What does rmo/tce stand for in powerpc?

What does rmo/tce stand for in powerpc?

[Ryan Wang]

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Hi,

In kernel source comments, I saw the words:
''

alloc_top is set to the top of RMO, eventually shrink down if the
<http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972>TCEs
overlap

''

I wonder what does RMO mean, and TCE?

thanks,

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Re: What does rmo/tce stand for in powerpc?

[Nishanth Aravamudan]

Hi Ryan,

On 01.11.2011 [14:25:43 +0800], Ryan Wang wrote:
> Hi,
> 
> In kernel source comments, I saw the words:
> ''
> 
> alloc_top is set to the top of RMO, eventually shrink down if the
> <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972>TCEs
> overlap
> 
> ''
> 
> I wonder what does RMO mean, and TCE?

RMO = Real Mode Offset -- deprecated in terms of Real Mode Area in PAPR.

TCE = Translation Control Entry

You should be able to find descriptions of both in PAPR.

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center

Re: What does rmo/tce stand for in powerpc?

[Ryan Wang]

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2011/11/2 Nishanth Aravamudan <nacc@us.ibm.com>

> Hi Ryan,
>
> On 01.11.2011 [14:25:43 +0800], Ryan Wang wrote:
> > Hi,
> >
> > In kernel source comments, I saw the words:
> > ''
> >
> > alloc_top is set to the top of RMO, eventually shrink down if the
> > <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972>TCEs
> > overlap
> >
> > ''
> >
> > I wonder what does RMO mean, and TCE?
>
> RMO = Real Mode Offset -- deprecated in terms of Real Mode Area in PAPR.
>
> TCE = Translation Control Entry
>
> You should be able to find descriptions of both in PAPR.
>

Thanks Nish!

But I searched <Power.orgTM Standard for Embedded Power ArchitectureTM
Platform Requirements> and failed to found the concept RMO or Real Mode
Offset.

Will you please give me some hints to the docs？Thanks,



>
> Thanks,
> Nish
>
> --
> Nishanth Aravamudan <nacc@us.ibm.com>
> IBM Linux Technology Center
>
>

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Re: What does rmo/tce stand for in powerpc?

[Nishanth Aravamudan]

On 02.11.2011 [19:17:20 +0800], Ryan Wang wrote:
> 2011/11/2 Nishanth Aravamudan <nacc@us.ibm.com>
> 
> > Hi Ryan,
> >
> > On 01.11.2011 [14:25:43 +0800], Ryan Wang wrote:
> > > Hi,
> > >
> > > In kernel source comments, I saw the words:
> > > ''
> > >
> > > alloc_top is set to the top of RMO, eventually shrink down if the
> > > <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972>TCEs
> > > overlap
> > >
> > > ''
> > >
> > > I wonder what does RMO mean, and TCE?
> >
> > RMO = Real Mode Offset -- deprecated in terms of Real Mode Area in PAPR.
> >
> > TCE = Translation Control Entry
> >
> > You should be able to find descriptions of both in PAPR.
> >
> 
> Thanks Nish!
> 
> But I searched <Power.orgTM Standard for Embedded Power ArchitectureTM
> Platform Requirements> and failed to found the concept RMO or Real Mode
> Offset.
> 
> Will you please give me some hints to the docs??Thanks,

Section 14.1.1 Real Mode Accesses in PAPR 2.4

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center

Re: What does rmo/tce stand for in powerpc?

[Scott Wood]

On 11/02/2011 06:17 AM, Ryan Wang wrote:
>=20
>=20
> 2011/11/2 Nishanth Aravamudan <nacc@us.ibm.com <mailto:nacc@us.ibm.com>=
>
>=20
>     Hi Ryan,
>=20
>     On 01.11.2011 [14:25:43 +0800], Ryan Wang wrote:
>     > Hi,
>     >
>     > In kernel source comments, I saw the words:
>     > ''
>     >
>     > alloc_top is set to the top of RMO, eventually shrink down if the
>     > <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972
>     <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972>>=
TCEs
>     > overlap
>     >
>     > ''
>     >
>     > I wonder what does RMO mean, and TCE?
>=20
>     RMO =3D Real Mode Offset -- deprecated in terms of Real Mode Area i=
n PAPR.
>=20
>     TCE =3D Translation Control Entry
>=20
>     You should be able to find descriptions of both in PAPR.
>=20
>=20
> Thanks Nish!
>=20
> But I searched <Power.orgTM Standard for Embedded Power ArchitectureTM
> Platform Requirements> and failed to found the concept RMO or Real Mode
> Offset.
>=20
> Will you please give me some hints to the docs=EF=BC=9FThanks,

ePAPR and PAPR are not the same thing.

It looks like PAPR is only available to power.org members.

-Scott

Re: What does rmo/tce stand for in powerpc?

[Ryan Wang]

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2011/11/3 Scott Wood <scottwood@freescale.com>

> On 11/02/2011 06:17 AM, Ryan Wang wrote:
> >
> >
> > 2011/11/2 Nishanth Aravamudan <nacc@us.ibm.com <mailto:nacc@us.ibm.com>>
> >
> >     Hi Ryan,
> >
> >     On 01.11.2011 [14:25:43 +0800], Ryan Wang wrote:
> >     > Hi,
> >     >
> >     > In kernel source comments, I saw the words:
> >     > ''
> >     >
> >     > alloc_top is set to the top of RMO, eventually shrink down if the
> >     > <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972
> >     <http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972
> >>TCEs
> >     > overlap
> >     >
> >     > ''
> >     >
> >     > I wonder what does RMO mean, and TCE?
> >
> >     RMO = Real Mode Offset -- deprecated in terms of Real Mode Area in
> PAPR.
> >
> >     TCE = Translation Control Entry
> >
> >     You should be able to find descriptions of both in PAPR.
> >
> >
> > Thanks Nish!
> >
> > But I searched <Power.orgTM Standard for Embedded Power ArchitectureTM
> > Platform Requirements> and failed to found the concept RMO or Real Mode
> > Offset.
> >
> > Will you please give me some hints to the docs？Thanks,
>
> ePAPR and PAPR are not the same thing.
>
> It looks like PAPR is only available to power.org members.
>

Got it. Thanks, Nish.


>
> -Scott
>
>

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