Forward FAST interrupts to the MP lock holder + minor fixes.
[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 $
a2a5ad0d 38 * $DragonFly: src/sys/i386/include/Attic/cpu.h,v 1.7 2003/07/10 04:47:53 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 *
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71 * We do not have to use a locked bus cycle but we do have to use an
72 * atomic instruction because an interrupt on the local cpu can modify
73 * the field.
984263bc 74 */
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75#define need_resched() \
76 atomic_set_int_nonlocked(&mycpu->gd_astpending, AST_RESCHED|AST_PENDING)
77#define clear_resched() \
78 atomic_clear_int_nonlocked(&mycpu->gd_astpending, AST_RESCHED)
3020e3be 79#define resched_wanted() (mycpu->gd_astpending & AST_RESCHED)
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80
81/*
82 * Arrange to handle pending profiling ticks before returning to user mode.
83 *
84 * XXX this is now poorly named and implemented. It used to handle only a
85 * single tick and the P_OWEUPC flag served as a counter. Now there is a
86 * counter in the proc table and flag isn't really necessary.
87 */
88#define need_proftick(p) \
89 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0)
90
91/*
92 * Notify the current process (p) that it has a signal pending,
93 * process as soon as possible.
94 *
95 * XXX: aston() really needs to be an atomic (not locked, but an orl),
96 * in case need_resched() is set by an interrupt. But with astpending a
97 * per-cpu variable this is not trivial to do efficiently. For now we blow
98 * it off (asynchronous need_resched() conflicts are not critical).
99 */
100#define signotify(p) aston()
101
3020e3be 102#define aston() do { mycpu->gd_astpending |= AST_PENDING; } while (0)
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103#define astoff()
104
105/*
106 * CTL_MACHDEP definitions.
107 */
108#define CPU_CONSDEV 1 /* dev_t: console terminal device */
109#define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
110#define CPU_DISRTCSET 3 /* int: disable resettodr() call */
111#define CPU_BOOTINFO 4 /* struct: bootinfo */
112#define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
113#define CPU_MAXID 6 /* number of valid machdep ids */
114
115#define CTL_MACHDEP_NAMES { \
116 { 0, 0 }, \
117 { "console_device", CTLTYPE_STRUCT }, \
118 { "adjkerntz", CTLTYPE_INT }, \
119 { "disable_rtc_set", CTLTYPE_INT }, \
120 { "bootinfo", CTLTYPE_STRUCT }, \
121 { "wall_cmos_clock", CTLTYPE_INT }, \
122}
123
124#ifdef _KERNEL
125extern char btext[];
126extern char etext[];
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127
128void fork_trampoline __P((void));
129void fork_return __P((struct proc *, struct trapframe));
130#endif
131
132#endif /* !_MACHINE_CPU_H_ */