diff options
Diffstat (limited to 'MdePkg/Library/SmmMemoryAllocationLib/MemoryAllocationLib.c')
| -rw-r--r-- | MdePkg/Library/SmmMemoryAllocationLib/MemoryAllocationLib.c | 823 |
1 files changed, 823 insertions, 0 deletions
diff --git a/MdePkg/Library/SmmMemoryAllocationLib/MemoryAllocationLib.c b/MdePkg/Library/SmmMemoryAllocationLib/MemoryAllocationLib.c new file mode 100644 index 0000000000..018d57ee3f --- /dev/null +++ b/MdePkg/Library/SmmMemoryAllocationLib/MemoryAllocationLib.c @@ -0,0 +1,823 @@ +/** @file
+ Support routines for memory allocation routines based
+ on SMM Services Table services for SMM phase drivers.
+
+ The PI System Management Mode Core Interface Specification only allows the use
+ of EfiRuntimeServicesCode and EfiRuntimeServicesData memory types for memory
+ allocations through the SMM Services Table. The functions in the Memory
+ Allocation Library use EfiBootServicesData as the default memory allocation
+ type. For this SMM specific instance of the Memory Allocation Library,
+ EfiRuntimeServicesData is used as the default memory type for all allocations.
+ In addition, allocation for the Reserved memory types are not supported and
+ will always return NULL.
+
+ Copyright (c) 2006 - 2010, Intel Corporation<BR>
+ All rights reserved. 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 <PiSmm.h>
+
+#include <Library/MemoryAllocationLib.h>
+#include <Library/SmmServicesTableLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+
+/**
+ Allocates one or more 4KB pages of a certain memory type.
+
+ Allocates the number of 4KB pages of a certain memory type and returns a pointer to the allocated
+ buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL is returned.
+ If there is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ @param MemoryType The type of memory to allocate.
+ @param Pages The number of 4 KB pages to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+InternalAllocatePages (
+ IN EFI_MEMORY_TYPE MemoryType,
+ IN UINTN Pages
+ )
+{
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS Memory;
+
+ if (Pages == 0) {
+ return NULL;
+ }
+
+ Status = gSmst->SmmAllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
+ if (EFI_ERROR (Status)) {
+ return NULL;
+ }
+ return (VOID *) (UINTN) Memory;
+}
+
+/**
+ Allocates one or more 4KB pages of type EfiBootServicesData.
+
+ Allocates the number of 4KB pages of type EfiBootServicesData and returns a pointer to the
+ allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
+ is returned. If there is not enough memory remaining to satisfy the request, then NULL is
+ returned.
+
+ @param Pages The number of 4 KB pages to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocatePages (
+ IN UINTN Pages
+ )
+{
+ return InternalAllocatePages (EfiRuntimeServicesData, Pages);
+}
+
+/**
+ Allocates one or more 4KB pages of type EfiRuntimeServicesData.
+
+ Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
+ allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
+ is returned. If there is not enough memory remaining to satisfy the request, then NULL is
+ returned.
+
+ @param Pages The number of 4 KB pages to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateRuntimePages (
+ IN UINTN Pages
+ )
+{
+ return InternalAllocatePages (EfiRuntimeServicesData, Pages);
+}
+
+/**
+ Allocates one or more 4KB pages of type EfiReservedMemoryType.
+
+ Allocates the number of 4KB pages of type EfiReservedMemoryType and returns a pointer to the
+ allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
+ is returned. If there is not enough memory remaining to satisfy the request, then NULL is
+ returned.
+
+ @param Pages The number of 4 KB pages to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateReservedPages (
+ IN UINTN Pages
+ )
+{
+ return NULL;
+}
+
+/**
+ Frees one or more 4KB pages that were previously allocated with one of the page allocation
+ functions in the Memory Allocation Library.
+
+ Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer
+ must have been allocated on a previous call to the page allocation services of the Memory
+ Allocation Library. If it is not possible to free allocated pages, then this function will
+ perform no actions.
+
+ If Buffer was not allocated with a page allocation function in the Memory Allocation Library,
+ then ASSERT().
+ If Pages is zero, then ASSERT().
+
+ @param Buffer Pointer to the buffer of pages to free.
+ @param Pages The number of 4 KB pages to free.
+
+**/
+VOID
+EFIAPI
+FreePages (
+ IN VOID *Buffer,
+ IN UINTN Pages
+ )
+{
+ EFI_STATUS Status;
+
+ ASSERT (Pages != 0);
+ Status = gSmst->SmmFreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Buffer, Pages);
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Allocates one or more 4KB pages of a certain memory type at a specified alignment.
