cpu.h revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	from: @(#)cpu.h	5.4 (Berkeley) 5/9/91
35 * $FreeBSD: stable/11/sys/amd64/include/cpu.h 330897 2018-03-14 03:19:51Z eadler $
36 */
37
38#ifndef _MACHINE_CPU_H_
39#define	_MACHINE_CPU_H_
40
41/*
42 * Definitions unique to i386 cpu support.
43 */
44#include <machine/psl.h>
45#include <machine/frame.h>
46#include <machine/segments.h>
47
48#define	cpu_exec(p)	/* nothing */
49#define	cpu_swapin(p)	/* nothing */
50#define	cpu_getstack(td)		((td)->td_frame->tf_rsp)
51#define	cpu_setstack(td, ap)		((td)->td_frame->tf_rsp = (ap))
52#define	cpu_spinwait()			ia32_pause()
53
54#define	TRAPF_USERMODE(framep) \
55	(ISPL((framep)->tf_cs) == SEL_UPL)
56#define	TRAPF_PC(framep)	((framep)->tf_rip)
57
58#ifdef _KERNEL
59/*
60 * Struct containing pointers to CPU management functions whose
61 * implementation is run time selectable.  Selection can be made,
62 * for example, based on detection of a particular CPU variant or
63 * hypervisor environment.
64 */
65struct cpu_ops {
66	void (*cpu_init)(void);
67	void (*cpu_resume)(void);
68};
69
70extern struct	cpu_ops cpu_ops;
71extern char	btext[];
72extern char	etext[];
73
74/* Resume hook for VMM. */
75extern	void (*vmm_resume_p)(void);
76
77void	cpu_halt(void);
78void	cpu_reset(void);
79void	fork_trampoline(void);
80void	swi_vm(void *);
81
82/*
83 * Return contents of in-cpu fast counter as a sort of "bogo-time"
84 * for random-harvesting purposes.
85 */
86static __inline u_int64_t
87get_cyclecount(void)
88{
89
90	return (rdtsc());
91}
92
93#endif
94
95#endif /* !_MACHINE_CPU_H_ */
96