lora-irrigation/sysinit.h

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1995 Terrence R. Lambert
 * Copyright 2022 John-Mark Gurney
 * All rights reserved.
 *
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)kernel.h    8.3 (Berkeley) 1/21/94
 * $FreeBSD$
 */

/*
 * This system is similar to FreeBSD's SYSINIT(9), but w/ minor
 * modifications.
 */

#ifndef _SYSINIT_H_
#define _SYSINIT_H_ 1

#include <linker_set.h>

/* from FreeBSD sys/systm.h */
#define CTASSERT(x)     _Static_assert(x, "compile-time assertion failed")

#define MAKE_SUBORDER(subsys, order)	((uint32_t)((subsys) << 16) | (order))
#define GET_SUBSYS(x)			(((x) >> 16) & 0xffff)
#define GET_ORDER(x)			((x) & 0xffff)

enum sysinit_sub_id {
	SI_SUB_DUMMY		= 0x0000,	/* not executed; for linker*/

	SI_SUB_HAL		= 0x0010,	/* Early HAL init */
	SI_SUB_GPIO		= 0x0030,	/* Early GPIO */
	SI_SUB_CONSOLE		= 0x0700,	/* Setup console/debug prints */

	SI_SUB_COPYRIGHT	= 0x0800,	/* start of when printf works */

	SI_SUB_STANDARD		= 0x8000,	/* standard later initalization */

	SI_SUB_LAST		= 0xffff	/* final initialization */
};

/*
 * Some enumerated orders; "ANY" sorts last.
 */
enum sysinit_elem_order {
	SI_ORDER_FIRST		= 0x0000,	/* first*/
	SI_ORDER_SECOND		= 0x0001,	/* second*/
	SI_ORDER_THIRD		= 0x0002,	/* third*/
	SI_ORDER_FOURTH		= 0x0003,	/* fourth*/
	SI_ORDER_FIFTH		= 0x0004,	/* fifth*/
	SI_ORDER_SIXTH		= 0x0005,	/* sixth*/
	SI_ORDER_SEVENTH	= 0x0006,	/* seventh*/
	SI_ORDER_EIGHTH		= 0x0007,	/* eighth*/
	SI_ORDER_MIDDLE		= 0x1000,	/* somewhere in the middle */
	SI_ORDER_ANY		= 0xffff	/* last*/
};

typedef void (*sysinit_cfunc_t)(const void *);

struct sysinit {
	uint32_t	si_subsys_order;
	sysinit_cfunc_t	si_func;
	const void	*si_udata;
};

#define SYSINIT(uniquifier, subsystem, order, func, udata)		\
	CTASSERT((subsystem & 0xffff) == subsystem);			\
	CTASSERT((order & 0xffff) == order);				\
	static struct sysinit uniquifier ## _sys_init = {		\
		.si_subsys_order = MAKE_SUBORDER((subsystem), (order)),	\
		.si_func = (func),					\
		.si_udata = (udata),					\
	};								\
	DATA_SET(sysinit_set,uniquifier ## _sys_init)

void sysinit_run(void);

#endif /* _SYSINIT_H_ */