com32/lib/syslinux/memscan.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
   4  *   Copyright 2009 H. Peter Anvin - All Rights Reserved
   5  *
   6  *   Permission is hereby granted, free of charge, to any person
   7  *   obtaining a copy of this software and associated documentation
   8  *   files (the "Software"), to deal in the Software without
   9  *   restriction, including without limitation the rights to use,
  10  *   copy, modify, merge, publish, distribute, sublicense, and/or
  11  *   sell copies of the Software, and to permit persons to whom
  12  *   the Software is furnished to do so, subject to the following
  13  *   conditions:
  14  *
  15  *   The above copyright notice and this permission notice shall
  16  *   be included in all copies or substantial portions of the Software.
  17  *
  18  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  20  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  22  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  24  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  *   OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * ----------------------------------------------------------------------- */
  28
  29 /*
  30  * memscan.c
  31  *
  32  * Query the system for free memory
  33  */
  34
  35 #include <syslinux/memscan.h>
  36
  37 static LIST_HEAD(syslinux_memscan_head);
  38
  39 /*
  40  * Add a memscan entry to the list.
  41  */
  42 void syslinux_memscan_add(struct syslinux_memscan *entry)
  43 {
  44     list_add(&entry->next, &syslinux_memscan_head);
  45 }
  46
  47 /*
  48  * Build a new memscan entry and add it to the list.
  49  */
  50 int syslinux_memscan_new(int func(scan_memory_callback_t, void *data))
  51 {
  52     struct syslinux_memscan *entry;
  53
  54     entry = malloc(sizeof *entry);
  55     if (!entry)
  56         return -1;
  57
  58     entry->func = func;
  59     syslinux_memscan_add(entry);
  60     return 0;
  61 }
  62
  63 int syslinux_scan_memory(scan_memory_callback_t callback, void *data)
  64 {
  65     struct syslinux_memscan *entry;
  66     int rv = 0;
  67
  68     list_for_each_entry(entry, &syslinux_memscan_head, next) {
  69         rv = entry->func(callback, data);
  70         if (rv)
  71             break;
  72     }
  73
  74     return rv;
  75 }