//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public 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;
}