On Wed, 6 Mar 2019 at 06:44, Ni, Ray <ray...@intel.com> wrote:
>
> Ard, Leif,
> I am a bit interested in how ARM platform supports the MP?
> PI Spec defines below protocol but I failed to find a driver in ARM platform
> producing this protocol.
> Or did I miss anything?
>
No you are right. We don't expose that on ARM, since UEFI only runs on
a single core. Bringing up and taking down cores is done via a
protocol called PSCI, which is implemented by firmware running at a
higher privilege level.
So while it would be possible to implement the MP protocol on top of
PSCI, we haven't identified a use case for it yet. (The OS calls PSCI
directly to boot the secondary cores)
> typedef struct _EFI_MP_SERVICES_PROTOCOL {
> EFI_MP_SERVICES_GET_NUMBER_OF_PROCESSORS GetNumberOfProcessors;
> EFI_MP_SERVICES_GET_PROCESSOR_INFO GetProcessorInfo;
> EFI_MP_SERVICES_STARTUP_ALL_APS StartupAllAPs;
> EFI_MP_SERVICES_STARTUP_THIS_AP StartupThisAP;
> EFI_MP_SERVICES_SWITCH_BSP SwitchBSP;
> EFI_MP_SERVICES_ENABLEDISABLEAP EnableDisableAP;
> EFI_MP_SERVICES_WHOAMI WhoAmI;
> } EFI_MP_SERVICES_PROTOCOL;
>
> Thanks,
> Ray
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