+
+ Allocates the number of 4KB pages specified by Pages of a certain memory type with an alignment
+ specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is returned.
+ If there is not enough memory at the specified alignment remaining to satisfy the request, then
+ NULL is returned.
+ If Alignment is not a power of two and Alignment is not zero, then ASSERT().
+
+ @param MemoryType The type of memory to allocate.
+ @param Pages The number of 4 KB pages to allocate.
+ @param Alignment The requested alignment of the allocation. Must be a power of two.
+ If Alignment is zero, then byte alignment is used.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+InternalAllocateAlignedPages (
+ IN EFI_MEMORY_TYPE MemoryType,
+ IN UINTN Pages,
+ IN UINTN Alignment
+ )
+{
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS Memory;
+ UINTN AlignedMemory;
+ UINTN AlignmentMask;
+ UINTN UnalignedPages;
+ UINTN RealPages;
+
+ //
+ // Alignment must be a power of two or zero.
+ //
+ ASSERT ((Alignment & (Alignment - 1)) == 0);
+
+ if (Pages == 0) {
+ return NULL;
+ }
+ if (Alignment > EFI_PAGE_SIZE) {
+ //
+ // Caculate the total number of pages since alignment is larger than page size.
+ //
+ AlignmentMask = Alignment - 1;
+ RealPages = Pages + EFI_SIZE_TO_PAGES (Alignment);
+ //
+ // Make sure that Pages plus EFI_SIZE_TO_PAGES (Alignment) does not overflow.
+ //
+ ASSERT (RealPages > Pages);
+
+ Status = gSmst->SmmAllocatePages (AllocateAnyPages, MemoryType, RealPages, &Memory);
+ if (EFI_ERROR (Status)) {
+ return NULL;
+ }
+ AlignedMemory = ((UINTN) Memory + AlignmentMask) & ~AlignmentMask;
+ UnalignedPages = EFI_SIZE_TO_PAGES (AlignedMemory - (UINTN) Memory);
+ if (UnalignedPages > 0) {
+ //
+ // Free first unaligned page(s).
+ //
+ Status = gSmst->SmmFreePages (Memory, UnalignedPages);
+ ASSERT_EFI_ERROR (Status);
+ }
+ Memory = (EFI_PHYSICAL_ADDRESS) (AlignedMemory + EFI_PAGES_TO_SIZE (Pages));
+ UnalignedPages = RealPages - Pages - UnalignedPages;
+ if (UnalignedPages > 0) {
+ //
+ // Free last unaligned page(s).
+ //
+ Status = gSmst->SmmFreePages (Memory, UnalignedPages);
+ ASSERT_EFI_ERROR (Status);
+ }
+ } else {
+ //
+ // Do not over-allocate pages in this case.
+ //
+ Status = gSmst->SmmAllocatePages (AllocateAnyPages, MemoryType, Pages, &Memory);
+ if (EFI_ERROR (Status)) {
+ return NULL;
+ }
+ AlignedMemory = (UINTN) Memory;
+ }
+ return (VOID *) AlignedMemory;
+}
+
+/**
+ Allocates one or more 4KB pages of type EfiBootServicesData at a specified alignment.
+
+ Allocates the number of 4KB pages specified by Pages of type EfiBootServicesData with an
+ alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
+ returned. If there is not enough memory at the specified alignment remaining to satisfy the
+ request, then NULL is returned.
+
+ If Alignment is not a power of two and Alignment is not zero, then ASSERT().
+
+ @param Pages The number of 4 KB pages to allocate.
+ @param Alignment The requested alignment of the allocation. Must be a power of two.
+ If Alignment is zero, then byte alignment is used.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateAlignedPages (
+ IN UINTN Pages,
+ IN UINTN Alignment
+ )
+{
+ return InternalAllocateAlignedPages (EfiRuntimeServicesData, Pages, Alignment);
+}
+
+/**
+ Allocates one or more 4KB pages of type EfiRuntimeServicesData at a specified alignment.
+
+ Allocates the number of 4KB pages specified by Pages of type EfiRuntimeServicesData with an
+ alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
+ returned. If there is not enough memory at the specified alignment remaining to satisfy the
+ request, then NULL is returned.
+
+ If Alignment is not a power of two and Alignment is not zero, then ASSERT().
