![Paul Mundt](/assets/img/avatar_default.png)
This follows the sparc changes a439fe51a1
.
Most of the moving about was done with Sam's directions at:
http://marc.info/?l=linux-sh&m=121724823706062&w=2
with subsequent hacking and fixups entirely my fault.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
216 lines
5.3 KiB
C
216 lines
5.3 KiB
C
#ifndef __ASM_SH_CHECKSUM_H
|
|
#define __ASM_SH_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.
|
|
*
|
|
* Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka
|
|
*/
|
|
|
|
#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, and handles user-space pointer exceptions correctly, when needed.
|
|
*
|
|
* here even more important to align src and dst on a 32-bit (or even
|
|
* better 64-bit) boundary
|
|
*/
|
|
|
|
asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
|
|
int len, __wsum sum,
|
|
int *src_err_ptr, int *dst_err_ptr);
|
|
|
|
/*
|
|
* 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().
|
|
*/
|
|
static inline
|
|
__wsum csum_partial_copy_nocheck(const void *src, void *dst,
|
|
int len, __wsum sum)
|
|
{
|
|
return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
|
|
}
|
|
|
|
static inline
|
|
__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
|
|
int len, __wsum sum, int *err_ptr)
|
|
{
|
|
return csum_partial_copy_generic((__force const void *)src, dst,
|
|
len, sum, err_ptr, NULL);
|
|
}
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*/
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
unsigned int __dummy;
|
|
__asm__("swap.w %0, %1\n\t"
|
|
"extu.w %0, %0\n\t"
|
|
"extu.w %1, %1\n\t"
|
|
"add %1, %0\n\t"
|
|
"swap.w %0, %1\n\t"
|
|
"add %1, %0\n\t"
|
|
"not %0, %0\n\t"
|
|
: "=r" (sum), "=&r" (__dummy)
|
|
: "0" (sum)
|
|
: "t");
|
|
return (__force __sum16)sum;
|
|
}
|
|
|
|
/*
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
|
* which always checksum on 4 octet boundaries.
|
|
*
|
|
* i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
|
|
* for linux by * Arnt Gulbrandsen.
|
|
*/
|
|
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
|
|
{
|
|
unsigned int sum, __dummy0, __dummy1;
|
|
|
|
__asm__ __volatile__(
|
|
"mov.l @%1+, %0\n\t"
|
|
"mov.l @%1+, %3\n\t"
|
|
"add #-2, %2\n\t"
|
|
"clrt\n\t"
|
|
"1:\t"
|
|
"addc %3, %0\n\t"
|
|
"movt %4\n\t"
|
|
"mov.l @%1+, %3\n\t"
|
|
"dt %2\n\t"
|
|
"bf/s 1b\n\t"
|
|
" cmp/eq #1, %4\n\t"
|
|
"addc %3, %0\n\t"
|
|
"addc %2, %0" /* Here %2 is 0, add carry-bit */
|
|
/* 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" (__dummy0), "=&z" (__dummy1)
|
|
: "1" (iph), "2" (ihl)
|
|
: "t", "memory");
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
#ifdef __LITTLE_ENDIAN__
|
|
unsigned long len_proto = (proto + len) << 8;
|
|
#else
|
|
unsigned long len_proto = proto + len;
|
|
#endif
|
|
__asm__("clrt\n\t"
|
|
"addc %0, %1\n\t"
|
|
"addc %2, %1\n\t"
|
|
"addc %3, %1\n\t"
|
|
"movt %0\n\t"
|
|
"add %1, %0"
|
|
: "=r" (sum), "=r" (len_proto)
|
|
: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)
|
|
: "t");
|
|
|
|
return 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));
|
|
}
|
|
|
|
#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 int __dummy;
|
|
__asm__("clrt\n\t"
|
|
"mov.l @(0,%2), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(4,%2), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(8,%2), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(12,%2), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(0,%3), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(4,%3), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(8,%3), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"mov.l @(12,%3), %1\n\t"
|
|
"addc %1, %0\n\t"
|
|
"addc %4, %0\n\t"
|
|
"addc %5, %0\n\t"
|
|
"movt %1\n\t"
|
|
"add %1, %0\n"
|
|
: "=r" (sum), "=&r" (__dummy)
|
|
: "r" (saddr), "r" (daddr),
|
|
"r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
|
|
: "t");
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
/*
|
|
* Copy and checksum to user
|
|
*/
|
|
#define HAVE_CSUM_COPY_USER
|
|
static inline __wsum csum_and_copy_to_user(const void *src,
|
|
void __user *dst,
|
|
int len, __wsum sum,
|
|
int *err_ptr)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, dst, len))
|
|
return csum_partial_copy_generic((__force const void *)src,
|
|
dst, len, sum, NULL, err_ptr);
|
|
|
|
if (len)
|
|
*err_ptr = -EFAULT;
|
|
|
|
return (__force __wsum)-1; /* invalid checksum */
|
|
}
|
|
#endif /* __ASM_SH_CHECKSUM_H */
|