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| author | Will Deacon <will@kernel.org> | 2020-04-23 10:36:58 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-04-28 14:24:10 +0100 |
| commit | e24e03aa00f0248a716ec7859c03f0034bb42fb2 (patch) | |
| tree | 455fdeb82a08e3042bf70e5f9b243a4330e2f7f7 /Documentation/arm64/booting.rst | |
| parent | 6a8b55ed4056ea5559ebe4f6a4b247f627870d4c (diff) | |
| download | linux-e24e03aa00f0248a716ec7859c03f0034bb42fb2.tar.gz linux-e24e03aa00f0248a716ec7859c03f0034bb42fb2.tar.bz2 linux-e24e03aa00f0248a716ec7859c03f0034bb42fb2.zip | |
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>
Diffstat (limited to 'Documentation/arm64/booting.rst')
| -rw-r--r-- | Documentation/arm64/booting.rst | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/arm64/booting.rst b/Documentation/arm64/booting.rst index a3f1a47b6f1c..d063c05d5fb0 100644 --- a/Documentation/arm64/booting.rst +++ b/Documentation/arm64/booting.rst @@ -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 |