FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/pcpu_aux.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2019 The FreeBSD Foundation
      *
      * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
      * under sponsorship from the FreeBSD Foundation.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifdef __i386__
    #include <i386/pcpu_aux.h>
    #else /* !__i386__ */
    
    #ifndef _MACHINE_PCPU_AUX_H_
    #define _MACHINE_PCPU_AUX_H_
    
    #ifndef _KERNEL
    #error "Not for userspace"
    #endif
    
    #ifndef _SYS_PCPU_H_
    #error "Do not include machine/pcpu_aux.h directly"
    #endif
    
    /* Required for counters(9) to work on x86. */
    _Static_assert(sizeof(struct pcpu) == UMA_PCPU_ALLOC_SIZE, "fix pcpu size");
    
    extern struct pcpu *__pcpu;
    extern struct pcpu temp_bsp_pcpu;
    
    static __inline __pure2 struct thread *
    __curthread(void)
    {
            struct thread *td;
    
            __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcpu,
                pc_curthread)));
            return (td);
    }
    #define curthread               (__curthread())
    #define curpcb                  (&curthread->td_md.md_pcb)
    
    #endif  /* _MACHINE_PCPU_AUX_H_ */
    
    #endif /* __i386__ */

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