system76-edk2/MdeModulePkg/Universal/MemoryTest/NullMemoryTestDxe/NullMemoryTest.c

/** @file
  Implementation of Generic Memory Test Protocol which does not perform real memory test.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "NullMemoryTest.h"

UINT64      mTestedSystemMemory = 0;
UINT64      mTotalSystemMemory  = 0;
EFI_HANDLE  mGenericMemoryTestHandle;

EFI_GENERIC_MEMORY_TEST_PROTOCOL  mGenericMemoryTest = {
  InitializeMemoryTest,
  GenPerformMemoryTest,
  GenMemoryTestFinished,
  GenCompatibleRangeTest
};

/**
  Entry point of the NULL memory test driver.

  This function is the entry point of the NULL memory test driver.
  It simply installs the Generic Memory Test Protocol.

  @param  ImageHandle    The firmware allocated handle for the EFI image.
  @param  SystemTable    A pointer to the EFI System Table.

  @retval EFI_SUCCESS    Generic Memory Test Protocol is successfully installed.

**/
EFI_STATUS
EFIAPI
GenericMemoryTestEntryPoint (
  IN  EFI_HANDLE        ImageHandle,
  IN  EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;

  Status = gBS->InstallProtocolInterface (
                  &mGenericMemoryTestHandle,
                  &gEfiGenericMemTestProtocolGuid,
                  EFI_NATIVE_INTERFACE,
                  &mGenericMemoryTest
                  );
  ASSERT_EFI_ERROR (Status);

  return EFI_SUCCESS;
}

/**
  Convert the memory range to tested.

  @param BaseAddress  Base address of the memory range.
  @param Length       Length of the memory range.
  @param Capabilities Capabilities of the memory range.

  @retval EFI_SUCCESS The memory range is converted to tested.
  @retval others      Error happens.
**/
EFI_STATUS
ConvertToTestedMemory (
  IN UINT64  BaseAddress,
  IN UINT64  Length,
  IN UINT64  Capabilities
  )
{
  EFI_STATUS  Status;

  Status = gDS->RemoveMemorySpace (
                  BaseAddress,
                  Length
                  );
  if (!EFI_ERROR (Status)) {
    Status = gDS->AddMemorySpace (
                    ((Capabilities & EFI_MEMORY_MORE_RELIABLE) == EFI_MEMORY_MORE_RELIABLE) ?
                    EfiGcdMemoryTypeMoreReliable : EfiGcdMemoryTypeSystemMemory,
                    BaseAddress,
                    Length,
                    Capabilities &~
                    (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED | EFI_MEMORY_RUNTIME)
                    );
  }

  return Status;
}

/**
  Initialize the generic memory test.

  This function implements EFI_GENERIC_MEMORY_TEST_PROTOCOL.MemoryTestInit.
  It simply promotes untested reserved memory to system memory without real test.

  @param  This                Protocol instance pointer.
  @param  Level               The coverage level of the memory test.
  @param  RequireSoftECCInit  Indicate if the memory need software ECC init.

  @retval EFI_SUCCESS         The generic memory test initialized correctly.
  @retval EFI_NO_MEDIA        There is not any non-tested memory found, in this
                              function if not any non-tesed memory found means
                              that the memory test driver have not detect any
                              non-tested extended memory of current system.

**/
EFI_STATUS
EFIAPI
InitializeMemoryTest (
  IN EFI_GENERIC_MEMORY_TEST_PROTOCOL  *This,
  IN  EXTENDMEM_COVERAGE_LEVEL         Level,
  OUT BOOLEAN                          *RequireSoftECCInit
  )
{
  EFI_STATUS                       Status;
  UINTN                            NumberOfDescriptors;
  EFI_GCD_MEMORY_SPACE_DESCRIPTOR  *MemorySpaceMap;
  UINTN                            Index;

  gDS->GetMemorySpaceMap (&NumberOfDescriptors, &MemorySpaceMap);
  for (Index = 0; Index < NumberOfDescriptors; Index++) {
    if ((MemorySpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeReserved) &&
        ((MemorySpaceMap[Index].Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==
         (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED))
        )
    {
      //
      // For those reserved memory that have not been tested, simply promote to system memory.
      //
      Status = ConvertToTestedMemory (
                 MemorySpaceMap[Index].BaseAddress,
                 MemorySpaceMap[Index].Length,
                 MemorySpaceMap[Index].Capabilities
                 );
      ASSERT_EFI_ERROR (Status);
      mTestedSystemMemory += MemorySpaceMap[Index].Length;
      mTotalSystemMemory  += MemorySpaceMap[Index].Length;
    } else if ((MemorySpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeSystemMemory) ||
               (MemorySpaceMap[Index].GcdMemoryType == EfiGcdMemoryTypeMoreReliable))
    {
      mTotalSystemMemory += MemorySpaceMap[Index].Length;
    }
  }

  FreePool (MemorySpaceMap);

  *RequireSoftECCInit = FALSE;
  return EFI_SUCCESS;
}

/**
  Perform the memory test.

