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Annotation of sys/arch/hppa64/hppa64/in_cksum.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: in_cksum.c,v 1.1 2005/04/01 10:40:47 mickey Exp $     */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2000 Michael Shalayeff
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * based on a sparc version of Zubin Dittia.
        !             8:  * Copyright (c) 1995 Zubin Dittia.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  *
        !            19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            20:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            21:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            22:  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
        !            23:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            24:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            25:  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            27:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
        !            28:  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
        !            29:  * THE POSSIBILITY OF SUCH DAMAGE.
        !            30:  */
        !            31:
        !            32: #include <sys/param.h>
        !            33: #include <sys/systm.h>
        !            34: #include <sys/mbuf.h>
        !            35: #include <netinet/in.h>
        !            36:
        !            37: /*
        !            38:  * Checksum routine for Internet Protocol family headers.
        !            39:  *
        !            40:  * This routine is very heavily used in the network
        !            41:  * code and should be modified for each CPU to be as fast as possible.
        !            42:  *
        !            43:  * HPPA version.
        !            44:  */
        !            45:
        !            46: /* TODO optimize */
        !            47:
        !            48: #define ADD32  asm volatile(   "ldw 0x00(%1), %%r19! ldw 0x04(%1), %%r20\n\t" \
        !            49:                                "add  %0, %%r19, %0 ! addc  %0, %%r20, %0\n\t" \
        !            50:                                "ldw 0x08(%1), %%r19! ldw 0x0c(%1), %%r20\n\t" \
        !            51:                                "addc %0, %%r19, %0 ! addc  %0, %%r20, %0\n\t" \
        !            52:                                "ldw 0x10(%1), %%r19! ldw 0x14(%1), %%r20\n\t" \
        !            53:                                "addc %0, %%r19, %0 ! addc  %0, %%r20, %0\n\t" \
        !            54:                                "ldw 0x18(%1), %%r19! ldw 0x1c(%1), %%r20\n\t" \
        !            55:                                "addc %0, %%r19, %0 ! addc  %0, %%r20, %0\n\t" \
        !            56:                                "ldo 0x20(%1), %1   ! addc  %0, %%r0 , %0" \
        !            57:                                : "+r" (sum), "+r" (w) :: "r20", "r19")
        !            58: #define ADD16  asm volatile(   "ldw 0x00(%1), %%r19! ldw 0x04(%1), %%r20\n\t" \
        !            59:                                "add   %0, %%r19, %0! addc  %0, %%r20, %0\n\t" \
        !            60:                                "ldw 0x08(%1), %%r19! ldw 0x0c(%1), %%r20\n\t" \
        !            61:                                "addc  %0, %%r19, %0! addc  %0, %%r20, %0\n\t" \
        !            62:                                "ldo 0x10(%1), %1   ! addc  %0, %%r0 , %0" \
        !            63:                                : "+r" (sum), "+r" (w) :: "r20", "r19")
        !            64:
        !            65: #define ADDCARRY       {if (sum > 0xffff) sum -= 0xffff;}
        !            66: #define REDUCE         {sum = (sum & 0xffff) + (sum >> 16); ADDCARRY}
        !            67: #define ROL            asm volatile ("shd %0, %0, 8, %0" : "+r" (sum))
        !            68: #define ADDBYTE                {ROL; sum += *w++; bins++; mlen--;}
        !            69: #define ADDSHORT       {sum += *((u_short *)w)++; mlen -= 2;}
        !            70: #define ADDWORD        asm volatile(   "ldwm 4(%1), %%r19! add %0, %%r19, %0\n\t" \
        !            71:                                "ldo -4(%2), %2   ! addc    %0, 0, %0" \
        !            72:                                : "+r" (sum), "+r" (w), "+r" (mlen) :: "r19")
        !            73:
        !            74: int
        !            75: in_cksum(m, len)
        !            76:        register struct mbuf *m;
        !            77:        register int len;
        !            78: {
        !            79:        register u_int sum = 0;
        !            80:        register u_int bins = 0;
        !            81:
        !            82:        for (; m && len; m = m->m_next) {
        !            83:                register int mlen = m->m_len;
        !            84:                register u_char *w;
        !            85:
        !            86:                if (!mlen)
        !            87:                        continue;
        !            88:                if (len < mlen)
        !            89:                        mlen = len;
        !            90:                len -= mlen;
        !            91:                w = mtod(m, u_char *);
        !            92:
        !            93:                if (mlen > 16) {
        !            94:                        /*
        !            95:                         * If we are aligned on a doubleword boundary
        !            96:                         * do 32 bit bundled operations
        !            97:                         */
        !            98:                        if ((7 & (u_long)w) != 0) {
        !            99:                                if ((1 & (u_long)w) != 0)
        !           100:                                        ADDBYTE;
        !           101:                                if ((2 & (u_long)w) != 0)
        !           102:                                        ADDSHORT;
        !           103:                                if ((4 & (u_long)w) != 0)
        !           104:                                        ADDWORD;
        !           105:                        }
        !           106:
        !           107:                        while ((mlen -= 32) >= 0)
        !           108:                                ADD32;
        !           109:
        !           110:                        mlen += 32;
        !           111:                        if (mlen >= 16) {
        !           112:                                ADD16;
        !           113:                                mlen -= 16;
        !           114:                        }
        !           115:                }
        !           116:
        !           117:                while (mlen > 0)
        !           118:                        ADDBYTE;
        !           119:        }
        !           120:        if (bins & 1)
        !           121:                ROL;
        !           122:        REDUCE;
        !           123:
        !           124:        return (0xffff ^ sum);
        !           125: }