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cpu.h revision 1.12 
      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 1.12 1993/12/17 00:10:49 mycroft Exp $
     38  */
     39 
     40 /*
     41  * Definitions unique to i386 cpu support.
     42  */
     43 #include <machine/psl.h>
     44 #include <machine/frame.h>
     45 #include <machine/segments.h>
     46 
     47 /*
     48  * definitions of cpu-dependent requirements
     49  * referenced in generic code
     50  */
     51 #define	COPY_SIGCODE	/* copy sigcode above user stack in exec */
     52 
     53 #define	cpu_exec(p)	/* nothing */
     54 
     55 /*
     56  * Arguments to hardclock, softclock and gatherstats
     57  * encapsulate the previous machine state in an opaque
     58  * clockframe; for now, use generic intrframe.
     59  *
     60  * XXX intrframe has a lot of gunk we don't need.
     61  */
     62 typedef struct intrframe clockframe;
     63 
     64 #define	CLKF_USERMODE(framep)	(ISPL((framep)->if_cs) == SEL_UPL)
     65 #define	CLKF_BASEPRI(framep)	((framep)->if_ppl == 0)
     66 #define	CLKF_PC(framep)		((framep)->if_eip)
     67 #define	CLKF_INTR(framep)	(0)	/* XXX should have an interrupt stack */
     68 
     69 /*
     70  * Software interrupt request `register'.
     71  */
     72 int	sir;
     73 
     74 #define	SIR_AST		0
     75 #define	SIR_NET		1
     76 #define	SIR_CLOCK	2
     77 
     78 #define	softintr(n)	(sir |= 1 << (n))
     79 #define	setsoftnet()	softintr(SIR_NET)
     80 #define	setsoftclock()	softintr(SIR_CLOCK)
     81 
     82 /*
     83  * Preempt the current process if in interrupt from user mode,
     84  * or after the current trap/syscall if in system mode.
     85  */
     86 int	want_resched;	/* resched() was called */
     87 #define	need_resched()	(want_resched = 1, softintr(SIR_AST))
     88 
     89 /*
     90  * Give a profiling tick to the current process when the user profiling
     91  * buffer pages are invalid.  On the i386, request an ast to send us
     92  * through trap(), marking the proc as needing a profiling tick.
     93  */
     94 #define	profile_tick(p, framep)	((p)->p_flag |= SOWEUPC, softintr(SIR_AST))
     95 #define	need_proftick(p)	((p)->p_flag |= SOWEUPC, softintr(SIR_AST))
     96 
     97 /*
     98  * Notify the current process (p) that it has a signal pending,
     99  * process as soon as possible.
    100  */
    101 #define	signotify(p)	softintr(SIR_AST)
    102 
    103 /*
    104  * pull in #defines for kinds of processors
    105  */
    106 #include "machine/cputypes.h"
    107 
    108 struct cpu_nameclass {
    109 	char *cpu_name;
    110 	int  cpu_class;
    111 };
    112 
    113 #ifdef KERNEL
    114 extern int cpu;
    115 extern int cpu_class;
    116 extern struct cpu_nameclass i386_cpus[];
    117 #endif
    118