1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2019 The FreeBSD Foundation
5 *
6 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
7 * under sponsorship from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33#ifndef _MACHINE_PCPU_AUX_H_
34#define	_MACHINE_PCPU_AUX_H_
35
36#ifndef _KERNEL
37#error "Not for userspace"
38#endif
39
40#ifndef _SYS_PCPU_H_
41#error "Do not include machine/pcpu_aux.h directly"
42#endif
43
44/* Required for counters(9) to work on x86. */
45_Static_assert(sizeof(struct pcpu) == UMA_PCPU_ALLOC_SIZE, "fix pcpu size");
46
47extern struct pcpu __pcpu[];
48
49static __inline __pure2 struct thread *
50__curthread(void)
51{
52	struct thread *td;
53
54	__asm("movl %%fs:%1,%0" : "=r" (td)
55	    : "m" (*(char *)offsetof(struct pcpu, pc_curthread)));
56	return (td);
57}
58#define	curthread		(__curthread())
59
60static __inline __pure2 struct pcb *
61__curpcb(void)
62{
63	struct pcb *pcb;
64
65	__asm("movl %%fs:%1,%0" : "=r" (pcb)
66	    : "m" (*(char *)offsetof(struct pcpu, pc_curpcb)));
67	return (pcb);
68}
69#define	curpcb		(__curpcb())
70
71#endif	/* _MACHINE_PCPU_AUX_H_ */
72