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 * $FreeBSD$ 36 */ 37 38 #ifndef _MACHINE_CPU_H_ 39 #define _MACHINE_CPU_H_ 40 41 /* 42 * Definitions unique to i386 cpu support. 43 */ 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_reset(void); 76 void fork_trampoline(void); 77 void swi_vm(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 84 get_cyclecount(void) 85 { 86 87 return (cpu_ticks()); 88 } 89 90 #endif 91 92 #endif /* !_MACHINE_CPU_H_ */ 93