/** @file
  Unit tests of the MtrrLib instance of the MtrrLib class

  Copyright (c) 2020 - 2023, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "MtrrLibUnitTest.h"

STATIC CONST MTRR_LIB_SYSTEM_PARAMETER  mDefaultSystemParameter = {
  42, TRUE, TRUE, CacheUncacheable, 12
};

STATIC MTRR_LIB_SYSTEM_PARAMETER  mSystemParameters[] = {
  { 38, TRUE, TRUE, CacheUncacheable,    12 },
  { 38, TRUE, TRUE, CacheWriteBack,      12 },
  { 38, TRUE, TRUE, CacheWriteThrough,   12 },
  { 38, TRUE, TRUE, CacheWriteProtected, 12 },
  { 38, TRUE, TRUE, CacheWriteCombining, 12 },

  { 42, TRUE, TRUE, CacheUncacheable,    12 },
  { 42, TRUE, TRUE, CacheWriteBack,      12 },
  { 42, TRUE, TRUE, CacheWriteThrough,   12 },
  { 42, TRUE, TRUE, CacheWriteProtected, 12 },
  { 42, TRUE, TRUE, CacheWriteCombining, 12 },

  { 48, TRUE, TRUE, CacheUncacheable,    12 },
  { 48, TRUE, TRUE, CacheWriteBack,      12 },
  { 48, TRUE, TRUE, CacheWriteThrough,   12 },
  { 48, TRUE, TRUE, CacheWriteProtected, 12 },
  { 48, TRUE, TRUE, CacheWriteCombining, 12 },

  { 48, TRUE, TRUE, CacheWriteBack,      12, 7}, // 7 bits for MKTME
};

UINT32  mFixedMtrrsIndex[] = {
  MSR_IA32_MTRR_FIX64K_00000,
  MSR_IA32_MTRR_FIX16K_80000,
  MSR_IA32_MTRR_FIX16K_A0000,
  MSR_IA32_MTRR_FIX4K_C0000,
  MSR_IA32_MTRR_FIX4K_C8000,
  MSR_IA32_MTRR_FIX4K_D0000,
  MSR_IA32_MTRR_FIX4K_D8000,
  MSR_IA32_MTRR_FIX4K_E0000,
  MSR_IA32_MTRR_FIX4K_E8000,
  MSR_IA32_MTRR_FIX4K_F0000,
  MSR_IA32_MTRR_FIX4K_F8000
};
STATIC_ASSERT (
  (ARRAY_SIZE (mFixedMtrrsIndex) == MTRR_NUMBER_OF_FIXED_MTRR),
  "gFixedMtrrIndex does NOT contain all the fixed MTRRs!"
  );

//
// Context structure to be used for most of the test cases.
//
typedef struct {
  CONST MTRR_LIB_SYSTEM_PARAMETER    *SystemParameter;
} MTRR_LIB_TEST_CONTEXT;

//
// Context structure to be used for GetFirmwareVariableMtrrCount() test.
//
typedef struct {
  UINT32                             NumberOfReservedVariableMtrrs;
  CONST MTRR_LIB_SYSTEM_PARAMETER    *SystemParameter;
} MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT;

STATIC CHAR8  *mCacheDescription[] = { "UC", "WC", "N/A", "N/A", "WT", "WP", "WB" };

/**
  Compare the actual memory ranges against expected memory ranges and return PASS when they match.

  @param ExpectedMemoryRanges     Expected memory ranges.
  @param ExpectedMemoryRangeCount Count of expected memory ranges.
  @param ActualRanges             Actual memory ranges.
  @param ActualRangeCount         Count of actual memory ranges.

  @retval UNIT_TEST_PASSED  Test passed.
  @retval others            Test failed.
**/
UNIT_TEST_STATUS
VerifyMemoryRanges (
  IN MTRR_MEMORY_RANGE  *ExpectedMemoryRanges,
  IN UINTN              ExpectedMemoryRangeCount,
  IN MTRR_MEMORY_RANGE  *ActualRanges,
  IN UINTN              ActualRangeCount
  )
{
  UINTN  Index;

  UT_ASSERT_EQUAL (ExpectedMemoryRangeCount, ActualRangeCount);
  for (Index = 0; Index < ExpectedMemoryRangeCount; Index++) {
    UT_ASSERT_EQUAL (ExpectedMemoryRanges[Index].BaseAddress, ActualRanges[Index].BaseAddress);
    UT_ASSERT_EQUAL (ExpectedMemoryRanges[Index].Length, ActualRanges[Index].Length);
    UT_ASSERT_EQUAL (ExpectedMemoryRanges[Index].Type, ActualRanges[Index].Type);
  }

  return UNIT_TEST_PASSED;
}

/**
  Dump the memory ranges.

  @param Ranges       Memory ranges to dump.
  @param RangeCount   Count of memory ranges.
**/
VOID
DumpMemoryRanges (
  MTRR_MEMORY_RANGE  *Ranges,
  UINTN              RangeCount
  )
{
  UINTN  Index;

  for (Index = 0; Index < RangeCount; Index++) {
    UT_LOG_INFO ("\t{ 0x%016llx, 0x%016llx, %a },\n", Ranges[Index].BaseAddress, Ranges[Index].Length, mCacheDescription[Ranges[Index].Type]);
  }
}

/**
**/

/**
  Generate random count of MTRRs for each cache type.

