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MemoryAllocationLib.h File Reference

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Functions

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)
 
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)
 
VOID *EFIAPI AllocatePool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateRuntimePool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateReservedPool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateZeroPool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateRuntimeZeroPool (IN UINTN AllocationSize)
 
VOID *EFIAPI AllocateReservedZeroPool (IN UINTN AllocationSize)
 
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)
 
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

Provides services to allocate and free memory buffers of various memory types and alignments.

The Memory Allocation Library abstracts various common memory allocation operations. This library allows code to be written in a phase-independent manner because the allocation of memory in PEI, DXE, and SMM (for example) is done via a different mechanism. Using a common library interface makes it much easier to port algorithms from phase to phase.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file MemoryAllocationLib.h.

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(). If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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.

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.

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().

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.

Allocates one or more pages of type EfiBootServicesData at a specified alignment.

Allocates the number of pages specified by Pages of type EfiBootServicesData with an alignment specified by Alignment. If Pages is 0, then NULL is returned. If Alignment is not a power of two and Alignment is not zero, then ASSERT(). If there is no enough memory at the specified alignment available to satisfy the request, then NULL is returned.

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

Definition at line 92 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(). If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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.

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(). If Pages plus EFI_SIZE_TO_PAGES (Alignment) overflows, 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.

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.

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 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.

Allocates one or more 4KB pages of type EfiBootServicesData.

Allocates the number of 4KB pages of MemoryType 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.

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.

Allocates one or more pages of type EfiBootServicesData.

Allocates the number of pages of MemoryType 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 availble 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 32 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.

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 168 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.

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 207 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
BufferPointer to the buffer of pages to free.
PagesThe number of 4 KB pages to free.

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
BufferPointer to the buffer of pages to free.
PagesThe number of 4 KB pages to free.

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 145 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
BufferPointer to the buffer to free.

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 239 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.

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 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.