Subversion Repositories openrisc

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos 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 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

#include <cyg/devs/eth/nbuf.h>

/*

 * Functions to manipulate the network buffers.

 */

#include <cyg/hal/hal_intr.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/devs/eth/if_mcf5272.h>

#include <cyg/devs/eth/nbuf.h>

#include <cyg/infra/cyg_ass.h>

/*******************************************************************************

nbuf_init() - Initalize the networ buffers.

INPUT: pBuf - Pointer to the network buffer data.

*/

void

nbuf_init (buf_info_t* pBuf)

{

        uint_t i = 0;

    uint8 *buf = (uint8*)&(pBuf->RxBuffer);

    buf = (uint8*)((((uint32)buf+15)/16)*16);

    /* Initialize RxNBUF and TxNBUF */

    pBuf->RxNBUF = (NBUF*)((((uint32)(&pBuf->nrxbuf[0])+3)/4)*4);

    pBuf->TxNBUF = (NBUF*)((((uint32)(&pBuf->ntxbuf[0])+3)/4)*4);

        /* Initialize receive descriptor ring */

        for (i = 0; i < NUM_RXBDS; i++)

        {

                pBuf->RxNBUF[i].status = RX_BD_E;

                pBuf->RxNBUF[i].length = 0;

                pBuf->RxNBUF[i].data = buf;

        buf += RX_BUFFER_SIZE;

        }

        /* Set the Wrap bit on the last one in the ring */

        pBuf->RxNBUF[NUM_RXBDS - 1].status |= RX_BD_W;

        /* Initialize transmit descriptor ring */

        for (i = 0; i < NUM_TXBDS; i++)

        {

                pBuf->TxNBUF[i].length = 0;

                pBuf->TxNBUF[i].data = 0L;

        pBuf->TxNBUF[i].status = 0;

        }

        /* Set the Wrap bit on the last one in the ring */

        pBuf->TxNBUF[NUM_TXBDS - 1].status |= TX_BD_W;

        /* Initialize the buffer descriptor indexes */

        pBuf->iTxbd = pBuf->iRxbd = 0;

    /* Intiaize the transmit key queue to zero. */

    pBuf->tq_front = pBuf->tq_rear = 0;

    // Initalize the nubmer of transmit buffer descriptors used to zero.

    pBuf->num_busy_bd = 0;

}