cpu.h revision 64529 
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: head/sys/amd64/include/cpu.h 64529 2000-08-11 09:05:12Z peter $
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_ */
145