  @param TotalCount Total MTRR count.
  @param UcCount    Return count of Uncacheable type.
  @param WtCount    Return count of Write Through type.
  @param WbCount    Return count of Write Back type.
  @param WpCount    Return count of Write Protected type.
  @param WcCount    Return count of Write Combining type.
**/
VOID
GenerateRandomMemoryTypeCombination (
  IN  UINT32  TotalCount,
  OUT UINT32  *UcCount,
  OUT UINT32  *WtCount,
  OUT UINT32  *WbCount,
  OUT UINT32  *WpCount,
  OUT UINT32  *WcCount
  )
{
  UINTN   Index;
  UINT32  TotalMtrrCount;
  UINT32  *CountPerType[5];

  CountPerType[0] = UcCount;
  CountPerType[1] = WtCount;
  CountPerType[2] = WbCount;
  CountPerType[3] = WpCount;
  CountPerType[4] = WcCount;

  //
  // Initialize the count of each cache type to 0.
  //
  for (Index = 0; Index < ARRAY_SIZE (CountPerType); Index++) {
    *(CountPerType[Index]) = 0;
  }

  //
  // Pick a random count of MTRRs
  //
  TotalMtrrCount = Random32 (1, TotalCount);
  for (Index = 0; Index < TotalMtrrCount; Index++) {
    //
    // For each of them, pick a random cache type.
    //
    (*(CountPerType[Random32 (0, ARRAY_SIZE (CountPerType) - 1)]))++;
  }
}

/**
  Unit test of MtrrLib service MtrrSetMemoryAttribute()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrSetMemoryAttributesInMtrrSettings (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  CONST MTRR_LIB_SYSTEM_PARAMETER  *SystemParameter;
  RETURN_STATUS                    Status;
  UINT32                           UcCount;
  UINT32                           WtCount;
  UINT32                           WbCount;
  UINT32                           WpCount;
  UINT32                           WcCount;

  UINT32         MtrrIndex;
  UINT8          *Scratch;
  UINTN          ScratchSize;
  MTRR_SETTINGS  LocalMtrrs;

  MTRR_MEMORY_RANGE  RawMtrrRange[MTRR_NUMBER_OF_VARIABLE_MTRR];
  MTRR_MEMORY_RANGE  ExpectedMemoryRanges[MTRR_NUMBER_OF_FIXED_MTRR * sizeof (UINT64) + 2 * MTRR_NUMBER_OF_VARIABLE_MTRR + 1];
  UINT32             ExpectedVariableMtrrUsage;
  UINTN              ExpectedMemoryRangesCount;

  MTRR_MEMORY_RANGE  ActualMemoryRanges[MTRR_NUMBER_OF_FIXED_MTRR   * sizeof (UINT64) + 2 * MTRR_NUMBER_OF_VARIABLE_MTRR + 1];
  UINT32             ActualVariableMtrrUsage;
  UINTN              ActualMemoryRangesCount;

  MTRR_SETTINGS  *Mtrrs[2];

  SystemParameter = (MTRR_LIB_SYSTEM_PARAMETER *)Context;
  GenerateRandomMemoryTypeCombination (
    SystemParameter->VariableMtrrCount - PatchPcdGet32 (PcdCpuNumberOfReservedVariableMtrrs),
    &UcCount,
    &WtCount,
    &WbCount,
    &WpCount,
    &WcCount
    );
  GenerateValidAndConfigurableMtrrPairs (
    SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits,
    RawMtrrRange,
    UcCount,
    WtCount,
    WbCount,
    WpCount,
    WcCount
    );

  ExpectedVariableMtrrUsage = UcCount + WtCount + WbCount + WpCount + WcCount;
  ExpectedMemoryRangesCount = ARRAY_SIZE (ExpectedMemoryRanges);
  GetEffectiveMemoryRanges (
    SystemParameter->DefaultCacheType,
    SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits,
    RawMtrrRange,
    ExpectedVariableMtrrUsage,
    ExpectedMemoryRanges,
    &ExpectedMemoryRangesCount
    );

  UT_LOG_INFO (
    "Total MTRR [%d]: UC=%d, WT=%d, WB=%d, WP=%d, WC=%d\n",
    ExpectedVariableMtrrUsage,
    UcCount,
    WtCount,
    WbCount,
    WpCount,
    WcCount
    );
  UT_LOG_INFO ("--- Expected Memory Ranges [%d] ---\n", ExpectedMemoryRangesCount);
  DumpMemoryRanges (ExpectedMemoryRanges, ExpectedMemoryRangesCount);

  //
  // Default cache type is always an INPUT
  //
  ZeroMem (&LocalMtrrs, sizeof (LocalMtrrs));
  LocalMtrrs.MtrrDefType = MtrrGetDefaultMemoryType ();
  ScratchSize            = SCRATCH_BUFFER_SIZE;
  Mtrrs[0]               = &LocalMtrrs;
  Mtrrs[1]               = NULL;

  for (MtrrIndex = 0; MtrrIndex < ARRAY_SIZE (Mtrrs); MtrrIndex++) {
    Scratch = calloc (ScratchSize, sizeof (UINT8));
    Status  = MtrrSetMemoryAttributesInMtrrSettings (Mtrrs[MtrrIndex], Scratch, &ScratchSize, ExpectedMemoryRanges, ExpectedMemoryRangesCount);
    if (Status == RETURN_BUFFER_TOO_SMALL) {
      Scratch = realloc (Scratch, ScratchSize);
      Status  = MtrrSetMemoryAttributesInMtrrSettings (Mtrrs[MtrrIndex], Scratch, &ScratchSize, ExpectedMemoryRanges, ExpectedMemoryRangesCount);
    }

    UT_ASSERT_STATUS_EQUAL (Status, RETURN_SUCCESS);

    if (Mtrrs[MtrrIndex] == NULL) {
      ZeroMem (&LocalMtrrs, sizeof (LocalMtrrs));
      MtrrGetAllMtrrs (&LocalMtrrs);
    }

    ActualMemoryRangesCount = ARRAY_SIZE (ActualMemoryRanges);
    CollectTestResult (
      SystemParameter->DefaultCacheType,
      SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits,
      SystemParameter->VariableMtrrCount,
      &LocalMtrrs,
      ActualMemoryRanges,
      &ActualMemoryRangesCount,
      &ActualVariableMtrrUsage
      );

    UT_LOG_INFO ("--- Actual Memory Ranges [%d] ---\n", ActualMemoryRangesCount);
    DumpMemoryRanges (ActualMemoryRanges, ActualMemoryRangesCount);
    VerifyMemoryRanges (ExpectedMemoryRanges, ExpectedMemoryRangesCount, ActualMemoryRanges, ActualMemoryRangesCount);
    UT_ASSERT_TRUE (ExpectedVariableMtrrUsage >= ActualVariableMtrrUsage);

    ZeroMem (&LocalMtrrs, sizeof (LocalMtrrs));
  }

  free (Scratch);

  return UNIT_TEST_PASSED;
}

/**
  Test routine to check whether invalid base/size can be rejected.

