UefiCpuPkg/MtrrLib/UnitTest: Add host based unit test

Add host based unit tests for the MtrrLib services. The BaseLib services AsmCpuid(), AsmReadMsr64(), and AsmWriteMsr64() are hooked and provide simple emulation of the CPUID leafs and MSRs required by the MtrrLib to run as a host based unit test. Test cases are developed for each of the API. For the most important APIs MtrrSetMemoryAttributesInMtrrSettings() and MtrrSetMemoryAttributeInMtrrSettings(), random inputs are generated and fed to the APIs to make sure the implementation is good. The test application accepts an optional parameter which specifies how many iterations of feeding random inputs to the two APIs. The overall number of test cases increases when the iteration increases. Default iteration is 10 when no parameter is specified. Signed-off-by: Ray Ni <ray.ni@intel.com> Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Ming Shao <ming.shao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ming Shao <ming.shao@intel.com> Cc: Sean Brogan <sean.brogan@microsoft.com> Cc: Bret Barkelew <Bret.Barkelew@microsoft.com> Cc: Jiewen Yao <jiewen.yao@intel.com>
author: Ray Ni <ray.ni@intel.com> 2020-05-20 05:13:11 +0800
committer: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> 2020-08-12 11:38:37 +0000
commit: e17f459af2594b6ccbb8d56064737b8a23414b76 (patch)
tree: 9899a0603e5a071ec4ffafa49ba5c3c89cfd8816
parent: be01087e07809d20aa2db27b37029c324c824407 (diff)
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6 files changed, 2325 insertions, 1 deletions
diff --git a/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.c b/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.c
new file mode 100644
index 0000000000..123e1c741a
--- /dev/null
+++ b/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.c
@@ -0,0 +1,1139 @@
+/** @file
+  Unit tests of the MtrrLib instance of the MtrrLib class
+
+  Copyright (c) 2020, 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 },
+};
+
+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, RawMtrrRange,
+    UcCount, WtCount, WbCount, WpCount, WcCount
+    );
+
+  ExpectedVariableMtrrUsage = UcCount + WtCount + WbCount + WpCount + WcCount;
+  ExpectedMemoryRangesCount = ARRAY_SIZE (ExpectedMemoryRanges);
+  GetEffectiveMemoryRanges (
+    SystemParameter->DefaultCacheType,
+    SystemParameter->PhysicalAddressBits,
+    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->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;
+
+  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 (Result, &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 (Result, &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 (Result, &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 (Result, &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 (Result, &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, RawMtrrRange,
+    UcCount, WtCount, WbCount, WpCount, WcCount
+    );
+
+  ExpectedVariableMtrrUsage = UcCount + WtCount + WbCount + WpCount + WcCount;
+  ExpectedMemoryRangesCount = ARRAY_SIZE (ExpectedMemoryRanges);
+  GetEffectiveMemoryRanges (
+    SystemParameter->DefaultCacheType,
+    SystemParameter->PhysicalAddressBits,
+    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->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;
+
+  DEBUG ((DEBUG_INFO, "%a v%a\n", UNIT_TEST_APP_NAME, UNIT_TEST_APP_VERSION));
+
+  //
+  // 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.
+  //
+  srand ((unsigned int) time (NULL));
+  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    Iteration;
+
+  //
+  // First parameter specifies the test iterations.
+  // Default is 10.
+  //
+  Iteration = 10;
+  if (Argc == 2) {
+    Iteration = atoi (Argv[1]);
+  }
+  return UnitTestingEntry (Iteration);
+}
diff --git a/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.h b/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.h
new file mode 100644
index 0000000000..9750523133
--- /dev/null
+++ b/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.h
@@ -0,0 +1,182 @@
+/** @file
+
+  Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _MTRR_SUPPORT_H_
+#define _MTRR_SUPPORT_H_
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <cmocka.h>
+#include <time.h>
+
+#include <Uefi.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UnitTestLib.h>
+#include <Library/MtrrLib.h>
+#include <Library/UnitTestHostBaseLib.h>
+
+#include <Register/ArchitecturalMsr.h>
+#include <Register/Cpuid.h>
+#include <Register/Msr.h>
+
+#define UNIT_TEST_APP_NAME        "MtrrLib Unit Tests"
+#define UNIT_TEST_APP_VERSION     "1.0"
+
+#define SCRATCH_BUFFER_SIZE       SIZE_16KB
+
+typedef struct {
+  UINT8                  PhysicalAddressBits;
+  BOOLEAN                MtrrSupported;
+  BOOLEAN                FixedMtrrSupported;
+  MTRR_MEMORY_CACHE_TYPE DefaultCacheType;
+  UINT32                 VariableMtrrCount;
+} MTRR_LIB_SYSTEM_PARAMETER;
+
+extern UINT32                           mFixedMtrrsIndex[];
+
+/**
+  Initialize the MTRR registers.
+
+  @param SystemParameter System parameter that controls the MTRR registers initialization.
+**/
+UNIT_TEST_STATUS
+EFIAPI
+InitializeMtrrRegs (
+  IN MTRR_LIB_SYSTEM_PARAMETER  *SystemParameter
+  );
+
+/**
+  Initialize the MTRR registers.
+
+  @param Context System parameter that controls the MTRR registers initialization.
+**/
+UNIT_TEST_STATUS
+EFIAPI
+InitializeSystem (
+  IN UNIT_TEST_CONTEXT        Context
+  );
+
+/**
+  Return a random memory cache type.
+**/
+MTRR_MEMORY_CACHE_TYPE
+GenerateRandomCacheType (
+  VOID
+  );
+
+/**
+  Generate random MTRRs.
+
+  @param PhysicalAddressBits  Physical address bits.
+  @param RawMemoryRanges      Return the randomly generated MTRRs.
+  @param UcCount              Count of Uncacheable MTRRs.
+  @param WtCount              Count of Write Through MTRRs.
+  @param WbCount              Count of Write Back MTRRs.
+  @param WpCount              Count of Write Protected MTRRs.
+  @param WcCount              Count of Write Combining MTRRs.
+**/
+VOID
+GenerateValidAndConfigurableMtrrPairs (
+  IN     UINT32                    PhysicalAddressBits,
+  IN OUT MTRR_MEMORY_RANGE         *RawMemoryRanges,
+  IN     UINT32                    UcCount,
+  IN     UINT32                    WtCount,
+  IN     UINT32                    WbCount,
+  IN     UINT32                    WpCount,
+  IN     UINT32                    WcCount
+  );
+
+/**
+  Convert the MTRR BASE/MASK array to memory ranges.
+
+  @param DefaultType          Default memory type.
+  @param PhysicalAddressBits  Physical address bits.
+  @param RawMemoryRanges      Raw memory ranges.
+  @param RawMemoryRangeCount  Count of raw memory ranges.
