linux-kernel - Re: [PATCH 3/5] ARC: handle DSP presence in HW

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Date:   Tue, 7 Jan 2020 01:30:18 +0000
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] ARC: handle DSP presence in HW

On 1/6/20 5:03 PM, Vineet Gupta wrote:
>
>> +.macro DSP_SAVE_REGFILE_IRQ
>> +#if defined(CONFIG_ARC_DSP_KERNEL)
>> +	/* Drop any changes to DSP_CTRL made by userspace so userspace won't be
>> +	 * able to break kernel */
>> +	mov	r58, DSP_CTRL_DISABLED_ALL
>> +	sr	r58, [ARC_AUX_DSP_CTRL]
>

This also clears the sticky flag DSP_CTRL.SAT, can you check with DSP lib folks if
they rely on this bit in any way whatsoever !