Update of /cvsroot/linux-vax/kernel-2.4/arch/vax/lib
In directory usw-pr-cvs1:/tmp/cvs-serv16746
Modified Files:
Makefile
Added Files:
checksum.S
Removed Files:
checksum.c
Log Message:
DA: My implementation of csum_partial.. seems to work ...removed checksum.c
no longer needed
--- NEW FILE ---
/* $Id: checksum.S,v 1.1 2001/03/03 02:18:22 airlied Exp $
*
* 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.
*
* IP/TCP/UDP checksumming routines
*
* Authors: Jorge Cwik, <jo...@la...>
* Arnt Gulbrandsen, <ag...@nv...>
* Tom May, <ft...@ne...>
* Pentium Pro/II routines:
* Alexander Kjeldaas <as...@gu...>
* Finn Arne Gangstad <fi...@gu...>
* Lots of code moved from tcp.c and ip.c; see those files
* for more names.
*
* Changes: Ingo Molnar, converted csum_partial_copy() to 2.1 exception
* handling.
* Andi Kleen, add zeroing on error
* converted to pure assembler
*
* SuperH version: Copyright (C) 1999 Niibe Yutaka
*
* 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.
*/
/* VAX Hackery - Copyright (C) 2001 Dave Airlie <ai...@li...>
Thanks to ragge for giving me info on calling conventions */
#include <asm/errno.h>
#include <linux/linkage.h>
/*
* computes a partial checksum, e.g. for TCP/UDP fragments
*/
/*
* unsigned int csum_partial(const unsigned char *buf, int len,
* unsigned int sum);
*/
.text
ENTRY(csum_partial)
.word 0x3e
movl 4(ap), r2 /* r2 now has buf */
movl 8(ap), r3 /* r3 has len */
movl 12(ap), r0 /* r4 has sum */
/* test stuff */
# Check Alignment
# Jump if it okay
# Alignment uses up two bytes
# Jump if we have two bytes
# something < 2 deal with it
bbc $1, r2, 2f # Check is bit 1 , jump if clear
subl2 $2, r3 # Alignment uses up 2 bytes
bgequ 1f # Jump if we have at least two bytes
addl2 $2, r3 # Deal with it if we haven't
jmp 6f
1:
/* If here copy halfword, and checksum it, */
addw2 (r2), r0 # Add the half double-word to r0
adwc $0, r0 # Carry
addl2 $2, r2 # move pointer on two bytes
2: /* Get 32-bit word count and do 3 checksum on it */
/* if 0 count jump over it */
# divl3 $32, r3, r5
ashl $-5, r3, r5
beqlu 4f
3: addl2 (r2), r0 # Checksum 32 bytes
adwc 4(r2), r0
adwc 8(r2), r0
adwc 12(r2), r0
adwc 16(r2), r0
adwc 20(r2), r0
adwc 24(r2), r0
adwc 28(r2), r0
adwc $0, r0
addl2 $32, r2
sobgtr r5,3b
/* jump not equal back to 3b*/
4: bicl3 $0xFFFFFFE3, r3, r5 /* D.A. My method for an AND, AND r3 with 0x1C (00011100) */
/* this put in r5 a value of 4, 8, 12, 16, 20, 24, 28 bytes */
beqlu 6f
/* rotate r5 by -2 gives 1, 2, 3, 4, 5, 6, 7 */
rotl $-2, r5, r5
5: addl2 (r2), r0 /* Add in long from R2 */
adwc $0, r0 /* Add in carry */
addl2 $4, r2 /* move r2 pointer along 4 bytes */
sobgtr r5, 5b /* jump to 5: if r5 is > 0 */
6: bicl3 $0xFFFFFFFC, r3, r5 /* AND either 1 or 2 into r5 */
beqlu 9f /* if no further bytes we are finished */
cmpl $2, r5 /* compare what we have left with 2 */
blssu 7f /* if 2 or greater go to 7f */
movw (r2), r3 /* move a word into r3 */
addl2 $2, r2 /* move r2 on two bytes */
cmpl $2, r5
beqlu 8f /* if what are we checking here?? */
rotl $16, r3, r3 /* rotate r3 by a half word. */
bicl2 $0xFFFF, r3 /* AND off bottom half */
7: addb2 (r2), r3 /* ADD Byte from R2 to R3 */
8: addl2 r3, r0 /* Add Long R3 */
adwc $0, r0 /* Add in any carry */
9: ret
Index: Makefile
===================================================================
RCS file: /cvsroot/linux-vax/kernel-2.4/arch/vax/lib/Makefile,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -r1.6 -r1.7
--- Makefile 2001/02/25 00:37:31 1.6
+++ Makefile 2001/03/03 02:18:22 1.7
@@ -7,6 +7,12 @@
#
# Note 2! The CFLAGS definitions are now in the main makefile...
+.S.s:
+ $(CPP) $(AFLAGS) -traditional -o $*.o $<
+
+.S.o:
+ $(CC) $(AFLAGS) -traditional -c -o $*.o $<
+
all: libio.a
L_TARGET := libio.a
--- checksum.c DELETED ---
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