+  @param MemoryRanges         Memory ranges.
+  @param MemoryRangeCount     Count of memory ranges.
+**/
+VOID
+GetEffectiveMemoryRanges (
+  IN MTRR_MEMORY_CACHE_TYPE DefaultType,
+  IN UINT32                 PhysicalAddressBits,
+  IN MTRR_MEMORY_RANGE      *RawMemoryRanges,
+  IN UINT32                 RawMemoryRangeCount,
+  OUT MTRR_MEMORY_RANGE     *MemoryRanges,
+  OUT UINTN                 *MemoryRangeCount
+  );
+
+/**
+  Generate random MTRR BASE/MASK for a specified type.
+
+  @param PhysicalAddressBits Physical address bits.
+  @param CacheType           Cache type.
+  @param MtrrPair            Return the random MTRR.
+  @param MtrrMemoryRange     Return the random memory range.
+**/
+VOID
+GenerateRandomMtrrPair (
+  IN  UINT32                 PhysicalAddressBits,
+  IN  MTRR_MEMORY_CACHE_TYPE CacheType,
+  OUT MTRR_VARIABLE_SETTING  *MtrrPair,       OPTIONAL
+  OUT MTRR_MEMORY_RANGE      *MtrrMemoryRange OPTIONAL
+  );
+
+/**
+  Collect the test result.
+
+  @param DefaultType          Default memory type.
+  @param PhysicalAddressBits  Physical address bits.
+  @param VariableMtrrCount    Count of variable MTRRs.
+  @param Mtrrs                MTRR settings to collect from.
+  @param Ranges               Return the memory ranges.
+  @param RangeCount           Return the count of memory ranges.
+  @param MtrrCount            Return the count of variable MTRRs being used.
+**/
+VOID
+CollectTestResult (
+  IN     MTRR_MEMORY_CACHE_TYPE DefaultType,
+  IN     UINT32                 PhysicalAddressBits,
+  IN     UINT32                 VariableMtrrCount,
+  IN     MTRR_SETTINGS          *Mtrrs,
+  OUT    MTRR_MEMORY_RANGE      *Ranges,
+  IN OUT UINTN                  *RangeCount,
+  OUT    UINT32                 *MtrrCount
+  );
+
+/**
+  Return a 64bit random number.
+
+  @param Start  Start of the random number range.
+  @param Limit  Limit of the random number range.
+  @return 64bit random number
+**/
+UINT64
+Random64 (
+  UINT64  Start,
+  UINT64  Limit
+  );
+
+/**
+  Return a 32bit random number.
+
+  @param Start  Start of the random number range.
+  @param Limit  Limit of the random number range.
+  @return 32bit random number
+**/
+UINT32
+Random32 (
+  UINT32  Start,
+  UINT32  Limit
+  );
+#endif
diff --git a/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTestHost.inf b/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTestHost.inf
new file mode 100644
index 0000000000..447238dc81
--- /dev/null
+++ b/UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTestHost.inf
@@ -0,0 +1,39 @@
+## @file
+# Unit tests of the MtrrLib instance of the MtrrLib class
+#
+# Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010006
+  BASE_NAME                      = MtrrLibUnitTestHost
+  FILE_GUID                      = A1542D84-B64D-4847-885E-0509084376AB
+  MODULE_TYPE                    = HOST_APPLICATION
+  VERSION_STRING                 = 1.0
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  MtrrLibUnitTest.c
+  MtrrLibUnitTest.h
+  Support.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+  UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  MtrrLib
+  UnitTestLib
+
+[Pcd]
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuNumberOfReservedVariableMtrrs   ## SOMETIMES_CONSUMES
diff --git a/UefiCpuPkg/Library/MtrrLib/UnitTest/Support.c b/UefiCpuPkg/Library/MtrrLib/UnitTest/Support.c
new file mode 100644
index 0000000000..a7eed45940
--- /dev/null
+++ b/UefiCpuPkg/Library/MtrrLib/UnitTest/Support.c
@@ -0,0 +1,923 @@
+/** @file
+  Unit tests of the MtrrLib instance of the MtrrLib class
+
+  Copyright (c) 2018 - 2020, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "MtrrLibUnitTest.h"
+
+MTRR_MEMORY_CACHE_TYPE mMemoryCacheTypes[] = {
+  CacheUncacheable, CacheWriteCombining, CacheWriteThrough, CacheWriteProtected, CacheWriteBack
+  };
+
+UINT64                           mFixedMtrrsValue[MTRR_NUMBER_OF_FIXED_MTRR];
+MSR_IA32_MTRR_PHYSBASE_REGISTER  mVariableMtrrsPhysBase[MTRR_NUMBER_OF_VARIABLE_MTRR];
+MSR_IA32_MTRR_PHYSMASK_REGISTER  mVariableMtrrsPhysMask[MTRR_NUMBER_OF_VARIABLE_MTRR];
+MSR_IA32_MTRR_DEF_TYPE_REGISTER  mDefTypeMsr;
+MSR_IA32_MTRRCAP_REGISTER        mMtrrCapMsr;
+CPUID_VERSION_INFO_EDX           mCpuidVersionInfoEdx;
+CPUID_VIR_PHY_ADDRESS_SIZE_EAX   mCpuidVirPhyAddressSizeEax;
+
+/**
+  Retrieves CPUID information.
+
+  Executes the CPUID instruction with EAX set to the value specified by Index.
+  This function always returns Index.
+  If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.
+  If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.
+  If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.
+  If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.
+  This function is only available on IA-32 and x64.
+
+  @param  Index The 32-bit value to load into EAX prior to invoking the CPUID
+                instruction.
+  @param  Eax   The pointer to the 32-bit EAX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+  @param  Ebx   The pointer to the 32-bit EBX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+  @param  Ecx   The pointer to the 32-bit ECX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+  @param  Edx   The pointer to the 32-bit EDX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+
+  @return Index.
+
+**/
+UINT32
+EFIAPI
+UnitTestMtrrLibAsmCpuid (
+  IN      UINT32                    Index,
+  OUT     UINT32                    *Eax,  OPTIONAL
+  OUT     UINT32                    *Ebx,  OPTIONAL
+  OUT     UINT32                    *Ecx,  OPTIONAL
+  OUT     UINT32                    *Edx   OPTIONAL
+  )
+{
+  switch (Index) {
+  case CPUID_VERSION_INFO:
+    if (Edx != NULL) {
+      *Edx = mCpuidVersionInfoEdx.Uint32;
+    }
+    return Index;
+    break;
+  case CPUID_EXTENDED_FUNCTION:
+    if (Eax != NULL) {
+      *Eax = CPUID_VIR_PHY_ADDRESS_SIZE;
+    }
+    return Index;
+    break;
+  case CPUID_VIR_PHY_ADDRESS_SIZE:
+    if (Eax != NULL) {
+      *Eax = mCpuidVirPhyAddressSizeEax.Uint32;
+    }
+    return Index;
+    break;
+  }
+
+  //
+  // Should never fall through to here
+  //
+  ASSERT(FALSE);
+  return Index;
+}
+
+/**
+  Returns a 64-bit Machine Specific Register(MSR).
