cpu.h revision 43524
11590Srgrimes/*- 21590Srgrimes * Copyright (c) 1990 The Regents of the University of California. 31590Srgrimes * All rights reserved. 41590Srgrimes * 51590Srgrimes * This code is derived from software contributed to Berkeley by 61590Srgrimes * William Jolitz. 71590Srgrimes * 81590Srgrimes * Redistribution and use in source and binary forms, with or without 91590Srgrimes * modification, are permitted provided that the following conditions 101590Srgrimes * are met: 111590Srgrimes * 1. Redistributions of source code must retain the above copyright 121590Srgrimes * notice, this list of conditions and the following disclaimer. 131590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141590Srgrimes * notice, this list of conditions and the following disclaimer in the 151590Srgrimes * documentation and/or other materials provided with the distribution. 161590Srgrimes * 3. All advertising materials mentioning features or use of this software 171590Srgrimes * must display the following acknowledgement: 181590Srgrimes * This product includes software developed by the University of 191590Srgrimes * California, Berkeley and its contributors. 201590Srgrimes * 4. Neither the name of the University nor the names of its contributors 211590Srgrimes * may be used to endorse or promote products derived from this software 221590Srgrimes * without specific prior written permission. 231590Srgrimes * 241590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2950477Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31132277Stjr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341590Srgrimes * SUCH DAMAGE. 351590Srgrimes * 361590Srgrimes * from: @(#)cpu.h 5.4 (Berkeley) 5/9/91 371590Srgrimes * $Id: cpu.h,v 1.37 1999/01/29 08:36:43 dillon Exp $ 3827623Scharnier */ 391590Srgrimes 401590Srgrimes#ifndef _MACHINE_CPU_H_ 411590Srgrimes#define _MACHINE_CPU_H_ 4272432Sru 431590Srgrimes/* 4479755Sdd * Definitions unique to i386 cpu support. 4527623Scharnier */ 461590Srgrimes#include <machine/psl.h> 471590Srgrimes#include <machine/frame.h> 481590Srgrimes#include <machine/segments.h> 491590Srgrimes 501590Srgrimes/* 511590Srgrimes * definitions of cpu-dependent requirements 5227623Scharnier * referenced in generic code 531590Srgrimes */ 541590Srgrimes#undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */ 551590Srgrimes 561590Srgrimes#define cpu_exec(p) /* nothing */ 571590Srgrimes#define cpu_swapin(p) /* nothing */ 581590Srgrimes#define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap)) 591590Srgrimes#define cpu_set_init_frame(p, fp) ((p)->p_md.md_regs = (fp)) 601590Srgrimes 611590Srgrimes#define CLKF_USERMODE(framep) \ 621590Srgrimes ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM)) 631590Srgrimes 64116112Scharnier#define CLKF_INTR(framep) (intr_nesting_level >= 2) 65116112Scharnier#if 0 661590Srgrimes/* 67131491Sru * XXX splsoftclock() is very broken and barely worth fixing. It doesn't 681590Srgrimes * turn off the clock bit in imen or in the icu. (This is not a serious 691590Srgrimes * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock() 701590Srgrimes * can take more than 62.5 usec so clock interrupts are lost.) It doesn't 711590Srgrimes * check for pending interrupts being unmasked. clkintr() and Xintr0() 72131491Sru * assume that the ipl is high when hardclock() returns. Our SWI_AST 731590Srgrimes * handling is efficient enough that little is gained by calling 741590Srgrimes * softclock() directly. 751590Srgrimes */ 761590Srgrimes#define CLKF_BASEPRI(framep) (((framep)->cf_ppl & ~SWI_AST_MASK) == 0) 771590Srgrimes#else 781590Srgrimes#define CLKF_BASEPRI(framep) (0) 79132396Stjr#endif 801590Srgrimes#define CLKF_PC(framep) ((framep)->cf_eip) 81132396Stjr 82132396Stjr/* 83132396Stjr * Preempt the current process if in interrupt from user mode, 84132396Stjr * or after the current trap/syscall if in system mode. 8527623Scharnier */ 86132396Stjr#define need_resched() { want_resched = 1; aston(); } 87132396Stjr 88132396Stjr#define resched_wanted() want_resched 891590Srgrimes 901590Srgrimes/* 911590Srgrimes * Arrange to handle pending profiling ticks before returning to user mode. 921590Srgrimes * 931590Srgrimes * XXX this is now poorly named and implemented. It used to handle only a 94140368Sru * single tick and the P_OWEUPC flag served as a counter. Now there is a 95132396Stjr * counter in the proc table and flag isn't really necessary. 96132396Stjr */ 97132396Stjr#define need_proftick(p) { (p)->p_flag |= P_OWEUPC; aston(); } 98132396Stjr 991590Srgrimes/* 1001590Srgrimes * Notify the current process (p) that it has a signal pending, 1011590Srgrimes * process as soon as possible. 1021590Srgrimes */ 1031590Srgrimes#define signotify(p) aston() 1041590Srgrimes 1051590Srgrimes#define aston() setsoftast() 106132397Stjr#define astoff() 107132397Stjr 108132397Stjr/* 1091590Srgrimes * CTL_MACHDEP definitions. 11095124Scharnier */ 11195124Scharnier#define CPU_CONSDEV 1 /* dev_t: console terminal device */ 11295124Scharnier#define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */ 11317787Smpp#define CPU_DISRTCSET 3 /* int: disable resettodr() call */ 114132277Stjr#define CPU_BOOTINFO 4 /* struct: bootinfo */ 115132396Stjr#define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */ 116132396Stjr#define CPU_MAXID 6 /* number of valid machdep ids */ 117132393Stjr 118132393Stjr#define CTL_MACHDEP_NAMES { \ 119132393Stjr { 0, 0 }, \ 120132393Stjr { "console_device", CTLTYPE_STRUCT }, \ 121 { "adjkerntz", CTLTYPE_INT }, \ 122 { "disable_rtc_set", CTLTYPE_INT }, \ 123 { "bootinfo", CTLTYPE_STRUCT }, \ 124 { "wall_cmos_clock", CTLTYPE_INT }, \ 125} 126 127#ifdef KERNEL 128extern char btext[]; 129extern char etext[]; 130extern u_char intr_nesting_level; 131extern int want_resched; /* resched was called */ 132 133void fork_trampoline __P((void)); 134void fork_return __P((struct proc *, struct trapframe)); 135void cpu_set_fork_handler __P((struct proc *, void (*pc)(const void *), const void *)); 136#endif 137 138#endif /* !_MACHINE_CPU_H_ */ 139