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