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PCSED.C
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1994-11-28
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3KB
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122 lines
/*
* Ethernet Driver Routines
*
* The TCP code uses Ethernet constants for protocol numbers and 48 bits
* for address. Also, 0xffffffffffff is assumed to be a broadcast.
*
* If you need to write a new driver, implement it at this level and use
* the above mentioned constants as this program's constants, not device
* dependant constants.
*
* The packet driver code lies below this and really ought to be rewritten
* in assembly language.
*
* _eth_addr - Ethernet address of this host.
* _eth_brdcast - Ethernet broadcast address.
*/
#include <copyright.h>
#include <wattcp.h>
#include <ethdev.h>
#include <mem.h>
eth_address _eth_addr; /* local ethernet address */
eth_address _eth_brdcast; /* Ethernet broadcast address */
word _pktdevclass = 1; /* Ethernet = 1, SLIP = 6 */
/*
* Initialize the Ethernet Interface, and this package. Enable input on
* all packet buffers.
*/
void _eth_init(void)
{
movmem( _pkt_eth_init() , &_eth_addr, 6 );
memset( &_eth_brdcast, 0xff, sizeof( _eth_brdcast ));
}
/*
* _eth_FormatPacket places the next packet into the buffer and uses the
* type field for protocol determination. Note, I only maintain a single
* output buffer, and it gets used quickly then released. The benefits of
* non-blocking systems are immense.
*/
static struct ether outbuf;
//byte *_eth_formatpacket( void *eth_dest, word eth_type )
byte *_eth_formatpacket( eth_address *eth_dest, word eth_type ) // 94.11.19
{
memset( &outbuf, 0, sizeof(struct ether));
switch ( _pktdevclass ) {
case PD_SLIP :
return( (byte *) &outbuf ); /* no header */
case PD_ETHER :
default: /* should never catch default case */
movmem( eth_dest, outbuf.dest, 6 );
movmem( &_eth_addr, outbuf.src, 6 );
outbuf.type = eth_type;
return( (byte *)&outbuf.data );
}
}
/*
* _eth_send does the actual transmission once we are complete with the
* buffer. Do any last minute patches here, like fix the size.
*/
int _eth_send( word len )
{
if (( _pktdevclass == PD_ETHER ) && ((len += 14) < ETH_MIN ))
len = ETH_MIN;
return( pkt_send( (char *)&outbuf, len )); /* send to packet driver */
}
/*
* _eth_free - free an input buffer once it is no longer needed
* If pointer to NULL, release all buffers
*/
void _eth_free( void *buf )
{
if ( buf )
pkt_buf_release( buf );
else
pkt_buf_wipe();
}
/*
* _eth_arrived - if a new packet has arrived, read it and fill pointer
* with type of packet
*/
byte *_eth_arrived( word *type_ptr )
{
struct ether * temp;
if ((temp = (struct ether * ) pkt_received()) != NULL ) {
switch ( _pktdevclass ) {
case PD_ETHER : *type_ptr = temp->type;
return( temp->data );
case PD_SLIP : *type_ptr = 0x008;
return( (byte *) temp );
}
}
return( NULL );
}
/*
* _eth_release - release the hardware
*/
void _eth_release( void )
{
pkt_release();
}
/*
* _eth_hardware - return pointer to hardware address of a packet
*/
void *_eth_hardware( byte *p )
{
return( p - 8 );
}