+
+  Reads and returns the 64-bit MSR specified by Index. No parameter checking is
+  performed on Index, and some Index values may cause CPU exceptions. The
+  caller must either guarantee that Index is valid, or the caller must set up
+  exception handlers to catch the exceptions. This function is only available
+  on IA-32 and x64.
+
+  @param  MsrIndex The 32-bit MSR index to read.
+
+  @return The value of the MSR identified by MsrIndex.
+
+**/
+UINT64
+EFIAPI
+UnitTestMtrrLibAsmReadMsr64(
+  IN UINT32  MsrIndex
+  )
+{
+  UINT32 Index;
+
+  for (Index = 0; Index < ARRAY_SIZE (mFixedMtrrsValue); Index++) {
+    if (MsrIndex == mFixedMtrrsIndex[Index]) {
+      return mFixedMtrrsValue[Index];
+    }
+  }
+
+  if ((MsrIndex >= MSR_IA32_MTRR_PHYSBASE0) &&
+      (MsrIndex <= MSR_IA32_MTRR_PHYSMASK0 + (MTRR_NUMBER_OF_VARIABLE_MTRR << 1))) {
+    if (MsrIndex % 2 == 0) {
+      Index = (MsrIndex - MSR_IA32_MTRR_PHYSBASE0) >> 1;
+      return mVariableMtrrsPhysBase[Index].Uint64;
+    } else {
+      Index = (MsrIndex - MSR_IA32_MTRR_PHYSMASK0) >> 1;
+      return mVariableMtrrsPhysMask[Index].Uint64;
+    }
+  }
+
+  if (MsrIndex == MSR_IA32_MTRR_DEF_TYPE) {
+    return mDefTypeMsr.Uint64;
+  }
+
+  if (MsrIndex == MSR_IA32_MTRRCAP) {
+    return mMtrrCapMsr.Uint64;
+  }
+
+  //
+  // Should never fall through to here
+  //
+  ASSERT(FALSE);
+  return 0;
+}
+
+/**
+  Writes a 64-bit value to a Machine Specific Register(MSR), and returns the
+  value.
+
+  Writes the 64-bit value specified by Value to the MSR specified by Index. The
+  64-bit value written to the MSR is returned. No parameter checking is
+  performed on Index or Value, and some of these may cause CPU exceptions. The
+  caller must either guarantee that Index and Value are valid, or the caller
+  must establish proper exception handlers. This function is only available on
+  IA-32 and x64.
+
+  @param  MsrIndex The 32-bit MSR index to write.
+  @param  Value The 64-bit value to write to the MSR.
+
+  @return Value
+
+**/
+UINT64
+EFIAPI
+UnitTestMtrrLibAsmWriteMsr64(
+  IN      UINT32                    MsrIndex,
+  IN      UINT64                    Value
+  )
+{
+  UINT32 Index;
+
+  for (Index = 0; Index < ARRAY_SIZE (mFixedMtrrsValue); Index++) {
+    if (MsrIndex == mFixedMtrrsIndex[Index]) {
+      mFixedMtrrsValue[Index] = Value;
+      return Value;
+    }
+  }
+
+  if ((MsrIndex >= MSR_IA32_MTRR_PHYSBASE0) &&
+      (MsrIndex <= MSR_IA32_MTRR_PHYSMASK0 + (MTRR_NUMBER_OF_VARIABLE_MTRR << 1))) {
+    if (MsrIndex % 2 == 0) {
+      Index = (MsrIndex - MSR_IA32_MTRR_PHYSBASE0) >> 1;
+      mVariableMtrrsPhysBase[Index].Uint64 = Value;
+      return Value;
+    } else {
+      Index = (MsrIndex - MSR_IA32_MTRR_PHYSMASK0) >> 1;
+      mVariableMtrrsPhysMask[Index].Uint64 = Value;
+      return Value;
+    }
+  }
+
+  if (MsrIndex == MSR_IA32_MTRR_DEF_TYPE) {
+    mDefTypeMsr.Uint64 = Value;
+    return Value;
+  }
+
+  if (MsrIndex == MSR_IA32_MTRRCAP) {
+    mMtrrCapMsr.Uint64 = Value;
+    return Value;
+  }
+
+  //
+  // Should never fall through to here
+  //
+  ASSERT(FALSE);
+  return 0;
+}
+
+/**
+  Initialize the MTRR registers.
+
+  @param SystemParameter System parameter that controls the MTRR registers initialization.
+**/
+UNIT_TEST_STATUS
+EFIAPI
+InitializeMtrrRegs (
+  IN MTRR_LIB_SYSTEM_PARAMETER  *SystemParameter
+  )
+{
+  UINT32                    Index;
+
+  SetMem (mFixedMtrrsValue, sizeof (mFixedMtrrsValue), SystemParameter->DefaultCacheType);
+
+  for (Index = 0; Index < ARRAY_SIZE (mVariableMtrrsPhysBase); Index++) {
+    mVariableMtrrsPhysBase[Index].Uint64         = 0;
+    mVariableMtrrsPhysBase[Index].Bits.Type      = SystemParameter->DefaultCacheType;
+    mVariableMtrrsPhysBase[Index].Bits.Reserved1 = 0;
+
+    mVariableMtrrsPhysMask[Index].Uint64         = 0;
+    mVariableMtrrsPhysMask[Index].Bits.V         = 0;
+    mVariableMtrrsPhysMask[Index].Bits.Reserved1 = 0;
+  }
+
+  mDefTypeMsr.Bits.E         = 1;
+  mDefTypeMsr.Bits.FE        = 1;
+  mDefTypeMsr.Bits.Type      = SystemParameter->DefaultCacheType;
+  mDefTypeMsr.Bits.Reserved1 = 0;
+  mDefTypeMsr.Bits.Reserved2 = 0;
+  mDefTypeMsr.Bits.Reserved3 = 0;
+
+  mMtrrCapMsr.Bits.SMRR      = 0;
+  mMtrrCapMsr.Bits.WC        = 0;
+  mMtrrCapMsr.Bits.VCNT      = SystemParameter->VariableMtrrCount;
+  mMtrrCapMsr.Bits.FIX       = SystemParameter->FixedMtrrSupported;
+  mMtrrCapMsr.Bits.Reserved1 = 0;
+  mMtrrCapMsr.Bits.Reserved2 = 0;
+  mMtrrCapMsr.Bits.Reserved3 = 0;
+
+  mCpuidVersionInfoEdx.Bits.MTRR                      = SystemParameter->MtrrSupported;
+  mCpuidVirPhyAddressSizeEax.Bits.PhysicalAddressBits = SystemParameter->PhysicalAddressBits;
+
+  //
+  // Hook BaseLib functions used by MtrrLib that require some emulation.
