| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | |
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| 3 | #ifndef _LINUX_WORDPART_H |
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| 4 | #define _LINUX_WORDPART_H |
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| 5 | |
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| 6 | /** |
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| 7 | * upper_32_bits - return bits 32-63 of a number |
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| 8 | * @n: the number we're accessing |
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| 9 | * |
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| 10 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress |
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| 11 | * the "right shift count >= width of type" warning when that quantity is |
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| 12 | * 32-bits. |
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| 13 | */ |
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| 14 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) |
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| 15 | |
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| 16 | /** |
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| 17 | * lower_32_bits - return bits 0-31 of a number |
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| 18 | * @n: the number we're accessing |
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| 19 | */ |
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| 20 | #define lower_32_bits(n) ((u32)((n) & 0xffffffff)) |
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| 21 | |
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| 22 | /** |
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| 23 | * upper_16_bits - return bits 16-31 of a number |
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| 24 | * @n: the number we're accessing |
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| 25 | */ |
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| 26 | #define upper_16_bits(n) ((u16)((n) >> 16)) |
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| 27 | |
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| 28 | /** |
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| 29 | * lower_16_bits - return bits 0-15 of a number |
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| 30 | * @n: the number we're accessing |
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| 31 | */ |
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| 32 | #define lower_16_bits(n) ((u16)((n) & 0xffff)) |
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| 33 | |
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| 34 | /** |
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| 35 | * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value |
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| 36 | * @x: value to repeat |
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| 37 | * |
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| 38 | * NOTE: @x is not checked for > 0xff; larger values produce odd results. |
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| 39 | */ |
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| 40 | #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) |
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| 41 | |
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| 42 | /** |
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| 43 | * REPEAT_BYTE_U32 - repeat the value @x multiple times as a u32 value |
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| 44 | * @x: value to repeat |
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| 45 | * |
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| 46 | * NOTE: @x is not checked for > 0xff; larger values produce odd results. |
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| 47 | */ |
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| 48 | #define REPEAT_BYTE_U32(x) lower_32_bits(REPEAT_BYTE(x)) |
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| 49 | |
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| 50 | /* Set bits in the first 'n' bytes when loaded from memory */ |
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| 51 | #ifdef __LITTLE_ENDIAN |
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| 52 | # define aligned_byte_mask(n) ((1UL << 8*(n))-1) |
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| 53 | #else |
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| 54 | # define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n))) |
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| 55 | #endif |
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| 56 | |
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| 57 | #endif // _LINUX_WORDPART_H |
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| 58 | |
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