MdeModulePkg/Core/PiSmmCore/Pool.c - device/linaro/bootloader/edk2 - Git at Google

 /** @file
   SMM Memory pool management functions.

   Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials are licensed and made available
   under the terms and conditions of the BSD License which accompanies this
   distribution.  The full text of the license may be found at
   http://opensource.org/licenses/bsd-license.php

   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

 **/

 #include "PiSmmCore.h"

 LIST_ENTRY  mSmmPoolLists[MAX_POOL_INDEX];
 //
 // To cache the SMRAM base since when Loading modules At fixed address feature is enabled,
 // all module is assigned an offset relative the SMRAM base in build time.
 //
 GLOBAL_REMOVE_IF_UNREFERENCED  EFI_PHYSICAL_ADDRESS       gLoadModuleAtFixAddressSmramBase = 0;

 /**
   Called to initialize the memory service.

   @param   SmramRangeCount       Number of SMRAM Regions
   @param   SmramRanges           Pointer to SMRAM Descriptors

 **/
 VOID
 SmmInitializeMemoryServices (
   IN UINTN                 SmramRangeCount,
   IN EFI_SMRAM_DESCRIPTOR  *SmramRanges
   )
 {
   UINTN                  Index;
  	UINT64                 SmmCodeSize;
  	UINTN                  CurrentSmramRangesIndex;
  	UINT64                 MaxSize;

   //
   // Initialize Pool list
   //
   for (Index = ARRAY_SIZE (mSmmPoolLists); Index > 0;) {
     InitializeListHead (&mSmmPoolLists[--Index]);
   }
   CurrentSmramRangesIndex = 0;
   //
   // If Loading Module At fixed Address feature is enabled, cache the SMRAM base here
   //
   if (PcdGet64(PcdLoadModuleAtFixAddressEnable) != 0) {
     //
     // Build tool will calculate the smm code size and then patch the PcdLoadFixAddressSmmCodePageNumber
     //
     SmmCodeSize = LShiftU64 (PcdGet32(PcdLoadFixAddressSmmCodePageNumber), EFI_PAGE_SHIFT);

     //
     // Find the largest SMRAM range between 1MB and 4GB that is at least 256KB - 4K in size
     //
     for (Index = 0, MaxSize = SIZE_256KB - EFI_PAGE_SIZE; Index < SmramRangeCount; Index++) {
       //
       // Skip any SMRAM region that is already allocated, needs testing, or needs ECC initialization
       //
       if ((SmramRanges[Index].RegionState & (EFI_ALLOCATED | EFI_NEEDS_TESTING | EFI_NEEDS_ECC_INITIALIZATION)) != 0) {
         continue;
       }

       if (SmramRanges[Index].CpuStart >= BASE_1MB) {
         if ((SmramRanges[Index].CpuStart + SmramRanges[Index].PhysicalSize - 1) <= MAX_ADDRESS) {
           if (SmramRanges[Index].PhysicalSize >= MaxSize) {
             MaxSize = SmramRanges[Index].PhysicalSize;
             CurrentSmramRangesIndex = Index;
           }
         }
       }
     }
     gLoadModuleAtFixAddressSmramBase = SmramRanges[CurrentSmramRangesIndex].CpuStart;

     //
     // cut out a memory range from this SMRAM range with the size SmmCodeSize to hold SMM driver code
     // A notable thing is that SMM core is already loaded into this range.
     //
     SmramRanges[CurrentSmramRangesIndex].CpuStart     = SmramRanges[CurrentSmramRangesIndex].CpuStart + SmmCodeSize;
     SmramRanges[CurrentSmramRangesIndex].PhysicalSize = SmramRanges[CurrentSmramRangesIndex].PhysicalSize - SmmCodeSize;
   }
   //
   // Initialize free SMRAM regions
   // Need add Free memory at first, to let gSmmMemoryMap record data
   //
   for (Index = 0; Index < SmramRangeCount; Index++) {
     if ((SmramRanges[Index].RegionState & (EFI_ALLOCATED | EFI_NEEDS_TESTING | EFI_NEEDS_ECC_INITIALIZATION)) != 0) {
       continue;
     }
     SmmAddMemoryRegion (
       SmramRanges[Index].CpuStart,
       SmramRanges[Index].PhysicalSize,
       EfiConventionalMemory,
       SmramRanges[Index].RegionState
       );
   }

   for (Index = 0; Index < SmramRangeCount; Index++) {
     if ((SmramRanges[Index].RegionState & (EFI_ALLOCATED | EFI_NEEDS_TESTING | EFI_NEEDS_ECC_INITIALIZATION)) == 0) {
       continue;
     }
     SmmAddMemoryRegion (
       SmramRanges[Index].CpuStart,
       SmramRanges[Index].PhysicalSize,
       EfiConventionalMemory,
       SmramRanges[Index].RegionState
       );
   }

 }

 /**
   Internal Function. Allocate a pool by specified PoolIndex.

