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  */
  13
  14 #include "qemu-common.h"
  15 #include "sys-queue.h"
  16 #include "module.h"
  17
  18 typedef struct ModuleEntry
  19 {
  20     module_init_type type;
  21     void (*init)(void);
  22     TAILQ_ENTRY(ModuleEntry) node;
  23 } ModuleEntry;
  24
  25 typedef TAILQ_HEAD(, ModuleEntry) ModuleTypeList;
  26
  27 static ModuleTypeList init_type_list[MODULE_INIT_MAX];
  28
  29 static void init_types(void)
  30 {
  31     static int inited;
  32     int i;
  33
  34     if (inited) {
  35         return;
  36     }
  37
  38     for (i = 0; i < MODULE_INIT_MAX; i++) {
  39         TAILQ_INIT(&init_type_list[i]);
  40     }
  41
  42     inited = 1;
  43 }
  44
  45
  46 static ModuleTypeList *find_type(module_init_type type)
  47 {
  48     ModuleTypeList *l;
  49
  50     init_types();
  51
  52     l = &init_type_list[type];
  53
  54     return l;
  55 }
  56
  57 void register_module_init(void (*fn)(void), module_init_type type)
  58 {
  59     ModuleEntry *e;
  60     ModuleTypeList *l;
  61
  62     e = qemu_mallocz(sizeof(*e));
  63     e->init = fn;
  64
  65     l = find_type(type);
  66
  67     TAILQ_INSERT_TAIL(l, e, node);
  68 }
  69
  70 void module_call_init(module_init_type type)
  71 {
  72     ModuleTypeList *l;
  73     ModuleEntry *e;
  74
  75     l = find_type(type);
  76
  77     TAILQ_FOREACH(e, l, node) {
  78         e->init();
  79     }
  80 }