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Macros
#define	upper_32_bits(n) ((u32)(((n) >> 16) >> 16))

#define	lower_32_bits(n) ((u32)((n) & 0xffffffff))

#define	upper_16_bits(n) ((u16)((n) >> 16))

#define	lower_16_bits(n) ((u16)((n) & 0xffff))

#define	REPEAT_BYTE(x) ((~0ul / 0xff) * (x))

#define	REPEAT_BYTE_U32(x) lower_32_bits(REPEAT_BYTE(x))

#define	aligned_byte_mask(n) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))

Macro Definition Documentation

◆ aligned_byte_mask

#define aligned_byte_mask ( n ) (~0xffUL << (BITS_PER_LONG - 8 - 8*(n)))

#define lower_16_bits ( n ) ((u16)((n) & 0xffff))

lower_16_bits - return bits 0-15 of a number
: the number we're accessing

#define lower_32_bits ( n ) ((u32)((n) & 0xffffffff))

lower_32_bits - return bits 0-31 of a number
: the number we're accessing

#define REPEAT_BYTE ( x ) ((~0ul / 0xff) * (x))

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_U32 ( x ) lower_32_bits(REPEAT_BYTE(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 upper_16_bits ( n ) ((u16)((n) >> 16))

upper_16_bits - return bits 16-31 of a number
: the number we're accessing

#define upper_32_bits ( n ) ((u32)(((n) >> 16) >> 16))

upper_32_bits - return bits 32-63 of a number
: 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.