ArmPlatformPkg/PrePi/MainMPCore.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include "PrePi.h"
  16
  17 #include <Library/ArmGicLib.h>
  18 #include <Chipset/ArmV7.h>
  19
  20 VOID
  21 PrimaryMain (
  22   IN  UINTN                     UefiMemoryBase,
  23   IN  UINTN                     StacksBase,
  24   IN  UINTN                     GlobalVariableBase,
  25   IN  UINT64                    StartTimeStamp
  26   )
  27 {
  28   // Enable the GIC Distributor
  29   ArmGicEnableDistributor(PcdGet32(PcdGicDistributorBase));
  30
  31   // In some cases, the secondary cores are waiting for an SGI from the next stage boot loader toresume their initialization
  32   if (!FixedPcdGet32(PcdSendSgiToBringUpSecondaryCores)) {
  33     // Sending SGI to all the Secondary CPU interfaces
  34     ArmGicSendSgiTo (PcdGet32(PcdGicDistributorBase), ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE, 0x0E);
  35   }
  36
  37   PrePiMain (UefiMemoryBase, StacksBase, GlobalVariableBase, StartTimeStamp);
  38
  39   // We must never return
  40   ASSERT(FALSE);
  41 }
  42
  43 VOID
  44 SecondaryMain (
  45   IN  UINTN                     MpId
  46   )
  47 {
  48   // Function pointer to Secondary Core entry point
  49   VOID (*secondary_start)(VOID);
  50   UINTN secondary_entry_addr=0;
  51
  52   // Clear Secondary cores MailBox
  53   ArmClearMPCoreMailbox();
  54
  55   while (secondary_entry_addr = ArmGetMPCoreMailbox(), secondary_entry_addr == 0) {
  56     ArmCallWFI();
  57     // Acknowledge the interrupt and send End of Interrupt signal.
  58     ArmGicAcknowledgeSgiFrom (PcdGet32(PcdGicInterruptInterfaceBase), PRIMARY_CORE_ID);
  59   }
  60
  61   secondary_start = (VOID (*)())secondary_entry_addr;
  62
  63   // Jump to secondary core entry point.
  64   secondary_start();
  65
  66   // The secondaries shouldn't reach here
  67   ASSERT(FALSE);
  68 }