]>
git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/BaseLib/Ipf/Unaligned.c
2 Unaligned access functions of BaseLib for IPF.
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 Module Name: Unaligned.c
18 Reads a 16-bit value from memory that may be unaligned.
20 This function returns the 16-bit value pointed to by Buffer. The function
21 guarantees that the read operation does not produce an alignment fault.
23 If the Buffer is NULL, then ASSERT().
25 @param Buffer Pointer to a 16-bit value that may be unaligned.
33 IN CONST UINT16
*Buffer
36 ASSERT (Buffer
!= NULL
);
38 return (UINT16
)(((UINT8
*)Buffer
)[0] | (((UINT8
*)Buffer
)[1] << 8));
42 Writes a 16-bit value to memory that may be unaligned.
44 This function writes the 16-bit value specified by Value to Buffer. Value is
45 returned. The function guarantees that the write operation does not produce
48 If the Buffer is NULL, then ASSERT().
50 @param Buffer Pointer to a 16-bit value that may be unaligned.
51 @param Value 16-bit value to write to Buffer.
63 ASSERT (Buffer
!= NULL
);
65 ((UINT8
*)Buffer
)[0] = (UINT8
)Value
;
66 ((UINT8
*)Buffer
)[1] = (UINT8
)(Value
>> 8);
72 Reads a 24-bit value from memory that may be unaligned.
74 This function returns the 24-bit value pointed to by Buffer. The function
75 guarantees that the read operation does not produce an alignment fault.
77 If the Buffer is NULL, then ASSERT().
79 @param Buffer Pointer to a 24-bit value that may be unaligned.
81 @return The value read.
87 IN CONST UINT32
*Buffer
90 ASSERT (Buffer
!= NULL
);
93 ReadUnaligned16 ((UINT16
*)Buffer
) |
94 (((UINT8
*)Buffer
)[2] << 16)
99 Writes a 24-bit value to memory that may be unaligned.
101 This function writes the 24-bit value specified by Value to Buffer. Value is
102 returned. The function guarantees that the write operation does not produce
105 If the Buffer is NULL, then ASSERT().
107 @param Buffer Pointer to a 24-bit value that may be unaligned.
108 @param Value 24-bit value to write to Buffer.
110 @return The value written.
120 ASSERT (Buffer
!= NULL
);
122 WriteUnaligned16 ((UINT16
*)Buffer
, (UINT16
)Value
);
123 *(UINT8
*)((UINT16
*)Buffer
+ 1) = (UINT8
)(Value
>> 16);
128 Reads a 32-bit value from memory that may be unaligned.
130 This function returns the 32-bit value pointed to by Buffer. The function
131 guarantees that the read operation does not produce an alignment fault.
133 If the Buffer is NULL, then ASSERT().
135 @param Buffer Pointer to a 32-bit value that may be unaligned.
143 IN CONST UINT32
*Buffer
146 ASSERT (Buffer
!= NULL
);
149 ReadUnaligned16 ((UINT16
*)Buffer
) |
150 (ReadUnaligned16 ((UINT16
*)Buffer
+ 1) << 16)
155 Writes a 32-bit value to memory that may be unaligned.
157 This function writes the 32-bit value specified by Value to Buffer. Value is
158 returned. The function guarantees that the write operation does not produce
161 If the Buffer is NULL, then ASSERT().
163 @param Buffer Pointer to a 32-bit value that may be unaligned.
164 @param Value 32-bit value to write to Buffer.
176 ASSERT (Buffer
!= NULL
);
178 WriteUnaligned16 ((UINT16
*)Buffer
, (UINT16
)Value
);
179 WriteUnaligned16 ((UINT16
*)Buffer
+ 1, (UINT16
)(Value
>> 16));
184 Reads a 64-bit value from memory that may be unaligned.
186 This function returns the 64-bit value pointed to by Buffer. The function
187 guarantees that the read operation does not produce an alignment fault.
189 If the Buffer is NULL, then ASSERT().
191 @param Buffer Pointer to a 64-bit value that may be unaligned.
199 IN CONST UINT64
*Buffer
202 ASSERT (Buffer
!= NULL
);
205 ReadUnaligned32 ((UINT32
*)Buffer
) |
206 LShiftU64 (ReadUnaligned32 ((UINT32
*)Buffer
+ 1), 32)
211 Writes a 64-bit value to memory that may be unaligned.
213 This function writes the 64-bit value specified by Value to Buffer. Value is
214 returned. The function guarantees that the write operation does not produce
217 If the Buffer is NULL, then ASSERT().
219 @param Buffer Pointer to a 64-bit value that may be unaligned.
220 @param Value 64-bit value to write to Buffer.
232 ASSERT (Buffer
!= NULL
);
234 WriteUnaligned32 ((UINT32
*)Buffer
, (UINT32
)Value
);
235 WriteUnaligned32 ((UINT32
*)Buffer
+ 1, (UINT32
)RShiftU64 (Value
, 32));