FreeBSD/Linux Kernel Cross Reference
sys/riscv/include/pcpu.h

     /*-
      * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
      * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Portions of this software were developed by SRI International and the
      * University of Cambridge Computer Laboratory under DARPA/AFRL contract
      * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
      *
     * Portions of this software were developed by the University of Cambridge
     * Computer Laboratory as part of the CTSRD Project, with support from the
     * UK Higher Education Innovation Fund (HEIF).
     *
     * 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.
     *
     *      from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_PCPU_H_
    #define _MACHINE_PCPU_H_
    
    #include <machine/cpu.h>
    #include <machine/cpufunc.h>
    
    #define ALT_STACK_SIZE  128
    
    /* Keep in sync with db_show_mdpcpu() */
    #define PCPU_MD_FIELDS                                                  \
            struct pmap *pc_curpmap;        /* Currently active pmap */     \
            uint32_t pc_pending_ipis;       /* IPIs pending to this CPU */  \
            uint32_t pc_hart;               /* Hart ID */                   \
            char __pad[56]                  /* Pad to factor of PAGE_SIZE */
    
    #ifdef _KERNEL
    
    struct pcb;
    struct pcpu;
    
    static inline struct pcpu *
    get_pcpu(void)
    {
            struct pcpu *pcpu;
    
            __asm __volatile("mv %0, tp" : "=&r"(pcpu));
    
            return (pcpu);
    }
    
    static inline struct thread *
    get_curthread(void)
    {
            struct thread *td;
    
            __asm __volatile("ld %0, 0(tp)" : "=&r"(td));
    
            return (td);
    }
    
    #define curthread get_curthread()
    
    #define PCPU_GET(member)        (get_pcpu()->pc_ ## member)
    #define PCPU_ADD(member, value) (get_pcpu()->pc_ ## member += (value))
    #define PCPU_PTR(member)        (&get_pcpu()->pc_ ## member)
    #define PCPU_SET(member,value)  (get_pcpu()->pc_ ## member = (value))
    
    #endif  /* _KERNEL */
    
    #endif  /* !_MACHINE_PCPU_H_ */

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