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 * 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 * $FreeBSD$
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 /*
47 * definitions of cpu-dependent requirements
48 * referenced in generic code
49 */
50 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
51
52 #define cpu_exec(p) /* nothing */
53 #define cpu_swapin(p) /* nothing */
54 #define cpu_getstack(td) ((td)->td_frame->tf_esp)
55 #define cpu_setstack(td, ap) ((td)->td_frame->tf_esp = (ap))
56 #define cpu_spinwait() ia32_pause()
57
58 #define TRAPF_USERMODE(framep) \
59 ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
60 #define TRAPF_PC(framep) ((framep)->tf_eip)
61
62 #define CLKF_USERMODE(framep) \
63 ((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
64 #define CLKF_PC(framep) ((framep)->cf_eip)
65
66 /*
67 * CTL_MACHDEP definitions.
68 */
69 #define CPU_CONSDEV 1 /* dev_t: console terminal device */
70 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
71 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */
72 #define CPU_BOOTINFO 4 /* struct: bootinfo */
73 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
74 #define CPU_MAXID 6 /* number of valid machdep ids */
75
76 #define CTL_MACHDEP_NAMES { \
77 { 0, 0 }, \
78 { "console_device", CTLTYPE_STRUCT }, \
79 { "adjkerntz", CTLTYPE_INT }, \
80 { "disable_rtc_set", CTLTYPE_INT }, \
81 { "bootinfo", CTLTYPE_STRUCT }, \
82 { "wall_cmos_clock", CTLTYPE_INT }, \
83 }
84
85 #ifdef _KERNEL
86 extern char btext[];
87 extern char etext[];
88 extern u_int tsc_present;
89
90 void cpu_halt(void);
91 void cpu_reset(void);
92 void fork_trampoline(void);
93 void swi_vm(void *);
94
95 /*
96 * Return contents of in-cpu fast counter as a sort of "bogo-time"
97 * for random-harvesting purposes.
98 */
99 static __inline u_int64_t
100 get_cyclecount(void)
101 {
102 #if defined(I386_CPU) || defined(I486_CPU) || defined(KLD_MODULE)
103 struct bintime bt;
104
105 if (!tsc_present) {
106 binuptime(&bt);
107 return (bt.frac ^ bt.sec);
108 }
109 #endif
110 return (rdtsc());
111 }
112
113 #endif
114
115 #endif /* !_MACHINE_CPU_H_ */
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