diff options
Diffstat (limited to 'arch/alpha/lib/csum_ipv6_magic.S')
| -rw-r--r-- | arch/alpha/lib/csum_ipv6_magic.S | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/alpha/lib/csum_ipv6_magic.S b/arch/alpha/lib/csum_ipv6_magic.S new file mode 100644 index 000000000..c7b213ab0 --- /dev/null +++ b/arch/alpha/lib/csum_ipv6_magic.S @@ -0,0 +1,118 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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> + */ + +#include <asm/export.h> + .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 + EXPORT_SYMBOL(csum_ipv6_magic) |