60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/*
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* source in this file came from
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* the Mach ethernet boot written by Leendert van Doorn.
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*
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* Packet allocation and deallocation routines.
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*
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* Copyright (c) 1992 by Leendert van Doorn
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*
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* $Id: packet.c,v 1.2 1993/08/02 17:53:00 mycroft Exp $
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*/
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#include "proto.h"
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#include "assert.h"
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#include "param.h"
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#include "packet.h"
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static packet_t *pool = (packet_t *)0;
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static packet_t *last;
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void
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PktInit(void) {
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static packet_t s_pool[PKT_POOLSIZE];
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pool = s_pool;
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bzero((char *)pool, PKT_POOLSIZE * sizeof(packet_t));
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last = pool;
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}
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packet_t *
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PktAlloc(u_long offset) {
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int i;
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for (i = 0; i < PKT_POOLSIZE; i++) {
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if (last->pkt_used == FALSE) {
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bzero((char *)last->pkt_data, PKT_DATASIZE);
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last->pkt_used = TRUE;
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last->pkt_len = 0;
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last->pkt_offset = last->pkt_data + offset;
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#if 0
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printf("PktAlloc: used %x\n", last);
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#endif
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return last;
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}
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if (++last == &pool[PKT_POOLSIZE])
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last = pool;
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}
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printf("Pool out of free packets\n");
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exit(1);
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return 0; /* silence warnings */
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}
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void
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PktRelease(packet_t *pkt) {
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#if 0
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printf("PktAlloc: freed %x\n", pkt);
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#endif
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assert(pkt >= &pool[0]);
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assert(pkt < &pool[PKT_POOLSIZE]);
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(last = pkt)->pkt_used = FALSE;
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}
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