  @param Context   Pointer to MTRR_LIB_SYSTEM_PARAMETER.

  @return Test status.
**/
UNIT_TEST_STATUS
EFIAPI
UnitTestInvalidMemoryLayouts (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  CONST MTRR_LIB_SYSTEM_PARAMETER  *SystemParameter;
  MTRR_MEMORY_RANGE                Ranges[MTRR_NUMBER_OF_VARIABLE_MTRR * 2 + 1];
  UINTN                            RangeCount;
  UINT64                           MaxAddress;
  UINT32                           Index;
  UINT64                           BaseAddress;
  UINT64                           Length;
  RETURN_STATUS                    Status;
  UINTN                            ScratchSize;

  SystemParameter = (MTRR_LIB_SYSTEM_PARAMETER *)Context;

  RangeCount = Random32 (1, ARRAY_SIZE (Ranges));
  MaxAddress = 1ull << (SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits);

  for (Index = 0; Index < RangeCount; Index++) {
    do {
      BaseAddress = Random64 (0, MaxAddress);
      Length      = Random64 (1, MaxAddress - BaseAddress);
    } while (((BaseAddress & 0xFFF) == 0) || ((Length & 0xFFF) == 0));

    Ranges[Index].BaseAddress = BaseAddress;
    Ranges[Index].Length      = Length;
    Ranges[Index].Type        = GenerateRandomCacheType ();

    Status = MtrrSetMemoryAttribute (
               Ranges[Index].BaseAddress,
               Ranges[Index].Length,
               Ranges[Index].Type
               );
    UT_ASSERT_TRUE (RETURN_ERROR (Status));
  }

  ScratchSize = 0;
  Status      = MtrrSetMemoryAttributesInMtrrSettings (NULL, NULL, &ScratchSize, Ranges, RangeCount);
  UT_ASSERT_TRUE (RETURN_ERROR (Status));

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service IsMtrrSupported()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestIsMtrrSupported (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_LIB_SYSTEM_PARAMETER  SystemParameter;
  MTRR_LIB_TEST_CONTEXT      *LocalContext;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));
  //
  // MTRR capability off in CPUID leaf.
  //
  SystemParameter.MtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  UT_ASSERT_FALSE (IsMtrrSupported ());

  //
  // MTRR capability on in CPUID leaf, but no variable or fixed MTRRs.
  //
  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.VariableMtrrCount  = 0;
  SystemParameter.FixedMtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  UT_ASSERT_FALSE (IsMtrrSupported ());

  //
  // MTRR capability on in CPUID leaf, but no variable MTRRs.
  //
  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.VariableMtrrCount  = 0;
  SystemParameter.FixedMtrrSupported = TRUE;
  InitializeMtrrRegs (&SystemParameter);
  UT_ASSERT_FALSE (IsMtrrSupported ());

  //
  // MTRR capability on in CPUID leaf, but no fixed MTRRs.
  //
  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.VariableMtrrCount  = 7;
  SystemParameter.FixedMtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  UT_ASSERT_FALSE (IsMtrrSupported ());

  //
  // MTRR capability on in CPUID leaf with both variable and fixed MTRRs.
  //
  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.VariableMtrrCount  = 7;
  SystemParameter.FixedMtrrSupported = TRUE;
  InitializeMtrrRegs (&SystemParameter);
  UT_ASSERT_TRUE (IsMtrrSupported ());

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service GetVariableMtrrCount()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestGetVariableMtrrCount (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  UINT32                     Result;
  MTRR_LIB_SYSTEM_PARAMETER  SystemParameter;
  MTRR_LIB_TEST_CONTEXT      *LocalContext;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));
  //
  // If MTRR capability off in CPUID leaf, then the count is always 0.
  //
  SystemParameter.MtrrSupported = FALSE;
  for (SystemParameter.VariableMtrrCount = 1; SystemParameter.VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR; SystemParameter.VariableMtrrCount++) {
    InitializeMtrrRegs (&SystemParameter);
    Result = GetVariableMtrrCount ();
    UT_ASSERT_EQUAL (Result, 0);
  }

  //
  // Try all supported variable MTRR counts.
  // If variable MTRR count is > MTRR_NUMBER_OF_VARIABLE_MTRR, then an ASSERT()
  // is generated.
  //
  SystemParameter.MtrrSupported = TRUE;
  for (SystemParameter.VariableMtrrCount = 1; SystemParameter.VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR; SystemParameter.VariableMtrrCount++) {
    InitializeMtrrRegs (&SystemParameter);
    Result = GetVariableMtrrCount ();
    UT_ASSERT_EQUAL (Result, SystemParameter.VariableMtrrCount);
  }

  //
  // Expect ASSERT() if variable MTRR count is > MTRR_NUMBER_OF_VARIABLE_MTRR
  //
  SystemParameter.VariableMtrrCount = MTRR_NUMBER_OF_VARIABLE_MTRR + 1;
  InitializeMtrrRegs (&SystemParameter);
  UT_EXPECT_ASSERT_FAILURE (GetVariableMtrrCount (), NULL);

