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

//

//      net/enet.c

//

//      Stand-alone ethernet [link-layer] support for RedBoot

//

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

// ####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####                                              

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

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-07-14

// Purpose:      

// Description:  

//              

// This code is part of RedBoot (tm).

//

//####DESCRIPTIONEND####

//

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

#include <redboot.h>

#include <net/net.h>

#include <cyg/io/eth/eth_drv.h>       // Logical driver interfaces

//#define ENET_STATS 1

#ifdef ENET_STATS

static int num_ip = 0;

static int num_arp = 0;

#ifdef NET_SUPPORT_RARP

static int num_rarp = 0;

#endif

static int num_received = 0;

static int num_transmitted = 0;

#endif

//

// Support for user handlers of additional ethernet packets (nonIP)

//

#define NUM_EXTRA_HANDLERS 4

static struct {

    int type;

    pkt_handler_t handler;

} eth_handlers[NUM_EXTRA_HANDLERS];

pkt_handler_t

__eth_install_listener(int eth_type, pkt_handler_t handler)

{

    int i, empty;

    pkt_handler_t old;

    if (eth_type > 0x800 || handler != (pkt_handler_t)0) {

        empty = -1;

        for (i = 0;  i < NUM_EXTRA_HANDLERS;  i++) {

            if (eth_handlers[i].type == eth_type) {

                // Replace existing handler

                old = eth_handlers[i].handler;

                eth_handlers[i].handler = handler;

                return old;

            }

            if (eth_handlers[i].type == 0) {

                empty = i;

            }

        }

        if (empty >= 0) {

            // Found a free slot

            eth_handlers[empty].type = eth_type;

            eth_handlers[empty].handler = handler;

            return (pkt_handler_t)0;

        }

    }

    diag_printf("** Warning: can't install listener for ethernet type 0x%02x\n", eth_type);

    return (pkt_handler_t)0;

}

void

__eth_remove_listener(int eth_type)

{

    int i;

    for (i = 0;  i < NUM_EXTRA_HANDLERS;  i++) {

        if (eth_handlers[i].type == eth_type) {

            eth_handlers[i].type = 0;

        }

    }

}

/*

 * Non-blocking poll of ethernet link. Process packets until no more

 * are available.

 */

void

__enet_poll(void)

{

    pktbuf_t *pkt;

    eth_header_t eth_hdr;

    int i, type;

#ifdef DEBUG_PKT_EXHAUSTION

    static bool was_exhausted = false;

#endif

    while (true) {

        /*

         * Try to get a free pktbuf and return if none

         * are available.

         */

        if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) {

#ifdef DEBUG_PKT_EXHAUSTION

            if (!was_exhausted) {

                int old = start_console();  // Force output to standard port

                diag_printf("__enet_poll: no more buffers\n");

                __pktbuf_dump();

                was_exhausted = true;

                end_console(old);

            }

#endif

            return;

        }

#ifdef DEBUG_PKT_EXHAUSTION

        was_exhausted = false;  // Report the next time we're out of buffers

#endif

        if ((pkt->pkt_bytes = eth_drv_read((char *)&eth_hdr, (char *)pkt->buf,

                                           ETH_MAX_PKTLEN)) > 0) {

#ifdef ENET_STATS

            ++num_received;

#endif

            switch (type = ntohs(eth_hdr.type)) {

            case ETH_TYPE_IP:

#ifdef ENET_STATS

                ++num_ip;

#endif

                pkt->ip_hdr = (ip_header_t *)pkt->buf;

                __ip_handler(pkt, &eth_hdr.source);

                break;

            case ETH_TYPE_ARP:

#ifdef ENET_STATS

                ++num_arp;

#endif

                pkt->arp_hdr = (arp_header_t *)pkt->buf;

                __arp_handler(pkt);

                break;

#ifdef NET_SUPPORT_RARP

            case ETH_TYPE_RARP:

#ifdef ENET_STATS

                ++num_rarp;

#endif

                pkt->arp_hdr = (arp_header_t *)pkt->buf;

                __rarp_handler(pkt);

                break;

#endif

            default:

                if (type > 0x800) {

                    for (i = 0;  i < NUM_EXTRA_HANDLERS;  i++) {

                        if (eth_handlers[i].type == type) {

                            (eth_handlers[i].handler)(pkt, &eth_hdr);

                        }

                    }

                }

                __pktbuf_free(pkt);

                break;

            }

        } else {

            __pktbuf_free(pkt);

            break;

        }

    }

}

/*

 * Send an ethernet packet.

 */

void

__enet_send(pktbuf_t *pkt, enet_addr_t *dest, int eth_type)

{

    eth_header_t eth_hdr;

    // Set up ethernet header

    memcpy(&eth_hdr.destination, dest, sizeof(enet_addr_t));

    memcpy(&eth_hdr.source, __local_enet_addr, sizeof(enet_addr_t));

    eth_hdr.type = htons(eth_type);

    eth_drv_write((char *)&eth_hdr, (char *)pkt->buf, pkt->pkt_bytes);

#ifdef ENET_STATS

    ++num_transmitted;

#endif

}

#ifdef __LITTLE_ENDIAN__

unsigned long

ntohl(unsigned long x)

{

    return (((x & 0x000000FF) << 24) |

            ((x & 0x0000FF00) <<  8) |

            ((x & 0x00FF0000) >>  8) |

            ((x & 0xFF000000) >> 24));

}

unsigned short

ntohs(unsigned short x)

{

    return (((x & 0x00FF) << 8) |

            ((x & 0xFF00) >> 8));

}

#endif