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7b3b4b29 1/** @file\r
2 ScanMem64() implementation.\r
3\r
2bfb6009 4 The following BaseMemoryLib instances contain the same copy of this file:\r
7b3b4b29 5\r
6 BaseMemoryLib\r
7 BaseMemoryLibMmx\r
8 BaseMemoryLibSse2\r
9 BaseMemoryLibRepStr\r
2bfb6009
LG
10 BaseMemoryLibOptDxe\r
11 BaseMemoryLibOptPei\r
7b3b4b29 12 PeiMemoryLib\r
1fef058f 13 UefiMemoryLib\r
7b3b4b29 14\r
9095d37b 15 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
9344f092 16 SPDX-License-Identifier: BSD-2-Clause-Patent\r
7b3b4b29 17\r
eb1c78db 18**/\r
7b3b4b29 19\r
20#include "MemLibInternals.h"\r
21\r
22/**\r
23 Scans a target buffer for a 64-bit value, and returns a pointer to the matching 64-bit value\r
24 in the target buffer.\r
25\r
56385d49 26 This function searches the target buffer specified by Buffer and Length from the lowest\r
7b3b4b29 27 address to the highest address for a 64-bit value that matches Value. If a match is found,\r
28 then a pointer to the matching byte in the target buffer is returned. If no match is found,\r
29 then NULL is returned. If Length is 0, then NULL is returned.\r
9095d37b 30\r
7b3b4b29 31 If Length > 0 and Buffer is NULL, then ASSERT().\r
32 If Buffer is not aligned on a 64-bit boundary, then ASSERT().\r
33 If Length is not aligned on a 64-bit boundary, then ASSERT().\r
eb1c78db 34 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
7b3b4b29 35\r
2fc59a00 36 @param Buffer The pointer to the target buffer to scan.\r
37 @param Length The number of bytes in Buffer to scan.\r
38 @param Value The value to search for in the target buffer.\r
7b3b4b29 39\r
40 @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
41\r
42**/\r
43VOID *\r
44EFIAPI\r
45ScanMem64 (\r
46 IN CONST VOID *Buffer,\r
47 IN UINTN Length,\r
48 IN UINT64 Value\r
49 )\r
50{\r
2bfb6009 51 if (Length == 0) {\r
7b3b4b29 52 return NULL;\r
53 }\r
54\r
55 ASSERT (Buffer != NULL);\r
56 ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);\r
57 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
58 ASSERT ((Length & (sizeof (Value) - 1)) == 0);\r
59\r
2f88bd3a 60 return (VOID *)InternalMemScanMem64 (Buffer, Length / sizeof (Value), Value);\r
7b3b4b29 61}\r