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Annotation of kernel/bsd/netat/adsp_reset.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: 
        !            26: #include       <adsp_local.h>
        !            27: 
        !            28: /*
        !            29:  * RXFReset
        !            30:  *
        !            31:  * We just got a Forward Reset Packet.
        !            32:  *
        !            33:  * Called with interrupts OFF
        !            34:  *
        !            35:  * INPUTS:
        !            36:  *     stream pointer
        !            37:  *     Pointer to ADSP header,
        !            38:  * OUTPUTS:
        !            39:  *     Returns 1 if packet was ignored
        !            40:  */
        !            41: int RXFReset(sp, f)            /* (CCBPtr sp, ADSP_FRAMEPtr f) */
        !            42:     CCBPtr sp;
        !            43:     ADSP_FRAMEPtr f;
        !            44: {
        !            45:     unsigned int pktFirstByteSeq;
        !            46:     unsigned int hi;
        !            47:     register gbuf_t *mp;
        !            48:     register struct adspcmd *pb;
        !            49:     int s;
        !            50: 
        !            51:     ATDISABLE(s, sp->lock);
        !            52:     pktFirstByteSeq = netdw(UAL_VALUE(f->pktFirstByteSeq));
        !            53:     
        !            54:     hi = sp->recvSeq + CalcRecvWdw(sp);
        !            55: 
        !            56:     /*
        !            57:      * Must do this with interrupts OFF
        !            58:      */
        !            59:     if (BETWEEN(sp->recvSeq, pktFirstByteSeq, hi)) /* Is this acceptable? */
        !            60:     {
        !            61:        struct adspcmd *qhead;
        !            62: 
        !            63:        sp->recvSeq = pktFirstByteSeq;
        !            64:        while (mp = sp->rbuf_mb) { /* clear the receive queue */
        !            65:            sp->rbuf_mb = gbuf_next(mp);
        !            66:            gbuf_freem(mp);
        !            67:        }
        !            68:        if (sp->crbuf_mb) {
        !            69:            gbuf_freem(sp->crbuf_mb);
        !            70:            sp->crbuf_mb = 0;
        !            71:        }
        !            72:        sp->rData = 0;
        !            73:        sp->rbufFull = 0;
        !            74:        sp->userFlags |= eFwdReset; /* Set forward reset received Flag */
        !            75: 
        !            76:        mp = gbuf_alloc(sizeof(struct adspcmd), PRI_HI);
        !            77:        pb = (struct adspcmd *)gbuf_rptr(mp);
        !            78:        gbuf_winc(mp,sizeof(struct adspcmd));
        !            79:        pb->ioc = 0;
        !            80:        pb->mp = mp;
        !            81: 
        !            82:        pb->csCode = dspReset;
        !            83:        pb->ioResult = 0;
        !            84:        completepb(sp, pb);
        !            85:        sp->userFlags &= ~eFwdReset;
        !            86:     }
        !            87: 
        !            88:     if (LTE(pktFirstByteSeq, hi)) {
        !            89:        sp->sendCtl |= B_CTL_FRESETACK; /* Ack it if it's OK, or a duplicate */
        !            90:        sp->callSend = 1;
        !            91:     }
        !            92: 
        !            93:     ATENABLE(s, sp->lock);
        !            94:     return 0;
        !            95: }
        !            96: 
        !            97: 
        !            98: /*
        !            99:  * RXFResetAck
        !           100:  *
        !           101:  * We just got a Forward Reset Acknowledgement packet
        !           102:  *
        !           103:  * Called with interrupts OFF
        !           104:  *
        !           105:  * INPUTS:
        !           106:  *       stream pointer
        !           107:  *    Pointer to ADSP header,
        !           108:  * OUTPUTS:
        !           109:  *    Returns 1 if packet was ignored
        !           110:  */
        !           111: int RXFResetAck(sp, f)         /* (CCBPtr sp, ADSP_FRAMEPtr f) */
        !           112:     CCBPtr sp;
        !           113:     ADSP_FRAMEPtr f;
        !           114: {
        !           115:     unsigned int  PktNextRecvSeq;
        !           116:     int s;
        !           117: 
        !           118:     if (sp->frpb == 0)         /* Not expecting frwd reset Ack packet */
        !           119:        return 1;
        !           120: 
        !           121:     ATDISABLE(s, sp->lock);
        !           122:     PktNextRecvSeq = netdw(UAL_VALUE(f->pktNextRecvSeq));
        !           123: 
        !           124:     if (BETWEEN(sp->sendSeq, PktNextRecvSeq, sp->sendWdwSeq+1)) {
        !           125:        struct adspcmd *pb;
