On 26/06/2019 00:22, Chris Johns wrote:
On 25/6/19 9:59 pm, Sebastian Huber wrote:
Can't you use the
B4.1.94 ID_PFR1, Processor Feature Register 1, VMSA
and test for the Virtualization Extensions?
This is a neater solution. Can I assume the ASID support part of the
virtualization extensions and op 3 is consistent?
I checked the manual again. We should use:
MPIDR, Multiprocessor Affinity Register
Configurations
This register is not implemented in architecture versions before ARMv7.
U, bit[30], in an implementation that includes the Multiprocessing
Extensions
Indicates a Uniprocessor system, as distinct from processor 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.
I am not sure if pre ARMv7-AR processors have this register.
It indicates the ID-ISA should help but I cannot see how to determine R vs A
from them.
It must be placed under the #if defined(__ARM_ARCH_7A__) scope.
--
Sebastian Huber, embedded brains GmbH
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