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cpu.h revision 1.6 
      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  *	$Id: cpu.h,v 1.6 1993/05/21 12:26:03 cgd Exp $
     38  */
     39 
     40 /*
     41  * Definitions unique to i386 cpu support.
     42  */
     43 #include "machine/frame.h"
     44 #include "machine/segments.h"
     45 
     46 /*
     47  * definitions of cpu-dependent requirements
     48  * referenced in generic code
     49  */
     50 #undef	COPY_SIGCODE		/* don't copy sigcode above user stack in exec */
     51 
     52 /*
     53  * function vs. inline configuration;
     54  * these are defined to get generic functions
     55  * rather than inline or machine-dependent implementations
     56  */
     57 #define	NEED_MINMAX		/* need {,i,l,ul}{min,max} functions */
     58 #define	NEED_FFS		/* need ffs function */
     59 #define	NEED_BCMP		/* need bcmp function */
     60 #define	NEED_STRLEN		/* need strlen function */
     61 
     62 #define	cpu_exec(p)	/* nothing */
     63 
     64 /*
     65  * Arguments to hardclock, softclock and gatherstats
     66  * encapsulate the previous machine state in an opaque
     67  * clockframe; for now, use generic intrframe.
     68  */
     69 typedef struct intrframe clockframe;
     70 
     71 #define	CLKF_USERMODE(framep)	(ISPL((framep)->if_cs) == SEL_UPL)
     72 #define	CLKF_BASEPRI(framep)	((framep)->if_ppl == 0)
     73 #define	CLKF_PC(framep)		((framep)->if_eip)
     74 
     75 #define	resettodr()	/* no todr to set */
     76 
     77 /*
     78  * Preempt the current process if in interrupt from user mode,
     79  * or after the current trap/syscall if in system mode.
     80  */
     81 #define	need_resched()	{ want_resched++; aston(); }
     82 
     83 /*
     84  * Give a profiling tick to the current process from the softclock
     85  * interrupt.  On tahoe, request an ast to send us through trap(),
     86  * marking the proc as needing a profiling tick.
     87  */
     88 #define	profile_tick(p, framep)	{ (p)->p_flag |= SOWEUPC; aston(); }
     89 
     90 /*
     91  * Notify the current process (p) that it has a signal pending,
     92  * process as soon as possible.
     93  */
     94 #define	signotify(p)	aston()
     95 
     96 #define aston() (astpending++)
     97 
     98 int	astpending;		/* need to trap before returning to user mode */
     99 int	want_resched;		/* resched() was called */
    100 
    101 /*
    102  * pull in #defines for kinds of processors
    103  */
    104 #include "machine/cputypes.h"
    105 
    106 struct cpu_nameclass {
    107 	char *cpu_name;
    108 	int  cpu_class;
    109 };
    110 
    111 #ifdef KERNEL
    112 extern int cpu;
    113 extern struct cpu_nameclass i386_cpus[];
    114 #endif
    115