lkml.org 
[lkml]   [2019]   [Oct]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 2/2] arm64: Document ICC_CTLR_EL3.PMHE setting requirements
Date
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>
---
Documentation/arm64/booting.rst | 3 +++
1 file changed, 3 insertions(+)

diff --git a/Documentation/arm64/booting.rst b/Documentation/arm64/booting.rst
index d3f3a60fbf25..5d78a6f5b0ae 100644
--- a/Documentation/arm64/booting.rst
+++ b/Documentation/arm64/booting.rst
@@ -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.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:

--
2.20.1
\
 
 \ /
  Last update: 2019-10-02 11:07    [W:0.069 / U:11.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site