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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/alpha/lib/csum_ipv6_magic.S
3 * Contributed by Richard Henderson <rth@tamu.edu>
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);
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070010 *
11 * Misalignment handling (which costs 16 instructions / 8 cycles)
12 * added by Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 */
14
15 .globl csum_ipv6_magic
16 .align 4
17 .ent csum_ipv6_magic
18 .frame $30,0,$26,0
19csum_ipv6_magic:
20 .prologue 0
21
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070022 ldq_u $0,0($16) # e0 : load src & dst addr words
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 zapnot $20,15,$20 # .. e1 : zero extend incoming csum
24 extqh $18,1,$4 # e0 : byte swap len & proto while we wait
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070025 ldq_u $21,7($16) # .. e1 : handle misalignment
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27 extbl $18,1,$5 # e0 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070028 ldq_u $1,8($16) # .. e1 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 extbl $18,2,$6 # e0 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070030 ldq_u $22,15($16) # .. e1 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32 extbl $18,3,$18 # e0 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070033 ldq_u $2,0($17) # .. e1 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 sra $4,32,$4 # e0 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070035 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 sll $5,16,$5 # e0 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070043 or $0,$21,$0 # .. e1 : 1st src word complete
44 extql $1,$16,$1 # e0 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 addq $20,$0,$20 # .. e1 : begin summing the words
46
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070047 extqh $22,$16,$22 # e0 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 cmpult $20,$0,$0 # .. e1 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070049 sll $6,8,$6 # e0 :
50 or $1,$22,$1 # .. e1 : 2nd src word complete
51
52 extql $2,$17,$2 # e0 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 or $4,$18,$18 # .. e1 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070054 extqh $23,$17,$23 # e0 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 or $5,$6,$5 # .. e1 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070057 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 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 addq $20,$1,$20 # .. e1 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -070067 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 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 :
Ivan Kokshaysky58ed2f92007-06-23 17:16:35 -0700110 not $0,$0 # .. e1 : and complement.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 zapnot $0,3,$0 # e0 :
113 ret # .. e1 :
114
115 .end csum_ipv6_magic