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93 lines
2.2 KiB
93 lines
2.2 KiB
20 years ago
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/*
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* arch/alpha/lib/csum_ipv6_magic.S
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* Contributed by Richard Henderson <rth@tamu.edu>
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*
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* unsigned short csum_ipv6_magic(struct in6_addr *saddr,
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* struct in6_addr *daddr,
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* __u32 len,
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* unsigned short proto,
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* unsigned int csum);
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*/
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.globl csum_ipv6_magic
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.align 4
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.ent csum_ipv6_magic
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.frame $30,0,$26,0
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csum_ipv6_magic:
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.prologue 0
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ldq $0,0($16) # e0 : load src & dst addr words
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zapnot $20,15,$20 # .. e1 : zero extend incoming csum
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extqh $18,1,$4 # e0 : byte swap len & proto while we wait
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ldq $1,8($16) # .. e1 :
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extbl $18,1,$5 # e0 :
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ldq $2,0($17) # .. e1 :
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extbl $18,2,$6 # e0 :
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ldq $3,8($17) # .. e1 :
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extbl $18,3,$18 # e0 :
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sra $4,32,$4 # e0 :
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sll $5,16,$5 # e0 :
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addq $20,$0,$20 # .. e1 : begin summing the words
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sll $6,8,$6 # e0 :
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cmpult $20,$0,$0 # .. e1 :
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extwh $19,7,$7 # e0 :
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or $4,$18,$18 # .. e1 :
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extbl $19,1,$19 # e0 :
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or $5,$6,$5 # .. e1 :
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or $18,$5,$18 # e0 : len complete
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or $19,$7,$19 # .. e1 :
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sll $19,48,$19 # e0 :
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addq $20,$1,$20 # .. e1 :
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sra $19,32,$19 # e0 : proto complete
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cmpult $20,$1,$1 # .. e1 :
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nop # e0 :
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addq $20,$2,$20 # .. e1 :
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cmpult $20,$2,$2 # e0 :
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addq $20,$3,$20 # .. e1 :
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cmpult $20,$3,$3 # e0 :
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addq $20,$18,$20 # .. e1 :
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cmpult $20,$18,$18 # e0 :
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addq $20,$19,$20 # .. e1 :
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cmpult $20,$19,$19 # e0 :
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addq $0,$1,$0 # .. e1 : merge the carries back into the csum
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addq $2,$3,$2 # e0 :
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addq $18,$19,$18 # .. e1 :
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addq $0,$2,$0 # e0 :
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addq $20,$18,$20 # .. e1 :
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addq $0,$20,$0 # e0 :
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unop # :
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extwl $0,2,$2 # e0 : begin folding the 64-bit value
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zapnot $0,3,$3 # .. e1 :
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extwl $0,4,$1 # e0 :
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addq $2,$3,$3 # .. e1 :
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extwl $0,6,$0 # e0 :
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addq $3,$1,$3 # .. e1 :
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addq $0,$3,$0 # e0 :
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unop # :
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extwl $0,2,$1 # e0 : fold 18-bit value
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zapnot $0,3,$0 # .. e1 :
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addq $0,$1,$0 # e0 :
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unop # :
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extwl $0,2,$1 # e0 : fold 17-bit value
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zapnot $0,3,$0 # .. e1 :
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addq $0,$1,$0 # e0 :
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not $0,$0 # e1 : and complement.
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zapnot $0,3,$0 # e0 :
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ret # .. e1 :
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.end csum_ipv6_magic
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