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Subject: Re: [PATCH v3 0/2] kexec-tools: arm64: Enable D-cache in purgatory
References: <cover.1495514291.git.panand@redhat.com> <59312080.1090906@arm.com>
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From: Pratyush Anand <panand@redhat.com>
Message-ID: <2b80fca3-b462-a1b5-36db-e8b8b8fdc126@redhat.com>
Date: Fri, 2 Jun 2017 20:02:25 +0530
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To: Ard Biesheuvel <ard.biesheuvel@linaro.org>, Bhupesh SHARMA <bhupesh.linux@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>, Baoquan He <bhe@redhat.com>, "kexec@lists.infradead.org" <kexec@lists.infradead.org>, Simon Horman <horms@verge.net.au>, James Morse <james.morse@arm.com>, Dave Young <dyoung@redhat.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>

Hi Ard,

Thanks for all the inputs.

On Friday 02 June 2017 05:14 PM, Ard Biesheuvel wrote:
>> Alternatively, a SHA-256 implementation that uses movz/movk sequences
>> instead of ldr instructions to load the round constants would already
>> be 5x faster, given that we don't need page tables to enable the
>> I-cache.
> Actually, looking at the C code and the objdump of the kernel's
> sha256_generic driver, it is likely that it is already doing this, and
> none of the points I made actually make a lot of sense ...
>
> Pratyush: I assume you are already enabling the I-cache in the purgatory?

It's not enabled yet. But, I had tried first with enabling only I-cache, but 
that did not make much difference in execution time.

~Pratyush



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