1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _M68K_CHECKSUM_H
3*4882a593Smuzhiyun #define _M68K_CHECKSUM_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/in6.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifdef CONFIG_GENERIC_CSUM
8*4882a593Smuzhiyun #include <asm-generic/checksum.h>
9*4882a593Smuzhiyun #else
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun /*
12*4882a593Smuzhiyun * computes the checksum of a memory block at buff, length len,
13*4882a593Smuzhiyun * and adds in "sum" (32-bit)
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun * returns a 32-bit number suitable for feeding into itself
16*4882a593Smuzhiyun * or csum_tcpudp_magic
17*4882a593Smuzhiyun *
18*4882a593Smuzhiyun * this function must be called with even lengths, except
19*4882a593Smuzhiyun * for the last fragment, which may be odd
20*4882a593Smuzhiyun *
21*4882a593Smuzhiyun * it's best to have buff aligned on a 32-bit boundary
22*4882a593Smuzhiyun */
23*4882a593Smuzhiyun __wsum csum_partial(const void *buff, int len, __wsum sum);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * the same as csum_partial, but copies from src while it
27*4882a593Smuzhiyun * checksums
28*4882a593Smuzhiyun *
29*4882a593Smuzhiyun * here even more important to align src and dst on a 32-bit (or even
30*4882a593Smuzhiyun * better 64-bit) boundary
31*4882a593Smuzhiyun */
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
34*4882a593Smuzhiyun #define _HAVE_ARCH_CSUM_AND_COPY
35*4882a593Smuzhiyun extern __wsum csum_and_copy_from_user(const void __user *src,
36*4882a593Smuzhiyun void *dst,
37*4882a593Smuzhiyun int len);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun extern __wsum csum_partial_copy_nocheck(const void *src,
40*4882a593Smuzhiyun void *dst, int len);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun /*
43*4882a593Smuzhiyun * This is a version of ip_fast_csum() optimized for IP headers,
44*4882a593Smuzhiyun * which always checksum on 4 octet boundaries.
45*4882a593Smuzhiyun */
ip_fast_csum(const void * iph,unsigned int ihl)46*4882a593Smuzhiyun static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun unsigned int sum = 0;
49*4882a593Smuzhiyun unsigned long tmp;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun __asm__ ("subqw #1,%2\n"
52*4882a593Smuzhiyun "1:\t"
53*4882a593Smuzhiyun "movel %1@+,%3\n\t"
54*4882a593Smuzhiyun "addxl %3,%0\n\t"
55*4882a593Smuzhiyun "dbra %2,1b\n\t"
56*4882a593Smuzhiyun "movel %0,%3\n\t"
57*4882a593Smuzhiyun "swap %3\n\t"
58*4882a593Smuzhiyun "addxw %3,%0\n\t"
59*4882a593Smuzhiyun "clrw %3\n\t"
60*4882a593Smuzhiyun "addxw %3,%0\n\t"
61*4882a593Smuzhiyun : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
62*4882a593Smuzhiyun : "0" (sum), "1" (iph), "2" (ihl)
63*4882a593Smuzhiyun : "memory");
64*4882a593Smuzhiyun return (__force __sum16)~sum;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
csum_fold(__wsum sum)67*4882a593Smuzhiyun static inline __sum16 csum_fold(__wsum sum)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun unsigned int tmp = (__force u32)sum;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun __asm__("swap %1\n\t"
72*4882a593Smuzhiyun "addw %1, %0\n\t"
73*4882a593Smuzhiyun "clrw %1\n\t"
74*4882a593Smuzhiyun "addxw %1, %0"
75*4882a593Smuzhiyun : "=&d" (sum), "=&d" (tmp)
76*4882a593Smuzhiyun : "0" (sum), "1" (tmp));
