usr/src/sys/i386/include/cpu.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)cpu.h       5.4 (Berkeley) 5/9/91
 */

/*
 * Definitions unique to i386 cpu support.
 */
#include "machine/frame.h"
#include "machine/segments.h"

/*
 * definitions of cpu-dependent requirements
 * referenced in generic code
 */
#undef  COPY_SIGCODE            /* don't copy sigcode above user stack in exec */

/*
 * function vs. inline configuration;
 * these are defined to get generic functions
 * rather than inline or machine-dependent implementations
 */
#define NEED_MINMAX             /* need {,i,l,ul}{min,max} functions */
#define NEED_FFS                /* need ffs function */
#define NEED_BCMP               /* need bcmp function */
#define NEED_STRLEN             /* need strlen function */

#define cpu_exec(p)     /* nothing */

/*
 * Arguments to hardclock, softclock and gatherstats
 * encapsulate the previous machine state in an opaque
 * clockframe; for now, use generic intrframe.
 */
typedef struct intrframe clockframe;

#define CLKF_USERMODE(framep)   (ISPL((framep)->if_cs) == SEL_UPL)
#define CLKF_BASEPRI(framep)    ((framep)->if_ppl == 0)
#define CLKF_PC(framep)         ((framep)->if_eip)

#define resettodr()     /* no todr to set */

/*
 * Preempt the current process if in interrupt from user mode,
 * or after the current trap/syscall if in system mode.
 */
#define need_resched()  { want_resched++; aston(); }

/*
 * Give a profiling tick to the current process from the softclock
 * interrupt.  On tahoe, request an ast to send us through trap(),
 * marking the proc as needing a profiling tick.
 */
#define profile_tick(p, framep) { (p)->p_flag |= SOWEUPC; aston(); }

/*
 * Notify the current process (p) that it has a signal pending,
 * process as soon as possible.
 */
#define signotify(p)    aston()

#define aston() (astpending++)

int     astpending;             /* need to trap before returning to user mode */
int     want_resched;           /* resched() was called */

/*
 * Kinds of processor
 */

#define CPU_386SX       0
#define CPU_386         1
#define CPU_486SX       2
#define CPU_486         3
#define CPU_586         4