  SystemParameter.MtrrSupported     = TRUE;
  SystemParameter.VariableMtrrCount = MAX_UINT8;
  InitializeMtrrRegs (&SystemParameter);
  UT_EXPECT_ASSERT_FAILURE (GetVariableMtrrCount (), NULL);

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service GetFirmwareVariableMtrrCount()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestGetFirmwareVariableMtrrCount (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  UINT32                                             Result;
  UINT32                                             ReservedMtrrs;
  MTRR_LIB_SYSTEM_PARAMETER                          SystemParameter;
  MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT  *LocalContext;

  LocalContext = (MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));

  InitializeMtrrRegs (&SystemParameter);
  //
  // Positive test cases for VCNT = 10 and Reserved PCD in range 0..10
  //
  for (ReservedMtrrs = 0; ReservedMtrrs <= SystemParameter.VariableMtrrCount; ReservedMtrrs++) {
    PatchPcdSet32 (PcdCpuNumberOfReservedVariableMtrrs, ReservedMtrrs);
    Result = GetFirmwareVariableMtrrCount ();
    UT_ASSERT_EQUAL (Result, SystemParameter.VariableMtrrCount - ReservedMtrrs);
  }

  //
  // Negative test cases when Reserved PCD is larger than VCNT
  //
  for (ReservedMtrrs = SystemParameter.VariableMtrrCount + 1; ReservedMtrrs <= 255; ReservedMtrrs++) {
    PatchPcdSet32 (PcdCpuNumberOfReservedVariableMtrrs, ReservedMtrrs);
    Result = GetFirmwareVariableMtrrCount ();
    UT_ASSERT_EQUAL (Result, 0);
  }

  //
  // Negative test cases when Reserved PCD is larger than VCNT
  //
  PatchPcdSet32 (PcdCpuNumberOfReservedVariableMtrrs, MAX_UINT32);
  Result = GetFirmwareVariableMtrrCount ();
  UT_ASSERT_EQUAL (Result, 0);

  //
  // Negative test case when MTRRs are not supported
  //
  SystemParameter.MtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  PatchPcdSet32 (PcdCpuNumberOfReservedVariableMtrrs, 2);
  Result = GetFirmwareVariableMtrrCount ();
  UT_ASSERT_EQUAL (Result, 0);

  //
  // Negative test case when Fixed MTRRs are not supported
  //
  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.FixedMtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  PatchPcdSet32 (PcdCpuNumberOfReservedVariableMtrrs, 2);
  Result = GetFirmwareVariableMtrrCount ();
  UT_ASSERT_EQUAL (Result, 0);

  //
  // Expect ASSERT() if variable MTRR count is > MTRR_NUMBER_OF_VARIABLE_MTRR
  //
  SystemParameter.FixedMtrrSupported = TRUE;
  SystemParameter.VariableMtrrCount  = MTRR_NUMBER_OF_VARIABLE_MTRR + 1;
  InitializeMtrrRegs (&SystemParameter);
  UT_EXPECT_ASSERT_FAILURE (GetFirmwareVariableMtrrCount (), NULL);

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrGetMemoryAttribute()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrGetMemoryAttribute (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrGetFixedMtrr()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrGetFixedMtrr (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_FIXED_SETTINGS        *Result;
  MTRR_FIXED_SETTINGS        ExpectedFixedSettings;
  MTRR_FIXED_SETTINGS        FixedSettings;
  UINTN                      Index;
  UINTN                      MsrIndex;
  UINTN                      ByteIndex;
  UINT64                     MsrValue;
  MTRR_LIB_SYSTEM_PARAMETER  SystemParameter;
  MTRR_LIB_TEST_CONTEXT      *LocalContext;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));
  InitializeMtrrRegs (&SystemParameter);
  //
  // Set random cache type to different ranges under 1MB and make sure
  // the fixed MTRR settings are expected.
  // Try 100 times.
  //
  for (Index = 0; Index < 100; Index++) {
    for (MsrIndex = 0; MsrIndex < ARRAY_SIZE (mFixedMtrrsIndex); MsrIndex++) {
      MsrValue = 0;
      for (ByteIndex = 0; ByteIndex < sizeof (UINT64); ByteIndex++) {
        MsrValue = MsrValue | LShiftU64 (GenerateRandomCacheType (), ByteIndex * 8);
      }

      ExpectedFixedSettings.Mtrr[MsrIndex] = MsrValue;
      AsmWriteMsr64 (mFixedMtrrsIndex[MsrIndex], MsrValue);
    }

    Result = MtrrGetFixedMtrr (&FixedSettings);
    UT_ASSERT_EQUAL ((UINTN)Result, (UINTN)&FixedSettings);
    UT_ASSERT_MEM_EQUAL (&FixedSettings, &ExpectedFixedSettings, sizeof (FixedSettings));
  }

  //
  // Negative test case when MTRRs are not supported
  //
  SystemParameter.MtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);

  ZeroMem (&FixedSettings, sizeof (FixedSettings));
  ZeroMem (&ExpectedFixedSettings, sizeof (ExpectedFixedSettings));
  Result = MtrrGetFixedMtrr (&FixedSettings);
  UT_ASSERT_EQUAL ((UINTN)Result, (UINTN)&FixedSettings);
  UT_ASSERT_MEM_EQUAL (&ExpectedFixedSettings, &FixedSettings, sizeof (ExpectedFixedSettings));

