[PATCH] score: Add _CPU_Use_thread_local_storage()

[Sebastian Huber]

On 05/07/2022 00:33, Chris Johns wrote:
> On 4/7/2022 4:08 pm, Sebastian Huber wrote:
>> On 29/06/2022 15:07, Sebastian Huber wrote:
>>> At some point during system initialization, the idle threads are created.
>>> Afterwards, the boot processor basically executes within the context of an idle
>>> thread with thread dispatching disabled.  On some architectures, the
>>> thread-local storage area of the associated thread must be set in dedicated
>>> processor registers.  Add the new CPU port function to do this:
>>>
>>> void _CPU_Use_thread_local_storage( const Context_Control *context )
>>>
>>> Close #4672.
>>
>> Any comments to this patch?
> 
> I did wonder about the boot processor executing within the idle thread's context
> comment.
> 
> What code is the boot processor executing in the context of the idle thread?

The device driver initialization and creation of "/dev/console" is done 
in this context for example.

> 
> How does that execution effect the stack allocated to the idle thread?

The idle stack is not used. The system initialization uses the interrupt 
stacks.

> 
> I have always considered the idle thread's stack as small because it does nothing.
> 
> Chris

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