ia64/linux-2.6.18-xen.hg

view include/asm-m68k/checksum.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 #ifndef _M68K_CHECKSUM_H
2 #define _M68K_CHECKSUM_H
4 #include <linux/in6.h>
6 /*
7 * computes the checksum of a memory block at buff, length len,
8 * and adds in "sum" (32-bit)
9 *
10 * returns a 32-bit number suitable for feeding into itself
11 * or csum_tcpudp_magic
12 *
13 * this function must be called with even lengths, except
14 * for the last fragment, which may be odd
15 *
16 * it's best to have buff aligned on a 32-bit boundary
17 */
18 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
20 /*
21 * the same as csum_partial, but copies from src while it
22 * checksums
23 *
24 * here even more important to align src and dst on a 32-bit (or even
25 * better 64-bit) boundary
26 */
28 extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
29 unsigned char *dst,
30 int len, int sum,
31 int *csum_err);
33 extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
34 unsigned char *dst, int len,
35 int sum);
37 /*
38 * This is a version of ip_compute_csum() optimized for IP headers,
39 * which always checksum on 4 octet boundaries.
40 *
41 */
42 static inline unsigned short
43 ip_fast_csum(unsigned char *iph, unsigned int ihl)
44 {
45 unsigned int sum = 0;
46 unsigned long tmp;
48 __asm__ ("subqw #1,%2\n"
49 "1:\t"
50 "movel %1@+,%3\n\t"
51 "addxl %3,%0\n\t"
52 "dbra %2,1b\n\t"
53 "movel %0,%3\n\t"
54 "swap %3\n\t"
55 "addxw %3,%0\n\t"
56 "clrw %3\n\t"
57 "addxw %3,%0\n\t"
58 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
59 : "0" (sum), "1" (iph), "2" (ihl)
60 : "memory");
61 return ~sum;
62 }
64 /*
65 * Fold a partial checksum
66 */
68 static inline unsigned int csum_fold(unsigned int sum)
69 {
70 unsigned int tmp = sum;
71 __asm__("swap %1\n\t"
72 "addw %1, %0\n\t"
73 "clrw %1\n\t"
74 "addxw %1, %0"
75 : "=&d" (sum), "=&d" (tmp)
76 : "0" (sum), "1" (tmp));
77 return ~sum;
78 }
81 static inline unsigned int
82 csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
83 unsigned short proto, unsigned int sum)
84 {
85 __asm__ ("addl %2,%0\n\t"
86 "addxl %3,%0\n\t"
87 "addxl %4,%0\n\t"
88 "clrl %1\n\t"
89 "addxl %1,%0"
90 : "=&d" (sum), "=d" (saddr)
91 : "g" (daddr), "1" (saddr), "d" (len + proto),
92 "0" (sum));
93 return sum;
94 }
97 /*
98 * computes the checksum of the TCP/UDP pseudo-header
99 * returns a 16-bit checksum, already complemented
100 */
101 static inline unsigned short int
102 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
103 unsigned short proto, unsigned int sum)
104 {
105 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
106 }
108 /*
109 * this routine is used for miscellaneous IP-like checksums, mainly
110 * in icmp.c
111 */
113 static inline unsigned short
114 ip_compute_csum(unsigned char * buff, int len)
115 {
116 return csum_fold (csum_partial(buff, len, 0));
117 }
119 #define _HAVE_ARCH_IPV6_CSUM
120 static __inline__ unsigned short int
121 csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
122 __u32 len, unsigned short proto, unsigned int sum)
123 {
124 register unsigned long tmp;
125 __asm__("addl %2@,%0\n\t"
126 "movel %2@(4),%1\n\t"
127 "addxl %1,%0\n\t"
128 "movel %2@(8),%1\n\t"
129 "addxl %1,%0\n\t"
130 "movel %2@(12),%1\n\t"
131 "addxl %1,%0\n\t"
132 "movel %3@,%1\n\t"
133 "addxl %1,%0\n\t"
134 "movel %3@(4),%1\n\t"
135 "addxl %1,%0\n\t"
136 "movel %3@(8),%1\n\t"
137 "addxl %1,%0\n\t"
138 "movel %3@(12),%1\n\t"
139 "addxl %1,%0\n\t"
140 "addxl %4,%0\n\t"
141 "clrl %1\n\t"
142 "addxl %1,%0"
143 : "=&d" (sum), "=&d" (tmp)
144 : "a" (saddr), "a" (daddr), "d" (len + proto),
145 "0" (sum));
147 return csum_fold(sum);
148 }
150 #endif /* _M68K_CHECKSUM_H */