Hello Peng,
On 25/05/16 13:37, Peng Fan wrote:
On Wed, May 25, 2016 at 10:10:11AM +0800, Wei Chen wrote:
In ARM64, the MPIDR multiprocessing extensions bit is reserved to 1.
So, the value check for this bit is no longer necessary on ARM64.
From ARM DDI0487A.G, I found the U bit for MPIDR_EL1:
"
Indicates a Uniprocessor system, as distinct from PE 0 in a multiprocessor
system. The possible
values of this bit are:
0 Processor is part of a multiprocessor system.
1 Processor is part of a uniprocessor system.
"
It's not reserved to 1. Which doc are you refering to?
Please read carefully the patch. The check on MPDIR_EL1.U is kept, only
the check to the RES1 bit ('M' for Aarch32) is removed.
Regards,
--
Julien Grall
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