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From: Mark Rutland <mark.rutland@arm.com>
To: Andre Przywara <andre.przywara@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, Jaxson Han <jaxson.han@arm.com>
Subject: Re: [boot-wrapper PATCH v2 7/9] pointer auth: Document CPU feature bit mask
Date: Fri, 7 Jan 2022 14:15:16 +0000	[thread overview]
Message-ID: <YdhK9Lkg2kL/zhbV@FVFF77S0Q05N> (raw)
In-Reply-To: <20211222181607.1203191-8-andre.przywara@arm.com>

On Wed, Dec 22, 2021 at 06:16:05PM +0000, Andre Przywara wrote:
> When checking for the pointer authentication feature, we actually look
> for *four* different CPUID feature sets.
> Add a comment to make it more obvious that the 0xff is not a typo.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Thanks; applied.

Mark.

> ---
>  arch/aarch64/boot.S | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/aarch64/boot.S b/arch/aarch64/boot.S
> index bfbb6ec..27ba449 100644
> --- a/arch/aarch64/boot.S
> +++ b/arch/aarch64/boot.S
> @@ -38,7 +38,8 @@ ASM_FUNC(_start)
>  
>  	/* Enable pointer authentication if present */
>  	mrs	x1, id_aa64isar1_el1
> -	ldr	x2, =(((0xff) << 24) | (0xff << 4))
> +	/* We check for APA+API and GPA+GPI */
> +	ldr	x2, =((0xff << 24) | (0xff << 4))
>  	and	x1, x1, x2
>  	cbz	x1, 1f
>  
> -- 
> 2.25.1
> 

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  reply	other threads:[~2022-01-07 14:16 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-22 18:15 [boot-wrapper PATCH v2 0/9] Various (build system) fixes Andre Przywara
2021-12-22 18:15 ` [boot-wrapper PATCH v2 1/9] Makefile: Avoid .got section creation Andre Przywara
2022-01-07 13:49   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 2/9] Add standard headers Andre Przywara
2022-01-07 13:49   ` Mark Rutland
2022-01-07 14:31     ` Andre Przywara
2022-01-11 11:34       ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 3/9] Makefile: Tell compiler to generate bare-metal code Andre Przywara
2022-01-07 13:53   ` Mark Rutland
2022-01-07 14:38     ` Andre Przywara
2022-01-11 11:30       ` Mark Rutland
2022-01-18 12:52         ` Andre Przywara
2022-01-18 14:10           ` Ard Biesheuvel
2021-12-22 18:16 ` [boot-wrapper PATCH v2 4/9] configure: Make PSCI the default boot method Andre Przywara
2022-01-07 14:12   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 5/9] configure: Fix default DTB Andre Przywara
2022-01-07 14:13   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 6/9] configure: Use earlycon instead of earlyprintk Andre Przywara
2022-01-07 14:01   ` Mark Rutland
2022-01-07 14:14     ` Mark Rutland
2022-01-07 14:47     ` Andre Przywara
2021-12-22 18:16 ` [boot-wrapper PATCH v2 7/9] pointer auth: Document CPU feature bit mask Andre Przywara
2022-01-07 14:15   ` Mark Rutland [this message]
2021-12-22 18:16 ` [boot-wrapper PATCH v2 8/9] configure: Autodetect GICv3 Andre Przywara
2022-01-07 14:19   ` Mark Rutland
2021-12-22 18:16 ` [boot-wrapper PATCH v2 9/9] avoid dtc warnings on re-compiling DTB Andre Przywara
2022-01-07 13:59   ` Mark Rutland
2022-01-13 18:42   ` Vladimir Murzin
2022-01-13 19:50     ` Andre Przywara
2022-01-14  8:35       ` Vladimir Murzin
2022-01-14 10:44         ` Mark Rutland
2022-01-14 12:09           ` Andre Przywara
2022-01-19 12:02             ` Mark Rutland
2022-01-07 14:25 ` [boot-wrapper PATCH v2 0/9] Various (build system) fixes Mark Rutland

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