1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2003 David Xu <davidxu@freebsd.org>
5 * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Neither the name of the author nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32/*
33 * Machine-dependent thread prototypes/definitions.
34 */
35#ifndef _PTHREAD_MD_H_
36#define	_PTHREAD_MD_H_
37
38#include <stddef.h>
39#include <sys/types.h>
40#include <machine/sysarch.h>
41
42#define	CPU_SPINWAIT		__asm __volatile("pause")
43
44#define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
45
46/*
47 * Variant II tcb, first two members are required by rtld,
48 * %fs points to the structure.
49 */
50struct tcb {
51	struct tcb		*tcb_self;	/* required by rtld */
52	void			*tcb_dtv;	/* required by rtld */
53	struct pthread		*tcb_thread;
54	void			*tcb_spare[1];
55};
56
57/*
58 * Evaluates to the byte offset of the per-tcb variable name.
59 */
60#define	__tcb_offset(name)	__offsetof(struct tcb, name)
61
62/*
63 * Evaluates to the type of the per-tcb variable name.
64 */
65#define	__tcb_type(name)	__typeof(((struct tcb *)0)->name)
66
67/*
68 * Evaluates to the value of the per-tcb variable name.
69 */
70#define	TCB_GET64(name) ({					\
71	__tcb_type(name) __result;				\
72								\
73	u_long __i;						\
74	__asm __volatile("movq %%fs:%1, %0"			\
75	    : "=r" (__i)					\
76	    : "m" (*(volatile u_long *)(__tcb_offset(name))));  \
77	__result = (__tcb_type(name))__i;			\
78								\
79	__result;						\
80})
81
82static __inline void
83_tcb_set(struct tcb *tcb)
84{
85	amd64_set_fsbase(tcb);
86}
87
88static __inline struct tcb *
89_tcb_get(void)
90{
91	return (TCB_GET64(tcb_self));
92}
93
94static __inline struct pthread *
95_get_curthread(void)
96{
97	return (TCB_GET64(tcb_thread));
98}
99
100#define	HAS__UMTX_OP_ERR	1
101
102#endif
103