xref: /freebsd/sys/amd64/include/pcpu_aux.h (revision 20bd59416dcacbd2b776fe49dfa193900f303287)
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 
47 extern struct pcpu *__pcpu;
48 extern struct pcpu temp_bsp_pcpu;
49 
50 static __inline __pure2 struct thread *
51 __curthread(void)
52 {
53 	struct thread *td;
54 
55 	__asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcpu,
56 	    pc_curthread)));
57 	return (td);
58 }
59 #define	curthread		(__curthread())
60 
61 static __inline __pure2 struct pcb *
62 __curpcb(void)
63 {
64 	struct pcb *pcb;
65 
66 	__asm("movq %%gs:%P1,%0" : "=r" (pcb) : "n" (offsetof(struct pcpu,
67 	    pc_curpcb)));
68 	return (pcb);
69 }
70 #define	curpcb		(__curpcb())
71 
72 #endif	/* _MACHINE_PCPU_AUX_H_ */
73