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target/arm: Add a core count property

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The cortex A53 TRM specifies that bits 24 and 25 of the L2CTLR register
specify the number of cores in the processor, not the total number of
cores in the system. To report this correctly on machines with multiple
CPU clusters (ARM's big.LITTLE or Xilinx's ZynqMP) we need to allow
the machine to overwrite this value. To do this let's add an optional
property.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Message-id: ef01d95c0759e88f47f22d11b14c91512a658b4f.1520018138.git.alistair.francis@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alistair Francis 2018-03-09 17:09:43 +00:00 • committed by Peter Maydell
parent b39b61e410
commit f9a697112e
3 changed files with 15 additions and 2 deletions
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6
target/arm/cpu.c
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@ -939,6 +939,11 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
cs->num_ases = 1;
}
cpu_address_space_init(cs, ARMASIdx_NS, "cpu-memory", cs->memory);
/* No core_count specified, default to smp_cpus. */
if (cpu->core_count == -1) {
cpu->core_count = smp_cpus;
}
#endif
qemu_init_vcpu(cs);
@ -1765,6 +1770,7 @@ static Property arm_cpu_properties[] = {
DEFINE_PROP_UINT64("mp-affinity", ARMCPU,
mp_affinity, ARM64_AFFINITY_INVALID),
DEFINE_PROP_INT32("node-id", ARMCPU, node_id, CPU_UNSET_NUMA_NODE_ID),
DEFINE_PROP_INT32("core-count", ARMCPU, core_count, -1),
DEFINE_PROP_END_OF_LIST()
};