   @param  PoolIndex             Index which indicate the Pool size.
   @param  FreePoolHdr           The returned Free pool.

   @retval EFI_OUT_OF_RESOURCES   Allocation failed.
   @retval EFI_SUCCESS            Pool successfully allocated.

 **/
 EFI_STATUS
 InternalAllocPoolByIndex (
   IN  UINTN             PoolIndex,
   OUT FREE_POOL_HEADER  **FreePoolHdr
   )
 {
   EFI_STATUS            Status;
   FREE_POOL_HEADER      *Hdr;
   EFI_PHYSICAL_ADDRESS  Address;

   ASSERT (PoolIndex <= MAX_POOL_INDEX);
   Status = EFI_SUCCESS;
   Hdr = NULL;
   if (PoolIndex == MAX_POOL_INDEX) {
     Status = SmmInternalAllocatePages (AllocateAnyPages, EfiRuntimeServicesData, EFI_SIZE_TO_PAGES (MAX_POOL_SIZE << 1), &Address);
     if (EFI_ERROR (Status)) {
       return EFI_OUT_OF_RESOURCES;
     }
     Hdr = (FREE_POOL_HEADER *) (UINTN) Address;
   } else if (!IsListEmpty (&mSmmPoolLists[PoolIndex])) {
     Hdr = BASE_CR (GetFirstNode (&mSmmPoolLists[PoolIndex]), FREE_POOL_HEADER, Link);
     RemoveEntryList (&Hdr->Link);
   } else {
     Status = InternalAllocPoolByIndex (PoolIndex + 1, &Hdr);
     if (!EFI_ERROR (Status)) {
       Hdr->Header.Size >>= 1;
       Hdr->Header.Available = TRUE;
       InsertHeadList (&mSmmPoolLists[PoolIndex], &Hdr->Link);
       Hdr = (FREE_POOL_HEADER*)((UINT8*)Hdr + Hdr->Header.Size);
     }
   }

   if (!EFI_ERROR (Status)) {
     Hdr->Header.Size = MIN_POOL_SIZE << PoolIndex;
     Hdr->Header.Available = FALSE;
   }

   *FreePoolHdr = Hdr;
   return Status;
 }

 /**
   Internal Function. Free a pool by specified PoolIndex.

   @param  FreePoolHdr           The pool to free.

   @retval EFI_SUCCESS           Pool successfully freed.

 **/
 EFI_STATUS
 InternalFreePoolByIndex (
   IN FREE_POOL_HEADER  *FreePoolHdr
   )
 {
   UINTN  PoolIndex;

   ASSERT ((FreePoolHdr->Header.Size & (FreePoolHdr->Header.Size - 1)) == 0);
   ASSERT (((UINTN)FreePoolHdr & (FreePoolHdr->Header.Size - 1)) == 0);
   ASSERT (FreePoolHdr->Header.Size >= MIN_POOL_SIZE);

   PoolIndex = (UINTN) (HighBitSet32 ((UINT32)FreePoolHdr->Header.Size) - MIN_POOL_SHIFT);
   FreePoolHdr->Header.Available = TRUE;
   ASSERT (PoolIndex < MAX_POOL_INDEX);
   InsertHeadList (&mSmmPoolLists[PoolIndex], &FreePoolHdr->Link);
   return EFI_SUCCESS;
 }

 /**
   Allocate pool of a particular type.

   @param  PoolType               Type of pool to allocate.
   @param  Size                   The amount of pool to allocate.
   @param  Buffer                 The address to return a pointer to the allocated
                                  pool.

   @retval EFI_INVALID_PARAMETER  PoolType not valid.
   @retval EFI_OUT_OF_RESOURCES   Size exceeds max pool size or allocation failed.
   @retval EFI_SUCCESS            Pool successfully allocated.

