cpu.h revision 5 
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 */
68typedef 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
97int	astpending;		/* need to trap before returning to user mode */
98int	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