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrGetAllMtrrs()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrGetAllMtrrs (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_SETTINGS              *Result;
  MTRR_SETTINGS              Mtrrs;
  MTRR_SETTINGS              ExpectedMtrrs;
  MTRR_VARIABLE_SETTING      VariableMtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];
  UINT32                     Index;
  MTRR_LIB_SYSTEM_PARAMETER  SystemParameter;
  MTRR_LIB_TEST_CONTEXT      *LocalContext;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));
  InitializeMtrrRegs (&SystemParameter);

  for (Index = 0; Index < SystemParameter.VariableMtrrCount; Index++) {
    GenerateRandomMtrrPair (SystemParameter.PhysicalAddressBits, GenerateRandomCacheType (), &VariableMtrr[Index], NULL);
    AsmWriteMsr64 (MSR_IA32_MTRR_PHYSBASE0 + (Index << 1), VariableMtrr[Index].Base);
    AsmWriteMsr64 (MSR_IA32_MTRR_PHYSMASK0 + (Index << 1), VariableMtrr[Index].Mask);
  }

  Result = MtrrGetAllMtrrs (&Mtrrs);
  UT_ASSERT_EQUAL ((UINTN)Result, (UINTN)&Mtrrs);
  UT_ASSERT_MEM_EQUAL (Mtrrs.Variables.Mtrr, VariableMtrr, sizeof (MTRR_VARIABLE_SETTING) * SystemParameter.VariableMtrrCount);

  //
  // Negative test case when MTRRs are not supported
  //
  ZeroMem (&ExpectedMtrrs, sizeof (ExpectedMtrrs));
  ZeroMem (&Mtrrs, sizeof (Mtrrs));

  SystemParameter.MtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  Result = MtrrGetAllMtrrs (&Mtrrs);
  UT_ASSERT_EQUAL ((UINTN)Result, (UINTN)&Mtrrs);
  UT_ASSERT_MEM_EQUAL (&ExpectedMtrrs, &Mtrrs, sizeof (ExpectedMtrrs));

  //
  // Expect ASSERT() if variable MTRR count is > MTRR_NUMBER_OF_VARIABLE_MTRR
  //
  SystemParameter.MtrrSupported     = TRUE;
  SystemParameter.VariableMtrrCount = MTRR_NUMBER_OF_VARIABLE_MTRR + 1;
  InitializeMtrrRegs (&SystemParameter);
  UT_EXPECT_ASSERT_FAILURE (MtrrGetAllMtrrs (&Mtrrs), NULL);

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrSetAllMtrrs()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrSetAllMtrrs (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_SETTINGS                    *Result;
  MTRR_SETTINGS                    Mtrrs;
  UINT32                           Index;
  MSR_IA32_MTRR_DEF_TYPE_REGISTER  Default;
  MTRR_LIB_SYSTEM_PARAMETER        SystemParameter;
  MTRR_LIB_TEST_CONTEXT            *LocalContext;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));
  InitializeMtrrRegs (&SystemParameter);

  Default.Uint64    = 0;
  Default.Bits.E    = 1;
  Default.Bits.FE   = 1;
  Default.Bits.Type = GenerateRandomCacheType ();

  ZeroMem (&Mtrrs, sizeof (Mtrrs));
  Mtrrs.MtrrDefType = Default.Uint64;
  for (Index = 0; Index < SystemParameter.VariableMtrrCount; Index++) {
    GenerateRandomMtrrPair (SystemParameter.PhysicalAddressBits, GenerateRandomCacheType (), &Mtrrs.Variables.Mtrr[Index], NULL);
  }

  Result = MtrrSetAllMtrrs (&Mtrrs);
  UT_ASSERT_EQUAL ((UINTN)Result, (UINTN)&Mtrrs);

  UT_ASSERT_EQUAL (AsmReadMsr64 (MSR_IA32_MTRR_DEF_TYPE), Mtrrs.MtrrDefType);
  for (Index = 0; Index < SystemParameter.VariableMtrrCount; Index++) {
    UT_ASSERT_EQUAL (AsmReadMsr64 (MSR_IA32_MTRR_PHYSBASE0 + (Index << 1)), Mtrrs.Variables.Mtrr[Index].Base);
    UT_ASSERT_EQUAL (AsmReadMsr64 (MSR_IA32_MTRR_PHYSMASK0 + (Index << 1)), Mtrrs.Variables.Mtrr[Index].Mask);
  }

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrGetMemoryAttributeInVariableMtrr()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrGetMemoryAttributeInVariableMtrr (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_LIB_TEST_CONTEXT            *LocalContext;
  MTRR_LIB_SYSTEM_PARAMETER        SystemParameter;
  UINT32                           Result;
  MTRR_VARIABLE_SETTING            VariableSetting[MTRR_NUMBER_OF_VARIABLE_MTRR];
  VARIABLE_MTRR                    VariableMtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];
  UINT64                           ValidMtrrBitsMask;
  UINT64                           ValidMtrrAddressMask;
  UINT32                           Index;
  MSR_IA32_MTRR_PHYSBASE_REGISTER  Base;
  MSR_IA32_MTRR_PHYSMASK_REGISTER  Mask;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));

  InitializeMtrrRegs (&SystemParameter);

  ValidMtrrBitsMask    = (1ull << SystemParameter.PhysicalAddressBits) - 1;
  ValidMtrrAddressMask = ValidMtrrBitsMask & 0xfffffffffffff000ULL;

  for (Index = 0; Index < SystemParameter.VariableMtrrCount; Index++) {
    GenerateRandomMtrrPair (SystemParameter.PhysicalAddressBits, GenerateRandomCacheType (), &VariableSetting[Index], NULL);
    AsmWriteMsr64 (MSR_IA32_MTRR_PHYSBASE0 + (Index << 1), VariableSetting[Index].Base);
    AsmWriteMsr64 (MSR_IA32_MTRR_PHYSMASK0 + (Index << 1), VariableSetting[Index].Mask);
  }

