FreeBSD/Linux Kernel Cross Reference
sys/i386/include/cpu.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_CPU_H_
    #define _MACHINE_CPU_H_
    
    /*
     * Definitions unique to i386 cpu support.
     */
    #ifdef _KERNEL
    #include <sys/systm.h>                  /* For cpu_ticks(). */
    #endif
    #include <machine/psl.h>
    #include <machine/frame.h>
    #include <machine/segments.h>
    
    #define cpu_exec(p)     /* nothing */
    #define cpu_swapin(p)   /* nothing */
    #define cpu_getstack(td)                ((td)->td_frame->tf_esp)
    #define cpu_setstack(td, ap)            ((td)->td_frame->tf_esp = (ap))
    #define cpu_spinwait()                  ia32_pause()
    
    #define TRAPF_USERMODE(framep) \
            ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
    #define TRAPF_PC(framep)        ((framep)->tf_eip)
    
    #ifdef _KERNEL
    /*
     * Struct containing pointers to CPU management functions whose
     * implementation is run time selectable.  Selection can be made,
     * for example, based on detection of a particular CPU variant or
     * hypervisor environment.
     */
    struct cpu_ops {
            void (*cpu_init)(void);
            void (*cpu_resume)(void);
    };
    
    extern struct   cpu_ops cpu_ops;
    extern char     btext[];
    extern char     etext[];
    
    void    cpu_halt(void);
    void    cpu_lock_delay(void);
    void    cpu_reset(void);
    void    fork_trampoline(void);
    
    /*
     * Return contents of in-cpu fast counter as a sort of "bogo-time"
     * for random-harvesting purposes.
     */
    static __inline uint64_t
    get_cyclecount(void)
    {
    
            return (cpu_ticks());
    }
    
    #endif
    
    #endif /* !_MACHINE_CPU_H_ */

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