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Annotation of Net2/arch/i386/netboot/packet.c, revision 1.1.1.1

1.1       root        1: /* netboot
                      2:  *
                      3:  * packet.c,v
                      4:  * Revision 1.1  1993/07/08  16:04:06  brezak
                      5:  * Diskless boot prom code from Jim McKim ([email protected])
                      6:  *
                      7:  * Revision 1.1.1.1  1993/05/28  11:41:07  mckim
                      8:  * Initial version.
                      9:  *
                     10:  *
                     11:  * source in this file came from
                     12:  * the Mach ethernet boot written by Leendert van Doorn.
                     13:  *
                     14:  * Packet allocation and deallocation routines.
                     15:  *
                     16:  * Copyright (c) 1992 by Leendert van Doorn
                     17:  */
                     18: #include "proto.h"
                     19: #include "assert.h"
                     20: #include "param.h"
                     21: #include "packet.h"
                     22: 
                     23: static packet_t *pool = (packet_t *)0;
                     24: static packet_t *last;
                     25: 
                     26: void
                     27: PktInit(void) {
                     28:   static packet_t s_pool[PKT_POOLSIZE];
                     29:   pool = s_pool;
                     30:   bzero((char *)pool, PKT_POOLSIZE * sizeof(packet_t));
                     31:   last = pool;
                     32: }
                     33: 
                     34: packet_t *
                     35: PktAlloc(u_long offset) {
                     36:   int i;
                     37: 
                     38:   for (i = 0; i < PKT_POOLSIZE; i++) {
                     39:     if (last->pkt_used == FALSE) {
                     40:       bzero((char *)last->pkt_data, PKT_DATASIZE);
                     41:       last->pkt_used = TRUE;
                     42:       last->pkt_len = 0;
                     43:       last->pkt_offset = last->pkt_data + offset;
                     44: #if 0
                     45: printf("PktAlloc: used %x\n", last);
                     46: #endif
                     47:       return last;
                     48:     }
                     49:     if (++last == &pool[PKT_POOLSIZE])
                     50:       last = pool;
                     51:   }
                     52:   printf("Pool out of free packets\n");
                     53:   exit(1);
                     54:   return 0; /* silence warnings */
                     55: }
                     56: 
                     57: void
                     58: PktRelease(packet_t *pkt) {
                     59: #if 0
                     60: printf("PktAlloc: freed %x\n", pkt);
                     61: #endif
                     62:     assert(pkt >= &pool[0]);
                     63:     assert(pkt < &pool[PKT_POOLSIZE]);
                     64:     (last = pkt)->pkt_used = FALSE;
                     65: }

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