File: [local] / sys / arch / m68k / m68k / in_cksum.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:06:30 2008 UTC (16 years, 3 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
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/* $OpenBSD: in_cksum.c,v 1.4 2003/06/02 23:27:48 millert Exp $ */
/* $NetBSD: in_cksum.c,v 1.6 1996/04/30 11:57:05 briggs Exp $ */
/*
* Copyright (c) 1988, 1990 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah Hdr: in_cksum.c 1.1 90/07/09
*
* @(#)in_cksum.c 7.3 (Berkeley) 12/16/90
*/
/*
* in_cksum - checksum routine for the Internet Protocol family.
*/
#include <sys/param.h>
#include <sys/mbuf.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
extern int oc_cksum(char *buffer, int length, int startingval);
/*
* Checksum routine for the Internet Protocol family.
*
* This isn't as bad as it looks. For ip headers the "while" isn't
* executed and we just drop through to the return statement at the
* end. For the usual tcp or udp packet (a single header mbuf
* chained onto a cluster of data, we make exactly one trip through
* the while (for the header mbuf) and never do the hairy code
* inside the "if". If fact, if m_copydata & sb_compact are doing
* their job, we should never do the hairy code inside the "if".
*/
int
in_cksum(m, len)
register struct mbuf *m;
register int len;
{
register int sum = 0;
register int i;
while (len > m->m_len) {
sum = oc_cksum(mtod(m, u_char *), i = m->m_len, sum);
m = m->m_next;
len -= i;
if (i & 1) {
/*
* ouch - we ended on an odd byte with more
* to do. This xfer is obviously not interested
* in performance so finish things slowly.
*/
register u_char *cp;
while (len > m->m_len) {
cp = mtod(m, u_char *);
if (i & 1) {
i = m->m_len - 1;
--len;
sum += *cp++;
} else
i = m->m_len;
sum = oc_cksum(cp, i, sum);
m = m->m_next;
len -= i;
}
if (i & 1) {
cp = mtod(m, u_char *);
sum += *cp++;
return (0xffff & ~oc_cksum(cp, len - 1, sum));
}
}
}
return (0xffff & ~oc_cksum(mtod(m, u_char *), len, sum));
}