+  //
+  gUnitTestHostBaseLib.X86->AsmCpuid      = UnitTestMtrrLibAsmCpuid;
+  gUnitTestHostBaseLib.X86->AsmReadMsr64  = UnitTestMtrrLibAsmReadMsr64;
+  gUnitTestHostBaseLib.X86->AsmWriteMsr64 = UnitTestMtrrLibAsmWriteMsr64;
+
+  return UNIT_TEST_PASSED;
+}
+
+/**
+  Initialize the MTRR registers.
+
+  @param Context System parameter that controls the MTRR registers initialization.
+**/
+UNIT_TEST_STATUS
+EFIAPI
+InitializeSystem (
+  IN UNIT_TEST_CONTEXT        Context
+  )
+{
+  return InitializeMtrrRegs ((MTRR_LIB_SYSTEM_PARAMETER *) Context);
+}
+
+/**
+  Collect the test result.
+
+  @param DefaultType          Default memory type.
+  @param PhysicalAddressBits  Physical address bits.
+  @param VariableMtrrCount    Count of variable MTRRs.
+  @param Mtrrs                MTRR settings to collect from.
+  @param Ranges               Return the memory ranges.
+  @param RangeCount           Return the count of memory ranges.
+  @param MtrrCount            Return the count of variable MTRRs being used.
+**/
+VOID
+CollectTestResult (
+  IN     MTRR_MEMORY_CACHE_TYPE DefaultType,
+  IN     UINT32                 PhysicalAddressBits,
+  IN     UINT32                 VariableMtrrCount,
+  IN     MTRR_SETTINGS          *Mtrrs,
+  OUT    MTRR_MEMORY_RANGE      *Ranges,
+  IN OUT UINTN                  *RangeCount,
+  OUT    UINT32                 *MtrrCount
+  )
+{
+  UINTN             Index;
+  UINT64            MtrrValidBitsMask;
+  UINT64            MtrrValidAddressMask;
+  MTRR_MEMORY_RANGE RawMemoryRanges[ARRAY_SIZE (Mtrrs->Variables.Mtrr)];
+
+  ASSERT (Mtrrs != NULL);
+  ASSERT (VariableMtrrCount <= ARRAY_SIZE (Mtrrs->Variables.Mtrr));
+
+  MtrrValidBitsMask = (1ull << PhysicalAddressBits) - 1;
+  MtrrValidAddressMask = MtrrValidBitsMask & ~0xFFFull;
+
+  *MtrrCount = 0;
+  for (Index = 0; Index < VariableMtrrCount; Index++) {
+    if (((MSR_IA32_MTRR_PHYSMASK_REGISTER *) &Mtrrs->Variables.Mtrr[Index].Mask)->Bits.V == 1) {
+      RawMemoryRanges[*MtrrCount].BaseAddress = Mtrrs->Variables.Mtrr[Index].Base & MtrrValidAddressMask;
+      RawMemoryRanges[*MtrrCount].Type        =
+        ((MSR_IA32_MTRR_PHYSBASE_REGISTER *) &Mtrrs->Variables.Mtrr[Index].Base)->Bits.Type;
+      RawMemoryRanges[*MtrrCount].Length      =
+          ((~(Mtrrs->Variables.Mtrr[Index].Mask & MtrrValidAddressMask)) & MtrrValidBitsMask) + 1;
+      (*MtrrCount)++;
+    }
+  }
+
+  GetEffectiveMemoryRanges (DefaultType, PhysicalAddressBits, RawMemoryRanges, *MtrrCount, Ranges, RangeCount);
+}
+
+/**
+  Return a 32bit random number.
+
+  @param Start  Start of the random number range.
+  @param Limit  Limit of the random number range.
+  @return 32bit random number
+**/
+UINT32
+Random32 (
+  UINT32  Start,
+  UINT32  Limit
+  )
+{
+  return (UINT32) (((double) rand () / RAND_MAX) * (Limit - Start)) + Start;
+}
+
+/**
+  Return a 64bit random number.
+
+  @param Start  Start of the random number range.
+  @param Limit  Limit of the random number range.
+  @return 64bit random number
+**/
+UINT64
+Random64 (
+  UINT64  Start,
+  UINT64  Limit
+  )
+{
+  return (UINT64) (((double) rand () / RAND_MAX) * (Limit - Start)) + Start;
+}
+
+/**
+  Generate random MTRR BASE/MASK for a specified type.
+
+  @param PhysicalAddressBits Physical address bits.
+  @param CacheType           Cache type.
+  @param MtrrPair            Return the random MTRR.
+  @param MtrrMemoryRange     Return the random memory range.
+**/
+VOID
+GenerateRandomMtrrPair (
+  IN  UINT32                 PhysicalAddressBits,
+  IN  MTRR_MEMORY_CACHE_TYPE CacheType,
+  OUT MTRR_VARIABLE_SETTING  *MtrrPair,       OPTIONAL
+  OUT MTRR_MEMORY_RANGE      *MtrrMemoryRange OPTIONAL
+  )
+{
+  MSR_IA32_MTRR_PHYSBASE_REGISTER PhysBase;
+  MSR_IA32_MTRR_PHYSMASK_REGISTER PhysMask;
+  UINT32                          SizeShift;
+  UINT32                          BaseShift;
+  UINT64                          RandomBoundary;
+  UINT64                          MaxPhysicalAddress;
+  UINT64                          RangeSize;
+  UINT64                          RangeBase;
+  UINT64                          PhysBasePhyMaskValidBitsMask;
+
+  MaxPhysicalAddress = 1ull << PhysicalAddressBits;
+  do {
+    SizeShift = Random32 (12, PhysicalAddressBits - 1);
+    RangeSize = 1ull << SizeShift;
+
+    BaseShift = Random32 (SizeShift, PhysicalAddressBits - 1);
+    RandomBoundary = Random64 (0, 1ull << (PhysicalAddressBits - BaseShift));
+    RangeBase = RandomBoundary << BaseShift;
+  } while (RangeBase < SIZE_1MB || RangeBase > MaxPhysicalAddress - 1);
+
+  PhysBasePhyMaskValidBitsMask = (MaxPhysicalAddress - 1) & 0xfffffffffffff000ULL;
+
+  PhysBase.Uint64    = 0;
+  PhysBase.Bits.Type = CacheType;
+  PhysBase.Uint64   |= RangeBase & PhysBasePhyMaskValidBitsMask;
+  PhysMask.Uint64    = 0;
+  PhysMask.Bits.V    = 1;
+  PhysMask.Uint64   |= ((~RangeSize) + 1) & PhysBasePhyMaskValidBitsMask;
+
+  if (MtrrPair != NULL) {
+    MtrrPair->Base = PhysBase.Uint64;
+    MtrrPair->Mask = PhysMask.Uint64;
+  }
+
+  if (MtrrMemoryRange != NULL) {
+    MtrrMemoryRange->BaseAddress = RangeBase;
+    MtrrMemoryRange->Length      = RangeSize;
+    MtrrMemoryRange->Type        = CacheType;
+  }
+}
+
+
+/**
+  Check whether the Range overlaps with any one in Ranges.
