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.
152 lines
3.7 KiB
152 lines
3.7 KiB
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __ASM_AVR32_CHECKSUM_H
|
|
#define __ASM_AVR32_CHECKSUM_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, 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
|
|
*/
|
|
__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
|
|
* verify_area().
|
|
*/
|
|
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((const void __force *)src, dst, len,
|
|
sum, err_ptr, NULL);
|
|
}
|
|
|
|
/*
|
|
* 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 sum, tmp;
|
|
|
|
__asm__ __volatile__(
|
|
" ld.w %0, %1++\n"
|
|
" ld.w %3, %1++\n"
|
|
" sub %2, 4\n"
|
|
" add %0, %3\n"
|
|
" ld.w %3, %1++\n"
|
|
" adc %0, %0, %3\n"
|
|
" ld.w %3, %1++\n"
|
|
" adc %0, %0, %3\n"
|
|
" acr %0\n"
|
|
"1: ld.w %3, %1++\n"
|
|
" add %0, %3\n"
|
|
" acr %0\n"
|
|
" sub %2, 1\n"
|
|
" brne 1b\n"
|
|
" lsl %3, %0, 16\n"
|
|
" andl %0, 0\n"
|
|
" mov %2, 0xffff\n"
|
|
" add %0, %3\n"
|
|
" adc %0, %0, %2\n"
|
|
" com %0\n"
|
|
" lsr %0, 16\n"
|
|
: "=r"(sum), "=r"(iph), "=r"(ihl), "=r"(tmp)
|
|
: "1"(iph), "2"(ihl)
|
|
: "memory", "cc");
|
|
return (__force __sum16)sum;
|
|
}
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*/
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
asm(" bfextu %1, %0, 0, 16\n"
|
|
" lsr %0, 16\n"
|
|
" add %0, %1\n"
|
|
" bfextu %1, %0, 16, 16\n"
|
|
" add %0, %1"
|
|
: "=&r"(sum), "=&r"(tmp)
|
|
: "0"(sum));
|
|
|
|
return (__force __sum16)~sum;
|
|
}
|
|
|
|
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
asm(" add %0, %1\n"
|
|
" adc %0, %0, %2\n"
|
|
" adc %0, %0, %3\n"
|
|
" acr %0"
|
|
: "=r"(sum)
|
|
: "r"(daddr), "r"(saddr), "r"(len + proto),
|
|
"0"(sum)
|
|
: "cc");
|
|
|
|
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));
|
|
}
|
|
|
|
#endif /* __ASM_AVR32_CHECKSUM_H */
|
|
|