FreeBSD/Linux Kernel Cross Reference
sys/arm/include/tls.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
      * All rights reserved.
      *
      * 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 ``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 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.
     */
    
    #ifndef _MACHINE_TLS_H_
    #define _MACHINE_TLS_H_
    
    #include <sys/_tls_variant_i.h>
    #include <machine/sysarch.h>
    
    #define TLS_DTV_OFFSET  0
    #define TLS_TCB_ALIGN   8
    #define TLS_TP_OFFSET   0
    
    static __inline void
    _tcb_set(struct tcb *tcb)
    {
    #ifdef ARM_TP_ADDRESS
            *((struct tcb **)ARM_TP_ADDRESS) = tcb; /* avoids a system call */
    #else
            sysarch(ARM_SET_TP, tcb);
    #endif
    }
    
    static __inline struct tcb *
    _tcb_get(void)
    {
    #ifdef ARM_TP_ADDRESS
            return (*((struct tcb **)ARM_TP_ADDRESS));
    #else
            struct tcb *tcb;
    
            __asm __volatile("mrc  p15, 0, %0, c13, c0, 3"          \
                             : "=r" (tcb));
            return (tcb);
    #endif
    }
    
    #endif /* !_MACHINE_TLS_H_ */

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