1 /* $Id: checksum.h,v 1.17.2.1 2002/03/01 11:40:54 davem Exp $ */
2 #ifndef __SPARC64_CHECKSUM_H
3 #define __SPARC64_CHECKSUM_H
4
5 /* checksum.h: IP/UDP/TCP checksum routines on the V9.
6 *
7 * Copyright(C) 1995 Linus Torvalds
8 * Copyright(C) 1995 Miguel de Icaza
9 * Copyright(C) 1996 David S. Miller
10 * Copyright(C) 1996 Eddie C. Dost
11 * Copyright(C) 1997 Jakub Jelinek
12 *
13 * derived from:
14 * Alpha checksum c-code
15 * ix86 inline assembly
16 * RFC1071 Computing the Internet Checksum
17 */
18
19 #include <linux/in6.h>
20 #include <asm/uaccess.h>
21
22 /* computes the checksum of a memory block at buff, length len,
23 * and adds in "sum" (32-bit)
24 *
25 * returns a 32-bit number suitable for feeding into itself
26 * or csum_tcpudp_magic
27 *
28 * this function must be called with even lengths, except
29 * for the last fragment, which may be odd
30 *
31 * it's best to have buff aligned on a 32-bit boundary
32 */
33 extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
34
35 /* the same as csum_partial, but copies from user space while it
36 * checksums
37 *
38 * here even more important to align src and dst on a 32-bit (or even
39 * better 64-bit) boundary
40 */
41 extern unsigned int csum_partial_copy_sparc64(const char *src, char *dst, int len, unsigned int sum);
42
43 extern __inline__ unsigned int
csum_partial_copy_nocheck(const char * src,char * dst,int len,unsigned int sum)44 csum_partial_copy_nocheck (const char *src, char *dst, int len,
45 unsigned int sum)
46 {
47 int ret;
48 unsigned char cur_ds = current->thread.current_ds.seg;
49 __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "i" (ASI_P));
50 ret = csum_partial_copy_sparc64(src, dst, len, sum);
51 __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" (cur_ds));
52 return ret;
53 }
54
55 extern __inline__ unsigned int
csum_partial_copy_from_user(const char * src,char * dst,int len,unsigned int sum,int * err)56 csum_partial_copy_from_user(const char *src, char *dst, int len,
57 unsigned int sum, int *err)
58 {
59 __asm__ __volatile__ ("stx %0, [%%sp + 0x7ff + 128]"
60 : : "r" (err));
61 return csum_partial_copy_sparc64(src, dst, len, sum);
62 }
63
64 /*
65 * Copy and checksum to user
66 */
67 #define HAVE_CSUM_COPY_USER
68 extern unsigned int csum_partial_copy_user_sparc64(const char *src, char *dst, int len, unsigned int sum);
69 extern __inline__ unsigned int
csum_and_copy_to_user(const char * src,char * dst,int len,unsigned int sum,int * err)70 csum_and_copy_to_user(const char *src, char *dst, int len,
71 unsigned int sum, int *err)
72 {
73 __asm__ __volatile__ ("stx %0, [%%sp + 0x7ff + 128]"
74 : : "r" (err));
75 return csum_partial_copy_user_sparc64(src, dst, len, sum);
76 }
77
78 /* ihl is always 5 or greater, almost always is 5, and iph is word aligned
79 * the majority of the time.
80 */
ip_fast_csum(__const__ unsigned char * iph,unsigned int ihl)81 extern __inline__ unsigned short ip_fast_csum(__const__ unsigned char *iph,
82 unsigned int ihl)
83 {
84 unsigned short sum;
85
86 /* Note: We must read %2 before we touch %0 for the first time,
87 * because GCC can legitimately use the same register for
88 * both operands.
