Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/alpha/lib/csum_ipv6_magic.S
10817 views
1
/*

2
 * arch/alpha/lib/csum_ipv6_magic.S

3
 * Contributed by Richard Henderson <[email protected]>

4
 *

5
 * unsigned short csum_ipv6_magic(struct in6_addr *saddr,

6
 *                                struct in6_addr *daddr,

7
 *                                __u32 len,

8
 *                                unsigned short proto,

9
 *                                unsigned int csum);

10
 *

11
 * Misalignment handling (which costs 16 instructions / 8 cycles)

12
 * added by Ivan Kokshaysky <[email protected]>

13
 */

14


15
	.globl csum_ipv6_magic

16
	.align 4

17
	.ent csum_ipv6_magic

18
	.frame $30,0,$26,0

19
csum_ipv6_magic:

20
	.prologue 0

21


22
	ldq_u	$0,0($16)	# e0    : load src & dst addr words

23
	zapnot	$20,15,$20	# .. e1 : zero extend incoming csum

24
	extqh	$18,1,$4	# e0    : byte swap len & proto while we wait

25
	ldq_u	$21,7($16)	# .. e1 : handle misalignment

26


27
	extbl	$18,1,$5	# e0	:

28
	ldq_u	$1,8($16)	# .. e1 :

29
	extbl	$18,2,$6	# e0 	:

30
	ldq_u	$22,15($16)	# .. e1 :

31


32
	extbl	$18,3,$18	# e0	:

33
	ldq_u	$2,0($17)	# .. e1 :

34
	sra	$4,32,$4	# e0	:

35
	ldq_u	$23,7($17)	# .. e1 :

36


37
	extql	$0,$16,$0	# e0	:

38
	ldq_u	$3,8($17)	# .. e1 :

39
	extqh	$21,$16,$21	# e0	:

40
	ldq_u	$24,15($17)	# .. e1 :

41


42
	sll	$5,16,$5	# e0	:

43
	or	$0,$21,$0	# .. e1 : 1st src word complete

44
	extql	$1,$16,$1	# e0	:

45
	addq	$20,$0,$20	# .. e1 : begin summing the words

46


47
	extqh	$22,$16,$22	# e0	:

48
	cmpult	$20,$0,$0	# .. e1 :

49
	sll	$6,8,$6		# e0	:

50
	or	$1,$22,$1	# .. e1 : 2nd src word complete

51


52
	extql	$2,$17,$2	# e0	:

53
	or	$4,$18,$18	# .. e1 :

54
	extqh	$23,$17,$23	# e0	:

55
	or	$5,$6,$5	# .. e1 :

56


57
	extql	$3,$17,$3	# e0	:

58
	or	$2,$23,$2	# .. e1 : 1st dst word complete

59
	extqh	$24,$17,$24	# e0	:

60
	or	$18,$5,$18	# .. e1 : len complete

61


62
	extwh	$19,7,$7	# e0    :

63
	or	$3,$24,$3	# .. e1 : 2nd dst word complete

64
	extbl	$19,1,$19	# e0    :

65
	addq	$20,$1,$20	# .. e1 :

66


67
	or	$19,$7,$19	# e0    :

68
	cmpult	$20,$1,$1	# .. e1 :

69
	sll	$19,48,$19	# e0    :

70
	nop			# .. e0 :

71


72
	sra	$19,32,$19	# e0    : proto complete

73
	addq	$20,$2,$20	# .. e1 :

74
	cmpult	$20,$2,$2	# e0    :

75
	addq	$20,$3,$20	# .. e1 :

76


77
	cmpult	$20,$3,$3	# e0    :

78
	addq	$20,$18,$20	# .. e1 :

79
	cmpult	$20,$18,$18	# e0    :

80
	addq	$20,$19,$20	# .. e1 :

81


82
	cmpult	$20,$19,$19	# e0    :

83
	addq	$0,$1,$0	# .. e1 : merge the carries back into the csum

84
	addq	$2,$3,$2	# e0    :

85
	addq	$18,$19,$18	# .. e1 :

86


87
	addq	$0,$2,$0	# e0    :

88
	addq	$20,$18,$20	# .. e1 :

89
	addq	$0,$20,$0	# e0    :

90
	unop			#       :

91


92
	extwl	$0,2,$2		# e0    : begin folding the 64-bit value

93
	zapnot	$0,3,$3		# .. e1 :

94
	extwl	$0,4,$1		# e0    :

95
	addq	$2,$3,$3	# .. e1 :

96


97
	extwl	$0,6,$0		# e0    :

98
	addq	$3,$1,$3	# .. e1 :

99
	addq	$0,$3,$0	# e0    :

100
	unop			#       :

101


102
	extwl	$0,2,$1		# e0    : fold 18-bit value

103
	zapnot	$0,3,$0		# .. e1 :

104
	addq	$0,$1,$0	# e0    :

105
	unop			#       :

106


107
	extwl	$0,2,$1		# e0    : fold 17-bit value

108
	zapnot	$0,3,$0		# .. e1 :

109
	addq	$0,$1,$0	# e0    :

110
	not	$0,$0		# .. e1 : and complement.

111


112
	zapnot	$0,3,$0		# e0    :

113
	ret			# .. e1 :

114


115
	.end csum_ipv6_magic

116


117