cpu.h revision 719 
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 1.3 1993/10/08 20:50:57 rgrimes Exp $
38 */
39
40#ifndef _MACHINE_CPU_H_
41#define _MACHINE_CPU_H_ 1
42
43/*
44 * Definitions unique to i386 cpu support.
45 */
46#include "machine/frame.h"
47#include "machine/segments.h"
48
49/*
50 * definitions of cpu-dependent requirements
51 * referenced in generic code
52 */
53#undef	COPY_SIGCODE		/* don't copy sigcode above user stack in exec */
54
55#define	cpu_exec(p)	/* nothing */
56
57/*
58 * Arguments to hardclock, softclock and gatherstats
59 * encapsulate the previous machine state in an opaque
60 * clockframe; for now, use generic intrframe.
61 */
62typedef 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
68/*
69 * Preempt the current process if in interrupt from user mode,
70 * or after the current trap/syscall if in system mode.
71 */
72#define	need_resched()	{ want_resched++; aston(); }
73
74/*
75 * Give a profiling tick to the current process from the softclock
76 * interrupt.  On tahoe, request an ast to send us through trap(),
77 * marking the proc as needing a profiling tick.
78 */
79#define	profile_tick(p, framep)	{ (p)->p_flag |= SOWEUPC; aston(); }
80
81/*
82 * Notify the current process (p) that it has a signal pending,
83 * process as soon as possible.
84 */
85#define	signotify(p)	aston()
86
87#define aston() (astpending++)
88
89/*
90 * pull in #defines for kinds of processors
91 */
92#include "machine/cputypes.h"
93
94struct cpu_nameclass {
95	char *cpu_name;
96	int  cpu_class;
97};
98
99#ifdef KERNEL
100extern int astpending;		/* want a trap before returning to user mode */
101extern int want_resched;	/* resched was called */
102
103extern int cpu;
104extern int cpu_class;
105extern struct cpu_nameclass i386_cpus[];
106#endif
107#endif /* _MACHINE_CPU_H_ */
108