diff options
Diffstat (limited to 'include/asm-m32r/checksum.h')
| -rw-r--r-- | include/asm-m32r/checksum.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/include/asm-m32r/checksum.h b/include/asm-m32r/checksum.h new file mode 100644 index 000000000000..99f37dbf2558 --- /dev/null +++ b/include/asm-m32r/checksum.h @@ -0,0 +1,208 @@ +#ifdef __KERNEL__ +#ifndef _ASM_M32R_CHECKSUM_H +#define _ASM_M32R_CHECKSUM_H + +/* + * include/asm-m32r/checksum.h + * + * IP/TCP/UDP checksum routines + * + * 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. + * + * Some code taken from mips and parisc architecture. + * + * Copyright (C) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata + * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> + */ + +#include <linux/in6.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 unsigned int csum_partial(const unsigned char *buff, + int len, unsigned int sum); + +/* + * The same as csum_partial, but copies from src while it checksums. + * + * Here even more important to align src and dst on a 32-bit (or even + * better 64-bit) boundary + */ +extern unsigned int csum_partial_copy_nocheck(const unsigned char *src, + unsigned char *dst, + int len, unsigned int sum); + +/* + * This is a new version of the above that records errors it finds in *errp, + * but continues and zeros thre rest of the buffer. + */ +extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src, + unsigned char *dst, + int len, unsigned int sum, + int *err_ptr); + +/* + * Fold a partial checksum + */ + +static inline unsigned int csum_fold(unsigned int sum) +{ + unsigned long tmpreg; + __asm__( + " sll3 %1, %0, #16 \n" + " cmp %0, %0 \n" + " addx %0, %1 \n" + " ldi %1, #0 \n" + " srli %0, #16 \n" + " addx %0, %1 \n" + " xor3 %0, %0, #0x0000ffff \n" + : "=r" (sum), "=&r" (tmpreg) + : "0" (sum) + : "cbit" + ); + return sum; +} + +/* + * This is a version of ip_compute_csum() optimized for IP headers, + * which always checksum on 4 octet boundaries. + */ +static inline unsigned short ip_fast_csum(unsigned char * iph, + unsigned int ihl) { + unsigned long sum, tmpreg0, tmpreg1; + + __asm__ __volatile__( + " ld %0, @%1+ \n" + " addi %2, #-4 \n" + "# bgez %2, 2f \n" + " cmp %0, %0 \n" + " ld %3, @%1+ \n" + " ld %4, @%1+ \n" + " addx %0, %3 \n" + " ld %3, @%1+ \n" + " addx %0, %4 \n" + " addx %0, %3 \n" + " .fillinsn\n" + "1: \n" + " ld %4, @%1+ \n" + " addi %2, #-1 \n" + " addx %0, %4 \n" + " bgtz %2, 1b \n" + "\n" + " ldi %3, #0 \n" + " addx %0, %3 \n" + " .fillinsn\n" + "2: \n" + /* Since the input registers which are loaded with iph and ipl + 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" (tmpreg0), "=&r" (tmpreg1) + : "1" (iph), "2" (ihl) + : "cbit", "memory"); + + return csum_fold(sum); +} + +static inline unsigned long csum_tcpudp_nofold(unsigned long saddr, + unsigned long daddr, + unsigned short len, + unsigned short proto, + unsigned int sum) +{ +#if defined(__LITTLE_ENDIAN) + unsigned long len_proto = (ntohs(len)<<16)+proto*256; +#else + unsigned long len_proto = (proto<<16)+len; +#endif + unsigned long tmpreg; + + __asm__( + " cmp %0, %0 \n" + " addx %0, %2 \n" + " addx %0, %3 \n" + " addx %0, %4 \n" + " ldi %1, #0 \n" + " addx %0, %1 \n" + : "=r" (sum), "=&r" (tmpreg) + : "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum) + : "cbit" + ); + + return sum; +} + +/* + * computes the checksum of the TCP/UDP pseudo-header + * returns a 16-bit checksum, already complemented + */ +static inline unsigned short int csum_tcpudp_magic(unsigned long saddr, + unsigned long daddr, + unsigned short len, + unsigned short proto, + unsigned int 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 unsigned short ip_compute_csum(unsigned char * buff, int len) { + return csum_fold (csum_partial(buff, len, 0)); +} + +#define _HAVE_ARCH_IPV6_CSUM +static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr, + struct in6_addr *daddr, + __u16 len, + unsigned short proto, + unsigned int sum) +{ + unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3; + __asm__( + " ld %1, @(%5) \n" + " ld %2, @(4,%5) \n" + " ld %3, @(8,%5) \n" + " ld %4, @(12,%5) \n" + " add %0, %1 \n" + " addx %0, %2 \n" + " addx %0, %3 \n" + " addx %0, %4 \n" + " ld %1, @(%6) \n" + " ld %2, @(4,%6) \n" + " ld %3, @(8,%6) \n" + " ld %4, @(12,%6) \n" + " addx %0, %1 \n" + " addx %0, %2 \n" + " addx %0, %3 \n" + " addx %0, %4 \n" + " addx %0, %7 \n" + " addx %0, %8 \n" + " ldi %1, #0 \n" + " addx %0, %1 \n" + : "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1), + "=&r" (tmpreg2), "=&r" (tmpreg3) + : "r" (saddr), "r" (daddr), + "r" (htonl((__u32) (len))), "r" (htonl(proto)), "0" (sum) + : "cbit" + ); + + return csum_fold(sum); +} + +#endif /* _ASM_M32R_CHECKSUM_H */ +#endif /* __KERNEL__ */ |