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-rw-r--r--Documentation/arm64/booting.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index 85af34d55cee..f3c05b5f9f08 100644
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -168,6 +168,14 @@ Before jumping into the kernel, the following conditions must be met:
the kernel image will be entered must be initialised by software at a
higher exception level to prevent execution in an UNKNOWN state.
+ For systems with a GICv3 interrupt controller:
+ - If EL3 is present:
+ ICC_SRE_EL3.Enable (bit 3) must be initialiased to 0b1.
+ ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b1.
+ - If the kernel is entered at EL1:
+ ICC.SRE_EL2.Enable (bit 3) must be initialised to 0b1
+ ICC_SRE_EL2.SRE (bit 0) must be initialised to 0b1.
+
The requirements described above for CPU mode, caches, MMUs, architected
timers, coherency and system registers apply to all CPUs. All CPUs must
enter the kernel in the same exception level.