cpu.h revision 72200 
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 72200 2001-02-09 06:11:45Z bmilekic $
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(p)			((p)->p_md.md_regs->tf_esp)
60#define cpu_setstack(p, ap)		((p)->p_md.md_regs->tf_esp = (ap))
61
62#define	CLKF_USERMODE(framep) \
63	((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
64
65#define CLKF_INTR(framep)	(curproc->p_intr_nesting_level >= 2)
66#define	CLKF_PC(framep)		((framep)->cf_eip)
67
68/*
69 * astpending bits
70 */
71#define	AST_PENDING	0x00000001
72#define	AST_RESCHED	0x00000002
73
74/*
75 * Preempt the current process if in interrupt from user mode,
76 * or after the current trap/syscall if in system mode.
77 *
78 * XXX: if astpending is later changed to an |= here due to more flags being
79 * added, we will have an atomicy problem.  The type of atomicy we need is
80 * a non-locked orl.
81 */
82#define	need_resched() do {						\
83	PCPU_SET(astpending, AST_RESCHED|AST_PENDING);			\
84} while (0)
85#define	resched_wanted()	(PCPU_GET(astpending) & AST_RESCHED)
86
87/*
88 * Arrange to handle pending profiling ticks before returning to user mode.
89 *
90 * XXX this is now poorly named and implemented.  It used to handle only a
91 * single tick and the PS_OWEUPC flag served as a counter.  Now there is a
92 * counter in the proc table and flag isn't really necessary.
93 */
94#define	need_proftick(p) do {						\
95	mtx_lock_spin(&sched_lock);				\
96	(p)->p_sflag |= PS_OWEUPC;					\
97	mtx_unlock_spin(&sched_lock);				\
98	aston();							\
99} while (0)
100
101/*
102 * Notify the current process (p) that it has a signal pending,
103 * process as soon as possible.
104 *
105 * XXX: aston() really needs to be an atomic (not locked, but an orl),
106 * in case need_resched() is set by an interrupt.  But with astpending a
107 * per-cpu variable this is not trivial to do efficiently.  For now we blow
108 * it off (asynchronous need_resched() conflicts are not critical).
109 */
110#define	signotify(p)	aston()
111#define	aston() do {							\
112	PCPU_SET(astpending, PCPU_GET(astpending) | AST_PENDING);	\
113} while (0)
114#define astoff()
115
116/*
117 * CTL_MACHDEP definitions.
118 */
119#define CPU_CONSDEV		1	/* dev_t: console terminal device */
120#define	CPU_ADJKERNTZ		2	/* int:	timezone offset	(seconds) */
121#define	CPU_DISRTCSET		3	/* int: disable resettodr() call */
122#define CPU_BOOTINFO		4	/* struct: bootinfo */
123#define	CPU_WALLCLOCK		5	/* int:	indicates wall CMOS clock */
124#define	CPU_MAXID		6	/* number of valid machdep ids */
125
126#define CTL_MACHDEP_NAMES { \
127	{ 0, 0 }, \
128	{ "console_device", CTLTYPE_STRUCT }, \
129	{ "adjkerntz", CTLTYPE_INT }, \
130	{ "disable_rtc_set", CTLTYPE_INT }, \
131	{ "bootinfo", CTLTYPE_STRUCT }, \
132	{ "wall_cmos_clock", CTLTYPE_INT }, \
133}
134
135#ifdef _KERNEL
136extern char	btext[];
137extern char	etext[];
138
139void	fork_trampoline __P((void));
140
141#if defined(I386_CPU) || defined(I486_CPU)
142extern u_int   tsc_present;
143#endif
144
145/*
146 * Return contents of in-cpu fast counter as a sort of "bogo-time"
147 * for non-critical timing.
148 */
149static __inline u_int64_t
150get_cyclecount(void)
151{
152#if defined(I386_CPU) || defined(I486_CPU)
153	struct timespec tv;
154
155	if (!tsc_present) {
156		nanotime(&tv);
157		return (tv.tv_sec * (u_int64_t)1000000000 + tv.tv_nsec);
158	}
159#endif
160	return (rdtsc());
161}
162
163#endif
164
165#endif /* !_MACHINE_CPU_H_ */
166