X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-sh%2Fchecksum.h;h=67496ab0ef0421c166fd9a33a56c7e1249c2d10a;hb=8df5fc042c8e7c08dc438c8198b62407ee1e91a0;hp=d44344c88e73b69c07d4d6417206f36dd1aea503;hpb=7c73a746ba726faa5ab12981b4b192768eb439de;p=linux-2.6-omap-h63xx.git diff --git a/include/asm-sh/checksum.h b/include/asm-sh/checksum.h index d44344c88e7..67496ab0ef0 100644 --- a/include/asm-sh/checksum.h +++ b/include/asm-sh/checksum.h @@ -1,216 +1,5 @@ -#ifndef __ASM_SH_CHECKSUM_H -#define __ASM_SH_CHECKSUM_H - -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka - */ - -#include - -/* - * computes the checksum of a memory block at buff, length len, - * and adds in "sum" (32-bit) - * - * returns a 32-bit number suitable for feeding into itself - * or csum_tcpudp_magic - * - * this function must be called with even lengths, except - * for the last fragment, which may be odd - * - * it's best to have buff aligned on a 32-bit boundary - */ -asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); - -/* - * the same as csum_partial, but copies from src while it - * checksums, and handles user-space pointer exceptions correctly, when needed. - * - * here even more important to align src and dst on a 32-bit (or even - * better 64-bit) boundary - */ - -asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst, - int len, __wsum sum, int *src_err_ptr, int *dst_err_ptr); - -/* - * Note: when you get a NULL pointer exception here this means someone - * passed in an incorrect kernel address to one of these functions. - * - * If you use these functions directly please don't forget the - * access_ok(). - */ -static __inline__ -__wsum csum_partial_copy_nocheck(const void *src, void *dst, - int len, __wsum sum) -{ - return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL); -} - -static __inline__ -__wsum csum_partial_copy_from_user(const void __user *src, void *dst, - int len, __wsum sum, int *err_ptr) -{ - return csum_partial_copy_generic((__force const void *)src, dst, - len, sum, err_ptr, NULL); -} - -/* - * Fold a partial checksum - */ - -static __inline__ __sum16 csum_fold(__wsum sum) -{ - unsigned int __dummy; - __asm__("swap.w %0, %1\n\t" - "extu.w %0, %0\n\t" - "extu.w %1, %1\n\t" - "add %1, %0\n\t" - "swap.w %0, %1\n\t" - "add %1, %0\n\t" - "not %0, %0\n\t" - : "=r" (sum), "=&r" (__dummy) - : "0" (sum) - : "t"); - return (__force __sum16)sum; -} - -/* - * This is a version of ip_compute_csum() optimized for IP headers, - * which always checksum on 4 octet boundaries. - * - * i386 version by Jorge Cwik , adapted - * for linux by * Arnt Gulbrandsen. - */ -static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl) -{ - unsigned int sum, __dummy0, __dummy1; - - __asm__ __volatile__( - "mov.l @%1+, %0\n\t" - "mov.l @%1+, %3\n\t" - "add #-2, %2\n\t" - "clrt\n\t" - "1:\t" - "addc %3, %0\n\t" - "movt %4\n\t" - "mov.l @%1+, %3\n\t" - "dt %2\n\t" - "bf/s 1b\n\t" - " cmp/eq #1, %4\n\t" - "addc %3, %0\n\t" - "addc %2, %0" /* Here %2 is 0, add carry-bit */ - /* Since the input registers which are loaded with iph and ihl - are modified, we must also specify them as outputs, or gcc - will assume they contain their original values. */ - : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (__dummy0), "=&z" (__dummy1) - : "1" (iph), "2" (ihl) - : "t"); - - return csum_fold(sum); -} - -static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, - unsigned short len, - unsigned short proto, - __wsum sum) -{ -#ifdef __LITTLE_ENDIAN__ - unsigned long len_proto = (proto + len) << 8; +#ifdef CONFIG_SUPERH32 +# include "checksum_32.h" #else - unsigned long len_proto = proto + len; +# include "checksum_64.h" #endif - __asm__("clrt\n\t" - "addc %0, %1\n\t" - "addc %2, %1\n\t" - "addc %3, %1\n\t" - "movt %0\n\t" - "add %1, %0" - : "=r" (sum), "=r" (len_proto) - : "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum) - : "t"); - return sum; -} - -/* - * computes the checksum of the TCP/UDP pseudo-header - * returns a 16-bit checksum, already complemented - */ -static __inline__ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, - unsigned short len, - unsigned short proto, - __wsum sum) -{ - return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); -} - -/* - * this routine is used for miscellaneous IP-like checksums, mainly - * in icmp.c - */ - -static __inline__ __sum16 ip_compute_csum(const void *buff, int len) -{ - return csum_fold (csum_partial(buff, len, 0)); -} - -#define _HAVE_ARCH_IPV6_CSUM -#ifdef CONFIG_IPV6 -static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, - const struct in6_addr *daddr, - __u32 len, unsigned short proto, - __wsum sum) -{ - unsigned int __dummy; - __asm__("clrt\n\t" - "mov.l @(0,%2), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(4,%2), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(8,%2), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(12,%2), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(0,%3), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(4,%3), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(8,%3), %1\n\t" - "addc %1, %0\n\t" - "mov.l @(12,%3), %1\n\t" - "addc %1, %0\n\t" - "addc %4, %0\n\t" - "addc %5, %0\n\t" - "movt %1\n\t" - "add %1, %0\n" - : "=r" (sum), "=&r" (__dummy) - : "r" (saddr), "r" (daddr), - "r" (htonl(len)), "r" (htonl(proto)), "0" (sum) - : "t"); - - return csum_fold(sum); -} -#endif - -/* - * Copy and checksum to user - */ -#define HAVE_CSUM_COPY_USER -static __inline__ __wsum csum_and_copy_to_user (const void *src, - void __user *dst, - int len, __wsum sum, - int *err_ptr) -{ - if (access_ok(VERIFY_WRITE, dst, len)) - return csum_partial_copy_generic((__force const void *)src, - dst, len, sum, NULL, err_ptr); - - if (len) - *err_ptr = -EFAULT; - - return (__force __wsum)-1; /* invalid checksum */ -} -#endif /* __ASM_SH_CHECKSUM_H */