FreeBSD/Linux Kernel Cross Reference
sys/i386/include/cpu.h
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 * $FreeBSD: src/sys/i386/include/cpu.h,v 1.25.2.3 1999/09/05 08:11:43 peter Exp $
38 */
39
40 #ifndef _MACHINE_CPU_H_
41 #define _MACHINE_CPU_H_
42
43 /*
44 * Definitions unique to i386 cpu support.
45 */
46 #include <machine/frame.h>
47 #include <machine/segments.h>
48
49 /*
50 * Architecture dependent constant for i386 based machines.
51 */
52 #ifdef PC98
53 /* NEC PC-9801/9821 series and compatibles. */
54 #define MACHINE_ARCH "pc-98"
55 #else
56 /* IBM-PC compatibles. */
57 #define MACHINE_ARCH "ibm-pc"
58 #endif
59
60 /*
61 * definitions of cpu-dependent requirements
62 * referenced in generic code
63 */
64 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
65
66 #define cpu_exec(p) /* nothing */
67 #define cpu_swapin(p) /* nothing */
68 #define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap))
69 #define cpu_set_init_frame(p, fp) ((p)->p_md.md_regs = (fp))
70
71 #define CLKF_USERMODE(framep) (ISPL((framep)->cf_cs) == SEL_UPL)
72 #define CLKF_INTR(framep) (intr_nesting_level >= 2)
73 #if 0
74 /*
75 * XXX splsoftclock() is very broken and barely worth fixing. It doesn't
76 * turn off the clock bit in imen or in the icu. (This is not a serious
77 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock()
78 * can take more than 62.5 usec so clock interrupts are lost.) It doesn't
79 * check for pending interrupts being unmasked. clkintr() and Xintr0()
80 * assume that the ipl is high when hardclock() returns. Our SWI_AST
81 * handling is efficient enough that little is gained by calling
82 * softclock() directly.
83 */
84 #define CLKF_BASEPRI(framep) (((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
85 #else
86 #define CLKF_BASEPRI(framep) (0)
87 #endif
88 #define CLKF_PC(framep) ((framep)->cf_eip)
89
90 /*
91 * Preempt the current process if in interrupt from user mode,
92 * or after the current trap/syscall if in system mode.
93 */
94 #define need_resched() { want_resched = 1; aston(); }
95
96 /*
97 * Arrange to handle pending profiling ticks before returning to user mode.
98 *
99 * XXX this is now poorly named and implemented. It used to handle only a
100 * single tick and the P_OWEUPC flag served as a counter. Now there is a
101 * counter in the proc table and flag isn't really necessary.
102 */
103 #define need_proftick(p) { (p)->p_flag |= P_OWEUPC; aston(); }
104
105 /*
106 * Notify the current process (p) that it has a signal pending,
107 * process as soon as possible.
108 */
109 #define signotify(p) aston()
110
111 #define aston() setsoftast()
112 #define astoff()
113
114 /*
115 * pull in #defines for kinds of processors
116 */
117 #include <machine/cputypes.h>
118
119 struct cpu_nameclass {
120 char *cpu_name;
121 int cpu_class;
122 };
123
124 /*
125 * CTL_MACHDEP definitions.
126 */
127 #define CPU_CONSDEV 1 /* dev_t: console terminal device */
128 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
129 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */
130 #define CPU_BOOTINFO 4 /* struct: bootinfo */
131 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
132 #define CPU_MAXID 6 /* number of valid machdep ids */
133
134 #define CTL_MACHDEP_NAMES { \
135 { 0, 0 }, \
136 { "console_device", CTLTYPE_STRUCT }, \
137 { "adjkerntz", CTLTYPE_INT }, \
138 { "disable_rtc_set", CTLTYPE_INT }, \
139 { "bootinfo", CTLTYPE_STRUCT }, \
140 { "wall_cmos_clock", CTLTYPE_INT }, \
141 }
142
143 #ifdef KERNEL
144 extern int cpu;
145 extern int cpu_class;
146 extern u_char intr_nesting_level;
147 extern int want_resched; /* resched was called */
148 #endif
149
150 #endif /* !_MACHINE_CPU_H_ */
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