TianoCore EDK2 master
MemoryAllocationLib.c File Reference
#include <Uefi.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/EmuThunkLib.h>

Go to the source code of this file.

Functions

VOIDInternalAllocatePages (IN EFI_MEMORY_TYPE MemoryType, IN UINTN Pages)
 
VOID *EFIAPI AllocatePages (IN UINTN Pages)
 
VOID *EFIAPI AllocateRuntimePages (IN UINTN Pages)
 
VOID *EFIAPI AllocateReservedPages (IN UINTN Pages)
 
VOID EFIAPI FreePages (IN VOID *Buffer, IN UINTN Pages)
 
VOIDInternalAllocateAlignedPages (IN EFI_MEMORY_TYPE MemoryType, IN UINTN Pages, IN UINTN Alignment)
 
VOID *EFIAPI AllocateAlignedPages (IN UINTN Pages, IN UINTN Alignment)
 
VOID *EFIAPI AllocateAlignedRuntimePages (IN UINTN Pages, IN UINTN Alignment)
 
VOID *EFIAPI AllocateAlignedReservedPages (IN UINTN Pages, IN UINTN Alignment)
 
VOID EFIAPI FreeAlignedPages (IN VOID *Buffer, IN UINTN Pages)
 
VOIDInternalAllocatePool (IN EFI_MEMORY_TYPE MemoryType, IN UINTN AllocationSize)
 
VOID *EFIAPI AllocatePool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateRuntimePool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateReservedPool (IN UINTN AllocationSize)
 
VOIDInternalAllocateZeroPool (IN EFI_MEMORY_TYPE PoolType, IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateZeroPool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateRuntimeZeroPool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateReservedZeroPool (IN UINTN AllocationSize)
 
VOIDInternalAllocateCopyPool (IN EFI_MEMORY_TYPE PoolType, IN UINTN AllocationSize, IN CONST VOID *Buffer)
 
VOID *EFIAPI AllocateCopyPool (IN UINTN AllocationSize, IN CONST VOID *Buffer)
 
VOID *EFIAPI AllocateRuntimeCopyPool (IN UINTN AllocationSize, IN CONST VOID *Buffer)
 
VOID *EFIAPI AllocateReservedCopyPool (IN UINTN AllocationSize, IN CONST VOID *Buffer)
 
VOIDInternalReallocatePool (IN EFI_MEMORY_TYPE PoolType, IN UINTN OldSize, IN UINTN NewSize, IN VOID *OldBuffer OPTIONAL)
 
VOID *EFIAPI ReallocatePool (IN UINTN OldSize, IN UINTN NewSize, IN VOID *OldBuffer OPTIONAL)
 
VOID *EFIAPI ReallocateRuntimePool (IN UINTN OldSize, IN UINTN NewSize, IN VOID *OldBuffer OPTIONAL)
 
VOID *EFIAPI ReallocateReservedPool (IN UINTN OldSize, IN UINTN NewSize, IN VOID *OldBuffer OPTIONAL)
 
VOID EFIAPI FreePool (IN VOID *Buffer)
 

Detailed Description

Support routines for memory allocation routines based on boot services for Dxe phase drivers using OS malloc.

OS malloc is used so OS based malloc debugging tools can be used. If a single driver links against this lib protocols from other drivers, or EFI boot services can return a buffer that needs to freed using the EFI scheme. This is why the gEmuThunk->Free () can detect if the memory rang is for EFI so the right free can be called.

Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.
Portions copyright (c) 2011, Apple Inc. All rights reserved. SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file MemoryAllocationLib.c.

Function Documentation

◆ AllocateAlignedPages()

VOID *EFIAPI AllocateAlignedPages ( IN UINTN  Pages,
IN UINTN  Alignment 
)

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().

Parameters
PagesThe number of 4 KB pages to allocate.
AlignmentThe requested alignment of the allocation. Must be a power of two. If Alignment is zero, then byte alignment is used.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 264 of file MemoryAllocationLib.c.

◆ AllocateAlignedReservedPages()

VOID *EFIAPI AllocateAlignedReservedPages ( IN UINTN  Pages,
IN UINTN  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().

Parameters
PagesThe number of 4 KB pages to allocate.
AlignmentThe requested alignment of the allocation. Must be a power of two. If Alignment is zero, then byte alignment is used.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 318 of file MemoryAllocationLib.c.

