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cpu.h revision 1.1 
      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  *	@(#)cpu.h	5.4 (Berkeley) 5/9/91
     37  */
     38 
     39 /*
     40  * Definitions unique to i386 cpu support.
     41  */
     42 #include "machine/frame.h"
     43 #include "machine/segments.h"
     44 
     45 /*
     46  * definitions of cpu-dependent requirements
     47  * referenced in generic code
     48  */
     49 #undef	COPY_SIGCODE		/* don't copy sigcode above user stack in exec */
     50 
     51 /*
     52  * function vs. inline configuration;
     53  * these are defined to get generic functions
     54  * rather than inline or machine-dependent implementations
     55  */
     56 #define	NEED_MINMAX		/* need {,i,l,ul}{min,max} functions */
     57 #define	NEED_FFS		/* need ffs function */
     58 #define	NEED_BCMP		/* need bcmp function */
     59 #define	NEED_STRLEN		/* need strlen function */
     60 
     61 #define	cpu_exec(p)	/* nothing */
     62 
     63 /*
     64  * Arguments to hardclock, softclock and gatherstats
     65  * encapsulate the previous machine state in an opaque
     66  * clockframe; for now, use generic intrframe.
     67  */
     68 typedef struct intrframe clockframe;
     69 
     70 #define	CLKF_USERMODE(framep)	(ISPL((framep)->if_cs) == SEL_UPL)
     71 #define	CLKF_BASEPRI(framep)	((framep)->if_ppl == 0)
     72 #define	CLKF_PC(framep)		((framep)->if_eip)
     73 
     74 #define	resettodr()	/* no todr to set */
     75 
     76 /*
     77  * Preempt the current process if in interrupt from user mode,
     78  * or after the current trap/syscall if in system mode.
     79  */
     80 #define	need_resched()	{ want_resched++; aston(); }
     81 
     82 /*
     83  * Give a profiling tick to the current process from the softclock
     84  * interrupt.  On tahoe, request an ast to send us through trap(),
     85  * marking the proc as needing a profiling tick.
     86  */
     87 #define	profile_tick(p, framep)	{ (p)->p_flag |= SOWEUPC; aston(); }
     88 
     89 /*
     90  * Notify the current process (p) that it has a signal pending,
     91  * process as soon as possible.
     92  */
     93 #define	signotify(p)	aston()
     94 
     95 #define aston() (astpending++)
     96 
     97 int	astpending;		/* need to trap before returning to user mode */
     98 int	want_resched;		/* resched() was called */
     99 
    100 /*
    101  * Kinds of processor
    102  */
    103 
    104 #define	CPU_386SX	0
    105 #define	CPU_386		1
    106 #define	CPU_486SX	2
    107 #define	CPU_486		3
    108 #define	CPU_586		4
    109