Commit e24e03aa authored Apr 23, 2020 by Will Deacon

arm64: docs: Mandate that the I-cache doesn't hold stale kernel text



Although we require that the loaded kernel Image has been cleaned to the
PoC, we neglect to spell out the state of the I-cache. Although this
should be reasonably obvious, it doesn't hurt to be explicit.

Require that the I-cache doesn't hold any stale entries for the kernel
Image at boot.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200423093658.10602-1-will@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>

parent 6a8b55ed

Documentation/arm64/booting.rst

+2 −1

Original line number	Diff line number	Diff line
		@@ -173,7 +173,8 @@ Before jumping into the kernel, the following conditions must be met:
		- Caches, MMUs

		The MMU must be off.
		Instruction cache may be on or off.
		The instruction cache may be on or off, and must not hold any stale
		entries corresponding to the loaded kernel image.
		The address range corresponding to the loaded kernel image must be
		cleaned to the PoC. In the presence of a system cache or other
		coherent masters with caches enabled, this will typically require