CO_MATH
[COMMON]

Optimized math functions and other computations. More...

Collaboration diagram for CO_MATH:

Defines
#define	CO_ALIGN4_HI(val)   (((val)+3)&~3)
	Align val on the multiple of 4 equal or nearest higher.
#define	CO_ALIGNx_HI(val, x)   (((val)+((x)-1))&~((x)-1))
	Align val on the multiple of a given number equal or nearest higher.
#define	CO_ALIGN4_LO(val)   ((val)&~3)
	Align val on the multiple of 4 equal or nearest lower.
#define	CO_ALIGN2_HI(val)   (((val)+1)&~1)
	Align val on the multiple of 2 equal or nearest higher.
#define	CO_ALIGN2_LO(val)   ((val)&~1)
	Align val on the multiple of 2 equal or nearest lower.
Functions
uint32_t	co_crc32 (uint32_t addr, uint32_t len, uint32_t crc)
	Compute a CRC32 on the buffer passed as parameter.
__INLINE uint32_t	co_clz (uint32_t val)
	Count leading zeros.
__INLINE void	co_random_init (uint32_t seed)
	Function to initialize the random seed.
__INLINE uint8_t	co_rand_byte (void)
	Function to get an 8 bit random number.
__INLINE uint16_t	co_rand_hword (void)
	Function to get an 16 bit random number.
__INLINE uint32_t	co_rand_word (void)
	Function to get an 32 bit random number.
__INLINE uint32_t	co_min (uint32_t a, uint32_t b)
	Function to return the smallest of 2 unsigned 32 bits words.
__INLINE uint32_t	co_max (uint32_t a, uint32_t b)
	Function to return the greatest of 2 unsigned 32 bits words.
__INLINE int	co_abs (int val)
	Function to return the absolute value of a signed integer.
Variables
static const uint32_t	crc_tab [256]
	CRC lookup table.

---

Detailed Description

Optimized math functions and other computations.

---

Define Documentation

#define CO_ALIGN2_HI

(

val

)

(((val)+1)&~1)

Align val on the multiple of 2 equal or nearest higher.

Parameters:

[in]

val

Value to align.

Returns:

Value aligned.

Definition at line 78 of file co_math.h.

#define CO_ALIGN2_LO

(

val

)

((val)&~1)

Align val on the multiple of 2 equal or nearest lower.

Parameters:

[in]

val

Value to align.

Returns:

Value aligned.

Definition at line 88 of file co_math.h.

#define CO_ALIGN4_HI

(

val

)

(((val)+3)&~3)

Align val on the multiple of 4 equal or nearest higher.

Parameters:

[in]

val

Value to align.

Returns:

Value aligned.

Definition at line 47 of file co_math.h.

Referenced by co_copy32(), txl_buffer_get_params(), and txl_mpdu_subframe_len().

#define CO_ALIGN4_LO

(

val

)

((val)&~3)

Align val on the multiple of 4 equal or nearest lower.

Parameters:

[in]

val

Value to align.

Returns:

Value aligned.

Definition at line 69 of file co_math.h.

Referenced by rxl_go_to_last_rbd(), and rxl_rxcntrl_frame().

#define CO_ALIGNx_HI	(	val,
		x		)	(((val)+((x)-1))&~((x)-1))

Align val on the multiple of a given number equal or nearest higher.

x value should be a power of 2.

Parameters:

[in]	val	Value to align.
[in]	x	Multiple value.

Returns:

Value aligned.

Definition at line 60 of file co_math.h.

---

Function Documentation

__INLINE int co_abs

(

int

val

)

Function to return the absolute value of a signed integer.

Parameters:

[in]

val

Value

Returns:

The absolute value of val.

Definition at line 236 of file co_math.h.

Referenced by chan_p2p_noa_resync_check().

__INLINE uint32_t co_clz

(

uint32_t

val

)

Count leading zeros.

Parameters:

[in]

val

Value to count the number of leading zeros on.

Returns:

Number of leading zeros when value is written as 32 bits.

Definition at line 102 of file co_math.h.

Referenced by apm_start_req_handler(), rc_get_initial_rate_config(), and scanu_join_frame_handler().

uint32_t co_crc32	(	uint32_t	addr,
		uint32_t	len,
		uint32_t	crc
	)

Compute a CRC32 on the buffer passed as parameter.

The initial value of the computation is taken from crc parameter, allowing for incremental computation.

Parameters:

[in]	addr	Pointer to the buffer on which the CRC has to be computed
[in]	len	Length of the buffer
[in]	crc	The initial value of the CRC computation

Returns:

The CRC computed on the buffer.

Referenced by mm_compute_beacon_crc().

__INLINE uint32_t co_max	(	uint32_t	a,
		uint32_t	b
	)

Function to return the greatest of 2 unsigned 32 bits words.

Parameters:

[in]	a	First value
[in]	b	Second value

Returns:

The greatest value between a and b

Definition at line 224 of file co_math.h.

Referenced by rc_set_previous_mcs_index().

__INLINE uint32_t co_min	(	uint32_t	a,
		uint32_t	b
	)

Function to return the smallest of 2 unsigned 32 bits words.

Parameters:

[in]	a	First value
[in]	b	Second value

Returns:

The smallest value between a and b

Definition at line 211 of file co_math.h.

Referenced by bfr_check_next_nodes(), chan_start_p2pgo_noa(), dbg_vsnprintf_offset(), me_add_ie_supp_rates(), me_get_sta_bw(), me_pol_tbl_bw_upd(), me_rate_bitfield_vht_build(), me_set_sta_ht_vht_param(), me_sta_bw_nss_max_upd(), p2p_cli_noa_get_abs_time(), rc_set_max_amsdu_len(), rc_set_next_mcs_index(), rxu_mgt_ind_handler(), and txl_ampdu_constraints_get().

__INLINE uint8_t co_rand_byte

(

void

)

Function to get an 8 bit random number.

Returns:

Random byte value.

Definition at line 176 of file co_math.h.

Referenced by bam_create_ba_agg().

__INLINE uint16_t co_rand_hword

(

void

)

Function to get an 16 bit random number.

Returns:

Random half word value.

Definition at line 187 of file co_math.h.

Referenced by rc_new_random_rate(), and rc_set_trial_tx().

__INLINE uint32_t co_rand_word

(

void

)

Function to get an 32 bit random number.

Returns:

Random word value.

Definition at line 198 of file co_math.h.

__INLINE void co_random_init

(

uint32_t

seed

)

Function to initialize the random seed.

Parameters:

[in]

seed

The seed number to use to generate the random sequence.

Definition at line 165 of file co_math.h.