  Result = MtrrGetMemoryAttributeInVariableMtrr (ValidMtrrBitsMask, ValidMtrrAddressMask, VariableMtrr);
  UT_ASSERT_EQUAL (Result, SystemParameter.VariableMtrrCount);

  for (Index = 0; Index < SystemParameter.VariableMtrrCount; Index++) {
    Base.Uint64    = VariableMtrr[Index].BaseAddress;
    Base.Bits.Type = (UINT32)VariableMtrr[Index].Type;
    UT_ASSERT_EQUAL (Base.Uint64, VariableSetting[Index].Base);

    Mask.Uint64 = ~(VariableMtrr[Index].Length - 1) & ValidMtrrBitsMask;
    Mask.Bits.V = 1;
    UT_ASSERT_EQUAL (Mask.Uint64, VariableSetting[Index].Mask);
  }

  //
  // Negative test case when MTRRs are not supported
  //
  SystemParameter.MtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  Result = MtrrGetMemoryAttributeInVariableMtrr (ValidMtrrBitsMask, ValidMtrrAddressMask, VariableMtrr);
  UT_ASSERT_EQUAL (Result, 0);

  //
  // Expect ASSERT() if variable MTRR count is > MTRR_NUMBER_OF_VARIABLE_MTRR
  //
  SystemParameter.MtrrSupported     = TRUE;
  SystemParameter.VariableMtrrCount = MTRR_NUMBER_OF_VARIABLE_MTRR + 1;
  InitializeMtrrRegs (&SystemParameter);
  UT_EXPECT_ASSERT_FAILURE (MtrrGetMemoryAttributeInVariableMtrr (ValidMtrrBitsMask, ValidMtrrAddressMask, VariableMtrr), NULL);

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrDebugPrintAllMtrrs()

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrDebugPrintAllMtrrs (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrGetDefaultMemoryType().

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrGetDefaultMemoryType (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_LIB_TEST_CONTEXT      *LocalContext;
  UINTN                      Index;
  MTRR_MEMORY_CACHE_TYPE     Result;
  MTRR_LIB_SYSTEM_PARAMETER  SystemParameter;
  MTRR_MEMORY_CACHE_TYPE     CacheType[5];

  CacheType[0] = CacheUncacheable;
  CacheType[1] = CacheWriteCombining;
  CacheType[2] = CacheWriteThrough;
  CacheType[3] = CacheWriteProtected;
  CacheType[4] = CacheWriteBack;

  LocalContext = (MTRR_LIB_TEST_CONTEXT *)Context;

  CopyMem (&SystemParameter, LocalContext->SystemParameter, sizeof (SystemParameter));
  //
  // If MTRRs are supported, then always return the cache type in the MSR
  // MSR_IA32_MTRR_DEF_TYPE
  //
  for (Index = 0; Index < ARRAY_SIZE (CacheType); Index++) {
    SystemParameter.DefaultCacheType = CacheType[Index];
    InitializeMtrrRegs (&SystemParameter);
    Result = MtrrGetDefaultMemoryType ();
    UT_ASSERT_EQUAL (Result, SystemParameter.DefaultCacheType);
  }

  //
  // If MTRRs are not supported, then always return CacheUncacheable
  //
  SystemParameter.MtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  Result = MtrrGetDefaultMemoryType ();
  UT_ASSERT_EQUAL (Result, CacheUncacheable);

  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.FixedMtrrSupported = FALSE;
  InitializeMtrrRegs (&SystemParameter);
  Result = MtrrGetDefaultMemoryType ();
  UT_ASSERT_EQUAL (Result, CacheUncacheable);

  SystemParameter.MtrrSupported      = TRUE;
  SystemParameter.FixedMtrrSupported = TRUE;
  SystemParameter.VariableMtrrCount  = 0;
  InitializeMtrrRegs (&SystemParameter);
  Result = MtrrGetDefaultMemoryType ();
  UT_ASSERT_EQUAL (Result, CacheUncacheable);

  return UNIT_TEST_PASSED;
}

/**
  Unit test of MtrrLib service MtrrSetMemoryAttributeInMtrrSettings().

  @param[in]  Context    Ignored

  @retval  UNIT_TEST_PASSED             The Unit test has completed and the test
                                        case was successful.
  @retval  UNIT_TEST_ERROR_TEST_FAILED  A test case assertion has failed.

**/
UNIT_TEST_STATUS
EFIAPI
UnitTestMtrrSetMemoryAttributeInMtrrSettings (
  IN UNIT_TEST_CONTEXT  Context
  )
{
  CONST MTRR_LIB_SYSTEM_PARAMETER  *SystemParameter;
  RETURN_STATUS                    Status;
  UINT32                           UcCount;
  UINT32                           WtCount;
  UINT32                           WbCount;
  UINT32                           WpCount;
  UINT32                           WcCount;

  UINTN          MtrrIndex;
  UINTN          Index;
  MTRR_SETTINGS  LocalMtrrs;

  MTRR_MEMORY_RANGE  RawMtrrRange[MTRR_NUMBER_OF_VARIABLE_MTRR];
  MTRR_MEMORY_RANGE  ExpectedMemoryRanges[MTRR_NUMBER_OF_FIXED_MTRR * sizeof (UINT64) + 2 * MTRR_NUMBER_OF_VARIABLE_MTRR + 1];
  UINT32             ExpectedVariableMtrrUsage;
  UINTN              ExpectedMemoryRangesCount;

  MTRR_MEMORY_RANGE  ActualMemoryRanges[MTRR_NUMBER_OF_FIXED_MTRR * sizeof (UINT64) + 2 * MTRR_NUMBER_OF_VARIABLE_MTRR + 1];
  UINT32             ActualVariableMtrrUsage;
  UINTN              ActualMemoryRangesCount;

  MTRR_SETTINGS  *Mtrrs[2];

