xref: /freebsd/sys/arm/include/runq.h (revision 60d717baf2144cf344ec9b47d715ce837b5d46d4)
1  /*-
2   * SPDX-License-Identifier: BSD-2-Clause
3   *
4   * Copyright (c) 2001 Jake Burkholder <jake@FreeBSD.org>
5   * All rights reserved.
6   *
7   * Redistribution and use in source and binary forms, with or without
8   * modification, are permitted provided that the following conditions
9   * are met:
10   * 1. Redistributions of source code must retain the above copyright
11   *    notice, this list of conditions and the following disclaimer.
12   * 2. Redistributions in binary form must reproduce the above copyright
13   *    notice, this list of conditions and the following disclaimer in the
14   *    documentation and/or other materials provided with the distribution.
15   *
16   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26   * SUCH DAMAGE.
27   */
28  
29  #ifndef	_MACHINE_RUNQ_H_
30  #define	_MACHINE_RUNQ_H_
31  
32  #define	RQB_LEN		(2)		/* Number of priority status words. */
33  #define	RQB_L2BPW	(5)		/* Log2(sizeof(rqb_word_t) * NBBY)). */
34  #define	RQB_BPW		(1<<RQB_L2BPW)	/* Bits in an rqb_word_t. */
35  
36  #define	RQB_BIT(pri)	(1 << ((pri) & (RQB_BPW - 1)))
37  #define	RQB_WORD(pri)	((pri) >> RQB_L2BPW)
38  
39  #define	RQB_FFS(word)	(ffs(word) - 1)
40  
41  /*
42   * Type of run queue status word.
43   */
44  typedef	u_int32_t	rqb_word_t;
45  
46  #endif
47