| /* checksum.h: FRV checksumming |
| * |
| * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #ifndef _ASM_CHECKSUM_H |
| #define _ASM_CHECKSUM_H |
| |
| #include <linux/in6.h> |
| |
| /* |
| * computes the checksum of a memory block at buff, length len, |
| * and adds in "sum" (32-bit) |
| * |
| * returns a 32-bit number suitable for feeding into itself |
| * or csum_tcpudp_magic |
| * |
| * this function must be called with even lengths, except |
| * for the last fragment, which may be odd |
| * |
| * it's best to have buff aligned on a 32-bit boundary |
| */ |
| __wsum csum_partial(const void *buff, int len, __wsum sum); |
| |
| /* |
| * the same as csum_partial, but copies from src while it |
| * checksums |
| * |
| * here even more important to align src and dst on a 32-bit (or even |
| * better 64-bit) boundary |
| */ |
| __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); |
| |
| /* |
| * the same as csum_partial_copy, but copies from user space. |
| * |
| * here even more important to align src and dst on a 32-bit (or even |
| * better 64-bit) boundary |
| */ |
| extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
| int len, __wsum sum, int *csum_err); |
| |
| /* |
| * This is a version of ip_compute_csum() optimized for IP headers, |
| * which always checksum on 4 octet boundaries. |
| * |
| */ |
| static inline |
| __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
| { |
| unsigned int tmp, inc, sum = 0; |
| |
| asm(" addcc gr0,gr0,gr0,icc0\n" /* clear icc0.C */ |
| " subi %1,#4,%1 \n" |
| "0: \n" |
| " ldu.p @(%1,%3),%4 \n" |
| " subicc %2,#1,%2,icc1 \n" |
| " addxcc.p %4,%0,%0,icc0 \n" |
| " bhi icc1,#2,0b \n" |
| |
| /* fold the 33-bit result into 16-bits */ |
| " addxcc gr0,%0,%0,icc0 \n" |
| " srli %0,#16,%1 \n" |
| " sethi #0,%0 \n" |
| " add %1,%0,%0 \n" |
| " srli %0,#16,%1 \n" |
| " add %1,%0,%0 \n" |
| |
| : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (inc), "=&r"(tmp) |
| : "0" (sum), "1" (iph), "2" (ihl), "3" (4), |
| "m"(*(volatile struct { int _[100]; } *)iph) |
| : "icc0", "icc1" |
| ); |
| |
| return (__force __sum16)~sum; |
| } |
| |
| /* |
| * Fold a partial checksum |
| */ |
| static inline __sum16 csum_fold(__wsum sum) |
| { |
| unsigned int tmp; |
| |
| asm(" srli %0,#16,%1 \n" |
| " sethi #0,%0 \n" |
| " add %1,%0,%0 \n" |
| " srli %0,#16,%1 \n" |
| " add %1,%0,%0 \n" |
| : "=r"(sum), "=&r"(tmp) |
| : "0"(sum) |
| ); |
| |
| return (__force __sum16)~sum; |
| } |
| |
| /* |
| * computes the checksum of the TCP/UDP pseudo-header |
| * returns a 16-bit checksum, already complemented |
| */ |
| static inline __wsum |
| csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, |
| unsigned short proto, __wsum sum) |
| { |
| asm(" addcc %1,%0,%0,icc0 \n" |
| " addxcc %2,%0,%0,icc0 \n" |
| " addxcc %3,%0,%0,icc0 \n" |
| " addxcc gr0,%0,%0,icc0 \n" |
| : "=r" (sum) |
| : "r" (daddr), "r" (saddr), "r" (len + proto), "0"(sum) |
| : "icc0" |
| ); |
| return sum; |
| } |
| |
| static inline __sum16 |
| csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, |
| unsigned short proto, __wsum sum) |
| { |
| return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); |
| } |
| |
| /* |
| * this routine is used for miscellaneous IP-like checksums, mainly |
| * in icmp.c |
| */ |
| extern __sum16 ip_compute_csum(const void *buff, int len); |
| |
| #define _HAVE_ARCH_IPV6_CSUM |
| static inline __sum16 |
| csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, |
| __u32 len, unsigned short proto, __wsum sum) |
| { |
| unsigned long tmp, tmp2; |
| |
| asm(" addcc %2,%0,%0,icc0 \n" |
| |
| /* add up the source addr */ |
| " ldi @(%3,0),%1 \n" |
| " addxcc %1,%0,%0,icc0 \n" |
| " ldi @(%3,4),%2 \n" |
| " addxcc %2,%0,%0,icc0 \n" |
| " ldi @(%3,8),%1 \n" |
| " addxcc %1,%0,%0,icc0 \n" |
| " ldi @(%3,12),%2 \n" |
| " addxcc %2,%0,%0,icc0 \n" |
| |
| /* add up the dest addr */ |
| " ldi @(%4,0),%1 \n" |
| " addxcc %1,%0,%0,icc0 \n" |
| " ldi @(%4,4),%2 \n" |
| " addxcc %2,%0,%0,icc0 \n" |
| " ldi @(%4,8),%1 \n" |
| " addxcc %1,%0,%0,icc0 \n" |
| " ldi @(%4,12),%2 \n" |
| " addxcc %2,%0,%0,icc0 \n" |
| |
| /* fold the 33-bit result into 16-bits */ |
| " addxcc gr0,%0,%0,icc0 \n" |
| " srli %0,#16,%1 \n" |
| " sethi #0,%0 \n" |
| " add %1,%0,%0 \n" |
| " srli %0,#16,%1 \n" |
| " add %1,%0,%0 \n" |
| |
| : "=r" (sum), "=&r" (tmp), "=r" (tmp2) |
| : "r" (saddr), "r" (daddr), "0" (sum), "2" (len + proto) |
| : "icc0" |
| ); |
| |
| return (__force __sum16)~sum; |
| } |
| |
| #endif /* _ASM_CHECKSUM_H */ |