[PATCH] bsps/raspberrypi: Add SEV Instruction for RPi SMP firmware changes.

[Gedare Bloom]

I think this looks fine. Joel, can you check it in?

On Wed, Aug 11, 2021 at 10:01 AM Pranav Dangi <dangipranav at gmail.com> wrote:
>
> ping
>
> On Mon, 9 Aug 2021, 16:43 pranav, <dangipranav at gmail.com> wrote:
>>
>> The Pi firmware added a wfe(wait for event), the cores 1-3 wait
>> for the start address being written to the mailbox register, followed
>> by a SEV poke to the mailbox that acts as a wfe wake-up event.
>> ---
>>  bsps/arm/raspberrypi/start/bspsmp.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/bsps/arm/raspberrypi/start/bspsmp.c b/bsps/arm/raspberrypi/start/bspsmp.c
>> index 44f7a1d376..9dcfb0fb03 100644
>> --- a/bsps/arm/raspberrypi/start/bspsmp.c
>> +++ b/bsps/arm/raspberrypi/start/bspsmp.c
>> @@ -42,6 +42,7 @@ bool _CPU_SMP_Start_processor( uint32_t cpu_index )
>>    if (cpu_index != cpu_index_self) {
>>
>>      BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + 0x10 * cpu_index) = (uint32_t)_start;
>> +    _ARM_Send_event();
>>
>>      /*
>>       * Wait for secondary processor to complete its basic initialization so
>> --
>> 2.30.2
>>
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