From fcfdd0f14f94d47f2f650a24cd111e11475ccada Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Sun, 11 Nov 2007 17:36:13 +0900 Subject: sh: Split out checksum.h in to _32 and _64 variants. Signed-off-by: Paul Mundt --- include/asm-sh/checksum_64.h | 80 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 include/asm-sh/checksum_64.h (limited to 'include/asm-sh/checksum_64.h') diff --git a/include/asm-sh/checksum_64.h b/include/asm-sh/checksum_64.h new file mode 100644 index 00000000000..ec79b92e6bd --- /dev/null +++ b/include/asm-sh/checksum_64.h @@ -0,0 +1,80 @@ +#ifndef __ASM_SH64_CHECKSUM_H +#define __ASM_SH64_CHECKSUM_H + +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * include/asm-sh64/checksum.h + * + * Copyright (C) 2000, 2001 Paolo Alberelli + * + */ + +/* + * 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 + */ +asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); + +/* + * Note: when you get a NULL pointer exception here this means someone + * passed in an incorrect kernel address to one of these functions. + * + * If you use these functions directly please don't forget the + * access_ok(). + */ + + +__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, + __wsum sum); + +__wsum csum_partial_copy_from_user(const void __user *src, void *dst, + int len, __wsum sum, int *err_ptr); + +static inline __sum16 csum_fold(__wsum csum) +{ + u32 sum = (__force u32)csum; + sum = (sum & 0xffff) + (sum >> 16); + sum = (sum & 0xffff) + (sum >> 16); + return (__force __sum16)~sum; +} + +__sum16 ip_fast_csum(const void *iph, unsigned int ihl); + +__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, + unsigned short len, unsigned short proto, + __wsum sum); + +/* + * computes the checksum of the TCP/UDP pseudo-header + * returns a 16-bit checksum, already complemented + */ +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 + */ +static inline __sum16 ip_compute_csum(const void *buff, int len) +{ + return csum_fold(csum_partial(buff, len, 0)); +} + +#endif /* __ASM_SH64_CHECKSUM_H */ + -- cgit v1.2.3