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

[Joel Sherrill]

I just pushed this and the documentation patch is next in the queue.

Thanks.

--joel

On Tue, Aug 17, 2021 at 12:49 PM Pranav Dangi <dangipranav at gmail.com> wrote:
>
> ping
>
> On Wed, 11 Aug 2021, 21:36 Gedare Bloom, <gedare at rtems.org> wrote:
>>
>> 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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