◆ AllocateAlignedRuntimePages()

VOID *EFIAPI AllocateAlignedRuntimePages ( IN UINTN  Pages,
IN UINTN  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().

Parameters
PagesThe number of 4 KB pages to allocate.
AlignmentThe requested alignment of the allocation. Must be a power of two. If Alignment is zero, then byte alignment is used.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 291 of file MemoryAllocationLib.c.

◆ AllocateCopyPool()

VOID *EFIAPI AllocateCopyPool ( IN UINTN  AllocationSize,
IN CONST VOID Buffer 
)

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().

Parameters
AllocationSizeThe number of bytes to allocate and zero.
BufferThe buffer to copy to the allocated buffer.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 590 of file MemoryAllocationLib.c.

◆ AllocatePages()

VOID *EFIAPI AllocatePages ( IN UINTN  Pages)

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.

Parameters
PagesThe number of 4 KB pages to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 70 of file MemoryAllocationLib.c.

◆ AllocatePool()

VOID *EFIAPI AllocatePool ( IN UINTN  AllocationSize)

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.

Parameters
AllocationSizeThe number of bytes to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 389 of file MemoryAllocationLib.c.

◆ AllocateReservedCopyPool()

VOID *EFIAPI AllocateReservedCopyPool ( IN UINTN  AllocationSize,
IN CONST VOID 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().

Parameters
AllocationSizeThe number of bytes to allocate and zero.
BufferThe buffer to copy to the allocated buffer.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 644 of file MemoryAllocationLib.c.

◆ AllocateReservedPages()

VOID *EFIAPI AllocateReservedPages ( IN UINTN  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.

Parameters
PagesThe number of 4 KB pages to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 114 of file MemoryAllocationLib.c.

◆ AllocateReservedPool()

VOID *EFIAPI AllocateReservedPool ( IN UINTN  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.

Parameters
AllocationSizeThe number of bytes to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 431 of file MemoryAllocationLib.c.

◆ AllocateReservedZeroPool()

VOID *EFIAPI AllocateReservedZeroPool ( IN UINTN  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.

Parameters
AllocationSizeThe number of bytes to allocate and zero.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 527 of file MemoryAllocationLib.c.

◆ AllocateRuntimeCopyPool()

VOID *EFIAPI AllocateRuntimeCopyPool ( IN UINTN  AllocationSize,
IN CONST VOID 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().

Parameters
AllocationSizeThe number of bytes to allocate and zero.
BufferThe buffer to copy to the allocated buffer.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 617 of file MemoryAllocationLib.c.

◆ AllocateRuntimePages()

VOID *EFIAPI AllocateRuntimePages ( IN UINTN  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.

Parameters
PagesThe number of 4 KB pages to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 92 of file MemoryAllocationLib.c.

◆ AllocateRuntimePool()

VOID *EFIAPI AllocateRuntimePool ( IN UINTN  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.

Parameters
AllocationSizeThe number of bytes to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 410 of file MemoryAllocationLib.c.

◆ AllocateRuntimeZeroPool()

VOID *EFIAPI AllocateRuntimeZeroPool ( IN UINTN  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.

Parameters
AllocationSizeThe number of bytes to allocate and zero.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 505 of file MemoryAllocationLib.c.

◆ AllocateZeroPool()

VOID *EFIAPI AllocateZeroPool ( IN UINTN  AllocationSize)

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.

Parameters
AllocationSizeThe number of bytes to allocate and zero.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 483 of file MemoryAllocationLib.c.

◆ FreeAlignedPages()

VOID EFIAPI FreeAlignedPages ( IN VOID Buffer,
IN UINTN  Pages 
)

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().

Parameters
BufferThe pointer to the buffer of pages to free.
PagesThe number of 4 KB pages to free.

Definition at line 345 of file MemoryAllocationLib.c.

◆ FreePages()

VOID EFIAPI FreePages ( IN VOID Buffer,
IN UINTN  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().

Parameters
BufferThe pointer to the buffer of pages to free.
PagesThe number of 4 KB pages to free.

Definition at line 140 of file MemoryAllocationLib.c.

◆ FreePool()

VOID EFIAPI FreePool ( IN VOID Buffer)

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().

