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 extern char btext[]; 58 extern char etext[]; 59 extern u_int tsc_present; 60 61 void cpu_halt(void); 62 void cpu_reset(void); 63 void fork_trampoline(void); 64 void swi_vm(void *); 65 66 /* 67 * Return contents of in-cpu fast counter as a sort of "bogo-time" 68 * for random-harvesting purposes. 69 */ 70 static __inline u_int64_t 71 get_cyclecount(void) 72 { 73 #if defined(I486_CPU) || defined(KLD_MODULE) 74 struct bintime bt; 75 76 if (!tsc_present) { 77 binuptime(&bt); 78 return (bt.frac ^ bt.sec); 79 } 80 #endif 81 return (rdtsc()); 82 } 83 84 #endif 85 86 #endif /* !_MACHINE_CPU_H_ */ 87