+
+ @param Pages The number of 4 KB pages to allocate.
+ @param Alignment The requested alignment of the allocation. Must be a power of two.
+ If Alignment is zero, then byte alignment is used.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateAlignedRuntimePages (
+ IN UINTN Pages,
+ IN UINTN Alignment
+ )
+{
+ return InternalAllocateAlignedPages (EfiRuntimeServicesData, Pages, Alignment);
+}
+
+/**
+ Allocates one or more 4KB pages of type EfiReservedMemoryType at a specified alignment.
+
+ Allocates the number of 4KB pages specified by Pages of type EfiReservedMemoryType with an
+ alignment specified by Alignment. The allocated buffer is returned. If Pages is 0, then NULL is
+ returned. If there is not enough memory at the specified alignment remaining to satisfy the
+ request, then NULL is returned.
+
+ If Alignment is not a power of two and Alignment is not zero, then ASSERT().
+
+ @param Pages The number of 4 KB pages to allocate.
+ @param Alignment The requested alignment of the allocation. Must be a power of two.
+ If Alignment is zero, then byte alignment is used.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateAlignedReservedPages (
+ IN UINTN Pages,
+ IN UINTN Alignment
+ )
+{
+ return NULL;
+}
+
+/**
+ Frees one or more 4KB pages that were previously allocated with one of the aligned page
+ allocation functions in the Memory Allocation Library.
+
+ Frees the number of 4KB pages specified by Pages from the buffer specified by Buffer. Buffer
+ must have been allocated on a previous call to the aligned page allocation services of the Memory
+ Allocation Library. If it is not possible to free allocated pages, then this function will
+ perform no actions.
+
+ If Buffer was not allocated with an aligned page allocation function in the Memory Allocation
+ Library, then ASSERT().
+ If Pages is zero, then ASSERT().
+
+ @param Buffer Pointer to the buffer of pages to free.
+ @param Pages The number of 4 KB pages to free.
+
+**/
+VOID
+EFIAPI
+FreeAlignedPages (
+ IN VOID *Buffer,
+ IN UINTN Pages
+ )
+{
+ EFI_STATUS Status;
+
+ ASSERT (Pages != 0);
+ Status = gSmst->SmmFreePages ((EFI_PHYSICAL_ADDRESS) (UINTN) Buffer, Pages);
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Allocates a buffer of a certain pool type.
+
+ Allocates the number bytes specified by AllocationSize of a certain pool type and returns a
+ pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
+ returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ @param MemoryType The type of memory to allocate.
+ @param AllocationSize The number of bytes to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+InternalAllocatePool (
+ IN EFI_MEMORY_TYPE MemoryType,
+ IN UINTN AllocationSize
+ )
+{
+ EFI_STATUS Status;
+ VOID *Memory;
+
+ Status = gSmst->SmmAllocatePool (MemoryType, AllocationSize, &Memory);
+ if (EFI_ERROR (Status)) {
+ Memory = NULL;
+ }
+ return Memory;
+}
+
+/**
+ Allocates a buffer of type EfiBootServicesData.
+
+ Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a
+ pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
+ returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ @param AllocationSize The number of bytes to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocatePool (
+ IN UINTN AllocationSize
+ )
+{
+ return InternalAllocatePool (EfiRuntimeServicesData, AllocationSize);
+}
+
+/**
+ Allocates a buffer of type EfiRuntimeServicesData.
+
+ Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData and returns
+ a pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
+ returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ @param AllocationSize The number of bytes to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateRuntimePool (
+ IN UINTN AllocationSize
+ )
+{
+ return InternalAllocatePool (EfiRuntimeServicesData, AllocationSize);
+}
+
+/**
+ Allocates a buffer of type EfiReservedMemoryType.
+
+ Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType and returns
+ a pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
+ returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ @param AllocationSize The number of bytes to allocate.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateReservedPool (
+ IN UINTN AllocationSize
+ )
+{
+ return NULL;
+}
+
+/**
+ Allocates and zeros a buffer of a certain pool type.
+
+ Allocates the number bytes specified by AllocationSize of a certain pool type, clears the buffer
+ with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a valid
+ buffer of 0 size is returned. If there is not enough memory remaining to satisfy the request,
+ then NULL is returned.
+
+ @param PoolType The type of memory to allocate.