Parameters
BufferThe pointer to the buffer to free.

Definition at line 805 of file MemoryAllocationLib.c.

◆ InternalAllocateAlignedPages()

VOID * InternalAllocateAlignedPages ( IN EFI_MEMORY_TYPE  MemoryType,
IN UINTN  Pages,
IN UINTN  Alignment 
)

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().

Parameters
MemoryTypeThe type of memory to allocate.
PagesThe number of 4 KB pages to allocate.
AlignmentThe requested alignment of the allocation. Must be a power of two. If Alignment is zero, then byte alignment is used.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 175 of file MemoryAllocationLib.c.

◆ InternalAllocateCopyPool()

VOID * InternalAllocateCopyPool ( IN EFI_MEMORY_TYPE  PoolType,
IN UINTN  AllocationSize,
IN CONST VOID Buffer 
)

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().

Parameters
PoolTypeThe type of pool to allocate.
AllocationSizeThe number of bytes to allocate and zero.
BufferThe buffer to copy to the allocated buffer.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 552 of file MemoryAllocationLib.c.

◆ InternalAllocatePages()

VOID * InternalAllocatePages ( IN EFI_MEMORY_TYPE  MemoryType,
IN UINTN  Pages 
)

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.

Parameters
MemoryTypeThe type of memory to allocate.
PagesThe number of 4 KB pages to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 40 of file MemoryAllocationLib.c.

◆ InternalAllocatePool()

VOID * InternalAllocatePool ( IN EFI_MEMORY_TYPE  MemoryType,
IN UINTN  AllocationSize 
)

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.

Parameters
MemoryTypeThe type of memory to allocate.
AllocationSizeThe number of bytes to allocate.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 367 of file MemoryAllocationLib.c.

◆ InternalAllocateZeroPool()

VOID * InternalAllocateZeroPool ( IN EFI_MEMORY_TYPE  PoolType,
IN UINTN  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.

Parameters
PoolTypeThe type of memory to allocate.
AllocationSizeThe number of bytes to allocate and zero.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 453 of file MemoryAllocationLib.c.

◆ InternalReallocatePool()

VOID * InternalReallocatePool ( IN EFI_MEMORY_TYPE  PoolType,
IN UINTN  OldSize,
IN UINTN  NewSize,
IN VOID *OldBuffer  OPTIONAL 
)

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().

Parameters
PoolTypeThe type of pool to allocate.
OldSizeThe size, in bytes, of OldBuffer.
NewSizeThe size, in bytes, of the buffer to reallocate.
OldBufferThe buffer to copy to the allocated buffer. This is an optional parameter that may be NULL.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 675 of file MemoryAllocationLib.c.

◆ ReallocatePool()

VOID *EFIAPI ReallocatePool ( IN UINTN  OldSize,
IN UINTN  NewSize,
IN VOID *OldBuffer  OPTIONAL 
)

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().

Parameters
OldSizeThe size, in bytes, of OldBuffer.
NewSizeThe size, in bytes, of the buffer to reallocate.
OldBufferThe buffer to copy to the allocated buffer. This is an optional parameter that may be NULL.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 716 of file MemoryAllocationLib.c.

◆ ReallocateReservedPool()

VOID *EFIAPI ReallocateReservedPool ( IN UINTN  OldSize,
IN UINTN  NewSize,
IN VOID *OldBuffer  OPTIONAL 
)

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().

Parameters
OldSizeThe size, in bytes, of OldBuffer.
NewSizeThe size, in bytes, of the buffer to reallocate.
OldBufferThe buffer to copy to the allocated buffer. This is an optional parameter that may be NULL.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 780 of file MemoryAllocationLib.c.

◆ ReallocateRuntimePool()

VOID *EFIAPI ReallocateRuntimePool ( IN UINTN  OldSize,
IN UINTN  NewSize,
IN VOID *OldBuffer  OPTIONAL 
)

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().

Parameters
OldSizeThe size, in bytes, of OldBuffer.
NewSizeThe size, in bytes, of the buffer to reallocate.
OldBufferThe buffer to copy to the allocated buffer. This is an optional parameter that may be NULL.
Returns
A pointer to the allocated buffer or NULL if allocation fails.

Definition at line 748 of file MemoryAllocationLib.c.