system76-edk2/ArmPlatformPkg/MemoryInitPei/MemoryInitPeiLib.c

/** @file

  Copyright (c) 2011-2015, ARM Limited. All rights reserved.

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

**/

#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>

VOID
BuildMemoryTypeInformationHob (
  VOID
  );

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

  // 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 ((DEBUG_ERROR, "Error: Failed to enable MMU\n"));
  }
}

/*++

Routine Description:



Arguments:

  FileHandle  - Handle of the file being invoked.
  PeiServices - Describes the list of possible PEI Services.

Returns:

  Status -  EFI_SUCCESS if the boot mode could be set

--*/
EFI_STATUS
EFIAPI
MemoryPeim (
  IN EFI_PHYSICAL_ADDRESS  UefiMemoryBase,
  IN UINT64                UefiMemorySize
  )
{
  ARM_MEMORY_REGION_DESCRIPTOR  *MemoryTable;
  EFI_RESOURCE_ATTRIBUTE_TYPE   ResourceAttributes;
  UINT64                        ResourceLength;
  EFI_PEI_HOB_POINTERS          NextHob;
  EFI_PHYSICAL_ADDRESS          FdTop;
  EFI_PHYSICAL_ADDRESS          SystemMemoryTop;
  EFI_PHYSICAL_ADDRESS          ResourceTop;
  BOOLEAN                       Found;

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

  // 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_COMBINEABLE |
                        EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
                        EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
                        EFI_RESOURCE_ATTRIBUTE_TESTED
                        );

  //
  // Check if the resource for the main system memory has been declared
  //
  Found       = FALSE;
  NextHob.Raw = GetHobList ();
  while ((NextHob.Raw = GetNextHob (EFI_HOB_TYPE_RESOURCE_DESCRIPTOR, NextHob.Raw)) != NULL) {
    if ((NextHob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) &&
        (PcdGet64 (PcdSystemMemoryBase) >= NextHob.ResourceDescriptor->PhysicalStart) &&
        (NextHob.ResourceDescriptor->PhysicalStart + NextHob.ResourceDescriptor->ResourceLength <= PcdGet64 (PcdSystemMemoryBase) + PcdGet64 (PcdSystemMemorySize)))
    {
      Found = TRUE;
      break;
    }

    NextHob.Raw = GET_NEXT_HOB (NextHob);
  }

  if (!Found) {
    // Reserved the memory space occupied by the firmware volume
    BuildResourceDescriptorHob (
      EFI_RESOURCE_SYSTEM_MEMORY,
      ResourceAttributes,
      PcdGet64 (PcdSystemMemoryBase),
      PcdGet64 (PcdSystemMemorySize)
      );
  }

  //
  // Reserved the memory space occupied by the firmware volume
  //

  SystemMemoryTop = (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdSystemMemoryBase) + (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdSystemMemorySize);
  FdTop           = (EFI_PHYSICAL_ADDRESS)PcdGet64 (PcdFdBaseAddress) + (EFI_PHYSICAL_ADDRESS)PcdGet32 (PcdFdSize);

  // EDK2 does not have the concept of boot firmware copied into DRAM. To avoid the DXE
  // core to overwrite this area we must create a memory allocation HOB for the region,
  // but this only works if we split off the underlying resource descriptor as well.
  if ((PcdGet64 (PcdFdBaseAddress) >= PcdGet64 (PcdSystemMemoryBase)) && (FdTop <= SystemMemoryTop)) {
    Found = FALSE;

    // Search for System Memory Hob that contains the firmware
    NextHob.Raw = GetHobList ();
    while ((NextHob.Raw = GetNextHob (EFI_HOB_TYPE_RESOURCE_DESCRIPTOR, NextHob.Raw)) != NULL) {
      if ((NextHob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) &&
          (PcdGet64 (PcdFdBaseAddress) >= NextHob.ResourceDescriptor->PhysicalStart) &&
          (FdTop <= NextHob.ResourceDescriptor->PhysicalStart + NextHob.ResourceDescriptor->ResourceLength))
      {
        ResourceAttributes = NextHob.ResourceDescriptor->ResourceAttribute;
        ResourceLength     = NextHob.ResourceDescriptor->ResourceLength;
        ResourceTop        = NextHob.ResourceDescriptor->PhysicalStart + ResourceLength;

        if (PcdGet64 (PcdFdBaseAddress) == NextHob.ResourceDescriptor->PhysicalStart) {
          if (SystemMemoryTop != FdTop) {
            // Create the System Memory HOB for the firmware
            BuildResourceDescriptorHob (
              EFI_RESOURCE_SYSTEM_MEMORY,
              ResourceAttributes,
              PcdGet64 (PcdFdBaseAddress),
              PcdGet32 (PcdFdSize)
              );

            // Top of the FD is system memory available for UEFI
            NextHob.ResourceDescriptor->PhysicalStart  += PcdGet32 (PcdFdSize);
            NextHob.ResourceDescriptor->ResourceLength -= PcdGet32 (PcdFdSize);
          }
        } else {
          // Create the System Memory HOB for the firmware
          BuildResourceDescriptorHob (
            EFI_RESOURCE_SYSTEM_MEMORY,
            ResourceAttributes,
            PcdGet64 (PcdFdBaseAddress),
            PcdGet32 (PcdFdSize)
            );

          // Update the HOB
          NextHob.ResourceDescriptor->ResourceLength = PcdGet64 (PcdFdBaseAddress) - NextHob.ResourceDescriptor->PhysicalStart;

          // If there is some memory available on the top of the FD then create a HOB
          if (FdTop < NextHob.ResourceDescriptor->PhysicalStart + ResourceLength) {
            // Create the System Memory HOB for the remaining region (top of the FD)
            BuildResourceDescriptorHob (
              EFI_RESOURCE_SYSTEM_MEMORY,
              ResourceAttributes,
              FdTop,
              ResourceTop - FdTop
              );
          }
        }

        // Mark the memory covering the Firmware Device as boot services data
        BuildMemoryAllocationHob (
          PcdGet64 (PcdFdBaseAddress),
          PcdGet32 (PcdFdSize),
          EfiBootServicesData
          );

        Found = TRUE;
        break;
      }

      NextHob.Raw = GET_NEXT_HOB (NextHob);
    }

    ASSERT (Found);
  }

  // Build Memory Allocation Hob
  InitMmu (MemoryTable);

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

  return EFI_SUCCESS;
}