cpu.h revision 153666 
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 153666 2005-12-22 22:16:09Z jhb $
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#define	cpu_spinwait()			ia32_pause()
57
58#define	TRAPF_USERMODE(framep) \
59	((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
60#define	TRAPF_PC(framep)	((framep)->tf_eip)
61
62/*
63 * CTL_MACHDEP definitions.
64 */
65#define CPU_CONSDEV		1	/* dev_t: console terminal device */
66#define	CPU_ADJKERNTZ		2	/* int:	timezone offset	(seconds) */
67#define	CPU_DISRTCSET		3	/* int: disable resettodr() call */
68#define CPU_BOOTINFO		4	/* struct: bootinfo */
69#define	CPU_WALLCLOCK		5	/* int:	indicates wall CMOS clock */
70#define	CPU_MAXID		6	/* number of valid machdep ids */
71
72#define CTL_MACHDEP_NAMES { \
73	{ 0, 0 }, \
74	{ "console_device", CTLTYPE_STRUCT }, \
75	{ "adjkerntz", CTLTYPE_INT }, \
76	{ "disable_rtc_set", CTLTYPE_INT }, \
77	{ "bootinfo", CTLTYPE_STRUCT }, \
78	{ "wall_cmos_clock", CTLTYPE_INT }, \
79}
80
81#ifdef _KERNEL
82extern char	btext[];
83extern char	etext[];
84extern u_int	tsc_present;
85
86void	cpu_halt(void);
87void	cpu_reset(void);
88void	fork_trampoline(void);
89void	swi_vm(void *);
90
91/*
92 * Return contents of in-cpu fast counter as a sort of "bogo-time"
93 * for random-harvesting purposes.
94 */
95static __inline u_int64_t
96get_cyclecount(void)
97{
98#if defined(I486_CPU) || defined(KLD_MODULE)
99	struct bintime bt;
100
101	if (!tsc_present) {
102		binuptime(&bt);
103		return (bt.frac ^ bt.sec);
104	}
105#endif
106	return (rdtsc());
107}
108
109#endif
110
111#endif /* !_MACHINE_CPU_H_ */
112