From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/sparc/lib/ipcsum.S | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 arch/sparc/lib/ipcsum.S

(limited to 'arch/sparc/lib/ipcsum.S')

diff --git a/arch/sparc/lib/ipcsum.S b/arch/sparc/lib/ipcsum.S
new file mode 100644
index 00000000..4742d590
--- /dev/null
+++ b/arch/sparc/lib/ipcsum.S
@@ -0,0 +1,33 @@
+#include <linux/linkage.h>
+
+	.text
+ENTRY(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
+ENDPROC(ip_fast_csum)
-- 
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