fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sparc64 / checksum.h
blob70a006da7634ab10c9f5b625977aa02270cd02f5
1 /* $Id: checksum.h,v 1.19 2002/02/09 19:49:31 davem Exp $ */
2 #ifndef __SPARC64_CHECKSUM_H
3 #define __SPARC64_CHECKSUM_H
5 /* checksum.h: IP/UDP/TCP checksum routines on the V9.
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
13 * derived from:
14 * Alpha checksum c-code
15 * ix86 inline assembly
16 * RFC1071 Computing the Internet Checksum
19 #include <linux/in6.h>
20 #include <asm/uaccess.h>
22 /* computes the checksum of a memory block at buff, length len,
23 * and adds in "sum" (32-bit)
25 * returns a 32-bit number suitable for feeding into itself
26 * or csum_tcpudp_magic
28 * this function must be called with even lengths, except
29 * for the last fragment, which may be odd
31 * it's best to have buff aligned on a 32-bit boundary
33 extern __wsum csum_partial(const void * buff, int len, __wsum sum);
35 /* the same as csum_partial, but copies from user space while it
36 * checksums
38 * here even more important to align src and dst on a 32-bit (or even
39 * better 64-bit) boundary
41 extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
42 int len, __wsum sum);
44 extern long __csum_partial_copy_from_user(const void __user *src,
45 void *dst, int len,
46 __wsum sum);
48 static inline __wsum
49 csum_partial_copy_from_user(const void __user *src,
50 void *dst, int len,
51 __wsum sum, int *err)
53 long ret = __csum_partial_copy_from_user(src, dst, len, sum);
54 if (ret < 0)
55 *err = -EFAULT;
56 return (__force __wsum) ret;
59 /*
60 * Copy and checksum to user
62 #define HAVE_CSUM_COPY_USER
63 extern long __csum_partial_copy_to_user(const void *src,
64 void __user *dst, int len,
65 __wsum sum);
67 static inline __wsum
68 csum_and_copy_to_user(const void *src,
69 void __user *dst, int len,
70 __wsum sum, int *err)
72 long ret = __csum_partial_copy_to_user(src, dst, len, sum);
73 if (ret < 0)
74 *err = -EFAULT;
75 return (__force __wsum) ret;
78 /* ihl is always 5 or greater, almost always is 5, and iph is word aligned
79 * the majority of the time.
81 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
83 /* Fold a partial checksum without adding pseudo headers. */
84 static inline __sum16 csum_fold(__wsum sum)
86 unsigned int tmp;
88 __asm__ __volatile__(
89 " addcc %0, %1, %1\n"
90 " srl %1, 16, %1\n"
91 " addc %1, %%g0, %1\n"
92 " xnor %%g0, %1, %0\n"
93 : "=&r" (sum), "=r" (tmp)
94 : "0" (sum), "1" ((__force u32)sum<<16)
95 : "cc");
96 return (__force __sum16)sum;
99 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
100 unsigned int len,
101 unsigned short proto,
102 __wsum sum)
104 __asm__ __volatile__(
105 " addcc %1, %0, %0\n"
106 " addccc %2, %0, %0\n"
107 " addccc %3, %0, %0\n"
108 " addc %0, %%g0, %0\n"
109 : "=r" (sum), "=r" (saddr)
110 : "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr)
111 : "cc");
112 return sum;
116 * computes the checksum of the TCP/UDP pseudo-header
117 * returns a 16-bit checksum, already complemented
119 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
120 unsigned short len,
121 unsigned short proto,
122 __wsum sum)
124 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
127 #define _HAVE_ARCH_IPV6_CSUM
129 static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
130 const struct in6_addr *daddr,
131 __u32 len, unsigned short proto,
132 __wsum sum)
134 __asm__ __volatile__ (
135 " addcc %3, %4, %%g7\n"
136 " addccc %5, %%g7, %%g7\n"
137 " lduw [%2 + 0x0c], %%g2\n"
138 " lduw [%2 + 0x08], %%g3\n"
139 " addccc %%g2, %%g7, %%g7\n"
140 " lduw [%2 + 0x04], %%g2\n"
141 " addccc %%g3, %%g7, %%g7\n"
142 " lduw [%2 + 0x00], %%g3\n"
143 " addccc %%g2, %%g7, %%g7\n"
144 " lduw [%1 + 0x0c], %%g2\n"
145 " addccc %%g3, %%g7, %%g7\n"
146 " lduw [%1 + 0x08], %%g3\n"
147 " addccc %%g2, %%g7, %%g7\n"
148 " lduw [%1 + 0x04], %%g2\n"
149 " addccc %%g3, %%g7, %%g7\n"
150 " lduw [%1 + 0x00], %%g3\n"
151 " addccc %%g2, %%g7, %%g7\n"
152 " addccc %%g3, %%g7, %0\n"
153 " addc 0, %0, %0\n"
154 : "=&r" (sum)
155 : "r" (saddr), "r" (daddr), "r"(htonl(len)),
156 "r"(htonl(proto)), "r"(sum)
157 : "g2", "g3", "g7", "cc");
159 return csum_fold(sum);
162 /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
163 static inline __sum16 ip_compute_csum(const void *buff, int len)
165 return csum_fold(csum_partial(buff, len, 0));
168 #endif /* !(__SPARC64_CHECKSUM_H) */