Re: [PATCH v6 19/27] x86, boot: update comments about entries for64bit image

[H. Peter Anvin]

On 12/13/2012 04:51 PM, Yinghai Lu wrote:
> On Thu, Dec 13, 2012 at 4:44 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> > On Thu, Dec 13, 2012 at 4:38 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> > > On 12/13/2012 04:13 PM, Yinghai Lu wrote:
> > >
> > > It is definitely the minmum we can rely on, and so is the minimum we should
> > > rely on.  In fact, we don't even need .bss/.brk to be mapped, but we
> > > probably should require that as a matter of protocol.
> >
> > in my version of arch/x86/kernel/head_64.S is using BRK to do
> > ident/kernel high mapping
> > for kernel that is above 4G.
> > so .brk is needed.
>
> also need to make sure zero page and command line get ident mapping.
> because arch/x86/boot/compressed/head_64.S is using them.

... or we need to do the same kind of thing there.

	-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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