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Diffstat (limited to 'include/asm-mips/checksum.h')
| -rw-r--r-- | include/asm-mips/checksum.h | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/include/asm-mips/checksum.h b/include/asm-mips/checksum.h deleted file mode 100644 index 290485ac5407..000000000000 --- a/include/asm-mips/checksum.h +++ /dev/null @@ -1,260 +0,0 @@ -/* - * 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) 1995, 96, 97, 98, 99, 2001 by Ralf Baechle - * Copyright (C) 1999 Silicon Graphics, Inc. - * Copyright (C) 2001 Thiemo Seufer. - * Copyright (C) 2002 Maciej W. Rozycki - */ -#ifndef _ASM_CHECKSUM_H -#define _ASM_CHECKSUM_H - -#include <linux/in6.h> - -#include <asm/uaccess.h> - -/* - * 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 - */ -__wsum csum_partial(const void *buff, int len, __wsum sum); - -__wsum __csum_partial_copy_user(const void *src, void *dst, - int len, __wsum sum, int *err_ptr); - -/* - * this is a new version of the above that records errors it finds in *errp, - * but continues and zeros the rest of the buffer. - */ -static inline -__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, - __wsum sum, int *err_ptr) -{ - might_sleep(); - return __csum_partial_copy_user((__force void *)src, dst, - len, sum, err_ptr); -} - -/* - * 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) -{ - might_sleep(); - if (access_ok(VERIFY_WRITE, dst, len)) - return __csum_partial_copy_user(src, (__force void *)dst, - len, sum, err_ptr); - if (len) - *err_ptr = -EFAULT; - - return (__force __wsum)-1; /* invalid checksum */ -} - -/* - * the same as csum_partial, but copies from user space (but on MIPS - * we have just one address space, so this is identical to the above) - */ -__wsum csum_partial_copy_nocheck(const void *src, void *dst, - int len, __wsum sum); - -/* - * Fold a partial checksum without adding pseudo headers - */ -static inline __sum16 csum_fold(__wsum sum) -{ - __asm__( - " .set push # csum_fold\n" - " .set noat \n" - " sll $1, %0, 16 \n" - " addu %0, $1 \n" - " sltu $1, %0, $1 \n" - " srl %0, %0, 16 \n" - " addu %0, $1 \n" - " xori %0, 0xffff \n" - " .set pop" - : "=r" (sum) - : "0" (sum)); - - return (__force __sum16)sum; -} - -/* - * This is a version of ip_compute_csum() optimized for IP headers, - * which always checksum on 4 octet boundaries. - * - * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by - * Arnt Gulbrandsen. - */ -static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) -{ - const unsigned int *word = iph; - const unsigned int *stop = word + ihl; - unsigned int csum; - int carry; - - csum = word[0]; - csum += word[1]; - carry = (csum < word[1]); - csum += carry; - - csum += word[2]; - carry = (csum < word[2]); - csum += carry; - - csum += word[3]; - carry = (csum < word[3]); - csum += carry; - - word += 4; - do { - csum += *word; - carry = (csum < *word); - csum += carry; - word++; - } while (word != stop); - - return csum_fold(csum); -} - -static inline __wsum csum_tcpudp_nofold(__be32 saddr, - __be32 daddr, unsigned short len, unsigned short proto, - __wsum sum) -{ - __asm__( - " .set push # csum_tcpudp_nofold\n" - " .set noat \n" -#ifdef CONFIG_32BIT - " addu %0, %2 \n" - " sltu $1, %0, %2 \n" - " addu %0, $1 \n" - - " addu %0, %3 \n" - " sltu $1, %0, %3 \n" - " addu %0, $1 \n" - - " addu %0, %4 \n" - " sltu $1, %0, %4 \n" - " addu %0, $1 \n" -#endif -#ifdef CONFIG_64BIT - " daddu %0, %2 \n" - " daddu %0, %3 \n" - " daddu %0, %4 \n" - " dsll32 $1, %0, 0 \n" - " daddu %0, $1 \n" - " dsra32 %0, %0, 0 \n" -#endif - " .set pop" - : "=r" (sum) - : "0" ((__force unsigned long)daddr), - "r" ((__force unsigned long)saddr), -#ifdef __MIPSEL__ - "r" ((proto + len) << 8), -#else - "r" (proto + len), -#endif - "r" ((__force unsigned long)sum)); - - 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 -static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, - const struct in6_addr *daddr, - __u32 len, unsigned short proto, - __wsum sum) -{ - __asm__( - " .set push # csum_ipv6_magic\n" - " .set noreorder \n" - " .set noat \n" - " addu %0, %5 # proto (long in network byte order)\n" - " sltu $1, %0, %5 \n" - " addu %0, $1 \n" - - " addu %0, %6 # csum\n" - " sltu $1, %0, %6 \n" - " lw %1, 0(%2) # four words source address\n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 4(%2) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 8(%2) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 12(%2) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 0(%3) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 4(%3) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 8(%3) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " lw %1, 12(%3) \n" - " addu %0, $1 \n" - " addu %0, %1 \n" - " sltu $1, %0, %1 \n" - - " addu %0, $1 # Add final carry\n" - " .set pop" - : "=r" (sum), "=r" (proto) - : "r" (saddr), "r" (daddr), - "0" (htonl(len)), "1" (htonl(proto)), "r" (sum)); - - return csum_fold(sum); -} - -#endif /* _ASM_CHECKSUM_H */ |
