Mathematical operations

Collection of macros to perform simple and common math operations. More...

Collaboration diagram for Mathematical operations:

Macros
#define	MAX(_x, _y)
	Compute the maximum value between 2 numbers.
#define	MIN(_x, _y)
	Compute the minimum value between 2 numbers.
#define	ABS(_x)
	Compute the absolute value of a number.
#define	align_up(_value, _power)    ((((_value)-1) | __align_mask(_value, _power)) + 1)
	Align _value to the next multiple of _power. More...
#define	align_down(_value, _power)   ((_value) & ~__align_mask(_value, _power))
	Align _value to the previous multiple of _power. More...
#define	is_aligned(_value, _alignment)   (!((_value) % (_alignment)))

Functions
static u32	round_up (u32 value, u32 alignment)
	Round value to the next multiple of alignment. More...
static u32	round_down (u32 value, u32 alignment)
	Round value to the previous multiple of alignment. More...

Detailed Description

Macro Definition Documentation

align_down

#define align_down	(		_value,
			_power
	)		((_value) & ~__align_mask(_value, _power))

Warning

This macro assumes _power is a power of 2. When using an arbitrary value, you must use round_down instead.

align_up

#define align_up	(		_value,
			_power
	)		((((_value)-1) | __align_mask(_value, _power)) + 1)

Warning

This macro assumes _power is a power of 2. When using an arbitrary value, you must use round_up instead.

is_aligned

#define is_aligned	(		_value,
			_alignment
	)		(!((_value) % (_alignment)))

Returns

Whether a value is aligned onto a given boundary

Function Documentation

round_down()

static u32 round_down ( u32  value, u32  alignment  )

inlinestatic

When rounding to a power of two, prefere using align_down instead.

round_up()

static u32 round_up ( u32  value, u32  alignment  )

inlinestatic

When rounding to a power of two, prefere using align_up instead.

Warning

This function does not check against overflow