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 <Library/ArmMPCoreMailBoxLib.h>
  19 #include <Chipset/ArmV7.h>
  20
  21 VOID
  22 PrimaryMain (
  23   IN  UINTN                     UefiMemoryBase,
  24   IN  UINTN                     StacksBase,
  25   IN  UINTN                     GlobalVariableBase,
  26   IN  UINT64                    StartTimeStamp
  27   )
  28 {
  29   // Enable the GIC Distributor
  30   ArmGicEnableDistributor(PcdGet32(PcdGicDistributorBase));
  31
  32   // In some cases, the secondary cores are waiting for an SGI from the next stage boot loader toresume their initialization
  33   if (!FixedPcdGet32(PcdSendSgiToBringUpSecondaryCores)) {
  34     // Sending SGI to all the Secondary CPU interfaces
  35     ArmGicSendSgiTo (PcdGet32(PcdGicDistributorBase), ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE, 0x0E);
  36   }
  37
  38   PrePiMain (UefiMemoryBase, StacksBase, GlobalVariableBase, StartTimeStamp);
  39
  40   // We must never return
  41   ASSERT(FALSE);
  42 }
  43
  44 VOID
  45 SecondaryMain (
  46   IN  UINTN                     MpId
  47   )
  48 {
  49   // Function pointer to Secondary Core entry point
  50   VOID (*secondary_start)(VOID);
  51   UINTN secondary_entry_addr=0;
  52
  53   // Clear Secondary cores MailBox
  54   ArmClearMPCoreMailbox();
  55
  56   while (secondary_entry_addr = ArmGetMPCoreMailbox(), secondary_entry_addr == 0) {
  57     ArmCallWFI();
  58     // Acknowledge the interrupt and send End of Interrupt signal.
  59     ArmGicAcknowledgeSgiFrom (PcdGet32(PcdGicInterruptInterfaceBase), PRIMARY_CORE_ID);
  60   }
  61
  62   secondary_start = (VOID (*)())secondary_entry_addr;
  63
  64   // Jump to secondary core entry point.
  65   secondary_start();
  66
  67   // The secondaries shouldn't reach here
  68   ASSERT(FALSE);
  69 }