Fix comments.
[dragonfly.git] / lib / libthread_xu / arch / amd64 / include / pthread_md.h
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1/*-
2 * Copyright (C) 2003 David Xu <davidxu@freebsd.org>
3 * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Neither the name of the author nor the names of its contributors
12 * may be used to endorse or promote products derived from this software
13 * without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: src/lib/libpthread/arch/amd64/include/pthread_md.h,v 1.10 2004/08/25 23:42:40 davidxu Exp $
c59d3b91 28 * $DragonFly: src/lib/libthread_xu/arch/amd64/include/pthread_md.h,v 1.2 2005/03/15 11:26:34 davidxu Exp $
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29 */
30
31/*
32 * Machine-dependent thread prototypes/definitions for the thread kernel.
33 */
34#ifndef _PTHREAD_MD_H_
35#define _PTHREAD_MD_H_
36
37#include <stddef.h>
38#include <sys/types.h>
71b3fa15 39#include <machine/sysarch.h>
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40
41#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
42
43struct pthread;
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44
45/*
c59d3b91 46 * Variant II tcb, %fs points to the struct.
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47 */
48
49struct tcb {
50 struct tcb *tcb_self; /* required by rtld */
51 void *tcb_dtv; /* required by rtld */
52 struct pthread *tcb_thread;
53 void *tcb_spare[1]; /* align tcb_tmbx to 16 bytes */
54};
55
56/*
c59d3b91 57 * Evaluates to the byte offset of the per-tcb variable name.
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58 */
59#define __tcb_offset(name) __offsetof(struct tcb, name)
60
61/*
c59d3b91 62 * Evaluates to the type of the per-tcb variable name.
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63 */
64#define __tcb_type(name) __typeof(((struct tcb *)0)->name)
65
66/*
c59d3b91 67 * Evaluates to the value of the per-tcb variable name.
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68 */
69#define TCB_GET64(name) ({ \
70 __tcb_type(name) __result; \
71 \
72 u_long __i; \
73 __asm __volatile("movq %%fs:%1, %0" \
74 : "=r" (__i) \
75 : "m" (*(u_long *)(__tcb_offset(name)))); \
76 __result = (__tcb_type(name))__i; \
77 \
78 __result; \
79})
80
81/*
82 * The constructors.
83 */
84struct tcb *_tcb_ctor(struct pthread *, int);
85void _tcb_dtor(struct tcb *tcb);
86
87/* Called from the KSE to set its private data. */
88static __inline void
89_tcb_set(struct tcb *tcb)
90{
91 amd64_set_fsbase(tcb);
92}
93
94/* Get the current kcb. */
95static __inline struct tcb *
96_tcb_get(void)
97{
98 return (TCB_GET64(tcb_self));
99}
100
101extern struct pthread *_thr_initial;
102
103/* Get the current thread. */
104static __inline struct pthread *
105_get_curthread(void)
106{
107 if (_thr_initial)
108 return (TCB_GET64(tcb_thread));
109 return (NULL);
110}
111#endif