cpu.h revision 130585 
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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	from: @(#)cpu.h	5.4 (Berkeley) 5/9/91
33 * $FreeBSD: head/sys/i386/include/cpu.h 130585 2004-06-16 09:47:26Z phk $
34 */
35
36#ifndef _MACHINE_CPU_H_
37#define	_MACHINE_CPU_H_
38
39/*
40 * Definitions unique to i386 cpu support.
41 */
42#include <machine/psl.h>
43#include <machine/frame.h>
44#include <machine/segments.h>
45
46/*
47 * definitions of cpu-dependent requirements
48 * referenced in generic code
49 */
50#undef	COPY_SIGCODE		/* don't copy sigcode above user stack in exec */
51
52#define	cpu_exec(p)	/* nothing */
53#define cpu_swapin(p)	/* nothing */
54#define	cpu_getstack(td)		((td)->td_frame->tf_esp)
55#define cpu_setstack(td, ap)		((td)->td_frame->tf_esp = (ap))
56
57#define	TRAPF_USERMODE(framep) \
58	((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
59#define	TRAPF_PC(framep)	((framep)->tf_eip)
60
61#define	CLKF_USERMODE(framep) \
62	((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
63#define	CLKF_PC(framep)		((framep)->cf_eip)
64
65/*
66 * CTL_MACHDEP definitions.
67 */
68#define CPU_CONSDEV		1	/* struct cdev *: console terminal device */
69#define	CPU_ADJKERNTZ		2	/* int:	timezone offset	(seconds) */
70#define	CPU_DISRTCSET		3	/* int: disable resettodr() call */
71#define CPU_BOOTINFO		4	/* struct: bootinfo */
72#define	CPU_WALLCLOCK		5	/* int:	indicates wall CMOS clock */
73#define	CPU_MAXID		6	/* number of valid machdep ids */
74
75#define CTL_MACHDEP_NAMES { \
76	{ 0, 0 }, \
77	{ "console_device", CTLTYPE_STRUCT }, \
78	{ "adjkerntz", CTLTYPE_INT }, \
79	{ "disable_rtc_set", CTLTYPE_INT }, \
80	{ "bootinfo", CTLTYPE_STRUCT }, \
81	{ "wall_cmos_clock", CTLTYPE_INT }, \
82}
83
84#ifdef _KERNEL
85extern char	btext[];
86extern char	etext[];
87extern u_int	tsc_present;
88
89void	cpu_halt(void);
90void	cpu_reset(void);
91void	fork_trampoline(void);
92void	swi_vm(void *);
93
94/*
95 * Return contents of in-cpu fast counter as a sort of "bogo-time"
96 * for random-harvesting purposes.
97 */
98static __inline u_int64_t
99get_cyclecount(void)
100{
101#if defined(I386_CPU) || defined(I486_CPU) || defined(KLD_MODULE)
102	struct bintime bt;
103
104	if (!tsc_present) {
105		binuptime(&bt);
106		return (bt.frac ^ bt.sec);
107	}
108#endif
109	return (rdtsc());
110}
111
112#endif
113
114#endif /* !_MACHINE_CPU_H_ */
115