+ @param AllocationSize The number of bytes to allocate and zero.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+InternalAllocateZeroPool (
+ IN EFI_MEMORY_TYPE PoolType,
+ IN UINTN AllocationSize
+ )
+{
+ VOID *Memory;
+
+ Memory = InternalAllocatePool (PoolType, AllocationSize);
+ if (Memory != NULL) {
+ Memory = ZeroMem (Memory, AllocationSize);
+ }
+ return Memory;
+}
+
+/**
+ Allocates and zeros a buffer of type EfiBootServicesData.
+
+ Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
+ buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
+ valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
+ request, then NULL is returned.
+
+ @param AllocationSize The number of bytes to allocate and zero.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateZeroPool (
+ IN UINTN AllocationSize
+ )
+{
+ return InternalAllocateZeroPool (EfiRuntimeServicesData, AllocationSize);
+}
+
+/**
+ Allocates and zeros a buffer of type EfiRuntimeServicesData.
+
+ Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, clears the
+ buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
+ valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
+ request, then NULL is returned.
+
+ @param AllocationSize The number of bytes to allocate and zero.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateRuntimeZeroPool (
+ IN UINTN AllocationSize
+ )
+{
+ return InternalAllocateZeroPool (EfiRuntimeServicesData, AllocationSize);
+}
+
+/**
+ Allocates and zeros a buffer of type EfiReservedMemoryType.
+
+ Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, clears the
+ buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
+ valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
+ request, then NULL is returned.
+
+ @param AllocationSize The number of bytes to allocate and zero.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateReservedZeroPool (
+ IN UINTN AllocationSize
+ )
+{
+ return NULL;
+}
+
+/**
+ Copies a buffer to an allocated buffer of a certain pool type.
+
+ Allocates the number bytes specified by AllocationSize of a certain pool type, copies
+ AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
+ allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
+ is not enough memory remaining to satisfy the request, then NULL is returned.
+ If Buffer is NULL, then ASSERT().
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
+
+ @param PoolType The type of pool to allocate.
+ @param AllocationSize The number of bytes to allocate and zero.
+ @param Buffer The buffer to copy to the allocated buffer.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+InternalAllocateCopyPool (
+ IN EFI_MEMORY_TYPE PoolType,
+ IN UINTN AllocationSize,
+ IN CONST VOID *Buffer
+ )
+{
+ VOID *Memory;
+
+ ASSERT (Buffer != NULL);
+ ASSERT (AllocationSize <= (MAX_ADDRESS - (UINTN) Buffer + 1));
+
+ Memory = InternalAllocatePool (PoolType, AllocationSize);
+ if (Memory != NULL) {
+ Memory = CopyMem (Memory, Buffer, AllocationSize);
+ }
+ return Memory;
+}
+
+/**
+ Copies a buffer to an allocated buffer of type EfiBootServicesData.
+
+ Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, copies
+ AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
+ allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
+ is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ If Buffer is NULL, then ASSERT().
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
+
+ @param AllocationSize The number of bytes to allocate and zero.
+ @param Buffer The buffer to copy to the allocated buffer.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateCopyPool (
+ IN UINTN AllocationSize,
+ IN CONST VOID *Buffer
+ )
+{
+ return InternalAllocateCopyPool (EfiRuntimeServicesData, AllocationSize, Buffer);
+}
+
+/**
+ Copies a buffer to an allocated buffer of type EfiRuntimeServicesData.
+
+ Allocates the number bytes specified by AllocationSize of type EfiRuntimeServicesData, copies
+ AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
+ allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
+ is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ If Buffer is NULL, then ASSERT().
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
+
+ @param AllocationSize The number of bytes to allocate and zero.
+ @param Buffer The buffer to copy to the allocated buffer.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateRuntimeCopyPool (
+ IN UINTN AllocationSize,
+ IN CONST VOID *Buffer
+ )
+{
+ return InternalAllocateCopyPool (EfiRuntimeServicesData, AllocationSize, Buffer);
+}
+
+/**
+ Copies a buffer to an allocated buffer of type EfiReservedMemoryType.
+
+ Allocates the number bytes specified by AllocationSize of type EfiReservedMemoryType, copies
+ AllocationSize bytes from Buffer to the newly allocated buffer, and returns a pointer to the
+ allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is returned. If there
+ is not enough memory remaining to satisfy the request, then NULL is returned.
+
+ If Buffer is NULL, then ASSERT().
+ If AllocationSize is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
+
+ @param AllocationSize The number of bytes to allocate and zero.
