lkml.org 
[lkml]   [2017]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3] arm64: cpuinfo: display product info in /proc/cpuinfo
Hi,

On Wed, Sep 27, 2017 at 11:42:07AM +0100, Robin Murphy wrote:
> On 26/09/17 23:23, Al Stone wrote:
> > + seq_printf(m, ", ARM 8.%d (r%dp%d) CPU",
> > + MIDR_VARIANT(midr),
> > + MIDR_VARIANT(midr),
> > + MIDR_REVISION(midr));
>
> What is "ARM 8.1" meant to infer for, say, a typical Cortex-A57?

Just to make Robin's point a little clearer, MIDR_EL1.Variant is
IMPLEMENTATION DEFINED, and doesn't describe the ARMv8.x architecture
revision.

For example, on Cortex A57 is contains the major revision number of the
CPU, and is 1 for any r1pY Cortex-A57 (e.g. those on Juno R1).

For better or worse, the architecture provides us no mechanism to
determine the architecture revision.

Thanks,
Mark.

\
 
 \ /
  Last update: 2017-09-27 15:42    [W:0.092 / U:0.468 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site