89 */
90 __asm__ __volatile__(
91 " sub %2, 4, %%g7 ! IEU0\n"
92 " lduw [%1 + 0x00], %0 ! Load Group\n"
93 " lduw [%1 + 0x04], %%g2 ! Load Group\n"
94 " lduw [%1 + 0x08], %%g3 ! Load Group\n"
95 " addcc %%g2, %0, %0 ! IEU1 1 Load Bubble + Group\n"
96 " lduw [%1 + 0x0c], %%g2 ! Load\n"
97 " addccc %%g3, %0, %0 ! Sngle Group no Bubble\n"
98 " lduw [%1 + 0x10], %%g3 ! Load Group\n"
99 " addccc %%g2, %0, %0 ! Sngle Group no Bubble\n"
100 " addc %0, %%g0, %0 ! Sngle Group\n"
101 "1: addcc %%g3, %0, %0 ! IEU1 Group no Bubble\n"
102 " add %1, 4, %1 ! IEU0\n"
103 " addccc %0, %%g0, %0 ! Sngle Group no Bubble\n"
104 " subcc %%g7, 1, %%g7 ! IEU1 Group\n"
105 " be,a,pt %%icc, 2f ! CTI\n"
106 " sll %0, 16, %%g2 ! IEU0\n"
107 " lduw [%1 + 0x10], %%g3 ! Load Group\n"
108 " ba,pt %%xcc, 1b ! CTI\n"
109 " nop ! IEU0\n"
110 "2: addcc %0, %%g2, %%g2 ! IEU1 Group\n"
111 " srl %%g2, 16, %0 ! IEU0 Group regdep XXX Scheisse!\n"
112 " addc %0, %%g0, %0 ! Sngle Group\n"
113 " xnor %%g0, %0, %0 ! IEU0 Group\n"
114 " srl %0, 0, %0 ! IEU0 Group XXX Scheisse!\n"
115 : "=r" (sum), "=&r" (iph)
116 : "r" (ihl), "1" (iph)
117 : "g2", "g3", "g7", "cc");
118 return sum;
119 }
120
121 /* Fold a partial checksum without adding pseudo headers. */
csum_fold(unsigned int sum)122 extern __inline__ unsigned short csum_fold(unsigned int sum)
123 {
124 unsigned int tmp;
125
126 __asm__ __volatile__(
127 " addcc %0, %1, %1\n"
128 " srl %1, 16, %1\n"
129 " addc %1, %%g0, %1\n"
130 " xnor %%g0, %1, %0\n"
131 : "=&r" (sum), "=r" (tmp)
132 : "0" (sum), "1" (sum<<16)
133 : "cc");
134 return (sum & 0xffff);
135 }
136
csum_tcpudp_nofold(unsigned long saddr,unsigned long daddr,unsigned int len,unsigned short proto,unsigned int sum)137 extern __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
138 unsigned long daddr,
139 unsigned int len,
140 unsigned short proto,
141 unsigned int sum)
142 {
143 __asm__ __volatile__(
144 " addcc %1, %0, %0\n"
145 " addccc %2, %0, %0\n"
146 " addccc %3, %0, %0\n"
147 " addc %0, %%g0, %0\n"
148 : "=r" (sum), "=r" (saddr)
149 : "r" (daddr), "r" ((proto<<16)+len), "0" (sum), "1" (saddr)
150 : "cc");
151 return sum;
152 }
153
154 /*
155 * computes the checksum of the TCP/UDP pseudo-header
156 * returns a 16-bit checksum, already complemented
157 */
csum_tcpudp_magic(unsigned long saddr,unsigned long daddr,unsigned short len,unsigned short proto,unsigned int sum)158 static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
159 unsigned long daddr,
160 unsigned short len,
161 unsigned short proto,
162 unsigned int sum)
163 {
164 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
165 }
166
167 #define _HAVE_ARCH_IPV6_CSUM
168
csum_ipv6_magic(struct in6_addr * saddr,struct in6_addr * daddr,__u32 len,unsigned short proto,unsigned int sum)169 static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
170 struct in6_addr *daddr,
171 __u32 len,
172 unsigned short proto,
173 unsigned int sum)
174 {
175 __asm__ __volatile__ (
176 " addcc %3, %4, %%g7\n"
177 " addccc %5, %%g7, %%g7\n"
178 " lduw [%2 + 0x0c], %%g2\n"
179 " lduw [%2 + 0x08], %%g3\n"
180 " addccc %%g2, %%g7, %%g7\n"
181 " lduw [%2 + 0x04], %%g2\n"
182 " addccc %%g3, %%g7, %%g7\n"
183 " lduw [%2 + 0x00], %%g3\n"
184 " addccc %%g2, %%g7, %%g7\n"
185 " lduw [%1 + 0x0c], %%g2\n"
186 " addccc %%g3, %%g7, %%g7\n"
187 " lduw [%1 + 0x08], %%g3\n"
188 " addccc %%g2, %%g7, %%g7\n"
189 " lduw [%1 + 0x04], %%g2\n"
190 " addccc %%g3, %%g7, %%g7\n"
191 " lduw [%1 + 0x00], %%g3\n"
192 " addccc %%g2, %%g7, %%g7\n"
193 " addccc %%g3, %%g7, %0\n"
194 " addc 0, %0, %0\n"
195 : "=&r" (sum)
196 : "r" (saddr), "r" (daddr), "r"(htonl(len)),
197 "r"(htonl(proto)), "r"(sum)
198 : "g2", "g3", "g7", "cc");
199
200 return csum_fold(sum);
201 }
202
203 /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
ip_compute_csum(unsigned char * buff,int len)204 extern __inline__ unsigned short ip_compute_csum(unsigned char * buff, int len)
205 {
206 return csum_fold(csum_partial(buff, len, 0));
207 }
208
209 #endif /* !(__SPARC64_CHECKSUM_H) */
210