+
+  @param Range  The memory range to check.
+  @param Ranges The memory ranges.
+  @param Count  Count of memory ranges.
+
+  @return TRUE when overlap exists.
+**/
+BOOLEAN
+RangesOverlap (
+  IN MTRR_MEMORY_RANGE *Range,
+  IN MTRR_MEMORY_RANGE *Ranges,
+  IN UINTN             Count
+  )
+{
+  while (Count-- != 0) {
+    //
+    // Two ranges overlap when:
+    // 1. range#2.base is in the middle of range#1
+    // 2. range#1.base is in the middle of range#2
+    //
+    if ((Range->BaseAddress <= Ranges[Count].BaseAddress && Ranges[Count].BaseAddress < Range->BaseAddress + Range->Length)
+     || (Ranges[Count].BaseAddress <= Range->BaseAddress && Range->BaseAddress < Ranges[Count].BaseAddress + Ranges[Count].Length)) {
+      return TRUE;
+    }
+  }
+  return FALSE;
+}
+
+/**
+  Generate random MTRRs.
+
+  @param PhysicalAddressBits  Physical address bits.
+  @param RawMemoryRanges      Return the randomly generated MTRRs.
+  @param UcCount              Count of Uncacheable MTRRs.
+  @param WtCount              Count of Write Through MTRRs.
+  @param WbCount              Count of Write Back MTRRs.
+  @param WpCount              Count of Write Protected MTRRs.
+  @param WcCount              Count of Write Combine MTRRs.
+**/
+VOID
+GenerateValidAndConfigurableMtrrPairs (
+  IN     UINT32                    PhysicalAddressBits,
+  IN OUT MTRR_MEMORY_RANGE         *RawMemoryRanges,
+  IN     UINT32                    UcCount,
+  IN     UINT32                    WtCount,
+  IN     UINT32                    WbCount,
+  IN     UINT32                    WpCount,
+  IN     UINT32                    WcCount
+  )
+{
+  UINT32                          Index;
+
+  //
+  // 1. Generate UC, WT, WB in order.
+  //
+  for (Index = 0; Index < UcCount; Index++) {
+    GenerateRandomMtrrPair (PhysicalAddressBits, CacheUncacheable, NULL, &RawMemoryRanges[Index]);
+  }
+
+  for (Index = UcCount; Index < UcCount + WtCount; Index++) {
+    GenerateRandomMtrrPair (PhysicalAddressBits, CacheWriteThrough, NULL, &RawMemoryRanges[Index]);
+  }
+
+  for (Index = UcCount + WtCount; Index < UcCount + WtCount + WbCount; Index++) {
+    GenerateRandomMtrrPair (PhysicalAddressBits, CacheWriteBack, NULL, &RawMemoryRanges[Index]);
+  }
+
+  //
+  // 2. Generate WP MTRR and DO NOT overlap with WT, WB.
+  //
+  for (Index = UcCount + WtCount + WbCount; Index < UcCount + WtCount + WbCount + WpCount; Index++) {
+    GenerateRandomMtrrPair (PhysicalAddressBits, CacheWriteProtected, NULL, &RawMemoryRanges[Index]);
+    while (RangesOverlap (&RawMemoryRanges[Index], &RawMemoryRanges[UcCount], WtCount + WbCount)) {
+      GenerateRandomMtrrPair (PhysicalAddressBits, CacheWriteProtected, NULL, &RawMemoryRanges[Index]);
+    }
+  }
+
+  //
+  // 3. Generate WC MTRR and DO NOT overlap with WT, WB, WP.
+  //
+  for (Index = UcCount + WtCount + WbCount + WpCount; Index < UcCount + WtCount + WbCount + WpCount + WcCount; Index++) {
+    GenerateRandomMtrrPair (PhysicalAddressBits, CacheWriteCombining, NULL, &RawMemoryRanges[Index]);
+    while (RangesOverlap (&RawMemoryRanges[Index], &RawMemoryRanges[UcCount], WtCount + WbCount + WpCount)) {
+      GenerateRandomMtrrPair (PhysicalAddressBits, CacheWriteCombining, NULL, &RawMemoryRanges[Index]);
+    }
+  }
+}
+
+/**
+  Return a random memory cache type.
+**/
+MTRR_MEMORY_CACHE_TYPE
+GenerateRandomCacheType (
+  VOID
+  )
+{
+    return mMemoryCacheTypes[Random32 (0, ARRAY_SIZE (mMemoryCacheTypes) - 1)];
+}
+
+/**
+  Compare function used by qsort().
+**/
+
+/**
+  Compare function used by qsort().
+
+  @param Left   Left operand to compare.
+  @param Right  Right operand to compare.
+
+  @retval 0  Left == Right
+  @retval -1 Left < Right
+  @retval 1  Left > Right
+**/
+INT32
+CompareFuncUint64 (
+  CONST VOID * Left,
+  CONST VOID * Right
+  )
+{
+    INT64 Delta;
+    Delta = (*(UINT64*)Left - *(UINT64*)Right);
+    if (Delta > 0) {
+      return 1;
+    } else if (Delta == 0) {
+      return 0;
+    } else {
+      return -1;
+    }
+}
+
+/**
+  Determin the memory cache type for the Range.
+
+  @param DefaultType Default cache type.
+  @param Range       The memory range to determin the cache type.
+  @param Ranges      The entire memory ranges.
+  @param RangeCount  Count of the entire memory ranges.
+**/
+VOID
+DetermineMemoryCacheType (
+  IN     MTRR_MEMORY_CACHE_TYPE DefaultType,
+  IN OUT MTRR_MEMORY_RANGE      *Range,
+  IN     MTRR_MEMORY_RANGE      *Ranges,
+  IN     UINT32                 RangeCount
+  )
+{
+  UINT32 Index;
+  Range->Type = CacheInvalid;
+  for (Index = 0; Index < RangeCount; Index++) {
+    if (RangesOverlap (Range, &Ranges[Index], 1)) {
+      if (Ranges[Index].Type < Range->Type) {
+        Range->Type = Ranges[Index].Type;
+      }
+    }
+  }
+
+  if (Range->Type == CacheInvalid) {
+    Range->Type = DefaultType;
+  }
+}
+
+/**
+  Get the index of the element that does NOT equals to Array[Index].
