#ifndef _M68K_CHECKSUM_H
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#ifndef _M68K_CHECKSUM_H
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#define _M68K_CHECKSUM_H
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#define _M68K_CHECKSUM_H
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#include <linux/config.h>
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#include <linux/config.h>
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/*
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/*
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* computes the checksum of a memory block at buff, length len,
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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* and adds in "sum" (32-bit)
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*
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*
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* returns a 32-bit number suitable for feeding into itself
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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* or csum_tcpudp_magic
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*
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*
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* this function must be called with even lengths, except
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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* for the last fragment, which may be odd
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*
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*
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* it's best to have buff aligned on a 32-bit boundary
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* it's best to have buff aligned on a 32-bit boundary
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*/
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*/
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unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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/*
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/*
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* the same as csum_partial_copy, but copies from src while it
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* the same as csum_partial_copy, but copies from src while it
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* checksums
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* checksums
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*
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*
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* here even more important to align src and dst on a 32-bit (or even
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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* better 64-bit) boundary
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*/
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*/
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unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
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unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
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/*
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/*
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* the same as csum_partial_copy, but copies from user space.
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* the same as csum_partial_copy, but copies from user space.
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*
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*
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* here even more important to align src and dst on a 32-bit (or even
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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* better 64-bit) boundary
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*/
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*/
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unsigned int csum_partial_copy_fromuser(const char *src, char *dst, int len, int sum);
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unsigned int csum_partial_copy_fromuser(const char *src, char *dst, int len, int sum);
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unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
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unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
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#ifdef BLASTED_MOTOROLA_CODE
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#ifdef BLASTED_MOTOROLA_CODE
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/*
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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* which always checksum on 4 octet boundaries.
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*
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*
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*/
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*/
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static inline unsigned short
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static inline unsigned short
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ip_fast_csum(unsigned char *iph, unsigned int ihl)
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ip_fast_csum(unsigned char *iph, unsigned int ihl)
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{
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{
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unsigned int sum = 0;
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unsigned int sum = 0;
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__asm__ ("subqw #1,%2\n"
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__asm__ ("subqw #1,%2\n"
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"1:\t"
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"1:\t"
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"movel %1@+,%/d0\n\t"
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"movel %1@+,%/d0\n\t"
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"addxl %/d0,%0\n\t"
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"addxl %/d0,%0\n\t"
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"dbra %2,1b\n\t"
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"dbra %2,1b\n\t"
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"movel %0,%/d0\n\t"
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"movel %0,%/d0\n\t"
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"swap %/d0\n\t"
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"swap %/d0\n\t"
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"addxw %/d0,%0\n\t"
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"addxw %/d0,%0\n\t"
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"clrw %/d0\n\t"
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"clrw %/d0\n\t"
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"addxw %/d0,%0\n\t"
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"addxw %/d0,%0\n\t"
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: "=d" (sum), "=a" (iph), "=d" (ihl)
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: "=d" (sum), "=a" (iph), "=d" (ihl)
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: "0" (sum), "1" (iph), "2" (ihl)
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: "0" (sum), "1" (iph), "2" (ihl)
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: "d0");
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: "d0");
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return ~sum;
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return ~sum;
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}
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}
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#endif
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#endif
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/*
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/*
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* Fold a partial checksum
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* Fold a partial checksum
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*/
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*/
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static inline unsigned int csum_fold(unsigned int sum)
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static inline unsigned int csum_fold(unsigned int sum)
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{
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{
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#ifdef CONFIG_COLDFIRE
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#ifdef CONFIG_COLDFIRE
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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#else
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#else
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unsigned int tmp = sum;
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unsigned int tmp = sum;
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__asm__("swap %1\n\t"
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__asm__("swap %1\n\t"
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"addw %1, %0\n\t"
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"addw %1, %0\n\t"
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"clrw %1\n\t"
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"clrw %1\n\t"
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"addxw %1, %0"
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"addxw %1, %0"
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: "=&d" (sum), "=&d" (tmp)
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: "=&d" (sum), "=&d" (tmp)
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: "0" (sum), "1" (sum));
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: "0" (sum), "1" (sum));
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#endif
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#endif
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return ~sum;
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return ~sum;
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}
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}
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/*
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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* returns a 16-bit checksum, already complemented
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*/
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*/
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static inline unsigned short int
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static inline unsigned short int
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csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
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csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
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unsigned short proto, unsigned int sum)
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unsigned short proto, unsigned int sum)
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{
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{
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__asm__ ("addl %1,%0\n\t"
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__asm__ ("addl %1,%0\n\t"
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"addxl %4,%0\n\t"
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"addxl %4,%0\n\t"
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"addxl %5,%0\n\t"
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"addxl %5,%0\n\t"
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"clrl %1\n\t"
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"clrl %1\n\t"
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"addxl %1,%0"
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"addxl %1,%0"
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: "=&d" (sum), "=&d" (saddr)
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: "=&d" (sum), "=&d" (saddr)
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: "0" (daddr), "1" (saddr), "d" (len + proto),
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: "0" (daddr), "1" (saddr), "d" (len + proto),
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"d"(sum));
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"d"(sum));
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return csum_fold(sum);
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return csum_fold(sum);
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}
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}
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/*
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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* in icmp.c
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*/
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*/
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#ifdef BLASTED_MOTOROLA_CODE
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#ifdef BLASTED_MOTOROLA_CODE
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static inline unsigned short
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static inline unsigned short
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ip_compute_csum(unsigned char * buff, int len)
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ip_compute_csum(unsigned char * buff, int len)
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{
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{
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return csum_fold (csum_partial(buff, len, 0));
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return csum_fold (csum_partial(buff, len, 0));
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}
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}
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#else
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#else
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extern unsigned short
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extern unsigned short
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ip_compute_csum(const unsigned char * buff, int len);
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ip_compute_csum(const unsigned char * buff, int len);
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#endif
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#endif
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#endif /* _M68K_CHECKSUM_H */
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#endif /* _M68K_CHECKSUM_H */
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