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/i386/include/cpu.h

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    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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
   33  * $FreeBSD: stable/10/sys/i386/include/cpu.h 255744 2013-09-20 22:59:22Z gibbs $
   34  */
   35 
   36 #ifndef _MACHINE_CPU_H_
   37 #define _MACHINE_CPU_H_
   38 
   39 /*
   40  * Definitions unique to i386 cpu support.
   41  */
   42 #include <machine/psl.h>
   43 #include <machine/frame.h>
   44 #include <machine/segments.h>
   45 
   46 #define cpu_exec(p)     /* nothing */
   47 #define cpu_swapin(p)   /* nothing */
   48 #define cpu_getstack(td)                ((td)->td_frame->tf_esp)
   49 #define cpu_setstack(td, ap)            ((td)->td_frame->tf_esp = (ap))
   50 #define cpu_spinwait()                  ia32_pause()
   51 
   52 #define TRAPF_USERMODE(framep) \
   53         ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
   54 #define TRAPF_PC(framep)        ((framep)->tf_eip)
   55 
   56 #ifdef _KERNEL
   57 /*
   58  * Struct containing pointers to CPU management functions whose
   59  * implementation is run time selectable.  Selection can be made,
   60  * for example, based on detection of a particular CPU variant or
   61  * hypervisor environment.
   62  */
   63 struct cpu_ops {
   64         void (*cpu_init)(void);
   65         void (*cpu_resume)(void);
   66         void (*ipi_vectored)(u_int, int);
   67 };
   68 
   69 extern struct   cpu_ops cpu_ops;
   70 extern char     btext[];
   71 extern char     etext[];
   72 
   73 void    cpu_halt(void);
   74 void    cpu_reset(void);
   75 void    fork_trampoline(void);
   76 void    swi_vm(void *);
   77 
   78 /*
   79  * Return contents of in-cpu fast counter as a sort of "bogo-time"
   80  * for random-harvesting purposes.
   81  */
   82 static __inline uint64_t
   83 get_cyclecount(void)
   84 {
   85 
   86         return (cpu_ticks());
   87 }
   88 
   89 #endif
   90 
   91 #endif /* !_MACHINE_CPU_H_ */

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