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 * from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
35 */
36
37 #ifndef _MACHINE_CPU_H_
38 #define _MACHINE_CPU_H_
39
40 /*
41 * Definitions unique to i386 cpu support.
42 */
43 #include <machine/psl.h>
44 #include <machine/frame.h>
45 #include <machine/segments.h>
46
47 #define cpu_exec(p) /* nothing */
48 #define cpu_swapin(p) /* nothing */
49 #define cpu_getstack(td) ((td)->td_frame->tf_rsp)
50 #define cpu_setstack(td, ap) ((td)->td_frame->tf_rsp = (ap))
51 #define cpu_spinwait() ia32_pause()
52
53 #define TRAPF_USERMODE(framep) \
54 (ISPL((framep)->tf_cs) == SEL_UPL)
55 #define TRAPF_PC(framep) ((framep)->tf_rip)
56
57 #ifdef _KERNEL
58 /*
59 * Struct containing pointers to CPU management functions whose
60 * implementation is run time selectable. Selection can be made,
61 * for example, based on detection of a particular CPU variant or
62 * hypervisor environment.
63 */
64 struct cpu_ops {
65 void (*cpu_init)(void);
66 void (*cpu_resume)(void);
67 };
68
69 extern struct cpu_ops cpu_ops;
70 extern char brwsection[];
71 extern char btext[];
72 extern char _end[];
73 extern char etext[];
74
75 /* Resume hook for VMM. */
76 extern void (*vmm_resume_p)(void);
77
78 void cpu_halt(void);
79 void cpu_lock_delay(void);
80 void cpu_reset(void);
81 void fork_trampoline(void);
82
83 /*
84 * Return contents of in-cpu fast counter as a sort of "bogo-time"
85 * for random-harvesting purposes.
86 */
87 static __inline u_int64_t
get_cyclecount(void)88 get_cyclecount(void)
89 {
90
91 return (rdtsc());
92 }
93
94 #define MEMSET_EARLY_FUNC memset_std
95 #define MEMCPY_EARLY_FUNC memcpy_std
96 #define MEMMOVE_EARLY_FUNC memmove_std
97
98 #endif
99
100 #endif /* !_MACHINE_CPU_H_ */
101