include/qemu/module.h

   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 #ifndef QEMU_MODULE_H
  15 #define QEMU_MODULE_H
  16
  17 #include "qemu/osdep.h"
  18
  19 #define DSO_STAMP_FUN         glue(qemu_stamp, CONFIG_STAMP)
  20 #define DSO_STAMP_FUN_STR     stringify(DSO_STAMP_FUN)
  21
  22 #ifdef BUILD_DSO
  23 void DSO_STAMP_FUN(void);
  24 /* This is a dummy symbol to identify a loaded DSO as a QEMU module, so we can
  25  * distinguish "version mismatch" from "not a QEMU module", when the stamp
  26  * check fails during module loading */
  27 void qemu_module_dummy(void);
  28
  29 #define module_init(function, type)                                         \
  30 static void __attribute__((constructor)) do_qemu_init_ ## function(void)    \
  31 {                                                                           \
  32     register_dso_module_init(function, type);                               \
  33 }
  34 #else
  35 /* This should not be used directly.  Use block_init etc. instead.  */
  36 #define module_init(function, type)                                         \
  37 static void __attribute__((constructor)) do_qemu_init_ ## function(void)    \
  38 {                                                                           \
  39     register_module_init(function, type);                                   \
  40 }
  41 #endif
  42
  43 typedef enum {
  44     MODULE_INIT_BLOCK,
  45     MODULE_INIT_MACHINE,
  46     MODULE_INIT_QAPI,
  47     MODULE_INIT_QOM,
  48     MODULE_INIT_MAX
  49 } module_init_type;
  50
  51 #define block_init(function) module_init(function, MODULE_INIT_BLOCK)
  52 #define machine_init(function) module_init(function, MODULE_INIT_MACHINE)
  53 #define qapi_init(function) module_init(function, MODULE_INIT_QAPI)
  54 #define type_init(function) module_init(function, MODULE_INIT_QOM)
  55
  56 void register_module_init(void (*fn)(void), module_init_type type);
  57 void register_dso_module_init(void (*fn)(void), module_init_type type);
  58
  59 void module_call_init(module_init_type type);
  60
  61 #endif