Re: [Minios-devel] [UNIKRAFT PATCHv4 18/43] plat/include: Define address offsets of boot stack and pagetable

[Julien Grall <julien.grall@xxxxxxx>]

On 09/07/18 11:10, Wei Chen wrote:
> Hi Julien,
Hi Wei,


> > -----Original Message-----
> > From: Julien Grall <julien.grall@xxxxxxx>
> > Sent: 2018年7月9日 4:19
> > To: Wei Chen <Wei.Chen@xxxxxxx>; minios-devel@xxxxxxxxxxxxxxxxxxxx;
> > simon.kuenzer@xxxxxxxxx
> > Cc: Kaly Xin <Kaly.Xin@xxxxxxx>; nd <nd@xxxxxxx>
> > Subject: Re: [Minios-devel] [UNIKRAFT PATCHv4 18/43] plat/include: Define
> > address offsets of boot stack and pagetable
> >
> > Hi Wei,
> >
> > On 07/06/2018 10:03 AM, Wei Chen wrote:
> > > If we place the boot stack and pagetable in BSS section. These
> > > areas are not easy to be reused after changing to newstack. So
> > s/newstack/a new stack/ or "the new stack".
>
> Ok
>
> > > in Arm64, we want to place the pagetable and boot stack behind
> > s/behind/after/
> Got it.
>
> > > the end of image.
> > > In this case, once we change to newstack or we have new pagetable,
> > > these two areas can be reclaimed very easy.
> > I am wondering whether it would be worth to introduce an "init" section.
> > This would make easier to reclaim the region and avoid hardcoded offset
> > below.
> If we have a lot of such init functions or data, it would be good to have
> a init section. If not, the freed small init section it's not easy managed.
> Because VA and PA is 1:1 mapped.
I am not sure to understand how this would be difficult to manage? The 
region will be few tens KB. This is enough to allocate a lot of structure.
Cheers,

--
Julien Grall

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