// When the firmware is built as not Standalone, the secondary cores need to wait the firmware
// entirely written into DRAM. It is the firmware from DRAM which will wake up the secondary cores.
VOID
NonSecureWaitForFirmware (
VOID
)
{
VOID (*secondary_start)(VOID);
// The secondary cores will execute the firmware once wake from WFI.
secondary_start = (VOID (*)())PcdGet32(PcdFvBaseAddress);
ArmCallWFI();
// Acknowledge the interrupt and send End of Interrupt signal.
ArmGicAcknowledgeInterrupt (PcdGet32(PcdGicDistributorBase), PcdGet32(PcdGicInterruptInterfaceBase), NULL, NULL);
// Jump to secondary core entry point.
secondary_start ();
// PEI Core should always load and never return
ASSERT (FALSE);
}
/*
* This is the main function for secondary cores. They loop around until a non Null value is written to
* SYS_FLAGS register.The SYS_FLAGS register is platform specific.
* Note:The secondary cores, while executing secondary_main, assumes that:
* : SGI 0 is configured as Non-secure interrupt
* : Priority Mask is configured to allow SGI 0
* : Interrupt Distributor and CPU interfaces are enabled
*
*/
VOID
EFIAPI
SecondaryMain (
IN UINTN MpId
)
{
EFI_STATUS Status;
UINTN PpiListSize;
UINTN PpiListCount;
EFI_PEI_PPI_DESCRIPTOR *PpiList;
ARM_MP_CORE_INFO_PPI *ArmMpCoreInfoPpi;
UINTN Index;
UINTN ArmCoreCount;
ARM_CORE_INFO *ArmCoreInfoTable;
UINT32 ClusterId;
UINT32 CoreId;
VOID (*SecondaryStart)(VOID);
UINTN SecondaryEntryAddr;
UINTN AcknowledgeInterrupt;
UINTN InterruptId;
ClusterId = GET_CLUSTER_ID(MpId);
CoreId = GET_CORE_ID(MpId);
// Get the gArmMpCoreInfoPpiGuid
PpiListSize = 0;
ArmPlatformGetPlatformPpiList (&PpiListSize, &PpiList);
PpiListCount = PpiListSize / sizeof(EFI_PEI_PPI_DESCRIPTOR);
for (Index = 0; Index < PpiListCount; Index++, PpiList++) {
if (CompareGuid (PpiList->Guid, &gArmMpCoreInfoPpiGuid) == TRUE) {
break;
}
}
// On MP Core Platform we must implement the ARM MP Core Info PPI
ASSERT (Index != PpiListCount);
ArmMpCoreInfoPpi = PpiList->Ppi;
ArmCoreCount = 0;
Status = ArmMpCoreInfoPpi->GetMpCoreInfo (&ArmCoreCount, &ArmCoreInfoTable);
ASSERT_EFI_ERROR (Status);
// Find the core in the ArmCoreTable
for (Index = 0; Index < ArmCoreCount; Index++) {
if ((ArmCoreInfoTable[Index].ClusterId == ClusterId) && (ArmCoreInfoTable[Index].CoreId == CoreId)) {
break;
}
}
// The ARM Core Info Table must define every core
ASSERT (Index != ArmCoreCount);
// Clear Secondary cores MailBox
MmioWrite32 (ArmCoreInfoTable[Index].MailboxClearAddress, ArmCoreInfoTable[Index].MailboxClearValue);
do {
ArmCallWFI ();
// Read the Mailbox
SecondaryEntryAddr = MmioRead32 (ArmCoreInfoTable[Index].MailboxGetAddress);
// Acknowledge the interrupt and send End of Interrupt signal.
AcknowledgeInterrupt = ArmGicAcknowledgeInterrupt (PcdGet32 (PcdGicInterruptInterfaceBase), &InterruptId);
// Check if it is a valid interrupt ID
if (InterruptId < ArmGicGetMaxNumInterrupts (PcdGet32 (PcdGicDistributorBase))) {
// Got a valid SGI number hence signal End of Interrupt
ArmGicEndOfInterrupt (PcdGet32 (PcdGicInterruptInterfaceBase), AcknowledgeInterrupt);
}
} while (SecondaryEntryAddr == 0);
// Jump to secondary core entry point.
SecondaryStart = (VOID (*)())SecondaryEntryAddr;
SecondaryStart();
// The secondaries shouldn't reach here
ASSERT(FALSE);
}