diff options
Diffstat (limited to 'cpukit/libnetworking/netinet/in_cksum_arm.h')
-rw-r--r-- | cpukit/libnetworking/netinet/in_cksum_arm.h | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/cpukit/libnetworking/netinet/in_cksum_arm.h b/cpukit/libnetworking/netinet/in_cksum_arm.h deleted file mode 100644 index d884a0f7da..0000000000 --- a/cpukit/libnetworking/netinet/in_cksum_arm.h +++ /dev/null @@ -1,236 +0,0 @@ -/* $NetBSD: in_cksum_arm.c,v 1.3 2001/12/08 21:18:50 chris Exp $ */ - -/* - * ARM version: - * - * Copyright (c) 1997 Mark Brinicome - * Copyright (c) 1997 Causality Limited - * - * Based on the sparc version. - */ - -/* - * Sparc version: - * - * Copyright (c) 1995 Zubin Dittia. - * Copyright (c) 1995 Matthew R. Green. - * Copyright (c) 1994 Charles M. Hannum. - * Copyright (c) 1992, 1993 - * The 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. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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. - * - * @(#)in_cksum.c 8.1 (Berkeley) 6/11/93 - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/mbuf.h> -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/ip.h> -#include <netinet/ip_var.h> - -/* - * Checksum routine for Internet Protocol family headers. - * - * This routine is very heavily used in the network - * code and should be modified for each CPU to be as fast as possible. - * - * ARM version. - */ - -#define ADD64 __asm __volatile(" \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adds %1,%7,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adcs %1,%1,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adcs %1,%1,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adcs %1,%1,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - adcs %1,%1,#0\n" \ - : "=r" (w), "=r" (sum), "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4) \ - : "0" (w), "r" (sum) \ - : "cc") - -#define ADD32 __asm __volatile(" \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adds %1,%7,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adcs %1,%1,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - adcs %1,%1,#0\n" \ - : "=r" (w), "=r" (sum), "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4) \ - : "0" (w), "r" (sum) \ - : "cc") - -#define ADD16 __asm __volatile(" \n\ - ldmia %0!, {%2, %3, %4, %5} \n\ - adds %1,%7,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,%4; adcs %1,%1,%5 \n\ - adcs %1,%1,#0\n" \ - : "=r" (w), "=r" (sum), "=&r" (tmp1), "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4) \ - : "0" (w), "r" (sum) \ - : "cc") - -#define ADD8 __asm __volatile(" \n\ - ldmia %0!, {%2, %3} \n\ - adds %1,%5,%2; adcs %1,%1,%3 \n\ - adcs %1,%1,#0\n" \ - : "=r" (w), "=r" (sum), "=&r" (tmp1), "=&r" (tmp2) \ - : "0" (w), "r" (sum) \ - : "cc" ) - -#define ADD4 __asm __volatile(" \n\ - ldr %2,[%0],#4 \n\ - adds %1,%4,%2 \n\ - adcs %1,%1,#0\n" \ - : "=r" (w), "=r" (sum), "=&r" (tmp1) \ - : "0" (w), "r" (sum) \ - : "cc") - -/*#define REDUCE {sum = (sum & 0xffff) + (sum >> 16);}*/ -#define REDUCE __asm __volatile(" \n\ - mov %2, #0x00ff \n\ - orr %2, %2, #0xff00 \n\ - and %2, %0, %2 \n\ - add %0, %2, %0, lsr #16\n" \ - : "=r" (sum) \ - : "0" (sum), "r" (tmp1)) - -#define ADDCARRY {if (sum > 0xffff) sum -= 0xffff;} -#define ROL {sum = sum << 8;} /* depends on recent REDUCE */ -#define ADDBYTE {ROL; sum += (*w << 8); byte_swapped ^= 1;} -#define ADDSHORT {sum += *(u_short *)w;} -#define ADVANCE(n) {w += n; mlen -= n;} -#define ADVANCEML(n) {mlen -= n;} - -static __inline__ int -in_cksum_internal(struct mbuf *m, int off, int len, u_int sum) -{ - u_char *w; - int mlen = 0; - int byte_swapped = 0; - - /* - * Declare four temporary registers for use by the asm code. We - * allow the compiler to pick which specific machine registers to - * use, instead of hard-coding this in the asm code above. - */ - register u_int tmp1=0, tmp2, tmp3, tmp4; - - for (; m && len; m = m->m_next) { - if (m->m_len == 0) - continue; - w = mtod(m, u_char *) + off; - mlen = m->m_len - off; - off = 0; - if (len < mlen) - mlen = len; - len -= mlen; - - /* - * Ensure that we're aligned on a word boundary here so - * that we can do 32 bit operations below. - */ - if ((3 & (long)w) != 0) { - REDUCE; - if ((1 & (long)w) != 0 && mlen >= 1) { - ADDBYTE; - ADVANCE(1); - } - if ((2 & (long)w) != 0 && mlen >= 2) { - ADDSHORT; - ADVANCE(2); - } - } - - /* - * Do as many 32 bit operations as possible using the - * 64/32/16/8/4 macro's above, using as many as possible of - * these. - */ - - while (mlen >= 64) { - ADD64; - ADVANCEML(64); - } - if (mlen >= 32) { - ADD32; - ADVANCEML(32); - } - if (mlen >= 16) { - ADD16; - ADVANCEML(16); - } - if (mlen >= 8) { - ADD8; - ADVANCEML(8); - } - if (mlen >= 4) { - ADD4; - ADVANCEML(4) - } - if (mlen == 0) - continue; - - REDUCE; - if (mlen >= 2) { - ADDSHORT; - ADVANCE(2); - } - if (mlen == 1) { - ADDBYTE; - } - } - if (byte_swapped) { - REDUCE; - ROL; - } - REDUCE; - ADDCARRY; - - return (0xffff ^ sum); -} - -int -in_cksum( - struct mbuf *m, - int len) -{ - int cksum; - cksum =in_cksum_internal(m, 0, len, 0); - return cksum; -} |