cpu.h revision 83366 
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 83366 2001-09-12 08:38:13Z julian $
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#include <machine/globals.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_getstack(td)		((td)->td_frame->tf_esp)
60#define cpu_setstack(td, ap)		((td)->td_frame->tf_esp = (ap))
61
62#define	TRAPF_USERMODE(framep) \
63	((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
64#define	TRAPF_PC(framep)	((framep)->tf_eip)
65
66#define	CLKF_USERMODE(framep) \
67	((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
68#define	CLKF_PC(framep)		((framep)->cf_eip)
69
70/*
71 * CTL_MACHDEP definitions.
72 */
73#define CPU_CONSDEV		1	/* dev_t: console terminal device */
74#define	CPU_ADJKERNTZ		2	/* int:	timezone offset	(seconds) */
75#define	CPU_DISRTCSET		3	/* int: disable resettodr() call */
76#define CPU_BOOTINFO		4	/* struct: bootinfo */
77#define	CPU_WALLCLOCK		5	/* int:	indicates wall CMOS clock */
78#define	CPU_MAXID		6	/* number of valid machdep ids */
79
80#define CTL_MACHDEP_NAMES { \
81	{ 0, 0 }, \
82	{ "console_device", CTLTYPE_STRUCT }, \
83	{ "adjkerntz", CTLTYPE_INT }, \
84	{ "disable_rtc_set", CTLTYPE_INT }, \
85	{ "bootinfo", CTLTYPE_STRUCT }, \
86	{ "wall_cmos_clock", CTLTYPE_INT }, \
87}
88
89#ifdef _KERNEL
90extern char	btext[];
91extern char	etext[];
92extern u_int	tsc_present;
93
94void	fork_trampoline __P((void));
95
96/*
97 * Return contents of in-cpu fast counter as a sort of "bogo-time"
98 * for non-critical timing.
99 */
100static __inline u_int64_t
101get_cyclecount(void)
102{
103#if defined(I386_CPU) || defined(I486_CPU)
104	struct timespec tv;
105
106	if (!tsc_present) {
107		nanotime(&tv);
108		return (tv.tv_sec * (u_int64_t)1000000000 + tv.tv_nsec);
109	}
110#endif
111	return (rdtsc());
112}
113
114#endif
115
116#endif /* !_MACHINE_CPU_H_ */
117