  SystemParameter = (MTRR_LIB_SYSTEM_PARAMETER *)Context;
  GenerateRandomMemoryTypeCombination (
    SystemParameter->VariableMtrrCount - PatchPcdGet32 (PcdCpuNumberOfReservedVariableMtrrs),
    &UcCount,
    &WtCount,
    &WbCount,
    &WpCount,
    &WcCount
    );
  GenerateValidAndConfigurableMtrrPairs (
    SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits,
    RawMtrrRange,
    UcCount,
    WtCount,
    WbCount,
    WpCount,
    WcCount
    );

  ExpectedVariableMtrrUsage = UcCount + WtCount + WbCount + WpCount + WcCount;
  ExpectedMemoryRangesCount = ARRAY_SIZE (ExpectedMemoryRanges);
  GetEffectiveMemoryRanges (
    SystemParameter->DefaultCacheType,
    SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits,
    RawMtrrRange,
    ExpectedVariableMtrrUsage,
    ExpectedMemoryRanges,
    &ExpectedMemoryRangesCount
    );

  UT_LOG_INFO ("--- Expected Memory Ranges [%d] ---\n", ExpectedMemoryRangesCount);
  DumpMemoryRanges (ExpectedMemoryRanges, ExpectedMemoryRangesCount);
  //
  // Default cache type is always an INPUT
  //
  ZeroMem (&LocalMtrrs, sizeof (LocalMtrrs));
  LocalMtrrs.MtrrDefType = MtrrGetDefaultMemoryType ();
  Mtrrs[0]               = &LocalMtrrs;
  Mtrrs[1]               = NULL;

  for (MtrrIndex = 0; MtrrIndex < ARRAY_SIZE (Mtrrs); MtrrIndex++) {
    for (Index = 0; Index < ExpectedMemoryRangesCount; Index++) {
      Status = MtrrSetMemoryAttributeInMtrrSettings (
                 Mtrrs[MtrrIndex],
                 ExpectedMemoryRanges[Index].BaseAddress,
                 ExpectedMemoryRanges[Index].Length,
                 ExpectedMemoryRanges[Index].Type
                 );
      UT_ASSERT_TRUE (Status == RETURN_SUCCESS || Status == RETURN_OUT_OF_RESOURCES || Status == RETURN_BUFFER_TOO_SMALL);
      if ((Status == RETURN_OUT_OF_RESOURCES) || (Status == RETURN_BUFFER_TOO_SMALL)) {
        return UNIT_TEST_SKIPPED;
      }
    }

    if (Mtrrs[MtrrIndex] == NULL) {
      ZeroMem (&LocalMtrrs, sizeof (LocalMtrrs));
      MtrrGetAllMtrrs (&LocalMtrrs);
    }

    ActualMemoryRangesCount = ARRAY_SIZE (ActualMemoryRanges);
    CollectTestResult (
      SystemParameter->DefaultCacheType,
      SystemParameter->PhysicalAddressBits - SystemParameter->MkTmeKeyidBits,
      SystemParameter->VariableMtrrCount,
      &LocalMtrrs,
      ActualMemoryRanges,
      &ActualMemoryRangesCount,
      &ActualVariableMtrrUsage
      );
    UT_LOG_INFO ("--- Actual Memory Ranges [%d] ---\n", ActualMemoryRangesCount);
    DumpMemoryRanges (ActualMemoryRanges, ActualMemoryRangesCount);
    VerifyMemoryRanges (ExpectedMemoryRanges, ExpectedMemoryRangesCount, ActualMemoryRanges, ActualMemoryRangesCount);
    UT_ASSERT_TRUE (ExpectedVariableMtrrUsage >= ActualVariableMtrrUsage);

    ZeroMem (&LocalMtrrs, sizeof (LocalMtrrs));
  }

  return UNIT_TEST_PASSED;
}

/**
  Prep routine for UnitTestGetFirmwareVariableMtrrCount().

  @param Context  Point to a UINT32 data to save the PcdCpuNumberOfReservedVariableMtrrs.
**/
UNIT_TEST_STATUS
EFIAPI
SavePcdValue (
  UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT  *LocalContext;

  LocalContext                                = (MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT *)Context;
  LocalContext->NumberOfReservedVariableMtrrs = PatchPcdGet32 (PcdCpuNumberOfReservedVariableMtrrs);
  return UNIT_TEST_PASSED;
}

/**
  Clean up routine for UnitTestGetFirmwareVariableMtrrCount().

  @param Context  Point to a UINT32 data to save the PcdCpuNumberOfReservedVariableMtrrs.
**/
VOID
EFIAPI
RestorePcdValue (
  UNIT_TEST_CONTEXT  Context
  )
{
  MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT  *LocalContext;

  LocalContext = (MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT *)Context;
  PatchPcdSet32 (PcdCpuNumberOfReservedVariableMtrrs, LocalContext->NumberOfReservedVariableMtrrs);
}

/**
  Initialize the unit test framework, suite, and unit tests for the
  ResetSystemLib and run the ResetSystemLib unit test.

  @param Iteration               Iteration of testing MtrrSetMemoryAttributeInMtrrSettings
                                 and MtrrSetMemoryAttributesInMtrrSettings using random inputs.

