xref: /freebsd/sys/amd64/include/cpu.h (revision 6990ffd8a95caaba6858ad44ff1b3157d1efba8f)
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  * $FreeBSD$
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
90 extern char	btext[];
91 extern char	etext[];
92 extern u_int	tsc_present;
93 
94 void	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  */
100 static __inline u_int64_t
101 get_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