  This function implements EFI_GENERIC_MEMORY_TEST_PROTOCOL.PerformMemoryTest.
  It simply returns EFI_NOT_FOUND.

  @param  This                Protocol instance pointer.
  @param  TestedMemorySize    Return the tested extended memory size.
  @param  TotalMemorySize     Return the whole system physical memory size, this
                              value may be changed if in some case some error
                              DIMMs be disabled.
  @param  ErrorOut            Any time the memory error occurs, this will be
                              TRUE.
  @param  IfTestAbort         Indicate if the user press "ESC" to skip the memory
                              test.

  @retval EFI_SUCCESS         One block of memory test ok, the block size is hide
                              internally.
  @retval EFI_NOT_FOUND       Indicate all the non-tested memory blocks have
                              already go through.
  @retval EFI_DEVICE_ERROR    Mis-compare error, and no agent can handle it

**/
EFI_STATUS
EFIAPI
GenPerformMemoryTest (
  IN EFI_GENERIC_MEMORY_TEST_PROTOCOL  *This,
  IN OUT UINT64                        *TestedMemorySize,
  OUT UINT64                           *TotalMemorySize,
  OUT BOOLEAN                          *ErrorOut,
  IN BOOLEAN                           TestAbort
  )
{
  *ErrorOut         = FALSE;
  *TestedMemorySize = mTestedSystemMemory;
  *TotalMemorySize  = mTotalSystemMemory;

  return EFI_NOT_FOUND;
}

/**
  The memory test finished.

  This function implements EFI_GENERIC_MEMORY_TEST_PROTOCOL.Finished.
  It simply returns EFI_SUCCESS.

  @param  This                Protocol instance pointer.

  @retval EFI_SUCCESS         Successful free all the generic memory test driver
                              allocated resource and notify to platform memory
                              test driver that memory test finished.

**/
EFI_STATUS
EFIAPI
GenMemoryTestFinished (
  IN EFI_GENERIC_MEMORY_TEST_PROTOCOL  *This
  )
{
  return EFI_SUCCESS;
}

/**
  Provide capability to test compatible range which used by some special
  driver required using memory range before BDS perform memory test.

  This function implements EFI_GENERIC_MEMORY_TEST_PROTOCOL.CompatibleRangeTest.
  It simply sets the memory range to system memory.

  @param  This                Protocol instance pointer.
  @param  StartAddress        The start address of the memory range.
  @param  Length              The memory range's length.

  @retval EFI_SUCCESS           The compatible memory range pass the memory test.
  @retval EFI_INVALID_PARAMETER The compatible memory range must be below 16M.

**/
EFI_STATUS
EFIAPI
GenCompatibleRangeTest (
  IN EFI_GENERIC_MEMORY_TEST_PROTOCOL  *This,
  IN EFI_PHYSICAL_ADDRESS              StartAddress,
  IN UINT64                            Length
  )
{
  EFI_STATUS                       Status;
  EFI_GCD_MEMORY_SPACE_DESCRIPTOR  Descriptor;
  EFI_PHYSICAL_ADDRESS             CurrentBase;
  UINT64                           CurrentLength;

  //
  // Check if the parameter is below 16MB
  //
  if (StartAddress + Length > SIZE_16MB) {
    return EFI_INVALID_PARAMETER;
  }

  CurrentBase = StartAddress;
  do {
    //
    // Check the required memory range status; if the required memory range span
    // the different GCD memory descriptor, it may be cause different action.
    //
    Status = gDS->GetMemorySpaceDescriptor (
                    CurrentBase,
                    &Descriptor
                    );
    if (EFI_ERROR (Status)) {
      return Status;
    }

    if ((Descriptor.GcdMemoryType == EfiGcdMemoryTypeReserved) &&
        ((Descriptor.Capabilities & (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED | EFI_MEMORY_TESTED)) ==
         (EFI_MEMORY_PRESENT | EFI_MEMORY_INITIALIZED))
        )
    {
      CurrentLength = Descriptor.BaseAddress + Descriptor.Length - CurrentBase;
      if (CurrentBase + CurrentLength > StartAddress + Length) {
        CurrentLength = StartAddress + Length - CurrentBase;
      }

      Status = ConvertToTestedMemory (
                 CurrentBase,
                 CurrentLength,
                 Descriptor.Capabilities
                 );
      if (EFI_ERROR (Status)) {
        return Status;
      }
    }

    CurrentBase = Descriptor.BaseAddress + Descriptor.Length;
  } while (CurrentBase < StartAddress + Length);

  //
  // Here means the required range already be tested, so just return success.
  //
  return EFI_SUCCESS;
}