The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/cpu.h

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    1 /*      $NetBSD: cpu.h,v 1.23.4.3 2009/02/02 03:19:32 snj Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 2007 YAMAMOTO Takashi,
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #ifndef _SYS_CPU_H_
   30 #define _SYS_CPU_H_
   31 
   32 #ifndef _LOCORE
   33 
   34 #include <machine/cpu.h>
   35 
   36 #include <sys/lwp.h>
   37 
   38 struct cpu_info;
   39 
   40 #ifndef cpu_idle
   41 void cpu_idle(void);
   42 #endif
   43 
   44 /*
   45  * cpu_need_resched() must always be called with the target CPU
   46  * locked (via spc_lock() or another route), unless called locally.
   47  * If called locally, the caller need only be at IPL_SCHED.
   48  */
   49 #ifndef cpu_need_resched
   50 void cpu_need_resched(struct cpu_info *, int);
   51 #endif
   52 
   53 #ifndef cpu_did_resched
   54 #define cpu_did_resched(l)      /* nothing */
   55 #endif
   56 
   57 #ifndef CPU_INFO_ITERATOR
   58 #define CPU_INFO_ITERATOR               int
   59 #define CPU_INFO_FOREACH(cii, ci)       \
   60     (void)cii, ci = curcpu(); ci != NULL; ci = NULL
   61 #endif
   62 
   63 #ifndef CPU_IS_PRIMARY
   64 #define CPU_IS_PRIMARY(ci)      ((void)ci, 1)
   65 #endif
   66 
   67 #ifdef __HAVE_MD_CPU_OFFLINE
   68 void    cpu_offline_md(void);
   69 #endif
   70 
   71 lwp_t   *cpu_switchto(lwp_t *, lwp_t *, bool);
   72 struct  cpu_info *cpu_lookup(u_int);
   73 int     cpu_setstate(struct cpu_info *, bool);
   74 bool    cpu_intr_p(void);
   75 bool    cpu_kpreempt_enter(uintptr_t, int);
   76 void    cpu_kpreempt_exit(uintptr_t);
   77 bool    cpu_kpreempt_disabled(void);
   78 
   79 CIRCLEQ_HEAD(cpuqueue, cpu_info);
   80 
   81 extern kmutex_t cpu_lock;
   82 extern u_int maxcpus;
   83 extern struct cpuqueue cpu_queue;
   84   
   85 static inline u_int
   86 cpu_index(struct cpu_info *ci)
   87 {
   88         return ci->ci_index;
   89 }
   90 
   91 #endif  /* !_LOCORE */
   92 
   93 /* flags for cpu_need_resched */
   94 #define RESCHED_LAZY            0x01
   95 #define RESCHED_IMMED           0x02
   96 #define RESCHED_KPREEMPT        0x04
   97 
   98 #endif  /* !_SYS_CPU_H_ */

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