+ @param Buffer The buffer to copy to the allocated buffer.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateReservedCopyPool (
+ IN UINTN AllocationSize,
+ IN CONST VOID *Buffer
+ )
+{
+ return NULL;
+}
+
+/**
+ Reallocates a buffer of a specified memory type.
+
+ Allocates and zeros the number bytes specified by NewSize from memory of the type
+ specified by PoolType. If OldBuffer is not NULL, then the smaller of OldSize and
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
+ enough memory remaining to satisfy the request, then NULL is returned.
+
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
+
+ @param PoolType The type of pool to allocate.
+ @param OldSize The size, in bytes, of OldBuffer.
+ @param NewSize The size, in bytes, of the buffer to reallocate.
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
+ parameter that may be NULL.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+InternalReallocatePool (
+ IN EFI_MEMORY_TYPE PoolType,
+ IN UINTN OldSize,
+ IN UINTN NewSize,
+ IN VOID *OldBuffer OPTIONAL
+ )
+{
+ VOID *NewBuffer;
+
+ NewBuffer = InternalAllocateZeroPool (PoolType, NewSize);
+ if (NewBuffer != NULL && OldBuffer != NULL) {
+ CopyMem (NewBuffer, OldBuffer, MIN (OldSize, NewSize));
+ FreePool (OldBuffer);
+ }
+ return NewBuffer;
+}
+
+/**
+ Reallocates a buffer of type EfiBootServicesData.
+
+ Allocates and zeros the number bytes specified by NewSize from memory of type
+ EfiBootServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
+ enough memory remaining to satisfy the request, then NULL is returned.
+
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
+
+ @param OldSize The size, in bytes, of OldBuffer.
+ @param NewSize The size, in bytes, of the buffer to reallocate.
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
+ parameter that may be NULL.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+ReallocatePool (
+ IN UINTN OldSize,
+ IN UINTN NewSize,
+ IN VOID *OldBuffer OPTIONAL
+ )
+{
+ return InternalReallocatePool (EfiRuntimeServicesData, OldSize, NewSize, OldBuffer);
+}
+
+/**
+ Reallocates a buffer of type EfiRuntimeServicesData.
+
+ Allocates and zeros the number bytes specified by NewSize from memory of type
+ EfiRuntimeServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
+ enough memory remaining to satisfy the request, then NULL is returned.
+
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
+
+ @param OldSize The size, in bytes, of OldBuffer.
+ @param NewSize The size, in bytes, of the buffer to reallocate.
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
+ parameter that may be NULL.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+ReallocateRuntimePool (
+ IN UINTN OldSize,
+ IN UINTN NewSize,
+ IN VOID *OldBuffer OPTIONAL
+ )
+{
+ return InternalReallocatePool (EfiRuntimeServicesData, OldSize, NewSize, OldBuffer);
+}
+
+/**
+ Reallocates a buffer of type EfiReservedMemoryType.
+
+ Allocates and zeros the number bytes specified by NewSize from memory of type
+ EfiReservedMemoryType. If OldBuffer is not NULL, then the smaller of OldSize and
+ NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
+ OldBuffer is freed. A pointer to the newly allocated buffer is returned.
+ If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
+ enough memory remaining to satisfy the request, then NULL is returned.
+
+ If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
+ is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
+
+ @param OldSize The size, in bytes, of OldBuffer.
+ @param NewSize The size, in bytes, of the buffer to reallocate.
+ @param OldBuffer The buffer to copy to the allocated buffer. This is an optional
+ parameter that may be NULL.
+
+ @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+ReallocateReservedPool (
+ IN UINTN OldSize,
+ IN UINTN NewSize,
+ IN VOID *OldBuffer OPTIONAL
+ )
+{
+ return NULL;
+}
+
+/**
+ Frees a buffer that was previously allocated with one of the pool allocation functions in the
+ Memory Allocation Library.
+
+ Frees the buffer specified by Buffer. Buffer must have been allocated on a previous call to the
+ pool allocation services of the Memory Allocation Library. If it is not possible to free pool
+ resources, then this function will perform no actions.
+
+ If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,
+ then ASSERT().
+
+ @param Buffer Pointer to the buffer to free.
+
+**/
+VOID
+EFIAPI
+FreePool (
+ IN VOID *Buffer
+ )
+{
+ EFI_STATUS Status;
+
+ Status = gSmst->SmmFreePool (Buffer);
+ ASSERT_EFI_ERROR (Status);
+}
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