156 lines
4.9 KiB
C
156 lines
4.9 KiB
C
/* microkernel/k_chstr.h */
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/*
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* Copyright (c) 1997-2012, 2015 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _K_CHANSTRUCT_H
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#define _K_CHANSTRUCT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MAXNBR_MARKERS 10 /* 1==disable parallel transfers */
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struct marker {
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unsigned char *pointer; /* NULL == non valid marker == free */
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int size;
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BOOL bXferBusy;
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int Prev; /* -1 == no predecessor */
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int Next; /* -1 == no successor */
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};
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struct marker_list {
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int iNbrMarkers; /* Only used if STORE_NBR_MARKERS is defined */
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int iFirstMarker;
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int iLastMarker;
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int iAWAMarker; /* -1 means no AWAMarkers */
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struct marker aMarkers[MAXNBR_MARKERS];
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};
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typedef enum {
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BUFF_EMPTY, /* buffer is empty, disregarding the pending data Xfers
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(reads) still finishing up */
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BUFF_FULL, /* buffer is full, disregarding the pending data Xfers
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(writes) still finishing up */
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BUFF_OTHER
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} BUFF_STATE;
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struct chbuff {
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int iBuffSize;
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unsigned char *pBegin;
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unsigned char *pWrite;
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unsigned char *pRead;
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unsigned char *pWriteGuard; /* can be NULL --> invalid */
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unsigned char *pReadGuard; /* can be NULL --> invalid */
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int iFreeSpaceCont;
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int iFreeSpaceAWA;
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int iNbrPendingReads;
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int iAvailDataCont;
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int iAvailDataAWA; /* AWA == After Wrap Around */
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int iNbrPendingWrites;
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BOOL bWriteWA;
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BOOL bReadWA;
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BUFF_STATE BuffState;
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struct marker_list WriteMarkers;
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struct marker_list ReadMarkers;
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unsigned char *pEnd;
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unsigned char *pEndOrig;
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};
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/* exported functions */
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void BuffInit(unsigned char *pBuffer, int *piBuffSize, struct chbuff *pChBuff);
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void BuffReset(struct chbuff *pBuff);
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void BuffGetFreeSpaceTotal(struct chbuff *pBuff, int *piTotalFreeSpace);
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void BuffGetFreeSpace(struct chbuff *pBuff,
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int *piTotalFreeSpace,
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int *piFreeSpaceCont,
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int *piFreeSpaceAWA);
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void BuffGetAvailDataTotal(struct chbuff *pBuff, int *piAvailDataTotal);
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void BuffGetAvailData(struct chbuff *pBuff,
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int *piAvailDataTotal,
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int *piAvailDataCont,
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int *piAvailDataAWA);
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int BuffEnQ(struct chbuff *pBuff, int iSize, unsigned char **ppWrite);
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int BuffEnQA(struct chbuff *pBuff,
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int iSize,
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unsigned char **ppWrite,
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int *piTransferID);
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void BuffEnQA_End(struct chbuff *pBuff, int iTransferID, int iSize /* optional */);
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int BuffDeQ(struct chbuff *pBuff, int iSize, unsigned char **ppRead);
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int BuffDeQA(struct chbuff *pBuff,
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int iSize,
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unsigned char **ppRead,
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int *piTransferID);
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void BuffDeQA_End(struct chbuff *pBuff, int iTransferID, int iSize /* optional */);
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/* internal functions */
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void WriteMarkersClear(struct chbuff *pBuff);
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void ReadMarkersClear(struct chbuff *pBuff);
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int AsyncEnQRegstr(struct chbuff *pBuff, int iSize);
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int AsyncDeQRegstr(struct chbuff *pBuff, int iSize);
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void AsyncEnQFinished(struct chbuff *pBuff, int iTransferID);
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void AsyncDeQFinished(struct chbuff *pBuff, int iTransferID);
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int CalcAvailData(struct chbuff *pBuff, int *piDataAvailCont, int *piDataAvailAWA);
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int CalcFreeSpace(struct chbuff *pBuff, int *piFreeSpaceCont, int *piFreeSpaceAWA);
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void WriteMarkersClear(struct chbuff *pBuff);
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void ReadMarkersClear(struct chbuff *pBuff);
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int ScanMarkers(struct marker_list *pMarkerList,
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int *iSizeBWA,
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int *pisizeAWA,
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int *piNbrPendingXfers);
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int BuffFull(struct chbuff *pBuff);
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int BuffEmpty(struct chbuff *pBuff);
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void ChannelCheck4Intrusion(struct chbuff *pChBuff, unsigned char *pBegin, int iSize);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _K_CHANSTRUCT_H */
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