Initial import from FreeBSD RELENG_4:
[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 $
38 */
39
40#ifndef _MACHINE_CPU_H_
41#define _MACHINE_CPU_H_
42
43/*
44 * Definitions unique to i386 cpu support.
45 */
46#include <machine/psl.h>
47#include <machine/frame.h>
48#include <machine/segments.h>
49
50/*
51 * definitions of cpu-dependent requirements
52 * referenced in generic code
53 */
54#undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
55
56#define cpu_exec(p) /* nothing */
57#define cpu_swapin(p) /* nothing */
58#define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap))
59
60#define CLKF_USERMODE(framep) \
61 ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
62
63#define CLKF_INTR(framep) (intr_nesting_level >= 2)
64#if 0
65/*
66 * XXX splsoftclock() is very broken and barely worth fixing. It doesn't
67 * turn off the clock bit in imen or in the icu. (This is not a serious
68 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock()
69 * can take more than 62.5 usec so clock interrupts are lost.) It doesn't
70 * check for pending interrupts being unmasked. clkintr() and Xintr0()
71 * assume that the ipl is high when hardclock() returns. Our SWI_CLOCK
72 * handling is efficient enough that little is gained by calling
73 * softclock() directly.
74 */
75#define CLKF_BASEPRI(framep) ((framep)->cf_ppl == 0)
76#else
77#define CLKF_BASEPRI(framep) (0)
78#endif
79#define CLKF_PC(framep) ((framep)->cf_eip)
80
81/*
82 * Preempt the current process if in interrupt from user mode,
83 * or after the current trap/syscall if in system mode.
84 *
85 * XXX: if astpending is later changed to an |= here due to more flags being
86 * added, we will have an atomicy problem. The type of atomicy we need is
87 * a non-locked orl.
88 */
89#define need_resched() do { astpending = AST_RESCHED|AST_PENDING; } while (0)
90#define resched_wanted() (astpending & AST_RESCHED)
91
92/*
93 * Arrange to handle pending profiling ticks before returning to user mode.
94 *
95 * XXX this is now poorly named and implemented. It used to handle only a
96 * single tick and the P_OWEUPC flag served as a counter. Now there is a
97 * counter in the proc table and flag isn't really necessary.
98 */
99#define need_proftick(p) \
100 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0)
101
102/*
103 * Notify the current process (p) that it has a signal pending,
104 * process as soon as possible.
105 *
106 * XXX: aston() really needs to be an atomic (not locked, but an orl),
107 * in case need_resched() is set by an interrupt. But with astpending a
108 * per-cpu variable this is not trivial to do efficiently. For now we blow
109 * it off (asynchronous need_resched() conflicts are not critical).
110 */
111#define signotify(p) aston()
112
113#define aston() do { astpending |= AST_PENDING; } while (0)
114#define astoff()
115
116/*
117 * CTL_MACHDEP definitions.
118 */
119#define CPU_CONSDEV 1 /* dev_t: console terminal device */
120#define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
121#define CPU_DISRTCSET 3 /* int: disable resettodr() call */
122#define CPU_BOOTINFO 4 /* struct: bootinfo */
123#define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
124#define CPU_MAXID 6 /* number of valid machdep ids */
125
126#define CTL_MACHDEP_NAMES { \
127 { 0, 0 }, \
128 { "console_device", CTLTYPE_STRUCT }, \
129 { "adjkerntz", CTLTYPE_INT }, \
130 { "disable_rtc_set", CTLTYPE_INT }, \
131 { "bootinfo", CTLTYPE_STRUCT }, \
132 { "wall_cmos_clock", CTLTYPE_INT }, \
133}
134
135#ifdef _KERNEL
136extern char btext[];
137extern char etext[];
138extern u_char intr_nesting_level;
139
140void fork_trampoline __P((void));
141void fork_return __P((struct proc *, struct trapframe));
142#endif
143
144#endif /* !_MACHINE_CPU_H_ */