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arm: Add has-mpu property

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For processors that support MPUs, add a property to de-feature it. This
is similar to the implementation of the EL3 feature.

The processor definition in init sets ARM_FEATURE_MPU if it can support
an MPU. post_init exposes the property, defaulting to true. If cleared
by the instantiator, ARM_FEATURE_MPU is then removed at realize time.

This is to support R profile processors that may or may-not have an MPU
configured.

Backports commit 8f325f568fbd0158cd413e7d637573ba90b3eaab from qemu
This commit is contained in:
Peter Crosthwaite 2018-02-13 14:52:38 -05:00 committed by Lioncash
parent 6f843a5484
commit 0299851aa0
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 7 additions and 0 deletions
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3
qemu/target-arm/cpu-qom.h
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@ -102,6 +102,9 @@ typedef struct ARMCPU {
/* CPU has security extension */
bool has_el3;
/* CPU has memory protection unit */
bool has_mpu;
/* PSCI conduit used to invoke PSCI methods
* 0 - disabled, 1 - smc, 2 - hvc
*/

4
qemu/target-arm/cpu.c
View file

@ -485,6 +485,10 @@ static int arm_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **err
cpu->id_aa64pfr0 &= ~0xf000;
}
if (!cpu->has_mpu) {
unset_feature(env, ARM_FEATURE_MPU);
}
if (arm_feature(env, ARM_FEATURE_EL3)) {
set_feature(env, ARM_FEATURE_VBAR);
}