audk/ArmVirtPkg/Library/ArmVirtMemoryInitPeiLib/ArmVirtMemoryInitPeiLib.c

/** @file
*
*  Copyright (c) 2011-2014, ARM Limited. All rights reserved.
*  Copyright (c) 2014, Linaro Limited. All rights reserved.
*
*  This program and the accompanying materials
*  are licensed and made available under the terms and conditions of the BSD License
*  which accompanies this distribution.  The full text of the license may be found at
*  http://opensource.org/licenses/bsd-license.php
*
*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*
**/

#include <PiPei.h>

#include <Library/ArmMmuLib.h>
#include <Library/ArmPlatformLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/CacheMaintenanceLib.h>

VOID
BuildMemoryTypeInformationHob (
  VOID
  );

VOID
InitMmu (
  VOID
  )
{
  ARM_MEMORY_REGION_DESCRIPTOR  *MemoryTable;
  VOID                          *TranslationTableBase;
  UINTN                         TranslationTableSize;
  RETURN_STATUS                 Status;

  // Get Virtual Memory Map from the Platform Library
  ArmPlatformGetVirtualMemoryMap (&MemoryTable);

  //Note: Because we called PeiServicesInstallPeiMemory() before to call InitMmu() the MMU Page Table resides in
  //      DRAM (even at the top of DRAM as it is the first permanent memory allocation)
  Status = ArmConfigureMmu (MemoryTable, &TranslationTableBase, &TranslationTableSize);
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "Error: Failed to enable MMU\n"));
  }
}

EFI_STATUS
EFIAPI
MemoryPeim (
  IN EFI_PHYSICAL_ADDRESS               UefiMemoryBase,
  IN UINT64                             UefiMemorySize
  )
{
  EFI_RESOURCE_ATTRIBUTE_TYPE ResourceAttributes;
  UINT64                      SystemMemoryTop;

  // Ensure PcdSystemMemorySize has been set
  ASSERT (PcdGet64 (PcdSystemMemorySize) != 0);

  //
  // Now, the permanent memory has been installed, we can call AllocatePages()
  //
  ResourceAttributes = (
      EFI_RESOURCE_ATTRIBUTE_PRESENT |
      EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
      EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
      EFI_RESOURCE_ATTRIBUTE_TESTED
  );

  SystemMemoryTop = PcdGet64 (PcdSystemMemoryBase) +
                    PcdGet64 (PcdSystemMemorySize);

  if (SystemMemoryTop - 1 > MAX_ADDRESS) {
    BuildResourceDescriptorHob (
        EFI_RESOURCE_SYSTEM_MEMORY,
        ResourceAttributes,
        PcdGet64 (PcdSystemMemoryBase),
        (UINT64)MAX_ADDRESS - PcdGet64 (PcdSystemMemoryBase) + 1
        );
    BuildResourceDescriptorHob (
        EFI_RESOURCE_SYSTEM_MEMORY,
        ResourceAttributes,
        (UINT64)MAX_ADDRESS + 1,
        SystemMemoryTop - MAX_ADDRESS - 1
        );
  } else {
    BuildResourceDescriptorHob (
        EFI_RESOURCE_SYSTEM_MEMORY,
        ResourceAttributes,
        PcdGet64 (PcdSystemMemoryBase),
        PcdGet64 (PcdSystemMemorySize)
        );
  }

  //
  // When running under virtualization, the PI/UEFI memory region may be
  // clean but not invalidated in system caches or in lower level caches
  // on other CPUs. So invalidate the region by virtual address, to ensure
  // that the contents we put there with the caches and MMU off will still
  // be visible after turning them on.
  //
  InvalidateDataCacheRange ((VOID*)(UINTN)UefiMemoryBase, UefiMemorySize);

  // Build Memory Allocation Hob
  InitMmu ();

  if (FeaturePcdGet (PcdPrePiProduceMemoryTypeInformationHob)) {
    // Optional feature that helps prevent EFI memory map fragmentation.
    BuildMemoryTypeInformationHob ();
  }

  return EFI_SUCCESS;
}