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arm: Implement uniprocessor with MP config

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Add a boolean for indicating uniprocessors with MP extensions. This
drives the U bit in MPIDR. Prepares support for Cortex-R5.

Backports commit a8e81b319d1ae1224cc7059877dcdf04a5aad59d from qemu
This commit is contained in:
Peter Crosthwaite 2018-02-13 14:50:12 -05:00 committed by Lioncash
parent e8499a8f9b
commit 6f843a5484
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 7 additions and 2 deletions
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3
qemu/target-arm/cpu-qom.h
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@ -115,6 +115,9 @@ typedef struct ARMCPU {
/* KVM init features for this CPU */
uint32_t kvm_init_features[7];
/* Uniprocessor system with MP extensions */
bool mp_is_up;
/* The instance init functions for implementation-specific subclasses
* set these fields to specify the implementation-dependent values of
* various constant registers and reset values of non-constant

6
qemu/target-arm/helper.c
View file

@ -1795,9 +1795,11 @@ static uint64_t mpidr_read(CPUARMState *env, const ARMCPRegInfo *ri)
mpidr |= (1U << 31);
/* Cores which are uniprocessor (non-coherent)
* but still implement the MP extensions set
* bit 30. (For instance, A9UP.) However we do
* not currently model any of those cores.
* bit 30. (For instance, Cortex-R5).
*/
if (cpu->mp_is_up) {
mpidr |= (1u << 30);
}
}
return mpidr;
}