+
+  @param Index   Current element.
+  @param Array   Array to scan.
+  @param Count   Count of the array.
+
+  @return Next element that doesn't equal to current one.
+**/
+UINT32
+GetNextDifferentElementInSortedArray (
+  IN UINT32 Index,
+  IN UINT64 *Array,
+  IN UINT32 Count
+  )
+{
+  UINT64 CurrentElement;
+  CurrentElement = Array[Index];
+  while (CurrentElement == Array[Index] && Index < Count) {
+    Index++;
+  }
+  return Index;
+}
+
+/**
+  Remove the duplicates from the array.
+
+  @param Array  The array to operate on.
+  @param Count  Count of the array.
+**/
+VOID
+RemoveDuplicatesInSortedArray (
+  IN OUT UINT64 *Array,
+  IN OUT UINT32 *Count
+  )
+{
+  UINT32 Index;
+  UINT32 NewCount;
+
+  Index    = 0;
+  NewCount = 0;
+  while (Index < *Count) {
+    Array[NewCount] = Array[Index];
+    NewCount++;
+    Index = GetNextDifferentElementInSortedArray (Index, Array, *Count);
+  }
+  *Count = NewCount;
+}
+
+/**
+  Return TRUE when Address is in the Range.
+
+  @param Address The address to check.
+  @param Range   The range to check.
+  @return TRUE when Address is in the Range.
+**/
+BOOLEAN
+AddressInRange (
+  IN UINT64            Address,
+  IN MTRR_MEMORY_RANGE Range
+  )
+{
+    return (Address >= Range.BaseAddress) && (Address <= Range.BaseAddress + Range.Length - 1);
+}
+
+/**
+  Get the overlap bit flag.
+
+  @param RawMemoryRanges     Raw memory ranges.
+  @param RawMemoryRangeCount Count of raw memory ranges.
+  @param Address             The address to check.
+**/
+UINT64
+GetOverlapBitFlag (
+  IN MTRR_MEMORY_RANGE *RawMemoryRanges,
+  IN UINT32            RawMemoryRangeCount,
+  IN UINT64            Address
+  )
+{
+  UINT64 OverlapBitFlag;
+  UINT32 Index;
+  OverlapBitFlag = 0;
+  for (Index = 0; Index < RawMemoryRangeCount; Index++) {
+    if (AddressInRange (Address, RawMemoryRanges[Index])) {
+      OverlapBitFlag |= (1ull << Index);
+    }
+  }
+
+  return OverlapBitFlag;
+}
+
+/**
+  Return the relationship between flags.
+
+  @param Flag1 Flag 1
+  @param Flag2 Flag 2
+
+  @retval 0   Flag1 == Flag2
+  @retval 1   Flag1 is a subset of Flag2
+  @retval 2   Flag2 is a subset of Flag1
+  @retval 3   No subset relations between Flag1 and Flag2.
+**/
+UINT32
+CheckOverlapBitFlagsRelation (
+  IN UINT64 Flag1,
+  IN UINT64 Flag2
+  )
+{
+    if (Flag1 == Flag2) return 0;
+    if ((Flag1 | Flag2) == Flag2) return 1;
+    if ((Flag1 | Flag2) == Flag1) return 2;
+    return 3;
+}
+
+/**
+  Return TRUE when the Endpoint is in any of the Ranges.
+
+  @param Endpoint    The endpoint to check.
+  @param Ranges      The memory ranges.
+  @param RangeCount  Count of memory ranges.
+
+  @retval TRUE  Endpoint is in one of the range.
+  @retval FALSE Endpoint is not in any of the ranges.
+**/
+BOOLEAN
+IsEndpointInRanges (
+  IN UINT64            Endpoint,
+  IN MTRR_MEMORY_RANGE *Ranges,
+  IN UINTN             RangeCount
+  )
+{
+    UINT32 Index;
+    for (Index = 0; Index < RangeCount; Index++) {
+      if (AddressInRange (Endpoint, Ranges[Index])) {
+        return TRUE;
+      }
+    }
+    return FALSE;
+}
+
+
+/**
+  Compact adjacent ranges of the same type.
+
+  @param DefaultType                    Default memory type.
+  @param PhysicalAddressBits            Physical address bits.
+  @param EffectiveMtrrMemoryRanges      Memory ranges to compact.
+  @param EffectiveMtrrMemoryRangesCount Return the new count of memory ranges.
+**/
+VOID
+CompactAndExtendEffectiveMtrrMemoryRanges (
+  IN     MTRR_MEMORY_CACHE_TYPE DefaultType,
+  IN     UINT32                 PhysicalAddressBits,
+  IN OUT MTRR_MEMORY_RANGE      **EffectiveMtrrMemoryRanges,
+  IN OUT UINTN                  *EffectiveMtrrMemoryRangesCount
+  )
+{
+  UINT64                        MaxAddress;
+  UINTN                         NewRangesCountAtMost;
+  MTRR_MEMORY_RANGE             *NewRanges;
+  UINTN                         NewRangesCountActual;
+  MTRR_MEMORY_RANGE             *CurrentRangeInNewRanges;
+  MTRR_MEMORY_CACHE_TYPE        CurrentRangeTypeInOldRanges;
+
+  MTRR_MEMORY_RANGE             *OldRanges;
+  MTRR_MEMORY_RANGE             OldLastRange;
+  UINTN                         OldRangesIndex;
+
+  NewRangesCountActual = 0;
+  NewRangesCountAtMost = *EffectiveMtrrMemoryRangesCount + 2;   // At most with 2 more range entries.
+  NewRanges            = (MTRR_MEMORY_RANGE *) calloc (NewRangesCountAtMost, sizeof (MTRR_MEMORY_RANGE));
+  OldRanges            = *EffectiveMtrrMemoryRanges;
+  if (OldRanges[0].BaseAddress > 0) {
+    NewRanges[NewRangesCountActual].BaseAddress = 0;
+    NewRanges[NewRangesCountActual].Length      = OldRanges[0].BaseAddress;
+    NewRanges[NewRangesCountActual].Type        = DefaultType;
+    NewRangesCountActual++;
+  }
+
+  OldRangesIndex = 0;
+  while (OldRangesIndex < *EffectiveMtrrMemoryRangesCount) {
+    CurrentRangeTypeInOldRanges = OldRanges[OldRangesIndex].Type;
+    CurrentRangeInNewRanges = NULL;
+    if (NewRangesCountActual > 0)   // We need to check CurrentNewRange first before generate a new NewRange.
