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File: [Development] / linux-2.6-xfs / arch / sparc64 / lib / ipcsum.S (download)

Revision 1.2, Fri Oct 1 15:10:15 2004 UTC (13 years ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
CVS Tags: HEAD
Changes since 1.1: +4 -2 lines 

Upgrade kernel to 2.6.9-rc3 and kdb to 4.4
Merge of 2.6.x-xfs-melb:linux:19628a by kenmcd.

	.text
	.align	32
	.globl	ip_fast_csum
	.type	ip_fast_csum,#function
ip_fast_csum:	/* %o0 = iph, %o1 = ihl */
	sub	%o1, 4, %g7
	lduw	[%o0 + 0x00], %o2
	lduw	[%o0 + 0x04], %g2
	lduw	[%o0 + 0x08], %g3
	addcc	%g2, %o2, %o2
	lduw	[%o0 + 0x0c], %g2
	addccc	%g3, %o2, %o2
	lduw	[%o0 + 0x10], %g3

	addccc	%g2, %o2, %o2
	addc	%o2, %g0, %o2
1:	addcc	%g3, %o2, %o2
	add	%o0, 4, %o0
	addccc	%o2, %g0, %o2
	subcc	%g7, 1, %g7
	be,a,pt	%icc, 2f
	 sll	%o2, 16, %g2

	lduw	[%o0 + 0x10], %g3
	ba,pt	%xcc, 1b
	 nop
2:	addcc	%o2, %g2, %g2
	srl	%g2, 16, %o2
	addc	%o2, %g0, %o2
	xnor	%g0, %o2, %o2
	set	0xffff, %o1
	retl
	 and	%o2, %o1, %o0
	.size	ip_fast_csum, .-ip_fast_csum