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Differential D34546

arm64: gic: disable the ITS if it's enabled prior to configuration
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Authored by kevans on Mar 14 2022, 4:46 AM.
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andrew
manu
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arm64
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rG1236b04bb704: arm64: gic: disable the ITS if it's enabled prior to configuration
Summary

The ITS is defined to be disabled on a warm reset, but we may be coming
in via another kernel/hypervisor type setup where the ITS has been
previously configured then relinquished to the next kernel in the chain.

If it's enabled, the later configuration of GITS_BASER will almost
certainly fail -- clear it to prevent that.

Sponsored by: Ampere Computing
Submitted by: Klara, Inc.

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rG FreeBSD src repository
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sys/
arm64/
arm64/
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sys/arm64/arm64/gicv3_its.c

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