mirror of https://github.com/acidanthera/audk.git
136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*++ @file
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Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "Base.h"
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#include "Library/BaseMemoryLib.h"
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#include "Library/MemoryAllocationLib.h"
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#include <stdlib.h>
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/**
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Allocates a buffer of type EfiBootServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a
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pointer to the allocated buffer. If AllocationSize is 0, then a valid buffer of 0 size is
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returned. If there is not enough memory remaining to satisfy the request, then NULL is returned.
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@param AllocationSize The number of bytes to allocate.
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@return A pointer to the allocated buffer or NULL if allocation fails.
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**/
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VOID *
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EFIAPI
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AllocatePool (
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IN UINTN AllocationSize
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)
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{
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return (VOID *)malloc (AllocationSize);
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}
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/**
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Allocates and zeros a buffer of type EfiBootServicesData.
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Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
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buffer with zeros, and returns a pointer to the allocated buffer. If AllocationSize is 0, then a
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valid buffer of 0 size is returned. If there is not enough memory remaining to satisfy the
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request, then NULL is returned.
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@param AllocationSize The number of bytes to allocate and zero.
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@return A pointer to the allocated buffer or NULL if allocation fails.
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**/
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VOID *
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EFIAPI
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AllocateZeroPool (
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IN UINTN AllocationSize
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)
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{
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VOID *Buffer;
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Buffer = AllocatePool (AllocationSize);
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if (Buffer == NULL) {
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return NULL;
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}
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ZeroMem (Buffer, AllocationSize);
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return Buffer;
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}
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/**
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Reallocates a buffer of type EfiBootServicesData.
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Allocates and zeros the number bytes specified by NewSize from memory of type
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EfiBootServicesData. If OldBuffer is not NULL, then the smaller of OldSize and
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NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
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OldBuffer is freed. A pointer to the newly allocated buffer is returned.
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If NewSize is 0, then a valid buffer of 0 size is returned. If there is not
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enough memory remaining to satisfy the request, then NULL is returned.
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If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
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is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
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@param OldSize The size, in bytes, of OldBuffer.
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@param NewSize The size, in bytes, of the buffer to reallocate.
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@param OldBuffer The buffer to copy to the allocated buffer. This is an optional
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parameter that may be NULL.
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@return A pointer to the allocated buffer or NULL if allocation fails.
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**/
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VOID *
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EFIAPI
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ReallocatePool (
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IN UINTN OldSize,
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IN UINTN NewSize,
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IN VOID *OldBuffer OPTIONAL
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)
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{
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VOID *NewBuffer;
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NewBuffer = AllocatePool (NewSize);
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if (NewBuffer == NULL) {
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return NULL;
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}
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if (OldBuffer != NULL) {
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if (OldSize > 0) {
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CopyMem (NewBuffer, OldBuffer, OldSize);
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}
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FreePool (OldBuffer);
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}
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return NewBuffer;
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}
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/**
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Frees a buffer that was previously allocated with one of the pool allocation functions in the
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Memory Allocation Library.
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Frees the buffer specified by Buffer. Buffer must have been allocated on a previous call to the
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pool allocation services of the Memory Allocation Library. If it is not possible to free pool
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resources, then this function will perform no actions.
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If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,
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then ASSERT().
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@param Buffer Pointer to the buffer to free.
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**/
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VOID
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EFIAPI
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FreePool (
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IN VOID *Buffer
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)
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{
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free ((void *)Buffer);
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}
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