system76-edk2/ArmPlatformPkg/PrePeiCore/PrePeiCore.c

/** @file
  Main file supporting the transition to PEI Core in Normal World for Versatile Express

  Copyright (c) 2011 - 2022, ARM Limited. All rights reserved.

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Library/BaseLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugAgentLib.h>
#include <Library/ArmLib.h>
#include <Library/PrintLib.h>
#include <Library/SerialPortLib.h>

#include "PrePeiCore.h"

CONST EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI  mTemporaryRamSupportPpi = { PrePeiCoreTemporaryRamSupport };

CONST EFI_PEI_PPI_DESCRIPTOR  gCommonPpiTable[] = {
  {
    EFI_PEI_PPI_DESCRIPTOR_PPI,
    &gEfiTemporaryRamSupportPpiGuid,
    (VOID *)&mTemporaryRamSupportPpi
  }
};

VOID
CreatePpiList (
  OUT UINTN                   *PpiListSize,
  OUT EFI_PEI_PPI_DESCRIPTOR  **PpiList
  )
{
  EFI_PEI_PPI_DESCRIPTOR  *PlatformPpiList;
  UINTN                   PlatformPpiListSize;
  UINTN                   ListBase;
  EFI_PEI_PPI_DESCRIPTOR  *LastPpi;

  // Get the Platform PPIs
  PlatformPpiListSize = 0;
  ArmPlatformGetPlatformPpiList (&PlatformPpiListSize, &PlatformPpiList);

  // Copy the Common and Platform PPis in Temporary Memory
  ListBase = PcdGet64 (PcdCPUCoresStackBase);
  CopyMem ((VOID *)ListBase, gCommonPpiTable, sizeof (gCommonPpiTable));
  CopyMem ((VOID *)(ListBase + sizeof (gCommonPpiTable)), PlatformPpiList, PlatformPpiListSize);

  // Set the Terminate flag on the last PPI entry
  LastPpi         = (EFI_PEI_PPI_DESCRIPTOR *)ListBase + ((sizeof (gCommonPpiTable) + PlatformPpiListSize) / sizeof (EFI_PEI_PPI_DESCRIPTOR)) - 1;
  LastPpi->Flags |= EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST;

  *PpiList     = (EFI_PEI_PPI_DESCRIPTOR *)ListBase;
  *PpiListSize = sizeof (gCommonPpiTable) + PlatformPpiListSize;
}

/**

 Prints firmware version and build time to serial console.

**/
STATIC
VOID
PrintFirmwareVersion (
  VOID
  )
{
  CHAR8  Buffer[100];
  UINTN  CharCount;

  CharCount = AsciiSPrint (
                Buffer,
                sizeof (Buffer),
                "UEFI firmware (version %s built at %a on %a)\n\r",
                (CHAR16 *)PcdGetPtr (PcdFirmwareVersionString),
                __TIME__,
                __DATE__
                );
  SerialPortWrite ((UINT8 *)Buffer, CharCount);
}

VOID
CEntryPoint (
  IN  UINTN                     MpId,
  IN  EFI_PEI_CORE_ENTRY_POINT  PeiCoreEntryPoint
  )
{
  if (!ArmMmuEnabled ()) {
    // Data Cache enabled on Primary core when MMU is enabled.
    ArmDisableDataCache ();
    // Invalidate instruction cache
    ArmInvalidateInstructionCache ();
    // Enable Instruction Caches on all cores.
    ArmEnableInstructionCache ();

    InvalidateDataCacheRange (
      (VOID *)(UINTN)PcdGet64 (PcdCPUCoresStackBase),
      PcdGet32 (PcdCPUCorePrimaryStackSize)
      );
  }

  //
  // Note: Doesn't have to Enable CPU interface in non-secure world,
  // as Non-secure interface is already enabled in Secure world.
  //

  // Write VBAR - The Exception Vector table must be aligned to its requirement
  // Note: The AArch64 Vector table must be 2k-byte aligned - if this assertion fails ensure
  // 'Align=4K' is defined into your FDF for this module.
  ASSERT (((UINTN)PeiVectorTable & ARM_VECTOR_TABLE_ALIGNMENT) == 0);
  ArmWriteVBar ((UINTN)PeiVectorTable);

  // Enable Floating Point
  if (FixedPcdGet32 (PcdVFPEnabled)) {
    ArmEnableVFP ();
  }

  // Note: The MMU will be enabled by MemoryPeim. Only the primary core will have the MMU on.

  // If not primary Jump to Secondary Main
  if (ArmPlatformIsPrimaryCore (MpId)) {
    // Invoke "ProcessLibraryConstructorList" to have all library constructors
    // called.
    ProcessLibraryConstructorList ();

    PrintFirmwareVersion ();

    // Initialize the Debug Agent for Source Level Debugging
    InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, NULL, NULL);
    SaveAndSetDebugTimerInterrupt (TRUE);

    // Initialize the platform specific controllers
    ArmPlatformInitialize (MpId);

    // Goto primary Main.
    PrimaryMain (PeiCoreEntryPoint);
  } else {
    SecondaryMain (MpId);
  }

  // PEI Core should always load and never return
  ASSERT (FALSE);
}

EFI_STATUS
EFIAPI
PrePeiCoreTemporaryRamSupport (
  IN CONST EFI_PEI_SERVICES  **PeiServices,
  IN EFI_PHYSICAL_ADDRESS    TemporaryMemoryBase,
  IN EFI_PHYSICAL_ADDRESS    PermanentMemoryBase,
  IN UINTN                   CopySize
  )
{
  VOID   *OldHeap;
  VOID   *NewHeap;
  VOID   *OldStack;
  VOID   *NewStack;
  UINTN  HeapSize;

  HeapSize = ALIGN_VALUE (CopySize / 2, CPU_STACK_ALIGNMENT);

  OldHeap = (VOID *)(UINTN)TemporaryMemoryBase;
  NewHeap = (VOID *)((UINTN)PermanentMemoryBase + (CopySize - HeapSize));

  OldStack = (VOID *)((UINTN)TemporaryMemoryBase + HeapSize);
  NewStack = (VOID *)(UINTN)PermanentMemoryBase;

  //
  // Migrate the temporary memory stack to permanent memory stack.
  //
  CopyMem (NewStack, OldStack, CopySize - HeapSize);

  //
  // Migrate the temporary memory heap to permanent memory heap.
  //
  CopyMem (NewHeap, OldHeap, HeapSize);

  SecSwitchStack ((UINTN)NewStack - (UINTN)OldStack);

  return EFI_SUCCESS;
}