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.
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.
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
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/cpu/i386/include/cpu.h,v 1.15 2004/03/30 19:14:06 dillon Exp $
41 #ifndef _MACHINE_CPU_H_
42 #define _MACHINE_CPU_H_
45 * Definitions unique to i386 cpu support.
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)->if_cs) == SEL_UPL) || (framep->if_eflags & PSL_VM))
64 #define CLKF_INTR(framep) (mycpu->gd_intr_nesting_level > 1 || (curthread->td_flags & TDF_INTTHREAD))
65 #define CLKF_PC(framep) ((framep)->if_eip)
68 * Preempt the current process if in interrupt from user mode,
69 * or after the current trap/syscall if in system mode.
71 * We do not have to use a locked bus cycle but we do have to use an
72 * atomic instruction because an interrupt on the local cpu can modify
73 * the gd_reqflags field.
75 #define need_lwkt_resched() \
76 atomic_set_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_LWKT_RESCHED)
77 #define need_user_resched() \
78 atomic_set_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_USER_RESCHED)
79 #define need_proftick() \
80 atomic_set_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_OWEUPC)
82 atomic_set_int_nonlocked(&mycpu->gd_reqflags, RQF_IPIQ)
84 atomic_set_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_SIGNAL)
86 atomic_set_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_UPCALL)
87 #define clear_user_resched() \
88 atomic_clear_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_USER_RESCHED)
89 #define clear_lwkt_resched() \
90 atomic_clear_int_nonlocked(&mycpu->gd_reqflags, RQF_AST_LWKT_RESCHED)
91 #define user_resched_wanted() \
92 (mycpu->gd_reqflags & RQF_AST_USER_RESCHED)
93 #define lwkt_resched_wanted() \
94 (mycpu->gd_reqflags & RQF_AST_LWKT_RESCHED)
95 #define any_resched_wanted() \
96 (mycpu->gd_reqflags & (RQF_AST_LWKT_RESCHED|RQF_AST_USER_RESCHED))
99 * CTL_MACHDEP definitions.
101 #define CPU_CONSDEV 1 /* dev_t: console terminal device */
102 #define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
103 #define CPU_DISRTCSET 3 /* int: disable resettodr() call */
104 #define CPU_BOOTINFO 4 /* struct: bootinfo */
105 #define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
106 #define CPU_MAXID 6 /* number of valid machdep ids */
108 #define CTL_MACHDEP_NAMES { \
110 { "console_device", CTLTYPE_STRUCT }, \
111 { "adjkerntz", CTLTYPE_INT }, \
112 { "disable_rtc_set", CTLTYPE_INT }, \
113 { "bootinfo", CTLTYPE_STRUCT }, \
114 { "wall_cmos_clock", CTLTYPE_INT }, \
121 void fork_trampoline (void);
122 void fork_return (struct proc *, struct trapframe);
125 #endif /* !_MACHINE_CPU_H_ */