+    {
+      CurrentRangeInNewRanges = &NewRanges[NewRangesCountActual - 1];
+    }
+    if (CurrentRangeInNewRanges != NULL && CurrentRangeInNewRanges->Type == CurrentRangeTypeInOldRanges) {
+      CurrentRangeInNewRanges->Length += OldRanges[OldRangesIndex].Length;
+    } else {
+      NewRanges[NewRangesCountActual].BaseAddress = OldRanges[OldRangesIndex].BaseAddress;
+      NewRanges[NewRangesCountActual].Length     += OldRanges[OldRangesIndex].Length;
+      NewRanges[NewRangesCountActual].Type        = CurrentRangeTypeInOldRanges;
+      while (OldRangesIndex + 1 < *EffectiveMtrrMemoryRangesCount && OldRanges[OldRangesIndex + 1].Type == CurrentRangeTypeInOldRanges)
+      {
+        OldRangesIndex++;
+        NewRanges[NewRangesCountActual].Length += OldRanges[OldRangesIndex].Length;
+      }
+      NewRangesCountActual++;
+    }
+
+    OldRangesIndex++;
+  }
+
+  MaxAddress = (1ull << PhysicalAddressBits) - 1;
+  OldLastRange = OldRanges[(*EffectiveMtrrMemoryRangesCount) - 1];
+  CurrentRangeInNewRanges = &NewRanges[NewRangesCountActual - 1];
+  if (OldLastRange.BaseAddress + OldLastRange.Length - 1 < MaxAddress) {
+    if (CurrentRangeInNewRanges->Type == DefaultType) {
+      CurrentRangeInNewRanges->Length = MaxAddress - CurrentRangeInNewRanges->BaseAddress + 1;
+    } else {
+      NewRanges[NewRangesCountActual].BaseAddress = OldLastRange.BaseAddress + OldLastRange.Length;
+      NewRanges[NewRangesCountActual].Length = MaxAddress - NewRanges[NewRangesCountActual].BaseAddress + 1;
+      NewRanges[NewRangesCountActual].Type = DefaultType;
+      NewRangesCountActual++;
+    }
+  }
+
+  free (*EffectiveMtrrMemoryRanges);
+  *EffectiveMtrrMemoryRanges = NewRanges;
+  *EffectiveMtrrMemoryRangesCount = NewRangesCountActual;
+}
+
+/**
+  Collect all the endpoints in the raw memory ranges.
+
+  @param Endpoints           Return the collected endpoints.
+  @param EndPointCount       Return the count of endpoints.
+  @param RawMemoryRanges     Raw memory ranges.
+  @param RawMemoryRangeCount Count of raw memory ranges.
+**/
+VOID
+CollectEndpoints (
+  IN OUT UINT64        *Endpoints,
+  IN OUT UINT32        *EndPointCount,
+  IN MTRR_MEMORY_RANGE *RawMemoryRanges,
+  IN UINT32            RawMemoryRangeCount
+  )
+{
+  UINT32 Index;
+  UINT32 RawRangeIndex;
+
+  ASSERT ((RawMemoryRangeCount << 1) == *EndPointCount);
+
+  for (Index = 0; Index < *EndPointCount; Index += 2) {
+    RawRangeIndex = Index >> 1;
+    Endpoints[Index] = RawMemoryRanges[RawRangeIndex].BaseAddress;
+    Endpoints[Index + 1] = RawMemoryRanges[RawRangeIndex].BaseAddress + RawMemoryRanges[RawRangeIndex].Length - 1;
+  }
+
+  qsort (Endpoints, *EndPointCount, sizeof (UINT64), CompareFuncUint64);
+  RemoveDuplicatesInSortedArray (Endpoints, EndPointCount);
+}
+
+/**
+  Convert the MTRR BASE/MASK array to memory ranges.
+
+  @param DefaultType          Default memory type.
+  @param PhysicalAddressBits  Physical address bits.
+  @param RawMemoryRanges      Raw memory ranges.
+  @param RawMemoryRangeCount  Count of raw memory ranges.
+  @param MemoryRanges         Memory ranges.
+  @param MemoryRangeCount     Count of memory ranges.
+**/
+VOID
+GetEffectiveMemoryRanges (
+  IN MTRR_MEMORY_CACHE_TYPE DefaultType,
+  IN UINT32                 PhysicalAddressBits,
+  IN MTRR_MEMORY_RANGE      *RawMemoryRanges,
+  IN UINT32                 RawMemoryRangeCount,
+  OUT MTRR_MEMORY_RANGE     *MemoryRanges,
+  OUT UINTN                 *MemoryRangeCount
+  )
+{
+  UINTN                 Index;
+  UINT32                AllEndPointsCount;
+  UINT64                *AllEndPointsInclusive;
+  UINT32                AllRangePiecesCountMax;
+  MTRR_MEMORY_RANGE     *AllRangePieces;
+  UINTN                 AllRangePiecesCountActual;
+  UINT64                OverlapBitFlag1;
+  UINT64                OverlapBitFlag2;
+  INT32                 OverlapFlagRelation;
+
+  if (RawMemoryRangeCount == 0) {
+    MemoryRanges[0].BaseAddress = 0;
+    MemoryRanges[0].Length      = (1ull << PhysicalAddressBits);
+    MemoryRanges[0].Type        = DefaultType;
+    *MemoryRangeCount = 1;
+    return;
+  }
+
+  AllEndPointsCount         = RawMemoryRangeCount << 1;
+  AllEndPointsInclusive     = calloc (AllEndPointsCount, sizeof (UINT64));
+  AllRangePiecesCountMax    = RawMemoryRangeCount * 3 + 1;
+  AllRangePieces            = calloc (AllRangePiecesCountMax, sizeof (MTRR_MEMORY_RANGE));
+  CollectEndpoints (AllEndPointsInclusive, &AllEndPointsCount, RawMemoryRanges, RawMemoryRangeCount);
+
+  for (Index = 0, AllRangePiecesCountActual = 0; Index < AllEndPointsCount - 1; Index++) {
+    OverlapBitFlag1 = GetOverlapBitFlag (RawMemoryRanges, RawMemoryRangeCount, AllEndPointsInclusive[Index]);
+    OverlapBitFlag2 = GetOverlapBitFlag (RawMemoryRanges, RawMemoryRangeCount, AllEndPointsInclusive[Index + 1]);
+    OverlapFlagRelation = CheckOverlapBitFlagsRelation (OverlapBitFlag1, OverlapBitFlag2);
+    switch (OverlapFlagRelation) {
+      case 0:   // [1, 2]
+        AllRangePieces[AllRangePiecesCountActual].BaseAddress = AllEndPointsInclusive[Index];
+        AllRangePieces[AllRangePiecesCountActual].Length      = AllEndPointsInclusive[Index + 1] - AllEndPointsInclusive[Index] + 1;
+        AllRangePiecesCountActual++;
+        break;
+      case 1:   // [1, 2)
+        AllRangePieces[AllRangePiecesCountActual].BaseAddress = AllEndPointsInclusive[Index];
+        AllRangePieces[AllRangePiecesCountActual].Length      = (AllEndPointsInclusive[Index + 1] - 1) - AllEndPointsInclusive[Index] + 1;
+        AllRangePiecesCountActual++;
+        break;
+      case 2:   // (1, 2]
+        AllRangePieces[AllRangePiecesCountActual].BaseAddress = AllEndPointsInclusive[Index] + 1;
+        AllRangePieces[AllRangePiecesCountActual].Length      = AllEndPointsInclusive[Index + 1] - (AllEndPointsInclusive[Index] + 1) + 1;
+        AllRangePiecesCountActual++;
+
+        if (!IsEndpointInRanges (AllEndPointsInclusive[Index], AllRangePieces, AllRangePiecesCountActual)) {
+          AllRangePieces[AllRangePiecesCountActual].BaseAddress = AllEndPointsInclusive[Index];
+          AllRangePieces[AllRangePiecesCountActual].Length      = 1;
+          AllRangePiecesCountActual++;
+        }
+        break;
+      case 3:   // (1, 2)
+        AllRangePieces[AllRangePiecesCountActual].BaseAddress = AllEndPointsInclusive[Index] + 1;
+        AllRangePieces[AllRangePiecesCountActual].Length      = (AllEndPointsInclusive[Index + 1] - 1) - (AllEndPointsInclusive[Index] + 1) + 1;
+        if (AllRangePieces[AllRangePiecesCountActual].Length == 0)   // Only in case 3 can exists Length=0, we should skip such "segment".
