diff options
Diffstat (limited to 'include/asm-avr32/checksum.h')
| -rw-r--r-- | include/asm-avr32/checksum.h | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/include/asm-avr32/checksum.h b/include/asm-avr32/checksum.h deleted file mode 100644 index 4ddbfd2486a..00000000000 --- a/include/asm-avr32/checksum.h +++ /dev/null @@ -1,152 +0,0 @@ -/* - * Copyright (C) 2004-2006 Atmel Corporation - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ -#ifndef __ASM_AVR32_CHECKSUM_H -#define __ASM_AVR32_CHECKSUM_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); - -/* - * 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 - */ -__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((const void __force *)src, dst, len, - sum, err_ptr, NULL); -} - -/* - * 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; - - __asm__ __volatile__( - " ld.w %0, %1++\n" - " ld.w %3, %1++\n" - " sub %2, 4\n" - " add %0, %3\n" - " ld.w %3, %1++\n" - " adc %0, %0, %3\n" - " ld.w %3, %1++\n" - " adc %0, %0, %3\n" - " acr %0\n" - "1: ld.w %3, %1++\n" - " add %0, %3\n" - " acr %0\n" - " sub %2, 1\n" - " brne 1b\n" - " lsl %3, %0, 16\n" - " andl %0, 0\n" - " mov %2, 0xffff\n" - " add %0, %3\n" - " adc %0, %0, %2\n" - " com %0\n" - " lsr %0, 16\n" - : "=r"(sum), "=r"(iph), "=r"(ihl), "=r"(tmp) - : "1"(iph), "2"(ihl) - : "memory", "cc"); - return (__force __sum16)sum; -} - -/* - * Fold a partial checksum - */ - -static inline __sum16 csum_fold(__wsum sum) -{ - unsigned int tmp; - - asm(" bfextu %1, %0, 0, 16\n" - " lsr %0, 16\n" - " add %0, %1\n" - " bfextu %1, %0, 16, 16\n" - " add %0, %1" - : "=&r"(sum), "=&r"(tmp) - : "0"(sum)); - - return (__force __sum16)~sum; -} - -static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, - unsigned short len, - unsigned short proto, - __wsum sum) -{ - asm(" add %0, %1\n" - " adc %0, %0, %2\n" - " adc %0, %0, %3\n" - " acr %0" - : "=r"(sum) - : "r"(daddr), "r"(saddr), "r"(len + proto), - "0"(sum) - : "cc"); - - 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)); -} - -#endif /* __ASM_AVR32_CHECKSUM_H */ |