1 /** @file
2 ScanMem64() implementation.
3
4 The following BaseMemoryLib instances contain the same copy of this file:
5
6 BaseMemoryLib
7 BaseMemoryLibMmx
8 BaseMemoryLibSse2
9 BaseMemoryLibRepStr
10 BaseMemoryLibOptDxe
11 BaseMemoryLibOptPei
12 PeiMemoryLib
13 UefiMemoryLib
14
15 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
16 SPDX-License-Identifier: BSD-2-Clause-Patent
17
18 **/
19
20 #include "MemLibInternals.h"
21
22 /**
23 Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value
24 in the target buffer.
25
26 This function searches the target buffer specified by Buffer and Length from the lowest
27 address to the highest address for a 64-bit value that matches Value. If a match is found,
28 then a pointer to the matching byte in the target buffer is returned. If no match is found,
29 then NULL is returned. If Length is 0, then NULL is returned.
30
31 If Length > 0 and Buffer is NULL, then ASSERT().
32 If Buffer is not aligned on a 64-bit boundary, then ASSERT().
33 If Length is not aligned on a 64-bit boundary, then ASSERT().
34 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
35
36 @param Buffer The pointer to the target buffer to scan.
37 @param Length The number of bytes in Buffer to scan.
38 @param Value The value to search for in the target buffer.
39
40 @return A pointer to the matching byte in the target buffer or NULL otherwise.
41
42 **/
43 VOID *
44 EFIAPI
ScanMem64(IN CONST VOID * Buffer,IN UINTN Length,IN UINT64 Value)45 ScanMem64 (
46 IN CONST VOID *Buffer,
47 IN UINTN Length,
48 IN UINT64 Value
49 )
50 {
51 if (Length == 0) {
52 return NULL;
53 }
54
55 ASSERT (Buffer != NULL);
56 ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);
57 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
58 ASSERT ((Length & (sizeof (Value) - 1)) == 0);
59
60 return (VOID*)InternalMemScanMem64 (Buffer, Length / sizeof (Value), Value);
61 }
62