FreeBSD/Linux Kernel Cross Reference
sys/i386/include/cpu.h
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: releng/5.2/sys/i386/include/cpu.h 118990 2003-08-16 16:57:57Z marcel $
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
50 /*
51 * definitions of cpu-dependent requirements
52 * referenced in generic code
53 */
54 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
55
56 #define cpu_exec(p) /* nothing */
57 #define cpu_swapin(p) /* nothing */
58 #define cpu_getstack(td) ((td)->td_frame->tf_esp)
59 #define cpu_setstack(td, ap) ((td)->td_frame->tf_esp = (ap))
60
61 #define TRAPF_USERMODE(framep) \
62 ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
63 #define TRAPF_PC(framep) ((framep)->tf_eip)
64
65 #define CLKF_USERMODE(framep) \
66 ((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
67 #define CLKF_PC(framep) ((framep)->cf_eip)
68
69 /*
70 * CTL_MACHDEP definitions.
71 */
72 #define CPU_CONSDEV 1 /* dev_t: console terminal device */
73 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
74 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */
75 #define CPU_BOOTINFO 4 /* struct: bootinfo */
76 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
77 #define CPU_MAXID 6 /* number of valid machdep ids */
78
79 #define CTL_MACHDEP_NAMES { \
80 { 0, 0 }, \
81 { "console_device", CTLTYPE_STRUCT }, \
82 { "adjkerntz", CTLTYPE_INT }, \
83 { "disable_rtc_set", CTLTYPE_INT }, \
84 { "bootinfo", CTLTYPE_STRUCT }, \
85 { "wall_cmos_clock", CTLTYPE_INT }, \
86 }
87
88 #ifdef _KERNEL
89 extern char btext[];
90 extern char etext[];
91 extern u_int tsc_present;
92
93 void cpu_halt(void);
94 void cpu_reset(void);
95 void fork_trampoline(void);
96 void swi_vm(void *);
97
98 /*
99 * Return contents of in-cpu fast counter as a sort of "bogo-time"
100 * for random-harvesting purposes.
101 */
102 static __inline u_int64_t
103 get_cyclecount(void)
104 {
105 #if defined(I386_CPU) || defined(I486_CPU)
106 struct bintime bt;
107
108 if (!tsc_present) {
109 binuptime(&bt);
110 return (bt.frac ^ bt.sec);
111 }
112 #endif
113 return (rdtsc());
114 }
115
116 #endif
117
118 #endif /* !_MACHINE_CPU_H_ */
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