From: slash.tmp@free.fr (Mason)
To: linux-arm-kernel@lists.infradead.org
Subject: Trustzone: DSB before/after SMC
Date: Tue, 27 Oct 2015 14:31:38 +0100 [thread overview]
Message-ID: <562F7CBA.7060806@free.fr> (raw)
Hello,
I have a few questions about SMC. (I'm using Cortex-A9)
Platforms that use SMC often/always execute DSB beforehand.
1a) Is DSB required before SMC?
1b) Is DSB required after SMC?
2a) Is DSB required before returning to non-secure OS?
2b) Is DSB required after returning to non-secure OS?
3) Is this documented in the ARM ARM?
Bonus question: if DSB is required before SMC, why didn't ARM
make SMC implicitly do a DSB?
Regards.
next reply other threads:[~2015-10-27 13:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-27 13:31 Mason [this message]
2015-10-27 13:43 ` Trustzone: DSB before/after SMC Mark Rutland
2015-10-27 14:05 ` Mason
2015-10-27 14:37 ` Mark Rutland
2015-10-27 14:54 ` Måns Rullgård
2015-10-27 15:01 ` Mason
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