        !           126: 
        !           127:        RemoveTimerElem(&adspGlobal.fastTimers, &sp->ResetTimer); 
        !           128:                                /* Remove timer */
        !           129: 
        !           130:        /*
        !           131:         * Interrupts are OFF here while we muck with the linked list
        !           132:         */
        !           133:        pb = sp->frpb;          /* Unlink copy of user's parameter block */
        !           134:        sp->frpb = (struct adspcmd *)pb->qLink;
        !           135: 
        !           136:        pb->ioResult = 0;
        !           137:        completepb(sp, pb);     /* complete(pb, 0); */
        !           138:                
        !           139:        if (sp->state == sClosing) /* this ack may allow us to close... */
        !           140:            CheckOkToClose(sp);
        !           141:                        
        !           142:        if (sp->frpb)           /* Another to send? */
        !           143:        {
        !           144:            sp->callSend = 1;
        !           145:            sp->sendCtl |= B_CTL_FRESET;
        !           146:        }
        !           147:     }
        !           148: 
        !           149:     ATENABLE(s, sp->lock);
        !           150:     return 0;
        !           151: }
        !           152: 
        !           153: 
        !           154: /*
        !           155:  * dspReset
        !           156:  * 
        !           157:  * INPUTS:
        !           158:  *     --> ccbRefNum           refnum of connection end
        !           159:  *
        !           160:  * OUTPUTS:
        !           161:  *     none
        !           162:  *
        !           163:  * ERRORS:
        !           164:  *     errRefNum               bad connection refnum
        !           165:  *     errState                connection is not open
        !           166:  *     errAborted              request aborted by Remove or Close call
        !           167:  */
        !           168: int adspReset(sp, pb)          /* (DSPPBPtr pb) */
        !           169:     CCBPtr sp;
        !           170:     struct adspcmd *pb;
        !           171: {
        !           172:     int s;
        !           173:     OSErr err;
        !           174:     struct adspcmd *qhead;
        !           175:     register gbuf_t *mp;
        !           176:     register struct adspcmd *rpb;
        !           177:        
        !           178:     if (sp == 0) {
        !           179:        pb->ioResult = errRefNum;
        !           180:        return EINVAL;
        !           181:     }
        !           182: 
        !           183:     if (sp->state != sOpen) {
        !           184:        pb->ioResult = errState;
        !           185:        return EINVAL;
        !           186:     }
        !           187:        
        !           188:     ATDISABLE(s, sp->lock);
        !           189: 
        !           190:     while (mp = sp->sbuf_mb) { /* clear the send queue */
        !           191:        sp->sbuf_mb = gbuf_next(mp);
        !           192:        gbuf_freem(mp);
        !           193:     }
        !           194:     if (sp->csbuf_mb) {
        !           195:        gbuf_freem(sp->csbuf_mb);
        !           196:        sp->csbuf_mb = 0;
        !           197:     }
        !           198:     sp->sData = 0;
        !           199:     sp->writeFlush = 0;
        !           200:     sp->sendCtl |= B_CTL_FRESET;
        !           201: 
        !           202:     sp->firstRtmtSeq = sp->sendSeq; /* Reset sequence #'s */
        !           203:     if (mp = gbuf_copym(pb->mp)) {     /* copy the parameter block */
        !           204:            adspioc_ack(0, pb->ioc, pb->gref); /* release user */
        !           205:            rpb = (struct adspcmd *)gbuf_rptr(mp);
        !           206:            rpb->ioc = 0;               /* unlink copy */
        !           207:            rpb->mp = mp;
        !           208: 
        !           209:            qAddToEnd(&sp->frpb, rpb); 
        !           210:                                /* Hold on to pb (will be completed when */
        !           211:                                /* forward reset ack is received). */
        !           212:     } else {                   /* assume it will work... but keep no
        !           213:                                 * bookkeeping for it.  yetch! */
        !           214:            adspioc_ack(0, pb->ioc, pb->gref);
        !           215:     }
        !           216:     ATENABLE(s, sp->lock);
        !           217: 
        !           218:     CheckSend(sp);
        !           219:     return STR_IGNORE;
        !           220: 
        !           221: }

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