EmulatorPkg/Unix/Host/MemoryAllocationLib.c

   1 /*++ @file
   2
   3   Copyright (c) 2011, Intel Corporation. All rights reserved.<BR>
   4
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "Base.h"
  16 #include "Library/BaseMemoryLib.h"
  17 #include "Library/MemoryAllocationLib.h"
  18
  19 #include <stdlib.h>
  20
  21 /**
  22   Allocates a buffer of type EfiBootServicesData.
  23
  24   Allocates the number bytes specified by AllocationSize of type EfiBootServicesData and returns a
  25   pointer to the allocated buffer.  If AllocationSize is 0, then a valid buffer of 0 size is
  26   returned.  If there is not enough memory remaining to satisfy the request, then NULL is returned.
  27
  28   @param  AllocationSize        The number of bytes to allocate.
  29
  30   @return A pointer to the allocated buffer or NULL if allocation fails.
  31
  32 **/
  33 VOID *
  34 EFIAPI
  35 AllocatePool (
  36   IN UINTN  AllocationSize
  37   )
  38 {
  39   return (VOID*) malloc (AllocationSize);
  40 }
  41
  42
  43 /**
  44   Allocates and zeros a buffer of type EfiBootServicesData.
  45
  46   Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
  47   buffer with zeros, and returns a pointer to the allocated buffer.  If AllocationSize is 0, then a
  48   valid buffer of 0 size is returned.  If there is not enough memory remaining to satisfy the
  49   request, then NULL is returned.
  50
  51   @param  AllocationSize        The number of bytes to allocate and zero.
  52
  53   @return A pointer to the allocated buffer or NULL if allocation fails.
  54
  55 **/
  56 VOID *
  57 EFIAPI
  58 AllocateZeroPool (
  59   IN UINTN  AllocationSize
  60   )
  61 {
  62   VOID *Buffer;
  63
  64   Buffer = AllocatePool (AllocationSize);
  65   if (Buffer == NULL) {
  66     return NULL;
  67   }
  68
  69   ZeroMem (Buffer, AllocationSize);
  70
  71   return Buffer;
  72 }
  73
  74
  75 /**
  76   Reallocates a buffer of type EfiBootServicesData.
  77
  78   Allocates and zeros the number bytes specified by NewSize from memory of type
  79   EfiBootServicesData.  If OldBuffer is not NULL, then the smaller of OldSize and
  80   NewSize bytes are copied from OldBuffer to the newly allocated buffer, and
  81   OldBuffer is freed.  A pointer to the newly allocated buffer is returned.
  82   If NewSize is 0, then a valid buffer of 0 size is  returned.  If there is not
  83   enough memory remaining to satisfy the request, then NULL is returned.
  84
  85   If the allocation of the new buffer is successful and the smaller of NewSize and OldSize
  86   is greater than (MAX_ADDRESS - OldBuffer + 1), then ASSERT().
  87
  88   @param  OldSize        The size, in bytes, of OldBuffer.
  89   @param  NewSize        The size, in bytes, of the buffer to reallocate.
  90   @param  OldBuffer      The buffer to copy to the allocated buffer.  This is an optional
  91                          parameter that may be NULL.
  92
  93   @return A pointer to the allocated buffer or NULL if allocation fails.
  94
  95 **/
  96 VOID *
  97 EFIAPI
  98 ReallocatePool (
  99   IN UINTN  OldSize,
 100   IN UINTN  NewSize,
 101   IN VOID   *OldBuffer  OPTIONAL
 102   )
 103 {
 104   VOID *NewBuffer;
 105
 106   NewBuffer = AllocatePool (NewSize);
 107   if (NewBuffer == NULL) {
 108     return NULL;
 109   }
 110
 111   if (OldBuffer != NULL) {
 112     if (OldSize > 0) {
 113       CopyMem (NewBuffer, OldBuffer, OldSize);
 114     }
 115
 116     FreePool (OldBuffer);
 117   }
 118
 119   return NewBuffer;
 120 }
 121
 122
 123 /**
 124   Frees a buffer that was previously allocated with one of the pool allocation functions in the
 125   Memory Allocation Library.
 126
 127   Frees the buffer specified by Buffer.  Buffer must have been allocated on a previous call to the
 128   pool allocation services of the Memory Allocation Library.  If it is not possible to free pool
 129   resources, then this function will perform no actions.
 130
 131   If Buffer was not allocated with a pool allocation function in the Memory Allocation Library,
 132   then ASSERT().
 133
 134   @param  Buffer                Pointer to the buffer to free.
 135
 136 **/
 137 VOID
 138 EFIAPI
 139 FreePool (
 140   IN VOID   *Buffer
 141   )
 142 {
 143   free ((void *) Buffer);
 144 }
 145