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 #define cpu_exec(p) /* nothing */ 47 #define cpu_swapin(p) /* nothing */ 48 #define cpu_getstack(td) ((td)->td_frame->tf_esp) 49 #define cpu_setstack(td, ap) ((td)->td_frame->tf_esp = (ap)) 50 #define cpu_spinwait() ia32_pause() 51 52 #define TRAPF_USERMODE(framep) \ 53 ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM)) 54 #define TRAPF_PC(framep) ((framep)->tf_eip) 55 56 #ifdef _KERNEL 57 /* 58 * Struct containing pointers to CPU management functions whose 59 * implementation is run time selectable. Selection can be made, 60 * for example, based on detection of a particular CPU variant or 61 * hypervisor environment. 62 */ 63 struct cpu_ops { 64 void (*cpu_init)(void); 65 void (*cpu_resume)(void); 66 }; 67 68 extern struct cpu_ops cpu_ops; 69 extern char btext[]; 70 extern char etext[]; 71 72 void cpu_halt(void); 73 void cpu_reset(void); 74 void fork_trampoline(void); 75 void swi_vm(void *); 76 77 /* 78 * Return contents of in-cpu fast counter as a sort of "bogo-time" 79 * for random-harvesting purposes. 80 */ 81 static __inline uint64_t 82 get_cyclecount(void) 83 { 84 85 return (cpu_ticks()); 86 } 87 88 #endif 89 90 #endif /* !_MACHINE_CPU_H_ */ 91