arm64: head.S: document the use of callee saved registers

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Now that the only remaining occurrences of the use of callee saved
registers are on the primary boot path, add a comment to the code
which register is used for what.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Ard Biesheuvel 2016-08-31 12:05:17 +01:00 • committed by Will Deacon

parent 60699ba18b

commit a9be2ee093

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