Release 4.14 arch/m32r/include/asm/checksum.h
#ifdef __KERNEL__
#ifndef _ASM_M32R_CHECKSUM_H
#define _ASM_M32R_CHECKSUM_H
/*
* include/asm-m32r/checksum.h
*
* IP/TCP/UDP checksum routines
*
* 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.
*
* Some code taken from mips and parisc architecture.
*
* Copyright (C) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
*/
#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
*/
asmlinkage __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
*/
extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum);
/*
* This is a new version of the above that records errors it finds in *errp,
* but continues and zeros thre rest of the buffer.
*/
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum,
int *err_ptr);
/*
* Fold a partial checksum
*/
static inline __sum16 csum_fold(__wsum sum)
{
unsigned long tmpreg;
__asm__(
" sll3 %1, %0, #16 \n"
" cmp %0, %0 \n"
" addx %0, %1 \n"
" ldi %1, #0 \n"
" srli %0, #16 \n"
" addx %0, %1 \n"
" xor3 %0, %0, #0x0000ffff \n"
: "=r" (sum), "=&r" (tmpreg)
: "0" (sum)
: "cbit"
);
return (__force __sum16)sum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 16 | 72.73% | 2 | 66.67% |
| Al Viro | 6 | 27.27% | 1 | 33.33% |
| Total | 22 | 100.00% | 3 | 100.00% |
/*
* 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 long tmpreg0, tmpreg1;
__wsum sum;
__asm__ __volatile__(
" ld %0, @%1+ \n"
" addi %2, #-4 \n"
"# bgez %2, 2f \n"
" cmp %0, %0 \n"
" ld %3, @%1+ \n"
" ld %4, @%1+ \n"
" addx %0, %3 \n"
" ld %3, @%1+ \n"
" addx %0, %4 \n"
" addx %0, %3 \n"
" .fillinsn\n"
"1: \n"
" ld %4, @%1+ \n"
" addi %2, #-1 \n"
" addx %0, %4 \n"
" bgtz %2, 1b \n"
"\n"
" ldi %3, #0 \n"
" addx %0, %3 \n"
" .fillinsn\n"
"2: \n"
/* Since the input registers which are loaded with iph and ihl
are modified, we must also specify them as outputs, or gcc
will assume they contain their original values. */
: "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1)
: "1" (iph), "2" (ihl)
: "cbit", "memory");
return csum_fold(sum);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 29 | 80.56% | 2 | 50.00% |
| Al Viro | 6 | 16.67% | 1 | 25.00% |
| Thomas Graf | 1 | 2.78% | 1 | 25.00% |
| Total | 36 | 100.00% | 4 | 100.00% |
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto,
__wsum sum)
{
#if defined(__LITTLE_ENDIAN)
unsigned long len_proto = (proto + len) << 8;
#else
unsigned long len_proto = proto + len;
#endif
unsigned long tmpreg;
__asm__(
" cmp %0, %0 \n"
" addx %0, %2 \n"
" addx %0, %3 \n"
" addx %0, %4 \n"
" ldi %1, #0 \n"
" addx %0, %1 \n"
: "=r" (sum), "=&r" (tmpreg)
: "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum)
: "cbit"
);
return sum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 50 | 83.33% | 2 | 50.00% |
| Al Viro | 8 | 13.33% | 1 | 25.00% |
| Alexander Duyck | 2 | 3.33% | 1 | 25.00% |
| Total | 60 | 100.00% | 4 | 100.00% |
/*
* 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,
__u32 len, __u8 proto,
__wsum sum)
{
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 33 | 84.62% | 2 | 50.00% |
| Al Viro | 4 | 10.26% | 1 | 25.00% |
| Alexander Duyck | 2 | 5.13% | 1 | 25.00% |
| Total | 39 | 100.00% | 4 | 100.00% |
/*
* 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));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 25 | 89.29% | 2 | 66.67% |
| Al Viro | 3 | 10.71% | 1 | 33.33% |
| Total | 28 | 100.00% | 3 | 100.00% |
#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 tmpreg0, tmpreg1, tmpreg2, tmpreg3;
__asm__(
" ld %1, @(%5) \n"
" ld %2, @(4,%5) \n"
" ld %3, @(8,%5) \n"
" ld %4, @(12,%5) \n"
" add %0, %1 \n"
" addx %0, %2 \n"
" addx %0, %3 \n"
" addx %0, %4 \n"
" ld %1, @(%6) \n"
" ld %2, @(4,%6) \n"
" ld %3, @(8,%6) \n"
" ld %4, @(12,%6) \n"
" addx %0, %1 \n"
" addx %0, %2 \n"
" addx %0, %3 \n"
" addx %0, %4 \n"
" addx %0, %7 \n"
" addx %0, %8 \n"
" ldi %1, #0 \n"
" addx %0, %1 \n"
: "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
"=&r" (tmpreg2), "=&r" (tmpreg3)
: "r" (saddr), "r" (daddr),
"r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
: "cbit"
);
return csum_fold(sum);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 40 | 86.96% | 2 | 66.67% |
| Al Viro | 6 | 13.04% | 1 | 33.33% |
| Total | 46 | 100.00% | 3 | 100.00% |
#endif /* _ASM_M32R_CHECKSUM_H */
#endif /* __KERNEL__ */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Hirokazu Takata | 272 | 84.74% | 3 | 50.00% |
| Al Viro | 44 | 13.71% | 1 | 16.67% |
| Alexander Duyck | 4 | 1.25% | 1 | 16.67% |
| Thomas Graf | 1 | 0.31% | 1 | 16.67% |
| Total | 321 | 100.00% | 6 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.