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Diffstat (limited to 'include/asm-xtensa/checksum.h')
| -rw-r--r-- | include/asm-xtensa/checksum.h | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/include/asm-xtensa/checksum.h b/include/asm-xtensa/checksum.h deleted file mode 100644 index 23534c6..0000000 --- a/include/asm-xtensa/checksum.h +++ /dev/null @@ -1,250 +0,0 @@ -/* - * include/asm-xtensa/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) 2001 - 2005 Tensilica Inc. - */ - -#ifndef _XTENSA_CHECKSUM_H -#define _XTENSA_CHECKSUM_H - -#include <linux/in6.h> -#include <asm/variant/core.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 - */ -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__("extui %1, %0, 16, 16\n\t" - "extui %0 ,%0, 0, 16\n\t" - "add %0, %0, %1\n\t" - "slli %1, %0, 16\n\t" - "add %0, %0, %1\n\t" - "extui %0, %0, 16, 16\n\t" - "neg %0, %0\n\t" - "addi %0, %0, -1\n\t" - "extui %0, %0, 0, 16\n\t" - : "=r" (sum), "=&r" (__dummy) - : "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. - */ -static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl) -{ - unsigned int sum, tmp, endaddr; - - __asm__ __volatile__( - "sub %0, %0, %0\n\t" -#if XCHAL_HAVE_LOOPS - "loopgtz %2, 2f\n\t" -#else - "beqz %2, 2f\n\t" - "slli %4, %2, 2\n\t" - "add %4, %4, %1\n\t" - "0:\t" -#endif - "l32i %3, %1, 0\n\t" - "add %0, %0, %3\n\t" - "bgeu %0, %3, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "addi %1, %1, 4\n\t" -#if !XCHAL_HAVE_LOOPS - "blt %1, %4, 0b\n\t" -#endif - "2:\t" - /* 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" (tmp), "=&r" (endaddr) - : "1" (iph), "2" (ihl)); - - return csum_fold(sum); -} - -static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, - unsigned short len, - unsigned short proto, - __wsum sum) -{ - -#ifdef __XTENSA_EL__ - unsigned long len_proto = (len + proto) << 8; -#elif defined(__XTENSA_EB__) - unsigned long len_proto = len + proto; -#else -# error processor byte order undefined! -#endif - __asm__("add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "add %0, %0, %2\n\t" - "bgeu %0, %2, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "add %0, %0, %3\n\t" - "bgeu %0, %3, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - : "=r" (sum), "=r" (len_proto) - : "r" (daddr), "r" (saddr), "1" (len_proto), "0" (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) -{ - unsigned int __dummy; - __asm__("l32i %1, %2, 0\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %2, 4\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %2, 8\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %2, 12\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %3, 0\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %3, 4\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %3, 8\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "l32i %1, %3, 12\n\t" - "add %0, %0, %1\n\t" - "bgeu %0, %1, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "add %0, %0, %4\n\t" - "bgeu %0, %4, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - "add %0, %0, %5\n\t" - "bgeu %0, %5, 1f\n\t" - "addi %0, %0, 1\n\t" - "1:\t" - : "=r" (sum), "=&r" (__dummy) - : "r" (saddr), "r" (daddr), - "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)); - - return csum_fold(sum); -} - -/* - * 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(src, dst, len, sum, NULL, err_ptr); - - if (len) - *err_ptr = -EFAULT; - - return (__force __wsum)-1; /* invalid checksum */ -} -#endif |
