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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.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: a70a80583df265e0174f01fa1fc92b33ea6d1db5.1434066412.git.peter.crosthwaite@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Crosthwaite 2015-06-15 18:06:10 +01:00 committed by Peter Maydell
parent b7cc4e82f0
commit a8e81b319d
2 changed files with 7 additions and 2 deletions
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3
target-arm/cpu-qom.h
View File

@ -116,6 +116,9 @@ 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
target-arm/helper.c
View File

@ -2075,9 +2075,11 @@ 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;
}