 **/
 EFI_STATUS
 EFIAPI
 SmmInternalAllocatePool (
   IN   EFI_MEMORY_TYPE  PoolType,
   IN   UINTN            Size,
   OUT  VOID             **Buffer
   )
 {
   POOL_HEADER           *PoolHdr;
   FREE_POOL_HEADER      *FreePoolHdr;
   EFI_STATUS            Status;
   EFI_PHYSICAL_ADDRESS  Address;
   UINTN                 PoolIndex;

   if (PoolType != EfiRuntimeServicesCode &&
       PoolType != EfiRuntimeServicesData) {
     return EFI_INVALID_PARAMETER;
   }

   Size += sizeof (*PoolHdr);
   if (Size > MAX_POOL_SIZE) {
     Size = EFI_SIZE_TO_PAGES (Size);
     Status = SmmInternalAllocatePages (AllocateAnyPages, PoolType, Size, &Address);
     if (EFI_ERROR (Status)) {
       return Status;
     }

     PoolHdr = (POOL_HEADER*)(UINTN)Address;
     PoolHdr->Size = EFI_PAGES_TO_SIZE (Size);
     PoolHdr->Available = FALSE;
     *Buffer = PoolHdr + 1;
     return Status;
   }

   Size = (Size + MIN_POOL_SIZE - 1) >> MIN_POOL_SHIFT;
   PoolIndex = (UINTN) HighBitSet32 ((UINT32)Size);
   if ((Size & (Size - 1)) != 0) {
     PoolIndex++;
   }

   Status = InternalAllocPoolByIndex (PoolIndex, &FreePoolHdr);
   if (!EFI_ERROR(Status)) {
     *Buffer = &FreePoolHdr->Header + 1;
   }
   return Status;
 }

 /**
   Allocate pool of a particular type.

   @param  PoolType               Type of pool to allocate.
   @param  Size                   The amount of pool to allocate.
   @param  Buffer                 The address to return a pointer to the allocated
                                  pool.

   @retval EFI_INVALID_PARAMETER  PoolType not valid.
   @retval EFI_OUT_OF_RESOURCES   Size exceeds max pool size or allocation failed.
   @retval EFI_SUCCESS            Pool successfully allocated.

 **/
 EFI_STATUS
 EFIAPI
 SmmAllocatePool (
   IN   EFI_MEMORY_TYPE  PoolType,
   IN   UINTN            Size,
   OUT  VOID             **Buffer
   )
 {
   EFI_STATUS  Status;

   Status = SmmInternalAllocatePool (PoolType, Size, Buffer);
   if (!EFI_ERROR (Status)) {
     SmmCoreUpdateProfile (
       (EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0),
       MemoryProfileActionAllocatePool,
       PoolType,
       Size,
       *Buffer,
       NULL
       );
   }
   return Status;
 }

 /**
   Frees pool.

   @param  Buffer                 The allocated pool entry to free.

   @retval EFI_INVALID_PARAMETER  Buffer is not a valid value.
   @retval EFI_SUCCESS            Pool successfully freed.

 **/
 EFI_STATUS
 EFIAPI
 SmmInternalFreePool (
   IN VOID  *Buffer
   )
 {
   FREE_POOL_HEADER  *FreePoolHdr;

   if (Buffer == NULL) {
     return EFI_INVALID_PARAMETER;
   }

   FreePoolHdr = (FREE_POOL_HEADER*)((POOL_HEADER*)Buffer - 1);
   ASSERT (!FreePoolHdr->Header.Available);

   if (FreePoolHdr->Header.Size > MAX_POOL_SIZE) {
     ASSERT (((UINTN)FreePoolHdr & EFI_PAGE_MASK) == 0);
     ASSERT ((FreePoolHdr->Header.Size & EFI_PAGE_MASK) == 0);
     return SmmInternalFreePages (
              (EFI_PHYSICAL_ADDRESS)(UINTN)FreePoolHdr,
              EFI_SIZE_TO_PAGES (FreePoolHdr->Header.Size)
              );
   }
   return InternalFreePoolByIndex (FreePoolHdr);
 }

 /**
   Frees pool.

   @param  Buffer                 The allocated pool entry to free.

   @retval EFI_INVALID_PARAMETER  Buffer is not a valid value.
   @retval EFI_SUCCESS            Pool successfully freed.

 **/
 EFI_STATUS
 EFIAPI
 SmmFreePool (
   IN VOID  *Buffer
   )
 {
   EFI_STATUS  Status;

   Status = SmmInternalFreePool (Buffer);
   if (!EFI_ERROR (Status)) {
     SmmCoreUpdateProfile (
       (EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0),
       MemoryProfileActionFreePool,
       EfiMaxMemoryType,
       0,
       Buffer,
       NULL
       );
   }
   return Status;
 }
	/** @file
	SMM Memory pool management functions.

	Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
	This program and the accompanying materials are licensed and made available
	under the terms and conditions of the BSD License which accompanies this
	distribution. The full text of the license may be found at
	http://opensource.org/licenses/bsd-license.php

	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	**/

	#include "PiSmmCore.h"

	LIST_ENTRY mSmmPoolLists[MAX_POOL_INDEX];
	//
	// To cache the SMRAM base since when Loading modules At fixed address feature is enabled,
	// all module is assigned an offset relative the SMRAM base in build time.
	//
	GLOBAL_REMOVE_IF_UNREFERENCED EFI_PHYSICAL_ADDRESS gLoadModuleAtFixAddressSmramBase = 0;

	/**
	Called to initialize the memory service.

	@param SmramRangeCount Number of SMRAM Regions
	@param SmramRanges Pointer to SMRAM Descriptors

	**/
	VOID
	SmmInitializeMemoryServices (
	IN UINTN SmramRangeCount,
	IN EFI_SMRAM_DESCRIPTOR *SmramRanges
	)
	{
	UINTN Index;
	UINT64 SmmCodeSize;
	UINTN CurrentSmramRangesIndex;
	UINT64 MaxSize;

	//
	// Initialize Pool list
	//
	for (Index = ARRAY_SIZE (mSmmPoolLists); Index > 0;) {
	InitializeListHead (&mSmmPoolLists[--Index]);
	}
	CurrentSmramRangesIndex = 0;
	//
	// If Loading Module At fixed Address feature is enabled, cache the SMRAM base here
	//
	if (PcdGet64(PcdLoadModuleAtFixAddressEnable) != 0) {
	//
	// Build tool will calculate the smm code size and then patch the PcdLoadFixAddressSmmCodePageNumber
	//
	SmmCodeSize = LShiftU64 (PcdGet32(PcdLoadFixAddressSmmCodePageNumber), EFI_PAGE_SHIFT);

	//
	// Find the largest SMRAM range between 1MB and 4GB that is at least 256KB - 4K in size
	//
	for (Index = 0, MaxSize = SIZE_256KB - EFI_PAGE_SIZE; Index < SmramRangeCount; Index++) {
	//
	// Skip any SMRAM region that is already allocated, needs testing, or needs ECC initialization
	//
	if ((SmramRanges[Index].RegionState & (EFI_ALLOCATED \| EFI_NEEDS_TESTING \| EFI_NEEDS_ECC_INITIALIZATION)) != 0) {
	continue;
	}

	if (SmramRanges[Index].CpuStart >= BASE_1MB) {
	if ((SmramRanges[Index].CpuStart + SmramRanges[Index].PhysicalSize - 1) <= MAX_ADDRESS) {
	if (SmramRanges[Index].PhysicalSize >= MaxSize) {
	MaxSize = SmramRanges[Index].PhysicalSize;
	CurrentSmramRangesIndex = Index;
	}
	}
	}
	}
	gLoadModuleAtFixAddressSmramBase = SmramRanges[CurrentSmramRangesIndex].CpuStart;

	//
	// cut out a memory range from this SMRAM range with the size SmmCodeSize to hold SMM driver code
	// A notable thing is that SMM core is already loaded into this range.
	//
	SmramRanges[CurrentSmramRangesIndex].CpuStart = SmramRanges[CurrentSmramRangesIndex].CpuStart + SmmCodeSize;
	SmramRanges[CurrentSmramRangesIndex].PhysicalSize = SmramRanges[CurrentSmramRangesIndex].PhysicalSize - SmmCodeSize;
	}
	//
	// Initialize free SMRAM regions
	// Need add Free memory at first, to let gSmmMemoryMap record data
	//
	for (Index = 0; Index < SmramRangeCount; Index++) {
	if ((SmramRanges[Index].RegionState & (EFI_ALLOCATED \| EFI_NEEDS_TESTING \| EFI_NEEDS_ECC_INITIALIZATION)) != 0) {
	continue;
	}
	SmmAddMemoryRegion (
	SmramRanges[Index].CpuStart,
	SmramRanges[Index].PhysicalSize,
	EfiConventionalMemory,
	SmramRanges[Index].RegionState
	);
	}

	for (Index = 0; Index < SmramRangeCount; Index++) {
	if ((SmramRanges[Index].RegionState & (EFI_ALLOCATED \| EFI_NEEDS_TESTING \| EFI_NEEDS_ECC_INITIALIZATION)) == 0) {
	continue;
	}
	SmmAddMemoryRegion (
	SmramRanges[Index].CpuStart,
	SmramRanges[Index].PhysicalSize,
	EfiConventionalMemory,
	SmramRanges[Index].RegionState
	);
	}

	}

	/**
	Internal Function. Allocate a pool by specified PoolIndex.

