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arm64: Document ICC_CTLR_EL3.PMHE setting requirements

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It goes without saying, but better saying it: the kernel expects
ICC_CTLR_EL3.PMHE to have the same value across all CPUs, and
for that setting not to change during the lifetime of the kernel.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier 2019-10-02 10:06:13 +01:00 committed by Catalin Marinas
parent f226650494
commit 7e3a57fa6c
1 changed files with 3 additions and 0 deletions
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Documentation/arm64/booting.rst
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@ -213,6 +213,9 @@ Before jumping into the kernel, the following conditions must be met:
- ICC_SRE_EL3.Enable (bit 3) must be initialiased to 0b1. - ICC_SRE_EL3.Enable (bit 3) must be initialiased to 0b1.
- ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b1. - ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b1.
- ICC_CTLR_EL3.PMHE (bit 6) must be set to the same value across
all CPUs the kernel is executing on, and must stay constant
for the lifetime of the kernel.
- If the kernel is entered at EL1: - If the kernel is entered at EL1: