mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.7 KiB
70 lines
1.7 KiB
/* |
|
* Copyright (C) 2010 Tobias Klauser <[email protected]> |
|
* Copyright (C) 2004 Microtronix Datacom Ltd. |
|
* |
|
* 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. |
|
*/ |
|
|
|
#ifndef _ASM_NIOS_CHECKSUM_H |
|
#define _ASM_NIOS_CHECKSUM_H |
|
|
|
/* Take these from lib/checksum.c */ |
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
|
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
|
extern __sum16 ip_compute_csum(const void *buff, int len); |
|
|
|
/* |
|
* Fold a partial checksum |
|
*/ |
|
static inline __sum16 csum_fold(__wsum sum) |
|
{ |
|
__asm__ __volatile__( |
|
"add %0, %1, %0\n" |
|
"cmpltu r8, %0, %1\n" |
|
"srli %0, %0, 16\n" |
|
"add %0, %0, r8\n" |
|
"nor %0, %0, %0\n" |
|
: "=r" (sum) |
|
: "r" (sum << 16), "0" (sum) |
|
: "r8"); |
|
return (__force __sum16) sum; |
|
} |
|
|
|
/* |
|
* computes the checksum of the TCP/UDP pseudo-header |
|
* returns a 16-bit checksum, already complemented |
|
*/ |
|
#define csum_tcpudp_nofold csum_tcpudp_nofold |
|
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
|
__u32 len, __u8 proto, |
|
__wsum sum) |
|
{ |
|
__asm__ __volatile__( |
|
"add %0, %1, %0\n" |
|
"cmpltu r8, %0, %1\n" |
|
"add %0, %0, r8\n" /* add carry */ |
|
"add %0, %2, %0\n" |
|
"cmpltu r8, %0, %2\n" |
|
"add %0, %0, r8\n" /* add carry */ |
|
"add %0, %3, %0\n" |
|
"cmpltu r8, %0, %3\n" |
|
"add %0, %0, r8\n" /* add carry */ |
|
: "=r" (sum), "=r" (saddr) |
|
: "r" (daddr), "r" ((len + proto) << 8), |
|
"0" (sum), |
|
"1" (saddr) |
|
: "r8"); |
|
|
|
return sum; |
|
} |
|
|
|
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
|
__u32 len, __u8 proto, |
|
__wsum sum) |
|
{ |
|
return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
|
} |
|
|
|
#endif /* _ASM_NIOS_CHECKSUM_H */
|
|
|