1/*-
 2 * SPDX-License-Identifier: BSD-2-Clause
 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
31#ifndef _MACHINE_PCPU_AUX_H_
32#define	_MACHINE_PCPU_AUX_H_
33
34#ifndef _KERNEL
35#error "Not for userspace"
36#endif
37
38#ifndef _SYS_PCPU_H_
39#error "Do not include machine/pcpu_aux.h directly"
40#endif
41
42/* Required for counters(9) to work on x86. */
43_Static_assert(sizeof(struct pcpu) == UMA_PCPU_ALLOC_SIZE, "fix pcpu size");
44
45extern struct pcpu __pcpu[];
46
47static __inline __pure2 struct thread *
48__curthread(void)
49{
50	struct thread *td;
51
52	__asm("movl %%fs:%1,%0" : "=r" (td)
53	    : "m" (*(char *)offsetof(struct pcpu, pc_curthread)));
54	return (td);
55}
56#define	curthread		(__curthread())
57
58static __inline __pure2 struct pcb *
59__curpcb(void)
60{
61	struct pcb *pcb;
62
63	__asm("movl %%fs:%1,%0" : "=r" (pcb)
64	    : "m" (*(char *)offsetof(struct pcpu, pc_curpcb)));
65	return (pcb);
66}
67#define	curpcb		(__curpcb())
68
69#endif	/* _MACHINE_PCPU_AUX_H_ */