Remove all remaining SPL code. Replace the mtd_cpl field in the machine
[dragonfly.git] / sys / platform / pc32 / include / thread.h
CommitLineData
f1d1c3fa 1/*
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2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
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7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
8c10bfcf 10 *
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11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
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14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
85100692 32 * SUCH DAMAGE.
8c10bfcf 33 *
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34 * Machine independant code should not directly include this file.
35 *
38787eef 36 * $DragonFly: src/sys/platform/pc32/include/thread.h,v 1.13 2005/06/16 21:12:46 dillon Exp $
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37 */
38
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39#ifndef _MACHINE_THREAD_H_
40#define _MACHINE_THREAD_H_
41
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42#include "segments.h"
43
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44union savefpu;
45
85100692 46struct md_thread {
38787eef 47 unsigned int mtd_unused; /* used to be mtd_cpl */
65d6ce10 48 union savefpu *mtd_savefpu;
806bf111 49 struct segment_descriptor mtd_tls[NGTLS];
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50};
51
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52#ifdef _KERNEL
53
65d6ce10 54#define td_savefpu td_mach.mtd_savefpu
806bf111 55#define td_tls td_mach.mtd_tls
8f41e33b 56
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57/*
58 * mycpu() retrieves the base of the current cpu's globaldata structure.
59 * Note that it is *NOT* volatile, meaning that the value may be cached by
60 * GCC. We have to force a dummy memory reference so gcc does not cache
61 * the gd pointer across a procedure call (which might block and cause us
62 * to wakeup on a different cpu).
63 *
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64 * Also note that in DragonFly a thread can be preempted, but only by an
65 * interrupt thread and the original thread will resume after the
66 * interrupt thread finishes or blocks. A thread cannot move to another
67 * cpu preemptively or at all, in fact, while you are in the kernel, even
68 * if you block.
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69 */
70
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71struct globaldata;
72
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73extern int __mycpu__dummy;
74
75static __inline
76struct globaldata *
77_get_mycpu(void)
78{
79 struct globaldata *gd;
80
81 __asm ("movl %%fs:globaldata,%0" : "=r" (gd) : "m"(__mycpu__dummy));
82 return(gd);
83}
84
e36ff5a2 85#define mycpu _get_mycpu()
577d2c04 86#define mycpuid _get_mycpu()->gd_cpuid
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87
88/*
89 * note: curthread is never NULL, but curproc can be. Also note that
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90 * that only processes really use the PCB. Threads fill in some fields
91 * but mostly store contextual data on the stack and do not use (much of)
92 * the PCB.
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93 */
94#define curthread mycpu->gd_curthread
95#define curproc curthread->td_proc
96
97#endif /* _KERNEL */
98
99#endif /* !_MACHINE_THREAD_H_ */