patch-1.3.2 linux/net/ipv4/checksum.c

• Lines: 182
• Date: Thu Jan 1 02:00:00 1970
• Orig file: v1.3.1/linux/net/ipv4/checksum.c
• Orig date: Tue Jun 6 12:16:43 1995

diff -u --recursive --new-file v1.3.1/linux/net/ipv4/checksum.c linux/net/ipv4/checksum.c
@@ -1,181 +0,0 @@
-/*
- * 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, <jorge@laser.satlink.net>
- *		Arnt Gulbrandsen, <agulbra@nvg.unit.no>
- *		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.
- */
-
-#include <net/checksum.h>
-
-/*
- * computes a partial checksum, e.g. for TCP/UDP fragments
- */
-
-unsigned int csum_partial(unsigned char * buff, int len, unsigned int sum) {
-#ifdef __i386__
-	__asm__("
-	    movl %%ecx, %%edx
-	    cld
-	    shrl $5, %%ecx
-	    jz 2f
-	    orl %%ecx, %%ecx
-1:	    movl (%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 4(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 8(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 12(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 16(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 20(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 24(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    movl 28(%%esi), %%eax
-	    adcl %%eax, %%ebx
-	    lea 32(%%esi), %%esi
-	    dec %%ecx
-	    jne 1b
-	    adcl $0, %%ebx
-2:	    movl %%edx, %%ecx
-	    andl $28, %%ecx
-	    je 4f
-	    shrl $2, %%ecx
-	    orl %%ecx, %%ecx
-3:	    adcl (%%esi), %%ebx
-	    lea 4(%%esi), %%esi
-	    dec %%ecx
-	    jne 3b
-	    adcl $0, %%ebx
-4:	    movl $0, %%eax
-	    testw $2, %%dx
-	    je 5f
-	    lodsw
-	    addl %%eax, %%ebx
-	    adcl $0, %%ebx
-	    movw $0, %%ax
-5:	    test $1, %%edx
-	    je 6f
-	    lodsb
-	    addl %%eax, %%ebx
-	    adcl $0, %%ebx
-6:	    "
-	: "=b"(sum)
-	: "0"(sum), "c"(len), "S"(buff)
-	: "ax", "bx", "cx", "dx", "si" );
-#else
-#error Not implemented for this CPU
-#endif
-	return(sum);
-}
-
-
-
-/*
- * copy from fs while checksumming, otherwise like csum_partial
- */
-
-unsigned int csum_partial_copyffs( char *src, char *dst, 
-				  int len, int sum) {
-#ifdef __i386__
-    __asm__("
-	push %%ds
-	push %%es
-	movw %%ds, %%dx
-	movw %%dx, %%es
-	movw %%fs, %%dx
-	movw %%dx, %%ds
-	cld
-	cmpl $32, %%ecx
-	jb 2f
-	pushl %%ecx
-	shrl $5, %%ecx
-	orl %%ecx, %%ecx
-1:	movl (%%esi), %%eax
-	movl 4(%%esi), %%edx
-	adcl %%eax, %%ebx
-	movl %%eax, %%es:(%%edi)
-	adcl %%edx, %%ebx
-	movl %%edx, %%es:4(%%edi)
-
-	movl 8(%%esi), %%eax
-	movl 12(%%esi), %%edx
-	adcl %%eax, %%ebx
-	movl %%eax, %%es:8(%%edi)
-	adcl %%edx, %%ebx
-	movl %%edx, %%es:12(%%edi)
-
-	movl 16(%%esi), %%eax
-	movl 20(%%esi), %%edx
-	adcl %%eax, %%ebx
-	movl %%eax, %%es:16(%%edi)
-	adcl %%edx, %%ebx
-	movl %%edx, %%es:20(%%edi)
-
-	movl 24(%%esi), %%eax
-	movl 28(%%esi), %%edx
-	adcl %%eax, %%ebx
-	movl %%eax, %%es:24(%%edi)
-	adcl %%edx, %%ebx
-	movl %%edx, %%es:28(%%edi)
-
-	lea 32(%%esi), %%esi
-	lea 32(%%edi), %%edi
-	dec %%ecx
-	jne 1b
-	adcl $0, %%ebx
-	popl %%ecx
-2:	movl %%ecx, %%edx
-	andl $28, %%ecx
-	je 4f
-	shrl $2, %%ecx
-	orl %%ecx, %%ecx
-3:	movl (%%esi), %%eax
-	adcl %%eax, %%ebx
-	movl %%eax, %%es:(%%edi)
-	lea 4(%%esi), %%esi
-	lea 4(%%edi), %%edi
-	dec %%ecx
-	jne 3b
-	adcl $0, %%ebx
-4:	movl $0, %%eax
-	testl $2, %%edx
-	je 5f
-	lodsw
-	stosw
-	addl %%eax, %%ebx
-	movw $0, %%ax
-	adcl %%eax, %%ebx
-5:	test $1, %%edx
-	je 6f
-	lodsb
-	stosb
-	addl %%eax, %%ebx
-	adcl $0, %%ebx
-6:	pop %%es
-	pop %%ds
-	"
-	: "=b"(sum)
-	: "0"(sum), "c"(len), "S"(src), "D"(dst)
-	: "ax", "bx", "cx", "dx", "si", "di" );
-#else
-#error Not implemented for this CPU
-#endif
-    return(sum);
-}
-
-
-