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Message-ID: <386e02d5067da8e684332c5a788326ee@bootlin.com>
Date: Mon, 04 Jul 2022 19:34:02 +0200
From: clement.leger@...tlin.com
To: Claudiu.Beznea@...rochip.com
Cc: linux@...linux.org.uk, Nicolas.Ferre@...rochip.com,
alexandre.belloni@...tlin.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
thomas.petazzoni@...tlin.com
Subject: Re: [PATCH 1/2] ARM: at91: add sam_linux_is_in_normal_world()
function
Le 2022-07-04 08:19, Claudiu.Beznea@...rochip.com a écrit :
> Hi, Clement,
>
> On 06.06.2022 17:57, Clément Léger wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know
>> the content is safe
>>
>> Add sam_linux_is_in_normal_world() which allows to know if Linux is
>> running in the normal world or not. This function is used by code
>> which needs to differentiate the world in which Linux is running.
>>
>> Signed-off-by: Clément Léger <clement.leger@...tlin.com>
>> ---
>> arch/arm/mach-at91/sam_secure.c | 6 ++++++
>> arch/arm/mach-at91/sam_secure.h | 1 +
>> 2 files changed, 7 insertions(+)
>>
>> diff --git a/arch/arm/mach-at91/sam_secure.c
>> b/arch/arm/mach-at91/sam_secure.c
>> index 2a01f7a7d13f..1ec8c8b9d119 100644
>> --- a/arch/arm/mach-at91/sam_secure.c
>> +++ b/arch/arm/mach-at91/sam_secure.c
>> @@ -27,6 +27,12 @@ struct arm_smccc_res sam_smccc_call(u32 fn, u32
>> arg0, u32 arg1)
>> return res;
>> }
>>
>> +bool sam_linux_is_in_normal_world(void)
>> +{
>> + /* If optee has been detected, then we are running in normal
>> world */
>
> In case optee hasn't been detected don't we run also in normal world?
> What I want to say is that maybe you can change the function name to
> something like sam_linux_is_optee_available().
I would say it depends on the bootloader configuration, but Linux can
run
in secure world also. It would not change a lot of thing though.
However, you are right sam_linux_optee_is_available() seems easier to
understand ;)
Clément
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