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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright 2004 by Peter Grehan. 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.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * 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>
    
    #define TLS_DTV_OFFSET  0x8000
    #define TLS_TCB_ALIGN   TLS_TCB_SIZE
    #define TLS_TP_OFFSET   0x7000
    
    static __inline void
    _tcb_set(struct tcb *tcb)
    {
    #ifdef __powerpc64__
            __asm __volatile("mr 13,%0" ::
                "r" ((uint8_t *)tcb + TLS_TP_OFFSET + TLS_TCB_SIZE));
    #else
            __asm __volatile("mr 2,%0" ::
                "r" ((uint8_t *)tcb + TLS_TP_OFFSET + TLS_TCB_SIZE));
    #endif
    }
    
    static __inline struct tcb *
    _tcb_get(void)
    {
            struct tcb *tcb;
    
    #ifdef __powerpc64__
            __asm __volatile("addi %0,13,%1" : "=r" (tcb) :
                "i" (-(TLS_TP_OFFSET + TLS_TCB_SIZE)));
    #else
            __asm __volatile("addi %0,2,%1" : "=r" (tcb) :
                "i" (-(TLS_TP_OFFSET + TLS_TCB_SIZE)));
    #endif
            return (tcb);
    }
    
    #endif /* !_MACHINE_TLS_H_ */

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