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Score: Implement the function csum_ipv6_magic
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Signed-off-by: Lennox Wu <lennox.wu@gmail.com>
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Lennox Wu committed Sep 25, 2013
1 parent 5fbbf8a commit 1ed62ca
Showing 1 changed file with 51 additions and 42 deletions.
93 changes: 51 additions & 42 deletions arch/score/include/asm/checksum.h
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Original file line number Diff line number Diff line change
Expand Up @@ -184,48 +184,57 @@ static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
__wsum sum)
{
__asm__ __volatile__(
".set\tnoreorder\t\t\t# csum_ipv6_magic\n\t"
".set\tnoat\n\t"
"addu\t%0, %5\t\t\t# proto (long in network byte order)\n\t"
"sltu\t$1, %0, %5\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %6\t\t\t# csum\n\t"
"sltu\t$1, %0, %6\n\t"
"lw\t%1, 0(%2)\t\t\t# four words source address\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 4(%2)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 8(%2)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 12(%2)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 0(%3)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 4(%3)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 8(%3)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"lw\t%1, 12(%3)\n\t"
"addu\t%0, $1\n\t"
"addu\t%0, %1\n\t"
"sltu\t$1, %0, %1\n\t"
"addu\t%0, $1\t\t\t# Add final carry\n\t"
".set\tnoat\n\t"
".set\tnoreorder"
".set\tvolatile\t\t\t# csum_ipv6_magic\n\t"
"add\t%0, %0, %5\t\t\t# proto (long in network byte order)\n\t"
"cmp.c\t%5, %0\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %6\t\t\t# csum\n\t"
"cmp.c\t%6, %0\n\t"
"lw\t%1, [%2, 0]\t\t\t# four words source address\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"1:lw\t%1, [%2, 4]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"lw\t%1, [%2,8]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"lw\t%1, [%2, 12]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0,%1\n\t"
"cmp.c\t%1, %0\n\t"
"lw\t%1, [%3, 0]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"lw\t%1, [%3, 4]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"lw\t%1, [%3, 8]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"lw\t%1, [%3, 12]\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:add\t%0, %0, %1\n\t"
"cmp.c\t%1, %0\n\t"
"bleu 1f\n\t"
"addi\t%0, 0x1\n\t"
"1:\n\t"
".set\toptimize"
: "=r" (sum), "=r" (proto)
: "r" (saddr), "r" (daddr),
"0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
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