	@param PoolIndex Index which indicate the Pool size.
	@param FreePoolHdr The returned Free pool.

	@retval EFI_OUT_OF_RESOURCES Allocation failed.
	@retval EFI_SUCCESS Pool successfully allocated.

	**/
	EFI_STATUS
	InternalAllocPoolByIndex (
	IN UINTN PoolIndex,
	OUT FREE_POOL_HEADER **FreePoolHdr
	)
	{
	EFI_STATUS Status;
	FREE_POOL_HEADER *Hdr;
	EFI_PHYSICAL_ADDRESS Address;

	ASSERT (PoolIndex <= MAX_POOL_INDEX);
	Status = EFI_SUCCESS;
	Hdr = NULL;
	if (PoolIndex == MAX_POOL_INDEX) {
	Status = SmmInternalAllocatePages (AllocateAnyPages, EfiRuntimeServicesData, EFI_SIZE_TO_PAGES (MAX_POOL_SIZE << 1), &Address);
	if (EFI_ERROR (Status)) {
	return EFI_OUT_OF_RESOURCES;
	}
	Hdr = (FREE_POOL_HEADER *) (UINTN) Address;
	} else if (!IsListEmpty (&mSmmPoolLists[PoolIndex])) {
	Hdr = BASE_CR (GetFirstNode (&mSmmPoolLists[PoolIndex]), FREE_POOL_HEADER, Link);
	RemoveEntryList (&Hdr->Link);
	} else {
	Status = InternalAllocPoolByIndex (PoolIndex + 1, &Hdr);
	if (!EFI_ERROR (Status)) {
	Hdr->Header.Size >>= 1;
	Hdr->Header.Available = TRUE;
	InsertHeadList (&mSmmPoolLists[PoolIndex], &Hdr->Link);
	Hdr = (FREE_POOL_HEADER)((UINT8)Hdr + Hdr->Header.Size);
	}
	}

	if (!EFI_ERROR (Status)) {
	Hdr->Header.Size = MIN_POOL_SIZE << PoolIndex;
	Hdr->Header.Available = FALSE;
	}

	*FreePoolHdr = Hdr;
	return Status;
	}

	/**
	Internal Function. Free a pool by specified PoolIndex.

	@param FreePoolHdr The pool to free.

	@retval EFI_SUCCESS Pool successfully freed.

	**/
	EFI_STATUS
	InternalFreePoolByIndex (
	IN FREE_POOL_HEADER *FreePoolHdr
	)
	{
	UINTN PoolIndex;

	ASSERT ((FreePoolHdr->Header.Size & (FreePoolHdr->Header.Size - 1)) == 0);
	ASSERT (((UINTN)FreePoolHdr & (FreePoolHdr->Header.Size - 1)) == 0);
	ASSERT (FreePoolHdr->Header.Size >= MIN_POOL_SIZE);

	PoolIndex = (UINTN) (HighBitSet32 ((UINT32)FreePoolHdr->Header.Size) - MIN_POOL_SHIFT);
	FreePoolHdr->Header.Available = TRUE;
	ASSERT (PoolIndex < MAX_POOL_INDEX);
	InsertHeadList (&mSmmPoolLists[PoolIndex], &FreePoolHdr->Link);
	return EFI_SUCCESS;
	}

	/**
	Allocate pool of a particular type.

	@param PoolType Type of pool to allocate.
	@param Size The amount of pool to allocate.
	@param Buffer The address to return a pointer to the allocated
	pool.

	@retval EFI_INVALID_PARAMETER PoolType not valid.
	@retval EFI_OUT_OF_RESOURCES Size exceeds max pool size or allocation failed.
	@retval EFI_SUCCESS Pool successfully allocated.

