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 /** 43 * REPEAT_BYTE_U32 - repeat the value @x multiple times as a u32 value 44 * @x: value to repeat 45 * 46 * NOTE: @x is not checked for > 0xff; larger values produce odd results. 47 */ 48 #define REPEAT_BYTE_U32(x) lower_32_bits(REPEAT_BYTE(x)) 49 50 /* Set bits in the first 'n' bytes when loaded from memory */ 51 #ifdef __LITTLE_ENDIAN 52 # define aligned_byte_mask(n) ((1UL << 8*(n))-1) 53 #else 54 # define aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n))) 55 #endif 56 57 #endif // _LINUX_WORDPART_H 58