From: "Aneesh Kumar K.V" <aneesh.kumar@linux•vnet.ibm.com>
To: Phileas Fogg <phileas-fogg@mail•ru>,
Geoff Levand <geoff@infradead•org>,
linuxppc-dev@lists•ozlabs.org
Subject: Re: Re[3]: PS3 platform is broken on Linux 3.7.0
Date: Sun, 10 Feb 2013 21:41:37 +0530 [thread overview]
Message-ID: <87k3qg4092.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <1360487778.293641922@f350.mail.ru>
Phileas Fogg <phileas-fogg@mail•ru> writes:
> And another note.
> I took a look at the MMU chapter in the Cell Architecture handbook and in=
deed the first 15 bits in VA are treated as 0 by the hardware.
>
> Quote:
>
> 1. High-order bits above 65 bits in the 80-bit virtual address (VA[0:14])=
are not implemented. The hardware always
> =C2=A0=C2=A0 treats these bits as `0'. Software must not set these bits t=
o any other value than `0' or the results are undefined in
> =C2=A0=C2=A0 the PPE.
>
>
True, we missed the below part of ISA doc:
ISA doc says
"On implementations that support a virtual address size
of only n bits, n < 78, bits 0:77-n of the AVA field must be
zeros. "
The Cell document I found at=20
https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/7A77CCDF14FE70D58=
52575CA0074E8ED/$file/CellBE_Handbook_v1.12_3Apr09_pub.pdf
gives=20
Virtual Address (VA) Size -> 65 bits
So as per ISA, bits 0:12 should be zero, which should make 0:14 of PTE
fields zero for Cell.
I will try to do a patch.=20
Thanks for debugging this.
-aneesh
next prev parent reply other threads:[~2013-02-10 16:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-14 12:35 PS3 platform is broken on Linux 3.7.0 Phileas Fogg
2012-12-19 21:53 ` Benjamin Herrenschmidt
2013-01-12 2:12 ` Geoff Levand
2013-01-14 23:37 ` Geoff Levand
2013-02-10 8:59 ` Re[2]: " Phileas Fogg
2013-02-10 9:16 ` Re[3]: " Phileas Fogg
2013-02-10 16:11 ` Aneesh Kumar K.V [this message]
2013-02-11 10:26 ` Aneesh Kumar K.V
2013-02-11 16:57 ` Re[5]: " Phileas Fogg
2013-02-12 1:11 ` Re[3]: " Geoff Levand
2013-02-11 20:56 ` Re[2]: " Geoff Levand
2013-02-10 11:45 ` Phileas Fogg
2013-02-10 12:17 ` Re[3]: " Phileas Fogg
2013-02-10 15:46 ` Aneesh Kumar K.V
2013-02-10 17:51 ` Re[5]: " Phileas Fogg
2013-02-11 3:39 ` Michael Ellerman
2013-02-13 7:32 ` Geoff Levand
2013-02-13 22:37 ` Michael Ellerman
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