ia64/linux-2.6.18-xen.hg

view include/asm-h8300/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 _H8300_CHECKSUM_H
2 #define _H8300_CHECKSUM_H
4 /*
5 * computes the checksum of a memory block at buff, length len,
6 * and adds in "sum" (32-bit)
7 *
8 * returns a 32-bit number suitable for feeding into itself
9 * or csum_tcpudp_magic
10 *
11 * this function must be called with even lengths, except
12 * for the last fragment, which may be odd
13 *
14 * it's best to have buff aligned on a 32-bit boundary
15 */
16 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
18 /*
19 * the same as csum_partial, but copies from src while it
20 * checksums
21 *
22 * here even more important to align src and dst on a 32-bit (or even
23 * better 64-bit) boundary
24 */
26 unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
29 /*
30 * the same as csum_partial_copy, but copies from user space.
31 *
32 * here even more important to align src and dst on a 32-bit (or even
33 * better 64-bit) boundary
34 */
36 extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
37 int len, int sum, int *csum_err);
39 #define csum_partial_copy_nocheck(src, dst, len, sum) \
40 csum_partial_copy((src), (dst), (len), (sum))
42 unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
45 /*
46 * Fold a partial checksum
47 */
49 static inline unsigned int csum_fold(unsigned int sum)
50 {
51 __asm__("mov.l %0,er0\n\t"
52 "add.w e0,r0\n\t"
53 "xor.w e0,e0\n\t"
54 "rotxl.w e0\n\t"
55 "add.w e0,r0\n\t"
56 "sub.w e0,e0\n\t"
57 "mov.l er0,%0"
58 : "=r"(sum)
59 : "0"(sum)
60 : "er0");
61 return ~sum;
62 }
65 /*
66 * computes the checksum of the TCP/UDP pseudo-header
67 * returns a 16-bit checksum, already complemented
68 */
70 static inline unsigned int
71 csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
72 unsigned short proto, unsigned int sum)
73 {
74 __asm__ ("sub.l er0,er0\n\t"
75 "add.l %2,%0\n\t"
76 "addx #0,r0l\n\t"
77 "add.l %3,%0\n\t"
78 "addx #0,r0l\n\t"
79 "add.l %4,%0\n\t"
80 "addx #0,r0l\n\t"
81 "add.l er0,%0\n\t"
82 "bcc 1f\n\t"
83 "inc.l #1,%0\n"
84 "1:"
85 : "=&r" (sum)
86 : "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto)
87 :"er0");
88 return sum;
89 }
91 static inline unsigned short int
92 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
93 unsigned short proto, unsigned int sum)
94 {
95 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
96 }
98 /*
99 * this routine is used for miscellaneous IP-like checksums, mainly
100 * in icmp.c
101 */
103 extern unsigned short ip_compute_csum(const unsigned char * buff, int len);
105 #endif /* _H8300_CHECKSUM_H */