cpu.h revision 331722 
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: stable/11/sys/i386/include/cpu.h 331722 2018-03-29 02:50:57Z eadler $
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#define	cpu_exec(p)	/* nothing */
47#define	cpu_swapin(p)	/* nothing */
48#define	cpu_getstack(td)		((td)->td_frame->tf_esp)
49#define	cpu_setstack(td, ap)		((td)->td_frame->tf_esp = (ap))
50#define	cpu_spinwait()			ia32_pause()
51
52#define	TRAPF_USERMODE(framep) \
53	((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
54#define	TRAPF_PC(framep)	((framep)->tf_eip)
55
56#ifdef _KERNEL
57/*
58 * Struct containing pointers to CPU management functions whose
59 * implementation is run time selectable.  Selection can be made,
60 * for example, based on detection of a particular CPU variant or
61 * hypervisor environment.
62 */
63struct cpu_ops {
64	void (*cpu_init)(void);
65	void (*cpu_resume)(void);
66};
67
68extern struct	cpu_ops cpu_ops;
69extern char	btext[];
70extern char	etext[];
71
72void	cpu_halt(void);
73void	cpu_reset(void);
74void	fork_trampoline(void);
75void	swi_vm(void *);
76
77/*
78 * Return contents of in-cpu fast counter as a sort of "bogo-time"
79 * for random-harvesting purposes.
80 */
81static __inline uint64_t
82get_cyclecount(void)
83{
84
85	return (cpu_ticks());
86}
87
88#endif
89
90#endif /* !_MACHINE_CPU_H_ */
91