linux-kernel - Re: [PATCH 1/3] ARM: MM: Add the workaround of Errata 774769

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Date:	Mon, 10 Dec 2012 00:08:25 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Boojin Kim <boojin.kim@...sung.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	'Will Deacon' <will.deacon@....com>,
	'Catalin Marinas' <Catalin.Marinas@....com>,
	'Kukjin Kim' <kgene.kim@...sung.com>
Subject: Re: [PATCH 1/3] ARM: MM: Add the workaround of Errata 774769

On Mon, Dec 10, 2012 at 08:58:35AM +0900, Boojin Kim wrote:
> 
> -3:	mov	r10, #0
> +	/* Cortex-A15 Errata */
> +3:	ldr	r10, =0x00000c0f		@ Cortex-A15 primary part number
> +	teq	r0, r10
> +	bne	4f
> +#ifdef CONFIG_ARM_ERRATA_774769

There's not much point testing for the part number of the work-around isn't
enabled.

> +	teq	r6, #0x4			@ present in r0p4
> +	mrceq	p15, 0, r10, c1, c0, 1		@ read aux control register

	tsteq	r10, #1 << 15

to avoid writing to the aux control register if the errata has already been
applied.

> +	orreq	r10, r10, #1 << 25		@ set bit #25
> +	mcreq	p15, 0, r10, c1, c0, 1		@ write aux control register
> +#endif
> +
> +4:	mov	r10, #0
>  	mcr	p15, 0, r10, c7, c5, 0		@ I+BTB cache invalidate
>  	dsb
>  #ifdef CONFIG_MMU
> --
> 1.7.5.4
> 
> 
> 
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