Genode region mapper

[Valery V. Sedletski]

On 20.01.2018 02:05, Valery V. Sedletski via genode-main wrote:
> Also, I'm wondering, are the stack area and the linker area still 
> implemented as managed dataspaces
> on base-linux? So, they are the same as on other platforms, but they 
> only couldn't be nested? (As I understand,
> dataspaces on Linux are not RPC objects indeed, so they are just 
> mmap-ped as a file in the same address space,
> that is the cause?).
>> For reference, you may take
>> a look at the handling of the stack area, which is a 256MiB-sized
>> virtual-address space window that is sparsely populated with the stacks
>> of the component-local threads.
>>
>> Cheers
>> Norman
>>
Looked at 
genode/repos/base-linux/src/include/base/internal/region_map_mmap.h, 
comments make this clear. So yes,
stack area is implemented as a managed dataspace. The limitations are 
that it cannot be attached twice, and cannot be attached to another 
managed dataspace. It still could be attached to the root region map. 
So, I'll be able to reserve the shared area as a managed dataspace. But 
still, I'll could not reserve sub-regions within it, for subsequent 
mappings/unmappings.
> WBR,
>
> valery
>
>
>
>
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