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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_WORDPART_H#define _LINUX_WORDPART_H
/** * upper_32_bits - return bits 32-63 of a number * @n: the number we're accessing * * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress * the "right shift count >= width of type" warning when that quantity is * 32-bits. */#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
/** * lower_32_bits - return bits 0-31 of a number * @n: the number we're accessing */#define lower_32_bits(n) ((u32)((n) & 0xffffffff))
/** * upper_16_bits - return bits 16-31 of a number * @n: the number we're accessing */#define upper_16_bits(n) ((u16)((n) >> 16))
/** * lower_16_bits - return bits 0-15 of a number * @n: the number we're accessing */#define lower_16_bits(n) ((u16)((n) & 0xffff))
/** * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value * @x: value to repeat * * NOTE: @x is not checked for > 0xff; larger values produce odd results. */#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
/** * REPEAT_BYTE_U32 - repeat the value @x multiple times as a u32 value * @x: value to repeat * * NOTE: @x is not checked for > 0xff; larger values produce odd results. */#define REPEAT_BYTE_U32(x) lower_32_bits(REPEAT_BYTE(x))
/* Set bits in the first 'n' bytes when loaded from memory */#ifdef __LITTLE_ENDIAN# define aligned_byte_mask(n) ((1UL << 8*(n))-1)#else# define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))#endif
#endif // _LINUX_WORDPART_H