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/* $OpenBSD: packet.c,v 1.3 1996/04/26 18:23:07 mickey Exp $ */
/* $NetBSD: packet.c,v 1.4 1996/02/02 18:06:21 mycroft Exp $ */
/*
* source in this file came from
* the Mach ethernet boot written by Leendert van Doorn.
*
* Packet allocation and deallocation routines.
*
* Copyright (c) 1992 by Leendert van Doorn
*/
#include "proto.h"
#include "assert.h"
#include "param.h"
#include "packet.h"
static packet_t *pool = (packet_t *)0;
static packet_t *last;
void
PktInit(void) {
static packet_t s_pool[PKT_POOLSIZE];
pool = s_pool;
bzero((char *)pool, PKT_POOLSIZE * sizeof(packet_t));
last = pool;
}
packet_t *
PktAlloc(u_long offset) {
int i;
for (i = 0; i < PKT_POOLSIZE; i++) {
if (last->pkt_used == FALSE) {
bzero((char *)last->pkt_data, PKT_DATASIZE);
last->pkt_used = TRUE;
last->pkt_len = 0;
last->pkt_offset = last->pkt_data + offset;
#if 0
printf("PktAlloc: used %x\n", last);
#endif
return last;
}
if (++last == &pool[PKT_POOLSIZE])
last = pool;
}
printf("Pool out of free packets\n");
exit(1);
return 0; /* silence warnings */
}
void
PktRelease(packet_t *pkt) {
#if 0
printf("PktAlloc: freed %x\n", pkt);
#endif
assert(pkt >= &pool[0]);
assert(pkt < &pool[PKT_POOLSIZE]);
(last = pkt)->pkt_used = FALSE;
}
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