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150 lines
3.4 KiB
150 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _M68K_CHECKSUM_H |
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#define _M68K_CHECKSUM_H |
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#include <linux/in6.h> |
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#ifdef CONFIG_GENERIC_CSUM |
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#include <asm-generic/checksum.h> |
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#else |
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/* |
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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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* |
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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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* |
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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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* |
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* it's best to have buff aligned on a 32-bit boundary |
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*/ |
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__wsum csum_partial(const void *buff, int len, __wsum sum); |
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/* |
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* the same as csum_partial, but copies from src while it |
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* checksums |
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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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* better 64-bit) boundary |
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*/ |
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#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
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#define _HAVE_ARCH_CSUM_AND_COPY |
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extern __wsum csum_and_copy_from_user(const void __user *src, |
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void *dst, |
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int len); |
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extern __wsum csum_partial_copy_nocheck(const void *src, |
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void *dst, int len); |
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/* |
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* This is a version of ip_fast_csum() optimized for IP headers, |
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* which always checksum on 4 octet boundaries. |
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*/ |
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
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{ |
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unsigned int sum = 0; |
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unsigned long tmp; |
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__asm__ ("subqw #1,%2\n" |
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"1:\t" |
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"movel %1@+,%3\n\t" |
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"addxl %3,%0\n\t" |
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"dbra %2,1b\n\t" |
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"movel %0,%3\n\t" |
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"swap %3\n\t" |
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"addxw %3,%0\n\t" |
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"clrw %3\n\t" |
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"addxw %3,%0\n\t" |
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: "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) |
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: "0" (sum), "1" (iph), "2" (ihl) |
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: "memory"); |
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return (__force __sum16)~sum; |
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} |
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static inline __sum16 csum_fold(__wsum sum) |
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{ |
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unsigned int tmp = (__force u32)sum; |
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__asm__("swap %1\n\t" |
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"addw %1, %0\n\t" |
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"clrw %1\n\t" |
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"addxw %1, %0" |
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: "=&d" (sum), "=&d" (tmp) |
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: "0" (sum), "1" (tmp)); |
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return (__force __sum16)~sum; |
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} |
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static inline __wsum |
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, |
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unsigned short proto, __wsum sum) |
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{ |
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__asm__ ("addl %2,%0\n\t" |
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"addxl %3,%0\n\t" |
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"addxl %4,%0\n\t" |
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"clrl %1\n\t" |
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"addxl %1,%0" |
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: "=&d" (sum), "=d" (saddr) |
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: "g" (daddr), "1" (saddr), "d" (len + proto), |
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"0" (sum)); |
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return sum; |
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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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* returns a 16-bit checksum, already complemented |
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*/ |
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static inline __sum16 |
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csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, |
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unsigned short proto, __wsum sum) |
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{ |
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return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); |
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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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* in icmp.c |
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*/ |
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static inline __sum16 ip_compute_csum(const void *buff, int len) |
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{ |
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return csum_fold (csum_partial(buff, len, 0)); |
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} |
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#define _HAVE_ARCH_IPV6_CSUM |
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static __inline__ __sum16 |
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csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, |
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__u32 len, __u8 proto, __wsum sum) |
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{ |
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register unsigned long tmp; |
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__asm__("addl %2@,%0\n\t" |
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"movel %2@(4),%1\n\t" |
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"addxl %1,%0\n\t" |
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"movel %2@(8),%1\n\t" |
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"addxl %1,%0\n\t" |
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"movel %2@(12),%1\n\t" |
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"addxl %1,%0\n\t" |
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"movel %3@,%1\n\t" |
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"addxl %1,%0\n\t" |
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"movel %3@(4),%1\n\t" |
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"addxl %1,%0\n\t" |
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"movel %3@(8),%1\n\t" |
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"addxl %1,%0\n\t" |
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"movel %3@(12),%1\n\t" |
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"addxl %1,%0\n\t" |
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"addxl %4,%0\n\t" |
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"clrl %1\n\t" |
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"addxl %1,%0" |
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: "=&d" (sum), "=&d" (tmp) |
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: "a" (saddr), "a" (daddr), "d" (len + proto), |
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"0" (sum)); |
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return csum_fold(sum); |
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} |
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#endif /* CONFIG_GENERIC_CSUM */ |
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#endif /* _M68K_CHECKSUM_H */
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