+          break;
+        AllRangePiecesCountActual++;
+        if (!IsEndpointInRanges (AllEndPointsInclusive[Index], AllRangePieces, AllRangePiecesCountActual)) {
+          AllRangePieces[AllRangePiecesCountActual].BaseAddress = AllEndPointsInclusive[Index];
+          AllRangePieces[AllRangePiecesCountActual].Length      = 1;
+          AllRangePiecesCountActual++;
+        }
+        break;
+      default:
+        ASSERT (FALSE);
+    }
+  }
+
+  for (Index = 0; Index < AllRangePiecesCountActual; Index++) {
+    DetermineMemoryCacheType (DefaultType, &AllRangePieces[Index], RawMemoryRanges, RawMemoryRangeCount);
+  }
+
+  CompactAndExtendEffectiveMtrrMemoryRanges (DefaultType, PhysicalAddressBits, &AllRangePieces, &AllRangePiecesCountActual);
+  ASSERT (*MemoryRangeCount >= AllRangePiecesCountActual);
+  memcpy (MemoryRanges, AllRangePieces, AllRangePiecesCountActual * sizeof (MTRR_MEMORY_RANGE));
+  *MemoryRangeCount = AllRangePiecesCountActual;
+
+  free (AllEndPointsInclusive);
+  free (AllRangePieces);
+}
diff --git a/UefiCpuPkg/Test/UefiCpuPkgHostTest.dsc b/UefiCpuPkg/Test/UefiCpuPkgHostTest.dsc
new file mode 100644
index 0000000000..8a5c456830
--- /dev/null
+++ b/UefiCpuPkg/Test/UefiCpuPkgHostTest.dsc
@@ -0,0 +1,31 @@
+## @file
+# UefiCpuPkg DSC file used to build host-based unit tests.
+#
+# Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  PLATFORM_NAME           = UefiCpuPkgHostTest
+  PLATFORM_GUID           = E00B9599-5B74-4FF7-AB9F-8183FB13B2F9
+  PLATFORM_VERSION        = 0.1
+  DSC_SPECIFICATION       = 0x00010005
+  OUTPUT_DIRECTORY        = Build/UefiCpuPkg/HostTest
+  SUPPORTED_ARCHITECTURES = IA32|X64
+  BUILD_TARGETS           = NOOPT
+  SKUID_IDENTIFIER        = DEFAULT
+
+!include UnitTestFrameworkPkg/UnitTestFrameworkPkgHost.dsc.inc
+
+[LibraryClasses]
+  MtrrLib|UefiCpuPkg/Library/MtrrLib/MtrrLib.inf
+
+[PcdsPatchableInModule]
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuNumberOfReservedVariableMtrrs|0
+
+[Components]
+  #
+  # Build HOST_APPLICATION that tests the MtrrLib
+  #
+  UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTestHost.inf
diff --git a/UefiCpuPkg/UefiCpuPkg.ci.yaml b/UefiCpuPkg/UefiCpuPkg.ci.yaml
index d54651d438..140cb5a1b6 100644
--- a/UefiCpuPkg/UefiCpuPkg.ci.yaml
+++ b/UefiCpuPkg/UefiCpuPkg.ci.yaml
@@ -11,6 +11,10 @@
     "CompilerPlugin": {
         "DscPath": "UefiCpuPkg.dsc"
     },
+    ## options defined ci/Plugin/HostUnitTestCompilerPlugin
+    "HostUnitTestCompilerPlugin": {
+        "DscPath": "Test/UefiCpuPkgHostTest.dsc"
+    },
     "CharEncodingCheck": {
         "IgnoreFiles": []
     },
@@ -21,7 +25,9 @@
             "UefiCpuPkg/UefiCpuPkg.dec"
         ],
         # For host based unit tests
-        "AcceptableDependencies-HOST_APPLICATION":[],
+        "AcceptableDependencies-HOST_APPLICATION":[
+            "UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec"
+        ],
         # For UEFI shell based apps
         "AcceptableDependencies-UEFI_APPLICATION":[],
         "IgnoreInf": []
@@ -33,6 +39,10 @@
             "UefiCpuPkg/ResetVector/Vtf0/Vtf0.inf"
         ]
     },
+    "HostUnitTestDscCompleteCheck": {
+        "IgnoreInf": [""],
+        "DscPath": "Test/UefiCpuPkgHostTest.dsc"
+    },
     "GuidCheck": {
         "IgnoreGuidName": ["SecCore", "ResetVector"], # Expected duplication for gEfiFirmwareVolumeTopFileGuid
         "IgnoreGuidValue": [],
author	Ray Ni <ray.ni@intel.com>	2020-05-20 05:13:11 +0800
committer	mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>	2020-08-12 11:38:37 +0000
commit	e17f459af2594b6ccbb8d56064737b8a23414b76 (patch)
tree	9899a0603e5a071ec4ffafa49ba5c3c89cfd8816
parent	be01087e07809d20aa2db27b37029c324c824407 (diff)
download	edk2-e17f459af2594b6ccbb8d56064737b8a23414b76.tar.gz edk2-e17f459af2594b6ccbb8d56064737b8a23414b76.tar.bz2 edk2-e17f459af2594b6ccbb8d56064737b8a23414b76.zip