	**/
	EFI_STATUS
	EFIAPI
	SmmInternalAllocatePool (
	IN EFI_MEMORY_TYPE PoolType,
	IN UINTN Size,
	OUT VOID **Buffer
	)
	{
	POOL_HEADER *PoolHdr;
	FREE_POOL_HEADER *FreePoolHdr;
	EFI_STATUS Status;
	EFI_PHYSICAL_ADDRESS Address;
	UINTN PoolIndex;

	if (PoolType != EfiRuntimeServicesCode &&
	PoolType != EfiRuntimeServicesData) {
	return EFI_INVALID_PARAMETER;
	}

	Size += sizeof (*PoolHdr);
	if (Size > MAX_POOL_SIZE) {
	Size = EFI_SIZE_TO_PAGES (Size);
	Status = SmmInternalAllocatePages (AllocateAnyPages, PoolType, Size, &Address);
	if (EFI_ERROR (Status)) {
	return Status;
	}

	PoolHdr = (POOL_HEADER*)(UINTN)Address;
	PoolHdr->Size = EFI_PAGES_TO_SIZE (Size);
	PoolHdr->Available = FALSE;
	*Buffer = PoolHdr + 1;
	return Status;
	}

	Size = (Size + MIN_POOL_SIZE - 1) >> MIN_POOL_SHIFT;
	PoolIndex = (UINTN) HighBitSet32 ((UINT32)Size);
	if ((Size & (Size - 1)) != 0) {
	PoolIndex++;
	}

	Status = InternalAllocPoolByIndex (PoolIndex, &FreePoolHdr);
	if (!EFI_ERROR(Status)) {
	*Buffer = &FreePoolHdr->Header + 1;
	}
	return Status;
	}

	/**
	Allocate pool of a particular type.

	@param PoolType Type of pool to allocate.
	@param Size The amount of pool to allocate.
	@param Buffer The address to return a pointer to the allocated
	pool.

	@retval EFI_INVALID_PARAMETER PoolType not valid.
	@retval EFI_OUT_OF_RESOURCES Size exceeds max pool size or allocation failed.
	@retval EFI_SUCCESS Pool successfully allocated.

	**/
	EFI_STATUS
	EFIAPI
	SmmAllocatePool (
	IN EFI_MEMORY_TYPE PoolType,
	IN UINTN Size,
	OUT VOID **Buffer
	)
	{
	EFI_STATUS Status;

	Status = SmmInternalAllocatePool (PoolType, Size, Buffer);
	if (!EFI_ERROR (Status)) {
	SmmCoreUpdateProfile (
	(EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0),
	MemoryProfileActionAllocatePool,
	PoolType,
	Size,
	*Buffer,
	NULL
	);
	}
	return Status;
	}

	/**
	Frees pool.

	@param Buffer The allocated pool entry to free.

	@retval EFI_INVALID_PARAMETER Buffer is not a valid value.
	@retval EFI_SUCCESS Pool successfully freed.

	**/
	EFI_STATUS
	EFIAPI
	SmmInternalFreePool (
	IN VOID *Buffer
	)
	{
	FREE_POOL_HEADER *FreePoolHdr;

	if (Buffer == NULL) {
	return EFI_INVALID_PARAMETER;
	}

	FreePoolHdr = (FREE_POOL_HEADER)((POOL_HEADER)Buffer - 1);
	ASSERT (!FreePoolHdr->Header.Available);

	if (FreePoolHdr->Header.Size > MAX_POOL_SIZE) {
	ASSERT (((UINTN)FreePoolHdr & EFI_PAGE_MASK) == 0);
	ASSERT ((FreePoolHdr->Header.Size & EFI_PAGE_MASK) == 0);
	return SmmInternalFreePages (
	(EFI_PHYSICAL_ADDRESS)(UINTN)FreePoolHdr,
	EFI_SIZE_TO_PAGES (FreePoolHdr->Header.Size)
	);
	}
	return InternalFreePoolByIndex (FreePoolHdr);
	}

	/**
	Frees pool.

	@param Buffer The allocated pool entry to free.

	@retval EFI_INVALID_PARAMETER Buffer is not a valid value.
	@retval EFI_SUCCESS Pool successfully freed.

	**/
	EFI_STATUS
	EFIAPI
	SmmFreePool (
	IN VOID *Buffer
	)
	{
	EFI_STATUS Status;

	Status = SmmInternalFreePool (Buffer);
	if (!EFI_ERROR (Status)) {
	SmmCoreUpdateProfile (
	(EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0),
	MemoryProfileActionFreePool,
	EfiMaxMemoryType,
	0,
	Buffer,
	NULL
	);
	}
	return Status;
	}