[PATCH v5 04/20] arm64: boot protocol documentation update for GICv3
Marc Zyngier
marc.zyngier at arm.com
Thu Jun 19 02:19:27 PDT 2014
Linux has some requirements that must be satisfied in order to boot
on a system built with a GICv3.
Acked-by: Christoffer Dall <christoffer.dall at linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
Documentation/arm64/booting.txt | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index 37fc4f6..e28ccec 100644
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -141,6 +141,12 @@ 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, it is expected that:
+ - If EL3 is present, it must program ICC_SRE_EL3.Enable (bit 3) to
+ 0b1 and ICC_SRE_EL3.SRE (bit 0) to 0b1.
+ - If the kernel is entered at EL1, EL2 must set ICC_SRE_EL2.Enable
+ (bit 3) to 0b1 and ICC_SRE_EL2.SRE (bit 0) 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.
--
1.8.3.4
More information about the linux-arm-kernel
mailing list