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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
   35  * $FreeBSD: releng/12.0/sys/i386/include/cpu.h 340269 2018-11-08 22:39:38Z jhb $
   36  */
   37 
   38 #ifndef _MACHINE_CPU_H_
   39 #define _MACHINE_CPU_H_
   40 
   41 /*
   42  * Definitions unique to i386 cpu support.
   43  */
   44 #include <machine/psl.h>
   45 #include <machine/frame.h>
   46 #include <machine/segments.h>
   47 
   48 #define cpu_exec(p)     /* nothing */
   49 #define cpu_swapin(p)   /* nothing */
   50 #define cpu_getstack(td)                ((td)->td_frame->tf_esp)
   51 #define cpu_setstack(td, ap)            ((td)->td_frame->tf_esp = (ap))
   52 #define cpu_spinwait()                  ia32_pause()
   53 
   54 #define TRAPF_USERMODE(framep) \
   55         ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
   56 #define TRAPF_PC(framep)        ((framep)->tf_eip)
   57 
   58 #ifdef _KERNEL
   59 /*
   60  * Struct containing pointers to CPU management functions whose
   61  * implementation is run time selectable.  Selection can be made,
   62  * for example, based on detection of a particular CPU variant or
   63  * hypervisor environment.
   64  */
   65 struct cpu_ops {
   66         void (*cpu_init)(void);
   67         void (*cpu_resume)(void);
   68 };
   69 
   70 extern struct   cpu_ops cpu_ops;
   71 extern char     btext[];
   72 extern char     etext[];
   73 
   74 void    cpu_halt(void);
   75 void    cpu_lock_delay(void);
   76 void    cpu_reset(void);
   77 void    fork_trampoline(void);
   78 void    swi_vm(void *);
   79 
   80 /*
   81  * Return contents of in-cpu fast counter as a sort of "bogo-time"
   82  * for random-harvesting purposes.
   83  */
   84 static __inline uint64_t
   85 get_cyclecount(void)
   86 {
   87 
   88         return (cpu_ticks());
   89 }
   90 
   91 #endif
   92 
   93 #endif /* !_MACHINE_CPU_H_ */

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