linux-kernel - Re: [PATCH v2 3/4] ARC: add support for DSP-enabled userspace applications

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Date:   Wed, 11 Mar 2020 19:13:28 +0000
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Alexey Brodkin" <Alexey.Brodkin@...opsys.com>
Subject: Re: [PATCH v2 3/4] ARC: add support for DSP-enabled userspace
 applications

On 3/5/20 12:02 PM, Eugeniy Paltsev wrote:
> To be able to run DSP-enabled userspace applications we need to
> save and restore following DSP-related registers:
> At IRQ/exception entry/exit:
>  * DSP_CTRL (save it and reset to value suitable for kernel)
>  * ACC0_LO, ACC0_HI (we already save them as r58, r59 pair)
> At context switch:
>  * ACC0_GLO, ACC0_GHI
>  * DSP_BFLY0, DSP_FFT_CTRL
> 
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>

Acked-by: Vineet Gupta <vgupta@...opsys.com>