1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | |
3 | #ifndef _LINUX_WORDPART_H |
4 | #define _LINUX_WORDPART_H |
5 | |
6 | /** |
7 | * upper_32_bits - return bits 32-63 of a number |
8 | * @n: the number we're accessing |
9 | * |
10 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
11 | * the "right shift count >= width of type" warning when that quantity is |
12 | * 32-bits. |
13 | */ |
14 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
15 | |
16 | /** |
17 | * lower_32_bits - return bits 0-31 of a number |
18 | * @n: the number we're accessing |
19 | */ |
20 | #define lower_32_bits(n) ((u32)((n) & 0xffffffff)) |
21 | |
22 | /** |
23 | * upper_16_bits - return bits 16-31 of a number |
24 | * @n: the number we're accessing |
25 | */ |
26 | #define upper_16_bits(n) ((u16)((n) >> 16)) |
27 | |
28 | /** |
29 | * lower_16_bits - return bits 0-15 of a number |
30 | * @n: the number we're accessing |
31 | */ |
32 | #define lower_16_bits(n) ((u16)((n) & 0xffff)) |
33 | |
34 | /** |
35 | * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value |
36 | * @x: value to repeat |
37 | * |
38 | * NOTE: @x is not checked for > 0xff; larger values produce odd results. |
39 | */ |
40 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
41 | |
42 | #endif // _LINUX_WORDPART_H |
43 | |