  @retval  EFI_SUCCESS           All test cases were dispatched.
  @retval  EFI_OUT_OF_RESOURCES  There are not enough resources available to
                                 initialize the unit tests.
**/
STATIC
EFI_STATUS
EFIAPI
UnitTestingEntry (
  UINTN  Iteration
  )
{
  EFI_STATUS                                         Status;
  UNIT_TEST_FRAMEWORK_HANDLE                         Framework;
  UNIT_TEST_SUITE_HANDLE                             MtrrApiTests;
  UINTN                                              Index;
  UINTN                                              SystemIndex;
  MTRR_LIB_TEST_CONTEXT                              Context;
  MTRR_LIB_GET_FIRMWARE_VARIABLE_MTRR_COUNT_CONTEXT  GetFirmwareVariableMtrrCountContext;

  Context.SystemParameter                             = &mDefaultSystemParameter;
  GetFirmwareVariableMtrrCountContext.SystemParameter = &mDefaultSystemParameter;
  Framework                                           = NULL;

  //
  // Setup the test framework for running the tests.
  //
  Status = InitUnitTestFramework (&Framework, UNIT_TEST_APP_NAME, gEfiCallerBaseName, UNIT_TEST_APP_VERSION);
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Failed in InitUnitTestFramework. Status = %r\n", Status));
    goto EXIT;
  }

  //
  // --------------Suite-----------Description--------------Name----------Function--------Pre---Post-------------------Context-----------
  //

  //
  // Populate the MtrrLib API Unit Test Suite.
  //
  Status = CreateUnitTestSuite (&MtrrApiTests, Framework, "MtrrLib API Tests", "MtrrLib.MtrrLib", NULL, NULL);
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "Failed in CreateUnitTestSuite for MtrrLib API Tests\n"));
    Status = EFI_OUT_OF_RESOURCES;
    goto EXIT;
  }

  AddTestCase (MtrrApiTests, "Test IsMtrrSupported", "MtrrSupported", UnitTestIsMtrrSupported, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test GetVariableMtrrCount", "GetVariableMtrrCount", UnitTestGetVariableMtrrCount, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test GetFirmwareVariableMtrrCount", "GetFirmwareVariableMtrrCount", UnitTestGetFirmwareVariableMtrrCount, SavePcdValue, RestorePcdValue, &GetFirmwareVariableMtrrCountContext);
  AddTestCase (MtrrApiTests, "Test MtrrGetMemoryAttribute", "MtrrGetMemoryAttribute", UnitTestMtrrGetMemoryAttribute, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test MtrrGetFixedMtrr", "MtrrGetFixedMtrr", UnitTestMtrrGetFixedMtrr, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test MtrrGetAllMtrrs", "MtrrGetAllMtrrs", UnitTestMtrrGetAllMtrrs, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test MtrrSetAllMtrrs", "MtrrSetAllMtrrs", UnitTestMtrrSetAllMtrrs, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test MtrrGetMemoryAttributeInVariableMtrr", "MtrrGetMemoryAttributeInVariableMtrr", UnitTestMtrrGetMemoryAttributeInVariableMtrr, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test MtrrDebugPrintAllMtrrs", "MtrrDebugPrintAllMtrrs", UnitTestMtrrDebugPrintAllMtrrs, NULL, NULL, &Context);
  AddTestCase (MtrrApiTests, "Test MtrrGetDefaultMemoryType", "MtrrGetDefaultMemoryType", UnitTestMtrrGetDefaultMemoryType, NULL, NULL, &Context);

  for (SystemIndex = 0; SystemIndex < ARRAY_SIZE (mSystemParameters); SystemIndex++) {
    for (Index = 0; Index < Iteration; Index++) {
      AddTestCase (MtrrApiTests, "Test InvalidMemoryLayouts", "InvalidMemoryLayouts", UnitTestInvalidMemoryLayouts, InitializeSystem, NULL, &mSystemParameters[SystemIndex]);
      AddTestCase (MtrrApiTests, "Test MtrrSetMemoryAttributeInMtrrSettings", "MtrrSetMemoryAttributeInMtrrSettings", UnitTestMtrrSetMemoryAttributeInMtrrSettings, InitializeSystem, NULL, &mSystemParameters[SystemIndex]);
      AddTestCase (MtrrApiTests, "Test MtrrSetMemoryAttributesInMtrrSettings", "MtrrSetMemoryAttributesInMtrrSettings", UnitTestMtrrSetMemoryAttributesInMtrrSettings, InitializeSystem, NULL, &mSystemParameters[SystemIndex]);
    }
  }

  //
  // Execute the tests.
  //
  Status = RunAllTestSuites (Framework);

EXIT:
  if (Framework != NULL) {
    FreeUnitTestFramework (Framework);
  }

  return Status;
}

/**
  Standard POSIX C entry point for host based unit test execution.

  @param Argc  Number of arguments.
  @param Argv  Array of arguments.

  @return Test application exit code.
**/
INT32
main (
  INT32  Argc,
  CHAR8  *Argv[]
  )
{
  UINTN  Count;

  DEBUG ((DEBUG_INFO, "%a v%a\n", UNIT_TEST_APP_NAME, UNIT_TEST_APP_VERSION));
  srand ((unsigned int)time (NULL));

  //
  // MtrrLibUnitTest generate-random-numbers <path to MtrrLib/UnitTest/RandomNumber.c> <random-number count>
  //
  if ((Argc == 4) && (AsciiStriCmp ("generate-random-numbers", Argv[1]) == 0)) {
    Count = atoi (Argv[3]);
    DEBUG ((DEBUG_INFO, "Generate %d random numbers to %a.\n", Count, Argv[2]));
    GenerateRandomNumbers (Argv[2], Count);
    return 0;
  }

  //
  // MtrrLibUnitTest [<iterations>]
  //                 <iterations> [fixed|random]
  //   Default <iterations> is 10.
  //   Default uses fixed inputs.
  //
  Count        = 10;
  mRandomInput = FALSE;
  if ((Argc == 2) || (Argc == 3)) {
    Count = atoi (Argv[1]);
    if (Argc == 3) {
      if (AsciiStriCmp ("fixed", Argv[2]) == 0) {
        mRandomInput = FALSE;
      } else if (AsciiStriCmp ("random", Argv[2]) == 0) {
        mRandomInput = TRUE;
      }
    }
  }

  DEBUG ((DEBUG_INFO, "Iterations = %d\n", Count));
  DEBUG ((DEBUG_INFO, "Input      = %a\n", mRandomInput ? "random" : "fixed"));

  return UnitTestingEntry (Count);
}
