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Re: [PATCH v3 07/28] arm64/sve: Low-level SVE architectural state manipulation functions
- From: Catalin Marinas <catalin dot marinas at arm dot com>
- To: Dave Martin <Dave dot Martin at arm dot com>
- Cc: linux-arm-kernel at lists dot infradead dot org, linux-arch at vger dot kernel dot org, Okamoto Takayuki <tokamoto at jp dot fujitsu dot com>, libc-alpha at sourceware dot org, Ard Biesheuvel <ard dot biesheuvel at linaro dot org>, Szabolcs Nagy <szabolcs dot nagy at arm dot com>, Will Deacon <will dot deacon at arm dot com>, Richard Sandiford <richard dot sandiford at arm dot com>, Alex Bennée <alex dot bennee at linaro dot org>, kvmarm at lists dot cs dot columbia dot edu
- Date: Wed, 11 Oct 2017 15:28:19 +0100
- Subject: Re: [PATCH v3 07/28] arm64/sve: Low-level SVE architectural state manipulation functions
- Authentication-results: sourceware.org; auth=none
- References: <1507660725-7986-1-git-send-email-Dave.Martin@arm.com> <1507660725-7986-8-git-send-email-Dave.Martin@arm.com>
On Tue, Oct 10, 2017 at 07:38:24PM +0100, Dave P Martin wrote:
> Manipulating the SVE architectural state, including the vector and
> predicate registers, first-fault register and the vector length,
> requires the use of dedicated instructions added by SVE.
>
> This patch adds suitable assembly functions for saving and
> restoring the SVE registers and querying the vector length.
> Setting of the vector length is done as part of register restore.
>
> Since people building kernels may not all get an SVE-enabled
> toolchain for a while, this patch uses macros that generate
> explicit opcodes in place of assembler mnemonics.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
(not adding reviewed-by as I haven't checked the instruction encodings,
I just trust you to be correct ;))