]>
git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/PeiMemoryLib/MemLibGeneric.c
2 Architecture Independent Base Memory Library Implementation.
4 The following BaseMemoryLib instances contain the same copy of this file:
9 Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
10 This program and the accompanying materials
11 are licensed and made available under the terms and conditions of the BSD License
12 which accompanies this distribution. The full text of the license may be found at
13 http://opensource.org/licenses/bsd-license.php.
15 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
16 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
20 #include "MemLibInternals.h"
23 Fills a target buffer with a 16-bit value, and returns the target buffer.
25 @param Buffer The pointer to the target buffer to fill.
26 @param Length The count of 16-bit value to fill.
27 @param Value The value with which to fill Length bytes of Buffer.
41 ((UINT16
*)Buffer
)[--Length
] = Value
;
42 } while (Length
!= 0);
47 Fills a target buffer with a 32-bit value, and returns the target buffer.
49 @param Buffer The pointer to the target buffer to fill.
50 @param Length The count of 32-bit value to fill.
51 @param Value The value with which to fill Length bytes of Buffer.
65 ((UINT32
*)Buffer
)[--Length
] = Value
;
66 } while (Length
!= 0);
71 Fills a target buffer with a 64-bit value, and returns the target buffer.
73 @param Buffer The pointer to the target buffer to fill.
74 @param Length The count of 64-bit value to fill.
75 @param Value The value with which to fill Length bytes of Buffer.
89 ((UINT64
*)Buffer
)[--Length
] = Value
;
90 } while (Length
!= 0);
95 Set Buffer to 0 for Size bytes.
97 @param Buffer The memory to set.
98 @param Length The number of bytes to set
110 return InternalMemSetMem (Buffer
, Length
, 0);
114 Compares two memory buffers of a given length.
116 @param DestinationBuffer The first memory buffer
117 @param SourceBuffer The second memory buffer
118 @param Length The length of DestinationBuffer and SourceBuffer memory
119 regions to compare. Must be non-zero.
121 @return 0 All Length bytes of the two buffers are identical.
122 @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first
123 mismatched byte in DestinationBuffer.
128 InternalMemCompareMem (
129 IN CONST VOID
*DestinationBuffer
,
130 IN CONST VOID
*SourceBuffer
,
134 while ((--Length
!= 0) &&
135 (*(INT8
*)DestinationBuffer
== *(INT8
*)SourceBuffer
)) {
136 DestinationBuffer
= (INT8
*)DestinationBuffer
+ 1;
137 SourceBuffer
= (INT8
*)SourceBuffer
+ 1;
139 return (INTN
)*(UINT8
*)DestinationBuffer
- (INTN
)*(UINT8
*)SourceBuffer
;
143 Scans a target buffer for an 8-bit value, and returns a pointer to the
144 matching 8-bit value in the target buffer.
146 @param Buffer The pointer to the target buffer to scan.
147 @param Length The count of 8-bit value to scan. Must be non-zero.
148 @param Value The value to search for in the target buffer.
150 @return The pointer to the first occurrence, or NULL if not found.
155 InternalMemScanMem8 (
156 IN CONST VOID
*Buffer
,
161 CONST UINT8
*Pointer
;
163 Pointer
= (CONST UINT8
*)Buffer
;
165 if (*(Pointer
++) == Value
) {
168 } while (--Length
!= 0);
173 Scans a target buffer for a 16-bit value, and returns a pointer to the
174 matching 16-bit value in the target buffer.
176 @param Buffer The pointer to the target buffer to scan.
177 @param Length The count of 16-bit value to scan. Must be non-zero.
178 @param Value The value to search for in the target buffer.
180 @return The pointer to the first occurrence, or NULL if not found.
185 InternalMemScanMem16 (
186 IN CONST VOID
*Buffer
,
191 CONST UINT16
*Pointer
;
193 Pointer
= (CONST UINT16
*)Buffer
;
195 if (*(Pointer
++) == Value
) {
198 } while (--Length
!= 0);
203 Scans a target buffer for a 32-bit value, and returns a pointer to the
204 matching 32-bit value in the target buffer.
206 @param Buffer The pointer to the target buffer to scan.
207 @param Length The count of 32-bit value to scan. Must be non-zero.
208 @param Value The value to search for in the target buffer.
210 @return The pointer to the first occurrence, or NULL if not found.
215 InternalMemScanMem32 (
216 IN CONST VOID
*Buffer
,
221 CONST UINT32
*Pointer
;
223 Pointer
= (CONST UINT32
*)Buffer
;
225 if (*(Pointer
++) == Value
) {
228 } while (--Length
!= 0);
233 Scans a target buffer for a 64-bit value, and returns a pointer to the
234 matching 64-bit value in the target buffer.
236 @param Buffer The pointer to the target buffer to scan.
237 @param Length The count of 64-bit value to scan. Must be non-zero.
238 @param Value The value to search for in the target buffer.
240 @return The pointer to the first occurrence, or NULL if not found.
245 InternalMemScanMem64 (
246 IN CONST VOID
*Buffer
,
251 CONST UINT64
*Pointer
;
253 Pointer
= (CONST UINT64
*)Buffer
;
255 if (*(Pointer
++) == Value
) {
258 } while (--Length
!= 0);