[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / metag / lib / ip_fast_csum.S


	.text
/*
 * This is a version of ip_compute_csum() optimized for IP headers,
 * which always checksum on 4 octet boundaries.
 *
 * extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 *
 */
	.global _ip_fast_csum
	.type   _ip_fast_csum,function
_ip_fast_csum:
	!! TXRPT needs loops - 1
	SUBS	TXRPT,D0Ar2,#1
	MOV	D0Re0,#0
	BLO	$Lfast_csum_exit
$Lfast_csum_loop:
	GETD	D1Ar3,[D1Ar1++]
	ADDS	D0Re0,D0Re0,D1Ar3
	ADDCS   D0Re0,D0Re0,#1
	BR	$Lfast_csum_loop
	LSR	D0Ar4,D0Re0,#16
	AND	D0Re0,D0Re0,#0xffff
	AND	D0Ar4,D0Ar4,#0xffff
	ADD	D0Re0,D0Re0,D0Ar4
	LSR	D0Ar4,D0Re0,#16
	ADD	D0Re0,D0Re0,D0Ar4
	XOR	D0Re0,D0Re0,#-1
	AND	D0Re0,D0Re0,#0xffff
$Lfast_csum_exit:
	MOV	PC,D1RtP
	.size _ip_fast_csum,.-_ip_fast_csum
Commit	Line	Data
086e9dc0 JH	1
	2	.text
	3	/*
	4	* This is a version of ip_compute_csum() optimized for IP headers,
	5	* which always checksum on 4 octet boundaries.
	6	*
	7	* extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
	8	*
	9	*/
	10	.global _ip_fast_csum
	11	.type _ip_fast_csum,function
	12	_ip_fast_csum:
	13	!! TXRPT needs loops - 1
	14	SUBS TXRPT,D0Ar2,#1
	15	MOV D0Re0,#0
	16	BLO $Lfast_csum_exit
	17	$Lfast_csum_loop:
	18	GETD D1Ar3,[D1Ar1++]
	19	ADDS D0Re0,D0Re0,D1Ar3
	20	ADDCS D0Re0,D0Re0,#1
	21	BR $Lfast_csum_loop
	22	LSR D0Ar4,D0Re0,#16
	23	AND D0Re0,D0Re0,#0xffff
	24	AND D0Ar4,D0Ar4,#0xffff
	25	ADD D0Re0,D0Re0,D0Ar4
	26	LSR D0Ar4,D0Re0,#16
	27	ADD D0Re0,D0Re0,D0Ar4
	28	XOR D0Re0,D0Re0,#-1
	29	AND D0Re0,D0Re0,#0xffff
	30	$Lfast_csum_exit:
	31	MOV PC,D1RtP
	32	.size _ip_fast_csum,.-_ip_fast_csum