From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/alpha/lib/csum_ipv6_magic.S | 115 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 arch/alpha/lib/csum_ipv6_magic.S

(limited to 'arch/alpha/lib/csum_ipv6_magic.S')

diff --git a/arch/alpha/lib/csum_ipv6_magic.S b/arch/alpha/lib/csum_ipv6_magic.S
new file mode 100644
index 00000000..2c2acb96
--- /dev/null
+++ b/arch/alpha/lib/csum_ipv6_magic.S
@@ -0,0 +1,115 @@
+/*
+ * arch/alpha/lib/csum_ipv6_magic.S
+ * Contributed by Richard Henderson <rth@tamu.edu>
+ *
+ * unsigned short csum_ipv6_magic(struct in6_addr *saddr,
+ *                                struct in6_addr *daddr,
+ *                                __u32 len,
+ *                                unsigned short proto,
+ *                                unsigned int csum);
+ *
+ * Misalignment handling (which costs 16 instructions / 8 cycles)
+ * added by Ivan Kokshaysky <ink@jurassic.park.msu.ru>
+ */
+
+	.globl csum_ipv6_magic
+	.align 4
+	.ent csum_ipv6_magic
+	.frame $30,0,$26,0
+csum_ipv6_magic:
+	.prologue 0
+
+	ldq_u	$0,0($16)	# e0    : load src & dst addr words
+	zapnot	$20,15,$20	# .. e1 : zero extend incoming csum
+	extqh	$18,1,$4	# e0    : byte swap len & proto while we wait
+	ldq_u	$21,7($16)	# .. e1 : handle misalignment
+
+	extbl	$18,1,$5	# e0	:
+	ldq_u	$1,8($16)	# .. e1 :
+	extbl	$18,2,$6	# e0 	:
+	ldq_u	$22,15($16)	# .. e1 :
+
+	extbl	$18,3,$18	# e0	:
+	ldq_u	$2,0($17)	# .. e1 :
+	sra	$4,32,$4	# e0	:
+	ldq_u	$23,7($17)	# .. e1 :
+
+	extql	$0,$16,$0	# e0	:
+	ldq_u	$3,8($17)	# .. e1 :
+	extqh	$21,$16,$21	# e0	:
+	ldq_u	$24,15($17)	# .. e1 :
+
+	sll	$5,16,$5	# e0	:
+	or	$0,$21,$0	# .. e1 : 1st src word complete
+	extql	$1,$16,$1	# e0	:
+	addq	$20,$0,$20	# .. e1 : begin summing the words
+
+	extqh	$22,$16,$22	# e0	:
+	cmpult	$20,$0,$0	# .. e1 :
+	sll	$6,8,$6		# e0	:
+	or	$1,$22,$1	# .. e1 : 2nd src word complete
+
+	extql	$2,$17,$2	# e0	:
+	or	$4,$18,$18	# .. e1 :
+	extqh	$23,$17,$23	# e0	:
+	or	$5,$6,$5	# .. e1 :
+
+	extql	$3,$17,$3	# e0	:
+	or	$2,$23,$2	# .. e1 : 1st dst word complete
+	extqh	$24,$17,$24	# e0	:
+	or	$18,$5,$18	# .. e1 : len complete
+
+	extwh	$19,7,$7	# e0    :
+	or	$3,$24,$3	# .. e1 : 2nd dst word complete
+	extbl	$19,1,$19	# e0    :
+	addq	$20,$1,$20	# .. e1 :
+
+	or	$19,$7,$19	# e0    :
+	cmpult	$20,$1,$1	# .. e1 :
+	sll	$19,48,$19	# e0    :
+	nop			# .. e0 :
+
+	sra	$19,32,$19	# e0    : proto complete
+	addq	$20,$2,$20	# .. e1 :
+	cmpult	$20,$2,$2	# e0    :
+	addq	$20,$3,$20	# .. e1 :
+
+	cmpult	$20,$3,$3	# e0    :
+	addq	$20,$18,$20	# .. e1 :
+	cmpult	$20,$18,$18	# e0    :
+	addq	$20,$19,$20	# .. e1 :
+
+	cmpult	$20,$19,$19	# e0    :
+	addq	$0,$1,$0	# .. e1 : merge the carries back into the csum
+	addq	$2,$3,$2	# e0    :
+	addq	$18,$19,$18	# .. e1 :
+
+	addq	$0,$2,$0	# e0    :
+	addq	$20,$18,$20	# .. e1 :
+	addq	$0,$20,$0	# e0    :
+	unop			#       :
+
+	extwl	$0,2,$2		# e0    : begin folding the 64-bit value
+	zapnot	$0,3,$3		# .. e1 :
+	extwl	$0,4,$1		# e0    :
+	addq	$2,$3,$3	# .. e1 :
+
+	extwl	$0,6,$0		# e0    :
+	addq	$3,$1,$3	# .. e1 :
+	addq	$0,$3,$0	# e0    :
+	unop			#       :
+
+	extwl	$0,2,$1		# e0    : fold 18-bit value
+	zapnot	$0,3,$0		# .. e1 :
+	addq	$0,$1,$0	# e0    :
+	unop			#       :
+
+	extwl	$0,2,$1		# e0    : fold 17-bit value
+	zapnot	$0,3,$0		# .. e1 :
+	addq	$0,$1,$0	# e0    :
+	not	$0,$0		# .. e1 : and complement.
+
+	zapnot	$0,3,$0		# e0    :
+	ret			# .. e1 :
+
+	.end csum_ipv6_magic
-- 
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