pios_initcall.h

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/* 
 * This program is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 3 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, see <http://www.gnu.org/licenses/>
 */

#ifndef PIOS_INITCALL_H
#define PIOS_INITCALL_H

/* 
 * This implementation is heavily based on the Linux Kernel initcall
 * infrastructure:
 *   http://lxr.linux.no/#linux/include/linux/init.h
 *   http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=include/linux/init.h
 */

/*
 * Used for initialization calls..
 */

typedef int32_t (*initcall_t)(void);
typedef struct {
        initcall_t fn_minit;
        initcall_t fn_tinit;
} initmodule_t;

/* Init module section */
extern initmodule_t __module_initcall_start[], __module_initcall_end[];

/* initcalls are now grouped by functionality into separate 
 * subsections. Ordering inside the subsections is determined
 * by link order.
 *
 * The `id' arg to __define_initcall() is needed so that multiple initcalls
 * can point at the same handler without causing duplicate-symbol build errors.
 */

#define __define_module_initcall(level, ifn, sfn) \
        static initmodule_t __initcall_##fn __attribute__((__used__)) \
        __attribute__((__section__(".initcall." level))) = { .fn_minit = ifn, .fn_tinit = sfn };

#define MODULE_HIPRI_INITCALL(ifn, sfn)         __define_module_initcall("a_module", ifn, sfn)
#define MODULE_INITCALL(ifn, sfn)               __define_module_initcall("module", ifn, sfn)

#define MODULE_INITIALISE_ALL(wdgfn)  { \
                for (initmodule_t *fn = __module_initcall_start; fn < __module_initcall_end; fn++) { \
                        if (fn->fn_minit)                               \
                                (fn->fn_minit)();                       \
                        (wdgfn)();                                      \
                }                                                       \
        }

#define MODULE_TASKCREATE_ALL  { for (initmodule_t *fn = __module_initcall_start; fn < __module_initcall_end; fn++) \
                                                                        if (fn->fn_tinit) \
                                                                           (fn->fn_tinit)(); }

#endif  /* PIOS_INITCALL_H */