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return (__force __sum16)~sum;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun static inline __wsum
csum_tcpudp_nofold(__be32 saddr,__be32 daddr,unsigned short len,unsigned short proto,__wsum sum)82*4882a593Smuzhiyun csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
83*4882a593Smuzhiyun unsigned short proto, __wsum sum)
84*4882a593Smuzhiyun {
85*4882a593Smuzhiyun __asm__ ("addl %2,%0\n\t"
86*4882a593Smuzhiyun "addxl %3,%0\n\t"
87*4882a593Smuzhiyun "addxl %4,%0\n\t"
88*4882a593Smuzhiyun "clrl %1\n\t"
89*4882a593Smuzhiyun "addxl %1,%0"
90*4882a593Smuzhiyun : "=&d" (sum), "=d" (saddr)
91*4882a593Smuzhiyun : "g" (daddr), "1" (saddr), "d" (len + proto),
92*4882a593Smuzhiyun "0" (sum));
93*4882a593Smuzhiyun return sum;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun /*
98*4882a593Smuzhiyun * computes the checksum of the TCP/UDP pseudo-header
99*4882a593Smuzhiyun * returns a 16-bit checksum, already complemented
100*4882a593Smuzhiyun */
101*4882a593Smuzhiyun static inline __sum16
csum_tcpudp_magic(__be32 saddr,__be32 daddr,unsigned short len,unsigned short proto,__wsum sum)102*4882a593Smuzhiyun csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
103*4882a593Smuzhiyun unsigned short proto, __wsum sum)
104*4882a593Smuzhiyun {
105*4882a593Smuzhiyun return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
106*4882a593Smuzhiyun }
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun /*
109*4882a593Smuzhiyun * this routine is used for miscellaneous IP-like checksums, mainly
110*4882a593Smuzhiyun * in icmp.c
111*4882a593Smuzhiyun */
112*4882a593Smuzhiyun
ip_compute_csum(const void * buff,int len)113*4882a593Smuzhiyun static inline __sum16 ip_compute_csum(const void *buff, int len)
114*4882a593Smuzhiyun {
115*4882a593Smuzhiyun return csum_fold (csum_partial(buff, len, 0));
116*4882a593Smuzhiyun }
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun #define _HAVE_ARCH_IPV6_CSUM
119*4882a593Smuzhiyun static __inline__ __sum16
csum_ipv6_magic(const struct in6_addr * saddr,const struct in6_addr * daddr,__u32 len,__u8 proto,__wsum sum)120*4882a593Smuzhiyun csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
121*4882a593Smuzhiyun __u32 len, __u8 proto, __wsum sum)
122*4882a593Smuzhiyun {
123*4882a593Smuzhiyun register unsigned long tmp;
124*4882a593Smuzhiyun __asm__("addl %2@,%0\n\t"
125*4882a593Smuzhiyun "movel %2@(4),%1\n\t"
126*4882a593Smuzhiyun "addxl %1,%0\n\t"
127*4882a593Smuzhiyun "movel %2@(8),%1\n\t"
128*4882a593Smuzhiyun "addxl %1,%0\n\t"
129*4882a593Smuzhiyun "movel %2@(12),%1\n\t"
130*4882a593Smuzhiyun "addxl %1,%0\n\t"
131*4882a593Smuzhiyun "movel %3@,%1\n\t"
132*4882a593Smuzhiyun "addxl %1,%0\n\t"
133*4882a593Smuzhiyun "movel %3@(4),%1\n\t"
134*4882a593Smuzhiyun "addxl %1,%0\n\t"
135*4882a593Smuzhiyun "movel %3@(8),%1\n\t"
136*4882a593Smuzhiyun "addxl %1,%0\n\t"
137*4882a593Smuzhiyun "movel %3@(12),%1\n\t"
138*4882a593Smuzhiyun "addxl %1,%0\n\t"
139*4882a593Smuzhiyun "addxl %4,%0\n\t"
140*4882a593Smuzhiyun "clrl %1\n\t"
141*4882a593Smuzhiyun "addxl %1,%0"
142*4882a593Smuzhiyun : "=&d" (sum), "=&d" (tmp)
143*4882a593Smuzhiyun : "a" (saddr), "a" (daddr), "d" (len + proto),
144*4882a593Smuzhiyun "0" (sum));
145*4882a593Smuzhiyun
146*4882a593Smuzhiyun return csum_fold(sum);
147*4882a593Smuzhiyun }
148*4882a593Smuzhiyun
149*4882a593Smuzhiyun #endif /* CONFIG_GENERIC_CSUM */
150*4882a593Smuzhiyun #endif /* _M68K_CHECKSUM_H */
151