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cpu.h revision 1.22 
      1 /*	$NetBSD: cpu.h,v 1.22 1997/03/20 16:21:10 gwr Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Gordon W. Ross
      5  * Copyright (c) 1993 Adam Glass
      6  * Copyright (c) 1988 University of Utah.
      7  * Copyright (c) 1982, 1990 The Regents of the University of California.
      8  * All rights reserved.
      9  *
     10  * This code is derived from software contributed to Berkeley by
     11  * the Systems Programming Group of the University of Utah Computer
     12  * Science Department.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *	This product includes software developed by the University of
     25  *	California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	from: Utah Hdr: cpu.h 1.16 91/03/25
     43  *	from: @(#)cpu.h	7.7 (Berkeley) 6/27/91
     44  *	cpu.h,v 1.2 1993/05/22 07:58:17 cgd Exp
     45  */
     46 
     47 #ifndef _CPU_H_
     48 #define _CPU_H_
     49 
     50 #ifdef _KERNEL
     51 
     52 /*
     53  * External definitions unique to sun3/68k cpu support.
     54  * These are the "public" declarations - those needed in
     55  * machine-independent source code.  The "priviate" ones
     56  * are in machdep.h (used only inside sys/arch/sun3).
     57  *
     58  * Note that the name of this file is NOT meant to imply
     59  * that it has anything to do with mc68020 CPU stuff.
     60  * The name "cpu" is historical, and used in the common
     61  * code to identify machine-dependent functions, etc.
     62  */
     63 
     64 /*
     65  * definitions of cpu-dependent requirements
     66  * referenced in generic code
     67  */
     68 #define	cpu_wait(p)			/* nothing */
     69 
     70 /*
     71  * Arguments to hardclock and gatherstats encapsulate the previous
     72  * machine state in an opaque clockframe.  One the sun3, we use
     73  * what the locore.s glue puts on the stack before calling C-code.
     74  */
     75 struct clockframe {
     76 	u_int	cf_regs[4];	/* d0,d1,a0,a1 */
     77 	u_short	cf_sr;		/* sr at time of interrupt */
     78 	u_long	cf_pc;		/* pc at time of interrupt */
     79 	u_short	cf_vo;		/* vector offset (4-word frame) */
     80 };
     81 
     82 #define	CLKF_USERMODE(framep)	(((framep)->cf_sr & PSL_S) == 0)
     83 #define	CLKF_BASEPRI(framep)	(((framep)->cf_sr & PSL_IPL) == 0)
     84 #define	CLKF_PC(framep)		((framep)->cf_pc)
     85 #if 0
     86 /* We would like to do it this way... */
     87 #define	CLKF_INTR(framep)	(((framep)->cf_sr & PSL_M) == 0)
     88 #else
     89 /* but until we start using PSL_M, we have to do this instead */
     90 #define	CLKF_INTR(framep)	(0)	/* XXX */
     91 #endif
     92 
     93 extern int astpending;	 /* need to trap before returning to user mode */
     94 #define aston() (astpending = 1)
     95 
     96 /*
     97  * Preempt the current process if in interrupt from user mode,
     98  * or after the current trap/syscall if in system mode.
     99  */
    100 extern int want_resched; /* resched() was called */
    101 #define	need_resched()	{ want_resched = 1; aston(); }
    102 
    103 /*
    104  * Give a profiling tick to the current process when the user profiling
    105  * buffer pages are invalid.  On the sun3, request an ast to send us
    106  * through trap, marking the proc as needing a profiling tick.
    107  */
    108 #define	need_proftick(p)	((p)->p_flag |= P_OWEUPC, aston())
    109 
    110 /*
    111  * Notify the current process (p) that it has a signal pending,
    112  * process as soon as possible.
    113  */
    114 #define	signotify(p)	aston()
    115 
    116 /*
    117  * Software Interrupt Register (SIR)
    118  * The sun3 has a real software interrupt register set by
    119  * isr_soft_request() so this scheme just multiplexes four
    120  * software interrupt `sources' on the level one handler.
    121  */
    122 extern void isr_soft_request __P((int level));
    123 union sun3sir {
    124 	int 	sir_any;
    125 	char	sir_which[4];
    126 } sun3sir;
    127 
    128 #define SIR_NET  	0
    129 #define SIR_CLOCK	1
    130 #define SIR_SPARE2	2
    131 #define SIR_SPARE3	3
    132 
    133 #define	setsoftint(x)	isr_soft_request(x)
    134 #define setsoftnet()	(sun3sir.sir_which[SIR_NET] = 1, setsoftint(1))
    135 #define setsoftclock()	(sun3sir.sir_which[SIR_CLOCK] = 1, setsoftint(1))
    136 
    137 #endif	/* _KERNEL */
    138 
    139 #include <m68k/sysctl.h>
    140 #endif /* _CPU_H_ */
    141