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git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/PeiMemoryLib/MemLibGeneric.c
2 Architecture Independent Base Memory Library Implementation.
4 Copyright (c) 2006, Intel Corporation<BR>
5 All rights reserved. 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
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.
13 The following BaseMemoryLib instances share the same version of this file:
21 #include "MemLibInternals.h"
24 Fills a target buffer with a 16-bit value, and returns the target buffer.
26 @param Buffer Pointer to the target buffer to fill.
27 @param Length Number of bytes in Buffer to fill.
28 @param Value Value with which to fill Length bytes of Buffer.
42 ((UINT16
*)Buffer
)[--Length
] = Value
;
43 } while (Length
!= 0);
48 Fills a target buffer with a 32-bit value, and returns the target buffer.
50 @param Buffer Pointer to the target buffer to fill.
51 @param Length Number of bytes in Buffer to fill.
52 @param Value Value with which to fill Length bytes of Buffer.
66 ((UINT32
*)Buffer
)[--Length
] = Value
;
67 } while (Length
!= 0);
72 Fills a target buffer with a 64-bit value, and returns the target buffer.
74 @param Buffer Pointer to the target buffer to fill.
75 @param Length Number of bytes in Buffer to fill.
76 @param Value Value with which to fill Length bytes of Buffer.
90 ((UINT64
*)Buffer
)[--Length
] = Value
;
91 } while (Length
!= 0);
96 Set Buffer to 0 for Size bytes.
98 @param Buffer Memory to set.
99 @param Size Number of bytes to set
111 return InternalMemSetMem (Buffer
, Length
, 0);
115 Compares two memory buffers of a given length.
117 @param DestinationBuffer First memory buffer
118 @param SourceBuffer Second memory buffer
119 @param Length Length of DestinationBuffer and SourceBuffer memory
120 regions to compare. Must be non-zero.
122 @retval 0 if MemOne == MemTwo
127 InternalMemCompareMem (
128 IN CONST VOID
*DestinationBuffer
,
129 IN CONST VOID
*SourceBuffer
,
133 while ((--Length
!= 0) &&
134 (*(INT8
*)DestinationBuffer
== *(INT8
*)SourceBuffer
)) {
135 DestinationBuffer
= (INT8
*)DestinationBuffer
+ 1;
136 SourceBuffer
= (INT8
*)SourceBuffer
+ 1;
138 return (INTN
)*(UINT8
*)DestinationBuffer
- (INTN
)*(UINT8
*)SourceBuffer
;
142 Scans a target buffer for an 8-bit value, and returns a pointer to the
143 matching 8-bit value in the target buffer.
145 @param Buffer Pointer to the target buffer to scan.
146 @param Length Number of bytes in Buffer to scan. Must be non-zero.
147 @param Value Value to search for in the target buffer.
149 @return Pointer to the first occurrence or NULL if not found.
154 InternalMemScanMem8 (
155 IN CONST VOID
*Buffer
,
160 CONST UINT8
*Pointer
;
162 Pointer
= (CONST UINT8
*)Buffer
;
164 if (*(Pointer
++) == Value
) {
167 } while (--Length
!= 0);
172 Scans a target buffer for a 16-bit value, and returns a pointer to the
173 matching 16-bit value in the target buffer.
175 @param Buffer Pointer to the target buffer to scan.
176 @param Length Number of bytes in Buffer to scan. Must be non-zero.
177 @param Value Value to search for in the target buffer.
179 @return Pointer to the first occurrence or NULL if not found.
184 InternalMemScanMem16 (
185 IN CONST VOID
*Buffer
,
190 CONST UINT16
*Pointer
;
192 Pointer
= (CONST UINT16
*)Buffer
;
194 if (*(Pointer
++) == Value
) {
197 } while (--Length
!= 0);
202 Scans a target buffer for a 32-bit value, and returns a pointer to the
203 matching 32-bit value in the target buffer.
205 @param Buffer Pointer to the target buffer to scan.
206 @param Length Number of bytes in Buffer to scan. Must be non-zero.
207 @param Value Value to search for in the target buffer.
209 @return Pointer to the first occurrence or NULL if not found.
214 InternalMemScanMem32 (
215 IN CONST VOID
*Buffer
,
220 CONST UINT32
*Pointer
;
222 Pointer
= (CONST UINT32
*)Buffer
;
224 if (*(Pointer
++) == Value
) {
227 } while (--Length
!= 0);
232 Scans a target buffer for a 64-bit value, and returns a pointer to the
233 matching 64-bit value in the target buffer.
235 @param Buffer Pointer to the target buffer to scan.
236 @param Length Number of bytes in Buffer to scan. Must be non-zero.
237 @param Value Value to search for in the target buffer.
239 @return Pointer to the first occurrence or NULL if not found.
244 InternalMemScanMem64 (
245 IN CONST VOID
*Buffer
,
250 CONST UINT64
*Pointer
;
252 Pointer
= (CONST UINT64
*)Buffer
;
254 if (*(Pointer
++) == Value
) {
257 } while (--Length
!= 0);