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 * 3. 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
35 #ifndef _MACHINE_CPU_H_
36 #define _MACHINE_CPU_H_
37
38 /*
39 * Definitions unique to i386 cpu support.
40 */
41 #ifdef _KERNEL
42 #include <sys/systm.h> /* For cpu_ticks(). */
43 #endif
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_esp)
51 #define cpu_setstack(td, ap) ((td)->td_frame->tf_esp = (ap))
52 #define cpu_spinwait() ia32_pause()
53
54 #define TRAPF_USERMODE(framep) \
55 ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
56 #define TRAPF_PC(framep) ((framep)->tf_eip)
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 */
65 struct cpu_ops {
66 void (*cpu_init)(void);
67 void (*cpu_resume)(void);
68 };
69
70 extern struct cpu_ops cpu_ops;
71 extern char btext[];
72 extern char etext[];
73
74 void cpu_halt(void);
75 void cpu_lock_delay(void);
76 void cpu_reset(void);
77 void fork_trampoline(void);
78
79 /*
80 * Return contents of in-cpu fast counter as a sort of "bogo-time"
81 * for random-harvesting purposes.
82 */
83 static __inline uint64_t
get_cyclecount(void)84 get_cyclecount(void)
85 {
86
87 return (cpu_ticks());
88 }
89
90 #endif
91
92 #endif /* !_MACHINE_CPU_H_ */
93