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audk/MdePkg/Library/UefiMemoryAllocationLib/MemoryAllocationLib.c

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/** @file
Support routines for memory allocation routines based
on boot services for Dxe phase drivers.
Copyright (c) 2006 - 2017, 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 <Uefi.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.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 = gBS->AllocatePages (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 (EfiBootServicesData, 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 InternalAllocatePages (EfiReservedMemoryType, Pages);
}
/**
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 The 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 = gBS->FreePages ((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().
If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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) {
//
// Calculate 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 = gBS->AllocatePages (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 = gBS->FreePages (Memory, UnalignedPages);
ASSERT_EFI_ERROR (Status);
}
Memory = AlignedMemory + EFI_PAGES_TO_SIZE (Pages);
UnalignedPages = RealPages - Pages - UnalignedPages;
if (UnalignedPages > 0) {
//
// Free last unaligned page(s).
//
Status = gBS->FreePages (Memory, UnalignedPages);
ASSERT_EFI_ERROR (Status);
}
} else {
//
// Do not over-allocate pages in this case.
//
Status = gBS->AllocatePages (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().
If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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 (EfiBootServicesData, 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().
If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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().
If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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 InternalAllocateAlignedPages (EfiReservedMemoryType, Pages, Alignment);
}
/**
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 The 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 = gBS->FreePages ((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 = gBS->AllocatePool (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 (EfiBootServicesData, 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 InternalAllocatePool (EfiReservedMemoryType, AllocationSize);
}
/**
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 (EfiBootServicesData, 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 InternalAllocateZeroPool (EfiReservedMemoryType, AllocationSize);
}
/**
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 (EfiBootServicesData, 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 InternalAllocateCopyPool (EfiReservedMemoryType, AllocationSize, Buffer);
}
/**
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 (EfiBootServicesData, 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 InternalReallocatePool (EfiReservedMemoryType, OldSize, NewSize, OldBuffer);
}
/**
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 The pointer to the buffer to free.
**/
VOID
EFIAPI
FreePool (
IN VOID *Buffer
)
{
EFI_STATUS Status;
Status = gBS->FreePool (Buffer);
ASSERT_EFI_ERROR (Status);
}
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