From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/v850/lib/checksum.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 arch/v850/lib/checksum.c (limited to 'arch/v850/lib/checksum.c') diff --git a/arch/v850/lib/checksum.c b/arch/v850/lib/checksum.c new file mode 100644 index 00000000000..d308b724c02 --- /dev/null +++ b/arch/v850/lib/checksum.c @@ -0,0 +1,154 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * MIPS specific IP/TCP/UDP checksumming routines + * + * Authors: Ralf Baechle, + * Lots of code moved from tcp.c and ip.c; see those files + * for more names. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * $Id: checksum.c,v 1.1 2002/09/28 14:58:40 gerg Exp $ + */ +#include +#include +#include +#include +#include +#include + +static inline unsigned short from32to16 (unsigned long sum) +{ + unsigned int result; + /* + %0 %1 + hsw %1, %0 H L L H + add %1, %0 H L H+L+C H+L + */ + asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum)); + return result >> 16; +} + +static inline unsigned int do_csum(const unsigned char * buff, int len) +{ + int odd, count; + unsigned int result = 0; + + if (len <= 0) + goto out; + odd = 1 & (unsigned long) buff; + if (odd) { + result = be16_to_cpu(*buff); + len--; + buff++; + } + count = len >> 1; /* nr of 16-bit words.. */ + if (count) { + if (2 & (unsigned long) buff) { + result += *(unsigned short *) buff; + count--; + len -= 2; + buff += 2; + } + count >>= 1; /* nr of 32-bit words.. */ + if (count) { + unsigned int carry = 0; + do { + unsigned int w = *(unsigned int *) buff; + count--; + buff += 4; + result += carry; + result += w; + carry = (w > result); + } while (count); + result += carry; + result = (result & 0xffff) + (result >> 16); + } + if (len & 2) { + result += *(unsigned short *) buff; + buff += 2; + } + } + if (len & 1) + result += le16_to_cpu(*buff); + result = from32to16(result); + if (odd) + result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); +out: + return result; +} + +/* + * This is a version of ip_compute_csum() optimized for IP headers, + * which always checksum on 4 octet boundaries. + */ +unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl) +{ + return ~do_csum(iph,ihl*4); +} + +/* + * this routine is used for miscellaneous IP-like checksums, mainly + * in icmp.c + */ +unsigned short ip_compute_csum(const unsigned char * buff, int len) +{ + return ~do_csum(buff,len); +} + +/* + * computes a partial checksum, e.g. for TCP/UDP fragments + */ +unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum) +{ + unsigned int result = do_csum(buff, len); + + /* add in old sum, and carry.. */ + result += sum; + if(sum > result) + result += 1; + return result; +} + +EXPORT_SYMBOL(csum_partial); + +/* + * copy while checksumming, otherwise like csum_partial + */ +unsigned int csum_partial_copy(const unsigned char *src, unsigned char *dst, + int len, unsigned int sum) +{ + /* + * It's 2:30 am and I don't feel like doing it real ... + * This is lots slower than the real thing (tm) + */ + sum = csum_partial(src, len, sum); + memcpy(dst, src, len); + + return sum; +} + +/* + * Copy from userspace and compute checksum. If we catch an exception + * then zero the rest of the buffer. + */ +unsigned int csum_partial_copy_from_user (const unsigned char *src, unsigned char *dst, + int len, unsigned int sum, + int *err_ptr) +{ + int missing; + + missing = copy_from_user(dst, src, len); + if (missing) { + memset(dst + len - missing, 0, missing); + *err_ptr = -EFAULT; + } + + return csum_partial(dst, len, sum); +} -- cgit v1.2.3