86_64 and Linux- 
>> next x86 and arm64 cpufeature enumeration and cpuinfo output.
>>
>> It would be easier if MS Windows also exposed elevated CPU and MSR 
>> info to regular user space.
> 
> Brian,
> 
> Just a gentle ping to follow this up. Any comments or "looks good"?

Ping^2?