2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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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.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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36 * from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
37 * $FreeBSD: src/sys/i386/include/cpu.h,v 1.43.2.2 2001/06/15 09:37:57 scottl Exp $
38 * $DragonFly: src/sys/i386/include/Attic/cpu.h,v 1.4 2003/06/20 02:09:54 dillon Exp $
41 #ifndef _MACHINE_CPU_H_
42 #define _MACHINE_CPU_H_
45 * Definitions unique to i386 cpu support.
47 #include <machine/psl.h>
48 #include <machine/frame.h>
49 #include <machine/segments.h>
52 * definitions of cpu-dependent requirements
53 * referenced in generic code
55 #undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
57 #define cpu_exec(p) /* nothing */
58 #define cpu_swapin(p) /* nothing */
59 #define cpu_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap))
61 #define CLKF_USERMODE(framep) \
62 ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
64 #define CLKF_INTR(framep) (intr_nesting_level >= 2)
67 * XXX splsoftclock() is very broken and barely worth fixing. It doesn't
68 * turn off the clock bit in imen or in the icu. (This is not a serious
69 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio. softclock()
70 * can take more than 62.5 usec so clock interrupts are lost.) It doesn't
71 * check for pending interrupts being unmasked. clkintr() and Xintr0()
72 * assume that the ipl is high when hardclock() returns. Our SWI_CLOCK
73 * handling is efficient enough that little is gained by calling
74 * softclock() directly.
76 #define CLKF_BASEPRI(framep) ((framep)->cf_ppl == 0)
78 #define CLKF_BASEPRI(framep) (0)
80 #define CLKF_PC(framep) ((framep)->cf_eip)
83 * Preempt the current process if in interrupt from user mode,
84 * or after the current trap/syscall if in system mode.
86 * XXX: if astpending is later changed to an |= here due to more flags being
87 * added, we will have an atomicy problem. The type of atomicy we need is
90 #define need_resched() do { mycpu->gd_astpending = AST_RESCHED|AST_PENDING; } while (0)
91 #define clear_resched() do { mycpu->gd_astpending &= ~AST_RESCHED; } while(0)
92 #define resched_wanted() (mycpu->gd_astpending & AST_RESCHED)
95 * Arrange to handle pending profiling ticks before returning to user mode.
97 * XXX this is now poorly named and implemented. It used to handle only a
98 * single tick and the P_OWEUPC flag served as a counter. Now there is a
99 * counter in the proc table and flag isn't really necessary.
101 #define need_proftick(p) \
102 do { (p)->p_flag |= P_OWEUPC; aston(); } while (0)
105 * Notify the current process (p) that it has a signal pending,
106 * process as soon as possible.
108 * XXX: aston() really needs to be an atomic (not locked, but an orl),
109 * in case need_resched() is set by an interrupt. But with astpending a
110 * per-cpu variable this is not trivial to do efficiently. For now we blow
111 * it off (asynchronous need_resched() conflicts are not critical).
113 #define signotify(p) aston()
115 #define aston() do { mycpu->gd_astpending |= AST_PENDING; } while (0)
119 * CTL_MACHDEP definitions.
121 #define CPU_CONSDEV 1 /* dev_t: console terminal device */
122 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
123 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */
124 #define CPU_BOOTINFO 4 /* struct: bootinfo */
125 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
126 #define CPU_MAXID 6 /* number of valid machdep ids */
128 #define CTL_MACHDEP_NAMES { \
130 { "console_device", CTLTYPE_STRUCT }, \
131 { "adjkerntz", CTLTYPE_INT }, \
132 { "disable_rtc_set", CTLTYPE_INT }, \
133 { "bootinfo", CTLTYPE_STRUCT }, \
134 { "wall_cmos_clock", CTLTYPE_INT }, \
140 extern u_char intr_nesting_level;
142 void fork_trampoline __P((void));
143 void fork_return __P((struct proc *, struct trapframe));
146 #endif /* !_MACHINE_CPU_H_ */