src/target/firmware/comm/msgb.c

   1 /* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
   2  * All Rights Reserved
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  */
  15
  16
  17 #include <stdint.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <sys/types.h>
  21 #include <asm/system.h>
  22
  23 #include <debug.h>
  24 #include <delay.h>
  25 #include <console.h>
  26
  27 #include <osmocom/core/msgb.h>
  28
  29 #define NO_TALLOC
  30
  31 #ifdef NO_TALLOC
  32 /* This is a poor mans static allocator for msgb objects */
  33 #define MSGB_DATA_SIZE  256+4
  34 #define MSGB_NUM        32
  35 struct supermsg {
  36         uint8_t allocated;
  37         struct msgb msg;
  38         uint8_t buf[MSGB_DATA_SIZE];
  39 };
  40 static struct supermsg msgs[MSGB_NUM];
  41 void *_talloc_zero(void *ctx, unsigned int size, const char *name)
  42 {
  43         unsigned long flags;
  44         unsigned int i;
  45
  46         local_firq_save(flags);
  47
  48         if (size > sizeof(struct msgb) + MSGB_DATA_SIZE)
  49                 goto panic;
  50
  51         for (i = 0; i < ARRAY_SIZE(msgs); i++) {
  52                 if (!msgs[i].allocated) {
  53                         msgs[i].allocated = 1;
  54                         memset(&msgs[i].msg, 0, sizeof(msgs[i].msg));
  55                         memset(&msgs[i].buf, 0, sizeof(msgs[i].buf));
  56                         local_irq_restore(flags);
  57                         return &msgs[i].msg;
  58                 }
  59         }
  60
  61 panic:
  62         cons_puts("unable to allocate msgb\n");
  63         while (1);
  64
  65         return NULL; /* not reached */
  66 }
  67 void talloc_free(void *msg)
  68 {
  69         struct supermsg *smsg = container_of(msg, struct supermsg, msg);
  70         /* no locking required, since this is atomic */
  71         smsg->allocated = 0;
  72 }
  73 #endif