module.c

   1 /*
   2  * QEMU Module Infrastructure
   3  *
   4  * Copyright IBM, Corp. 2009
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "qemu-common.h"
  17 #include "qemu-queue.h"
  18 #include "module.h"
  19
  20 typedef struct ModuleEntry
  21 {
  22     module_init_type type;
  23     void (*init)(void);
  24     QTAILQ_ENTRY(ModuleEntry) node;
  25 } ModuleEntry;
  26
  27 typedef QTAILQ_HEAD(, ModuleEntry) ModuleTypeList;
  28
  29 static ModuleTypeList init_type_list[MODULE_INIT_MAX];
  30
  31 static void init_types(void)
  32 {
  33     static int inited;
  34     int i;
  35
  36     if (inited) {
  37         return;
  38     }
  39
  40     for (i = 0; i < MODULE_INIT_MAX; i++) {
  41         QTAILQ_INIT(&init_type_list[i]);
  42     }
  43
  44     inited = 1;
  45 }
  46
  47
  48 static ModuleTypeList *find_type(module_init_type type)
  49 {
  50     ModuleTypeList *l;
  51
  52     init_types();
  53
  54     l = &init_type_list[type];
  55
  56     return l;
  57 }
  58
  59 void register_module_init(void (*fn)(void), module_init_type type)
  60 {
  61     ModuleEntry *e;
  62     ModuleTypeList *l;
  63
  64     e = g_malloc0(sizeof(*e));
  65     e->init = fn;
  66
  67     l = find_type(type);
  68
  69     QTAILQ_INSERT_TAIL(l, e, node);
  70 }
  71
  72 void module_call_init(module_init_type type)
  73 {
  74     ModuleTypeList *l;
  75     ModuleEntry *e;
  76
  77     l = find_type(type);
  78
  79     QTAILQ_FOREACH(e, l, node) {
  80         e->init();
  81     }
  82 }