The syncer is not a process any more, deal with it as a thread.
[dragonfly.git] / sys / i386 / include / cpu.h
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1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
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. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
37 * $FreeBSD: src/sys/i386/include/cpu.h,v 1.43.2.2 2001/06/15 09:37:57 scottl Exp $
b68b7282 38 * $DragonFly: src/sys/i386/include/Attic/cpu.h,v 1.6 2003/06/29 05:29:30 dillon Exp $
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39 */
40
41#ifndef _MACHINE_CPU_H_
42#define _MACHINE_CPU_H_
43
44/*
45 * Definitions unique to i386 cpu support.
46 */
47#include <machine/psl.h>
48#include <machine/frame.h>
49#include <machine/segments.h>
50
51/*
52 * definitions of cpu-dependent requirements
53 * referenced in generic code
54 */
55#undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
56
57#define cpu_exec(p) /* nothing */
58#define cpu_swapin(p) /* nothing */
59#define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap))
60
61#define CLKF_USERMODE(framep) \
62 ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
63
ef0fdad1 64#define CLKF_INTR(framep) (mycpu->gd_intr_nesting_level >= 2)
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65#define CLKF_PC(framep) ((framep)->cf_eip)
66
67/*
68 * Preempt the current process if in interrupt from user mode,
69 * or after the current trap/syscall if in system mode.
70 *
71 * XXX: if astpending is later changed to an |= here due to more flags being
72 * added, we will have an atomicy problem. The type of atomicy we need is
73 * a non-locked orl.
74 */
3020e3be 75#define need_resched() do { mycpu->gd_astpending = AST_RESCHED|AST_PENDING; } while (0)
8ad65e08 76#define clear_resched() do { mycpu->gd_astpending &= ~AST_RESCHED; } while(0)
3020e3be 77#define resched_wanted() (mycpu->gd_astpending & AST_RESCHED)
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78
79/*
80 * Arrange to handle pending profiling ticks before returning to user mode.
81 *
82 * XXX this is now poorly named and implemented. It used to handle only a
83 * single tick and the P_OWEUPC flag served as a counter. Now there is a
84 * counter in the proc table and flag isn't really necessary.
85 */
86#define need_proftick(p) \
87 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0)
88
89/*
90 * Notify the current process (p) that it has a signal pending,
91 * process as soon as possible.
92 *
93 * XXX: aston() really needs to be an atomic (not locked, but an orl),
94 * in case need_resched() is set by an interrupt. But with astpending a
95 * per-cpu variable this is not trivial to do efficiently. For now we blow
96 * it off (asynchronous need_resched() conflicts are not critical).
97 */
98#define signotify(p) aston()
99
3020e3be 100#define aston() do { mycpu->gd_astpending |= AST_PENDING; } while (0)
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101#define astoff()
102
103/*
104 * CTL_MACHDEP definitions.
105 */
106#define CPU_CONSDEV 1 /* dev_t: console terminal device */
107#define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
108#define CPU_DISRTCSET 3 /* int: disable resettodr() call */
109#define CPU_BOOTINFO 4 /* struct: bootinfo */
110#define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
111#define CPU_MAXID 6 /* number of valid machdep ids */
112
113#define CTL_MACHDEP_NAMES { \
114 { 0, 0 }, \
115 { "console_device", CTLTYPE_STRUCT }, \
116 { "adjkerntz", CTLTYPE_INT }, \
117 { "disable_rtc_set", CTLTYPE_INT }, \
118 { "bootinfo", CTLTYPE_STRUCT }, \
119 { "wall_cmos_clock", CTLTYPE_INT }, \
120}
121
122#ifdef _KERNEL
123extern char btext[];
124extern char etext[];
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125
126void fork_trampoline __P((void));
127void fork_return __P((struct proc *, struct trapframe));
128#endif
129
130#endif /* !_MACHINE_CPU_H_ */