cpu.h revision 67011
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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)cpu.h 5.4 (Berkeley) 5/9/91 37 * $FreeBSD: head/sys/amd64/include/cpu.h 67011 2000-10-12 11:13:27Z bde $ 38 */ 39 40#ifndef _MACHINE_CPU_H_ 41#define _MACHINE_CPU_H_ 42 43/* 44 * Definitions unique to i386 cpu support. 45 */ 46#include <machine/psl.h> 47#include <machine/frame.h> 48#include <machine/segments.h> 49#include <machine/globals.h> 50 51/* 52 * definitions of cpu-dependent requirements 53 * referenced in generic code 54 */ 55#undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */ 56 57#define cpu_exec(p) /* nothing */ 58#define cpu_swapin(p) /* nothing */ 59#define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap)) 60 61#define CLKF_USERMODE(framep) \ 62 ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM)) 63 64#define CLKF_INTR(framep) (intr_nesting_level >= 2) 65#define CLKF_PC(framep) ((framep)->cf_eip) 66 67/* 68 * astpending bits 69 */ 70#define AST_PENDING 0x00000001 71#define AST_RESCHED 0x00000002 72 73/* 74 * Preempt the current process if in interrupt from user mode, 75 * or after the current trap/syscall if in system mode. 76 * 77 * XXX: if astpending is later changed to an |= here due to more flags being 78 * added, we will have an atomicy problem. The type of atomicy we need is 79 * a non-locked orl. 80 */ 81#define need_resched() do { \ 82 PCPU_SET(astpending, AST_RESCHED|AST_PENDING); \ 83} while (0) 84#define resched_wanted() (astpending & AST_RESCHED) 85 86/* 87 * Arrange to handle pending profiling ticks before returning to user mode. 88 * 89 * XXX this is now poorly named and implemented. It used to handle only a 90 * single tick and the P_OWEUPC flag served as a counter. Now there is a 91 * counter in the proc table and flag isn't really necessary. 92 */ 93#define need_proftick(p) \ 94 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0) 95 96/* 97 * Notify the current process (p) that it has a signal pending, 98 * process as soon as possible. 99 * 100 * XXX: aston() really needs to be an atomic (not locked, but an orl), 101 * in case need_resched() is set by an interrupt. But with astpending a 102 * per-cpu variable this is not trivial to do efficiently. For now we blow 103 * it off (asynchronous need_resched() conflicts are not critical). 104 */ 105#define signotify(p) aston() 106#define aston() do { \ 107 PCPU_SET(astpending, astpending | AST_PENDING); \ 108} while (0) 109#define astoff() 110 111/* 112 * CTL_MACHDEP definitions. 113 */ 114#define CPU_CONSDEV 1 /* dev_t: console terminal device */ 115#define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */ 116#define CPU_DISRTCSET 3 /* int: disable resettodr() call */ 117#define CPU_BOOTINFO 4 /* struct: bootinfo */ 118#define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */ 119#define CPU_MAXID 6 /* number of valid machdep ids */ 120 121#define CTL_MACHDEP_NAMES { \ 122 { 0, 0 }, \ 123 { "console_device", CTLTYPE_STRUCT }, \ 124 { "adjkerntz", CTLTYPE_INT }, \ 125 { "disable_rtc_set", CTLTYPE_INT }, \ 126 { "bootinfo", CTLTYPE_STRUCT }, \ 127 { "wall_cmos_clock", CTLTYPE_INT }, \ 128} 129 130#ifdef _KERNEL 131extern char btext[]; 132extern char etext[]; 133#ifndef intr_nesting_level 134extern u_char intr_nesting_level; 135#endif 136 137void fork_trampoline __P((void)); 138void fork_return __P((struct proc *, struct trapframe)); 139#endif 140 141#endif /* !_MACHINE_CPU_H_ */ 142